CN116262052A - Traction rings, sheaths and interventional instruments - Google Patents

Abstract

The invention discloses a traction ring, a sheath tube and an interventional instrument, wherein the traction ring is used for connecting a traction wire and comprises a ring body, the ring body is provided with a proximal ring surface and a distal ring surface which are opposite to each other, and two opposite peripheral walls positioned between the proximal ring surface and the distal ring surface, a first accommodating groove is concavely formed in one peripheral wall of the ring body, an accommodating channel communicated with the first accommodating groove is concavely formed in the proximal ring surface of the ring body, a hooking part for hooking the traction wire is formed in the first accommodating groove, and the traction wire placed in the first accommodating groove penetrates through the accommodating channel after being hooked on the hooking part. In the traction ring, the sheath tube and the interventional instrument, the traction wire is hooked on the hooking part and then is in surface contact with the hooking part, so that the reliability is ensured; meanwhile, the traction wire is led out from the accommodating channel on the ring body after being arranged in the first accommodating groove, so that at least part of the traction wire is accommodated in the ring body, the thickness of the whole structure is effectively reduced, and the thin-wall design is realized.

Description

Traction rings, sheaths and interventional instruments

technical field

The invention relates to the technical field of interventional medical devices, in particular to a traction ring, a sheath and an interventional device.

Background technique

Medical sheaths are used in minimally invasive interventional diagnosis and treatment operations to establish channels, transport or recover instruments, infuse drugs or export body fluids, etc.; the adjustable curved sheath has a distal adjustable bending function, which can quickly and reliably reach the Target lesion location to reduce operation time. In order to accurately adjust the angle of the distal end of the tube body before and during the operation, the doctor will perform repeated bending operations to adapt the bending angle to the complex anatomical structure of different human lumens. Therefore, this requires adjustable bending The traction system of the sheath has good traction fatigue performance. The tensile strength of the traction system, the tensile fatigue strength and the effect on the wall thickness of the tube body are critical in adjustable curved sheaths.

Referring to Fig. 1, in the existing traction system, the traction wire 20' is folded in half and placed on the fixed ring 10', and the traction wire 20' acts on the fixed ring 10' after being pulled, which is a "point" force, so It is easy to break the fixing ring or the double fold of the pulling wire, and the reliability is lacking. For this reason, someone proposes another connection method based on it. Referring to FIG. 2, the drawing wire 20" is connected through the hole on the fixing ring 10". Although this connection method has certain reliability, However, the thickness of the overall structure is greater than that of the fixing ring, which will lead to an increase in the wall thickness of the sheath tube body.

Contents of the invention

The technical problem to be solved by the present invention is to provide a traction ring, a sheath and an interventional instrument that can not only ensure reliability but also be thin-walled in view of the above-mentioned defects in the prior art.

The technical solution adopted by the present invention to solve its technical problems is:

A traction ring is provided for connecting a traction wire, comprising a ring body, the ring body has a proximal ring surface and a distal ring surface opposite to each other, and a ring located between the proximal ring surface and the distal ring surface Two opposite peripheral walls between the ring body, one of the peripheral walls of the ring body is recessed with a first accommodation groove, and the proximal ring surface of the ring body is concavely provided with an accommodation channel communicating with the first accommodation groove, so A hooking portion for hooking the pulling wire is formed in the first accommodation groove, and the pulling wire placed in the first accommodation groove is hooked on the hooking portion and passes through the accommodation channel.

In one of the embodiments, the accommodating channel is a second accommodating groove that runs through the other peripheral wall of the ring body, and the ring body is also provided with a channel connecting the first accommodating groove and the second accommodating groove. through the hole, the pulling wire placed in the first receiving groove is hooked on the hooking part, passes through the through hole, and then enters the second receiving groove.

In one embodiment, the first receiving groove and the second receiving groove overlap axially to form the through hole through which the pulling wire can pass.

In one of the embodiments, the second accommodating groove is an arc-shaped groove formed by recessing.

In one embodiment, the first accommodating groove is partially disposed on the peripheral wall of the ring body, and the hooking portion includes a protrusion formed in the first accommodating groove.

In one of the embodiments, the surface of the projection where the hooking wire is hooked is an arc surface.

In one of the embodiments, the top of the protruding block is provided with a concave portion for limiting the pulling wire hooked on it, and/or, the protruding block is far away from the bottom of the first receiving groove One side surface of the wall extends axially to form a blocking portion for limiting the pulling wire hooked thereon.

In one of the embodiments, a first receiving groove, a receiving channel and a protrusion form a set of traction structures, and multiple sets of the traction structures are arranged at intervals along the circumferential direction of the ring body.

In one of the embodiments, the first accommodating groove is arranged circumferentially on the outer peripheral wall of the ring body, so that the formed first accommodating groove is an annular groove, and the annular wall of the annular groove forms the Describe the hooking part.

In one of the embodiments, the surface at the intersection of the first receiving groove and the receiving channel which is in contact with the pulling wire is an arc surface.

In one of the embodiments, the accommodating channel includes a first sub-channel and a second sub-channel arranged at intervals in the circumferential direction, and both the first sub-channel and the second sub-channel communicate with the first accommodating groove; in,

When the accommodating channel is a second accommodating groove formed through the other peripheral wall of the ring body, the first sub-channel and the second sub-channel are respectively first sub-channels communicating with the first accommodating groove The accommodation tank and the second sub-accommodation tank; wherein,

When the first receiving groove and the second receiving groove axially overlap to form the through hole through which the pulling wire can pass, the first sub-accommodating groove and the second sub-accommodating groove are respectively connected to the second receiving groove The first receiving groove overlaps axially to form a first through hole and a second through hole through which the two ends of the pulling wire can respectively pass; wherein,

When the second receiving groove is an arc-shaped groove formed by recessing, the first sub-accommodating groove and the second sub-accommodating groove are respectively a first arc-shaped groove and a second arc-shaped groove formed by recessing groove.

In one of the embodiments, when the hooking portion includes a protrusion formed in the first receiving groove, the protrusion is interposed between the first sub-channel and the second sub-channel .

Another technical solution adopted by the present invention to solve its technical problems is:

A sheath tube is provided, including a tubular body, a traction ring as described above and a traction wire arranged on the tubular body, a traction channel communicated with the accommodating channel of the traction ring is provided in the tubular body, and from the The drawing wire passing through the accommodation channel enters the accommodation channel.

Another technical solution adopted by the present invention to solve its technical problems is:

An interventional instrument is provided, which is characterized in that it comprises the above-mentioned sheath tube, a handle connected to the proximal end of the sheath tube, and a bending adjustment mechanism arranged in the handle, and the pulling wire entering the accommodating channel is automatically After passing through, the traction channel is connected with the bending adjustment mechanism.

In summary, in the traction ring, sheath and interventional instrument of the present invention, the traction wire is hooked on the hook part and forms surface contact with the hook part, which ensures reliability; at the same time, the traction wire is placed in the first storage After being inside the groove, it is led out from the accommodation channel on the ring body, which makes at least part of the pulling wire accommodated in the ring body, effectively reducing the thickness of the overall structure and realizing a thin-walled design. So that on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube and transport larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube , the sheath can be used in smaller vessels.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a kind of fixing method of pulling wire and pulling ring in the existing pulling system;

Fig. 2 is another kind of fixing method of pulling wire and pulling ring in the existing pulling system;

Fig. 3 is a schematic diagram of the external structure of an embodiment of the exemplary traction ring of the present invention;

Fig. 4 is a schematic diagram of the internal structure of the traction ring shown in Fig. 3;

Fig. 5 is a schematic diagram of the structure of the drawing wire connected to the drawing ring shown in Fig. 3;

Fig. 6 is a schematic top view of the traction ring shown in Fig. 3;

Fig. 7 is a schematic diagram of perforations formed on the traction ring shown in Fig. 3;

Fig. 8 is a schematic diagram of the drawing wire passing through the perforation on the drawing ring shown in Fig. 3;

Fig. 9 is a schematic structural view of a sheath including the traction ring shown in Fig. 3;

Fig. 10 is a schematic diagram of the external structure of another embodiment of the exemplary traction ring of the present invention;

Fig. 11 is a schematic diagram of the internal structure of the traction ring shown in Fig. 10;

Fig. 12 is a schematic structural view of a sheath including the traction ring shown in Fig. 10 .

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, it should be noted that in the field of interventional medical devices, the end of the medical device implanted in the human body or animal body or the delivery system that transports the medical device that is closer to the operator is generally referred to as the "proximal end", and the distance from the operator The far end is called the "distal end", and according to this principle, the "proximal end" and "distal end" of any part of the medical device or delivery system are defined. "Axial" generally refers to the length direction of the medical device when it is being transported, and "radial" generally refers to the direction perpendicular to the "axial" of the medical device, and the "axis" of any part of the medical device is defined according to this principle to" and "radial".

Example 1

3 and 10, the present invention exemplarily provides a traction ring 100 for connecting a traction wire 200, the traction ring 100 includes a ring body 10, and the ring body 10 has an opposite proximal ring surface 10a and a distal ring surface 10a. The end ring surface 10b, and two opposite peripheral walls located between the proximal ring surface 10a and the distal ring surface 10b, one of the peripheral walls of the ring body 10 is recessed with a first receiving groove, and the proximal ring surface of the ring body 10 10a is concavely provided with an accommodating passage communicating with the first accommodating groove, wherein the communication here may refer to direct communication or indirect communication. A hooking portion for hooking the pulling wire 200 is formed in the first receiving groove, and the pulling wire 200 placed in the first receiving groove is hooked on the hooking portion and then passed through and drawn out from the containing channel. The drawing wire 200 is hooked on the hooking part and forms surface contact with the hooking part, which ensures reliability; at the same time, the drawing wire 200 is placed in the concave first receiving groove and drawn out from the receiving channel on the ring body 10, This makes at least part of the pulling wire 200 accommodated in the ring body 10, which effectively reduces the thickness of the overall structure and realizes a thin-wall design. It should be noted that the pulling wire 200 placed in the first accommodation groove shown in this embodiment is hooked on the hooking part and then drawn out from the accommodation channel is only to illustrate an implementation mode of the hooking process, and should not It is to limit the structure of the exemplary traction ring 100 of the present invention. For example, the hooking method can also be realized by passing an extended end of the traction wire 200 out of the accommodation passage through the hooking part in the first accommodation groove, After being hooked on the hooking part, it is folded back and passed through the accommodating channel. In this process, the hooking and passing through the accommodating channel can still be realized.

Further, since the channel perforation in the axial direction of the ring body 10 is highly demanding and difficult, and the overall strength of the ring body 10 is weak after the channel perforation is set, in view of this, in other embodiments, The accommodating channel is a second accommodating groove that runs through the other peripheral wall of the ring body. The ring body 10 is also provided with a perforation in the radial thickness direction that communicates with the first accommodating groove and the second accommodating groove. The pulling wire placed in the first accommodating groove After being hooked on the hooking part, it passes through the perforation and then enters the second receiving groove. In this embodiment, the accommodating channel is set as the second accommodating groove that runs through the other peripheral wall of the ring body, and connects the first accommodating groove and the second accommodating groove through a radial perforation, so that the pulling wire placed in the first accommodating groove is bent After passing through the perforation, it enters the second accommodating groove, and at least part of the two sides of the pulling wire are respectively placed in the first accommodating groove and the second accommodating groove, which is not only more conducive to realizing the thin-walled design of the ring body, but also ensures that there is no accommodating The overall strength of the traction ring of the channel, while greatly reducing the difficulty of the process.

In other embodiments, as an implementation manner of realizing the above-mentioned perforation, the first receiving groove and the second receiving groove axially overlap to form a perforation through which the pulling wire can pass. The perforation is set in this way, on the one hand, it simplifies the process of setting the perforation, and on the other hand, the recess depths of the first accommodation groove and the second accommodation groove overlap in the radial direction, so that more volumes of pulling wires can be accommodated inside, so that Further realization of thin-wall design.

Referring to Figure 4, preferably, since the second accommodation groove is also recessed, in order to avoid the weakening of the local strength of the ring due to the recessed second accommodation groove, at the same time ensure that the second accommodation groove has more accommodating volume, the second receiving groove is an arc-shaped groove formed by a concave design.

Exemplarily, the accommodating channel includes a first sub-channel and a second sub-channel arranged at intervals in the circumferential direction, and both the first sub-channel and the second sub-channel communicate with the first accommodating groove; When the second accommodation groove formed by the peripheral wall, the first sub-channel and the second sub-channel are respectively the first sub-accommodation groove and the second sub-accommodation groove communicated with the first accommodation groove; wherein, between the first accommodation groove and the second When the accommodating grooves are axially overlapped to form perforations through which the pulling wires can pass, the first sub-accommodating grooves and the second sub-accommodating grooves overlap with the first accommodating grooves in the axial direction respectively to form holes for the two ends of the pulling wires to pass through respectively. The first perforation and the second perforation; wherein, when the second accommodating groove is an arc-shaped groove formed by a concave design, the first sub-accommodating groove and the second sub-accommodating groove are respectively first arc-shaped grooves formed by a concave design and the second arc groove.

Example 2

On the basis of the traction ring 100 provided in the above-mentioned embodiment 1, the present invention exemplarily provides a sheath tube, the sheath tube includes a tubular body, the traction ring 100 as described in the first embodiment and a traction wire arranged on the tubular body 200, a traction channel communicating with the accommodation channel of the traction ring 100 is provided in the tube body, and the traction wire 200 passing through the accommodation channel enters the accommodation channel. The traction ring 100 described in Embodiment 1 is selected so that on the premise that the sheath tube has the same outer diameter, the present invention can achieve a larger inner diameter of the sheath tube and transport larger-sized instruments; or on the premise that the sheath tube has the same inner diameter, The invention can achieve a smaller outer diameter of the sheath, and the sheath can be used in smaller blood vessels.

Example 3

On the basis of the traction ring provided in the above-mentioned embodiment 1 and the sheath tube provided in the embodiment 2, the present invention exemplarily provides an interventional device, the interventional device includes the sheath tube as in the embodiment 2, the sheath connected to the proximal end of the sheath The handle and the bending adjustment mechanism arranged in the handle, the pulling wire 200 entering the accommodating channel is connected with the bending adjusting mechanism after passing through the pulling channel, and the bending adjusting mechanism moves under the drive of external force to pull and release the pulling wire 200, thereby Achieving a bend in the sheath.

Example 4

In this embodiment, a specific implementation manner of the traction ring 100 is proposed on the basis of the traction ring 100 provided in the first embodiment above. Specifically, as shown in FIG. 3 , the first accommodation groove of this embodiment is partially provided on the peripheral wall of the ring body 10 to form a partial first accommodation groove 21 , and the hooking portion includes a protrusion formed in the first accommodation groove. Block 41. That is to say, the protrusion 41 is formed in the partial first accommodation groove 21, and the proximal ring surface 10a of the ring body 10 is concavely provided with an accommodation channel communicating with the partial first accommodation groove 21, where the communication refers to direct communication or Indirect communication, the pulling wire 200 placed in the partial first receiving groove 21 is hooked on the hooking part and passes through the receiving channel.

Wherein, the ring body 10 has opposite first and second peripheral walls located between the proximal annular surface 10a and the distal annular surface 10b. When the first peripheral wall is an inner peripheral wall, the second peripheral wall is an outer peripheral wall; when the first peripheral wall is an outer peripheral wall, the second peripheral wall is an inner peripheral wall. It can be understood that in this embodiment, in terms of realizing the bending adjustment function, the partial first accommodation groove 21 can be provided on the first peripheral wall or the second peripheral wall of the ring body 10, that is, the partial first accommodation groove 21 can be arranged on the The inner peripheral wall can also be arranged on the outer peripheral wall, which can be selected according to needs. In this embodiment, in order to facilitate the setting of the groove and the hooking portion, as shown in FIG. 3 , a partial first receiving groove 21 is provided on the outer peripheral wall of the ring body 10 . It should also be understood that the distal end of the partial first receiving groove 21 may or may not pass through the distal annulus 10b of the ring body 10, as long as the pulling wire 200 can be placed in the local first It only needs to be accommodated in the groove 21 and hooked on the protrusion 41 .

Continuing to refer to Fig. 3, in order to better adapt to the flexible shape of the traction wire 200, and to increase the stress area, the surface of the projection 41 where it is hooked with the traction wire 200 is an arc surface, that is, the convex surface in Fig. 3 The top of the block 41 is arc-shaped. Compared with the angular contact mode, the arc-shaped contact surface can more effectively reduce wear, reduce the failure risk of the drawing wire and the fixing ring, and make the connection between the drawing wire and the fixing ring more reliable.

Further, in order to prevent the pulling wire 200 hooked on the bump 41 from detaching from the bump 41, as an anti-loosening implementation, the top of the bump 41 is provided with a pull wire 200 hooked on it. The recessed portion 41a for positioning. As another anti-loosening implementation manner, a side surface of the protrusion 41 away from the bottom wall of the first receiving groove extends axially to form a blocking portion 41b for limiting the pulling wire 200 hooked thereon. It is also possible that, in other embodiments, the above two anti-loosening methods can be combined, that is, both the recessed part 41a and the blocking part 41b are provided. Both the recessed part 41a and the blocking part 41b radially limit the pulling wire hooked on the protruding block 41 , avoiding its detachment failure and ensuring the reliability of the hooking.

As an implementation of the accommodating channel in this embodiment, the accommodating channel is a through hole formed in the ring body 10 recessed from the proximal ring surface 10a of the ring body 10, and the through hole communicates with the local first accommodating groove 21 , the communication here may refer to direct communication or indirect communication, and the pulling wire 200 placed in the partial first receiving groove 21 is hooked on the hooking part and passes through the through hole. Note that the through hole formed in the ring body 10 here means that the through hole does not penetrate any peripheral wall of the ring body 10 .

As another embodiment of the accommodating channel in this embodiment, the accommodating channel is a second accommodating groove formed on the ring body 10 recessed from the proximal ring surface 10a of the ring body 10, and the second accommodating groove runs through the ring body 10 for another week wall. It should be noted that the peripheral wall through which the second accommodation groove penetrates is another peripheral wall opposite to the peripheral wall provided with the partial first accommodation groove 21, that is, when the partial first accommodation groove 21 is arranged on the first peripheral wall , the second accommodating groove runs through the second peripheral wall; when the partial first accommodating groove 21 is provided on the second peripheral wall, the second accommodating groove runs through the first peripheral wall. That is, the partial first receiving groove 21 is opposite to the second receiving groove in the thickness direction of the ring body 10 . Wherein, the way that the second accommodation groove penetrates the other peripheral wall of the ring body 10 is not only more conducive to the setting of the accommodation channel, but also the manufacturing process is simpler and easier to realize, and has lower requirements on the wall thickness of the ring body 10, which is more conducive to the setting of thin walls. .

Further, as shown in FIG. 3 to FIG. 5 , the accommodating channel includes a first sub-channel 31a and a second sub-channel 31b arranged at intervals in the circumferential direction. 21 communicates with each other, the pulling wire 200 placed in the partial first accommodation groove 21 is hooked on the hooking part, and its two extension ends pass through the first sub-channel 31a and the second sub-channel 31b respectively, and the two extensions of the pulling wire 200 The sections are independent, which avoids the product failure problem caused by the mutual entanglement and wear of the drawing wires 200 passing through a containing channel. Preferably, as shown in FIG. 3, in other embodiments, when the hooking portion is a protrusion 41 formed in the first receiving groove, the protrusion 41 is interposed between the first sub-channel 31a and the second sub-channel 31b Between, so that the force of the pulling wire is more balanced, and the pulling is more stable.

Wherein, based on the setting of the aforementioned accommodating channel, when the accommodating channel is a through hole recessed and formed in the ring body 10 from the proximal ring surface 10a of the ring body 10, the first sub-channel 31a and the second sub-channel 31b can be A first through hole and a second through hole formed in the ring body 10 are recessed from the proximal ring surface 10 a of the ring body 10 , and both the first through hole and the second through hole communicate with the local first receiving groove 21 . Then, after the pulling wire 200 placed in the partial first receiving groove 21 is hooked on the hooking portion, its two extension ends pass through the first through hole and the second through hole respectively.

When the accommodating channel is the second accommodating groove formed on the ring body 10 from the proximal ring surface 10a of the ring body 10, the first sub-channel 31a and the second sub-channel 31b are respectively from the proximal end of the ring body 10. A first sub-accommodating groove and a second sub-accommodating groove formed on the ring body 10 are concavely formed on the annular surface 10 a , and both the first sub-accommodating groove and the second sub-accommodating groove penetrate through the other peripheral wall of the ring body 10 . It should also be noted that the peripheral wall through which both the first sub-accommodating groove and the second sub-accommodating groove penetrate is another peripheral wall opposite to the peripheral wall provided with the partial first accommodating groove 21, that is to say, when the partial first accommodating groove 21 When 21 is arranged on the first peripheral wall, the first sub-accommodating groove and the second sub-accommodating groove both pass through the second peripheral wall; when part of the first accommodating groove 21 is arranged on the second peripheral wall, the first sub-accommodating groove and The second sub-accommodating grooves all pass through the first peripheral wall. That is, the partial first accommodation groove 21 is opposite to the first sub-accommodation groove and the second sub-accommodation groove in the thickness direction of the ring body 10 . After the pulling wire 200 placed in the partial first receiving groove 21 is hooked on the hooking part, its two extension ends are led out from the first sub-receiving groove and the second sub-receiving groove respectively.

Preferably, in other embodiments, as shown in FIG. 3, FIG. 4 and FIG. For the first sub-accommodating groove and the second sub-accommodating groove on the ring body 10, the first sub-accommodating groove and the second sub-accommodating groove are respectively the first arc-shaped groove and the second arc-shaped groove running through the other peripheral wall of the ring body 10. Groove, as shown in Fig. 3, Fig. 4 and Fig. 6, the first arc-shaped groove and the second arc-shaped groove overlap with the first receiving groove in the axial direction to form a hole for the pulling wire 200 to pass through. First perforation a and second perforation b. In this embodiment, an arc-shaped groove is provided on the ring-shaped ring body 10. On the one hand, the columnar pulling wire 200 can be placed in the ring body 10 as much as possible, which is beneficial to the thin-walled setting; The setting of the groove causes the local part of the annular ring body 10 to become too thin, which affects the strength of the ring body 10 . That is to say, the setting method of this embodiment can achieve thin-wall setting, and at the same time can effectively ensure the overall strength and connection reliability.

Referring to Figures 6 and 7, the axial length of the first through hole a and the second through hole b formed by overlapping the first arc-shaped groove and the second arc-shaped groove with the first receiving groove in the axial direction is W2 , the length of the circumferential overlap is W1, it can be understood that the perforation can be passed through by the pulling wire 200, and the minimum value of the axial length W2 and the circumferential length W1 is equal to or slightly greater than the diameter of the pulling wire 200, which can realize pulling It is sufficient for the wire to pass through the first through hole a and the second through hole b.

Exemplarily, as shown in FIG. 3 and FIG. 4 , the partial first accommodation groove 21 is arranged on the outer peripheral wall of the ring body 10 to form a partial outer first accommodation groove, and the first sub-accommodation groove and the second sub-accommodation groove are both The inner groove that runs through the inner peripheral wall of the ring body 10, the arcuate groove is an arc-shaped inner groove, and the two arc-shaped inner grooves form the first perforation a and the second perforation b with the local first receiving groove respectively , the bump 41 is located in the first partial outer receiving groove, and two arc-shaped inner grooves are interposed between the two sides of the bump 41, and the formed first through hole a and the second through hole b are also located on both sides of the bump 41, A W-shaped groove is formed in the partial outer first receiving groove. Referring to FIG. 8 , the pulling wire 200 placed in the W-shaped groove is hooked on the hooking part along the path S1 , and then the extension end passes through the perforation along the path S2 and then continues to enter the accommodating channel along the path S3 . The drawing wire has a radial transition along the path S2 through the perforation, which allows the ring body 10 to have a smaller wall thickness. Compared with the existing solutions, on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube and transport larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve The smaller outer diameter of the tube allows the sheath to be used in smaller vessels. By adopting the solution of this embodiment, the diameter of the pulling wire can be equal to the thickness of the pulling ring.

Among them, a part of the first receiving groove 21, a receiving channel, and a protrusion 41 in this embodiment form a group of traction structures, and in order to realize bending adjustment in different directions, in other embodiments, the traction structures are along the ring body 10. Set multiple groups of circumferential intervals. Wherein, multiple groups here refer to two groups or more than two groups. Exemplarily, two sets of traction structures are set up, and the two sets of traction structures are diametrically opposite to each other, so that two-way bending adjustment can be realized.

Further, since the traction ring is usually fixed on the distal end of the sheath, in order to enhance the connection strength between the traction ring and the distal end of the sheath, and prevent the circumferential rotation of the annular traction ring relative to the sheath, as shown in Figure 3, A connecting groove 50 is recessed on the outer peripheral wall of the traction ring, and the connecting groove 50 axially penetrates the proximal ring surface 10 a and the distal ring surface 10 b of the ring body 10 . Preferably, a plurality of connecting grooves 50 are arranged at intervals along the circumferential direction of the ring body 10 .

It should be noted that what is exemplified in Embodiment 4 is a specific implementation of the traction ring 100, and it should not be limited to include only one solution, and there may be many different solutions for its different structures. As has been described above, its The selection and combination of specific schemes can be set according to the actual situation.

Example 5

Referring to FIG. 9 , the present invention exemplarily provides a sheath tube A on the basis of the traction ring 100 provided in the above-mentioned embodiment 4. Referring to the traction ring 100 and the traction wire 200 described above, the tubular body 300 is provided with a traction channel communicating with the accommodation channel of the traction ring 100, and the traction wire 200 passing through the accommodation channel enters the accommodation channel. The traction ring 100 described in Embodiment 4 is selected, so that on the premise that the sheath tube has the same outer diameter, the present invention can achieve a larger inner diameter of the sheath tube and transport instruments of larger specifications; or on the premise that the sheath tube has the same inner diameter, The invention can achieve a smaller outer diameter of the sheath, and the sheath can be used in smaller blood vessels.

Example 6

On the basis of the traction ring 100 provided in the above-mentioned embodiment 4 and the sheath tube A provided in the embodiment 5, the present invention exemplarily provides an interventional instrument, which includes the sheath tube A as described in the fifth embodiment, The handle connected to the proximal end of the sheath tube A and the bending adjustment mechanism arranged in the handle, the traction wire 200 that enters the accommodating channel passes through the traction channel and is connected with the bending adjustment mechanism, and the bending adjustment mechanism moves under the drive of external force to pull The pull wire 200 is pulled and released, thereby effecting the bending of the sheath.

Example 7

In this embodiment, another specific implementation manner of the traction ring 100 is proposed on the basis of the traction ring 100 provided in the first embodiment above. Specifically, as shown in FIG. 10 , the first receiving groove of this embodiment is arranged circumferentially on the outer peripheral wall of the ring body 10 , so that the formed first receiving groove is an annular groove 22 , and the annular wall 42 of the annular groove 22 A hook portion is formed. That is to say, the hooking part is formed by the ring body 10 itself, and the accommodating channel recessed on the proximal ring surface 10 a of the ring body 10 communicates with the annular groove 22 , where communication refers to direct communication or indirect communication. The pulling wire 20 goes around the annular groove 22 of the ring body 10 for a circle, and then makes it hook on the hooking portion, and then passes through the accommodating channel. The drawing wire surrounds the annular groove 22 on the outside of the drawing ring, and when the force is applied, the stress points are distributed at various points around the drawing ring, reducing the risk of failure of the drawing wire and the drawing ring, and making the connection between the drawing wire and the drawing ring more reliable.

Continuing to refer to Fig. 3, in order to better adapt to the flexible shape of the drawing wire 200 and to increase the force-bearing area, the surface at the intersection of the first accommodation groove and the accommodation channel that is in contact with the drawing wire 200 is an arc surface, That is, the 90°bending position of the pulling wire is treated as an arc surface. Compared with the angular contact method, the arc-shaped contact surface can more effectively reduce wear, reduce the risk of failure of the drawing wire and the fixing ring, and make the connection between the drawing wire and the fixing ring more reliable.

As an implementation of the receiving channel in this embodiment, the receiving channel is a through hole formed in the ring body 10 from the proximal ring surface 10a of the ring body 10, and the through hole communicates with the annular groove 22. The communication at the position refers to direct communication or indirect communication, and the pulling wire 200 placed in the annular groove 22 is hooked on the ring body 10 and passes through the through hole. Note that the through hole formed in the ring body 10 here means that the through hole does not penetrate any peripheral wall of the ring body 10 .

As another embodiment of the accommodating channel in this embodiment, the accommodating channel is a second accommodating groove formed on the ring body 10 recessed from the proximal ring surface 10a of the ring body 10, and the second accommodating groove runs through the ring body 10 inner peripheral walls. The way that the second accommodation groove penetrates the inner peripheral wall of the ring body 10 is not only more conducive to the arrangement of the accommodation channel, but also makes the manufacturing process simpler and easier to implement, and has lower requirements on the wall thickness of the ring body 10, which is more conducive to the arrangement of thin walls.

Further, as shown in FIG. 10 and FIG. 12 , the accommodating channel includes a first sub-channel 31 a and a second sub-channel 31 b arranged at intervals in the circumferential direction, and both the first sub-channel 31 a and the second sub-channel 31 b communicate with the annular groove 22 , the communication here refers to direct communication or indirect communication, the pulling wire 200 placed in the annular groove 22 is hooked on the ring body 10, and its two extension ends pass through the first sub-channel 31a and the second sub-channel 31b respectively. It can be seen that the two extension sections of the pulling wire 200 are independent, which avoids the product failure caused by the pulling wires 200 passing through a containing channel being entangled with each other and worn out.

Wherein, based on the setting of the aforesaid accommodating channel in this embodiment, when the accommodating channel is a through hole recessed and formed in the ring body 10 from the proximal ring surface 10a of the ring body 10, the first sub-channel 31a and the second sub-channel 31a The channel 31b can be a first through hole and a second through hole formed in the ring body 10 from the proximal ring surface 10a of the ring body 10, and the first through hole and the second through hole are connected to the annular groove 22. Communication, the communication here refers to direct communication or indirect communication. Then, the two extension ends of the pulling wire 200 placed in the partial first receiving groove are hooked on the ring body 10 respectively pass through the first through hole and the second through hole.

When the accommodating channel is the second accommodating groove formed on the ring body 10 from the proximal ring surface 10a of the ring body 10, the first sub-channel 31a and the second sub-channel 31b are respectively from the proximal end of the ring body 10. A first sub-accommodating groove and a second sub-accommodating groove formed on the ring body 10 are concavely formed on the annular surface 10 a , and both the first sub-accommodating groove and the second sub-accommodating groove penetrate the inner peripheral wall of the ring body 10 . That is, the annular groove 22 is opposite to the first sub-accommodating groove and the second sub-accommodating groove in the thickness direction of the ring body 10 . The pulling wire 200 placed in the annular groove 22 is hooked on the ring body 10 and its two extension ends are led out from the first sub-accommodating groove and the second sub-accommodating groove respectively.

Further, since the traction ring is usually fixed on the distal end of the sheath, in order to enhance the connection strength between the traction ring and the distal end of the sheath, and to prevent the circumferential rotation of the annular traction ring relative to the sheath, the outer peripheral wall of the traction ring A connecting groove (not shown) is also recessed, and the connecting groove axially penetrates the proximal ring surface 10 a and the distal ring surface 10 b of the ring body 10 . Preferably, a plurality of connecting grooves are arranged at intervals along the circumferential direction of the ring body 10 .

It should be noted that what is exemplified in Embodiment 7 is a specific implementation of the traction ring 100, and it should not be limited to include only one solution, and there may be many different solutions for its different structures. The selection and combination of specific schemes can be set according to the actual situation.

Example 8

Referring to FIG. 12 , the present invention exemplarily provides a sheath tube A on the basis of the traction ring 100 provided in the above-mentioned embodiment 7. Referring to the traction ring 100 and the traction wire 200 described above, the tubular body 300 is provided with a traction channel communicating with the accommodation channel of the traction ring 100, and the traction wire 200 passing through the accommodation channel enters the accommodation channel. The traction ring 100 described in Embodiment 7 is selected so that on the premise that the sheath tube has the same outer diameter, the present invention can achieve a larger inner diameter of the sheath tube and deliver larger-sized instruments; or on the premise that the sheath tube has the same inner diameter, The invention can achieve a smaller outer diameter of the sheath, and the sheath can be used in smaller blood vessels.

Example 9

On the basis of the traction ring 100 provided in the above-mentioned embodiment 7 and the sheath tube A provided in the embodiment 8, the present invention exemplarily provides an interventional device, which includes the sheath tube A as described in the embodiment 8, The handle connected to the proximal end of the sheath tube A and the bending adjustment mechanism arranged in the handle, the traction wire 200 that enters the accommodating channel passes through the traction channel and is connected with the bending adjustment mechanism, and the bending adjustment mechanism moves under the drive of external force to pull The pull wire 200 is pulled and released, thereby effecting the bending of the sheath.

In the traction ring, sheath and interventional instrument of the present invention, the traction wire is hooked on the hook part and forms surface contact with the hook part, which ensures reliability; at the same time, the traction wire is placed in the first accommodation groove and self-loops The accommodating channel on the body is drawn out, which makes at least part of the pulling wire accommodated in the ring body, effectively reducing the thickness of the overall structure and realizing a thin-walled design. So that on the premise of the same outer diameter of the sheath tube, the present invention can achieve a larger inner diameter of the sheath tube and transport larger-sized instruments; or on the premise of the same inner diameter of the sheath tube, the present invention can achieve a smaller outer diameter of the sheath tube , the sheath can be used in smaller vessels.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (14)

1. A traction ring, which is used to connect a traction wire, is characterized in that it comprises a ring body, and the ring body has a relative near-end annulus and a far-end annulus, and is located between the proximal annulus and the Two opposite peripheral walls between the distal ring surfaces, one of the peripheral walls of the ring body is recessed with a first receiving groove, and the proximal ring surface of the ring body is recessed and communicated with the first receiving groove. The accommodating channel, the first accommodating groove is formed with a hooking part for hooking the pulling wire, and the pulling wire placed in the first accommodating groove is hooked on the hooking part and then released from the accommodating passage through. 2. The traction ring according to claim 1, wherein the accommodating channel is a second accommodating groove that runs through the other peripheral wall of the ring body, and the ring body is also provided with a channel that communicates with the first accommodating channel. The slot and the perforation of the second accommodating slot, the pulling wire placed in the first accommodating slot is hooked on the hooking part, passes through the perforation, and then enters the second accommodating slot. 3 . The traction ring according to claim 2 , wherein the first accommodation groove and the second accommodation groove axially overlap to form the through hole through which the traction wire can pass. 4 . 4. The traction ring according to claim 2, characterized in that, the second receiving groove is an arc-shaped groove formed by recessing. 5. The traction ring according to any one of claims 1-4, characterized in that, the first accommodating groove is partially provided on the peripheral wall of the ring body, and the hooking portion includes a part formed in the first accommodating groove A bump in a slot. 6 . The traction ring according to claim 5 , characterized in that, the surface of the protrusion where the traction wire is hooked is an arc surface. 7 . 7. The traction ring according to claim 5, characterized in that, the top of the protrusion is provided with a recess for limiting the position of the traction wire hooked thereon, and/or, the protrusion A side surface away from the bottom wall of the first accommodating groove extends axially to form a blocking portion for limiting the pulling wire hooked thereon. 8. The traction ring according to claim 5, characterized in that, a set of traction structures is formed by one said first accommodation groove, one said accommodation channel and one said protrusion, and said traction structure is along the Set multiple groups of circumferential intervals. 9. The traction ring according to any one of claims 1 to 4, characterized in that, the first receiving groove is circumferentially arranged on the outer peripheral wall of the ring body, so that the formed first receiving groove is annular A groove, the annular wall of the annular groove forms the hooking portion. 10 . The traction ring according to claim 9 , wherein a surface at the intersection of the first accommodation groove and the accommodation passage which is in contact with the traction wire is an arc surface. 11 . 11. The traction ring according to any one of claims 1-4, characterized in that, the accommodating channel comprises a first sub-channel and a second sub-channel arranged at intervals in the circumferential direction, and the first sub-channel and the second sub-channel Both sub-channels communicate with the first receiving tank; wherein, When the accommodating channel is a second accommodating groove formed through the other peripheral wall of the ring body, the first sub-channel and the second sub-channel are respectively first sub-channels communicating with the first accommodating groove The accommodation tank and the second sub-accommodation tank; wherein, When the first receiving groove and the second receiving groove axially overlap to form the through hole through which the pulling wire can pass, the first sub-accommodating groove and the second sub-accommodating groove are respectively connected to the second receiving groove The first receiving groove overlaps axially to form a first through hole and a second through hole through which the two ends of the pulling wire can respectively pass; wherein, When the second receiving groove is an arc-shaped groove formed by recessing, the first sub-accommodating groove and the second sub-accommodating groove are respectively a first arc-shaped groove and a second arc-shaped groove formed by recessing groove. 12. The traction ring according to claim 11, wherein when the hooking portion includes a protrusion formed in the first receiving groove, the protrusion is interposed between the first sub-channel and between the second subchannel. 13. A sheath tube, characterized in that it comprises a tubular body, a traction ring according to any one of claims 1 to 12 and a traction wire arranged on the tubular body, and the traction ring and the traction wire are arranged in the tubular body. The accommodating channel of the ring communicates with a pulling channel, and the pulling wire passing through the accommodating channel enters the accommodating channel. 14. An interventional instrument, characterized in that it comprises the sheath tube according to claim 13, a handle connected to the proximal end of the sheath tube, and a bending adjustment mechanism arranged in the handle, and enters into the accommodating channel The pulling wire passes through the pulling channel and is connected with the bending adjustment mechanism.

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