CN118809961A - Head end of visual catheter, forming method and visual catheter - Google Patents
Head end of visual catheter, forming method and visual catheter Download PDFInfo
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- CN118809961A CN118809961A CN202310409853.XA CN202310409853A CN118809961A CN 118809961 A CN118809961 A CN 118809961A CN 202310409853 A CN202310409853 A CN 202310409853A CN 118809961 A CN118809961 A CN 118809961A
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Abstract
The invention belongs to the field of medical equipment, and discloses a head end of a visual catheter, a forming method and the visual catheter, wherein the head end forming method of the visual catheter comprises the steps of fixing a stay wire head end fixed on a stay wire ring to an image sensor; installing an illumination system, the image sensor and the stay wire ring outside the distal end of the bending control catheter; placing the illumination system, the image sensor and the pull wire into a mold; and injecting a transparent material into the mold, and demolding after curing and molding. The visual catheter head end is obtained by using the glue injection integrated curing molding process without using a prefabricated part for assembly, so that the wall thickness of the head end prefabricated part is prevented from limiting the size and compressing the space of the head end part, the step of assembling the image sensor and the lighting system in the head end prefabricated part is omitted, and the light damage or unexpected stress of the image sensor in the assembly process can be prevented from influencing the final imaging effect.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a head end of a visual catheter, a forming method and the visual catheter.
Background
Visual catheters or endoscopes are a common medical instrument that can be used for diagnosis or treatment in a variety of fields including digestion, respiration, surgery, and the like. The visual catheter or endoscope can be inserted into the human body through the natural cavity of the human body or enter the human body through a small incision of a micro-wound operation, and the human body part can be directly observed by naked eyes of an operator through a micro-image sensor (such as CMOS).
As shown in fig. 1, the visual catheter mainly comprises a head end 1, a bending control catheter 2, a non-bending control catheter 3 and a control handle 4. Wherein the head end 1 is typically used to house an image sensor, such as a CMOS, and an illumination system. In general, the head end 1 adopts a pre-processing part (such as injection molding and precision cutting) as a base for installing an image sensor and an illumination system, so that the stability is high, and most of catheter requirements are met, but for a catheter with a smaller size, the processing precision of the pre-processing part is limited, and a certain wall thickness exists in the pre-processing part inevitably, so that the size of the head end of a visible catheter is limited to be further reduced; meanwhile, the imaging effect is ensured by considering the relative positions of the image sensor and the illumination system in design, and the processing difficulty of the head end assembly is further increased. These factors affect the cost of the visualization catheter and also limit the ability of the visualization catheter to access finer body lumens for viewing. In addition, the miniature image sensor is used as a high-precision electronic element, has extremely high requirements on an assembly process, and can influence the final imaging effect due to slight damage or unexpected stress in the process.
Disclosure of Invention
The invention aims to provide a head end of a visual catheter, a forming method and the visual catheter, which adopt an integral curing forming mode, so that the limitation of wall thickness of a prefabricated part can be avoided, the size of the head end is reduced, the assembly difficulty is greatly reduced, the possibility of image sensor loss is reduced, and the low cost is called as possible.
The technical scheme provided by the invention is as follows:
In one aspect, a method of forming a head end of a visual catheter is provided, comprising:
Fixing the stay wire head end fixed on the stay wire ring on the image sensor;
Installing an illumination system, the image sensor and the stay wire ring outside the distal end of the bending control catheter;
Placing the illumination system, the image sensor and the pull wire into a mold;
and injecting a transparent material into the mold, and demolding after curing and molding.
In some embodiments, the securing the wire head end secured to the wire loop to the image sensor specifically includes:
Fixing the stay wire on the stay wire ring;
processing the end of the stay wire extending out of the stay wire ring into a flat shape to form a flat section;
The flat section of the pull wire is fixed to one side of the image sensor.
In some embodiments, the mounting the illumination system, the image sensor, and the pull wire ring outside the distal end of the bend control catheter specifically comprises:
fixing an illumination system to a side of the image sensor;
Installing the illumination system and the image sensor outside the distal end of the bend control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
In some embodiments, the mounting the illumination system, the image sensor, and the pull wire ring outside the distal end of the bend control catheter specifically comprises:
fixing the illumination system on the distal end face of the bending control catheter;
installing the image sensor outside the distal end of the bending control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
In some embodiments, the placing the illumination system and the image sensor into the mold further comprises:
one lining rod or a plurality of lining rods are arranged at intervals at preset positions in the die.
In some embodiments, the inner diameter of the mold is the same as the outer diameter of the bend control conduit;
the height of the die is greater than the length of the head end; and/or;
the profile shape of the closed end in the longitudinal section of the die is sharp or circular arc or stepped trapezoid.
On the other hand, still provide the head end of a visual pipe, including lighting system, image sensor, act as go-between and transparent piece, the head end of acting as go-between is fixed in image sensor, transparent piece integrated into one piece curing molding and parcel lighting system, image sensor with act as go-between, and with lighting system, image sensor with act as go-between and fix.
In some embodiments, the pull wire has a flat section including at least one flat face that is secured to one side of the image sensor; the side surface extends along a longitudinal axis of the image sensor, which coincides with the extending direction of the pull wire.
In some embodiments, one or more working channels are provided within the head end of the visual catheter; and/or; the profile of the far end of the longitudinal section of the head end is pointed or circular arc or stepped trapezoid.
In yet another aspect, a visual catheter is provided, including a control handle, a non-bend-controlling catheter, a bend-controlling catheter, and a tip of the visual catheter according to any of the foregoing embodiments, connected in sequence.
The invention has the technical effects that: the visible catheter head end is obtained by using the glue injection integrated curing molding process, the whole head end part comprises the image sensor, the lighting system and the stay wire part, is wrapped by transparent materials, is assembled without using a pre-processing part, not only avoids the limitation of the wall thickness of the head end pre-processing part on the size and the space compression of the head end part, but also saves the design space of a light path channel, and leaves a space for other parts, in addition, the step of assembling the image sensor and the lighting system in the head end pre-processing part is omitted, and the light damage or the unexpected stress influence on the final imaging effect of the image sensor in the assembling process can be avoided.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic view of a prior art visual catheter;
Fig. 2 is a schematic flow chart of a method for forming a head end of a visual catheter according to an embodiment of the application;
Fig. 3 is a process schematic diagram of a method for forming a head end of a visual catheter according to an embodiment of the present application;
Fig. 4 is a schematic view of a longitudinal section of a distal end of a tip of a visual catheter according to a first embodiment of the present application;
fig. 5 is a schematic view of a structure in which a distal end profile of a longitudinal section of a head end of a visual catheter according to a first embodiment of the present application is arc-shaped;
Fig. 6 is a schematic view of a structure in which a distal end profile of a longitudinal section of a head end of a visual catheter according to a first embodiment of the present application is in a stepped circular arc shape;
FIG. 7 is a schematic view showing a structure in which a distal end profile of a longitudinal section of a tip end of a visible catheter is stepped and flat-bottomed
FIG. 8 is a schematic cross-sectional view of a head end of a visual catheter according to a third embodiment of the application;
FIG. 9 is a schematic longitudinal cross-sectional view of a head end and a bend control catheter according to a third embodiment of the present application;
FIG. 10 is a modified configuration of the tip of the visual catheter of the third embodiment of the application;
FIG. 11 is a schematic cross-sectional view of a head end of a visual catheter according to a fourth embodiment of the application;
FIG. 12 is a schematic longitudinal cross-sectional view of a head end and a bend control catheter according to a fourth embodiment of the present application;
FIG. 13 is a schematic cross-sectional view of a head end of a visual catheter according to a fifth embodiment of the application;
FIG. 14 is a schematic longitudinal cross-sectional view of a head end and a bend control catheter as shown in embodiment five;
fig. 15 is a schematic view of a molding process of a head end according to a fifth embodiment.
Reference numerals illustrate:
1. A headend; 11. an image sensor; 12. a lighting system; 14. a working channel; 15. a transparent member; 2. a bend control catheter; 21. a wire passage; 22. a pull wire channel; 3. a non-bend-controlling catheter; 4. a control handle; 5. a pull wire; 51. a flat section; 6. pulling a wire loop; 7. a mold; 8. and lining bars.
Detailed Description
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the visual catheter comprises a head end 1, a bending control catheter 2, a non-bending control catheter 3 and a control handle 4 which are sequentially connected, wherein the bending control catheter 2 controls bending through a stay wire arranged in the bending control catheter 2, and the stay wire is controlled by the control handle 4. As shown in fig. 4, the head end 1 mainly includes an image sensor 11 and an illumination system 12, and the illumination system 12 may be an LED lamp or an optical fiber. The optical signals collected by the image sensor 11 are converted into electrical signals, and then the electrical signals are sent to an image display, the visual pictures collected by the image sensor 11 are displayed through the image display, and the upper, lower, left and right directions of the visual pictures in the image display can be respectively in one-to-one correspondence with the upper, lower, left and right surfaces of the image sensor 11.
Example 1
As shown in fig. 2 and 3, a method for forming a head end of a visual catheter includes:
step S100, fixing the end of the stay wire fixed on the stay wire ring on the image sensor;
Step 200, installing an illumination system, the image sensor and the stay wire ring outside the distal end of the bending control catheter;
step S300, placing the lighting system, the image sensor and the stay wire into a mold;
step S400, injecting a transparent material into the mold, and demolding after curing and molding.
As shown in fig. 3, when assembling the head end 1, the pull wire 5 may be first fixed on the pull wire ring 6, and the head end of the pull wire 5 extends from the pull wire ring 6 to the outside of the pull wire ring 6, and then the head end of the pull wire 5 is fixed on the image sensor 11. The illumination system 12 and the image sensor 11 are arranged outside the distal end of the bending control catheter 2, the wire ring 6 is fixed on the distal end face of the bending control catheter 2, and wires of the illumination system 12 and the image sensor 11 pass through a wire channel 21 of the bending control catheter 2 and pass through the non-bending control catheter 3, and the wire 5 passes through a wire channel 22 of the bending control catheter 2 and passes through the non-bending control catheter 3.
In this embodiment, the pull wire ring 6 may be in a metal annular sheet shape, the diameter of the pull wire ring 6 is larger than the inner diameter of the pull wire channel 22, so as to prevent the pull wire ring 6 from sliding out of the pull wire channel 22, and the pull wire ring 6 may be connected with the bending control catheter 2 by physical or chemical means. The size of the stay wire channel 22 is slightly larger than that of the stay wire 5, so that the movement track of the stay wire 5 can be protected and limited, and the size of the wire channel 21 can be set according to actual needs.
As a simple modification, the wires of the pull wire 5, the illumination system 12 and the image sensor 11 may be passed through the bend control catheter 2 and the non-bend control catheter 3, then the pull wire ring 6 is fixed on the distal end surface of the bend control catheter 2, and then the head end of the pull wire 5 is fixed on the image sensor 11, that is, the specific mounting sequence of the head end 1 and the bend control catheter 2 in the embodiment may be changed as required, so long as the assembly of the head end 1 and the bend control catheter 2 can be realized.
Then the assembled visual catheter is turned over, so that the illumination system 12 and the image sensor 11 are placed in the customized mold 7, the mold 7 is made of non-adhesive transparent materials, the relative positions of the components of the head end 1 and the mold 7 are kept unchanged, the softness of the wall of the bending control catheter 2 is utilized, the superfine needle on the glue injector is squeezed into the gap between the bending control catheter 2 and the mold 7, transparent UV glue is injected into the mold 7, the superfluous glue on the surface of the mold 7 is erased, the glue can be rapidly solidified and molded under UV light irradiation to form a transparent piece 15, the transparent piece 15 wraps the image sensor 11, the illumination system 12 and the stay wire 5 and forms a whole with the image sensor 11, the illumination system 12 and the stay wire 5, and the mold 7 is taken down, so that the head end 1 of the visual catheter can be obtained. Of course, instead of injecting transparent glue into the mold 7 to mold around the image sensor 11 and the illumination system 12, other transparent materials, such as thermosetting materials, curable glue, and the like, may be injected. When the wrapping material is selected, the transparent shape of the wrapping material after solidification is ensured, and the molding and post-treatment operation is simple and feasible.
Specifically, in fig. 3, step (1) is wire drawing shaping, step (2) is a fixed lighting system, step (3) is relative fixation of a head end part, step (4) is pipe assembly, step (5) is to place a pipe in a mold, step (6) is to inject glue into the mold, step (7) is glue solidification, and step (8) is to remove the mold.
In this embodiment, preferably, the inner diameter of the mold 7 is the same as the outer diameter of the bending control duct 2, so that the outer diameter of the head end 1 after molding is the same as the outer diameter of the bending control duct 2; the height of the mould 7 is slightly larger than the length of the head end 1, so that a small part of the bending control conduit 2 is also positioned in the mould 7, and glue can submerge the cavity opening of the bending control conduit 2 and enter the cavity opening of the bending control conduit 2 a little so as to increase the connection firmness of the head end 1 and the bending control conduit 2.
It should be noted that, in this embodiment, the glue type with lower viscosity and better fluidity is selected, and the glue is placed for 24 hours under vacuum condition before being injected, so that bubbles are avoided in the injection molding process of the head end 1, and the light path of the lighting system 12 is affected, so as to improve the lighting effect.
The visible catheter head end is obtained by using an injection integrated curing molding process, the whole head end part, including the image sensor, the illumination system and the stay wire, is wrapped by transparent materials, and is not required to be assembled by using a pre-processing part, so that on one hand, the limitation of the wall thickness of the head end pre-processing part on the size and the space compression of the head end part are avoided, on the other hand, the design space of an optical path channel is saved, and the space is reserved for other parts. The method for forming the head end of the visual catheter not only can reduce the size of the head end, but also can provide possibility for adding a new working channel on the basis of not enlarging the size of the head end, thereby improving the space utilization rate of the working channel.
In some embodiments, the distal profile of the closed end in the longitudinal section of the die is pointed or rounded or stepped trapezoidal.
Preferably, the present embodiment can change the shape of the head end 1 by changing the mold 7. As shown in fig. 4 to 7, the present example illustrates several possible head end shapes, wherein the image sensor 11 and the illumination system 12 are wrapped with a transparent material. Examples of the applications of the present embodiment include, but are not limited to, the several styles illustrated in the figures, which may be customized for different uses: (1) Fig. 4 shows that the head end 1 is pointed and can facilitate the catheter to enter the tiny cavity of the human body; (2) Fig. 5 shows that the head end 1 is arc-shaped, so that on one hand, the catheter can be prevented from scratching human tissues, and on the other hand, the head end can be used as a convex lens to play roles of a light gathering lens and a magnifying lens; (3) FIG. 6 shows that the head end 1 is arc-shaped with steps, and the added step design can act as an anchor to better fix the head end at a target position; (4) Fig. 7 shows that the head end 1 is shaped like a flat bottom with steps, and does not interfere with signal reception of the image sensor 11 while achieving better fixation.
Example two
In addition to the above embodiment, the fixing the wire end fixed on the wire loop to the image sensor in step S100 specifically includes:
Fixing the stay wire on the stay wire ring;
processing the end of the stay wire extending out of the stay wire ring into a flat shape to form a flat section;
The flat section of the pull wire is fixed to one side of the image sensor.
Specifically, the pull wire 5 is welded on the pull wire ring 6, and a portion of the pull wire 5 extending upwards out of the pull wire ring 6 is pretreated, so that the head end of the pull wire 5 is flat to form a flat section 51, wherein the pretreatment of the pull wire 5 can be a shape design in a processing process, or can be obtained by pressing, machining or grinding a finished product of the pull wire 5. The flat section 51 of the pull wire 5 is adhered to one side of the image sensor 11, so that the position of the pull wire 5 is relatively fixed. In this embodiment, the distal end of the pull wire 5 includes the flat section 51, so that the surface of the pull wire 5 connected to the image sensor 11 is set as a flat surface, the connection surface of the pull wire 5 and the image sensor 11 is larger, the connection is firm, and the relative position can be kept unchanged, therefore, in the bending control process, the flat section 51 can limit the bending direction of the image sensor 11, so that the image sensor 11 can bend only towards two flat surfaces of the flat section 51, and the bending direction of the image sensor 11 is consistent with the bending control direction of the catheter, so that the visual image is consistent with the bending direction of the catheter, the image sensor 11 is prevented from rotating and bending towards any direction, and the bending direction of the image sensor 11 is controlled.
Example III
On the basis of the first or second embodiment, S200 of installing the illumination system, the image sensor and the pull wire ring outside the distal end of the bending control catheter specifically includes:
fixing an illumination system to a side of the image sensor;
Installing the illumination system and the image sensor outside the distal end of the bend control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
Specifically, the illumination system 12 of the present embodiment is fixed to the image sensor 11, and the following description will take an example in which the illumination system 12 includes two LED lamps. As shown in fig. 8, two LED lamps are respectively fixed on two opposite surfaces of the image sensor 11, and it is ensured that the surface with the largest area of the two LED lamps is contacted with the image sensor 11, so as to maximize space utilization and further reduce the size of the head end of the visible catheter. Because the head end 1 is wrapped by transparent materials, the light source has good emissivity, and a single LED lamp can achieve the effect of uniform illumination of light of two LED lamps, as shown in FIG. 10, the two LED lamps in the lighting system 12 can be deleted into one, so that more possibility is provided for a new working channel by leaving a space.
When the image sensor 11 with the illumination system 12 fixed thereon is mounted outside the distal end of the bending control catheter 2, and then the orientation of the pull wire loop 6 outside the distal end of the bending control catheter 2 is adjusted so that the orientation of the flat surface of the flat section 51 of the pull wire 5 away from the image sensor 11 is consistent with the bending control direction of the bending control catheter 2, as shown in fig. 9, the flat surface of the pull wire 5, which is not in contact with the image sensor 11, can be oriented towards the thinnest side of the wall of the bending control catheter 2, and the direction in which the thinnest side of the wall of the bending control catheter 2 extends outwards is the bending control direction of the bending control catheter 2, and here, the specific position of the surface of the image sensor 11 bonded to the flat section 51 of the pull wire 5 can be any surface of the image sensor 11 extending along the longitudinal axis thereof, and the invention is not limited thereto. Since the direction of the visual image on the image display is consistent with that of the image sensor 11, and the relative positions of the image sensor 11 and the pull wire 5 are fixed, the visual image obtained finally is consistent with the bending control direction of the bending control catheter 2, for example, the visual image can present a downward moving visual angle along with the downward bending of the bending control catheter 2.
Example IV
On the basis of the first or second embodiment, S200 of installing the illumination system, the image sensor and the pull wire ring outside the distal end of the bending control catheter specifically includes:
fixing the illumination system on the distal end face of the bending control catheter;
installing the image sensor outside the distal end of the bending control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
Specifically, when the LED lamp is fixed on the image sensor 11, the LED lamp and the image sensor 11 are placed side by side, and are located on the distal end surface of the head end 1, and because the LED lamp has a thermal effect, heat is relatively concentrated, and local high temperature is easily caused, which causes damage to human tissues and the image sensor 11. In this embodiment, as shown in fig. 11 and 12, the lighting system 12 is placed at the position of the head end 1 close to the bend control duct 2, and the lighting system 12 is located below the image sensor 11, so that not only can space be further saved for the head end 1 and a possibility is provided for adding a new working channel, but also the heat dissipation efficiency of the light source of the LED is effectively improved and local scalding caused by heat concentration is avoided because the cavity of the bend control duct 2 contains air and the light source of the LED is close to the bend control duct 2.
In this embodiment, only the installation of the illumination system 12 is different from the above-mentioned embodiment, and the LED lamp needs to be fixed at a proper position on the distal end face of the bending control catheter 2 in advance, and the installation of other components, such as the image sensor 11, the pull wire 5, the pull wire ring 6, etc., is the same as the above-mentioned embodiment, and the description of this embodiment is omitted.
Example five
On the basis of the first embodiment, the second embodiment, the third embodiment, or the fourth embodiment, the step S300 further includes, before the lighting system and the image sensor are placed in the mold:
one lining rod or a plurality of lining rods are arranged at intervals at preset positions in the die.
Specifically, in order to optimize the space utilization rate of the head end of the visual catheter, the stay wire 5, the image sensor 11 and the lighting system 12 in the head end structure of the present embodiment remain unchanged based on the above embodiment, as shown in fig. 13, a new working channel 14 is added to the side surface of the image sensor 11, as shown in fig. 14, and when the working channel 14 is newly added to the head end 1, a channel corresponding to the newly added working channel 14 on the head end 1 needs to be added to the bend control catheter 2. The number of working channels 14 on head end 1 may be one or more. With the increase of the number of working channels 14, the additional functions of the visual catheter are increased, and the new working channels 14 can be used for placing electromagnetic induction sensors, biopsy tools and other components, so that the visual catheter can be better positioned, and the visual catheter is possible to be applied to the aspects of integrating diagnosis and treatment functions.
As shown in fig. 15, the process of adding a working channel 14 on the head end 1 is to reserve a lining rod 8 at a position corresponding to the working channel 14 in the die 7, and then perform glue injection and curing molding treatment. And after the head end 1 is molded, taking out the reserved lining rod 8 and the die 7 in sequence, and obtaining the head end structure reserved with the working channel 14. Wherein, the surface of the reserved lining rod 8 needs to be subjected to pretreatment so as not to adhere to the glue. The number and size of the lining rods 8 can be flexibly selected according to the number and size of the working channels 14.
In summary, the method for forming the head end of the visual catheter in the embodiment has the following technical effects:
(1) The head end of the visual catheter adopts the UV glue curing molding method, so that the process flow of head end processing is shortened, the processing cost is reduced, a pre-processing piece is not needed, the volume of the head end can be reduced, the head end is processed into integrated molding, two steps of assembling an image sensor and an illumination system in a head end pre-processing part and assembling the head end and a bending control catheter are omitted, the head end and the bending control catheter are directly completed in one step in a die, slight damage or unexpected stress influence on the final imaging effect of the image sensor in the assembling process can be avoided, and further head end part loss caused in the head end assembling process is avoided.
(2) The head end transparent material omits the special light path channel design, and can change the position and the quantity of the light sources on the basis of ensuring the illumination effect, thereby avoiding heat accumulation and scalding human tissues.
(3) On the basis of not increasing the processing difficulty and the processing cost, the shape, the outer diameter size and the like of the head end of the catheter can be freely adjusted by changing the die, the die is not required to be opened or precisely processed, only the parameters of the die are required to be changed, and the cost can be effectively reduced.
(4) In the processing process, the stay wire is preprocessed, the shaping processing part at the upper end of the stay wire is a flat section with a flat surface facing the thinnest side of the conduit wall of the bendable section, the other flat surface is bonded with one surface of the image sensor, the bonded image sensor surface is not limited herein, and can correspond to any one of the directions of the visible images, namely the upper direction, the lower direction, the left direction and the right direction, so that the bending direction of the conduit is always consistent with the direction of the visible image on the display, the new head end structure can control the direction of the visible image in the display to correspond to the bending control direction of the conduit, and operation and observation of a focus are facilitated for operators.
(5) In the head end assembly process, a lining rod is reserved at a die position corresponding to the channel, then glue injection and solidification forming treatment are carried out, after the head end is formed, the reserved lining rod and the die are taken out, a new working channel is added outside the original image sensor and lighting system component of the head end structure, the processing difficulty is not improved, and the possibility of adding other functions to the visual catheter is provided.
Example six
The head end of the visual catheter, as shown in fig. 3-8, comprises an illumination system 12, an image sensor 11, a stay wire 5 and a transparent member 15, wherein the head end of the stay wire 5 is fixed on the image sensor 11, the transparent member 15 is integrally cured and formed and wraps the illumination system 12, the image sensor 11 and the stay wire 5, and the transparent member 15 is fixed with the illumination system 12, the image sensor 11 and the stay wire 5. The head end of the visual conduit is formed by any one of the forming methods of the first to fifth embodiments. As shown in fig. 10, one or more working channels 14 may be provided within the head end of the formed visual conduit, which may be easier to form, reduce manufacturing difficulty and manufacturing costs, and add new working channels 14, as compared to using machining to form, which may give the visual conduit the possibility of other functions. The distal end shape of the head end of the formed visual catheter can be changed according to the shape of the die 7, and the distal end profile shape of the longitudinal section of the head end 1 can be in a pointed shape, a circular arc shape, a stepped trapezoid shape or the like to meet different use requirements of the head end 1.
Example seven
As shown in fig. 1, the visual catheter comprises a control handle 4, a non-bending control catheter 3, a bending control catheter 2 and a head end 1 which are sequentially connected, wherein the head end 1 is the head end 1 of the visual catheter in the sixth embodiment. The head end 1 of the visual catheter is obtained by using an injection-integrated curing molding processing technology, so that the wall thickness of a head end pre-processing part is prevented from limiting the size and compressing the space of the head end part, the head end is processed into an integrated molding, the step of assembling an image sensor and an illumination system in the head end pre-processing part is omitted, and the final imaging effect can be prevented from being influenced by slight damage or unexpected stress of the image sensor 11 in the assembling process.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A method of shaping a head end of a visual conduit, comprising:
Fixing the stay wire head end fixed on the stay wire ring on the image sensor;
Installing an illumination system, the image sensor and the stay wire ring outside the distal end of the bending control catheter;
Placing the illumination system, the image sensor and the pull wire into a mold;
and injecting a transparent material into the mold, and demolding after curing and molding.
2. The method for forming a head end of a visual conduit according to claim 1, wherein,
The fixing of the stay wire head end fixed on the stay wire ring to the image sensor specifically comprises:
Fixing the stay wire on the stay wire ring;
processing the end of the stay wire extending out of the stay wire ring into a flat shape to form a flat section;
The flat section of the pull wire is fixed to one side of the image sensor.
3. A method of forming a head end of a visual conduit according to claim 2, wherein,
The mounting of the illumination system, the image sensor and the pull wire ring outside the distal end of the bend control catheter specifically comprises:
fixing an illumination system to a side of the image sensor;
Installing the illumination system and the image sensor outside the distal end of the bend control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
4. A method of forming a head end of a visual conduit according to claim 2, wherein,
The mounting of the illumination system, the image sensor and the pull wire ring outside the distal end of the bend control catheter specifically comprises:
fixing the illumination system on the distal end face of the bending control catheter;
installing the image sensor outside the distal end of the bending control catheter;
adjusting the position of the stay wire ring outside the distal end of the bending control catheter to ensure that the orientation of the distal end of the stay wire away from the flat surface of the image sensor is consistent with the bending control direction of the bending control catheter;
and fixing the pull wire ring on the distal end face of the bending control catheter.
5. The method for forming a head end of a visual conduit according to claim 1, wherein,
The method further comprises the steps of, before placing the illumination system and the image sensor in the mold:
one lining rod or a plurality of lining rods are arranged at intervals at preset positions in the die.
6. The method for forming a head end of a visual conduit according to claim 1, wherein,
The inner diameter of the die is the same as the outer diameter of the bending control conduit;
the height of the die is greater than the length of the head end; and/or;
the profile shape of the closed end in the longitudinal section of the die is sharp or circular arc or stepped trapezoid.
7. The head end of the visual catheter is characterized by comprising an illumination system, an image sensor, a stay wire and a transparent piece, wherein the head end of the stay wire is fixed to the image sensor, and the transparent piece is integrally cured and formed, wraps the illumination system, the image sensor and the stay wire and is fixed to the illumination system, the image sensor and the stay wire.
8. The head end of a visual catheter as set forth in claim 7, wherein,
The stay wire is provided with a flat section, the flat section comprises at least one flat surface, and the flat surface is fixed with one side surface of the image sensor; the side surface extends along a longitudinal axis of the image sensor, which coincides with the extending direction of the pull wire.
9. The head end of a visual catheter as set forth in claim 7, wherein,
One or more working channels are arranged in the head end of the visual catheter; and/or;
The profile of the far end of the longitudinal section of the head end is pointed or circular arc or stepped trapezoid.
10. A visual catheter comprising a control handle, a non-bend-controlling catheter, a bend-controlling catheter, and a tip of the visual catheter of any one of claims 7-9 connected in sequence.
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CN202310409853.XA CN118809961A (en) | 2023-04-17 | 2023-04-17 | Head end of visual catheter, forming method and visual catheter |
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CN202310409853.XA CN118809961A (en) | 2023-04-17 | 2023-04-17 | Head end of visual catheter, forming method and visual catheter |
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