CN117797384A

CN117797384A - Pressure injection pump

Info

Publication number: CN117797384A
Application number: CN202211180571.9A
Authority: CN
Inventors: 黄青青; 陈国明
Original assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Current assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2024-04-02
Also published as: WO2024066932A1

Abstract

The invention provides a pressure injection pump which is used for pressurizing or depressurizing a medical balloon and comprises a pushing mechanism, a switching mechanism and a pump body; the switching mechanism is connected with the pump body; one end of the pushing mechanism is arranged outside the switching mechanism, and the other end of the pushing mechanism penetrates through the switching mechanism and is arranged in the pump body; the pushing mechanism and the pump body are enclosed to form an injection cavity, and the pushing mechanism can move to change the volume of the injection cavity; the switching mechanism has a locking state and an unlocking state, and is capable of switching between the locking state and the unlocking state; the switching mechanism in the locked state locks the pushing mechanism to prevent axial movement of the pushing mechanism; the switching mechanism in the unlocked state releases the pushing mechanism to allow axial movement of the pushing mechanism. The pressure injection pump has the advantages of simple structure and convenient operation, thus reducing the production cost and simplifying the operation process of the operation.

Description

Pressure injection pump

Technical Field

The invention relates to the technical field of medical appliances, in particular to a pressure injection pump.

Background

Interventional procedures are currently the more advanced and effective treatment for vascular disease, and develop very rapidly. The pressure injection pump for expanding the balloon is a medical instrument commonly used in interventional therapy operation, and is mainly used for pressurizing a balloon expanding catheter to expand the balloon so as to achieve the purpose of expanding a blood vessel or reserving a stent in the blood vessel.

In interventional operation, a pressure injection pump is adopted to inject target solution such as contrast agent or physiological saline into the diseased part of the blood vessel of a patient under pressure, so that doctors can observe and monitor the surgical treatment and the diseased part conveniently through an electronic computer tomography technology. In addition, the pressure injection pump can expand the balloon and detect the pressure in the balloon, and after the stent is expanded, the pressure injection pump can decompress the balloon to shrink the balloon.

The pressure injection pump in the prior art has the advantages of complex structure, higher production cost and higher operation difficulty, so that the complexity of operation is increased, and the operation time is prolonged.

Disclosure of Invention

The invention aims to provide a pressure injection pump which is simple in structure and convenient to operate, can reduce the production cost and can simplify the operation process of an operation.

In order to achieve the above purpose, the present invention provides a pressure injection pump for pressurizing or depressurizing a medical balloon, comprising a pushing mechanism, a switching mechanism and a pump body; the switching mechanism is connected with the pump body; one end of the pushing mechanism is arranged outside the switching mechanism, and the other end of the pushing mechanism penetrates through the switching mechanism and is arranged in the pump body; the pushing mechanism and the pump body are enclosed to form an injection cavity; the pushing mechanism can move along the axial direction of the pushing mechanism so as to change the volume of the injection cavity;

the switching mechanism has a locking state and an unlocking state, and is capable of switching between the locking state and the unlocking state; the switching mechanism in the locked state locks the pushing mechanism to prevent axial movement of the pushing mechanism; the switching mechanism in the unlocked state releases the pushing mechanism to allow axial movement of the pushing mechanism.

Optionally, the switching mechanism includes a lock that can be driven to move relative to the pushing mechanism;

when the locking piece is abutted with the pushing mechanism, the switching mechanism is in the locking state; when the locking piece is separated from the pushing mechanism, the switching mechanism is in the unlocking state.

Optionally, the pushing mechanism comprises a push rod and a piston; the piston and part of the push rod are arranged in the pump body; one end of the push rod is fixedly connected with the piston, and the other end of the push rod penetrates through the switching mechanism and extends to the outside of the switching mechanism.

Optionally, an annular convex surface for contacting the pump body protrudes from the outer surface of the piston.

Optionally, the switching mechanism further comprises a housing, and the housing is connected with the pump body; the locking piece is arranged inside the shell; the housing is used for limiting the moving direction of the locking piece so as to enable the locking piece to move towards or away from the push rod along the radial direction of the push rod.

Optionally, the locking piece is provided with a first thread, and the pushing mechanism is provided with a second thread matched with the first thread; when the locking piece is abutted with the pushing mechanism, the pushing mechanism can rotate along the circumferential direction of the pushing mechanism so as to change the volume of the injection cavity.

Optionally, the switching mechanism further comprises a driving member; the driving piece is connected with the locking piece and used for limiting the moving position of the locking piece, one part of the driving piece is arranged inside the shell, and the other part of the driving piece protrudes outside the shell; the driving member can be moved or rotated to drive the locking member to move.

Optionally, the housing is configured to define a position of the driving member and enable rotation of the driving member relative to the housing;

the driving piece is provided with an eccentric chute penetrating along the axial direction of the driving piece, and the distance between the eccentric chute and the rotation center of the driving piece is gradually increased from one end of the eccentric chute to the other end of the eccentric chute; the locking piece comprises a protruding part which can be placed in the eccentric sliding groove; when the driving piece rotates, the eccentric sliding groove can drive the protruding part to move along the radial direction of the push rod so as to change the position of the locking piece.

Optionally, the number of the locking pieces is two, the two locking pieces are symmetrically arranged about the axis of the driving piece, the driving piece is provided with two eccentric sliding grooves, the protruding part of each locking piece is matched with a corresponding eccentric sliding groove, and the two eccentric sliding grooves are symmetrically arranged about the center of the axis of the driving piece; when the driving piece rotates, the driving piece can synchronously drive the two locking pieces to move towards the direction approaching or separating from the pushing mechanism.

Optionally, the driving piece includes sleeve and convex part, the sleeve outwards stretches out along the surface and forms the convex part, the sleeve runs through along self axial and forms eccentric spout, the sleeve sets up the inside of casing, the convex part rotationally is spacing in the outside of casing.

Optionally, the switching mechanism further includes a fixing ring, the fixing ring is fixed on the housing, and the sleeve is sleeved on the fixing ring.

Optionally, the pressure injection pump further comprises a pressure detection device for detecting the pressure in the injection cavity.

Optionally, the pressure injection pump further comprises a catheter mechanism, the catheter mechanism comprises a catheter body, two ends of the catheter body are respectively connected with the pump body and the medical balloon, and the catheter body is communicated with the injection cavity; the pushing mechanism can move along the axial direction of the pushing mechanism so as to inject substances into the medical balloon through the injection cavity.

Optionally, the catheter mechanism further comprises a catheter protection member, the catheter protection member is connected with the pump body, and the catheter protection member is sleeved outside the catheter body and is used for limiting the minimum bending angle of the catheter body.

The pressure injection pump provided by the invention comprises: the device comprises a pushing mechanism, a switching mechanism and a pump body, wherein the switching mechanism is connected with the pump body, one end of the pushing mechanism is arranged outside the switching mechanism, the other end of the pushing mechanism penetrates through the switching mechanism and is arranged in the pump body, the pushing mechanism and the pump body are enclosed to form an injection cavity, and the pushing mechanism can axially move along the pushing mechanism so as to change the volume of the injection cavity; the switching mechanism has a locking state and an unlocking state, and is capable of switching between the locking state and the unlocking state; the switching mechanism in the locked state locks the pushing mechanism to prevent axial movement of the pushing mechanism; the switching mechanism in the unlocked state releases the pushing mechanism to allow axial movement of the pushing mechanism. When the pressure injection pump is arranged in such a way, the structure of the pressure injection pump is simplified, and the operation difficulty is reduced, so that the production cost is reduced, and the operation process is simplified.

Drawings

FIG. 1 is a schematic perspective view of a pressure injection pump according to a preferred embodiment of the present invention;

FIG. 2 is a schematic axial cross-sectional view of a pressure injection pump at a first viewing angle in accordance with a preferred embodiment of the present invention;

FIG. 3 is a schematic axial cross-sectional view of a pressure injection pump at a second viewing angle in accordance with a preferred embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of the pushing mechanism and the switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in an unlocked state;

FIG. 5 is an enlarged view of a portion of the pushing mechanism and the switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in a locked state;

FIG. 6 is an enlarged view of a portion of the pushing mechanism and pump body in which the distal end of the pushing mechanism is in contact with the inner wall of the pump body, in accordance with a preferred embodiment of the present invention;

FIG. 7 is a schematic left-hand view of a driving member according to a preferred embodiment of the present invention;

FIG. 8 is an axial cross-sectional schematic view of the pushing mechanism, pump body and switching mechanism in a preferred embodiment of the invention, wherein the switching mechanism is in an unlocked state and the distal end of the pushing mechanism is in contact with the inner wall of the pump body;

FIG. 9 is an enlarged view of portion a of FIG. 8;

FIG. 10 is a schematic view showing the structure of a fixing ring according to a preferred embodiment of the present invention;

FIG. 11 is a schematic view showing a combined structure of a push rod and a part of a switching mechanism according to a preferred embodiment of the present invention;

FIG. 12 is a schematic view showing an exploded construction of a push rod and a part of a switching mechanism according to a preferred embodiment of the present invention;

FIG. 13 is an axial cross-sectional schematic view of a push mechanism, pump body and switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in an unlocked state and the push mechanism is in a pre-operative initial position;

FIG. 14 is an axial cross-sectional schematic view of a pushing mechanism, pump body and switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in an unlocked state, the pushing mechanism being in a target position when pressurizing a medical balloon;

FIG. 15 is an axial cross-sectional schematic view of a pushing mechanism, pump body and switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in a locked state, the pushing mechanism being in a target position when pressurizing a medical balloon;

fig. 16 is an axial cross-sectional schematic view of the pushing mechanism, pump body and switching mechanism in a preferred embodiment of the present invention, wherein the switching mechanism is in a locked state, and the pushing mechanism is positioned to maximize the pressure of the medical balloon.

Reference numerals are described as follows:

a pushing mechanism 1; a push rod 11; a piston 12; convex surface 121; a handle 13; a switching mechanism 2; a locking member 21; a protruding portion 211; a housing 22; a driving member 23; an eccentric chute 231; a sleeve 232; a convex portion 233; a fixing ring 24; a second through hole 241; a pump body 3; an injection cavity 4; a catheter mechanism 5; a catheter body 51; a connecting member 52; a catheter protector 53; a support 531; a pressure detection device 6.

Detailed Description

The invention is described in further detail below with reference to the drawings and the specific examples. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly, or through an intermediary, may be internal to the two elements or in an interactive relationship with the two elements, unless explicitly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In the description of the present invention, "plurality" means at least two, for example, two or three or more, etc.

As used in this specification, "distal" generally refers to the end of the pressure injection pump that is remote from the operator; the term "proximal" as opposed to "distal" generally refers to the end of the pressure injection pump that is proximal to the operator; the term "axial" refers to the direction along the axis of the pushing mechanism; the term "circumferential" refers to the circumferential direction of the axis of the pushing mechanism; the term "radial" refers to the diametrical direction of a cross-section of the pushing mechanism perpendicular to the axis.

The invention will now be described in detail with reference to the drawings and a preferred embodiment. The following embodiments and features of the embodiments may be complemented or combined with each other without conflict.

As shown in fig. 1 to 3, a preferred embodiment of the present invention provides a pressure injection pump for pressurizing or depressurizing a medical balloon (hereinafter referred to as balloon), which includes a pushing mechanism 1, a switching mechanism 2, and a pump body 3; the switching mechanism 2 is connected with the pump body 3; one end of the pushing mechanism 1 is arranged outside the switching mechanism 2, and the other end of the pushing mechanism penetrates through the switching mechanism 2 and is arranged in the pump body 3; the pushing mechanism 1 and the pump body 3 are enclosed to form an injection cavity 4 (refer to fig. 13); and the pushing mechanism 1 can move axially along itself to change the volume of the injection cavity 4.

In an embodiment, the pushing mechanism 1 can be pushed or pulled in its own axial direction to change the volume of the injection cavity 4. In another embodiment, the pushing mechanism 1 can be rotated in its own axial direction, and the pushing mechanism 1 can be moved in the axial direction relative to the pump body 3 by the rotation, thereby changing the volume of the injection chamber 4. In a further embodiment, the pushing mechanism 1 can be pushed or pulled in its own axial direction as well as rotated in its own axial direction, thereby changing the volume of the injection cavity 4.

Further, the switching mechanism 2 has a locked state and an unlocked state, and is switchable between the locked state and the unlocked state. Referring to fig. 4, the switching mechanism 2 in the locked state locks the pushing mechanism 1 to prevent axial movement of the pushing mechanism 1. The switching mechanism 2 in the unlocked state releases the pushing mechanism 1 to allow axial movement of the pushing mechanism 1. The pressure injection pump provided by the application has the advantages that the structure is simple, the number of parts is small, meanwhile, the processing technology and the assembling technology of each part are simple, so that the production cost can be reduced, and the operation process of the pressure injection pump is simplified. In addition, the pressure injection pump can control the movement or limit of the pushing mechanism by controlling the state of the switching mechanism, so that the pushing mechanism can have three working modes of pressurization, pressure maintaining and pressure relief, and the safety and reliability in the operation process can be ensured.

Referring to fig. 2, and referring to fig. 13 to 15, the pressure injection pump further includes a catheter mechanism 5, the catheter mechanism 5 includes a catheter body 51, two ends of the catheter body 51 are respectively connected with the pump body 3 and the balloon, and the catheter body 51 is communicated with the injection cavity 4. The pushing mechanism 1 is able to move axially along itself to inject a substance into the balloon through the injection lumen 4. Specifically, the catheter body 51 is fixedly connected to the pump body 3, and the manner of the fixed connection is not limited. In order to ensure that the conduit body 51 and the pump body 3 have good sealing performance after being connected, the conduit body 51 and the pump body 3 can be connected in an adhesive, interference fit or other connection mode with good sealing performance. In an example, a connector 52 (e.g., a luer connector) is provided on the catheter body 51, and the connector 52 is used to connect the catheter body 51 to the balloon to enable pressurization or depressurization of the balloon by the pressure injection pump.

Specifically, when the pressure injection pump is required to pressurize the balloon, the switching mechanism 2 is put into an unlocked state, and at this time, the pushing mechanism 1 can be pushed and/or rotated to gradually reduce the volume of the injection cavity 4, thereby pressurizing the balloon. When the pressure injection pump is needed to keep the pressure of the balloon, the switching mechanism 2 is in a locking state, and the pushing mechanism 1 is locked and cannot be pushed or pulled, so that the volume of the injection cavity 4 can be kept unchanged, and the pressure of the balloon is kept. When the pressure injection pump is needed to decompress the balloon, the switching mechanism 2 is in an unlocking state, and at the moment, the pushing mechanism 1 can be pulled and/or rotated to gradually increase the volume of the injection cavity 4, so that the balloon is decompressed.

Referring to fig. 2 and 3, the pushing mechanism 1 includes a push rod 11 and a piston 12, the piston 12 and a part of the push rod 11 are disposed inside the pump body 3, one end of the push rod 11 is fixedly connected with the piston 12, and the other end passes through the switching mechanism 2 and extends to the outside of the switching mechanism 2.

In an exemplary embodiment, the pushing mechanism 1 further comprises a handle 13, wherein the handle 13 is connected to an end of the push rod 11 remote from the piston 12, and an operator can push, pull or rotate the push rod 11 by holding and driving the handle 13.

Referring to fig. 6, in the preferred embodiment, the outer surface of the piston 12 is protruded with an annular convex surface 121 for contacting with the pump body 3, so that the piston 12 contacts with the inner wall of the pump body 3 only through the convex surface 121, so that the piston 12 has a small friction force when moving on the premise of ensuring the tightness of the piston 12 and the pump body 3, and the driving force of the operator to the pushing mechanism 1 can be reduced, so that the operator can save time and labor when driving the pressure injection pump. It should be understood that the annular convex surface 121 described above refers to a closed annular structure formed on the outer surface of the piston 12. The specific positions and numbers of the convex surfaces 121 are not limited in this application, in this embodiment, 3 annular convex surfaces 121 are formed on the outer surface of the piston 12, and in other embodiments, the number of convex surfaces 121 on the outer surface of the piston 12 may be 1, 2, 4 or more.

Referring to fig. 2 to 5, the switching mechanism 2 includes a lock 21, and the lock 21 can be driven to move relative to the pushing mechanism 1. When the lock 21 abuts against the pushing mechanism 1, the switching mechanism 2 is in the locked state. When the lock 21 is separated from the pushing mechanism 1, the switching mechanism 2 is in the unlocked state. That is, the lock 21 can be moved to a position abutting against the pushing mechanism 1 to lock the lock 21 and the pushing mechanism 1 to each other and restrict the axial movement of the pushing mechanism 1. The locking member 21 can also be moved to a position separated from the pushing mechanism 1, at which time the locking member 21 no longer restricts the pushing mechanism 1 from moving in the axial direction.

With continued reference to fig. 2 to 5, the switching mechanism 2 further includes a housing 22, the housing 22 is connected to the pump body 3, and the lock 21 is provided inside the housing 22. The housing 22 serves to define a moving direction of the locking member 21 so that the locking member 21 moves in a direction approaching or moving away from the push rod 11 in a radial direction of the push rod 11. In this embodiment, the housing 22 includes a first portion and a second portion that are fastened to each other, and the first portion and the second portion can jointly limit the moving direction of the locking member 21 after being fastened.

With continued reference to fig. 4 and 5, the switching mechanism 2 further includes a driving member 23, the driving member 23 being connected to the locking member 21 and being adapted to define a movement position of the locking member 21, a portion of the driving member 23 being disposed inside the housing 22 and another portion protruding outside the housing 22. The driving member 23 is movable or rotatable to drive the movement of the locking member 21, so that an operator can operate the position of the locking member 21 by rotating or moving the driving member 23 to switch the switching mechanism 2 between the unlocked state and the locked state.

In one embodiment, the housing 22 is configured to define the position of the driver 23 and to enable the driver 23 to rotate relative to the housing 22.

Referring to fig. 4 and 5, and in combination with fig. 7, the driving member 23 has an eccentric chute 231 penetrating in an axial direction thereof, and a distance between the eccentric chute 231 and a rotation center (not numbered) of the driving member 23 is gradually increased from one end of the eccentric chute 231 to the other end, that is, a distance between one end of the eccentric chute 231 and the rotation center of the driving member 23 is minimum, a distance between the other end of the eccentric chute 231 and the rotation center of the driving member 23 is maximum, and a distance between the eccentric chute 231 and the rotation center of the driving member 23 is gradually increased in a process of extending from one end of the eccentric chute 231 to the other end.

Referring to fig. 4 and 5, the locking member 21 includes a protrusion 211, and the protrusion 211 can be placed in the eccentric sliding groove 231. When the driving member 23 rotates, the eccentric chute 231 can drive the protrusion 211 to move in the radial direction of the push rod 11 to change the position of the locking member 21. Specifically, since the lock member 21 is restricted by the housing 22 to move only in the radial direction of the push rod 11, when the eccentric slide groove 231 of the driving member 23 rotates, the lock member 21 cannot rotate following the eccentric slide groove 231 but can only move relative to the eccentric slide groove 231. Since the different positions of the eccentric sliding groove 231 are different from the distance of the rotation center of the driving member 23, the locking member 21 can move only in the direction approaching or separating from the push rod 11 in the radial direction of the push rod 11 when the eccentric sliding groove 231 rotates.

Referring to fig. 7, in an embodiment, the driving member 23 includes a sleeve 232 and a protrusion 233, the sleeve 232 protrudes outwards along the outer surface to form the protrusion 233, the sleeve 232 penetrates through itself axially to form the eccentric chute 231, the sleeve 232 is disposed inside the housing 22, and the protrusion 233 is rotatably limited outside the housing 22. The operator can rotate the protrusion 233 to drive the eccentric chute 231 to rotate, and the eccentric chute 231 drives the locking piece 21 to be locked or separated from the push rod 11, so that the switching mechanism 2 is in the locked state or the unlocked state.

Referring to fig. 1, the housing 22 has a first through hole (not numbered) penetrating radially therethrough, through which the boss 233 protrudes outside the housing 22, the first through hole being capable of defining a rotational position of the boss 233, that is, the first through hole being capable of defining a rotational angle of the driving member 23, thereby rotating the driving member 23 within a predetermined angle. Preferably, the first through hole is disposed at a position matching the rotational position of the eccentric chute 231. Specifically, when the boss 233 is rotated to the limit position, the eccentric chute 231 is preferably rotated just to a position such that the protrusion 211 of the locking piece 21 is located at the end of the eccentric chute 231.

Referring to fig. 4 and 5, in the present embodiment, the number of locking pieces 21 is two, the two locking pieces 21 are symmetrically disposed about the axis of the driving piece 23, the driving piece 23 has two eccentric runners 231, and the protrusion 211 of each locking piece 21 is engaged with a corresponding one of the eccentric runners 231, and the two eccentric runners 231 are centrally disposed about the axis of the driving piece 23. So configured, when the driving member 23 rotates, the driving member 23 can synchronously drive the two locking members 21 to move in a direction approaching or moving away from the pushing mechanism 1. Specifically, referring to fig. 4, when the switching mechanism 2 is in the unlocked state, that is, the protrusion 233 is turned to the leftmost or rightmost side (the protrusion 233 is turned to the rightmost side in fig. 4), both the locking pieces 21 are separated from the push rod 11, and at this time, the push rod 11 can be moved or turned in the axial direction. Referring to fig. 5, when the switching mechanism 2 is in the locked state, that is, the protruding portion 233 is turned to the rightmost side or the leftmost side (the protruding portion 233 is turned to the leftmost side in fig. 5), both the lock pieces 21 abut against the push rod 11, and at this time, the push rod 11 cannot move in the axial direction. It should be understood that the number of locking members 21 and eccentric runners 231 is not limited in this application, and in other embodiments, the number of locking members 21 and eccentric runners 231 may be 1, 3, 4, or more.

As a preferred embodiment, the locking member 21 is provided with a first thread and the push rod 11 is provided with a second thread cooperating with said first thread, so that the first thread of the locking member 21 can cooperate with the second thread of the push rod 11 when the locking member 21 abuts against the push rod 11. Since the position of the locking member 21 is locked by the eccentric chute 231 from moving in the radial direction of the push rod 11 when the first screw is coupled with the second screw, the locking member 21 can restrict the push rod 11 from moving in the axial direction.

In the present embodiment, the locking member 21 is a slider, and a cylindrical protrusion 211 capable of matching with the eccentric chute 231 protrudes toward the side of the driving member 23, and the side of the slider toward the push rod 11 has the first thread, and the second thread is provided on the outer surface of the push rod 11.

Because the existing pressure injection pump generally realizes pressurization and pressure relief of the balloon only by pushing or pulling the push rod, when the pressure in the balloon is high, the push rod often cannot be pushed because of high driving force required to continue pushing, so that an operator cannot continue to pressurize the balloon. In addition, when the balloon is pressurized or depressurized by pushing or pulling the push rod, the conventional pressure injection pump cannot accurately control the pressure in the balloon because the moving distance of the push rod cannot be accurately controlled. In addition, in the pressure maintaining stage of the balloon, the push rod is free of a limiting structure and is easy to axially move, so that the actual pressure in the pressure maintaining stage of the balloon can be changed, and the progress and accuracy of an operation are affected. In summary, the existing pressure injection pump generally has the problems of inaccurate pressure control in the process of pressurizing or depressurizing the balloon, poor pressure stability in the balloon in the process of maintaining the pressure of the balloon, and the like. The push rod 11 can not axially move in the balloon pressure maintaining stage through the threaded fit of the locking piece 21 and the push rod 11, so that the pressure of the balloon in the pressure maintaining stage can be ensured to be unchanged.

Further, when the lock 21 abuts against the pushing mechanism 1, the pushing mechanism 1 can be rotated in its own circumferential direction to change the volume of the injection cavity 4. Therefore, the pressure injection pump provided by the application can enable the switching mechanism 2 to be in a locking state when the pressure in the balloon is high and the push rod 11 cannot be pushed, and in this state, an operator can further pressurize the balloon by rotating the push rod 11, so that the balloon can reach a preset pressure by rotating the push rod 11. In addition, because the push rod 11 moves in the axial direction slowly when rotating, the actual pressure in the saccule can be accurately controlled by slowly rotating the push rod 11, and the high-precision pressurization or pressure relief of the pressure injection pump under larger pressure can be realized, so that the pressure injection pump has higher control precision in the pressurization, pressure maintaining and pressure relief processes, the expansion process of the saccule can be accurately controlled, the success rate of operation is improved, and the safety and reliability in the operation process are improved.

Referring to fig. 1, the pump body 3 is preferably further provided with graduation marks (not numbered) which can display the moving position of the piston 12, and an operator can know and control the moving distance of the push rod 11 through the graduation marks, so as to precisely control the pressure in the balloon.

In a preferred embodiment, the housing 22 is provided with a locking mechanism for limiting the position of the protruding portion 233, and when the protruding portion 233 rotates to a position where the switching mechanism 2 is in the unlocked state, the protruding portion 233 can be limited by the locking mechanism and cannot easily rotate, so that the unlocked state of the switching mechanism 2 can be locked, so that the unlocked state of the switching mechanism 2 is prevented from being changed due to misoperation of an operator. When the switching mechanism 2 needs to be changed to the locked state, the operator needs to rotate the boss 233 to a position where the switching mechanism 2 is in the locked state. It should be noted that, when the switching mechanism 2 is in the locked state, the self-locking property between the first thread of the locking member 21 and the second thread of the push rod 11 can limit the position of the protruding portion 233 so as to automatically lock the locked state of the switching mechanism 2, so that the change of the locked state of the switching mechanism 2 caused by the misoperation of an operator can be avoided.

Referring to fig. 8 to 12, the switching mechanism 2 further includes a fixing ring 24, the fixing ring 24 is fixed to the housing 22, and a sleeve 232 is sleeved on the fixing ring 24. In this embodiment, the fixing ring 24 is also a sleeve structure, the fixing ring 24 is limited by the housing 22 so that it cannot move relative to the housing 22, and the sleeve 232 can support the fixing ring 24 and can rotate relative to the fixing ring 24. The fixing ring 24 has a second through hole 241 penetrating radially therethrough, and the locking member 21 can pass through the second through hole 241 so as not to interfere with the fixing ring 24 when moving.

Referring to fig. 1 to 3, the catheter mechanism 5 further includes a catheter protector 53, wherein the catheter protector 53 is connected to the pump body 3, and the catheter protector 53 is sleeved outside the catheter body 51 and is used for defining a minimum bending angle of the catheter body 51. In the present embodiment, the pipe protector 53 is connected to an end of the pump body 3 remote from the switching mechanism 2, the pipe protector 53 having a third through hole penetrating axially, the pipe body 51 being disposed in the third through hole.

In an example, the inner wall of the third through hole facing the balloon is in a horn shape, and the inner diameter of the third through hole is the largest at the end of the catheter protection member 53, so that the bendable angle of the catheter body 51 is smaller than 90 ° when the catheter body 51 is bent, thereby limiting the bending angle of the catheter body 51, eliminating the risk of excessive bending of the catheter body 51, and further avoiding damage to the catheter body 51 due to excessive bending angle.

Referring to fig. 2 and 3, the catheter protector 53 is preferably provided with a support member 531, and the support member 531 can support the catheter protector 53 and assist in positioning the pressure injection pump, for example, the support member 531 of the catheter protector 53 can be abutted against an operating table during operation, so that an operator can apply force to the operating table to pressurize the balloon.

Preferably, the pressure injection pump further comprises a pressure detecting device 6 (refer to fig. 1 and 3) for detecting the pressure in the injection cavity 4, and an operator can know the actual pressure in the balloon through the pressure detecting device 6 and control the moving or rotating position of the push rod 11 according to the actual pressure in the balloon so as to enable the actual pressure of the balloon to reach the preset pressure. In the present embodiment, the pressure detecting device 6 is a pressure gauge that can be installed at an arbitrary position communicating with the injection chamber 4, for example, the pressure gauge can be installed on the pump body 3. The connection mode between the pressure gauge and the pump body 3 is not limited, and the pressure gauge and the pump body 3 can be connected in an adhesive mode, an interference fit mode or other connection modes with good sealing performance, so that the sealing performance of the injection cavity 4 is ensured.

For any of the above embodiments, in one non-limiting operation, the operation of the pressure injection pump to expand the balloon is:

1) Referring to fig. 8, the plunger 11 is moved to a distal-most position prior to the start of the procedure to minimize the volume of the injection cavity 4. During the operation, the switching mechanism 2 is unlocked by rotating the protruding portion 233, and the operator pulls the push rod 11 to a predetermined position (for example, the proximal end), sucks a target solution such as a contrast solution or a physiological saline solution through the catheter, and fills the pump body 3 with the liquid (see fig. 13). The catheter body 51 is then connected to the balloon ready for inflation, and the catheter protector 53 is brought into abutment with the operating table to assist the operator in applying force, thus completing the preparation before pressurization of the pressure injection pump.

2) After the pressure injection pump is connected and fixed to the balloon, the push rod 11 is pushed in the distal direction to a position where it is difficult to continue pushing or a position where the actual pressure of the balloon is brought close to the preset pressure (refer to fig. 14). The turning protrusion 233 brings the switching mechanism 2 into a locked state (see fig. 15), and the pressure in the balloon is stabilized due to the self-locking property when the first screw of the locking member 21 and the second screw of the push rod 11 are engaged.

3) If the pressure in the balloon needs to be continuously increased or precisely controlled, the operator can rotate the push rod 11 to continuously slowly pressurize the balloon, and precisely control the actual pressure in the balloon through the pressure detection device 6, so that the pressure in the balloon is slowly and stably increased in speed in the process.

When the actual pressure value in the balloon reaches the preset pressure value, pushing or rotating of the push rod 11 is stopped, and the locking state of the switching mechanism 2 is continuously maintained (refer to fig. 16), at this time, the pressure in the balloon can be maintained for a period of time due to the self-locking property of the locking piece 21 and the push rod 11 and the tightness of the system, and the operator can continuously complete the operation.

4) When the operation is completed, the convex portion 233 is rotated to switch the switching mechanism 2 to the unlocked state, and the operator pulls the push rod 11 proximally to completely withdraw the target liquid in the balloon, so that the pressure release of the balloon can be realized.

In conclusion, the pressure injection pump provided by the invention has the advantages of simple structure, convenience in operation, capability of reducing the production cost and simplicity in operation process of surgery. Meanwhile, the pressure injection pump has higher control precision on the pressurizing, pressure maintaining and pressure releasing processes, and can accurately control the expanding process of the saccule, so that the success rate of the operation can be improved, and the safety and reliability in the operation process can be improved.

The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present invention.

Claims

1. The pressure injection pump is used for pressurizing or depressurizing the medical balloon and is characterized by comprising a pushing mechanism, a switching mechanism and a pump body; the switching mechanism is connected with the pump body; one end of the pushing mechanism is arranged outside the switching mechanism, and the other end of the pushing mechanism penetrates through the switching mechanism and is arranged in the pump body; the pushing mechanism and the pump body are enclosed to form an injection cavity; the pushing mechanism can move along the axial direction of the pushing mechanism so as to change the volume of the injection cavity;

2. The pressure injection pump of claim 1, wherein the switching mechanism comprises a lock that is drivable to move relative to the pushing mechanism;

3. The pressure injection pump of claim 2 wherein said pushing mechanism comprises a push rod and a piston; the piston and part of the push rod are arranged in the pump body; one end of the push rod is fixedly connected with the piston, and the other end of the push rod penetrates through the switching mechanism and extends to the outside of the switching mechanism.

4. A pressure injection pump according to claim 3, wherein the piston has an annular convex surface protruding from its outer surface for contact with the pump body.

5. A pressure injection pump as claimed in claim 3, wherein the switching mechanism further comprises a housing, the housing being connected to the pump body; the locking piece is arranged inside the shell; the housing is used for limiting the moving direction of the locking piece so as to enable the locking piece to move towards or away from the push rod along the radial direction of the push rod.

6. A pressure injection pump according to claim 2, wherein the locking member is provided with a first thread and the pushing mechanism is provided with a second thread cooperating with the first thread; when the locking piece is abutted with the pushing mechanism, the pushing mechanism can rotate along the circumferential direction of the pushing mechanism so as to change the volume of the injection cavity.

7. The pressure injection pump of claim 5, wherein the switching mechanism further comprises a driver; the driving piece is connected with the locking piece and used for limiting the moving position of the locking piece; one part of the driving piece is arranged inside the shell, and the other part of the driving piece protrudes outside the shell; the driving member can be moved or rotated to drive the locking member to move.

8. The pressure injection pump of claim 7 wherein said housing is adapted to define the position of said drive member and enable rotation of said drive member relative to said housing;

9. The pressure injection pump of claim 8 wherein the number of said locking members is two, said locking members being symmetrically disposed about the axis of said driving member, said driving member having two said eccentric runners, the projection of each said locking member engaging a corresponding one of said eccentric runners, said eccentric runners being centrally disposed about the axis of said driving member; when the driving piece rotates, the driving piece can synchronously drive the two locking pieces to move towards the direction approaching or separating from the pushing mechanism.

10. The pressure injection pump of claim 8 wherein said drive member comprises a sleeve and a boss, said sleeve projecting outwardly along an outer surface to form said boss, said sleeve extending axially therethrough to form said eccentric runner, said sleeve being disposed within said housing, said boss being rotatably retained on the exterior of said housing.

11. The pressure injection pump of claim 10, wherein the switching mechanism further comprises a retaining ring secured to the housing, the sleeve being disposed over the retaining ring.

12. A pressure injection pump according to any of claims 1-11, further comprising pressure detection means for detecting the pressure in the injection chamber.

13. The pressure injection pump of any one of claims 1-11, further comprising a catheter mechanism comprising a catheter body, both ends of the catheter body being connected to the pump body and the medical balloon, respectively, the catheter body being in communication with the injection lumen; the pushing mechanism can move along the axial direction of the pushing mechanism so as to inject substances into the medical balloon through the injection cavity.

14. The pressure injection pump of claim 13 wherein the catheter mechanism further comprises a catheter protector, the catheter protector being coupled to the pump body, the catheter protector being disposed about an exterior of the catheter body and configured to define a minimum bend angle of the catheter body.