WO2022242450A1

WO2022242450A1 - Push rod assembly and medical device

Info

Publication number: WO2022242450A1
Application number: PCT/CN2022/090375
Authority: WO
Inventors: 杨波; 张广建; 王洪杰; 刘梦钦; 郭澜涛; 苗铮华
Original assignee: 上海鸿脉医疗科技有限公司
Priority date: 2021-05-21
Filing date: 2022-04-29
Publication date: 2022-11-24
Also published as: CN115381512A

Abstract

A push rod assembly and a medical device. The medical device comprises the push rod assembly and a medical implant. The push rod assembly comprises: a push rod (100), having a first inner cavity; a position-limiting mechanism (200), comprising a first sub position-limiting mechanism (210) and a second sub position-limiting mechanism (220), the first sub position-limiting mechanism (210) being provided at the proximal end of the medical implant, having a first position-limiting area (211) formed thereon, and comprising a first blocking portion (212), the first blocking portion (212) being provided at the proximal end of the first position-limiting area (211), a first through hole (213) being formed in the first blocking portion (212), and the second sub position-limiting mechanism (220) being connected to the distal end of the push rod (100); and a control rod (300), when the distal end of the control rod (300) passes through the first inner cavity and the first through hole (213) and the distal portion of the second sub position-limiting mechanism (220) is limited within the first position-limiting area (211), the push rod assembly being in a locked position, and when the control rod (300) moves along the axial direction of the first through hole (213) to allow the distal portion of the second sub position-limiting mechanism (220) to be separated from the first position-limiting area (211), the push rod assembly being in an unlocked position. When the push rod assembly is used to push a medical implant, the precision of positioning for the medical implant can be improved.

Description

A push rod assembly and medical device

technical field

The invention relates to the technical field of medical devices, in particular to a push rod assembly and a medical device.

Background technique

Cardiovascular disease has become the number one killer threatening human health, including various vascular access abnormalities such as hemangioma, dissection, embolism, and stenosis. For vascular diseases such as hemangioma or dissection, embolization coils can be used for embolization therapy. An embolic coil is a permanently implanted wire-wound structure that, when implanted in a diseased area, can form a thrombus in the diseased area to form an embolized blood vessel. In order to be able to embolize blood vessels of different diameters, the embolic coils can have different lengths or different diameters. During use, the embolic coil is connected to the push rod assembly in the slender form of the primary spring and fixed in the introduction sheath. The loop is pushed into the target area of the blood vessel for release. After the embolic coil is released, it transforms from a primary spring to a complex 3D shape, such as a spiral, diamond, spherical, etc. Embolic coils are highly flexible and capable of delivery through narrow or tortuous vessel structures, but when closure of larger diameter vessels is required, multiple embolic coils may be required.

In the operation of pushing and releasing the embolic coil, there are many uncertain factors that may cause the coil to not be well positioned in the blood vessel, thereby causing inaccurate release positions, and once the push assembly in the prior art pushes the embolic coil After advancing out of the catheter and into the blood vessel, it is difficult to withdraw the embolic coil, and it is also difficult to reposition the embolic coil.

Contents of the invention

The purpose of the present invention is to provide a push assembly and a medical device. When the push assembly is used to push the medical implant, the medical implant can still be recovered and repositioned after entering the blood vessel, which is beneficial to improve the treatment effect.

To achieve the above object, the present invention provides a push rod assembly, comprising:

The push rod has a first inner cavity axially penetrated;

The limiting mechanism includes a first sub-limiting mechanism and a second sub-limiting mechanism; the first sub-limiting mechanism is formed with a first limiting area, and also includes a first stop, the first stop It is arranged at the proximal end of the first limiting area, and the first stop part is provided with a first through hole communicating with the first limiting area; the second sub-limiting mechanism is connected to the the distal end of the push rod; and,

Controller;

The push rod assembly is configured such that when the distal end of the control rod passes through the first inner cavity and the first through hole, and is connected with the distal end portion of the second sub-limiting mechanism, and will When the distal part of the second sub-limiting mechanism is limited in the first limiting area, the push rod assembly is in the locked position; when the control rod moves along the axial direction of the first through hole, And when the distal part of the second sub-limiting mechanism is allowed to break away from the first limiting area, the push rod assembly is in the unlocked position.

Optionally, the first limiting area is formed on the side of the first sub-limiting mechanism, and is radially inwardly recessed; the side of the second sub-limiting mechanism is formed with a The second limiting area is recessed inside, and also includes a second stopper, the second stopper is arranged at the distal end of the second limiting area and constitutes the distal part of the second sub-limiting mechanism, A second through hole is provided on the second blocking portion, and the second through hole, the second limiting area and the first inner cavity are sequentially communicated with each other;

When the push rod assembly is in the locked position, the control rod also constrains the first stop part in the second limiting area, and the distal end of the control rod also passes through the first Two through holes; when the control rod moves in the direction from the distal end to the proximal end and the distal end of the control rod is located on the proximal side of the second limiting area, the push rod assembly is in the The unlocked position also allows the first blocking part to disengage from the second limiting area.

Optionally, the second sub-limiting mechanism further includes a first engaging portion, the first engaging portion is located at the proximal end of the second limiting area and is connected to the distal end of the push rod; A third through hole is provided on the first joint portion, and the third through hole communicates with the first inner cavity and the second limiting area, and is used for the distal end of the control rod to pass through.

Optionally, the push rod assembly is used to movably pass through the second lumen of a catheter, so as to deliver a medical implant to a target position.

Optionally, the ratio of the sum of the width of the first blocking portion and the width of the second blocking portion to the diameter of the second inner cavity ranges from 1 to 1.5.

Optionally, the second sub-limiting mechanism includes a deformation part, the deformation part is arranged around the control rod, and the proximal end of the deformation part is connected to the first connection point on the push rod, so The distal end of the deformation part is connected to the second connection point on the control rod; the distal part of the deformation part is the distal part of the second sub-limiting mechanism;

The push rod assembly is configured when the distal portion of the deformation part passes through the first through hole and is located in the first limiting area, and the axis between the second connection point and the first connection point When the distance in the radial direction is less than a predetermined value, the distal end portion of the deformation portion is radially expanded to a radial maximum dimension larger than the diameter of the first through hole, so that the distal end portion of the deformation portion is restricted within the first limit. In the position zone, when the control rod moves in the direction from the proximal end to the distal end and makes the axial distance from the second connection point to the first connection point equal to the predetermined value, the deformation part The distal end portion of the deformation portion is radially contracted to a radial dimension smaller than or equal to the diameter of the first through hole, so as to allow the distal end portion of the deformation portion to break away from the first limiting area.

Optionally, the deformation part includes a plurality of elastic pieces, and the plurality of elastic pieces are sequentially arranged around the control rod; or, the deformation part is an elastic sleeve, and is sleeved on the outside of the control rod.

Optionally, the first sub-limiting mechanism has a third inner cavity, and the third inner cavity constitutes the first limiting area.

Optionally, the push rod is braided from wire.

Optionally, the diameter of the control rod is 50%-60% of the diameter of the first through hole.

Optionally, the first sub-limiting mechanism further includes a second engaging portion disposed at a distal end of the first limiting area.

To achieve the above object, the present invention also provides a medical device, including a medical implant and the push rod assembly as described in any one of the preceding items, the first sub-limiting mechanism is used to connect to the medical implant the proximal end.

Optionally, the medical implant includes an embolic coil.

Compared with the prior art, the pushing assembly and the medical device of the present invention have the following advantages:

The foregoing medical device includes a medical implant and a push rod assembly; the push rod assembly includes a push rod, a limit mechanism and a control rod; the push rod has a first inner cavity axially penetrated; the limit mechanism includes The first sub-limiting mechanism and the second sub-limiting mechanism; the first sub-limiting mechanism is connected to the proximal end of the medical implant, and a first limiting area is formed thereon, and also includes a first stop part, the first stop part is arranged at the proximal end of the first limit area, and the first stop part is provided with a first through hole communicating with the first limit area; the second The sub-limiting mechanism is connected to the distal end of the push rod; the push rod assembly is configured such that when the distal end of the control rod passes through the first inner cavity and the first through hole, and is connected with the When the distal part of the second sub-limiting mechanism is connected and the distal part of the second sub-limiting mechanism is limited in the first limiting area, the push rod assembly is in a locked position; when the control When the rod moves axially along the first through hole and allows the distal portion of the second sub-limiting mechanism to disengage from the first limiting area, the push rod assembly is in the unlocked position. That is to say, when the medical implant is pushed by the push rod assembly, as long as the push rod assembly is in the locked position, the medical implant is controlled by the push rod, even if the Once the medical implant has entered the blood vessel, it can still be recovered and repositioned through the push rod, so as to improve the positioning accuracy of the medical implant. Not only that, through the cooperation of the control rod and the limiting mechanism, it is also avoided that the first sub-limiting mechanism and the second sub-limiting mechanism occur when the medical implant is pushed through the curved part of the blood vessel. In the case of early separation, the reliability of the push rod is improved.

Description of drawings

The accompanying drawings are used to better understand the present invention, and do not constitute improper limitations to the present invention. in:

Fig. 1 is a schematic structural view of the push rod assembly provided according to Embodiment 1 of the present invention, in which the first sub-limiting mechanism is connected to the medical implant;

Fig. 2 is a schematic structural view of the first sub-limiting mechanism of the push rod assembly provided according to Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the connection relationship between the first sub-limiting mechanism of the push rod assembly and the medical implant according to Embodiment 1 of the present invention;

Fig. 4 is a schematic structural view of the second sub-limiting mechanism of the push rod assembly provided according to Embodiment 1 of the present invention;

Fig. 5 is a schematic diagram of the connection relationship between the second sub-limiting mechanism, the push rod and the control rod of the push rod assembly provided by the first embodiment of the present invention;

Fig. 6 is a schematic view of the use scene of the push rod assembly provided according to the first embodiment of the present invention, in which the push rod assembly is in the locked position, and the proximal end of the medical implant is located in the second lumen of the catheter;

Fig. 7 is a schematic diagram of the use scene of the push rod assembly provided according to the first embodiment of the present invention, which shows that the proximal end of the medical implant is located outside the catheter, and the push rod assembly is still in the locked position;

Fig. 8 is a schematic view of the use scene of the push rod assembly provided according to Embodiment 1 of the present invention. It shows that the proximal end of the medical implant is located outside the catheter, the push rod assembly is in the unlocked position, and the first stop can be disengaged from the first limit. Position zone, the second gear can break away from the second limit zone;

Fig. 9 is a schematic diagram of the use scene of the push rod assembly provided according to the second embodiment of the present invention, in which the push rod assembly is in the locked position, and the proximal end of the medical implant is located in the second lumen of the catheter;

Fig. 10 is a schematic diagram of the use scene of the push rod assembly provided according to the second embodiment of the present invention, in which the push rod assembly is in the locked position, and the proximal end of the medical implant is located outside the catheter;

Fig. 11 is a schematic view of the use scene of the push rod assembly provided according to the second embodiment of the present invention, in which the push rod assembly is in the unlocked position, and the distal part of the second sub-limiting mechanism is located in the first limiting area ;

Fig. 12 is a schematic view of the use scene of the push rod assembly provided by the second embodiment of the present invention. In the illustration, the push rod assembly is in the unlocked position, and the distal part of the second sub-limiting mechanism is out of the first limiting area.

[the reference signs are explained as follows]:

1 - conduit;

10-Embolic coil;

100-push rod, 200-limiting mechanism, 210-first sub-limiting mechanism, 211-first limiting area, 212-first stop, 213-first through hole, 214-second joint, 215 - the fourth through hole, 220 - the second sub-limiting mechanism, 221 - the second limiting area, 222 - the second blocking part, 223 - the second through hole, 224 - the first joint part, 225 - the third through hole , 300-control lever.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

In addition, each embodiment of the content described below has one or more technical features respectively, but this does not mean that the inventor must implement all the technical features in any embodiment at the same time, or can only implement different embodiments separately. Some or all of the technical features. In other words, on the premise that the implementation is possible, those skilled in the art can selectively implement some or all of the technical features in any embodiment according to the disclosure of the present invention and depending on design specifications or implementation requirements, or Selectively implement a combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural objects, and the plural form "a plurality" includes two or more objects, unless the content clearly states otherwise. As used in this specification, the term "or" is generally used in the sense including "and/or", unless the content clearly indicates otherwise, and the terms "install", "connect" and "connect" should be To understand it in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two elements or the interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The core idea of the present invention is to provide a push rod assembly, which is used to connect with a medical implant, and push the medical implant to the target position of the target area in the patient's body along a catheter to carry out freed. The push rod assembly includes a push rod, a limit mechanism and a control rod. Wherein, the push rod has a first inner cavity axially penetrated; the limiting mechanism includes a first sub-limiting mechanism and a second sub-limiting mechanism. The first sub-limiting mechanism is used to connect to the proximal end of the medical implant, the first sub-limiting mechanism is formed with a first limiting area, and also includes a first stop portion, the first sub-limiting mechanism A blocking portion is arranged at the proximal end of the first limiting area, and a first through hole communicating with the first limiting area is formed on the first blocking portion. The second sub-limiting mechanism is connected to the distal end of the push rod. The push rod assembly is configured such that when the distal end of the control rod passes through the first inner chamber and the first through hole and is connected with the distal end portion of the second sub-limiting mechanism, and the When the distal part of the second sub-limiting mechanism is limited in the first limiting area, the push rod assembly is in a locked state, and at this time the push rod passes through the limiting mechanism and the medical implant Things stay connected. When the control rod moves axially along the first through hole and allows the distal part of the second sub-limiting mechanism to break away from the first limiting area, the push rod assembly is in an unlocked state, In this case the medical implant is decoupled from the push rod or both are allowed to be decoupled. That is to say, when the push rod assembly is pushing the medical implant, as long as the push rod assembly is kept at the locked position, even if the medical implant has been completely pushed out of the guide tube (i.e. The proximal end of the medical implant has broken away from the catheter), the push rod can still be used to reclaim the medical implant and adjust the position of the medical implant to improve the medical implant The positioning accuracy of drug release is conducive to improving the therapeutic effect. In the embodiment of the present invention, the medical implant generally refers to an embolism coil.

In order to make the purpose, advantages and features of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

In this context, the terms "proximal", "distal" refer to the relative orientation, relative position, direction of elements or actions relative to each other from the perspective of a doctor using the medical device, although "proximal", "distal ” is not limiting, but “proximal” generally refers to the end of the medical device that is closest to the practitioner during normal operation, and “distal” generally refers to the end that enters the patient first.

Fig. 1 shows a schematic structural view of the push rod assembly provided by this embodiment. As shown in FIG. 1 , the push rod assembly includes a push rod 100, a limiting mechanism 200 and a control rod 300. The push rod 100 has a first inner cavity axially penetrating. The limiting mechanism 200 includes a first sub-limiting mechanism 210 and a second sub-limiting mechanism 220 . Wherein, the first sub-limiting mechanism 210 is provided with a first limiting area 211, and also includes a first blocking portion 212, and the first blocking portion 212 is arranged at the proximal end of the first limiting area 211. , and the first stop portion 212 is provided with a first through hole 213 communicating with the first limiting area 211 . The second sub-limiting mechanism 220 is connected to the distal end of the push rod 100 . The control rod 300 is configured to be movably passed through the first inner cavity and the first through hole 213 .

The first sub-limiting mechanism 210 of the push rod assembly is used to be connected to the proximal end of a medical implant such as the embolic coil 10, and is used to push the embolic coil along the second lumen of a catheter 1. 10 is pushed and released to the target location in the target blood vessel in the patient.

The push rod assembly has a locked position and an unlocked position. When the push rod assembly is in the locked position, the distal end portion of the second sub-limiting mechanism 220 is located inside the first limiting area 211, and the distal end of the control rod 300 passes through the The first inner chamber and the first through hole 213 are also connected to the distal part of the second sub-limiting mechanism 220, so that the distal part of the second sub-limiting mechanism 220 is limited to the inside the first limiting area 211, and prevent the distal part of the second sub-limiting mechanism 220 from breaking away from the first limiting area, so that the second sub-limiting mechanism 220 and the first sub-limiting mechanism 220 The mechanism 210 remains connected so that the operator can control the embolic coil 10 through the push rod 100 and adjust the position of the embolic coil 10 at any time. When the control rod 300 moves axially along the first through hole 213 to a position allowing the distal end portion of the second sub-limiting mechanism 220 to disengage from the first limiting area 211, the push rod assembly in the unlocked position. At this time, the second sub-limiting mechanism 220 can be disconnected from the first sub-limiting mechanism 210, and then the embolism coil 10 (carrying the first sub-limiting mechanism 210) can be separated from the push button. Rod 100. The advantage of this push rod assembly is that as long as the push rod assembly is kept at the locking position, in the process of releasing the embolic coil 10, once the operator finds that the position of the embolic coil 10 is not good, Even if the embolic coil 10 has been completely pushed out of the catheter 1, the embolic coil 10 can still be recovered into the catheter 1 and the position of the embolic coil 10 can be readjusted by operating the push rod assembly After releasing, it is beneficial to improve the positioning accuracy of the embolic coil 10 and improve the therapeutic effect. Not only that, at the bending position of the blood vessel, the cross-section of the catheter 1 will be deformed from a circular shape to an ellipse, resulting in an increase in the radial dimension of the cross-section of the catheter 1 in a certain direction. When the push rod assembly pushes the embolism coil 10 through the bending position, the push rod assembly is in the locked position under the presence of the control rod 300, avoiding the first sub-limit mechanism 210 and The second sub-limiting mechanism 220 is separated in advance due to the change of the radial dimension of the cross-section of the catheter 1 at the bending area (that is, the distal end portion of the second sub-limiting mechanism 220 breaks away from the The above-mentioned first limiting area 211) improves the reliability of the push rod assembly.

Preferably, the push rod 100 can be a tubular structure formed by helically braiding metal wires or cut from a metal tube, which has good flexibility and cornering performance, and can reduce stagnation, Probability of occurrence of discounts etc. The control rod 300 is generally made of a single strand of metal wire, and its diameter may be 50% to 60% of the diameter of the first through hole 213, which not only makes the push rod assembly have better overall flexibility, It also makes the movement space of the control rod 300 smaller in the radial direction, thereby reducing the shaking range of the first sub-limit mechanism 210 and the embolism coil 10 when pushing.

Please refer to FIG. 2 , a radially inwardly recessed groove is formed on the side of the first sub-limiting mechanism 210 , and the groove can serve as the first limiting area 211 . Further, the first sub-limiting mechanism 210 also includes a second engaging portion 214, the second engaging portion 214 is arranged at the distal end of the first limiting area 211, and constitutes the distal end of the groove side wall. The second engaging portion 214 is used to connect with the proximal end of the embolic coil 10 (as shown in FIG. 3 ). In this embodiment, the first blocking portion 212 , the first limiting area 211 and the second joint portion 214 can be formed simultaneously by removing a part of material in the middle area of a cylinder. It can be understood that when the cross-section of the cylinder is larger than the cross-section of the embolic coil 10, the distal end of the second engaging portion 214 can be formed such that the cross-section gradually decreases from the proximal end to the distal end. The conical head, and the distal end surface of the conical head matches the cross section of the embolic coil 10 . In addition, preferably, the second joint portion 214 is provided with a fourth through hole 215 communicating with the first limiting area 211 and the inner cavity of the embolic coil 10 .

Please refer to FIG. 4 , on the side of the second sub-limiting mechanism 220 is formed a second limiting area 221 radially inwardly recessed, and the second limiting area 221 is aligned with the first limiting area of the push rod 100 . The lumen is connected. The second sub-limiting mechanism 220 also includes a second stopper 222, the second stopper 222 is arranged at the distal end of the second limiter area 221, and the second stopper 222 constitutes the second limiter. The distal portion of the bit mechanism 220. The second blocking portion 222 is provided with a second through hole 223 , and the second through hole communicates with the second limiting area 221 . Further, the second sub-limiting mechanism 220 also includes a first joint portion 224, which is arranged at the proximal end of the second limiting area 221 and connected with the push rod 100 (as shown in FIG. 5 ). The first joint portion 224 is provided with a third through hole 225 , and the third through hole 225 is used to communicate with the first inner cavity and the second limiting area 221 . Similar to the first sub-limiting mechanism 210, the second sub-limiting mechanism 220 can also simultaneously form the second stopper 222 and the second limiting mechanism by removing a part of material in the middle area of a cylinder. The bit area 221 and the first bonding portion 224 .

When the push rod assembly and the plug spring ring 10 are assembled, and the push rod assembly is in the locked position, the first stopper 212 is located in the second limiting area 221, and the second The blocking part 222 (that is, the distal part of the second sub-limiting mechanism 220) is located in the first limiting area 211, and the distal end of the control rod 300 passes through the first inner cavity, the The third through hole 225, the first through hole 213, the second through hole 223, and preferably through the fourth through hole 215, so that the second blocking portion 222 is limited in the first within the limiting area 211 , and limit the first blocking portion 212 within the second limiting area 221 . Optionally, the distal end of the control rod 300 can also extend into the lumen of the embolic coil 10 . For the convenience of assembly, in this embodiment, preferably, the first through hole 213 and the fourth through hole 215 extend along the axial direction of the first sub-limiting mechanism 210, and the second through hole 223 and the The third through hole 225 extends along the axial direction of the second sub-limiting mechanism 220 .

Use the push rod assembly to push the embolic coil 10 to the target position in the body along the second lumen of the catheter 1 (at this time, the embolic coil 10 is completely located outside the catheter 1), and The operator can pull the control rod 300 in the direction from the distal end to the proximal end, and when the control rod 300 is retracted until its distal end is on the proximal side of the second limiting area 221, the push rod When the assembly is in the unlocked position, the second stopper 222 can break away from the first limiting area 211, the first stopper 212 can break away from the second limiting area 221, and the embolism coil 10 is separated from the push rod 100 together with the first sub-limiting mechanism 210 .

Optionally, in this embodiment, the ratio of the sum of the width of the first blocking portion 212 and the width of the second blocking portion 222 to the diameter of the second lumen of the catheter 1 is (1˜1.5) , for example the ratio is 1.1, 1.2, 1.3 or 1.4 etc. So set, on the one hand, it can ensure that the push rod assembly can push the embolism coil 10 to move along the second inner cavity; Bit mechanism 220 has sufficient strength. It can be understood that the width of the first blocking portion 212 is the depth of the first limiting area 211, the width of the second blocking portion 222 is the depth of the second limiting area 221, and the first The depth of the limiting area 211 and the second limiting area 221 refers to the size of the corresponding limiting area in the radial direction of the push rod assembly.

Next, the process of pushing and releasing the embolism coil 10 by the push rod assembly will be described.

Firstly, the push rod assembly and the embolism coil 10 are assembled, and the push rod assembly is in the locked position.

Then, the embolic coil 10 is introduced into the second lumen of the catheter 1 pre-implanted in the patient's body by using a sheath.

Afterwards, the operator applies a pushing force to the push rod assembly at the proximal end of the push rod 100, and pushes the embolic coil 10 to the target position in the body along the second lumen of the catheter 1 , and push the embolic coil 10 to the outside of the catheter 1 (as shown in FIG. 6 and FIG. 7 ), when the embolic coil 10 is completely outside the catheter 1 (as shown in FIG. 7 shown), if the embolic coil 10 has been correctly positioned, the operator can apply a retraction force on the proximal end of the control rod 300, so that the control rod 300 moves from the distal end to the proximal end to The proximal side of the second limiting area 221 moves into the first inner cavity of the push rod 100 (as shown in FIG. 8 ), so that the push rod assembly is in the unlocked position, and at this time The second blocking portion 222 can disengage from the first limiting area 211 , and the first blocking portion 212 can disengage from the second limiting area 221 to realize the release of the embolic coil 10 . Before switching the push rod assembly to the unlocked position, if the position of the embolic coil 10 deviates from the target position, the operator can apply a retraction force on the proximal end of the push rod 100 to push the The embolic coil 10 is recovered into the second inner cavity, and released again after the position of the embolic coil 10 is adjusted.

Further, this embodiment also provides a medical device, including the medical implant such as the embolic coil 10 and the push rod assembly, the first sub-limiting mechanism 210 of the push rod assembly is connected to The proximal end of the medical implant.

The difference between this embodiment and the first embodiment mainly lies in the structure of the second sub-limiting mechanism. Please refer to FIG. 9 to FIG. 12 , in this embodiment, the second sub-limiting mechanism 220 includes a deformation part, the deformation part is arranged around the control rod 300, and the proximal end of the deformation part is connected to the At the first connection point on the push rod 100 , the distal end of the deformation part is connected to the second connection point on the control rod 300 . Preferably, the first connection point is located at the distal end of the push rod 100 and the second connection point is located at the distal end of the control rod 300 . In this way, the distal portion of the deformation portion is the distal portion of the second limiting mechanism 220 .

The push rod assembly is configured such that when the distal end of the deformation portion passes through the first through hole 213 together with the distal end of the control rod 300 and is located in the first limiting area 211 , and the When the axial distance from the second connection point to the first connection point is less than a predetermined value, the distal portion of the deformation portion expands radially until the maximum radial dimension of this portion is greater than that of the first through hole 213 Aperture, the distal portion of the deformation part is restricted in the first limiting area 211, so that the push rod assembly is in the locking position. When the control rod 300 moves from the proximal end to the distal end until the axial distance from the second connection point to the first connection point is equal to the predetermined value, the distal portion of the deformation portion radially shrinks to The maximum radial dimension of this part is less than or equal to the diameter of the first through hole 213, so as to allow the distal part of the deformation part to pass through the first through hole 213 in the direction from the distal end to the proximal end and to be disengaged. The first limiting area 211, at this time, the push rod assembly is in the unlocked position. It can be understood that the radial size of the deformation portion refers to the size of the deformation portion on the radial section of the first sub-limiting mechanism 210 . And, the meanings of radial expansion and radial contraction are relative, the radial dimension of the distal part of the deformation part changes from small to large, that is, radial expansion, and the radial dimension of this part changes from large to small That is radial shrinkage.

In some implementation manners, the deformation part includes an elastic sleeve, and the elastic sleeve is disposed on the outside of the control rod 300 . Alternatively, the deformation portion includes a plurality of elastic pieces arranged around the control rod 300 , in this case, the predetermined value is equal to the length of the deformation portion in a natural state, and the natural state refers to the When the deformation part is not subjected to external force, the radial dimension of the distal part of the deformation part in the natural state is smaller than or equal to the diameter of the first through hole 213, so that this part of the deformation part can pass through The first through hole 213 . When the axial distance between the second connection point and the first connection point is smaller than the predetermined value, the distal end portion of the deformation portion is bent and deformed and radially expanded, and when the second connection point and the first connection point are When the axial distance between the first connection points is equal to the predetermined value, the distal end portion of the deformation part returns to a natural state. In some other implementation manners, the deformation part is a self-expanding structure, for example, the deformation part may include a plurality of rods that are pre-shaped into an arc, and the plurality of rods are arranged around the control rod 300, and the rods The concave side of is facing the control rod 300, where the predetermined value is greater than the axial length of the control rod 300 when the deformation part is in the natural state, when the deformation part is in the natural state , the radial dimension of the distal portion of the deformation portion is larger than the diameter of the first through hole 213, so that when the push rod assembly is in the locked position, the distal end of the rod body of the deformation portion The part is still in an arc shape, so that the entire distal end of the deformation part is in the shape of a lantern, and when the push rod assembly is in the unlocked position, the rod body can be stretched into a straight shape. The self-expanding structure means that the structural member itself has good resilience, and it deforms when it is subjected to an external force, and when the external force is canceled, the structural member can recover under the action of its own resilience. Usually, the self-expanding structure can be made of shape memory alloy.

In addition, in this embodiment, the structure of the first sub-limiting mechanism 210 may be completely the same as that in Embodiment 1, or it may be different. Please continue to refer to FIG. 9 to FIG. 12 , the first sub-limiting mechanism 210 described in the illustration is a hollow structure, which has a third inner cavity, and the third inner cavity constitutes the first limiting area 211 . The second engaging portion 214 of a sub-limiting mechanism 210 may not be provided with a fourth through hole.

Next, the process of pushing the medical implant (ie, the embolic coil 10 ) by the push rod assembly provided in this embodiment will be described.

Afterwards, the embolic coil 10 is introduced into the second lumen of the catheter 1 that has been pre-implanted in the patient's body through a sheath.

The operator then applies a pushing force to the push rod assembly at the proximal end of the push rod 100 and delivers the embolic coil 10 into the body. Continue to apply pushing force to the push rod assembly, when the embolic coil 10 is completely outside the catheter 1, if the embolic coil 10 has been correctly positioned, the operator can press the control rod 300 near the end to apply a pushing force, and make the control rod 300 move from the proximal end to the distal end until the axial distance between the second connection point and the first connection point is equal to the predetermined value, so that the The distal portion of the deformation portion is radially contracted until the radial dimension of this portion is smaller than or equal to the diameter of the first through hole 213 , and at this time the push rod assembly is in the unlocked position. Then keep the control rod 300 and the push rod 100 axially relatively stationary, and apply a retraction force on the proximal ends of the control rod 300 and the push rod 100, so that the control rod 300 and the push rod 100 The rod 100 moves synchronously along the direction from the distal end to the proximal end until the distal end portion of the control rod 300 carries the distal end portion of the deformable portion through the first through hole 213 and is positioned at the first through hole 213. At the proximal side of the blocking portion 212 , the embolic spring coil 10 carries the first sub-limiting mechanism 210 and disengages from the push rod 100 . Before switching the push rod assembly to the unlocked position, if the positioning of the embolic coil 10 is found to be inaccurate during the process of pushing the embolic coil 10, the operator can withdraw the push rod Assembly to recover the embolic coil 10 to the second lumen of the catheter 1 and release it after adjusting the position.

This embodiment also provides a medical device, including a medical implant and the push rod assembly, and the first sub-limiting mechanism 210 of the push rod assembly is connected to the proximal end of the medical implant.

In the technical solution provided by the embodiment of the present invention, through the cooperation between the control rod and the limit mechanism, the push rod assembly can be switched between the locked position and the unlocked position, and the push rod assembly is used to push and When the medical implant is released, as long as the push rod assembly remains at the locking position, the medical implant can be recovered at any time, so as to adjust the position of the medical implant, which is beneficial to improve The positioning accuracy of the medical implant improves the therapeutic effect. Not only that, when the push rod assembly is at the locking position, it can also avoid the situation that the first sub-limiting mechanism and the second sub-limiting mechanism disengage early when passing through the bending area of the blood vessel, thereby improving reliability.

Although the present invention is disclosed above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

A push rod assembly is characterized in that it comprises:

The push rod has a first inner cavity axially penetrated;

The limiting mechanism includes a first sub-limiting mechanism and a second sub-limiting mechanism; the first sub-limiting mechanism is formed with a first limiting area, and also includes a first stop, the first stop It is arranged at the proximal end of the first limiting area, and the first stop part is provided with a first through hole communicating with the first limiting area; the second sub-limiting mechanism is connected to the the distal end of the push rod; and,

Controller;

The push rod assembly is configured such that when the distal end of the control rod passes through the first inner cavity and the first through hole, and is connected with the distal end portion of the second sub-limiting mechanism, and will When the distal part of the second sub-limiting mechanism is limited in the first limiting area, the push rod assembly is in the locked position; when the control rod moves along the axial direction of the first through hole, And when the distal part of the second sub-limiting mechanism is allowed to break away from the first limiting area, the push rod assembly is in the unlocked position.
The push rod assembly according to claim 1, wherein the first limiting area is formed on the side of the first sub-limiting mechanism, and is radially inwardly recessed; the second sub-limiting area The side of the positioning mechanism is formed with a second limiting area radially inwardly recessed, and also includes a second blocking portion, which is arranged at the distal end of the second limiting area and constitutes the The distal part of the second sub-limiting mechanism, the second stopper is provided with a second through hole, and the second through hole, the second limiting area and the first inner cavity are sequentially connected;

When the push rod assembly is in the locked position, the control rod also constrains the first stop part in the second limiting area, and the distal end of the control rod also passes through the first Two through holes; when the control rod moves in the direction from the distal end to the proximal end and the distal end of the control rod is located on the proximal side of the second limiting area, the push rod assembly is in the The unlocked position also allows the first blocking part to disengage from the second limiting area.
The push rod assembly according to claim 2, wherein the second sub-limiting mechanism further comprises a first engaging portion, the first engaging portion is located at the proximal end of the second limiting area, and is in contact with The distal end of the push rod is connected; the first joint part is provided with a third through hole, the third through hole communicates with the first inner cavity and the second limiting area, and is used for the The distal end of the control rod penetrates.
The push rod assembly according to claim 2, wherein the push rod assembly is used to movably pass through the second lumen of a catheter to deliver a medical implant to a target position.
The push rod assembly according to claim 4, characterized in that, the ratio of the sum of the width of the first blocking portion and the width of the second blocking portion to the diameter of the second inner cavity ranges from 1 to 1.5 .
The push rod assembly according to claim 1, wherein the second sub-limiting mechanism includes a deformation portion, the deformation portion is arranged around the control rod, and the proximal end of the deformation portion is connected to the At the first connection point on the push rod, the distal end of the deformation part is connected to the second connection point on the control rod; the distal part of the deformation part is the part of the second sub-limiting mechanism. remote part;

The push rod assembly is configured when the distal portion of the deformation part passes through the first through hole and is located in the first limiting area, and when the second connection point is connected to the first connection point When the axial distance is less than a predetermined value, the distal end portion of the deformation portion is radially expanded to a radially largest dimension larger than the diameter of the first through hole, so that the distal end portion of the deformation portion is restricted within the first through hole. In the limit area, when the control rod moves in the direction from the proximal end to the distal end, and the axial distance from the second connection point to the first connection point is equal to the predetermined value, the deformation The distal portion of the deformation portion is radially shrunk to a radial dimension smaller than or equal to the diameter of the first through hole, so as to allow the distal portion of the deformation portion to break away from the first limiting area.
The push rod assembly according to claim 6, wherein the deformation part includes a plurality of elastic pieces, and the plurality of elastic pieces are sequentially arranged around the control rod; or, the deformation part is an elastic sleeve, and is sleeved on the outside of the control rod.
The push rod assembly according to claim 6, wherein the first sub-limiting mechanism has a third inner cavity, and the third inner cavity constitutes the first limiting area.
The push rod assembly according to claim 1, wherein the push rod is braided from wire.
The push rod assembly according to claim 1, wherein the diameter of the control rod is 50%-60% of the diameter of the first through hole.
The push rod assembly according to claim 1, wherein the first sub-limiting mechanism further includes a second engaging portion disposed at a distal end of the first limiting area.
A medical device, characterized in that it comprises a medical implant and the push rod assembly according to any one of claims 1-11, the first sub-limiting mechanism is used to connect to the medical implant the proximal end.
The medical device of claim 12, wherein the medical implant comprises an embolic coil.