CN215688186U

CN215688186U - Implant instrument delivery system and connection structure thereof

Info

Publication number: CN215688186U
Application number: CN202120896372.2U
Authority: CN
Inventors: 王伦; 刘天宇; 李庆楠; 姚瑶; 李俊菲
Original assignee: Shanghai Zuoxin Medical Technology Co ltd
Current assignee: Shanghai Zuoxin Medical Technology Co ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2022-02-01
Anticipated expiration: 2031-04-28

Abstract

The utility model relates to an implant instrument conveying system and a connecting structure thereof, wherein the connecting structure comprises a first connecting piece and a second connecting piece which are in threaded fit with each other, the first connecting piece and the second connecting piece are respectively connected with a pushing rod and an implant instrument, the connecting structure also comprises a guide structure, the guide structure comprises at least one cylindrical surface, and the guide structure enables an external thread structure and a threaded hole to be coaxial with the central line of the cylindrical surface when being matched. According to the implantation instrument conveying system and the connection structure thereof, the guide structure is used for maintaining the coaxial matching of the external thread structure and the threaded hole, the external thread structure is prevented from deviating from the axis of the threaded hole, the external thread structure is enabled to be more easily disengaged from the threaded hole, and therefore in the process of disengaging the implantation instrument by using the implantation instrument conveying system with the connection structure, compared with the case that the guide structure is not arranged on the connection structure, the disengagement operation is more convenient and faster, and the reliability is higher.

Description

Implant instrument delivery system and connection structure thereof

Technical Field

The utility model relates to the technical field of interventional medical treatment, in particular to an implantable instrument conveying system and a connecting structure thereof.

Background

Atrial fibrillation is the most common persistent arrhythmia and is at risk of inducing ischemic stroke, and therefore prevention of atrial fibrillation is of great importance. Recent studies have shown that plugging the left atrial appendage is effective in preventing the risk of ischemic stroke due to atrial fibrillation.

The existing occluders for left atrial appendage occlusion can be basically divided into two categories, one is a plug type occluder represented by Watchman. The other type is a cap type stopper represented by lamb.

The plugging device is connected with and disconnected from a pushing rod of a conveying system by a threaded structure. However, in the releasing operation process, it is difficult to ensure that the pushing rod and the occluder are maintained in the same straight line, specifically, when the delivery system delivers the occluder to a proper position, the pushing rod is generally in a bent state in vivo, when the releasing operation is performed, the pushing rod easily deflects the male thread to one side relative to the female thread, so that the thread matching position of the male thread and the female thread has a large stress in the direction deviating from the axial direction, when the releasing operation is performed, the releasing operation can be completed by operating a larger torsion of the pushing rod relative to the occluder, even the situation that the male thread and the female thread cannot be released due to an overlarge stress deviating from the axial direction between the male thread and the female thread occurs, which easily further causes the pushing rod to generate improper traction on the occluder, and seriously affects the reliability of the releasing operation.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an implantable device delivery system and a connection structure thereof that effectively improves the reliability of the detachment operation.

In one aspect, the utility model provides a connecting structure of an implanting instrument conveying system, wherein the implanting instrument conveying system is used for conveying an implanting instrument, the implanting instrument conveying system comprises a push rod, the connecting structure is used for detachably connecting the push rod with the implanting instrument, the connecting structure comprises a first connecting piece, a second connecting piece and a guide structure, the first connecting piece is provided with a threaded hole, the second connecting piece is provided with an external thread structure matched with the threaded hole, one of the first connecting piece and the second connecting piece is connected with the push rod, and the other one of the first connecting piece and the second connecting piece is connected with the implanting instrument; the guide structure comprises at least one cylindrical surface, when the first connecting piece is matched with the second connecting piece, the external thread structure and the threaded hole are coaxial with the center line of the cylindrical surface, and when the first connecting piece and the second connecting piece rotate relatively around the center line of the cylindrical surface, the external thread structure and the threaded hole are screwed and moved along the center line of the at least one cylindrical surface under the guidance of the guide structure.

In one embodiment, the guiding structure includes a straight hole, the straight hole is communicated with the threaded hole, the at least one cylindrical surface includes an inner wall surface of the straight hole, the diameter of the straight hole is larger than the small diameter of the threaded hole and smaller than the large diameter of the threaded hole, the straight hole is coaxially arranged with the threaded hole, and the diameter of the straight hole is equal to the large diameter of the external thread structure, so that the external thread structure can be coaxially matched with the threaded hole under the guidance of the straight hole.

In one embodiment, the arithmetic mean Ra of the profiles of the inner wall surfaces of the straight holes is less than or equal to 3 μm.

In one embodiment, the length of the straight hole along the direction of the center line of the straight hole is 0.8 to 3 times of the pitch of the threaded hole.

In one embodiment, the guiding structure includes a positioning column connected to the second connecting member, the at least one cylindrical surface includes an outer circumferential surface of the positioning column, the outer circumferential surface of the positioning column is coaxially adjacent to the external threaded structure, the diameter of the positioning column is equal to the minor diameter of the threaded hole, and when the external threaded structure is matched with the threaded hole, the outer circumferential surface of the positioning column abuts against the minor diameter of the threaded hole to coaxially position the external threaded structure in the threaded hole.

In one embodiment, the arithmetic mean Ra of the profiles of the outer peripheral surfaces of the positioning columns is less than or equal to 3 μm.

In one embodiment, the guiding structure includes a guiding hole and a guiding post, which are capable of sliding fit with each other, the guiding post is disposed on the first connecting member, the guiding hole is disposed on the second connecting member, and the at least one cylindrical surface includes a first cylindrical surface and a second cylindrical surface, wherein a peripheral side wall of the guiding post forms the first cylindrical surface, the first cylindrical surface is coaxial with the threaded hole, a hole wall of the guiding hole forms the second cylindrical surface, the second cylindrical surface is coaxial with the external thread structure, and when the guiding post is matched with the guiding hole, the second cylindrical surface is coaxially sleeved on an outer side of the first cylindrical surface, so that the external thread structure is coaxial with the threaded hole.

In one embodiment, the threaded hole is located in a space enclosed by the first cylindrical surface, the second cylindrical surface extends along a center line direction of the second cylindrical surface to form a connecting end and an open end which are opposite to each other, the external thread structure is located in the guide hole, a first end of the external thread structure is connected with the connecting end, a second end of the external thread structure extends towards the open end along the center line of the guide hole, the second end is located on one side, facing the connecting end, of a plane where the open end is located, and the threaded hole is located in the space enclosed by the first cylindrical surface.

In one embodiment, the distance between the second end and the plane of the open end is 0.2mm to 5mm, and/or the distance between the second end and the plane of the open end is 0.8 times to 3 times the pitch of the external thread structure.

In one embodiment, the guide post is integrally formed with the first connector.

In one embodiment, the guide post is located in the threaded hole, the external thread structure is a stud, and the guide hole penetrates through the end face of the stud along the center line of the stud.

In one embodiment, the method comprises at least one of the following technical schemes:

the length of the guide hole along the direction of the center line of the guide hole is 0.2mm to 5mm greater than that of the external thread structure;

or the length of the guide hole along the direction of the center line of the guide hole is 0.5 to 5 times of the length of the guide column along the center line of the guide column;

or the length of the guide post extending out of the threaded hole is 0.2mm to 5 mm.

In one embodiment, the arithmetic mean Ra of the profiles of said first cylindrical surface and/or said second cylindrical surface is less than or equal to 3 μm.

In another aspect, the present invention provides an implant instrument delivery system, comprising a push rod and a connection structure as described above, wherein the push rod is detachably connected to the implant instrument through the connection structure.

The implantation instrument conveying system and the connection structure thereof comprise a first connection piece and a second connection piece which are in threaded fit with each other, wherein the first connection piece and the second connection piece are respectively connected with the push rod and the implantation instrument so as to be separately connected between the push rod and the implantation instrument, and simultaneously, the connection structure also comprises a guide structure, the guide structure comprises at least one cylindrical surface, and when the external thread structure is matched with the threaded hole, the guide structure is coaxial with the central line of the cylindrical surface, thereby avoiding the deviation of the external thread structure from the axis of the threaded hole, reducing the stress of the external thread structure and the threaded hole in the direction deviating from the axial direction, enabling the external thread structure to be more easily disengaged from the threaded hole, so that when the implantation instrument conveying system utilizing the connection structure is used for disengaging the implantation instrument, compared with the case that the connection structure is not provided with the guide structure, more convenient and more reliable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings of the embodiments can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating a portion of one embodiment of an implantable device delivery system;

FIG. 2 is a schematic structural view of a coupling structure of an implantable device delivery system according to one embodiment;

FIG. 3 is a schematic view of the delivery system of FIG. 1 showing the pusher rod disengaged from the insertion instrument;

FIG. 4 is a schematic view of the connection of a first connecting member and a second connecting member in the embodiment of the connection structure shown in FIG. 3;

FIG. 5 is a schematic structural view of another embodiment of a connecting structure;

FIG. 6 is a schematic structural view of a connection structure according to still another embodiment;

FIG. 7 is a schematic structural view of a connecting structure according to still another embodiment;

FIG. 8 is a schematic view of a coupling configuration of a first coupling member and a second coupling member of another embodiment of an implantable device delivery system.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that "distal" and "proximal" are used as terms of orientation that are commonly used in the field of interventional medical devices, wherein "distal" refers to the end that is distal from the operator during the procedure, and "proximal" refers to the end that is proximal to the operator during the procedure. Axial, meaning a direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device; radial, means a direction perpendicular to the above-mentioned axial direction.

An implant instrument delivery system is provided for delivering an implant instrument to a location to be implanted. Taking the implantation instrument as an example of the left atrial appendage occluder, when the left atrial appendage occlusion operation is performed, the left atrial appendage occluder can be implanted into the left atrial appendage by utilizing the implantation instrument conveying system so as to prevent the left atrial appendage from forming thrombus. In other embodiments, the implantation device may also be a vascular stent or a heart valve, etc., which is not limited herein.

Referring to fig. 1 and 3, the implant device delivery system includes a push rod 10 and a connecting structure 20. Wherein, the connecting structure 20 serves as a detachable connection between the implantation instrument 30 and the push rod 10, that is, the push rod 10 is detachably connected with the implantation instrument 30 through the connecting structure 20. As shown in FIG. 1, when delivering the implanting device 30, the connecting structure 20 is used to connect the implanting device 30 with the pushing rod 10 so as to move the implanting device 30 by using the pushing rod 10. As shown in FIG. 3, when it is desired to release the connection between the pushing rod 10 and the implanting device 30, the connecting structure 20 can accommodate the release operation of the pushing rod 10 and the implanting device 30, i.e., the separation between the pushing rod 10 and the implanting device 30 is achieved, and the implanting device delivery system can be withdrawn.

As shown in fig. 2, the connecting structure 20 includes a first connecting member 21, a second connecting member 22, and a guide structure.

The first connector 21 has a threaded bore 211 and the second connector 22 has an external thread formation 221 which mates with the threaded bore 211. That is, the first connecting member 21 and the second connecting member 22 are detachably connected to each other by means of screw-coupling.

The first connecting piece 21 is connected with one of the pushing rod 10 and the implanting instrument 30, and the second connecting piece 22 is connected with the other of the pushing rod 10 and the implanting instrument 30, so that the detachable connection between the pushing rod 10 and the implanting instrument 30 is realized through the threaded matching of the first connecting piece 21 and the second connecting piece 22, and the delivery and release requirements of the implanting instrument delivery system on the implanting instrument 30 are met.

When the first connecting piece 21 is matched with the second connecting piece 22, the guide structure is used for limiting the relative positions of the second connecting piece 22 and the first connecting piece 21 along the radial direction of the second connecting piece 22, and the external thread structure 221 and the threaded hole 211 are kept coaxial with the center line of the cylindrical surface, so that the external thread structure 221 and the threaded hole 211 are coaxial with each other, the stress of the external thread structure 221 and the threaded hole 211 in the direction deviating from the axial direction is effectively reduced, and the external thread structure 221 is more easily disengaged from the threaded hole 211. Meanwhile, the external thread structure 221 and the threaded hole 211 are coaxially matched with each other, which means that the coaxiality between the push rod 10 and the implantation instrument 30 is better when the push rod and the implantation instrument 30 are connected through the connection structure 20, so that the installation of the implantation instrument 30 to the position to be implanted is facilitated, the situation that the push rod 10 and the implantation instrument 30 are not coaxial when connected and the operation accuracy when the implantation instrument 30 is released is influenced, and the releasing process is complicated or the releasing position is inaccurate is avoided.

It should be noted that when the first connection member 21 and the second connection member 22 rotate relatively around the center line of the cylindrical surface, the external thread structure 221 and the threaded hole 211 move in a threaded manner along the center line of at least one cylindrical surface under the guidance of the guiding structure, that is, the cylindrical surface in the guiding structure does not limit the circumferential and axial movement between the external thread structure 221 and the threaded hole 211, so that the external thread structure 221 and the threaded hole 211 can be in normal threaded fit.

Due to the connecting structure 20, the external thread structure 221 and the threaded hole 211 are kept coaxial under the guidance of the guiding structure, so that the external thread structure 221 can be screwed out of the threaded hole 211 more easily, and therefore, when the implantation instrument conveying system comprising the connecting structure 20 is adopted to perform the releasing operation on the implantation instrument 30, the releasing operation is more convenient and more reliable. Specifically, under the guidance of the guiding structure, the external thread structure 221 and the threaded hole 211 are maintained to be coaxial, so that even if the pushing rod 10 bends in the body to cause the external thread structure 221 to have a tendency of deviating relative to the threaded hole 211, the guiding structure can ensure that the external thread structure 221 and the threaded hole 211 are coaxially matched, the situation that the external thread structure 221 deviates from the axis of the threaded hole 211 to cause the screw motion of the external thread structure and the threaded hole 211 to be blocked is avoided, and the releasing reliability between the implantation instrument conveying system and the implantation instrument 30 is effectively improved.

It should be noted that the guiding structure may be a part of the first connecting member 21 or the second connecting member 22, or may be a separate structure connected to the first connecting member 21 or the second connecting member 22, which is not limited herein.

For the purpose of description, the present invention provides some embodiments in which the guiding structure is only described as a portion of the connecting structure 20 that realizes the guiding between the first connecting member 21 and the second connecting member 22, and some embodiments adaptively adopt a dotted line to form the divided guiding structure, and actually, the guiding structure may be integrally formed with the corresponding first connecting member 21 or the second connecting member 22, that is, the structural feature that realizes the function of the guiding structure is a portion of the first connecting member 21 or the second connecting member 22.

For example, referring to FIG. 2, the guide structure includes a straight bore 23, and the straight bore 23 may be the internal bore of a collar or sleeve, such that the straight bore 23 remains coaxial with the threaded bore 211 by virtue of the collar or sleeve being coupled to the first connector 21. Alternatively, the straight hole 23 is formed on the first connecting member 21, and in this case, the guide structure facilitates the first connecting member 21 to be integrally formed.

In this embodiment, at least one of the cylindrical surfaces included in the guide structure includes the inner wall surface 23a of the straight hole 23, that is, the inner wall surface 23a of the straight hole 23 is a cylindrical surface.

The straight hole 23 communicates with the threaded hole 211, and the diameter of the straight hole 23 is larger than the small diameter of the threaded hole 211 and smaller than the large diameter of the threaded hole 211.

In this embodiment, the straight hole 23 is coaxially disposed with the threaded hole 211, and has a diameter equal to the major diameter of the male thread structure 221, so that the male thread structure 221 can be coaxially fitted with the threaded hole 211 under the guidance of the straight hole 23. Through the structure, the external thread structure 221 is guided by the straight hole 23, and the inner wall of the straight hole 23 realizes radial positioning on the large diameter of the external thread structure 221, so that the external thread structure 221 is effectively prevented from deviating from the central line of the straight hole 23, because the inner wall surface 23a of the straight hole 23 is a cylindrical surface, at the moment, the central line of the external thread structure 221 is coaxial with the central line of the cylindrical surface, and then the external thread structure 221 is coaxial with the central line of the cylindrical surface when matched with the threaded hole 211, so that the external thread structure 221 can easily perform spiral motion relative to the threaded hole 211, the probability of thread jamming is reduced, and the reliability of the connecting structure 20 is improved.

The arithmetic mean Ra of the contours of the inner wall surface 23a of the straight hole 23 is less than or equal to 3 μm, so that the inner wall surface 23a of the straight hole 23 is relatively smooth, and when the straight hole 23 is adopted to position and guide the male thread structure 221, the friction force between the inner wall surface 23a of the straight hole 23 and the male thread structure 221 is relatively small, so that the screw motion between the male thread structure 221 and the screw hole 211 is smooth.

The length of the straight hole 23 along the central line direction of the straight hole is 0.8 times to 3 times of the pitch of the threaded hole 211, so that the length of the straight hole 23 is long enough to obtain a stable guiding effect, and meanwhile, the overlong straight hole 23 is avoided to cause the overlong size of the connecting structure 20, so that the flexibility and the safety of the operation and control of the implantation instrument 30 by the implantation instrument conveying system are ensured.

Referring to fig. 3 and 4, in some embodiments, the guiding structure includes a positioning pillar 24 connected to the second connecting member 22, and the positioning pillar 24 may be integrally connected to the second connecting member 22 by welding or gluing, or may be directly formed integrally with the second connecting member 22. In this embodiment, the aforementioned at least one cylindrical surface of the guiding structure includes an outer circumferential surface 24a of the positioning pillar 24, that is, the outer circumferential surface 24a of the positioning pillar 24 is a cylindrical surface.

Outer peripheral surface 24a of positioning column 24 is coaxially adjacent to external thread structure 221, and the diameter of positioning column 24 is equal to the small diameter of threaded hole 211. When the external thread structure 221 is matched with the threaded hole 211, the outer peripheral surface 24a of the positioning column 24 abuts against the small diameter of the threaded hole 211, so that the external thread structure 221 is coaxially positioned in the threaded hole 211. The positioning in the radial direction between the positioning column 24 and the threaded hole 211 enables the external thread structure 221 to be coaxial with the threaded hole 211, so that the screw movement between the external thread structure 221 and the threaded hole 211 is facilitated, and the reliability of the connecting structure 20 is improved.

In some embodiments, the male thread structure 221 and the threaded hole 211 are in threaded connection in a delivery fit manner, that is, the diameter of the major diameter of the male thread structure 221 is larger than the diameter of the minor diameter of the threaded hole 211 and smaller than the diameter of the major diameter of the threaded hole 211, and the diameter of the minor diameter of the threaded hole 211 is larger than the diameter of the minor diameter of the male thread structure 221 and smaller than the diameter of the major diameter of the male thread structure 221, so that after the threaded hole 211 is in threaded fit, a gap exists between the major diameters of the two, and a gap exists between the minor diameters of the two. In this embodiment, because the guiding structure is adopted to have the effect of coaxial positioning for external thread structure 221 and threaded hole 211, thereby the loose fit of external thread structure 221 and threaded hole 211 makes the contact surface between the two smaller, to be exact, the guiding structure suspends external thread structure 221 in a coaxial manner relative to threaded hole 211, although external thread structure 221 still keeps in contact with the thread fit position of threaded hole 211, but external thread structure 221 and threaded hole 211 are almost negligible in the stress of deviating from the axial direction, so more be favorable to the spiral movement between external thread structure 221 and threaded hole 211, under the condition of ensuring the reliability of connecting structure 20, promote the convenience of releasing operation.

The arithmetic mean Ra of the contours of outer peripheral surface 24a of positioning post 24 is less than or equal to 3 μm, so that the friction between positioning post 24 and the small diameter of screw hole 211 is small, and smooth screwing movement between male screw structure 221 and screw hole 211 is possible.

In the embodiment provided by the utility model, the structure of the cylindrical surface part formed by the guide structure may be solid or hollow. Specifically, the cylindrical surface is used as the surface of a structure for realizing positioning and guiding by the guiding structure, and the guiding function of the structure enclosed by the cylindrical surface is independent of whether the part of the structure is solid or hollow. For example, as shown in fig. 4, positioning column 24 enclosed by the cylindrical surface is a solid cylinder, and the positioning column 24 and the threaded hole 211 are engaged to achieve the positioning and guiding effect. In other embodiments, as shown in fig. 5, the positioning column 24 enclosed by the cylindrical surface is a hollow cylinder having a cavity 24b, and at this time, the cylindrical surface of the positioning column 24 is abutted against the small diameter of the threaded hole 211, so that a good positioning and guiding effect can still be achieved.

In the embodiment provided by the utility model, the structural form of the guide structure is not limited to one cylindrical surface, and may be 2 or more than 2 cylindrical surfaces. Accordingly, in each embodiment, the guiding structural members may be a part of the guiding structure as long as there is no conflict between the guiding structural members. That is, the external thread structure 221 and the threaded hole 211 can be coaxially matched by one or more realizable modes of the guiding structures provided by the various embodiments, so as to improve the reliability of the connecting structure 20. For example, as shown in connection with fig. 6, the guide structure includes the aforementioned straight hole 23 and positioning post 24. Therefore, the straight hole 23 and the positioning column 24 can play a role in dual positioning and guiding, so that the reliability of the coaxial matching between the external thread structure 221 and the threaded hole 211 is better, and the reliability and the stability of the releasing operation of the connecting structure 20 are facilitated. For the structural arrangement of the straight hole 23 and the positioning pillar 24, reference may be made to the related embodiments, which are not described herein again.

In other embodiments, the guiding structure may also be a cylinder or a sleeve, and the surface of the cylinder or the sleeve defines a cylindrical surface, as long as the element forming the guiding structure can form the cylindrical surface for positioning and guiding, and whether regular or irregular holes or grooves are formed in the structure enclosed by the cylindrical surface is not limited herein.

As shown in connection with fig. 7 and 8, in some embodiments, the guide structure includes a guide hole 25 and a guide post 26 that can be slidably fit into each other. The guide post 26 is provided to the first link 21, and the guide hole 25 is provided to the second link 22. In this embodiment, the guiding structure includes at least one cylindrical surface, including a first cylindrical surface 26a and a second cylindrical surface 25a respectively formed on the guiding column 26 and the guiding hole 25, specifically, the peripheral side wall of the guiding column 26 forms the first cylindrical surface 26a, the first cylindrical surface 26a is coaxial with the threaded hole 211, the hole wall of the guiding hole 25 forms the second cylindrical surface 25a, the second cylindrical surface 25a is coaxial with the external thread structure 221, when the guiding column 26 is matched with the guiding hole 25, the second cylindrical surface 25a is coaxially sleeved on the outer side of the first cylindrical surface 26a, then the second cylindrical surface 25a and the first cylindrical surface 26a are radially limited to each other and keep coaxial, because the first cylindrical surface 26a is coaxial with the threaded hole 211, the second cylindrical surface 25a is coaxial with the external thread structure 221, therefore, this arrangement makes the external thread structure 221 and the threaded hole 211 keep coaxial, thereby allowing the connection structure 20 to have good releasing performance.

There are many possibilities for the arrangement of the guide posts 26 and the guide holes 25 relative to the first connecting part 21 and the second connecting part 22.

In some embodiments, as shown in fig. 7, the threaded hole 211 is located in the space enclosed by the first cylindrical surface 26a, the external thread structure 221 is located in the guiding hole 25, the second cylindrical surface 25a extends along its own centerline direction to form the opposite connecting end 251 and the open end 252, and accordingly, the external thread structure 221 has two opposite ends in its own centerline direction, that is, the thread starting position of the external thread structure 221 is one end, and the thread ending position is the other end, and for convenience of description, the two ends of the external thread structure 221 are respectively referred to as "first end 221 a" and "second end 221 b". In this embodiment, the first end 221a of the male thread structure 221 is connected to the connecting end 251, the second end 221b extends toward the open end 252 along the center line of the guide hole 25, and the second end 221b is located on the side of the plane of the open end 252 toward the connecting end 251, that is, the second end 221b of the male thread structure 221 does not extend out of the guide hole 25. Because the screw hole 211 is located in the space enclosed by the first cylindrical surface 26a, the whole process of the external thread structure 221 and the screw hole 221 in a disengaged mode is realized, the first cylindrical surface 26a and the second cylindrical surface 25 are coaxially sleeved, a good positioning and guiding effect can be achieved, the coaxiality of the external thread structure 221 and the screw hole 221 is ensured, and the disengaging operation is more reliable.

In some embodiments, the distance between the second end 221b and the plane of the open end 252 is 0.2mm to 5mm, and/or the distance between the second end 221b and the plane of the open end 252 is 0.8 times to 3 times the pitch of the external thread structure 221, so as to ensure that the external thread structure 221 is coaxial with the guide post 26 and the guide hole 25 in sliding fit when the external thread structure 221 is disengaged from the threaded hole 211, so as to maintain the stability of the disengaging operation.

In some embodiments, the guide posts 26 are integrally formed with the first connector 21.

As shown in fig. 8, in some embodiments, the guide post 26 is located within the threaded bore 211, the externally threaded structure 221 is a stud, and the guide hole 25 extends through an end surface of the stud along a centerline of the stud, such that engagement of the guide post 26 with the guide hole 25 also coaxially engages the externally threaded structure 221 with the threaded bore 211.

It should be noted that, referring to fig. 7 and 8, in another embodiment, two sets of guiding studs 26 and guiding holes 25 may be provided, wherein the arrangement of one set of guiding studs 26 and guiding holes 25 is shown in fig. 7, and the arrangement of the other set of guiding studs 26 and guiding holes 25 is shown in fig. 8, so that the reliability and stability of the releasing operation of the connecting structure 20 can be further improved by using the cooperation of the two guiding studs 26 and the corresponding guiding holes 25.

In some embodiments, the length of the guide hole 25 in the direction of its own center line is 0.2mm to 5mm greater than the length of the male screw structure 221, thereby obtaining a good positioning and guiding effect.

The protruding length of the guide post 26 from the threaded hole 211 is 0.2mm to 5mm, so that the guide post 26 and the guide hole 25 can keep good coaxial positioning and guiding effects before the external thread structure 221 is completely disconnected from the threaded hole 211.

With the arrangement that the length of the guide hole 25 along the center line direction of the guide hole is 0.5 times to 5 times that of the guide post 26 along the center line of the guide hole, the guide post 26 is matched with the guide hole 25, so that the coaxial matching of the external thread structure 221 and the threaded hole 211 can be realized, and the phenomenon that the connecting structure 20 is unfavorable for miniaturization due to the fact that the axial size is too large is avoided.

The arithmetic mean Ra of the contour of the first cylindrical surface 26a and/or the second cylindrical surface 25a is less than or equal to 3 μm, so that when the guide post 26 is matched with the guide hole 25 to position and guide the external thread structure 221 and the threaded hole 211, the friction force between the external thread structure 221 and the threaded hole 211 is small, and the external thread structure 221 and the threaded hole 211 can be more smoothly disconnected, so that the disconnection operation between the push rod 10 and the implantation instrument 30 is facilitated.

In the connection structure 20 provided by the present invention, the specifications of the male thread structure 221 and the female thread are not limited, and the pitch of the thread and the number of turns of the thread may be configured according to the actual connection requirement. For example, in some embodiments, the pitch of the external thread formation 221 and/or the internal thread is 0.2-2mm, with 2 to 10 turns of thread.

The thread material forming the external thread structure 221 or the threaded hole 211 is stainless steel, nickel titanium, magnesium alloy, titanium alloy, or the like.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The connecting structure of the implanting instrument conveying system is used for conveying an implanting instrument, the implanting instrument conveying system comprises a push rod, and the connecting structure is used for detachably connecting the push rod with the implanting instrument, and is characterized in that the connecting structure comprises a first connecting piece, a second connecting piece and a guide structure, the first connecting piece is provided with a threaded hole, the second connecting piece is provided with an external thread structure matched with the threaded hole, one of the first connecting piece and the second connecting piece is connected with the push rod, and the other one of the first connecting piece and the second connecting piece is connected with the implanting instrument; the guide structure comprises at least one cylindrical surface, when the first connecting piece is matched with the second connecting piece, the external thread structure and the threaded hole are coaxial with the center line of the cylindrical surface, and when the first connecting piece and the second connecting piece rotate relatively around the center line of the cylindrical surface, the external thread structure and the threaded hole are screwed and moved along the center line of the at least one cylindrical surface under the guidance of the guide structure.

2. The connecting structure according to claim 1, wherein the guide structure includes a straight hole, the straight hole communicates with the threaded hole, the at least one cylindrical surface includes an inner wall surface of the straight hole, a diameter of the straight hole is larger than a small diameter of the threaded hole and smaller than a large diameter of the threaded hole, the straight hole is coaxially disposed with the threaded hole and has a diameter equal to a large diameter of the male screw structure, so that the male screw structure can be coaxially fitted with the threaded hole under guidance of the straight hole.

3. The connection structure according to claim 2, wherein an arithmetic mean Ra of profiles of inner wall surfaces of the straight holes is less than or equal to 3 μm.

4. The connecting structure according to claim 2 or 3, wherein the length of the straight hole in the direction of its own center line is 0.8 to 3 times the pitch of the threaded hole.

5. The connecting structure according to claim 1 or 2, wherein the guiding structure includes a positioning post connected to the second connecting member, the at least one cylindrical surface includes an outer peripheral surface of the positioning post, the outer peripheral surface of the positioning post is coaxially adjacent to the external threaded structure, the diameter of the positioning post is equal to the small diameter of the threaded hole, and when the external threaded structure is matched with the threaded hole, the outer peripheral surface of the positioning post abuts against the small diameter of the threaded hole to coaxially position the external threaded structure in the threaded hole.

6. The connecting structure according to claim 5, wherein an arithmetic mean Ra of contours of outer peripheral surfaces of the positioning posts is less than or equal to 3 μm.

7. The connection structure according to claim 1, wherein the guide structure comprises a guide hole and a guide post capable of being slidably fitted to each other, the guide post is disposed on the first connection member, the guide hole is disposed on the second connection member, and the at least one cylindrical surface comprises a first cylindrical surface and a second cylindrical surface, wherein an outer peripheral wall of the guide post forms the first cylindrical surface, the first cylindrical surface is coaxial with the threaded hole, a hole wall of the guide hole forms the second cylindrical surface, the second cylindrical surface is coaxial with the external thread structure, and when the guide post is fitted to the guide hole, the second cylindrical surface is coaxially sleeved on an outer side of the first cylindrical surface, so that the external thread structure is coaxial with the threaded hole.

8. The connection structure according to claim 7, wherein the threaded hole is located in a space enclosed by the first cylindrical surface, the second cylindrical surface extends along a center line direction of the second cylindrical surface to form an opposite connection end and an opposite opening end, the external thread structure is located in the guide hole, a first end of the external thread structure is connected with the connection end, a second end of the external thread structure extends along the center line of the guide hole towards the opening end, the second end is located on a side, facing the connection end, of a plane where the opening end is located, and the threaded hole is located in a space enclosed by the first cylindrical surface.

9. The connection according to claim 8, wherein the distance between the second end and the plane of the open end is 0.2mm to 5mm, and/or the distance between the second end and the plane of the open end is 0.8 times to 3 times the pitch of the male thread structure.

10. The connection structure according to claim 8, wherein the guide post is integrally formed with the first connection member.

11. The connection according to claim 7, wherein the guide post is located within the threaded bore, the externally threaded structure is a stud, and the guide bore extends through an end face of the stud along a centerline of the stud.

12. The connection structure according to claim 11, characterized by comprising at least one of the following solutions:

13. A connection according to any of claims 7-12, characterized in that the arithmetic mean Ra of the profiles of the first cylindrical surface and/or the second cylindrical surface is less than or equal to 3 μm.

14. An implant instrument delivery system, comprising a push rod and a coupling structure according to any of claims 1-13, the push rod being detachably connectable to an implant instrument via the coupling structure.