CN108618874B

CN108618874B - Implant tool for orthopaedic prosthesis fixation

Info

Publication number: CN108618874B
Application number: CN201710174928.5A
Authority: CN
Inventors: 孙延东; 胡晓苏
Original assignee: Microport Orthopedics Suzhou Co ltd; Suzhou Microport Orthorecon Co Ltd
Current assignee: Microport Orthopedics Suzhou Co ltd; Suzhou Microport Orthorecon Co Ltd
Priority date: 2017-03-22
Filing date: 2017-03-22
Publication date: 2021-01-01
Anticipated expiration: 2037-03-22
Also published as: CN108618874A

Abstract

The invention provides an implantation tool for fixing an orthopaedic prosthesis, which comprises a push rod and a sleeve, wherein the distal end of the sleeve is provided with a connecting piece, an implant is combined with the connecting piece, and the push rod pushes the implant in the sleeve to be separated from the connecting piece to enter the orthopaedic prosthesis. In particular, the sleeve has a first portion and a second portion that are relatively rotatable, such that the implant may be passed through a mounting location on the acetabular cup prosthesis at an arcuate angle into bone tissue of the human body, both to facilitate implantation and to facilitate fixation of the implant.

Description

Implant tool for orthopaedic prosthesis fixation

Technical Field

The invention relates to the technical field of medical instruments, in particular to an implantation tool for fixing an orthopaedic prosthesis.

Background

In total hip arthroplasty, after the acetabular cup is implanted, the acetabular cup needs to be fixed to the acetabulum to ensure that the acetabular cup does not loosen even if subjected to large impact during movement, which is especially true when bones are not fully grown into the pore structure of the outer surface of the acetabular cup or the friction coefficient of the outer surface of the acetabular cup is too low.

Currently, most acetabular cups are fixed by means of screws which are locked into preformed holes in the acetabular cups. To accurately complete the process, screw holes corresponding to the prepared holes of the acetabular cup are punched on the acetabulum, then the screws are implanted by using a tool, and then the acetabular cup is fixed on the acetabulum. In particular, prior to implanting the screws, the surgeon and his or her assistant need to repeatedly adjust the patient's posture and generally determine the location and orientation of the screw hole drills based on the guide lines on the acetabular cup. For example, in a minimally invasive surgery, due to the limitation of a small incision on the skin, a doctor needs to pass a drill bushing and a screw hole drill through a sleeve, and in the case of possible obstruction of the visual line, the doctor tries to determine the position and the direction of a reserved hole on an acetabular cup through a step on the head of the drill bushing and determine the drilling depth through a depth measuring mark on the tail end of the screw hole drill; after the drilling is finished, taking out the screw hole drill bit and the drill bushing, and then using a holding clamp to hold an acetabular screw to be placed near a screw hole to be implanted; then, a screwdriver passes through the drill bushing to bite and tighten the screw; and finally, taking out the holding forceps, the screwdriver and the drill sleeve to complete the fixing operation of the acetabular cup.

However, the above-mentioned acetabular cup fixing method has the following disadvantages:

first, the process of implanting screws is complicated, relatively long time is required for the operation, and accuracy is too dependent on the experience of the main surgeon and his assistant. Specifically, the patient body position needs to be frequently swung to select a proper implantation angle during the operation, before the screw is implanted, a screw drill needs to drill a hole on the acetabular cup and determine the drilling depth, meanwhile, the screw position needs to be roughly adjusted by a holding clamp, and the screw driver needs to be used for repeatedly rotating the screw to complete the implantation of the screw. In particular, when the position of the acetabular cup is deviated, the positioning and orientation of the screws are more complicated, and the operation of implanting the screws is more difficult due to the small visual space of the operator, especially when micro-invasive surgery is performed.

Secondly, the implantation position and the direction of the screw are mainly influenced by the sight line, the body position of a patient, the distribution of a preformed hole on the acetabular cup and the carved guide line on the acetabular cup, so that an operator cannot accurately find the circle center position of the screw, and further, when the implantation position of the screw is inaccurate, the screw is loosened or even falls off, and the whole operation effect is influenced.

Disclosure of Invention

The invention aims to provide an implantation tool for fixing an orthopaedic prosthesis, which helps a doctor to simplify the operation process of fixing an acetabular cup, saves the operation time and improves the firmness of fixing the acetabular cup.

In order to achieve the above objects and other objects, the present invention provides an implant tool for fixing an orthopaedic prosthesis, comprising a push rod and a sleeve, wherein a distal end of the sleeve is provided with a connector, an implant is combined with the connector, and the push rod pushes the implant in the sleeve to be separated from the connector and enter the orthopaedic prosthesis.

Furthermore, the connecting piece is a clamping groove, and the near end of the implant is wholly or partially accommodated in the clamping groove.

Further, the sleeve comprises a first portion and a second portion provided with the connecting member, the first portion being located at a proximal end of the second portion, and the implantation tool further comprises a driving mechanism connected to the second portion for driving the second portion to rotate relative to the first portion.

Furthermore, the driving mechanism comprises a link mechanism and a push-assisted rod, one end of the link mechanism is rotatably connected with the push-assisted rod, the other end of the link mechanism is fixedly connected with the second part, and meanwhile, the part of the link mechanism between the two ends of the link mechanism is rotatably connected with the first part; the push-assisted rod drives the link mechanism to move, and the link mechanism drives the second part to rotate.

Furthermore, the push-aid rod and the first part and the second part of the sleeve are respectively provided with a first fulcrum, a second fulcrum and a third fulcrum, the connecting rod mechanism comprises a connecting rod with a bending shape, one end of the connecting rod is rotatably connected with the first fulcrum, the other end of the connecting rod is fixedly connected with the third fulcrum, and the connecting rod is rotatably connected with the second fulcrum at a bending position.

Furthermore, the far end of the first part is provided with a first cambered surface protruding towards the direction deviating from the near end of the first part, the near end of the second part is provided with a second cambered surface recessed towards the far end of the second part, and the second cambered surface is attached to the first cambered surface and can rotate along the first cambered surface.

Further, the distal end of the first portion is rotatably coupled to the proximal end of the second portion.

Furthermore, the push rod at least comprises an elastic section which can generate elastic deformation.

Further, the elastic section is a spiral structure or a hose.

Further, the sleeve comprises a first part and a second part provided with the connecting piece, and the proximal end of the second part is fixedly connected with the distal end of the first part.

Further, one part of the push rod is positioned in the second part, the other part of the push rod is positioned in the first part or on one side of the first part, a step surface is formed when the first part and the second part are connected, and the part of the push rod is used for abutting against the step surface.

Further, the implant is arc-shaped along the profile of the length direction, and at least one part of the clamping groove is arc-shaped along the axial direction of the sleeve.

Furthermore, a sleeve is arranged on the outer side of the sleeve, and the transverse section shape of the sleeve is matched with the inner cavity of the sleeve.

Furthermore, the clamping groove penetrates through the sleeve along the transverse direction of the sleeve to form an elastic clamping mechanism capable of generating elastic deformation, and the elastic clamping mechanism is used for clamping the implant.

In conclusion, the implant tool for fixing the orthopaedic prosthesis provided by the invention has the following advantages:

the implant tool comprises a push rod and a sleeve, a connecting piece is arranged at the far end of the sleeve, an implant is combined with the connecting piece, the push rod pushes the implant to be separated from the clamping groove to enter the orthopedic prosthesis in the sleeve, therefore, when the acetabular cup prosthesis is fixed, a screw hole does not need to be drilled on the acetabulum, the position of a patient does not need to be frequently adjusted, only the installation position of the implant on the acetabular cup prosthesis needs to be found, the implant is pushed by the push rod to be fixed with the acetabular cup prosthesis, in the fixing process, the acetabular cup prosthesis can be fixed with the acetabulum by means of the implant, the whole fixing operation process is simple, and the operation time is relatively short.

In particular, the sleeve of the implantation tool has a first part and a second part which can rotate relatively, so that the implant can enter the bone tissue of the human body through the installation position on the acetabular cup prosthesis at an arc-shaped angle, the implantation is convenient, and the arc-shaped angle is beneficial to the fixation of the implant.

Drawings

FIG. 1a is a perspective view of an acetabular cup according to an embodiment of the invention;

FIG. 1b is a front view of the acetabular cup shown in FIG. 1 a;

FIG. 2a is a perspective view of an implantation tool according to a first embodiment of the present invention;

FIG. 2b is an axial cross-sectional view of the implant tool shown in FIG. 2 a;

FIG. 3a is an end view of an implantation tool according to a first embodiment of the present invention, wherein the sleeve is circular in transverse cross-section;

FIG. 3b is an end view of an implantation tool according to a first embodiment of the present invention, wherein the sleeve has an oval-shaped transverse cross-section;

FIG. 3c is an end view of an implantation tool according to a first embodiment of the present invention, wherein the sleeve has a rectangular transverse cross-section;

FIG. 3d is an end view of an implantation tool according to a first embodiment of the present invention, wherein the lateral cross-section of the sleeve is crescent-shaped;

FIG. 4a is an axial cross-sectional view of a preferred implantation tool according to a first embodiment of the present invention;

FIG. 4b is a perspective view of the implantation tool shown in FIG. 4 a;

FIG. 5a is an axial cross-sectional view of a preferred implantation tool according to a first embodiment of the present invention;

FIG. 5b is a perspective view of the implantation tool shown in FIG. 5 a;

FIG. 6a is a top view of an implantation tool according to a second embodiment of the present invention, wherein the sleeve is not rotated;

FIG. 6b is an axial cross-sectional view of the implant tool shown in FIG. 6 a;

FIG. 7a is a top view of the sleeve of the implantation tool of FIG. 6a rotated;

fig. 7b is an axial cross-sectional view of the implant tool shown in fig. 7 a.

The reference numerals are explained below:

10-acetabular cup; 11-acetabular cup prosthesis; 111-slot; 112-scribing; 12-anchor sheet; 121-grooves;

20. 30-an implantation tool; 21. 31-a push rod; 22. 32-a sleeve; 22 a-the distal end of the sleeve; 22b, 32 a-first portion; 22c, 32 b-second part; 221-card slot; 222-lumen; 223-upper clamping arm; 224-lower clamp arm; 225-upper arm; 226-lower arm; 227-boss; 33-a linkage mechanism; 331-link; 311-a first fulcrum; 321-a second fulcrum; 322-third fulcrum; 312-an elastic segment; 34-push-aid rod.

Detailed Description

The implant tool for orthopaedic prosthesis fixation according to the present invention will be described in further detail with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

All numerical values herein are assumed to be modified by the term "about," whether or not explicitly indicated. In the context of using numerical values, the term "about" generally refers to a range that one of ordinary skill in the art would consider equivalent to the recited value (i.e., having the same function or result) and its vicinity. In many instances, the term "about" may include numerical values that are rounded to the nearest significant figure. Unless otherwise specified, other uses of the term "about" (i.e., in contexts other than the use of numerical values) can be assumed to have their ordinary and customary definitions, as can be understood and consistent with the context of this specification.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. The "orthopedic prosthesis" related to the invention includes but is not limited to acetabular cup, and also includes other artificial orthopedic implants which can act in vivo.

As used herein and in the claims, the term "lateral" refers to the side of the acetabular cup that faces the acetabular socket when implanted, or "lateral" refers to the side away from the anchor plate axis, and "medial" refers to the side of the acetabular cup that faces away from the acetabular socket when implanted, or "medial" refers to the side near the anchor plate axis, and "lateral" refers to the direction perpendicular to the sleeve axis, and "lateral" refers to the side in a longitudinal cross-section through the sleeve axis, and "proximal" refers to the end near the medical instrument operator, and "distal" refers to the end away from the medical instrument operator.

First, the present embodiment provides an acetabular cup 10 for implantation into an acetabular socket of a human body for fixation to achieve artificial total hip replacement, as shown in fig. 1a and 1 b. FIG. 1a is a perspective view of an acetabular cup 10 according to an embodiment of the invention, and FIG. 1b is a front view of the acetabular cup 10 shown in FIG. 1 a.

In particular, the acetabular cup 10 includes an acetabular cup prosthesis 11 and a plurality of anchor pads 12, the anchor pads 12 being configured to act as implants for securing the acetabular cup prosthesis 11. The number of the anchor pieces 12 is not limited to three in the drawing, and one or more anchor pieces 12 may be used as long as the fixing effect can be ensured. Wherein, the acetabular cup prosthesis 11 is provided with a through slot 111.

The fixing principle of the acetabular cup 10 is as follows: firstly, the acetabular cup prosthesis 11 is placed in the acetabular fossa (the implantation of the acetabular cup prosthesis 11 can be completed according to actual requirements and conventional surgical methods), then the anchor sheet 12 is fixed in the slotted hole 111 of the acetabular cup prosthesis 11 by using the implantation tool provided by the invention, and in the fixing process, the part of the anchor sheet 12 extending out of the slotted hole 111 is inserted into human bone tissue by means of the implantation tool, so that the acetabular cup 10 is firmly fixed in the acetabular fossa. Obviously, after the anchoring piece 12 is fixed on the acetabular cup prosthesis 11, a part of the anchoring piece is received in the slot 111 and fixed with the slot 111, and another part of the anchoring piece extends out of the slot 111 and extends towards the outer side of the acetabular cup prosthesis 11 to be inserted into bone tissue.

Furthermore, when the anchor piece 12 is plural, the plural anchor pieces 12 preferably extend along different directions outside the acetabular cup prosthesis 11 (as shown more clearly in fig. 1a), so that the heads of the anchor pieces 12 away from the acetabular cup prosthesis 11 do not intersect with each other, thereby fixing the acetabular cup 10 at different directions and angles, and further enhancing the fixation reliability of the acetabular cup 10. However, a plurality of the anchor pieces 12 may be randomly distributed on the acetabular cup prosthesis 11, and the present invention is not particularly limited, and the distribution of the anchor pieces 12 may be determined according to the actual fixing position and orientation of the acetabular cup 10. The head of the anchor sheet 12 is used for being inserted into human bone tissue, and the tail of the anchor sheet 12 opposite to the head is used for being attached to an artificial joint.

When the acetabular cup 10 is applied, operators can select the anchor sheets 12 with different sizes to fix the acetabular cup 10 according to the bone condition of patients so as to adapt to the treatment needs of different patients. In this embodiment, the size of the anchor sheet 12 is preferably: the length is 5.0-60.0 mm, the thickness is 0.2-10.0 mm, and the width is 2.0-20.0 mm. The anchor sheet 12 with the above dimensions can basically meet the treatment requirements of different patients, and the selected width and thickness are relatively small, so that in the subsequent revision surgery, large bone defects cannot occur at the position of the original anchor sheet 12, and the adverse effect on the surgery effect is reduced.

Further, the material of the anchor sheet 12 may be selected from metal materials, such as stainless steel, titanium alloy or cobalt-chromium alloy, etc., to ensure the fixing strength. Furthermore, the anchor sheet 12 is made of a biocompatible metal material, such as titanium alloy, medical stainless steel, etc. Alternatively, the anchor sheet 12 formed with its own curvature may be prepared by machining, wire cutting or etching, etc.

The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it is understood that the present invention includes, but is not limited to, the embodiments shown below, and any modifications based on the configurations provided by the above embodiments are within the scope of the present invention.

Example one

Referring to fig. 2a and 2b, the present embodiment provides an implantation tool 20, which includes a push rod 21 and a hollow sleeve 22, wherein a distal end of the sleeve 22 is provided with a slot 221, and one end of the slot 221 is communicated with a distal end 22a of the sleeve 22. The locking slot 221 may transversely penetrate the entire sleeve 22, may transversely penetrate only one side of the cavity 222 of the sleeve 22, or may not be cut through by the locking slot 221 at both sides of the cavity 222 of the sleeve 22. When the cavity walls on both sides of the inner cavity 222 are not cut through by the slot 221, the slot 221 may be formed on the cavity wall on one side of the inner cavity 222, or may be formed on the cavity walls on both sides of the inner cavity 222 (that is, the width of the slot 221 is greater than the width of the inner cavity 222).

In connection with open surgery, after implantation of acetabular cup prosthesis 11 in acetabular socket is completed, anchor tab 12 is inserted into notch 221 of sleeve 22 (proximal end of anchor tab 12 may be fully or partially received in notch 221), sleeve 22 carrying anchor tab 12 is then inserted into the surgical incision (preferably, the position of sleeve 22 relative to acetabular cup prosthesis 11 is determined based on score line 112 on acetabular cup prosthesis 11), and when distal end 22a of sleeve 22 (or the head of anchor tab 12) is in contact with the proximal end of notch 111, the operator may hold the proximal end of sleeve 22 (or a handle attached to the proximal end of sleeve 22) with one hand, and push rod 21 with the other hand to move along the cavity wall of sleeve 22 in the direction of notch 221 into contact with the tail of anchor tab 12, and then further push rod 21 to move forward such that anchor tab 12 is forced to move along notch 221 in the direction of sleeve 22 until anchor tab 12 is fully pushed into notch 111 (i.e., the tail of anchor tab 12 has been disengaged from notch 221 into notch 111). Obviously, during the process of pushing the anchor piece 12 into the slot hole 111, once the head of the anchor piece 12 is extended out of the slot hole 111, the bone tissue can be inserted for fixation. If a plurality of anchor pieces 12 are provided, the steps can be similarly performed to implant one by one, and finally the fixation of the whole acetabular cup in the acetabular fossa is completed. Here, it should be understood that by "open surgery" is meant that the internal anatomy of the total hip joint to be repaired is completely exposed, and thus the surgical incision is relatively large. Moreover, after the push rod 21 contacts the tail of the anchor piece 12, the stroke of the push rod 21 moving towards the direction of the slot 221 is at least equal to the length from the tail of the anchor piece 12 to the far end of the slot 111 (the length of the anchor piece 12 is greater than the depth of the slot 111), so that the anchor piece 12 can be smoothly inserted into the bone tissue.

The anchor segment 12 is generally arcuate in profile, the anchor segment 12 being primarily arcuate in length, and preferably at least a portion of the slot 221 is also arcuate in the axial direction of the sleeve 22 to match the anchor segment 12, which is also arcuate, so that the anchor segment 12 moves more smoothly within the slot 221. Preferably, the bending angle of the anchor sheet 12 along the length direction is greater than 0 ° and less than or equal to 75 °, and more preferably, the bending angle is between 5 ° and 45 °, which can provide a better effect for fixing the anchor sheet 12 and the acetabular cup 10.

Further, the profile (i.e., transverse cross-section) of the distal end 22a of the sleeve 22 may be configured as a circle as shown in fig. 3a, or as an ellipse as shown in fig. 3b, or as a rectangle as shown in fig. 3c, or as a crescent as shown in fig. 3d, however, the present invention includes but is not limited to these shapes, and may be configured as required according to actual requirements. For example, the sleeve 22 of the present embodiment may be inserted into a cannula during minimally invasive surgery, and the distal end 22a of the sleeve 22 is contoured to match the lumen of the cannula to facilitate insertion into the cannula. It will be appreciated that the end views of the sleeve 22 shown in figures 3a to 3d are all views from orthographic projection of the distal end 22a of the sleeve 22 in the proximal direction of the sleeve 22.

As a preferred embodiment, the slot 221 of the sleeve 22 has a positioning structure for positioning the anchor sheet 12, and the specific implementation of the positioning structure will be described in detail below, but this should not be taken as a limitation of the present invention, and any modifications made on the configuration provided by the present invention are within the scope of the present invention.

As shown in fig. 4a and 4b, the distal end 22a of the sleeve 22 is divided into elastic clamping mechanisms capable of generating elastic deformation by the slots 221, at this time, the slots 221 transversely penetrate through the sleeve 22, and the elastic clamping mechanisms are used for clamping the anchor sheet 12. Specifically, the elastic clamping mechanism includes an upper clamping arm 223 and a lower clamping arm 224, which are opposite and preferably symmetrically disposed, and a hollow clamping groove 221 is defined between the two clamping arms. When the anchor piece 12 is inserted into the slot 221, the upper and

lower arms

223 and 224 are forced to elastically deform and expand outward, thereby firmly clamping the anchor piece 12. Preferably, the elastic clamping mechanism can generate elastic deformation of 0.01-5.0 mm.

In another preferred embodiment, as shown in fig. 5a and 5b, the distal end 22a of the sleeve 22 is divided by a slot 221 into another resiliently deformable resilient retaining means, and likewise the slot 221 extends transversely through the sleeve 22. The other elastic clamping mechanism comprises an upper arm 225 and a lower arm 226 which are oppositely arranged and preferably symmetrically arranged, and a hollow clamping groove 221 is formed between the two arms. In order to better clamp the anchor sheet 12, the other elastic clamping mechanism is provided with at least one clamping portion (corresponding to the clamping portion provided on the groove wall of the clamping groove 221), and at the same time, the anchor sheet 12 is provided with at least one clamping and matching portion, and the anchor sheet 12 is further limited by matching of the at least one clamping portion and the at least one clamping and matching portion.

In this embodiment, the engaging portion is a protrusion 227, and the engaging portion is a groove 121. When the anchor piece 12 is inserted into the slot 221, the upper arm 225 and the lower arm 226 are forced to elastically deform to open outwards to clamp the anchor piece 12, and meanwhile, the boss 227 is inserted into the groove 121 of the anchor piece 12 to limit the position. Of course, the engaging portion may be a groove, and the engaging portion may be a boss. Alternatively, the engaging portion may be provided in the upper arm 225, the lower arm 226, or both the upper arm 225 and the lower arm 226.

In other embodiments, the anchor sheet 12 may be clamped in the clamping groove 221 only by the engagement of the engaging portion and the engaging mating portion, that is, the sleeve 22 is not provided with an elastic clamping mechanism.

With continued reference to fig. 2b, the sleeve 22 includes a first portion 22b and a second portion 22c, the locking slot 221 is disposed in the second portion 22c, and a proximal end of the second portion 22c is fixedly connected to a distal end of the first portion 22b, while at least the second portion 22c has the lumen 222 axially therethrough. The cavity 222 is configured to accommodate the free movement of the pushrod 21.

In one embodiment, the first portion 22b is a solid structure, and when in use, one part of the push rod 21 is located in the second portion 22c, and the other part is located at one side of the first portion 22 b. In another embodiment (not shown), the first portion 22b has the inner cavity 222 axially therethrough, and in use, a portion of the push rod 21 is located in the second portion 22c, and another portion is located in the first portion 22 b.

Preferably, the first portion 22b and the second portion 22c are connected to form a step surface, and the push rod 21 is L-shaped along the axial direction, so that when the push rod 21 is inserted into the second portion 22c, the portion of the push rod 21 can abut against the step surface, thereby limiting the stroke of the push rod 21 moving towards the proximal direction of the sleeve 22, and further facilitating the fixing operation. The first portion 22b and the second portion 22c may be formed separately or integrally. When the sleeve 22 is of a one-piece structure, the sleeve 22 has an inner cavity 222 running axially therethrough, and at this time, the push rod 21 can be integrally inserted into the sleeve 22 to work, and the length of the push rod 21 is greater than that of the sleeve 22, so that an operator can conveniently grip the proximal end of the push rod 21 to move.

Example two

The acetabular cup provided in this embodiment is substantially the same as the first embodiment, and only different points of the implantation tool will be described below. The first embodiment provides an implantation tool 20 that can only implant the anchor pad 12 into the predetermined slot 111 in the fixed direction, however, the first embodiment provides an implantation tool 30 that can adjust the implantation direction of the anchor pad 12 to insert into the predetermined slot 111.

Referring to fig. 6a, 6b, 7a and 7b, the present embodiment provides an implantation tool 30, which includes a push rod 31, a sleeve 32, and a driving mechanism, wherein the sleeve 32 includes a first portion 32a and a second portion 32b having a locking groove 221, the first portion 32a is disposed at a proximal end of the second portion 32b, and the driving mechanism is connected to the second portion 32b and is configured to drive the second portion 32b to rotate relative to the first portion 32 a. In another embodiment, the locking groove 221 may be disposed on the anchor sheet 12, and correspondingly, the second portion 32b of the sleeve 32 is provided with a protrusion that can be received in the locking groove 221. Obviously, whether the distal end of the sleeve 32 is provided with a catch or a projection, it is sufficient if the distal end of the sleeve is provided with a connector for engagement with the anchor pad.

In connection with minimally invasive surgery, after implantation of the acetabular cup prosthesis 11 in the acetabular socket has been completed, the anchor tab 12 is inserted into the notch 221 of the sleeve 32, after which the sleeve 32 carrying the anchor tab 12 is preferably inserted into a sleeve which has been inserted into the surgical incision and whose distal end has contacted the acetabular cup prosthesis 11, the position of the sleeve 32 relative to the acetabular cup prosthesis 11 being preferably determined in accordance with the score line 112 on the acetabular cup prosthesis 11, whereafter the second portion 32b of the sleeve 32 is driven by said drive mechanism to rotate relative to the first portion 32a until the distal end 22a of the sleeve 32 is rotated into alignment with the predetermined slot 111, and when the distal end 22a of the sleeve 32 (or the head of the anchor tab 12) is contacted with the proximal end of the corresponding slot 111, the push rod 31 in the sleeve 32 is moved in the direction of the notch 221 to contact the anchor tab 12, and the anchor tab 12 is further pushed along the notch 221 until the anchor tab 12 is completely inserted into the corresponding slot 111, thus, the implantation of the anchor sheet 12 at different positions can be completed, and the fixation of the acetabular cup and the acetabulum can be completed at the same time. For the same reason, when a plurality of anchor sheets 12 are provided, each anchor sheet 12 can be implanted according to the steps, and finally, the fixation of the whole acetabular cup is completed. It should be understood that the term "minimally invasive surgery" as used herein means that, before the surgery, a small surgical incision is first made on the corresponding part of the patient, and the operator performs total hip replacement through the surgical incision, so that the minimally invasive surgery has less surgical incision compared with the open surgery, and thus the minimally invasive surgery causes less damage to the patient and is beneficial to the physical recovery of the patient.

In a preferred embodiment of the present invention, the driving mechanism includes a link mechanism 33 and an auxiliary push rod 34, the auxiliary push rod 34 is a hollow structure, and the push rod 31 is slidably disposed in the auxiliary push rod 34. Specifically, one end of the link mechanism 33 is rotatably connected to the push rod 34, and the other end is fixedly connected to the second portion 32b of the connecting sleeve 32, while the portion of the link mechanism 33 located between the two ends thereof is rotatably connected to the first portion 32a of the connecting sleeve 32. When the sleeve 32 is inserted into the cannula, the operator can hold the proximal end of the first portion 32a (or a handle connected to the proximal end of the first portion 32 a) with one hand, and push the push-aid rod 34 with the other hand to move along the axial direction of the sleeve 32, thereby moving the link mechanism 33, and simultaneously the link mechanism 33 rotates the second portion 32b of the sleeve 32 relative to the first portion 32a, and when the second portion 32b of the sleeve 32 rotates to be aligned with the predetermined slot 111, the push-aid rod 34 stops being pushed. Then, the push rod 31 in the sleeve 32 is pushed further to move in a direction close to the anchor blade 12, and when the distal end of the push rod 31 contacts the tail of the anchor blade 12, the anchor blade 12 moves along the slot 221 under the further pushing of the push rod 31 to be completely separated from the slot 221 and fixed with the slot 111. Here, it should be appreciated that by driving the sleeve 32 to rotate by means of the push rod 34, it is ensured that the rotation angle is not affected by the push rod 31, as compared to driving the sleeve 32 to rotate directly by the push rod 31, thereby effectively pushing the anchor piece 12 into the slot 111.

Further, the link mechanism 33 includes a link 331 having a bent shape, and one end of the link 331 is rotatably connected to the boost rod 34, the other end of the link is fixedly connected to the second portion 32b of the sleeve 32, and the link 331 is rotatably connected to the first portion 32a of the sleeve 32 at a bent position. Specifically, a rotation fulcrum is disposed between opposite ends of the connecting rod 331, and is rotatably connected to the first portion 32a of the sleeve 32 through the rotation fulcrum. More specifically, the push-aid rod 34 is provided with a first fulcrum 311, one end of the connecting rod 33 is rotatably connected to the first fulcrum 311, the first portion 32a is provided with a second fulcrum 321, the rotating fulcrum of the connecting rod 331 is rotatably connected to the second fulcrum 321, the second portion 32b is provided with a third fulcrum 322, and the other end of the connecting rod 331 is fixedly connected to the third fulcrum 322, so that the connecting rod 331 can rotate around the rotating fulcrum in the moving process of the push-aid rod 34, and the second portion 32b of the sleeve 32 is further driven to rotate.

Alternatively, one part of the link 331 is located in the second portion 32b, and the other part is located in the first portion 32a or on one side of the first portion 32 a. For example, when the first portion 32a is a solid rod, another portion of the link 331 is located on one side of the first portion 32 a; when the first portion 32a is a hollow tube, another portion of the link 331 is located within the first portion 32a (shown in fig. 6b and 7 b).

Optionally, the distal end of the first portion 32a may be spaced from the proximal end of the second portion 32b to facilitate rotation of the second portion 32b relative to the first portion 32a about the second pivot point 321. Preferably, the distal end of the first portion 32a is a first arc surface protruding away from the proximal end thereof, and the proximal end of the second portion 32b is a second arc surface recessed toward the distal end thereof, the second arc surface being engaged with the first arc surface and being rotatable along the first arc surface.

In some embodiments, the distal end of the first portion 32a is rotatably connected to the proximal end of the second portion 32b, such as by a pin and a shaft, but other rotatable connections are also possible, and the invention is not limited thereto.

Then, as shown in fig. 7a and 7b, when the push rod 34 is moved in the distal direction of the sleeve 32 by the axial force, the second portion 32b of the sleeve 32 is rotated (for example, clockwise as shown in fig. 7b) in the proximal direction of the sleeve 32 relative to the first portion 32a by the link 331, and when the sleeve 32 is rotated to a certain angle, the rotation is stopped, and then, the push rod 31 is pushed to move the anchor piece 12 in the distal direction of the sleeve 32 along the slot until the anchor piece 12 completely enters the slot 111. Conversely, when the push-aid rod 34 is axially moved toward the proximal end of the sleeve 32, the second portion 32b of the sleeve 32 is rotated relative to the first portion 32a toward the distal end 22a of the sleeve 32 (e.g., counterclockwise as shown in fig. 7b) by the link 331.

Further, in order to adapt the angle of the second portion 32b of the sleeve 32 relative to the first portion 32a, at least a portion of the push rod 31 can be elastically deformed so as to move more smoothly within the sleeve 32, i.e., the push rod 31 includes at least one elastic section 312 that can be elastically deformed. The resilient section 312 may be disposed where the first portion 32a and the second portion 32b of the sleeve 32 meet.

In one embodiment, the elastic section 312 is a spiral structure, which may be formed by directly cutting the push rod 31, may be an additional component, such as a spiral spring, or may be a push rod that generates a large elastic deformation.

Finally, the preferred embodiments of the present invention are described above, but not limited to the scope of the disclosure of the above embodiments, for example, the driving mechanism for driving the sleeve to rotate is not limited to the linkage mechanism, but can also be a flexible driving mechanism, such as a flexible structure such as a wire, a rope or a belt, connected to the sleeve to drive the sleeve to rotate. Further, implants for fixation of acetabular cups are generally preferred to anchor plate-like structures to eliminate the step of drilling the acetabulum. In addition, the marking line is arranged on the acetabular cup prosthesis and is usually positioned at the edge of the acetabular cup prosthesis and used for indicating the installation position of the anchor sheet, and whether the anchor sheet reaches the preset installation position can be judged according to the marking line.

Then, compared with the prior art, the implantation tool at least comprises the push rod and the sleeve, the far end of the sleeve is provided with the connecting piece, when an implant is combined with the connecting piece, the push rod pushes the implant to be separated from the connecting piece in the sleeve to enter the acetabular cup prosthesis, so that when the acetabular cup prosthesis is fixed, a screw hole does not need to be drilled on the acetabulum, the position of a patient does not need to be frequently adjusted, only the installation position of the implant on the acetabular cup prosthesis needs to be found, the implant is pushed by the push rod to be fixed with the acetabular cup prosthesis, the acetabular cup prosthesis can be fixed with the acetabulum by the implant in the fixing process, the whole operation process is relatively simple, and the operation time is short.

The sleeve of the implantation tool can be driven by a driving mechanism to rotate relatively, so that the implant can enter the bone tissue of a human body at the installation position on the acetabular cup prosthesis with an arc-shaped angle, the implantation is convenient, and the arc-shaped angle is beneficial to the fixation of the implant.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. An implantation tool for fixing an acetabular cup, wherein the acetabular cup comprises an acetabular cup prosthesis and an implant, the acetabular cup prosthesis is characterized by comprising a push rod and a sleeve, a connecting piece is arranged at the distal end of the sleeve, the implant is combined with the connecting piece, and the implant is pushed into the sleeve through the push rod to be separated from the connecting piece and enter the acetabular cup prosthesis; the push rod at least comprises an elastic section which can generate elastic deformation; the sleeve comprises a first portion and a second portion provided with the connecting piece, the first portion is located at the near end of the second portion, the implantation tool further comprises a driving mechanism connected with the second portion, the driving mechanism comprises a connecting rod mechanism and an auxiliary push rod, one end of the connecting rod mechanism is connected with the auxiliary push rod in a rotating mode, the other end of the connecting rod mechanism is fixedly connected with the second portion, meanwhile, the portion, located between the two ends of the connecting rod mechanism, of the connecting rod mechanism is connected with the first portion in a rotating mode, the auxiliary push rod drives the connecting rod mechanism to move, and the connecting rod mechanism drives the second portion to rotate relative to the first portion.

2. The implant tool for acetabular cup fixation of claim 1, wherein the connector is a socket and the proximal end of the implant is received in whole or in part in the socket.

3. The implant tool for acetabular cup fixation of claim 1, wherein the push-assist rod and the first and second portions of the sleeve each have a first pivot, a second pivot, and a third pivot disposed thereon, the linkage mechanism includes a link having a bent shape, one end of the link is rotatably connected to the first pivot, the other end of the link is fixedly connected to the third pivot, and the link is rotatably connected to the second pivot at a bend.

4. The implant tool for acetabular cup fixation of claim 1, wherein the distal end of the first portion has a first arcuate surface that is convex away from the proximal end thereof, and the proximal end of the second portion has a second arcuate surface that is concave toward the distal end thereof, the second arcuate surface engaging and rotatable along the first arcuate surface.

5. The implant tool for acetabular cup fixation of claim 1, wherein a distal end of the first portion is rotationally coupled to a proximal end of the second portion.

6. The implant tool for acetabular cup fixation of claim 1, wherein the resilient segment is a helical structure or a hose.

7. The implant tool for acetabular cup fixation of claim 2, wherein the implant is arcuate in profile along a length thereof, and at least a portion of the catch is arcuate along an axial direction of the sleeve.

8. An implant tool for acetabular cup fixation according to claim 1 wherein a sleeve is provided on the outside of the sleeve, the sleeve having a transverse cross-sectional shape that matches the shape of the inner cavity of the sleeve.

9. The implant tool for acetabular cup fixation of claim 2, wherein the retaining groove extends through the sleeve in a transverse direction of the sleeve to form a resiliently deformable resilient retaining mechanism for retaining the implant.