CN111616839A

CN111616839A - Replacement prosthesis for semi-hip joint and surgical tool

Info

Publication number: CN111616839A
Application number: CN202010486009.3A
Authority: CN
Inventors: 王彩梅; 周梦
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2020-09-04

Abstract

The invention provides a replacement prosthesis of a half hip joint and a surgical tool, wherein the replacement prosthesis of the half hip joint comprises: the main body is provided with an insertion end and a repair end which are arranged oppositely, the insertion end of the main body is inserted into the femoral head, and the main body is provided with a porous structure; the joint layer is arranged at the repairing end of the main body, and the end face, far away from the main body, of the joint layer is a curved surface; and the guide structure is arranged at the insertion end of the main body. Through the technical scheme provided by the application, the problem that the femoral head necrosis in the middle period cannot be effectively treated in the prior art can be solved.

Description

Replacement prosthesis for semi-hip joint and surgical tool

Technical Field

The invention relates to the technical field of prostheses, in particular to a replacement prosthesis of a half hip joint and an operation tool.

Background

The femoral head necrosis is a disease that the femoral head structure is changed, the femoral head is collapsed, cartilage is damaged, and hip joint pain and movement disorder are finally caused due to osteonecrosis and self-repair caused by interruption of femoral head blood supply. Among them, femoral head necrosis is divided into three types of early stage, middle stage and late stage. The treatment of early femoral head necrosis can be carried out by a medullary core decompression method, aiming at retaining the femoral head of a patient and delaying the time of joint replacement.

While the medullary core decompression method has poor treatment effect on the femoral head necrosis in the middle period, if the medullary core decompression method is not used for treatment, 80 percent of patients can subsequently have osteoarthritis and deep collapse of joint surfaces, and then the later period which cannot be tolerated is reached, so that hip joint replacement is forced to be carried out. However, hip replacement surgery will remove a greater amount of healthy bone tissue, as well as the entire healthy cartilage, while addressing the localized collapse, which can result in extensive damage to the articular surface. In addition, once the artificial joint is worn and loosened, the artificial joint may undergo two or even multiple joint revision surgeries, which causes more stress and pain to the patient.

Therefore, the prior art has the problem that the femoral head necrosis in the middle stage cannot be effectively treated.

Disclosure of Invention

The invention provides a replacement prosthesis of a half hip joint and an operation tool, which aim to solve the problem that the femoral head necrosis in the middle stage cannot be effectively treated in the prior art.

According to one aspect of the present invention, there is provided a semi-hip replacement prosthesis comprising: the main body is provided with an insertion end and a repair end which are arranged oppositely, the insertion end of the main body is inserted into the femoral head, and the main body is provided with a porous structure; the joint layer is arranged at the repairing end of the main body, and the end face, far away from the main body, of the joint layer is a curved surface; and the guide structure is arranged at the insertion end of the main body.

Furthermore, the replacement prosthesis of the half hip joint also comprises an anti-rotation structure, and the anti-rotation structure is arranged on the main body.

Further, the anti-rotation structure comprises at least two convex ribs which are arranged on the outer wall of the main body at intervals, the convex ribs extend in the direction of the insertion end of the main body pointing to the repair end of the main body, and the height dimension of the convex ribs is between 0.5mm and 2 mm.

Further, the main body is of a conical structure, the outer diameter of the main body is gradually reduced in the direction away from the joint layer, and the conical degree of the main body is between 35 degrees and 85 degrees.

Further, the articulating layer is made of a wear resistant metallic material or the outer surface of the articulating layer has a wear resistant coating.

Further, the guide structure comprises a guide pillar and a conical head, the guide pillar and the conical head are both arranged coaxially with the main body, the sum of the length sizes of the guide pillar and the conical head is between 3mm and 6mm, and the conical head gradually shrinks in the direction away from the joint layer.

According to another aspect of the present invention, there is provided a surgical tool for implanting the above-provided replacement prosthesis for a half hip joint in a human body, the surgical tool comprising: the positioning depth finder comprises a positioning part and a guide part arranged on the positioning part, wherein the guide part is provided with a first through hole, and the positioning part can be matched with the femoral head so that the axis of the first through hole is superposed with the axis of the femoral head; the guide pin is detachably matched with the first through hole, and the guide pin and the guide part are provided with scale marks; the cutter is provided with a second through hole, the second through hole and the cutter are coaxially arranged, the guide pin is detachably matched with the second through hole, and the overall dimension of the drilling end of the cutter is matched with the overall dimension of the prosthetic replacement of the half hip joint.

Further, the positioning part comprises a support and a plurality of support legs, the plurality of support legs are arranged on the support at intervals along the circumferential direction of the support, one ends of the support legs, far away from the support, are matched with the femoral head, and at least part of the support legs can move relative to the support.

Further, support piece has the mounting hole, and the guide portion is movably worn to establish in the mounting hole, and a plurality of stabilizer blades enclose and establish the periphery at the mounting hole, and the both ends of guide portion all are provided with spacing convex part, and the projection of spacing convex part on location portion is located the outside of mounting hole.

Further, be provided with first breach on the outer wall of guide portion, first breach is linked together with first through-hole, is provided with the second breach on the outer wall of cutter, and the second breach communicates with the second through-hole, and the scale mark of guide pin can be followed first breach and second breach and expose.

Furthermore, the surgical tool also comprises a test die, the external dimension of the test die is the same as that of the replacement prosthesis of the half hip joint, and the test die is detachably connected with the guide part.

By applying the technical scheme of the invention, the half hip joint replacement prosthesis comprises a main body, a joint layer and a guide structure, wherein the insertion end of the main body is inserted into the femoral head, and the main body is provided with a porous structure which is beneficial to the fusion of the femoral head and the main body. The joint layer is arranged at the repairing end of the main body, the end face, far away from the main body, of the joint layer is a curved surface, the guide structure is arranged at the inserting end of the main body, and the guide structure can play a role in guiding when the main body is inserted into a femoral head. By adopting the structure, when a patient is in the middle stage of femoral head necrosis, only the necrotic femoral head can be removed, healthy bone tissues and cartilage are reserved, after the replacement prosthesis of the half hip joint is implanted into a human body, the replacement prosthesis can replace the removed femoral head, and as the end surface of the joint layer, which is far away from the main body, is a curved surface, the curved surface can be matched with the peripheral bone tissues and cartilage of the curved surface, and finally the effect of effectively treating the middle stage femoral head necrosis is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a partial hip replacement prosthesis provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a cross-sectional view of a replacement prosthesis for a half hip joint provided in accordance with an embodiment of the present invention;

FIG. 3 shows a cross-sectional view of the articulating layer of FIG. 1;

FIG. 4 shows a cross-sectional view of the body and guide structure of FIG. 1;

FIG. 5 is a schematic structural diagram of a depth finder for positioning a surgical tool provided in accordance with an embodiment of the present invention;

FIG. 6 illustrates a cross-sectional view of a positioning depth finder of a surgical tool provided in accordance with an embodiment of the present invention;

FIG. 7 shows a top view of the positioning portion of FIG. 5;

FIG. 8 shows an isometric view of the locating portion of FIG. 5;

fig. 9 is a schematic view illustrating the cooperative positioning of a depth finder of a surgical tool with a femoral head according to an embodiment of the present invention;

figure 10 illustrates a schematic view of a surgical tool provided in accordance with an embodiment of the present invention guiding a lead into a femoral head;

FIG. 11 illustrates a schematic structural view of a knife of a surgical tool provided in accordance with an embodiment of the present invention;

FIG. 12 illustrates a cross-sectional view of a cutter of a surgical tool provided in accordance with an embodiment of the present invention;

figure 13 illustrates a schematic view of a cutter of a surgical tool provided in accordance with an embodiment of the present invention drilling into a femoral head along a guide pin;

FIG. 14 shows a cross-sectional view at A-A in FIG. 13;

FIG. 15 is a schematic view of the assembly of the positioning depth finder of the surgical tool and the test mold according to the embodiment of the present invention;

fig. 16 is a cross-sectional view of a positioning depth finder and a trial mold of a surgical tool according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a main body; 11. a first mounting groove; 20. a joint layer; 21. a body; 22. mounting a column; 23. a second mounting groove; 30. a guide structure; 31. a guide post; 32. a conical head; 40. an anti-rotation structure; 41. a rib is protruded; 50. positioning a depth finder; 51. a positioning part; 511. a support member; 5111. mounting holes; 512. a support leg; 52. a guide section; 521. a limiting convex part; 522. a first notch; 53. a first through hole; 60. guiding a needle; 70. a cutter; 71. a second through hole; 72. a second notch; 80. and (6) testing the mold.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, the present invention provides a semi-hip replacement prosthesis, which includes a main body 10, an articulating layer 20 and a guide structure 30. Wherein the main body 10 has an insertion end and a repair end which are oppositely arranged, the joint layer 20 is arranged at the repair end of the main body 10, and the guide structure 30 is arranged at the insertion end of the main body 10. Specifically, the insertion end of the main body 10 is inserted into the femoral head, and since the main body 10 has a porous structure, after the main body 10 is inserted into the femoral head, the porous structure is advantageous for the femoral head to grow into, so that the fusion effect can be improved. The end surface of the joint layer 20 far away from the main body 10 is a curved surface, which is convenient for smooth transition with the retained healthy bone tissue and cartilage, and ensures the integrity of the femoral head of the patient. The porous structure on the main body is a bone-like trabecula porous structure printed by 3D, has an excellent osseointegration function and a physiological bone self-healing function, and has an expected effect of reconstructing excellent bone and joint functions, wherein the pore diameter is 0.3-1 mm, and the porosity is 50-80%.

By applying the replacement prosthesis of the half hip joint provided by the embodiment, when a patient is in the middle stage of femoral head necrosis, only the necrotic femoral head can be removed, and healthy bone tissues and cartilage are reserved, when the replacement prosthesis is implanted into a human body, the guide structure 30 positioned at the insertion end of the main body can play a role in positioning and guiding, and after the replacement prosthesis is inserted into the human body, the main body 10 with the porous structure is convenient for the femoral head to grow in, so that the fusion effect is ensured. Moreover, the curved surface of the joint layer 20 facilitates smooth transition of the joint layer 20 and the remaining healthy bone tissue and cartilage located at the periphery thereof, and can ensure the implantation effect, thereby achieving the effect of effectively treating femoral head necrosis at the middle stage.

In this embodiment, the semi-hip replacement prosthesis further includes an anti-rotation structure 40, and the anti-rotation structure 40 is provided on the body 10. In and after the replacement prosthesis is inserted into the femoral head, the anti-rotation structure 40 may function to prevent rotation of the replacement prosthesis, which may improve assembly accuracy and the stability of the replacement prosthesis in the femoral head of the patient.

As shown in fig. 1, the anti-rotation structure 40 includes at least two ribs 41, the at least two ribs 41 are disposed on the outer wall of the main body 10 at intervals, and the ribs 41 can prevent rotation. Wherein the provision of the at least two ribs 41 serves to ensure that the replacement prosthesis is inserted in a predetermined direction during insertion of the replacement prosthesis into the femoral head. If only set up a protruding muscle on the outer wall of main part, at the in-process that inserts, the main part probably takes place the skew, can't guarantee the assembly precision. In the present embodiment, the rib 41 extends in a direction in which the insertion end of the body 10 is directed to the repair end of the body 10, and the height dimension of the rib 41 is between 0.5mm and 2 mm. Specifically, the height dimension of the bead refers to the height dimension of the bead protruding from the outer wall of the main body. Wherein, the height dimension of the convex rib can be set to be 1mm and 1.5 mm. Wherein, the quantity of protruding muscle is between 2 to 8, so can enough realize preventing changeing, is convenient for process again.

In this embodiment, the body 10 is of a tapered configuration, with the outer diameter of the body 10 tapering away from the articulating layer 20, thus facilitating insertion of the body into the femoral head. Wherein the taper of the body 10 is between 35 ° and 85 °. Specifically, the taper of the body may be set to any of 40 °, 50 °, 60 °, 70 °, 80 °, and the remaining values between 35 ° and 85 °.

Wherein the articulating layer 20 is made of a wear resistant metallic material or the outer surface of the articulating layer 20 has a wear resistant coating. Specifically, the articulating layer 20 includes the following three structures:

the first method comprises the following steps: the joint layer is made of hard wear-resistant materials (such as cobalt, chromium and molybdenum) such as cobalt, chromium and molybdenum, the surface of the joint layer is subjected to high polishing treatment and is connected with the main body through a cone or a thread, and the main body is made of a titanium alloy material with a porous structure; and the second method comprises the following steps: the joint layer and the main body are made of titanium alloy materials, integrated 3D printing processing is adopted, and the outer surface of the joint layer is provided with a wear-resistant coating; and the third is that: the joint layer and the main body are made of hard wear-resistant materials such as cobalt, chromium, molybdenum and the like, and are printed and processed in an integrated 3D mode, and no wear-resistant coating is arranged on the surface of the joint layer.

As shown in fig. 1, the guiding structure 30 includes a guiding post 31 and a conical head 32, the guiding post 31 and the conical head 32 are both disposed coaxially with the main body 10, the conical head 32 gradually shrinks in a direction away from the articulating layer 20, and the conical head and the guiding post cooperate to perform positioning and guiding functions during the process of inserting the main body into the femoral head. Wherein, the sum of the length dimensions of the guide pillar 31 and the conical head 32 is between 3mm and 6 mm. Specifically, the sum of the length dimensions of the guide post 31 and the tapered head 32 may be set to any of the remaining values of 4mm, 5mm, and 3mm to 6 mm.

As shown in fig. 2 to 4, in the present embodiment, the articulating layer 20 includes a body 21 and a mounting post 22, which is disposed on the body. Wherein, a first installation groove 11 is provided on the main body 10, and the installation column 22 is inserted in the first installation groove 11. Specifically, the erection column can be connected with modes such as the first mounting groove accessible awl is connected or threaded connection, as long as can realize firm the connection can.

Specifically, a second mounting groove 23 is provided at a side of the body 21 facing the main body 10, and an end of the main body 10 far from the guide structure 30 is inserted in the second mounting groove 23. By the body 10 cooperating with the second mounting groove 23 and the mounting post 22 cooperating with the first mounting groove 11, it can be ensured that the articulating layer 20 is securely assembled to the body 10. In the present embodiment, the second mounting groove 23 is an annular groove.

As shown in FIGS. 5-16, another embodiment of the present invention provides a surgical tool for implanting the above-provided semi-hip joint replacement prosthesis into a human body, the surgical tool including a depth finder 50, a guide pin 60, and a cutter 70. The positioning depth finder 50 comprises a positioning part 51 and a guiding part 52 arranged on the positioning part 51, the guiding part 52 is provided with a first through hole 53, and the positioning part 51 can be matched with the femoral head to enable the axis of the first through hole 53 to coincide with the axis of the femoral head, so that the necrotic part of the femoral head of a patient can be removed by matching a guide pin and a cutter. Specifically, the guide pin 60 is detachably fitted to the first through hole 53, and after the axis of the first through hole coincides with the axis of the femoral head with the use of the depth finder, the guide pin is inserted into the first through hole and then inserted into the femoral head through the first through hole. Wherein, the guide pin 60 and the guide part 52 are both provided with scale marks, so as to conveniently record the depth of the guide pin inserted into the femoral head. Specifically, the cutter 70 has a second through hole 71, the second through hole 71 is coaxially arranged with the cutter 70, the guide pin 60 is detachably matched with the second through hole 71, the positioning depth finder is removed after the guide pin is inserted into the femoral head, then the cutter is sleeved on the guide pin through the second through hole, then the cutter is moved along the guide pin, and the necrotic part of the femoral head is removed by the cutter. The overall dimension of the drilling end of the cutter 70 is matched with the overall dimension of the replacement prosthesis of the half hip joint, and the recess drilled on the femoral head by the cutter can ensure the replacement prosthesis to be implanted smoothly.

By applying the surgical tool provided by the embodiment, the positioning depth finder is firstly utilized to position, then the guide pin is inserted into the femoral head through the first through hole of the positioning depth finder, then the positioning depth finder is taken down from the guide pin, then the cutter is sleeved on the guide pin through the second through hole, and the guide pin is utilized to position and guide the cutter so as to remove the necrotic part of the femoral head of the patient. The surgical tool is convenient for implanting the provided half hip joint replacement prosthesis into a human body, and can ensure the implantation precision.

As shown in fig. 5 to 9, the positioning portion 51 includes a support 511 and a plurality of legs 512, the plurality of legs 512 are disposed on the support 511 at intervals along the circumferential direction of the support 511, and one ends of the legs 512 away from the support 511 are engaged with the femoral head. When the positioning depth finder is used for positioning, the guide portion 52 is first attached to the femoral head, and then the legs 512 are attached to the femoral head, thereby completing the positioning. Wherein at least a portion of the legs 512 are movable relative to the support 511 to facilitate engagement of the legs with the femoral head. In the present embodiment, the positioning portion 51 includes four legs, two legs on one diagonal are fixedly connected to the supporting member, and two legs on the other diagonal are movable relative to the supporting member 511. Specifically, the leg is movable relative to the support in the axial direction of the guide portion.

In other embodiments, the legs may all be fixedly disposed on the support. Taking the example that the support is fixedly provided with four support legs, the positioning depth finder is placed on the femoral head under the condition that the femoral head is a spherical body, and the support legs of the positioning depth finder are ensured to be simultaneously contacted with the femoral head so as to complete positioning. Under the condition that the femoral head is an ellipsoid, the positioning depth finder is placed on the femoral head, the support legs on two opposite angles are contacted with the femoral head, and the other two support legs have equal distance from the femoral head, so that the positioning can be completed. Moreover, if the femoral head is a spherical body, the number of the support legs can be adjusted according to the use requirement, for example, three, five, six, eight or other support legs are provided, as long as the positioning can be realized.

As shown in fig. 7 and 8, the support 511 has a mounting hole 5111, the guide part 52 is movably inserted into the mounting hole 5111, the plurality of legs 512 surround the mounting hole 5111, the two ends of the guide part 52 are provided with limit protrusions 521, and the projection of the limit protrusions 521 on the positioning part 51 is located outside the mounting hole 5111. The position of the guide part in the mounting hole can be limited by arranging the limiting convex part, and the guide part is prevented from falling off from the mounting hole. Wherein, spacing convex part is including setting up the spacing boss on the outer wall of guide portion, and the shape of spacing boss does not do the restriction, as long as can carry on spacingly to guide portion can. In the present embodiment, both ends of the guide portion are provided with annular bosses.

As shown in fig. 7 and 8, the support member is a ring-shaped support member, and one side of the ring-shaped support member is provided with a notch, which is used for facilitating reading and the like.

In order to ensure the accuracy of the insertion depth of the guide pin, a first notch 522 is provided on the outer wall of the guide portion 52, the first notch 522 is communicated with the first through hole 53, a second notch 72 is provided on the outer wall of the cutter 70, the second notch 72 is communicated with the second through hole 71, and the scale marks of the guide pin 60 can be exposed from the first notch 522 and the second notch 72. In this embodiment, the first notch is disposed on the limiting boss at the top of the guiding portion, and the second notch is disposed in the middle of the cutter.

As shown in fig. 15 and 16, the surgical tool further includes a test mold 80, the outer dimension of the test mold 80 is the same as that of the prosthetic for a hemihip joint, the test mold 80 is detachably connected to the guide portion 52, and the legs of the positioning portion are abutted against the outer wall of the test mold. In this embodiment, be provided with the external screw thread on the outer wall of the spacing boss of guide portion lower extreme, the top of examination mould is provided with the internal thread, examination mould and guide portion threaded connection. Wherein the test die is manufactured by a machining mode, and the part below the internal thread has the same shape as the replacement prosthesis.

In particular, the trial mold corresponds to a replacement for the replacement prosthesis because the replacement prosthesis is of a sterile package having a variety of sizes and, once the package is opened and the sterilization conditions are compromised, the replacement prosthesis must be discarded, and therefore, for medical devices, the prosthesis package cannot be opened until a particular size replacement prosthesis is determined for use. It is therefore desirable to perform trial installations using trial molds in place of replacement prostheses to determine which replacement prosthesis to select and whether the replacement prosthesis is suitable for implantation.

In this embodiment, the tool is a reamer. Wherein, the surgical tool also comprises a prosthesis perspective film and a vernier caliper.

The device provided by the embodiment is used as follows:

(1) firstly, shooting an X-ray film, then calling a prosthesis template, comparing the prosthesis template with the X-ray film before an operation, and selecting a proper prosthesis;

(2) measuring in an operation, measuring the diameter of the ball head by using a vernier caliper, and determining the maximum value and the minimum value of the diameter of the ball head by performing cross measurement for multiple times;

(3) placing the positioning depth finder on the femoral head, and positioning by matching the positioning part with the guide part;

(4) then inserting the guide pin into the femoral head through the first through hole of the positioning depth finder so as to guide the guide pin;

(5) then taking down the positioning depth finder from the guide pin, and drilling the reamer into the femoral head along the guide pin;

(6) installing a test mold;

(7) finally the prosthesis is installed.

When the guide needle is guided, the guide needle is stopped when the scale corresponding to the guide needle scale line is A + H, wherein A is 0-10 mm, and H is the sum of the heights of the main body and the joint layer. Wherein A represents the distance of the scale on the guide pin from the scale line of the positioning depth finder, ideally 0, i.e. it is desirable that the two scales coincide to mark the depth of implantation of the guide pin. However, the guide pin needs to be hammered into the femoral head, and the coincidence of two lines cannot be guaranteed, so that the A is used for recording, namely the A is used for compensating the difference between the scale lines in the future, and therefore the accurate processing depth is provided for the reamer.

Through the device provided by the embodiment, the stress environment of a femoral head pathological change area can be effectively improved in the early stage of femoral head diseases, rapid stress collapse caused by the pathological change area is resisted, the excellent osseointegration function and the physiological bone self-healing function of a 3D printing bone trabecula porous structure are fully utilized, and the expected effects of excellent bone and joint functions are reconstructed.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A semi-hip replacement prosthesis, comprising:

the femoral head repairing device comprises a main body (10) and a repairing device, wherein the main body (10) is provided with an inserting end and a repairing end which are oppositely arranged, the inserting end of the main body (10) is inserted into a femoral head, and the main body (10) is provided with a porous structure;

the joint layer (20) is arranged at the repairing end of the main body (10), and the end face, far away from the main body (10), of the joint layer (20) is a curved surface;

a guide structure (30) disposed at an insertion end of the body (10).

2. The partial hip replacement prosthesis according to claim 1 further comprising an anti-rotation feature (40), wherein the anti-rotation feature (40) is provided on the body (10).

3. Half hip joint replacement prosthesis according to claim 2, characterized in that the anti-rotation structure (40) comprises at least two ribs (41), at least two ribs (41) being arranged at intervals on the outer wall of the body (10), the ribs (41) extending in the direction from the insertion end of the body (10) towards the prosthetic end of the body (10), the ribs (41) having a height dimension of between 0.5mm and 2 mm.

4. Half hip joint replacement prosthesis according to claim 1, characterised in that said body (10) is of conical configuration, the outer diameter of said body (10) decreasing in a direction away from said articular layer (20), the taper of said body (10) being comprised between 35 ° and 85 °.

5. Replacement prosthesis for the half hip joint according to claim 1, characterized in that the articular layer (20) is made of wear-resistant metal material or the outer surface of the articular layer (20) has a wear-resistant coating.

6. Half hip joint replacement prosthesis according to claim 1, characterized in that said guiding structure (30) comprises a guide post (31) and a conical head (32), said guide post (31) and said conical head (32) being arranged coaxially to said main body (10), the sum of the length dimensions of said guide post (31) and said conical head (32) being comprised between 3mm and 6mm, said conical head (32) tapering in a direction away from said articular layer (20).

7. A surgical tool for implanting the semi hip joint replacement prosthesis of any one of claims 1 to 6 into the body, the surgical tool comprising:

the positioning depth finder (50) comprises a positioning part (51) and a guide part (52) arranged on the positioning part (51), wherein the guide part (52) is provided with a first through hole (53), and the positioning part (51) can be matched with a femoral head so that the axis of the first through hole (53) coincides with the axis of the femoral head;

the guide pin (60) is detachably matched with the first through hole (53), and scale marks are arranged on the guide pin (60) and the guide part (52);

the cutter (70) is provided with a second through hole (71), the second through hole (71) is coaxially arranged with the cutter (70), the guide pin (60) is detachably matched with the second through hole (71), and the external dimension of the drilling end of the cutter (70) is matched with the external dimension of the prosthetic replacement of the half hip joint.

8. The surgical tool according to claim 7, wherein the positioning portion (51) comprises a support (511) and a plurality of legs (512), the plurality of legs (512) being arranged on the support (511) at intervals along a circumferential direction of the support (511), an end of the legs (512) remote from the support (511) engaging the femoral head, at least part of the legs (512) being movable relative to the support (511).

9. The surgical tool according to claim 8, wherein the support member (511) has a mounting hole (5111), the guide portion (52) is movably inserted into the mounting hole (5111), the plurality of legs (512) are arranged around the periphery of the mounting hole (5111), both ends of the guide portion (52) are provided with limit protrusions (521), and the projection of the limit protrusions (521) on the positioning portion (51) is located outside the mounting hole (5111).

10. The surgical tool according to claim 7, wherein a first notch (522) is provided on an outer wall of the guide portion (52), the first notch (522) communicates with the first through hole (53), a second notch (72) is provided on an outer wall of the cutter (70), the second notch (72) communicates with the second through hole (71), and a scale line of the guide pin (60) can be exposed from the first notch (522) and the second notch (72).

11. The surgical tool of claim 7, further comprising a trial mold (80), the trial mold (80) having the same outer dimensions as the replacement prosthesis of the hemi-hip joint, the trial mold (80) being removably attachable to the guide (52).