CN216676040U

CN216676040U - Bionic short femoral stem prosthesis

Info

Publication number: CN216676040U
Application number: CN202123158664.5U
Authority: CN
Inventors: 张志亮
Original assignee: Beijing Lidakang Technology Co Ltd
Current assignee: Beijing Lidakang Technology Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-06-07
Anticipated expiration: 2031-12-13

Abstract

The utility model relates to a femoral stem prosthesis, in particular to a bionic short-type femoral stem prosthesis, which has the technical scheme that: the artificial limb prosthesis comprises a prosthesis body and a handle cone, wherein the handle cone inclines to one side of the prosthesis body along the direction from the far end to the near end of the prosthesis body, a bionic bulge is formed on one side of the prosthesis body, and the bionic bulge bulges towards the direction departing from the handle cone; the aim of reducing the amount of osteotomy so that the patient has more bone reserve is achieved.

Description

Bionic short femoral stem prosthesis

Technical Field

The utility model relates to a femoral stem prosthesis, in particular to a bionic short-type femoral stem prosthesis.

Background

Total hip replacement is an effective means for treating hip joint diseases, and achieves the purposes of relieving pain, recovering function or correcting deformity by implanting femoral stem prosthesis and artificial acetabular cup to replace diseased or malformed hip joint.

A femoral stem prosthesis described in the related art includes a prosthesis body for being inserted into a femoral medullary cavity, and a stem awl for installing an acetabular cup, wherein the stem awl is formed at a proximal end of the prosthesis body, and the prosthesis body needs to be designed into a long stem-shaped structure in order to ensure that the prosthesis body has a sufficient contact area with the medullary cavity so as to enable the prosthesis body to have good stability; however, since the prosthesis body is relatively long, in order to prevent the end of the prosthesis body from colliding with the wall of the medullary cavity during insertion into the medullary cavity, it is often necessary to provide the proximal end of the femur with a relatively large bone-cutting amount, so that the prosthesis body is inserted directly into the medullary cavity as far as possible in the proximal to distal direction, which necessarily reduces the bone retention of the patient.

SUMMERY OF THE UTILITY MODEL

In order to reduce the amount of osteotomy so that the patient has more bone remaining, the utility model provides a bionic short femoral stem prosthesis.

The utility model provides a bionic short femoral stem prosthesis, which adopts the following technical scheme:

the utility model provides a bionical short type femoral stem prosthesis, includes prosthesis body and handle awl, handle awl along the direction from prosthesis body distal end to near-end, to one side slope of prosthesis body, one side shaping of prosthesis body has bionical arch, and bionical arch is protruding to the direction that deviates from the handle awl.

By adopting the technical scheme, the bionic bulge is matched with the shape of the cavity wall of the medullary cavity at the proximal end of the femur, and the stability of the whole prosthesis body can be further improved by supporting the bionic bulge by the cavity wall of the medullary cavity, so that the prosthesis body can obtain good postoperative stability even if the length of the prosthesis body is reduced; the reduction in length of the prosthesis body eliminates the need for a larger osteotomy volume during surgery, thereby allowing the patient to have more bone remaining.

Optionally, the prosthesis body is provided with a plurality of anti-slip grooves formed around the circumference of the prosthesis body, and the anti-slip grooves are distributed at intervals between the proximal end and the distal end of the prosthesis body.

By adopting the technical scheme, as the bone grows in, the bone or tissue grows and is embedded into the anti-falling groove, so that the contact area between the prosthesis body and the inner part of the medullary cavity is increased, and the prosthesis body is effectively prevented from falling out of the medullary cavity; under the condition, the prosthesis body has good growth and fixation stability while the volume of the prosthesis body is reduced to reduce the amount of osteotomy.

Optionally, the distal end of the prosthesis body is formed with a tapered anti-snag end, the diameter of which decreases in a direction away from the proximal end of the prosthesis body.

By adopting the technical scheme, the possibility of thigh pain caused by the fact that the far end of the prosthesis body touches the medullary cavity wall is effectively reduced.

Optionally, the surface of the prosthesis body comprises two first side surfaces which are oppositely arranged, and the bionic bulge is formed on the first side surface far away from the handle cone; an included angle exists between the planes of the two first side surfaces, and the distance between the planes of the two first side surfaces is gradually reduced along the direction from the far end to the near end of the prosthesis body.

By adopting the technical scheme, the first side face is matched with the inclination condition of the cavity wall of the medullary cavity, so that the taper fit is formed between the first side face and the cavity wall of the medullary cavity, and the postoperative stability of the prosthesis body is improved under the condition that the prosthesis body is pressed by human bones or tissues.

Optionally, the surface of the prosthesis body further includes two second side surfaces arranged oppositely, the first side surface and the second side surface are distributed adjacently, an included angle exists between planes of the two second side surfaces, and the distance between the planes of the two second side surfaces gradually decreases along the direction from the far end to the near end of the prosthesis body.

By adopting the technical scheme, the second side face is matched with the inclination condition of the cavity wall of the medullary cavity, so that the taper fit is formed between the second side face and the cavity wall of the medullary cavity, and the postoperative stability of the prosthesis body is further improved under the condition that the prosthesis body is pressed by human bones or tissues.

Optionally, an included angle exists between the two second side surfaces close to the side edges of the handle cone, and the distance between the two second side surfaces close to the side edges of the handle cone gradually decreases along the direction from close to far away from the bionic bulge.

By adopting the technical scheme, the volume of the prosthesis body is further reduced, a contact surface along the width direction of the prosthesis body exists between the second side surface and the wall of the medullary cavity, and the second side surface and the medullary cavity form taper fit along the width direction of the prosthesis body, so that the installation stability of the prosthesis body is further improved.

Optionally, the surface of the prosthesis body is coated with a coating for improving the bone ingrowth effect of the prosthesis body.

Through adopting above-mentioned technical scheme, promoted the bone on prosthesis body surface and grown into the effect, further improved the postoperative stability of prosthesis body.

In summary, the present invention has the following technical effects:

1. by arranging the bionic bulge, the prosthesis body can obtain good postoperative stability even if the length of the prosthesis body is reduced; the reduction of the length of the prosthesis body eliminates the need for a larger osteotomy volume during surgery, thereby enabling the patient to have more bone retention;

2. the anti-falling groove is formed, so that the contact area between the prosthesis body and the inner part of the medullary cavity is increased, and the prosthesis body is effectively prevented from falling out of the medullary cavity;

3. through having set up the anti-touch end, effectively reduced the distal end of prosthesis body and touched the painful possibility that the condition takes place of thigh that the pulp chamber wall leads to.

Drawings

FIG. 1 is a schematic view of the overall structure of a bionic short femoral stem prosthesis according to an embodiment of the present invention;

fig. 2 is a front view of the bionic short-type femoral stem prosthesis according to the embodiment of the present invention, wherein the corresponding state is a state when the bionic short-type femoral stem prosthesis is inserted into the femoral medullary cavity;

FIG. 3 is a side view of a biomimetic short femoral stem prosthesis in an embodiment of the present invention;

fig. 4 is a plan view of a bionic short-type femoral stem prosthesis in an embodiment of the present invention.

In the figure, 1, the prosthesis body; 11. a first side surface; 12. a second side surface; 2. a handle cone; 3. a drop-proof groove; 4. a touch prevention end; 5. bionic bulges; 6. the femur.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the utility model provides a bionic short femoral stem prosthesis, which comprises a prosthesis body 1 and a stem cone 2 formed on the proximal end of the prosthesis body 1, wherein the axis of the stem cone 2 inclines to one side of the prosthesis body 1 along the direction from the distal end to the proximal end of the prosthesis body 1 so as to install an acetabular cup; a bionic bulge 5 is arranged on one side of the near end of the prosthesis body 1, and the bionic bulge 5 is formed on the other side of the prosthesis body 1 relative to the handle cone 2; the prosthesis body 1 is provided with two oppositely arranged first side surfaces 11 and two oppositely arranged second side surfaces 12, the first side surfaces 11 and the second side surfaces 12 are distributed adjacently, the bionic bulge 5 is formed on the first side surface 11 which is deviated from the small-diameter end of the handle cone 2 and faces, and the bionic bulge 5 and the first side surfaces 11 are in smooth transition.

Referring to fig. 2, insert prosthesis body 1 inside the medullary cavity from the thighbone 6 near-end, because bionic protrusion 5's setting, can be well with the medullary cavity wall shape looks adaptation of thighbone 6 near-end, the medullary cavity wall then can be used for supporting bionic protrusion 5 in order to improve whole prosthesis body 1's stability, under the certain circumstances of the total width of guaranteeing prosthesis body 1 and bionic protrusion 5 on the human coronal axis, bionic protrusion 5's setting can be for making prosthesis body 1 short and provide the condition, even prosthesis body 1's length reduces in order to reduce patient's osteotomy volume, nevertheless because the cooperation between bionic protrusion 5 and the medullary cavity wall still can guarantee good postoperative stability.

Referring to fig. 1 and 2, in order to further improve the postoperative stability of the prosthesis body 1, a plurality of anti-slip grooves 3 are formed in the surface of the prosthesis body 1 and are uniformly distributed at intervals along the length direction of the prosthesis body 1, and the anti-slip grooves 3 are formed around the circumference of the prosthesis body 1; in addition, the surface of the prosthesis body 1 is coated with a coating capable of improving the bone ingrowth effect of the prosthesis body 1, the coating can be one or more of a titanium-based HA coating, a porous tantalum powder layer, a titanium-containing microporous layer or a hydroxyapatite surface coating, and the like, so as to achieve the effect of promoting bone ingrowth, and the materials of the first coating and the second coating are not absolutely limited; after the prosthesis body 1 is inserted into the medullary cavity, the bone marrow grows into the anti-falling groove 3, so that the stability of the position between the prosthesis body 1 and the medullary cavity is improved; due to the arrangement of the coating, the bone ingrowth effect of the prosthesis body 1 is greatly improved.

Referring to fig. 1 and 2, in the process of postoperative human body movement or the process of installing the prosthesis body 1, in order to reduce the possibility that the distal end of the prosthesis body 1 touches the wall of the medullary cavity to cause pain to the patient, a touch-preventing end 4 is formed at the distal end of the prosthesis body 1, and the axial direction of the touch-preventing end 4 is the length direction of the prosthesis body 1; the contact prevention end 4 has a taper, and the diameter of the contact prevention end 4 is gradually reduced along the direction from the approach to the far away from the handle cone 2; because the area of the large-diameter end of the anti-touch end 4 is smaller than or equal to the cross sectional area of the far end of the prosthesis body 1, the possibility of touching the wall of the medullary cavity is reduced by reducing the cross sectional area of the far end of the femoral stem prosthesis under the condition that the total length of the femoral stem prosthesis is fixed.

Referring to fig. 2 and 3, in order to further improve the shape adaptability between the prosthesis body 1 and the wall of the medullary cavity, an included angle α exists between the planes of the two first side surfaces 11, and the distance between the two planes on the human body coronal axis gradually decreases from the direction close to the pedicle cone 2, namely the proximal end of the prosthesis; similarly, an included angle beta exists between the planes of the two second side surfaces 12, and the distance between the two planes on the sagittal axis of the human body is gradually reduced along the direction from the approach to the direction far away from the handle cone 2, namely the proximal end of the prosthesis; therefore, the taper fit is formed between the prosthesis body 1 and the wall of the medullary cavity, the stability of the fit between the prosthesis body 1 and the wall of the medullary cavity is improved, and under the condition that the prosthesis body 1 is pressed by human bones or tissues, the first side surface 11 and the wall of the medullary cavity and the second side surface 12 and the wall of the medullary cavity are naturally pressed, so that the bone growing effect of the first side surface 11 and the second side surface 12 is improved.

In addition, referring to fig. 4, an included angle γ exists between the two side edges of the second side surface 12 close to the pedicle cone 2, and the distance between the two side edges gradually decreases along the direction from close to far away from the bionic bulge 5, so that the volume of the prosthesis body 1 is further reduced, a contact surface along the width direction of the prosthesis body 1 exists between the second side surface 12 and the medullary cavity wall, and further a taper fit is formed between the second side surface 12 and the medullary cavity along the width direction of the prosthesis body 1, thereby further promoting the bone ingrowth effect of the second side surface 12.

In summary, the using process of the utility model is as follows: due to the arrangement of the bionic bulge 5, the shape of the bionic bulge can be well matched with the shape of the medullary cavity wall at the proximal end of the femur 6, and the medullary cavity wall can further support the bionic bulge 5 so as to improve the stability of the whole prosthesis body 1; in addition, the anti-falling groove 3 and the coating can ensure that the surface of the prosthesis body 1 has good bone ingrowth effect so as to improve the postoperative stability of the prosthesis body 1; thus, under the condition of ensuring that the total width of the prosthesis body 1 and the bionic bulge 5 on the human body coronary axis is constant, the various arrangements of the utility model can provide conditions for shortening the prosthesis body 1, and even if the length of the prosthesis body 1 is reduced to reduce the bone cutting amount of a patient, the matching between the bionic bulge 5 and the medullary cavity wall can still ensure good postoperative stability.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a bionical short type femoral stem prosthesis, includes prosthesis body (1) and handle awl (2), its characterized in that: the handle cone (2) inclines to one side of the prosthesis body (1) along the direction from the far end to the near end of the prosthesis body (1), a bionic bulge (5) is formed on one side of the prosthesis body (1), and the bionic bulge (5) bulges in the direction departing from the handle cone (2).

2. The bionic short femoral stem prosthesis according to claim 1, wherein: the prosthesis body (1) is provided with a plurality of anti-falling grooves (3) which are arranged around the prosthesis body (1) in a circle, and the anti-falling grooves (3) are distributed at intervals between the near end and the far end of the prosthesis body (1).

3. The bionic short femoral stem prosthesis according to claim 1, wherein: the distal end of the prosthesis body (1) is formed with a tapered anti-touch end (4), and the diameter of the anti-touch end (4) is gradually reduced along the direction gradually departing from the proximal end of the prosthesis body (1).

4. The bionic short femoral stem prosthesis according to claim 1, wherein: the surface of the prosthesis body (1) comprises two first side surfaces (11) which are oppositely arranged, and the bionic bulge (5) is formed on the first side surface (11) far away from the handle cone (2); an included angle exists between the planes of the two first side surfaces (11), and the distance between the planes of the two first side surfaces (11) is gradually reduced along the direction from the far end to the near end of the prosthesis body (1).

5. The bionic short femoral stem prosthesis according to claim 4, wherein: the surface of the prosthesis body (1) further comprises two opposite second side surfaces (12), the first side surfaces (11) and the second side surfaces (12) are distributed adjacently, an included angle exists between the planes of the two second side surfaces (12), and the distance between the planes of the two second side surfaces (12) is gradually reduced along the direction from the far end to the near end of the prosthesis body (1).

6. The bionic short femoral stem prosthesis according to claim 5, wherein: an included angle is formed between the side edges of the two second side surfaces (12) close to the handle cone (2), and the distance between the side edges of the two second side surfaces (12) close to the handle cone (2) is gradually reduced along the direction from close to far away from the bionic bulge (5).

7. The bionic short femoral stem prosthesis according to claim 1, wherein: the surface of the prosthesis body (1) is coated with a coating for improving the bone ingrowth effect of the prosthesis body (1).