CN215307049U - Anti-falling new axis type knee joint prosthesis - Google Patents
Anti-falling new axis type knee joint prosthesis Download PDFInfo
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- CN215307049U CN215307049U CN202121170514.3U CN202121170514U CN215307049U CN 215307049 U CN215307049 U CN 215307049U CN 202121170514 U CN202121170514 U CN 202121170514U CN 215307049 U CN215307049 U CN 215307049U
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Abstract
The utility model provides an anti-falling new axis type knee joint prosthesis, which comprises: follow shin bone broach, thighbone condyle, platform pad, platform support, the shin bone broach that connects gradually down, its characterized in that: the three-way joint is composed of a transverse shaft and a longitudinal shaft with an n-shaped longitudinal section, the transverse shaft is vertically connected with the longitudinal shaft, the transverse shaft is rotatably arranged at the lower part of the femoral condyle in a penetrating way, and the longitudinal shaft penetrates through the platform pad and then is inserted into a central hole in the platform support; the bottom of one of the edges of the longitudinal shaft is provided with a barb, the left end of the barb is integrally formed with the longitudinal shaft, and the right end of the barb is bent upwards, so that the cross section of the upper part of the longitudinal shaft is smaller than that of the lower part of the longitudinal shaft. The advantages are that: the problem that the prosthesis cannot be reset due to the fact that the tee joint is separated from the central hole when the patient is too fat or the knee bending angle is too large is avoided, and therefore the safety accident is effectively avoided.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to an anti-falling new axial center type knee joint prosthesis.
Background
The knee joint of the human body has the functions of loading, load transmission and the like, is the largest and most complex joint in the human body, has the largest stability when being straightened, and has considerable flexibility when being bent so as to realize actions of walking, running, jumping and the like on uneven ground.
The common knee joint structure comprises a bone cutting section, a femoral condyle, a connecting piece, a tibial broach and the like, but the three-way joint is easy to be separated in the using process, for example, when a patient is too fat or the knee bending angle is too large, the three-way joint is separated from the original three through holes, so that the prosthesis cannot be reset, and an immeasurable safety accident is generated; or out of the way due to excessive external or internal flexion angle, etc.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel axial center type knee joint prosthesis for solving the technical defect that a tee joint is easy to separate from a platform support.
In order to realize the purpose of the utility model, the utility model provides the following technical scheme:
an anti-lux new axial center type knee joint prosthesis comprising: follow shin bone broach, thighbone condyle, platform pad, platform support, the shin bone broach that connects gradually down, its characterized in that: the three-way joint is composed of a transverse shaft and a longitudinal shaft with an n-shaped longitudinal section, the transverse shaft is vertically connected with the longitudinal shaft, the transverse shaft is rotatably arranged at the lower part of the femoral condyle in a penetrating way, and the longitudinal shaft penetrates through the platform pad and then is inserted into a central hole in the platform support;
the bottom of one of the edges of the longitudinal shaft is provided with a barb, the left end of the barb is integrally formed with the longitudinal shaft, and the right end of the barb is bent upwards, so that the cross section of the upper part of the longitudinal shaft is smaller than that of the lower part of the longitudinal shaft.
Preferably, an arc-shaped recess is formed in the lower portion of the central hole along the peripheral wall of the central hole, and the barb is opposite to the arc-shaped recess, so that the barb moves up and down in the arc-shaped recess or moves in the arc-shaped recess along the bending direction of the arc edge of the arc-shaped recess.
Preferably, a platform bushing matched with the central hole is sleeved at the upper part in the central hole, the lower end of the longitudinal shaft penetrates through the platform bushing to enter the lower part of the central hole, and a gap is reserved between the lower end face of the central hole and the lower end face of the longitudinal shaft;
wherein the bottom end of the platform liner is flush with the upper edge of the arcuate depression, the barb being located below the bottom end face of the platform liner.
Preferably, the degree of the arc-shaped edge on the arc-shaped recess is 90 °.
The utility model relates to an anti-falling new axial center type knee joint prosthesis, which has the advantages that: in the prosthesis, the specific structural design of the tee joint avoids the problem that the prosthesis cannot be reset because the tee joint is separated from the central hole when a patient is too fat or the knee bending angle is too large, so that the occurrence of safety accidents caused by the situation is effectively avoided;
the technical defect that the tee joint is separated from the platform support due to overlarge external rotation or internal rotation angle of the knee joint is overcome;
the utility model has simple structure, convenient realization and strong applicability, and better fits the primary joint effect of patients.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
FIG. 1 is a schematic cross-sectional view of a portion of an anti-slip new axial center type knee prosthesis of the present invention;
FIG. 2 is an enlarged schematic view of section II in FIG. 1;
FIG. 3 is an enlarged view of section I in FIG. 2;
FIG. 4 is a schematic view of an anti-slip new axial center type knee joint prosthesis according to the present invention;
FIG. 5 is a schematic view of the structure of FIG. 4 taken along the line A-A;
FIG. 6 is a schematic view of a portion of the platform holder;
wherein:
the osteotomy segment 1, the femoral condyle 2, the platform pad 3, the platform support 4, the central hole 41, the arc-shaped concave part 411, the platform bushing 412 and the tibial broach 5;
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In order to solve the problem that the tee joint in the knee joint prosthesis in the prior art is easy to fall off when a patient is too fat or the knee bending angle is too large, so that the prosthesis cannot be reset, the utility model introduces a new axial center type knee joint prosthesis for preventing the fall off, which mainly comprises the following components: from last to down connecting gradually cut bone segment 1, thighbone condyle 2, platform pad 3, platform support 4, shin bone broach 5, its characterized in that: the three-way joint 6 is composed of a transverse shaft 61 and a longitudinal shaft 62 with an n-shaped longitudinal section, wherein the transverse shaft 61 is vertically connected with the longitudinal shaft 62, and the transverse shaft 61 is rotatably arranged at the lower part of the femoral condyle 2 in a penetrating way; the longitudinal shaft 62 passes through the platform pad 3 and then is inserted into the central hole 41 in the platform support 4; a barb 621 is arranged at the bottom of one of the edges of the longitudinal shaft 62, the left end of the barb 621 and the longitudinal shaft 62 are integrally formed, and the right end is bent upwards, so that the cross section of the upper part of the longitudinal shaft 62 is smaller than that of the lower part of the longitudinal shaft, and when the prosthesis is implanted and in the movement process, the top of the right end of the barb 621 abuts against the central hole 41, so that the tee joint 6 is prevented from being separated from the central hole 41, and accidents are reduced;
further, the specific structures and connection relations of the tibial broach 5, the femoral condyle 2, the platform pad 3, the platform holder 4 and the tibial broach 5 are conventional, and therefore, the detailed description thereof is omitted.
In a specific embodiment, in order to avoid the situation that the tee joint 6 is pulled out of the platform support 4 when the discal leg or the leg is everted or inverted according to fig. 2, 5 and 6 after the prosthesis is implanted, the lower part in the central hole 41 is provided with an arc-shaped recess 411 along the circumferential wall thereof, and the barb 621 is opposite to the arc-shaped recess 411, so that the barb 621 moves up and down in the arc-shaped recess 411 or moves in the arc-shaped recess 411 along the bending direction of the arc edge thereof;
further, in order to meet the requirement that the prosthesis can be fitted to the original joint efficacy to the maximum extent after being implanted, as shown in fig. 5, the degree of the arc-shaped edge on the arc-shaped recess 411 is 90 ° (i.e., the degree of the arc from the point a to the point b in the figure), so as to meet the deflection range of the knee joint;
as shown in FIG. 1, the length of the arc-shaped concave part 411 in the longitudinal direction can be set according to different requirements, and is preferably 20mm, that is, the range of the tee joint 6 being pulled up when the human body does knee bending motion is 20 mm.
In a specific embodiment, in order to avoid friction and collision with the metal femoral condyle 2 and the platform support 4, as shown in fig. 1 and 2, the upper portion inside the central hole 41 is sleeved with a platform bushing 412 fitted therein, and the lower end of the longitudinal shaft 62 passes through the platform bushing 412 to enter the lower portion of the central hole 41 and has a gap with the bottom end surface of the central hole 41;
the bottom end of the platform bushing 412 is flush with the upper edge of the arc-shaped recess 411, and the barb 621 is located below the bottom end surface of the platform bushing 412, so that the barb 621 moves in the arc-shaped recess 411 to prevent the tee joint 6 from being disengaged.
In the present context, the structures or functions thereof not described in detail are all the prior art, for example, in the actual use process, the prosthesis of the present invention is further provided with a femoral broach on the upper portion of the osteotomy segment 1, and therefore, the details are not described again.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. The utility model provides an anticreep new axle center formula knee joint prosthesis, includes from last to down the osteotomy section (1), thighbone condyle (2), platform pad (3), platform support (4), shin bone broach (5) that connect gradually, its characterized in that: the three-way joint (6) is composed of a transverse shaft (61) and a longitudinal shaft (62) with an n-shaped longitudinal section, the transverse shaft (61) is vertically connected with the longitudinal shaft (62), the transverse shaft (61) is rotatably arranged at the lower part of the femoral condyle (2), and the longitudinal shaft (62) penetrates through the platform pad (3) and then is inserted into a central hole (41) in the platform support (4);
the bottom of one side of the longitudinal shaft (62) is provided with a barb (621), the left end of the barb (621) is integrally formed with the longitudinal shaft (62), and the right end is bent upwards, so that the upper cross section of the longitudinal shaft (62) is smaller than the lower cross section of the longitudinal shaft.
2. The anti-walkout new axial center type knee joint prosthesis according to claim 1, wherein: an arc-shaped concave part (411) is formed in the lower portion of the center hole (41) along the peripheral wall of the center hole, and the barb (621) is opposite to the arc-shaped concave part (411) so that the barb (621) can move up and down in the arc-shaped concave part (411) or move in the arc-shaped concave part (411) along the bending direction of the arc edge of the arc-shaped concave part.
3. The anti-walkout new axial center type knee joint prosthesis according to claim 2, wherein: a platform bushing (412) matched with the central hole (41) is sleeved at the upper part in the central hole (41), the lower end of the longitudinal shaft (62) penetrates through the platform bushing (412) to enter the lower part of the central hole (41), and a gap is reserved between the lower end surface of the central hole (41);
wherein the bottom end of the platform liner (412) is flush with the upper edge of the arcuate recess (411), the barb (621) being located below the bottom end face of the platform liner (412).
4. The anti-lux new axial center type knee joint prosthesis according to any one of claims 2 or 3, wherein: the degree of the arc edge on the arc-shaped concave part (411) is 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121170514.3U CN215307049U (en) | 2021-05-28 | 2021-05-28 | Anti-falling new axis type knee joint prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121170514.3U CN215307049U (en) | 2021-05-28 | 2021-05-28 | Anti-falling new axis type knee joint prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215307049U true CN215307049U (en) | 2021-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121170514.3U Active CN215307049U (en) | 2021-05-28 | 2021-05-28 | Anti-falling new axis type knee joint prosthesis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215307049U (en) |
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2021
- 2021-05-28 CN CN202121170514.3U patent/CN215307049U/en active Active
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