CN212308140U

CN212308140U - Tibia prosthesis

Info

Publication number: CN212308140U
Application number: CN202021841098.0U
Authority: CN
Inventors: 毕文志
Original assignee: Chinese PLA General Hospital
Current assignee: Chinese PLA General Hospital
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-01-08
Anticipated expiration: 2030-08-28

Abstract

The utility model provides a tibia prosthesis, belonging to the technical field of medical appliances; the tibial prosthesis comprises a tibial platform support, wherein a first intramedullary solid is arranged on the upper end surface of the tibial platform support, and intramedullary grids are arranged on the surface of the first intramedullary solid; a support rod is arranged on the lower end face of the tibial platform support, the end part of the support rod is connected with one end of the tibial section, a second intramedullary solid is arranged at the other end of the tibial section, and a bone cement groove is formed in the second intramedullary solid; and an extramedullary grid is arranged on the end surface of the tibial plateau support. According to the scheme, the tibial prosthesis restores the length and the function of the tibia, simultaneously keeps the integrity of a tibial platform and a knee joint of a patient, increases the opportunity of one-time long-term revision for the patient, provides a good bone foundation for the next revision surgery of the patient in the future, and can obtain better bone ingrowth by arranging the intramedullary grids and the extramedullary grids.

Description

Tibia prosthesis

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a tibia prosthesis.

Background

The tibia is an important skeleton of a human body, the tibia platform is more important, and the bending, walking, moving and working of the human body are completed by the knee joint formed by the tibia platform. In the face of proximal tibial bone defects (excluding the situation that a tibial plateau is damaged) caused by tumors, comminuted fractures and the like, knee joint replacement is mostly adopted at present, a knee joint (including a femoral condyle and the tibial plateau) and a necrotic tibial diaphysis are cut together when the knee joint replacement is carried out, and then an artificial knee joint prosthesis is implanted.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a tibial component to solve and adopt knee replacement art treatment tibial bone defect at present (not including the circumstances that the tibial plateau also faces the damage), do not keep the knee joint that the patient is in health condition (containing thighbone condyle, tibial plateau), lead to the patient to lose the chance that keeps the shin bone near-end complete when doing the revision operation in the future, and the unstable problem of postoperative patient knee joint.

In order to solve the technical problem, the utility model provides a following technical scheme:

a tibial prosthesis comprises a tibial plateau support, wherein a first intramedullary solid is arranged on the upper end face of the tibial plateau support, and an intramedullary grid is arranged on the surface of the first intramedullary solid; a support rod is arranged on the lower end face of the tibial platform support, the end part of the support rod is connected with one end of the tibial section, a second intramedullary solid is arranged at the other end of the tibial section, and a bone cement groove is formed in the second intramedullary solid; and an extramedullary grid is arranged on the end surface of the tibial plateau support.

The end face of the tibia section is provided with a mounting groove, and the end portion of the supporting rod is inserted into the mounting groove.

The end of the supporting rod is provided with an external thread, and the mounting groove is provided with an internal thread matched with the external thread.

The side face of the tibia section is provided with a locking steel plate, and the locking steel plate is provided with a locking screw used for being connected with the tibia far end.

Wherein the locking steel plate is connected with the tibial section through a screw.

The side of shin bone section vertically the equipartition have a plurality ofly with the screw hole of screw looks adaptation, the equipartition has a plurality ofly to be used for on the locking steel sheet the through-hole that the screw passed, just the spacing distance between the through-hole with the spacing distance between the screw hole is unanimous.

The tibia platform support is provided with a threaded through hole, and a locking screw used for being connected with the proximal tibia end is arranged in the threaded through hole.

Wherein, the cover is equipped with the extension ring on the bracing piece, the week side of extension ring is equipped with extension ring grid, extension ring grid is imitative bone trabecula porous structure.

Wherein, the intramedullary grid and the extramedullary grid are both bone-like trabecula porous structures.

Wherein, the surface of tibial plateau holds in the palm is provided with a plurality of suture holes.

The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:

in the scheme, the tibial prosthesis maintains the integrity of a tibial platform and a knee joint of a patient while restoring the length and the function of a tibia, increases the opportunity of one-time long-term revision for the patient, provides a good bone foundation for the next revision surgery faced by the patient in the future, and can obtain better bone ingrowth by arranging the intramedullary grids and the extramedullary grids.

Drawings

Fig. 1 is a schematic structural view of the tibial prosthesis of the present invention.

[ reference numerals ]

1. A tibial plateau tray; 11. an extramedullary mesh; 12. a suture hole; 13. a threaded through hole;

2. a first intramedullary entity; 21. an intramedullary lattice;

3. a support bar; 31. external thread

4. A tibial segment; 41. mounting grooves; 42. a threaded hole;

5. a second intramedullary entity;

6. an extension ring; 61. extending the ring grid;

7. a proximal tibia end;

8. bone grafting sections;

9. a distal tibia end;

10. and locking the steel plate.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an embodiment of the present invention provides a tibial prosthesis, including a tibial platform support 1, wherein an end face shape of the tibial platform support 1 is adapted to a cut bone end face shape of a proximal tibia end, an upper end face of the tibial platform support 1 is provided with a first columnar intramedullary solid 2, the first intramedullary solid 2 is inserted into a proximal tibia end 7 of a patient, a lower end face of the tibial platform support 1 is provided with a support rod 3, a bottom end of the support rod 3 is connected to an upper end of a tibial section 4, a lower end of the tibial section 4 is provided with a second intramedullary solid 5, the second intramedullary solid 5 is inserted into a medullary cavity of a distal tibia end 9 of the patient, the shape of the second intramedullary solid is adapted to the medullary cavity of the distal tibia end 9, the second intramedullary solid 5 is provided with 2 to 4 bone cement grooves, the second intramedullary solid is inserted into the medullary cavity of the distal tibia end 9 after being coated with bone cement, the tibial prosthesis is firmly fixed, and the tibial prosthesis can be, the early stage stability of the prosthesis is ensured.

In this embodiment, the tibial plateau holder 1, the first intramedullary solid 2 and the support rod 3 are an integrated solid structure made of titanium alloy material, so as to ensure the mechanical strength of the prosthesis. The length of the supporting rod 3 is determined according to the osteotomy size of the patient, so that the height of the affected side of the patient is ensured to be consistent with that of the healthy side. The surface of the support rod 3 is provided with a hydroxyapatite coating which is beneficial to the attachment and the growth of the bone grafting section 8 and the long-term stability of the prosthesis.

As shown in fig. 1, an intramedullary grid 21 is arranged on the surface of the first intramedullary solid 2, and the intramedullary grid 21 is a 3D printed bone trabecula-like porous structure with a thickness of 1mm-3mm, so as to facilitate bone ingrowth of proximal cancellous bone of tibia. The end face of the tibial platform support 1 is provided with an extramedullary grid 11, the extramedullary grid 11 is of a 3D printing bone trabecula simulating porous structure, and the thickness is 2mm-4 mm. The extramedullary grid 11 on the upper end surface of the tibial plateau support 1 is beneficial to bone ingrowth and bone crawling of the proximal cortex of the tibia, and the extramedullary grid 11 on the lower end surface is beneficial to bone ingrowth and bone crawling of the bone grafting section 8.

As shown in fig. 1, the upper end surface of the tibia section 4 is provided with an installation groove 41, and the bottom end portion of the support rod 3 is inserted into the installation groove 41. Wherein, the bottom end of bracing piece 3 is equipped with external screw thread 31, mounting groove 41 is equipped with the internal thread of external screw thread 31 looks adaptation.

In this embodiment, the length of the tibia section 4 is determined according to the osteotomy size of the patient, so that the length of the affected side of the patient is ensured to be consistent with that of the healthy side, the tibia section 4 and the second intramedullary solid 5 are of an integrated structure formed by machining, the material is forged titanium alloy, and the mechanical strength of the prosthesis is ensured.

As shown in fig. 1, a locking steel plate 10 is provided on the lateral surface of the tibia segment 4, and a locking screw for connecting with the tibia distal end 9 is provided on the locking steel plate 10.

Wherein the locking steel plate 10 is connected with the tibial segment 4 by screws. The side of shin bone section 4 vertically the equipartition have a plurality ofly with screw hole 42 of screw looks adaptation, the equipartition has a plurality ofly to be used for on the locking steel sheet 10 the through-hole that the screw passed, just the spacing distance between the through-hole with the spacing distance between the screw hole 42 is unanimous.

In this embodiment, the shape of the locking steel plate 10 is matched with the shape of the tibia far end 9, one end of the locking steel plate 10 is fixed to the tibia section 2 through a screw, and the other end of the locking steel plate is fixed to the tibia far end 9 through a locking screw, so that the tibia section 2 is fixedly connected with the tibia far end 9, and therefore the early-stage stability of the prosthesis is guaranteed.

As shown in fig. 1, a threaded through hole 13 is formed in the tibial plateau support 1, a locking screw used for being connected with the proximal tibia end 7 is arranged in the threaded through hole 13, a counter bore matched with a screw cap of the locking screw is formed in the threaded through hole 13, the counter bore is in threaded connection with the screw cap of the locking screw, the locking screw can be prevented from being disengaged, and the risk to a human body is reduced.

In this embodiment, the cover is equipped with bone grafting section 8 on the bracing piece 3 and with the extension ring 6 of bone grafting section 8 looks adaptation uses the extension ring of different specifications through the cooperation, can adjust osteotomy length in a flexible way in the art, can the perfect adaptation patient suffer from the limb. Extension ring 6 is titanium alloy material, adopts 3D printing technique integrated into one piece, the week side of extension ring 6 is equipped with extension ring net 61, the thickness of extension ring net 61 is 2mm-5mm, for imitative bone trabecula porous structure, does benefit to the bone length of bone grafting section 8 and goes into and the bone crawls, does benefit to the long-term stability of prosthesis.

As shown in fig. 1, a plurality of suture holes 12 are formed in the surface of the tibial plateau tray 1, so that the suture is conveniently used for fixing soft tissues such as muscles and ligaments in the operation, the joint is stabilized, and the prosthesis is stabilized in the early stage. The diameter of the suture hole 12 is 2.5mm-4mm, which is determined according to the diameter of a curved needle used in an operation, and the radian of the suture hole 12 is a circle with the diameter of 25mm-40mm, which is determined according to the radian of the curved needle used in the operation.

In the scheme, the tibial prosthesis maintains the integrity of a tibial platform and a knee joint of a patient while restoring the length and the function of a tibia, increases the opportunity of one-time long-term revision and provides a good bone foundation for the next revision surgery of the patient in the future; the tibia prosthesis is matched with extension rings with different specifications, so that the osteotomy length can be flexibly adjusted in the operation, and the tibia prosthesis can be perfectly matched with the affected limb of a patient; the tibia platform support and the extension ring of the tibia prosthesis are manufactured based on a 3D printing technology, a bone grafting space is formed between the tibia platform support and the extension ring, a good environment is provided for bone growth by 3D printing of a bone-like trabecular porous structure, and the prosthesis is more stable and firm due to a multi-element reconstruction mode of the prosthesis and a bone grafting section; the tibia prosthesis adopts multiple fixation, and long-term stability of the prosthesis is guaranteed.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A tibial prosthesis comprises a tibial plateau support, and is characterized in that a first intramedullary solid is arranged on the upper end surface of the tibial plateau support, and intramedullary grids are arranged on the surface of the first intramedullary solid;

a support rod is arranged on the lower end face of the tibial platform support, the end part of the support rod is connected with one end of the tibial section, a second intramedullary solid is arranged at the other end of the tibial section, and a bone cement groove is formed in the second intramedullary solid;

and an extramedullary grid is arranged on the end surface of the tibial plateau support.

2. The tibial prosthesis of claim 1, wherein an installation groove is provided on an end surface of said tibial segment, and an end portion of said strut is inserted in said installation groove.

3. The tibial prosthesis of claim 2, wherein said end of said strut is provided with an external thread and said mounting slot is provided with an internal thread adapted to said external thread.

4. The tibial prosthesis of claim 1, wherein a locking steel plate is provided on a side of said tibial segment, and a locking screw for connection to a distal end of the tibia is provided on said locking steel plate.

5. The tibial prosthesis of claim 4, wherein said locking steel plate is connected to said tibial segment by a screw.

6. The tibial prosthesis of claim 5, wherein the lateral surface of the tibial segment is longitudinally and uniformly provided with a plurality of threaded holes adapted to the screws, the locking steel plate is uniformly provided with a plurality of through holes for the screws to pass through, and the spacing distance between the through holes is consistent with the spacing distance between the threaded holes.

7. The tibial prosthesis of claim 1, wherein said tibial plateau tray has a threaded through-hole therein, said threaded through-hole having a locking screw therein for connection to a proximal end of a tibia.

8. The tibial prosthesis of claim 1, wherein the supporting rod is sleeved with an extension ring, and an extension ring grid is arranged on the periphery of the extension ring and is of a bone trabecular-like porous structure.

9. The tibial prosthesis of claim 1, wherein said intramedullary lattice and said extramedullary lattice are both trabecular bone-like porous structures.

10. The tibial prosthesis of claim 1, wherein a surface of said tibial plateau tray is provided with a plurality of suture holes.