CN212308139U - Femoral prosthesis for retaining femoral head - Google Patents
Femoral prosthesis for retaining femoral head Download PDFInfo
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- CN212308139U CN212308139U CN202021826715.XU CN202021826715U CN212308139U CN 212308139 U CN212308139 U CN 212308139U CN 202021826715 U CN202021826715 U CN 202021826715U CN 212308139 U CN212308139 U CN 212308139U
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- intramedullary
- extramedullary
- femur
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Abstract
The utility model provides a femoral prosthesis for retaining femoral head, belonging to the technical field of medical appliance; the femoral prosthesis comprises an intramedullary solid, wherein the upper end surface of the intramedullary solid is in contact with the osteotomy surface of the proximal end of the femur, the upper end of the intramedullary solid is provided with an intramedullary solid, the intramedullary solid is inserted into the medullary cavity of the proximal end of the femur and is matched with the medullary cavity of the proximal end of the femur in shape, the outer side of the intramedullary solid is provided with a femoral outer side plate, and the femoral outer side plate is fixed on the outer side of the proximal end of the femur through a locking nail; the lower end of the extramedullary entity is connected with a broach which is fixed on the inner side of the femoral shaft cortex. According to the scheme, for the proximal femur bone defect, the femoral prosthesis can keep the femoral head and hip joint of a patient and recover the length and the function of the femur, so that the occurrence of various complications is reduced, the opportunity of one-time long-term revision is increased for the patient, and a good bone foundation is provided for the revision operation of the patient.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to a femoral prosthesis for retaining femoral head.
Background
Thighbones are the most important bones of human bodies, the thighbones are more important, and the supporting function of the thighbones is relied on for the vertical walking, the movement and the labor of people. In the face of proximal femur bone defects (excluding the condition that the femoral head and the femoral neck are also damaged) caused by tumors, comminuted fractures and the like, the total hip replacement is mostly adopted at present, the femoral head, the femoral neck and the necrotic diaphysis are cut off together and then an artificial femoral stem, an artificial acetabulum and a femoral head are implanted during hip replacement, and the method has the defects that most of the femoral head and the femoral neck which are in a perfect and healthy state are abandoned, and meanwhile, patients lose the chance of keeping the proximal femur intact in the future revision surgery.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the present invention is to provide a femoral prosthesis for retaining femoral head to solve the problem that the patient cannot keep the proximal end of the femur complete in the future when performing revision surgery because the existing total hip replacement gives up the femoral head and the femoral neck in a partial healthy state.
In order to solve the technical problem, the utility model provides a following technical scheme:
the femoral prosthesis for retaining the femoral head comprises an intramedullary solid, wherein the upper end surface of the intramedullary solid is in contact with a osteotomy surface of the proximal end of the femur, the upper end of the intramedullary solid is provided with an intramedullary solid, the intramedullary solid is inserted into a medullary cavity of the proximal end of the femur and is matched with the medullary cavity of the proximal end of the femur in shape, the outer side of the intramedullary solid is provided with a femoral outer side plate, and the femoral outer side plate is fixed on the outer side of the proximal end of the femur through a locking nail; the lower end of the extramedullary entity is connected with a broach which is fixed on the inner side of the femoral shaft cortex.
The shape of the upper end face of the extramedullary entity is matched with the shape of a osteotomy face at the proximal end of a femur, the upper end face of the extramedullary entity is provided with an extramedullary grid structure, and the surface of the intramedullary entity is provided with an intramedullary grid structure.
The outer side plate of the femur is jointed with the side surface of the proximal end of the femur, and the outer side plate of the femur is connected with the extramedullary solid body through a screw.
The femoral shaft cortex is sleeved with a fixing sleeve, the bottom of the extramedullary entity is provided with external threads, and the fixing sleeve is provided with internal threads matched with the external threads of the extramedullary entity.
Wherein, the fixed sleeve is provided with a plurality of cortical bone nail holes for fixing the cortical bone nail.
The periphery of the broach is provided with 2-4 longitudinal anti-rotation grooves, and bone cement is arranged between the broach and the femoral shaft cortex.
Wherein, the intramedullary solid is a curved columnar structure and is in conical fit with the medullary cavity at the proximal end of the femur.
Wherein the thickness of the mesh of the extramedullary mesh structure is 2-3 mm, and the aperture is 200-; the mesh thickness of the intramedullary mesh structure is 1-2 mm, and the pore diameter is 200-400 μm.
The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:
in the scheme, for the proximal femur bone defect (not including the condition that the femoral head and the femoral neck are damaged), the femoral prosthesis can keep the femoral head and the hip joint of a patient and recover the length and the function of the femur, so that the occurrence of various complications is reduced, the opportunity of one-time long-term revision is increased for the patient, and a good bone foundation is provided for the revision surgery of the patient.
Drawings
Fig. 1 is a schematic structural view of a femoral prosthesis for retaining a femoral head according to the present invention;
fig. 2 is a schematic view of the fixation sleeve of the femoral prosthesis for retaining the femoral head of the present invention.
[ reference numerals ]
1. An extramedullary entity;
11. an extramedullary lattice structure;
2. an intramedullary entity;
21. an intramedullary lattice structure;
3. a broach;
31. a rotation prevention groove;
4. locking nails;
41. locking the nail head;
5. a screw;
6. a proximal femur;
7. the femoral shaft;
71. femoral shaft cortex;
72. a femoral shaft medullary cavity;
8. a femoral outer plate;
9. fixing a sleeve;
91. cortical bone nail holes.
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. 1-2, an embodiment of the present invention provides a femoral prosthesis for retaining a femoral head, including an extramedullary entity 1, a length of the extramedullary entity 1 is determined according to a bone cutting size of a patient, thereby ensuring that a height of an affected side of the patient is consistent with a height of a healthy side, an upper end surface of the extramedullary entity 1 contacts with a bone cutting surface of a proximal femur end 6, an intramedullary entity 2 is arranged at an upper end of the extramedullary entity 1, and the intramedullary entity 2 is inserted into a medullary cavity of the proximal femur end 6 and is adapted to the shape of the medullary cavity of the proximal femur end 6, so as to satisfy individual needs of the patient.
As shown in fig. 1, the outer side of the extramedullary entity 1 is provided with a femur outer panel 8, specifically, the side of the extramedullary entity 1 is provided with 2 to 3 threaded holes, which are matched with screws 5, so as to fixedly connect the femur outer panel 8 with the extramedullary entity 1, the femur outer panel 8 is fixed at the outer side of the proximal femur end 6 through a locking nail 4, the locking nail 4 is screwed into the proximal femur end 6 of the patient, so as to fix the femur outer panel 8 at the outer side of the proximal femur end 6, thereby reducing the probability of relative rotation between the femur prosthesis and the proximal femur end 6, and being beneficial to the short-term stability of the femur prosthesis.
As shown in figure 1, the lower end of the extramedullary entity 1 is connected with a broach 3, the broach 3 is fixed at the inner side of the femoral shaft cortex 71 and is matched with the shape of the femoral shaft medullary cavity 72, and the length b and the diameter a of the broach 3 are designed according to the size of the femoral shaft medullary cavity 72 of a patient, so that the individual requirements of the patient are met. The extramedullary solid 1, the intramedullary solid 2 and the broach 3 are integrally formed by adopting an additive manufacturing technology, are solid structures made of titanium alloy materials, and ensure the mechanical strength of the prosthesis.
As shown in figure 1, the shape of the upper end surface of the intramedullary solid 1 is matched with the shape of the osteotomy surface of the proximal femur 6, so as to realize the function of mechanical bearing of the femur, the upper end surface of the intramedullary solid 1 is provided with an extramedullary lattice structure 11, and the surface of the intramedullary solid 2 is provided with an intramedullary lattice structure 21.
In this embodiment, the outer shape and size of the femoral outer plate 8 are designed according to the shape of the proximal femur end 6, and are fitted to the lateral surface of the proximal femur end 6, so as to meet the individual requirements of the patient. Have on the thighbone outer panel 8 with locking nail 4 matched with thin screw hole, guaranteed that the part of locking nail 4 non-screw in sclerotin (locking nail head 41 and thighbone outer panel 8 cooperation position promptly) can not deviate from, reduced the risk to the human body, the length of locking nail 4 can carry out corresponding selection according to the condition of patient's thighbone near-end 6.
As shown in fig. 1, a fixing sleeve 9 is sleeved on the outer side of the femoral shaft cortex 71, external threads are arranged at the bottom of the extramedullary entity 1, internal threads matched with the external threads at the bottom of the extramedullary entity 1 are arranged on the fixing sleeve 9, and the shape and size of the fixing sleeve 9 are matched with the appearance of the femoral shaft cortex 71, so that the fixing sleeve 9 is perfectly attached to the femoral shaft cortex 71, and the fixing sleeve 9 can further fix the femoral prosthesis and the femoral shaft cortex 71.
As shown in fig. 2, the fixing sleeve 9 is provided with a plurality of cortical bone nail holes 91 for fixing cortical bone nails, so as to ensure that the femoral prosthesis and the femoral shaft 7 do not rotate relatively, which is beneficial to the short-term stability of the prosthesis, and the number and the size of the nail holes 91 can be configured according to clinical requirements.
As shown in fig. 1, 2-4 longitudinal anti-rotation grooves 31 are formed on the outer periphery of the broach 3, and bone cement is arranged between the broach 3 and the femoral shaft cortex 71 for fixation, so that relative rotation between the broach 3 and the femoral shaft 7 is greatly reduced, and the femoral prosthesis is favorably stabilized.
In this embodiment, the intramedullary body 2 has a curved columnar structure, and the specific length d, diameter c and curvature are all adapted to the size of the medullary cavity of the proximal femur end 6 of the patient, so as to meet the individual requirements of the patient, and moreover, the intramedullary body 2 and the medullary cavity of the proximal femur end 6 are in conical fit, so that the connection is more stable and firm.
In the embodiment, the extramedullary grid structure 11 is a trabecular bone grid with the thickness of 2-3 mm, which is beneficial to the crawling of the proximal cortex of the femur and the long-term stability of the prosthesis, and the specific aperture is 200-; the intramedullary grid structure 21 is a trabecular bone grid with the thickness of 1-2 mm, which is beneficial to the bone ingrowth of the proximal cortex structure of the femur and the long-term stability of the prosthesis, and the specific aperture is 200-.
In the scheme, the femoral prosthesis reserves the femoral head and hip joint of a patient to the greatest extent, restores the length and the function of the femur, reduces the occurrence of various complications, increases the opportunity of one-time long-term revision for the patient and provides a good bone foundation for the revision surgery of the patient. In addition, through 3D printing technique and customized design, satisfied patient's individuation demand, through setting up thighbone outer panel and fixed cover, guaranteed thighbone false body's short-term stability, through the design of advanced 3D printing trabecula net, obtain better bone and grow into, reach better initial stage bone and grow into and the effect of well long-term stability.
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 (8)
1. A femoral prosthesis for retaining a femoral head comprises an extramedullary entity, wherein the upper end surface of the extramedullary entity is in contact with a osteotomy surface of a proximal femur, the extramedullary entity is arranged at the upper end of the extramedullary entity, the intramedullary entity is inserted into a medullary cavity of the proximal femur and is matched with the medullary cavity of the proximal femur in shape, a femoral outer side plate is arranged on the outer side of the extramedullary entity, and the femoral outer side plate is fixed on the outer side of the proximal femur through a locking nail; the lower end of the extramedullary entity is connected with a broach which is fixed on the inner side of the femoral shaft cortex.
2. The femoral prosthesis for retaining a femoral head as claimed in claim 1 wherein the intramedullary solid has an upper end surface shaped to fit the shape of the osteotomy surface of the proximal femur, the upper end surface of the intramedullary solid having an extramedullary lattice structure and the surface of the intramedullary solid having an intramedullary lattice structure.
3. The femoral prosthesis for retaining a femoral head as claimed in claim 1 wherein the lateral femoral plate is attached to the lateral surface of the proximal end of the femur, the lateral femoral plate being attached to the extramedullary body by screws.
4. The femoral prosthesis for retaining a femoral head according to claim 1, wherein the femoral shaft cortex is sleeved with a fixing sleeve, the bottom of the extramedullary body is provided with an external thread, and the fixing sleeve is provided with an internal thread matched with the external thread of the extramedullary body.
5. The femoral prosthesis for retaining a femoral head as claimed in claim 4, wherein the fixation sleeve is provided with a plurality of cortical bone screw holes for fixing cortical bone screws.
6. The femoral prosthesis for retaining a femoral head according to claim 1, wherein the outer circumference of the broach is provided with 2-4 longitudinal anti-rotation grooves, and bone cement is arranged between the broach and the femoral shaft cortex.
7. The femoral prosthesis for retaining a femoral head as claimed in claim 1 wherein the intramedullary solid is a curved columnar structure and has a tapered fit with the intramedullary canal at the proximal end of the femur.
8. The femoral prosthesis for retaining a femoral head according to claim 2, wherein the extramedullary lattice structure has a lattice thickness of 2-3 mm and a pore size of 200-400 μm; the mesh thickness of the intramedullary mesh structure is 1-2 mm, and the pore diameter is 200-400 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021826715.XU CN212308139U (en) | 2020-08-27 | 2020-08-27 | Femoral prosthesis for retaining femoral head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021826715.XU CN212308139U (en) | 2020-08-27 | 2020-08-27 | Femoral prosthesis for retaining femoral head |
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| Publication Number | Publication Date |
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| CN212308139U true CN212308139U (en) | 2021-01-08 |
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| CN202021826715.XU Active CN212308139U (en) | 2020-08-27 | 2020-08-27 | Femoral prosthesis for retaining femoral head |
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| CN (1) | CN212308139U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113974914A (en) * | 2020-08-27 | 2022-01-28 | 北京力达康科技有限公司 | Femoral prosthesis for retaining femoral head |
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2020
- 2020-08-27 CN CN202021826715.XU patent/CN212308139U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113974914A (en) * | 2020-08-27 | 2022-01-28 | 北京力达康科技有限公司 | Femoral prosthesis for retaining femoral head |
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