Implantable knee joint medial compartment pressure absorption device

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an implantable knee joint medial compartment pressure absorption device which comprises a first fixing seat, a second fixing seat and a pressure buffer column, the first fixing seat is fixed on the inner side of the lower end of a femur through a bone nail, and the second fixing seat is fixed on the inner side of the lower end of the femur through a pressure buffer column. The second fixing seat is fixed on the inner side of the upper end of the tibia through a bone nail, the pressure buffering column is connected between the first fixing seat and the second fixing seat through the telescopic rod and the connecting rod, and when a patient walks or performs other actions, the relative action between the thighbone and the tibia triggers the jacking cap to jack the pressure buffering column; the implantable knee joint inner side compartment pressure absorption device can absorb pressure borne by a knee joint inner side compartment, can be implanted into the inner side of a knee of an arthritis patient through an operation, and can absorb the pressure of the knee joint inner side compartment, so that abrasion is relieved, and joint replacement caused by arthritis is delayed.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an implantable knee joint medial compartment pressure absorbing device. Background Art

[0002] The knee joint has three compartments: the medial compartment, located between the medial condyle of the distal (lower) femur and the medial plateau of the proximal (upper) tibia; the lateral compartment, located between the lateral condyle of the distal femur and the lateral plateau of the proximal tibia; and the patellofemoral compartment, located between the patella and femur. The medial compartment of the knee bears greater load than the lateral compartment during daily activities such as walking, squatting, and standing up, resulting in greater wear and tear. With aging, wear and tear of the knee joint can lead to knee arthritis. Trauma and overexertion can also contribute to the development of knee arthritis. Due to the heavy load and wear on the medial compartment, most cases of knee arthritis occur in this compartment. Decompressing the medial compartment can alleviate knee arthritis symptoms and delay the need for joint replacement. Utility Model Content

[0003] The utility model aims to provide an implantable medial compartment pressure absorbing device for the knee joint, so as to reduce the pressure on the medial compartment of the knee joint, thereby alleviating the symptoms of knee arthritis and delaying joint replacement caused by knee arthritis.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] Provided is an implantable medial compartment pressure absorption device for the knee joint, comprising a first fixing seat for mounting on the medial condyle of the distal femur and a second fixing seat for mounting on the medial condyle of the proximal tibia, the first fixing seat being provided with a first screw hole for mounting a bone screw, and the second fixing seat being provided with a second screw hole for mounting a bone screw; a pressure buffer column being provided between the first and second fixing seats, a telescopic rod being provided on the upper portion of the pressure buffer column, a guide structure being provided in the pressure buffer column for guiding the telescopic rod to move up and down, the upper portion of the telescopic rod passing through the pressure buffer column, and a top pressure cap being provided on the upper portion of the telescopic rod, a first ball head being provided on the top of the telescopic rod, a connecting rod being provided on the bottom of the pressure buffer column, a second ball head being provided on the bottom of the connecting rod, a first ball head groove being provided in the first and second fixing seats, respectively, the first ball head and the second ball head being located in the first and second ball head grooves, respectively, and when the telescopic rod moves up and down, causing the top pressure cap to press on the pressure buffer column, the pressure buffer column can absorb energy and buffer pressure.

[0006] Preferably, the pressure buffer column includes a rigid section and a buffer section, the lower end of the buffer section is butted against the upper end of the rigid section, and the buffer section can absorb energy and buffer pressure.

[0007] Preferably, the upper end of the rigid segment is provided with a docking interface for connecting the buffer segment, and a plurality of filling holes are provided on the peripheral wall of the docking interface. The lower end of the buffer segment is welded and docked in the docking interface of the rigid segment, and the filling holes are filled with the material of the buffer segment after hot melting.

[0008] Preferably, the buffer segment is made of polycarbonate or urethane.

[0009] Preferably, the first fixing seat and the second fixing seat are made of titanium alloy; the rigid section, telescopic rod and connecting rod are made of titanium alloy or stainless steel.

[0010] Preferably, the guide structure is a telescopic guide sleeve arranged in the rigid section, and the bottom of the telescopic rod is arranged in the telescopic guide sleeve.

[0011] Preferably, the rigid section is hollow, the connecting rod is fixed to the rigid section as a whole, the connecting rod passes through the bottom of the rigid section, the telescopic guide sleeve is arranged on the top of the connecting rod; and an anti-slip structure is provided on the telescopic rod.

[0012] Preferably, the first fixing seat is provided with a first pin hole, and the second fixing seat is provided with a second pin hole.

[0013] Preferably, the upper surfaces of the first fixing seat and the second fixing seat are both smooth surfaces.

[0014] Preferably, the first fixing seat includes a first main body, the first ball head groove is arranged in the first main body, three first extension legs are provided on the side of the first main body, and each of the first extension legs is provided with a first screw hole; the second fixing seat includes a second main body, the second ball head groove is arranged in the second main body, three second extension legs are provided on the side of the second main body, and each of the second extension legs is provided with a second screw hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the first fixing seat of the implantable medial compartment pressure absorbing device of the knee joint is fixed to the inner side of the lower end of the femur by a bone screw, the second fixing seat is fixed to the inner side of the upper end of the tibia by a bone screw, and the pressure buffer column is connected between the first fixing seat and the second fixing seat by a telescopic rod and a connecting rod. When the patient walks or performs other movements, the relative movement between the femur and the tibia will trigger the top pressure cap to press on the pressure buffer column, absorbing the pressure on the medial compartment of the knee joint. The implantable medial compartment pressure absorbing device of the knee joint can be surgically implanted into the inner side of the knee of an arthritis patient. The implantable medial compartment pressure absorbing device of the knee joint can absorb the pressure of the medial compartment of the knee, thereby slowing down wear and delaying joint replacement caused by arthritis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the implantable knee joint medial compartment pressure absorbing device of the present invention.

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the first fixing seat in one embodiment of the implantable knee joint medial compartment pressure absorbing device of the present invention.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the second fixing seat in one embodiment of the implantable knee joint medial compartment pressure absorbing device of the present invention.

[0020] Figure 4 This is a schematic structural diagram of the pressure buffer column, telescopic rod and connecting rod in one embodiment of the implantable knee joint medial compartment pressure absorbing device of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal structure of the rigid section of the pressure buffer column in one embodiment of the implantable medial compartment pressure absorbing device of the knee joint of the present invention.

[0022] Figure 6 This is a schematic diagram of the internal installation structure of the pressure buffer column, telescopic rod and connecting rod in one embodiment of the implantable knee joint medial compartment pressure absorption device of the present invention.

[0023] Figure 7 This is a structural schematic diagram of an embodiment of the implantable knee joint medial compartment pressure absorbing device of the present invention when the telescopic rod moves downward so that the pressure cap presses on the pressure buffer column.

[0024] In the figure, the numbers are indicated as: first fixed seat 1, first screw hole 11, first ball head groove 12, first pin hole 13, first main body 14, first extension leg 15, second fixed seat 2, second screw hole 21, second ball head groove 22, second pin hole 23, second main body 24, second extension leg 25, pressure buffer column 3, telescopic rod 31, top pressure cap 32, first ball head 33, connecting rod 34, second ball head 35, rigid section 36, docking port 361, filling hole 362, buffer section 37, telescopic guide sleeve 38. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In one embodiment, an implantable knee joint medial compartment pressure absorbing device is provided, such as Figure 1-4 As shown, the implantable knee joint medial compartment pressure absorption device includes a first fixing seat 1 for installation on the medial condyle of the distal femur, and a second fixing seat 2 for installation on the medial condyle of the proximal tibia. The medial condyle of the distal femur refers to the medial condyle of the lower end of the femur, and the medial condyle of the proximal tibia refers to the medial condyle of the upper end of the tibia. The first fixing seat 1 is provided with a first screw hole 11 for installing a bone screw, and the second fixing seat 2 is provided with a second screw hole 21 for installing a bone screw, so that the first fixing seat 1 and the second fixing seat 2 are fixed to the corresponding parts of the leg bones through the bone screws. A pressure buffer column 3 is provided between the first fixing seat 1 and the second fixing seat 2. Here, the pressure buffer column 3 refers to a pressure buffer column 3 that is subjected to pressure in the length direction ( Figure 4 The pressure buffer column 3 may be made of a polymer material with elasticity or a composite of a polymer material and a metal material.

[0027] A telescopic rod 31 is provided on the upper part of the pressure buffer column 3, and the telescopic rod 31 is inserted into the pressure buffer column 3. A hole is provided on the top of the pressure buffer column 3 for the telescopic rod 31 to move up and down. The upper part of the telescopic rod 31 passes through the pressure buffer column 3. The telescopic rod 31 can move up and down in the pressure buffer column 3 to achieve telescoping. A guide structure for guiding the telescopic rod 31 to move up and down is provided in the pressure buffer column 3. The guide structure can be a slide structure that guides a piston or a slider of other shapes, or a slide structure that directly matches the lower end of the telescopic rod.

[0028] A top pressure cap 32 is provided on the upper part of the telescopic rod 31. The top pressure cap 32 is a conical structure and can also be a flat structure. The top pressure cap 32 is integrally arranged on the telescopic rod 31. When the telescopic rod 31 moves downward, the top pressure cap 32 will press on the top of the pressure buffer column 3 to achieve pressure transfer. The pressure buffer column 3 can buffer the pressure applied by the top pressure cap 32. When the telescopic rod 31 moves upward, the top pressure cap 32 detaches from the top of the pressure buffer column 3, and the pressure buffer column 3 recovers.

[0029] A first ball head 33 is provided at the top of the telescopic rod 31, and a connecting rod 34 is provided at the bottom of the pressure buffer column 3. The connecting rod 34 is fixed to the bottom of the pressure buffer column 3, and a second ball head 35 is provided at the bottom of the connecting rod 34. A first ball head groove 12 and a second ball head groove 22 are respectively provided in the first fixed seat 1 and the second fixed seat 2. The first ball head 33 and the second ball head 35 are respectively located in the first ball head groove 12 and the second ball head groove 22. The first ball head 33 and the second ball head 35 can be rotated to different directions in the first ball head groove 12 and the second ball head groove 22, respectively, so that the posture of the pressure buffer column 3 can adapt to the movement of the medial bone structure of the knee to achieve buffering.

[0030] Based on the above embodiments, it can be known that the first fixing seat 1 of the implantable medial compartment pressure absorbing device of the knee joint is fixed to the inner side of the lower end of the femur by bone screws, the second fixing seat 2 is fixed to the inner side of the upper end of the tibia by bone screws, and the pressure buffer column 3 is connected between the first fixing seat 1 and the second fixing seat 2 by a telescopic rod 31 and a connecting rod 34. When the patient walks or performs other movements, the relative movement between the femur and the tibia will trigger the top pressure cap 32 to press on the pressure buffer column 3, absorbing the pressure on the medial compartment of the knee joint. The implantable medial compartment pressure absorbing device of the knee joint can be surgically implanted into the inner side of the knee of an arthritis patient. The implantable medial compartment pressure absorbing device of the knee joint can absorb the pressure of the medial compartment of the knee, thereby slowing down wear and delaying joint replacement caused by arthritis.

[0031] Furthermore, in another embodiment, Figure 4-7 As shown, the pressure buffer column 3 of the implantable knee joint medial compartment pressure absorbing device includes a rigid section 36 and a buffer section 37. The lower end of the buffer section 37 is docked with the upper end of the rigid section 36. The buffer section 37 is a hollow structure with a hole at the top for the telescopic rod 31 to enter and exit. The buffer section 37 can deform to absorb energy and buffer pressure under pressure, while the rigid section 36 cannot absorb energy by deformation. The buffer section 37 can absorb energy by deformation and can restore its shape after the pressure is released.

[0032] Combine Figure 1-7As shown, in one embodiment, the buffer segment 37 is made of polycarbonate, the first fixing seat 1 and the second fixing seat 2 are made of titanium alloy, and the rigid segment 36, telescopic rod 31, and connecting rod 34 of the pressure buffer column 3 are made of titanium alloy. Both polycarbonate and titanium alloy are medical materials with good human acceptance. In other embodiments, the buffer segment may also be made of urethane (ethyl carbamate) or other polymer materials, and the rigid segment, telescopic rod, and connecting rod may also be made of stainless steel.

[0033] Furthermore, in another embodiment, Figure 4-7 As shown, the upper end of the rigid section 36 of the implantable medial compartment pressure-absorbing device for the knee joint is provided with a docking port 361 for connecting to the buffer section 37. A plurality of filling holes 362 are provided on the peripheral wall of the docking port 361. The lower end of the buffer section 37 is welded and docked into the docking port 361 of the rigid section 36, and the filling holes 362 are filled with the heat-melted material of the buffer section. The buffer section 37 is made of a polymer material. The lower end of the polymer material is heat-melted and inserted into the docking port 361 at the upper end of the rigid section 36. The heat-melted polymer material is then squeezed into the filling holes 362, and after cooling and solidification, a stable connection structure is formed.

[0034] Furthermore, in another embodiment, Figure 4-7 As shown, the guide structure of the implantable knee joint medial compartment pressure absorbing device arranged in the pressure buffer column 3 is a telescopic guide sleeve 38 arranged in the rigid section 36. The internal slide of the telescopic guide sleeve 38 matches the lower part of the telescopic rod 31. The bottom of the telescopic rod 31 is arranged in the telescopic guide sleeve 38. During the up and down movement of the telescopic rod 31, its bottom is guided by the telescopic guide sleeve 38, so that the moving direction of the telescopic rod remains axial, so that the top pressure cap 32 can be pressed on the pressure buffer column 3.

[0035] Furthermore, in another embodiment, Figure 4-7 As shown, the rigid section 36 of the implantable knee joint medial compartment pressure absorbing device is a hollow structure. The connecting rod 34 is fixed to the rigid section 36 as an integral unit. The connecting rod 34 passes through the bottom of the rigid section 36. The telescopic guide sleeve 38 is integrally provided at the top of the connecting rod 34. In other embodiments, the telescopic guide sleeve 38 can also be directly formed into one piece with the rigid section 36. An anti-slip structure is also provided on the telescopic rod 31. The anti-slip structure is intended to prevent the telescopic rod 31 from detaching from other components. In this embodiment, the anti-slip structure is an expanded diameter section 39 provided on the telescopic rod 31. In other embodiments, the anti-slip structure can also be other structures. For example, an expanded diameter section located in the telescopic guide sleeve is provided at the bottom of the telescopic rod, and an inner flange is provided at the top of the telescopic guide sleeve. The inner flange prevents the bottom expanded diameter section from detaching from the telescopic guide sleeve. This structure can also play a role in preventing detachment.

[0036] Furthermore, in another embodiment, Figure 1-3 As shown, the medial compartment pressure absorbing device of the knee joint is provided with a first pin hole 13 on the first fixing seat 1, and a second pin hole 23 on the second fixing seat 2. There are two first pin holes 13 and two second pin holes 23, which are used to position the first fixing seat 1 and the second fixing seat 2 on the femur and tibia by pins during surgery.

[0037] Furthermore, in another embodiment, Figure 1-3 As shown, the upper surfaces of the first fixing seat 1 and the second fixing seat 2 of the implantable knee joint medial compartment pressure absorbing device are both smooth surfaces. Figure 2 and Figure 3 The dotted lines in the figure are the curvatures of the surfaces of the first fixing seat 1 and the second fixing seat 2. The bottom surfaces of the first fixing seat 1 and the second fixing seat 2 match the inner side of the lower end of the femur and the inner side of the upper end of the tibia.

[0038] Furthermore, in another embodiment, Figure 1-3 As shown, the first fixing seat 1 of the implantable medial compartment pressure-absorbing device for the knee joint includes a first main body 14, a first ball head slot 12 disposed within the first main body 14, and first extension legs 15 disposed on the left and right sides and rear sides of the first main body 14. Each of the three first extension legs 15 is provided with a first screw hole 11. The second fixing seat 2 includes a second main body 24, a second ball head slot 22 disposed within the second main body 24, and three second extension legs 25 disposed on the sides of the second main body 24. Two of the second extension legs 25 extend forward on the left and right sides of the second main body 24, and another second extension leg 25 extends toward the right rear side of the second main body 24. Each of the three second extension legs 25 is provided with a second screw hole 21. The first and second screw holes 11, 21 can be internally threaded as needed.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An implantable knee joint medial compartment pressure absorbing device, characterized by: The support frame includes a first fixing seat for being mounted on the medial condyle of the distal femur and a second fixing seat for being mounted on the medial condyle of the proximal tibia, the first fixing seat being provided with a first screw hole for installing a bone screw, and the second fixing seat being provided with a second screw hole for installing the bone screw; a pressure buffer column is provided between the first fixing seat and the second fixing seat, a telescopic rod is provided on the upper portion of the pressure buffer column, a guide structure for guiding the telescopic rod to move up and down is provided in the pressure buffer column, the upper portion of the telescopic rod passes through the pressure buffer column, and a top pressure cap is provided on the upper portion of the telescopic rod, a first ball head is provided on the top of the telescopic rod, a connecting rod is provided at the bottom of the pressure buffer column, and a second ball head is provided at the bottom of the connecting rod, a first ball head groove and a second ball head groove are respectively provided in the first fixing seat and the second fixing seat, the first ball head and the second ball head are respectively located in the first ball head groove and the second ball head groove, when the telescopic rod moves up and down, the top pressure cap presses on the pressure buffer column, and the pressure buffer column can absorb energy and buffer pressure.

2. The implantable knee joint medial compartment pressure absorbing device according to claim 1, characterized in that: The pressure buffer column includes a rigid section and a buffer section, the lower end of the buffer section is butted against the upper end of the rigid section, and the buffer section can absorb energy and buffer pressure.

3. The implantable knee joint medial compartment pressure absorbing device according to claim 2, characterized in that: The upper end of the rigid section is provided with a docking interface for connecting the buffer section, and a plurality of filling holes are provided on the peripheral wall of the docking interface. The lower end of the buffer section is welded and docked in the docking interface of the rigid section, and the filling holes are filled with the material of the buffer section after hot melting.

4. The implantable knee joint medial compartment pressure absorbing device according to claim 2, characterized in that: The buffer section is made of polycarbonate or urethane.

5. The implantable knee joint medial compartment pressure absorbing device according to claim 2, characterized in that: The first fixing seat and the second fixing seat are made of titanium alloy; the rigid section, telescopic rod and connecting rod are made of titanium alloy or stainless steel.

6. The implantable knee joint medial compartment pressure absorbing device according to claim 2, characterized in that: The guide structure is a telescopic guide sleeve arranged in the rigid section, and the bottom of the telescopic rod is arranged in the telescopic guide sleeve.

7. The implantable knee joint medial compartment pressure absorbing device according to claim 6, characterized in that: The rigid section is hollow, the connecting rod is fixed to the rigid section as a whole, the connecting rod passes through the bottom of the rigid section, the telescopic guide sleeve is arranged on the top of the connecting rod; and an anti-slip structure is provided on the telescopic rod.

8. The implantable knee joint medial compartment pressure absorbing device according to claim 1, characterized in that: The first fixing seat is provided with a first pin hole, and the second fixing seat is provided with a second pin hole.

9. The implantable knee joint medial compartment pressure absorbing device according to claim 1, characterized in that: The upper surfaces of the first fixing seat and the second fixing seat are both smooth surfaces.

10. The implantable knee joint medial compartment pressure absorbing device according to claim 1, characterized in that: The first fixing seat includes a first main body, the first ball head groove is arranged in the first main body, three first extension legs are provided on the side of the first main body, and each of the first extension legs is provided with a first screw hole; the second fixing seat includes a second main body, the second ball head groove is arranged in the second main body, three second extension legs are provided on the side of the second main body, and each of the second extension legs is provided with a second screw hole.

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