Shape memory alloy hip replacement proximal femoral explosion protector
By using a rupture-proof device made of shape memory alloy, which provides strong fixation through its shape memory effect, the problem of proximal femoral splitting is solved, achieving stable fixation in hip replacement surgery for elderly patients and patients with osteoporosis, and avoiding wire rupture.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- RUIJIN HOSPITAL AFFILIATED TO SHANGHAI JIAO TONG UNIV SCHOOL OF MEDICINE
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-30
AI Technical Summary
Existing femoral prostheses are prone to proximal femoral fractures during hip replacement surgery, especially in elderly patients and those with osteoporosis. Furthermore, existing wire fixation methods carry the risk of wire breakage and becoming metallic waste within the body.
The explosion-proof device, made of shape memory alloy, includes multiple clamping arms and connecting mechanisms. It provides strong fixation through the shape memory effect of thermal expansion and contraction, preventing proximal femoral fracture. The NiTi shape memory alloy expands at low temperatures and recovers its designed bending shape after heating to surround the small rotor, achieving a firm fixation.
It effectively prevents the proximal femur from splitting during hip replacement surgery, provides strong fixation, avoids wire breakage, is suitable for elderly people and patients with osteoporosis, is simple to operate, provides firm fixation, and has good biocompatibility.
Smart Images
Figure CN122297192A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical care technology, and in particular to a shape memory alloy proximal femoral rupture protector for hip replacement surgery. Background Technology
[0002] Hip replacement surgery has become a fundamental treatment for severe hip joint disorders. The majority of patients undergoing this surgery are elderly, and a large proportion of them also suffer from osteoporosis. Furthermore, most femoral prostheses currently available on the market are often not anatomically compatible with human individuals, specifically: ① when the proximal end of the prosthesis is securely locked, the distal end still has a significant gap; ② when the distal end of the prosthesis is securely locked, the proximal end is not yet firmly fixed. Therefore, during surgery, the proximal femoral cortex is prone to fracture in these patients. This is difficult to avoid not only for beginners but also for many surgeons with 20-30 years of experience. After fracture, we often use wire ligation for fixation. However, this still presents many problems: 1. Even with further fixation, the strength and confidence in early rehabilitation of patients with fractures will be significantly reduced. 2. The wires can burst after prolonged use, becoming metallic waste within the body.
[0003] The earliest known example of a circumferential clamp made of nickel-titanium shape memory alloy (NTI) appeared in patent literature (application number 94239678.2). This patent disclosed a clamp with several pairs of circumferential arms on both sides of the main body, made of NTI. The main body and arms have arc-shaped cross-sections, forming an arc larger than a semicircle. The width of the main body and the length of each arm occupy approximately one-third of the arc, and the edges of the arms have serrations convex towards the concave surface. The arc of the arms beyond the semicircle increases and bends inward. A long, narrow hole is located in the center of the main body to accommodate a suture staple. The staple, made of NTI, has straight legs and a wavy horizontal section, with an angle of less than 90 degrees between the legs and the horizontal section. In use, a clamp of appropriate size and type is first immersed in ice water to cool, and then the arms are expanded using specialized instruments. After fracture reduction, the clamp is inserted, with the clamp body positioned on the tension side. Then, a hot saline gauze compress is applied to raise the temperature. Due to the shape memory effect, the circumferential arm contracts, and the restoring force causes the serrated edge to tightly grip the proximal and distal fracture segments. Although many inventions and innovations have been made in shape memory alloy circumferential clamps since then, there are still some special application scenarios for which there has been no suitable circumferential clamp for innovation.
[0004] Therefore, in order to solve the above problems, a shape memory alloy proximal femoral rupture protector for hip replacement is proposed. Summary of the Invention
[0005] The shape memory alloy hip replacement proximal femoral explosion-proof device proposed in this invention solves the problems in the background art.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A shape memory alloy hip replacement proximal femoral explosion protector includes a fitting body. A first clamping arm is fixedly installed at the middle of the front end of the fitting body. A fourth connecting mechanism and a sixth connecting mechanism are fixedly installed at the front end of the fitting body. The fourth connecting mechanism (7) and the sixth connecting mechanism are symmetrically arranged on the upper and lower sides of the first clamping arm (2). A second connecting mechanism is fixedly installed at the middle of the rear end of the fitting body. A second clamping arm and a third clamping arm are fixedly installed at the rear end of the fitting body. The second clamping arm and the third clamping arm are symmetrically arranged on the upper and lower sides of the second connecting mechanism.
[0008] Preferably, the second connecting mechanism, the third connecting mechanism, and the fourth connecting mechanism have the same specifications.
[0009] Preferably, the second connecting mechanism includes an L-shaped connecting claw two, which is fixedly connected to the fitting body, and a limit rod two is fixedly provided at the other end of the L-shaped connecting claw two.
[0010] Preferably, an anti-slip pad is provided on the limiting rod 2 and on the side near the L-shaped connecting claw 2.
[0011] Preferably, a first connecting mechanism is fixedly provided on the right end face of the front end of the first clamping arm, and a third connecting mechanism and a fifth connecting mechanism are fixedly provided on the right end faces of the rear ends of the second clamping arm and the third clamping arm, respectively.
[0012] Preferably, the first connecting mechanism, the third connecting hook, and the fifth connecting mechanism have the same specifications.
[0013] Preferably, the first connecting mechanism includes an L-shaped connecting claw, which is fixedly connected to a first clamping arm, a second clamping arm, or a third clamping arm, and a limit rod is fixedly provided at the other end of the L-shaped connecting claw.
[0014] Preferably, an anti-slip pad is provided on the limiting rod and on the side near the L-shaped connecting claw.
[0015] The beneficial effects of this invention are:
[0016] 1. The proximal femoral rupture protector of this type of shape memory alloy hip replacement device is made of shape memory alloy material of existing technology. When the shape memory alloy body is heated and shrinks, it maintains and moves towards the shape of the proximal end of the greater trochanter of the femur to provide mechanical support for the device.
[0017] 2. This shape memory alloy hip replacement proximal femoral anti-rupture device has a second and a third clamping arm that encircles and clamps the upper and lower regions behind the lesser trochanter, and a first clamping arm that clamps the front and middle of the lesser trochanter. When the first, second, or third clamping arm clamps the femoral cortex, the first, second, or third clamping arm and its opposite second, fourth, and sixth connecting mechanisms can prevent possible splitting and provide a certain degree of relative pressure, providing a certain degree of strong fixation and avoiding proximal femoral splitting and displacement.
[0018] 3. This memory alloy hip replacement proximal femoral anti-burst device can prevent the splitting of the proximal femur in high-risk individuals undergoing hip replacement surgery. It can also directly and firmly fix the proximal femur above and below the lesser trochanter before the femoral prosthesis is ground down, thus preventing the proximal femur from splitting during the grinding process.
[0019] This invention is simple to operate, firmly fixed, practical and reliable. NiTi shape memory alloy has shape memory effect, superelasticity and good biocompatibility. The circumferential device is prepared using NiTi shape memory alloy as raw material. It is in a stretched state in the same plane at low temperature, and returns to the designed bending shape after heating to firmly and effectively circumferentially encircle the small rotor. It is mainly used in hip replacement surgery for elderly patients with femoral neck fracture and osteoporosis, and can effectively prevent proximal femoral splitting during femoral prosthesis wear. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the shape memory alloy hip replacement proximal femoral explosion-proof device proposed in this invention;
[0021] Figure 2 This is a schematic diagram of the left side structure of the shape memory alloy hip joint replacement proximal femoral explosion-proof device proposed in this invention;
[0022] Figure 3 This is a schematic diagram of the structure of the first connecting mechanism and the second connecting mechanism after being engaged in the shape memory alloy hip replacement proximal femoral explosion-proof device proposed in this invention.
[0023] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;
[0024] Figure 5 This is a diagram showing the usage status of the shape memory alloy hip replacement proximal femoral explosion-proof device proposed in this invention.
[0025] The numbers in the diagram are: 1. Fitting body, 2. First clamping arm, 3. First connecting mechanism, 4. Second connecting mechanism, 5. Second clamping arm, 6. Third connecting mechanism, 7. Fourth connecting mechanism, 8. Third clamping arm, 9. Fifth connecting mechanism, 10. Sixth connecting mechanism;
[0026] 301 L-shaped connecting claw one, 302 limiting rod one, 303 anti-slip pad one, 401 L-shaped connecting claw two, 402 limiting rod two, 403 anti-slip pad two. Detailed Implementation
[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0028] Example 1
[0029] Reference Figure 1-2 as well as Figure 5 A shape memory alloy hip replacement proximal femoral explosion-proof device includes a fitting body 1. A first clamping arm 2 is fixedly installed at the middle of the front end of the fitting body 1. A fourth connecting mechanism 7 and a sixth connecting mechanism 10 are fixedly installed at the front end of the fitting body 1, and the fourth connecting mechanism 7 and the sixth connecting mechanism 10 are symmetrically arranged on the upper and lower sides of the first clamping arm 2. A second connecting mechanism 4 is fixedly installed at the middle of the rear end of the fitting body 1. A second clamping arm 5 and a third clamping arm 8 are fixedly installed at the rear end of the fitting body 1, and the second clamping arm 5 and the third clamping arm 8 are symmetrically arranged on the upper and lower sides of the second connecting mechanism 4.
[0030] The femoral fitting part of the fitting body 1 is made of NiTi shape memory alloy material in the prior art. When the NiTi shape memory alloy body is heated and shrinks, it remains and moves towards the proximal shape of the greater trochanter of the femur to provide mechanical support for the fitting body 1.
[0031] Example 2
[0032] Reference Figure 3-5The shape memory alloy hip replacement proximal femoral anti-explosion device includes a second connecting mechanism 4, a third connecting mechanism 6, a fourth connecting mechanism 7, a first clamping arm 2, a second clamping arm 5, and a third clamping arm 8. The second connecting mechanism 4, the third connecting mechanism 6, and the fourth connecting mechanism 7 are of the same specifications. The second connecting mechanism 4 includes an L-shaped connecting claw 401, which is fixedly connected to the fitting body 1. A limit rod 402 is fixedly provided at the other end of the L-shaped connecting claw 401. An anti-slip pad 403 is provided on the limit rod 402 and on the side near the L-shaped connecting claw 401. The front end of the first clamping arm 2... A first connecting mechanism 3 is fixedly installed on the right end face of the part. A third connecting mechanism 6 and a fifth connecting mechanism 9 are fixedly installed on the right end face of the rear end of the second clamping arm 5 and the third clamping arm 8, respectively. The first connecting mechanism 3, the third connecting hook and the fifth connecting mechanism 9 have the same specifications. The first connecting mechanism 3 includes an L-shaped connecting claw 301. The L-shaped connecting claw 301 is fixedly connected to the first clamping arm 2 or the second clamping arm 5 or the third clamping arm 8. A limit rod 302 is fixedly installed at the other end of the L-shaped connecting claw 301. An anti-slip pad 303 is provided on the limit rod 302 and on the side close to the L-shaped connecting claw 301.
[0033] Working principle: The second clamping arm 5 and the third clamping arm 8 encircle and clamp the upper and lower areas behind the small rotor, while the first clamping arm 2 clamps the front and middle of the small rotor.
[0034] When the arm is wrapped, the L-shaped connecting claw 301 on the first clamping arm 2, the second clamping arm 5, or the third clamping arm 8 is engaged with its corresponding L-shaped connecting claw 401, and is locked in place by limiting the mutual movement of the limiting rod 302 and the limiting rod 402. The anti-slip pad 303 and the anti-slip pad 403 prevent the limiting rod 302 and the limiting rod 402 from sliding against each other, thereby improving stability.
[0035] When the first clamping arm 2, the second clamping arm 5, or the third clamping arm 8 is clamped on the femoral cortex, the first clamping arm 2, the second clamping arm 5, or the third clamping arm 8, as well as the second connecting mechanism 4, the fourth connecting mechanism 7, and the sixth connecting mechanism 10 opposite to them, can prevent possible splitting and provide a certain degree of relative pressure, which can provide a certain degree of strong fixation and avoid proximal femoral splitting and displacement.
[0036] During the surgery, the shape memory alloy device is placed in sterile ice-cold saline at 0-4℃ to relax it. Then it is placed in a suitable position and then irrigated with 37℃ saline to accelerate and restore the shape memory of the device, firmly and effectively holding and fixing the proximal femur and lesser trochanter. Then, the proximal femur is ground down, which can effectively prevent the proximal femur from splitting.
[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A shape memory alloy proximal femoral rupture protector for hip replacement, comprising a fitting body (1), characterized in that, A first clamping arm (2) is fixedly provided at the middle of the front end of the bonding body (1). A fourth connecting mechanism (7) and a sixth connecting mechanism (10) are fixedly provided at the front end of the bonding body (1). The fourth connecting mechanism (7) and the sixth connecting mechanism (10) are symmetrically arranged on the upper and lower sides of the first clamping arm (2). A second connecting mechanism (4) is fixedly provided at the middle of the rear end of the bonding body (1). A second clamping arm (5) and a third clamping arm (8) are fixedly provided at the rear end of the bonding body (1). The second clamping arm (5) and the third clamping arm (8) are symmetrically arranged on the upper and lower sides of the second connecting mechanism (4).
2. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 1, characterized in that, The second connecting mechanism (4), the third connecting mechanism (6) and the fourth connecting mechanism (7) have the same specifications.
3. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 2, characterized in that, The second connecting mechanism (4) includes an L-shaped connecting claw two (401), which is fixedly connected to the fitting body (1), and a limit rod two (402) is fixedly provided at the other end of the L-shaped connecting claw two (401).
4. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 3, characterized in that, An anti-slip pad (403) is provided on the limiting rod (402) and on the side near the L-shaped connecting claw (401).
5. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 1, characterized in that, The first clamping arm (2) is fixedly provided with a first connecting mechanism (3) on the right end face of its front end, and the second clamping arm (5) and the third clamping arm (8) are fixedly provided with a third connecting mechanism (6) and a fifth connecting mechanism (9) on the right end face of their rear ends, respectively.
6. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 5, characterized in that, The first connecting mechanism (3), the third connecting hook and the fifth connecting mechanism (9) have the same specifications.
7. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 6, characterized in that, The first connecting mechanism (3) includes an L-shaped connecting claw (301), which is fixedly connected to the first clamping arm (2), the second clamping arm (5), or the third clamping arm (8), and a limit rod (302) is fixedly provided at the other end of the L-shaped connecting claw (301).
8. The shape memory alloy hip replacement proximal femoral explosion-proof device according to claim 7, characterized in that, An anti-slip pad (303) is provided on the limiting rod (302) and on the side near the L-shaped connecting claw (301).