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CN-122005038-A - Reverse expansion bolt for fixing osteoporosis fracture

CN122005038ACN 122005038 ACN122005038 ACN 122005038ACN-122005038-A

Abstract

The invention discloses a reverse expansion bolt for fixing an osteoporosis fracture, which comprises an expansion sleeve, wherein an anchoring mechanism for stabilizing is arranged on the outer side of the expansion sleeve, the anchoring mechanism comprises a connecting component arranged on the outer side of the expansion sleeve, and an anti-falling component is further arranged on the outer side of the expansion sleeve; according to the invention, through the design of the wedge block which rotates outwards and is matched with an elastic expansion valve formed by an expansion joint axially arranged on an expansion sleeve, when a fixing nail is screwed, the wedge block accurately moves outwards along the inner wall of the expansion sleeve, and the expansion valve is uniformly spread by an inclined plane to realize radial controllable expansion, so that the expansion sleeve is tightly attached to a large area of a spongy bone on the inner wall of a bone hole, the bone stress is dispersed, bone cutting caused by local stress concentration is avoided, and meanwhile, a first anti-withdrawing tooth and anti-rotating tooth double anti-disengaging anti-rotating structure arranged on the outer side of the expansion sleeve effectively prevents a bolt from axially withdrawing and circumferentially rotating in the bone.

Inventors

  • CAO FAQI
  • ZHOU WU
  • Mi Bobin
  • XIA TIAN
  • LIU MENGFEI
  • LIU GUOHUI
  • Nan Hanchen

Assignees

  • 嘉一恒毅(湖北)医疗器械有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (7)

  1. 1.A reverse expansion bolt for the fixation of osteoporotic fractures, characterized in that it comprises an expansion shell (1): The outer side of the expansion sleeve (1) is provided with an anchoring mechanism (2) for stabilizing, the anchoring mechanism (2) comprises an expansion joint (23) arranged at the outer side of the expansion sleeve (1), and the outer side of the expansion sleeve (1) is also provided with an anti-falling assembly One end of the inner cavity of the expansion sleeve (1) is provided with an expansion mechanism (3) for expansion fixation, the expansion mechanism (3) comprises a moving component and a sliding component, the moving component is used for being arranged inside the expansion sleeve (1), the sliding component is connected with the moving component, and an expansion driving fixing component (4) is arranged inside the expansion sleeve (1).
  2. 2. The reverse expansion bolt for the fixation of osteoporotic fracture according to claim 1, wherein expansion joints (23) are formed on both sides of the expansion sleeve (1).
  3. 3. The reverse expansion bolt for the fixation of an osteoporotic fracture according to claim 2, wherein the anti-falling assembly comprises a first anti-falling tooth (21) fixedly arranged on the outer side of one end of the expansion sleeve (1), and an anti-rotation tooth (22) is fixedly arranged on the outer side of the other end of the expansion sleeve (1).
  4. 4. The reverse expansion bolt for the fixation of an osteoporotic fracture according to claim 1, wherein the moving assembly comprises a wedge block (31) slidably arranged at one end of the inner cavity of the expansion sleeve (1), and a threaded hole (32) is formed at one end of the wedge block (31).
  5. 5. A reverse expansion bolt for osteoporotic fracture fixation according to claim 4, wherein guide strips (33) are fixedly mounted on both sides of the wedge-shaped block (31), and the guide strips (33) slide in the expansion joints (23).
  6. 6. The reverse expansion bolt for the fixation of osteoporotic fracture according to claim 5, wherein the second anti-back teeth (34) are fixedly arranged at the top and the bottom of one end of the wedge-shaped block (31).
  7. 7. A reverse expansion bolt for osteoporotic fracture fixation according to claim 1, wherein the fixation assembly (4) comprises a screw body (41) screwed inside the expansion shell (1), one end of the screw body (41) is screwed with the wedge block (31), and the other end of the screw body (41) is fixedly provided with a nut (42).

Description

Reverse expansion bolt for fixing osteoporosis fracture Technical Field The invention relates to the technical field of medical appliances, in particular to a reverse expansion bolt for fixing an osteoporosis fracture. Background In the treatment of osteoporosis fracture, because the patient has thin bone cortex and small bone Liang Xishu, the holding force of the traditional screw (such as cortical screw and cancellous screw) is obviously reduced, the screw is easy to loosen, cut or pull out, so that internal fixation is failed, in order to enhance the fixation effect, a bone cement reinforcing screw is usually used clinically, namely bone cement is injected into a nail channel, but the method has risks of bone cement leakage, thermal injury, nondegradable and the like, an expansion screw is also used, the contact area of the screw and the bone is increased through mechanical expansion, but the existing expansion screw is made of metal materials, the elastic modulus is far higher than that of the bone, stress shielding is easy to generate, and bone injury is possibly caused due to uneven expansion, and in addition, when the steel plate is matched with the common screw for fixation, the screw loosening problem is also faced on the osteoporosis bone, so that fracture healing is influenced. Therefore, there is a need for a fixation device designed specifically for osteoporotic patients that is capable of controlled expansion at the cancellous bone site, provides sufficient and uniform holding force in the delicate bone, has a modulus of elasticity similar to that of bone to reduce stress shielding, and can be used with steel plates to achieve stable internal fixation of fractures, with easy operation, and without the need for additional steps such as bone cement. Disclosure of Invention The invention aims to provide a reverse expansion bolt for fixing an osteoporosis fracture, so as to solve the problems in the background art. In order to achieve the aim, the invention provides the following technical scheme that the reverse expansion bolt for the fixation of the osteoporosis fracture comprises an expansion sleeve: the outer side of the expansion sleeve is provided with an anchoring mechanism for stabilizing, the anchoring mechanism comprises an expansion joint arranged at the outer side of the expansion sleeve, and the outer side of the expansion sleeve is also provided with an anti-falling assembly One end of the inner cavity of the expansion sleeve is provided with an expansion mechanism for expansion fixation, the expansion mechanism comprises a moving assembly and a sliding assembly, the moving assembly is used for being arranged in the expansion sleeve, the sliding assembly is connected with the moving assembly, and an expansion driving fixing assembly is arranged in the expansion sleeve. Preferably, expansion joints are formed on two sides of the expansion sleeve. Preferably, the anti-drop assembly comprises a first anti-drop tooth fixedly arranged on the outer side of one end of the expansion sleeve, and an anti-rotation tooth is fixedly arranged on the outer side of the other end of the expansion sleeve. Preferably, the moving assembly comprises a wedge block which is slidably arranged at one end of the inner cavity of the expansion sleeve, and one end of the wedge block is provided with a threaded hole. Preferably, guide strips are fixedly arranged on two sides of the wedge-shaped block, and the guide strips are located in the expansion joints to slide. Preferably, the top and the bottom of one end of the wedge block are fixedly provided with second anti-retreating teeth. Preferably, the fixing component comprises a screw body which is in threaded connection with the inside of the expansion sleeve, one end of the screw body is in threaded connection with the wedge-shaped block, and the other end of the screw body is fixedly provided with a nut. Compared with the prior art, the invention has the beneficial effects that: According to the invention, through the design of the rotary outward-moving wedge-shaped block and the elastic expansion valve formed by the expansion joint axially arranged on the expansion sleeve, when the fixing nail is screwed, the wedge-shaped block is precisely and spirally moved outward along the inner wall of the expansion sleeve, the expansion valve is uniformly spread by an inclined plane to realize radial controllable expansion, so that the expansion sleeve is tightly attached to a large area of a spongy bone on the inner wall of a bone hole, the bone stress is dispersed, and the bone cutting caused by local stress concentration is avoided. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the writte