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CN-121987313-A - Micro-motion intramedullary nail

CN121987313ACN 121987313 ACN121987313 ACN 121987313ACN-121987313-A

Abstract

The invention discloses a micro-motion intramedullary nail, which relates to the field of medical appliances and comprises an intramedullary nail main body, wherein the intramedullary nail main body consists of a far-end nail body and a near-end nail body, the far-end nail body is provided with a far-end interlocking screw hole, the near-end nail body is provided with a near-end interlocking screw hole, a micro-motion assembly is arranged between the far-end nail body and the near-end nail body, the micro-motion assembly comprises an absorbable block and a limiting nail body, and the outer wall of the intramedullary nail main body is provided with a femtosecond laser modified coating for promoting fracture healing. According to the micro-motion intramedullary nail, the problem of stress shielding caused by mismatching of elastic modulus of the existing intramedullary nail and bone tissue is effectively solved by arranging the micro-motion assembly, moderate micro-motion space is provided during fracture healing, excessive bearing stress of the intramedullary nail is avoided, the risk of bone mass loss and osteoporosis is reduced, the probability of secondary fracture is reduced, the fracture healing period is shortened, and meanwhile, the absorbable block is not required to be taken out through secondary operation, so that pain and medical burden of a patient are relieved.

Inventors

  • CHEN WEI
  • WANG JUAN
  • ZHANG LICHENG
  • LV HOUCHEN
  • Tang Jiutian
  • ZHANG YASONG
  • YANG PUXIN

Assignees

  • 河北医科大学第三医院
  • 中国人民解放军总医院第四医学中心

Dates

Publication Date
20260508
Application Date
20260123

Claims (10)

  1. 1. The micro-motion intramedullary nail comprises an intramedullary nail main body (1), wherein the intramedullary nail main body (1) is composed of a far-end nail body (2) and a near-end nail body (3), a far-end interlocking screw hole is formed in the far-end nail body (2), and a near-end interlocking screw hole is formed in the near-end nail body (3), and the micro-motion intramedullary nail is characterized in that a micro-motion assembly is arranged between the far-end nail body (2) and the near-end nail body (3), the micro-motion assembly comprises an absorbable block (4) and a limiting nail body (5), the length of the limiting nail body (5) extends into the near-end nail body (3), and a femtosecond laser modified coating (6) for promoting fracture healing is arranged on the outer wall of the intramedullary nail main body (1).
  2. 2. The micro-motion intramedullary nail according to claim 1, wherein the length of the distal nail body (2) is smaller than the length of the proximal nail body (3), and the outer diameter of the distal nail body (2) is the same as the outer diameter of the proximal nail body (3).
  3. 3. The micro-motion intramedullary nail according to claim 1, wherein the limiting nail body (5) and the distal nail body (2) are of an integral structure.
  4. 4. The micro-motion intramedullary nail according to claim 1, wherein the cross section of the limiting nail body (5) is in a gear-shaped design, and the outer diameter of the limiting nail body (5) is smaller than the outer diameter of the distal nail body (2).
  5. 5. The micro-motion intramedullary nail according to claim 1, wherein the absorbable block (4) is made of magnesium alloy or zinc alloy, and the outer diameter of the absorbable block (4) is the same as the outer diameter of the distal nail body (2).
  6. 6. The micro-motion intramedullary nail according to claim 5, wherein the absorbable block (4) is sleeved on the outer wall of the limiting nail body (5), a spline groove (401) is formed in the center of the absorbable block (4), and the spline groove (401) is matched with the shape of the limiting nail body (5) and used for limiting the position of the absorbable block (4).
  7. 7. An inching intramedullary nail according to claim 1, characterized in that the femtosecond laser modified coating (6) covers the middle section of the outer wall of the intramedullary nail body (1).
  8. 8. An inching intramedullary nail according to claim 1, characterized in that the width dimension of the absorbable block (4) is 2-6mm.
  9. 9. The micro-motion intramedullary nail according to claim 1, wherein 3-4 near-end interlocking screw holes are formed in the near-end nail body (3), and 2-3 far-end interlocking screw holes are formed in the far-end nail body (2).
  10. 10. A micro-motion intramedullary nail according to claim 1, wherein the length of the distal nail body 2 is 2-4cm.

Description

Micro-motion intramedullary nail Technical Field The invention relates to the technical field of medical appliances, in particular to a micro-motion intramedullary nail. Background The intramedullary nail is a metal internal fixation instrument for fracture of long bones (femur, tibia, humerus and the like), is mostly made of titanium alloy or stainless steel, realizes central fixation by being implanted into a bone marrow cavity, can effectively resist rotation and shortening by matching with a locking nail, has the advantages of stable mechanics, small soft tissue injury, contribution to bone healing, early functional exercise and the like, and is one of the main stream fixation modes of diaphysis, tibial diaphysis and other diaphysis fracture. Among the prior art, chinese patent with publication No. CN208958301U discloses a humerus intramedullary nail, including the intramedullary nail owner nail, be equipped with the locking screw that is used for forming one-level interlocking structure on the intramedullary nail owner nail, still including setting up the locking spacer that is used for stitching muscle on the locking screw, install the interlocking screw that is used for fixing the fracture piece on the locking spacer, through setting up locking spacer and the interlocking screw that fixes on locking spacer on the locking screw and form second grade interlocking structure, can follow a plurality of positions and fix intramedullary nail owner nail and fracture piece together, improved the fixed stability of humerus intramedullary nail, be favorable to the position maintenance after the complex fracture resets, simple structure is reliable, suitable popularization. In combination with the above materials, the intramedullary nail in the prior art is not matched with the elastic modulus of bone tissue in the actual use process, and can excessively bear stress, so that the bone tissue stress at the fracture part is blocked, the bone mass loss, the osteoporosis and even the secondary fracture are caused, and the fracture healing period is prolonged, therefore, we propose an inching intramedullary nail. Disclosure of Invention The invention aims to provide a micro-motion intramedullary nail, which solves the problems that in the prior art, the elastic modulus of the intramedullary nail is not matched with that of bone tissue in the actual use process, so that the stress of the bone tissue at a fracture part is blocked, the bone mass is lost, osteoporosis and even secondary fracture are caused, and the fracture healing period is prolonged. The micro-motion intramedullary nail comprises an intramedullary nail main body, wherein the intramedullary nail main body consists of a far-end nail body and a near-end nail body, the far-end nail body is provided with a far-end interlocking screw hole, the near-end nail body is provided with a near-end interlocking screw hole, a micro-motion assembly is arranged between the far-end nail body and the near-end nail body, the micro-motion assembly comprises an absorbable block and a limiting nail body, the length of the limiting nail body extends into the near-end nail body, and the outer wall of the intramedullary nail main body is provided with a femtosecond laser modified coating for promoting fracture healing. Further, the length of the distal pin body is smaller than that of the proximal pin body, and the outer diameters of the distal pin body and the proximal pin body are the same. Further, the limiting nail body and the far-end nail body are of an integrated structure. Further, the section of the limiting nail body is in a gear-shaped design, and the outer diameter of the limiting nail body is smaller than that of the distal end nail body. Further, the absorbable block is made of magnesium alloy or zinc alloy, and the outer diameter of the absorbable block is the same as the outer diameter of the distal nail body. Further, the absorbable block is sleeved on the outer wall of the limiting nail body, a spline groove is formed in the center of the absorbable block, and the spline groove is matched with the shape of the limiting nail body and used for limiting the position of the absorbable block. Further, the femtosecond laser modified coating covers the middle section of the outer wall of the main body of the intramedullary nail. Further, the width dimension of the absorbable block is 2-6mm. Further, 3-4 near-end interlocking screw holes are formed in the near-end nail body 3, and 2-3 far-end interlocking screw holes are formed in the far-end nail body 2. Further, the length of the distal pin body 2 is 2-4cm. Compared with the prior art, the invention has the beneficial effects that: 1. This fine motion intramedullary nail, through the fine motion subassembly that sets up between distal end nail body and the proximal end nail body, effectively solved the stress shielding problem that current intramedullary nail and bone tissue elastic modulus mismatch lead to, but the c