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CN-122005034-A - Ilium fixing device for fracture dislocation of sacroiliac joint

CN122005034ACN 122005034 ACN122005034 ACN 122005034ACN-122005034-A

Abstract

The invention relates to the technical field of medical auxiliary instruments, in particular to an ilium fixing device for sacroiliac joint fracture dislocation, which comprises an arc-shaped pelvic external fixing frame and a sacroiliac screw, wherein an arc-shaped sliding groove is formed in the pelvic external fixing frame, a locking seat is connected in a sliding manner in the arc-shaped sliding groove, a locking component used for limiting the locking seat to slide in the arc-shaped sliding groove is arranged on the locking seat, an extension nail is integrally formed at the tail part of the sacroiliac screw, a universal fixing component and a universal limiting component are sequentially arranged on the extension nail along the axial direction of the extension nail, the universal fixing component is used for fixing the implantation depth of the sacroiliac screw, a universal joint is further arranged on the locking seat, and the universal limiting component is used for realizing self-adaptive adjustment and rigid locking of the puncture angle of the sacroiliac screw.

Inventors

  • WANG XIAOBIN
  • HU JIA
  • ZHANG XIAPING

Assignees

  • 中南大学湘雅二医院

Dates

Publication Date
20260512
Application Date
20260323

Claims (10)

  1. 1. The ilium fixing device for sacroiliac joint fracture dislocation comprises an arc-shaped pelvic external fixing frame (1) and a sacroiliac screw (2), and is characterized in that an arc-shaped chute (101) is formed in the pelvic external fixing frame (1), a locking seat (6) is connected in a sliding manner in the arc-shaped chute (101), a locking assembly for limiting the locking seat (6) to slide in the arc-shaped chute (101) is arranged on the locking seat (6), and an extension nail (3) is integrally formed at the tail part of the sacroiliac screw (2); the extension nail (3) is sequentially provided with a universal fixing component (4) and a universal limiting component (5) along the axial direction of the extension nail, the universal fixing component (4) and the universal limiting component (5) are hinged with the extension nail (3), and the universal fixing component (4) is used for vertically locking and connecting with the locking seat (6) and fixing the implantation depth of the sacroiliac screw (2); The locking seat (6) is also provided with a universal joint (8), the universal limiting assembly (5) is fixedly connected with the universal joint (8), and the universal limiting assembly (5) is used for hinging and locking the universal fixing assembly (4) and the locking seat (6) in a coordinated manner, so that the self-adaptive adjustment and rigid locking of the puncture angle of the sacroiliac screw (2) are realized.
  2. 2. The ilium fixing device for sacroiliac joint fracture dislocation according to claim 1, characterized in that the universal fixing component (4) comprises a first ball head (401) connected to the extension nail (3) in a threaded mode, a first sleeve ring (402) is sleeved outside the first ball head (401), the first sleeve ring (402) is in sliding fit with the first ball head (401), a vertical connecting rod (406) is fixedly connected to the bottom of the first sleeve ring (402), and one end, far away from the first sleeve ring (402), of the vertical connecting rod (406) is connected with the locking seat (6) in a threaded mode.
  3. 3. The ilium fixation device for dislocation of sacroiliac joint fracture according to claim 2, characterized in that the sliding fit of the first ball head (401) with the first collar (402) is in particular: A first ball groove (403) corresponding to the shape of the first ball head (401) is formed in the first collar (402), a ring sliding block (404) along the circumferential direction of the sacroiliac screw (2) is formed on the surface of the first ball head (401), and a ring sliding groove (405) corresponding to the ring sliding block (404) is formed in the first collar (403), so that the first collar (402) can only rotationally slide along the circumferential direction of the sacroiliac screw (2).
  4. 4. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 3, characterized in that the locking assembly comprises symmetrical nuts (7), both symmetrical nuts (7) being screwed with the vertical connecting rod (406) and being located at the top and bottom of the locking seat (6), respectively.
  5. 5. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 4, characterized in that the universal joint (8) comprises an extension plate (801) fixedly connected with the locking seat (6), a second ball head (802) is fixedly connected to the extension plate (801), a rod connecting groove (803) is sleeved on the second ball head (802), and the second ball head (802) is in sliding fit with the rod connecting groove (803).
  6. 6. The ilium fixing device for sacroiliac joint fracture dislocation according to claim 5, characterized in that the universal limiting component (5) comprises a third ball head (501) connected to the extension nail (3) through threads, a second lantern ring (502) is sleeved outside the third ball head (501), the second lantern ring (502) is in sliding fit with the third ball head (501), a swinging connecting rod (503) is fixedly connected to the bottom of the second lantern ring (502), and one end, far away from the second lantern ring (502), of the swinging connecting rod (503) can be attached to the bottom of the rod connecting groove (803).
  7. 7. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 6, characterized in that the sliding fit of the second collar (502) with the second ball head (802) is in particular: The second lantern ring (502) is provided with a second ball groove corresponding to the second ball head (802), and the second ball head (802) is in sliding fit with the second ball groove, so that the second lantern ring (502) can realize swing adjustment by taking the second ball head (802) as a ball center.
  8. 8. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 7, characterized in that the second ball head (802) is provided with an arc-shaped engaging groove (8021), and the radian of the engaging groove (8021) is equal to the radian of the swinging connecting rod (503).
  9. 9. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 8, characterized in that a fixation nut (9) is screwed on the rod connection groove (803), and the bottom of the fixation nut (9) can be attached to the outer side wall of the swing connection rod (503).
  10. 10. The ilium fixation device for sacroiliac joint fracture dislocation according to claim 9, characterized in that the diameter of the vertical connecting rod (406) is larger than the diameter of the swinging connecting rod (503).

Description

Ilium fixing device for fracture dislocation of sacroiliac joint Technical Field The invention relates to the technical field of medical auxiliary instruments, in particular to an ilium fixing device for sacroiliac joint fracture dislocation. Background The ilium and waist fixing technology is an orthopedic precise fixing technology aiming at dislocation injury of the sacroiliac joint, realizes anatomic reduction and firm fixation of the sacroiliac joint by constructing a stable anchoring connection structure between ilium and lumbar vertebra segments, provides continuous and stable mechanical support for an injury area, and finally achieves the clinical aims of promoting fracture healing and reconstructing biomechanical stability of a pelvic ring. In the prior art, for example, chinese patent document with publication number CN119949988a proposes a locking device for sacroiliac joint and sacrum unstable fracture, which optimizes the connection mechanism of screw and lumbar locking plate (through split type bolt connection and fixation) aiming at the multi-dimensional angle penetration requirement of screw for connecting sacroiliac joint, increases the freedom of screw for fixing sacroiliac joint, and improves the adaptability and operation convenience of different fracture parts in clinic. The sacroiliac joint is used as a mechanical transfer pivot of the spine and pelvis, and is required to transmit the whole axial load of the upper body and bear complex shearing force and torsion stress generated by actions such as walking, turning and the like, so that an internal fixing system for maintaining the stability of the sacroiliac joint is required to have excellent anti-extraction force and anti-fatigue strength, however, the conventional ilium fixing device with the multi-degree-of-freedom adjusting function realizes flexible adaptation of an implantation angle through bolting, and the bone holding force of a screw and the torsion resistance and anti-extraction mechanical property of the whole system are inevitably weakened, so that the ilium fixing device for fracture dislocation of the sacroiliac joint is required to be developed urgently, and the stability requirement under extreme mechanical load is met while the implantation flexibility is maintained. Disclosure of Invention In order to solve the problems, the invention provides an ilium fixing device for fracture dislocation of sacroiliac joints, which is used for respectively limiting and fixing the depth and the angle of a sacroiliac screw through a universal fixing assembly and a universal limiting assembly, so that the problem of mechanical property weakening caused by the improvement of the degree of freedom of the conventional device is solved. In order to achieve the aim, the technical scheme of the invention is that the ilium fixing device for fracture dislocation of the sacroiliac joint comprises an arc-shaped pelvic external fixing frame and a sacroiliac screw, wherein an arc-shaped chute is arranged on the pelvic external fixing frame, a locking seat is connected in a sliding manner in the arc-shaped chute, a locking component for limiting the locking seat to slide in the arc-shaped chute is arranged on the locking seat, and an extension nail is integrally formed at the tail part of the sacroiliac screw; the universal fixing assembly and the universal limiting assembly are hinged with the extension nail, and the universal fixing assembly is used for being vertically locked and connected with the locking seat to fix the implantation depth of the sacroiliac screw; The locking seat is also provided with a universal joint, the universal limiting assembly is fixedly connected with the universal joint, and the universal limiting assembly is used for hinging and locking the locking seat in cooperation with the universal fixing assembly, so that the self-adaptive adjustment and rigid locking of the sacroiliac screw puncture angle are realized. The technical principle of the scheme is that the extension nail is integrally formed at the tail part of the sacroiliac screw, the universal fixing assembly and the universal limiting assembly are sequentially arranged in the axial direction of the extension nail, the accurate fixation of the implantation depth of the sacroiliac screw is realized by utilizing the vertical locking connection of the universal fixing assembly and the locking seat, meanwhile, the self-adaptive adjustment of the puncture angle of the sacroiliac screw is realized by combining the sliding adjustment of the locking seat in the arc-shaped chute through the cooperation of the universal limiting assembly and the universal joint on the locking seat, and finally, the rigid locking is completed through the locking assembly, so that the stable ilium fixing system with the depth fixation and the angle adaptation is constructed. The adoption of the scheme has the following beneficial effects: 1. According to the scheme, through the dual-hing