Search

CN-121971141-A - Femur shaft osteotomy instrument

CN121971141ACN 121971141 ACN121971141 ACN 121971141ACN-121971141-A

Abstract

The invention provides a femoral shaft osteotomy instrument, which relates to the technical field of orthopaedics instruments and comprises a positioning nail, a connecting arm, a guide nail and a guide sliding block. The locating nails in the marrow cavity are forcedly associated with the external guide nails through the connecting arms, so that the central axes of the locating nails and the external guide nails are always kept parallel, the parallelism of the osteotomy face is guaranteed, a rotary locking structure is arranged between the connecting arms and the mounting seat, and flexible adjustment of the multi-dimensional angle and the length is realized by matching with the design of the telescopic arms. The guide sliding block slides along the guide nail and is provided with a damping structure, and the guide sliding block is matched with the limit ball of the cutting piece to realize accurate positioning and stable cutting of the osteotomy position. The invention solves the problems of non-parallel osteotomy face, positioning deviation and inconvenient adjustment of the traditional instrument, has the advantages of stable structure, accurate operation and strong universality, and is suitable for various femoral shaft osteotomy orthopedic operations.

Inventors

  • LI HUIJIE
  • LIU BO
  • LIU SIKAI
  • Ding Xuzhuang
  • Yao Mengxuan
  • LIU YIDING
  • XIANG KUN
  • ZHANG BINQUAN

Assignees

  • 河北医科大学第三医院

Dates

Publication Date
20260505
Application Date
20260310

Claims (10)

  1. 1. A femoral shaft osteotomy instrument, comprising: The device comprises a positioning nail (101), a connecting arm (201), a guide nail (301) and a guide sliding block (401); The upper end of the positioning nail (101) is provided with a mounting seat (102), the upper end of the mounting seat (102) is provided with a rotating hole, one end of the connecting arm (201) is provided with a rotating shaft, the rotating shaft of the connecting arm (201) is inserted into the rotating hole of the mounting seat (102), the connecting arm (201) and the mounting seat (102) are rotationally connected, the connecting arm (201) can be locked between any angle and the mounting seat (102), and then the central axis of the connecting arm (201) is parallel to the central axis of the positioning nail (101) by rotationally adjusting the angle between the connecting arm (201) and the mounting seat (102); The guide pin (301) is inserted into the mounting sleeve (204), and the central axis of the guide pin (301) is parallel to the central axis of the positioning pin (101); The outside sliding connection of guide nail (301) has at least one direction slider (401), direction slider (401) freely slides along the axis direction of guide nail (301), and direction slider (401) can fix in the optional position of guide nail (301).
  2. 2. The femoral shaft osteotomy instrument as in claim 1, wherein a connecting screw hole (1011) is formed in the upper end of the positioning nail (101), a connecting piece (103) is rotatably connected to one end of the mounting seat (102) close to the positioning nail (101), a handle is arranged in the middle of the connecting piece (103), a threaded column is arranged at the lower portion of the connecting piece, the threaded column of the connecting piece (103) is inserted into the connecting screw hole (1011), and the mounting seat (102) is rotatably and detachably connected with the positioning nail (101) through the connecting piece (103).
  3. 3. The femoral shaft osteotomy instrument of claim 2, wherein the connecting piece (103) and the top end of the rotating shaft of the mounting seat (102) are provided with non-circular counter bores, the mounting seat (102) and the corresponding part of the non-circular counter bores of the connecting piece (103) are provided with mounting holes, the locking piece (105) is inserted into the mounting holes of the mounting seat (102) and slides up and down in the mounting holes of the mounting seat (102), the bottom end of the locking piece (105) is provided with non-circular bulges, and the non-circular bulges of the locking piece (105) can be inserted into the non-circular counter bores of the connecting piece (103) so that rotation between the mounting seat (102) and the connecting piece (103) is locked.
  4. 4. The femoral shaft osteotomy instrument of claim 1, wherein a damping member (104) is disposed between the mounting base (102) and the connecting arm (201), wherein the connecting arm (201) is provided with ratchet teeth at a rotational connection with the mounting base (102), and the ratchet teeth of the connecting arm (201) are matched with the damping member (104) to enable rotational damping between the connecting arm (201) and the mounting base (102).
  5. 5. The femoral shaft osteotomy instrument of claim 1, wherein a telescopic arm (203) is further arranged between the connecting arm (201) and the mounting sleeve (204), one end of the telescopic arm (203) is fixedly connected with the mounting sleeve (204), and the other end of the telescopic arm (203) is connected with the connecting arm (201).
  6. 6. The femoral shaft osteotomy instrument of claim 5, wherein a swivel joint (202) is disposed between the telescopic arm (203) and the connecting arm (201), such that the telescopic arm (203) is capable of rotating about a central axis of the connecting arm (201) as a rotation axis near one end of the connecting arm (201).
  7. 7. The femoral shaft osteotomy instrument according to claim 1, further comprising a fixing screw (205), wherein a through hole transversely penetrating through the mounting sleeve (204) is formed in the outer side of the mounting sleeve (204), a fixing hole (302) transversely penetrating through the guide screw (301) is formed in one end of the guide screw (301), the fixing hole (302) is communicated with the through hole of the mounting sleeve (204) after the guide screw (301) is inserted into the mounting sleeve (204), the fixing screw (205) is inserted into the through hole of the mounting sleeve (204) and the fixing hole (302) and used for fixing the guide screw (301) to prevent the guide screw (301) from rotating circumferentially and sliding axially, and meanwhile the guide screw (301) is detachably connected with the mounting sleeve (204), and at least two fixing screws (205), the through hole of the mounting sleeve (204) and the fixing hole (302) are stored.
  8. 8. The femoral shaft osteotomy instrument of claim 1, wherein a sliding through hole (402) is formed in the guide sliding block (401), the guide sliding block (401) is sleeved on the outer side of the guide nail (301) through the sliding through hole (402), and sliding damping exists between the guide sliding block (401) and the guide nail (301), so that the guide sliding block (401) can be fixed at any position of the guide nail (301).
  9. 9. The femoral shaft osteotomy instrument of claim 1, further comprising a cutting piece (501), wherein sliding grooves (502) are respectively formed in two sides of the cutting piece (501), the sliding grooves (502) are L-shaped or T-shaped, limiting grooves (403) are formed in the front end of the guide sliding block (401), at least one limiting ball (404) is embedded in the upper side and the lower side of the inside of the limiting grooves (403), the cutting piece (501) is inserted in the limiting grooves (403), protruding portions of the limiting balls (404) are arranged in the sliding grooves (502), and the cutting piece (501) is limited to slide along the sliding grooves (502) through the limiting balls (404), so that cutting action is completed.
  10. 10. The femoral shaft osteotomy instrument as in claim 1, wherein a dial (106) is provided on the outer side of the rotation hole of the mounting base (102), a pointer is provided on the end face of the rotation shaft of the connection arm (201) and points to the dial (106), and a scale groove (303) is provided on the outer side of the guide pin (301).

Description

Femur shaft osteotomy instrument Technical Field The invention relates to the technical field of orthopaedics instruments, in particular to a femoral shaft osteotomy instrument. Background Femoral shaft osteotomies are common orthopedic operations in orthopedics clinics, and are mainly used for treating diseases such as healing of fracture deformity of femoral shaft, repairing of bone defect after femur tumor resection, lower limb force line correction and the like. The core of the operation is to precisely cut off the diseased or deformed bone segments and ensure the flatness and parallelism of the bone cutting surface so as to be beneficial to the precise butt joint and biomechanical reconstruction of the postoperative bone ends. Currently, the bone cutting instruments commonly used in clinic are mainly divided into two main categories, namely intramedullary positioning and extramedullary positioning. Conventional techniques typically rely on preoperative imaging measurements for planning and performing osteotomies during surgery with simple guides or freehand procedures. In order to improve the precision, part of the existing instruments adopt a mode of inserting a locating rod into a marrow cavity, and attempt to use the central axis of the marrow cavity as an osteotomy datum so as to achieve the effect of anatomic reduction. However, with the current traditional osteotomy apparatus, because the femur cavity is not a perfect standard cylinder and physiological radian exists, the traditional single intramedullary positioning rod is difficult to maintain an absolute geometric center position in the intramedullary cavity, so that the osteotomy guide rod based on the standard is deflected, and finally the osteotomy surface is not parallel, the butt joint angle deviation of the postoperative bone ends is caused, the healing quality is affected, and meanwhile, an intuitive quantitative scale system is lacked in the osteotomy process, so that the setting of the osteotomy position and angle is highly dependent on the personal experience of doctors, and the consistency and repeatability of the operation effect are poor. Therefore, there is a need for a new osteotomy instrument capable of achieving intramedullary placement, having multi-dimensional adjustment, and being stable in operation. Disclosure of Invention The invention provides a femoral shaft osteotomy instrument, which specifically comprises: The device comprises a positioning pin, a connecting arm, a guide pin and a guide sliding block, wherein an installation seat is arranged at the upper end of the positioning pin, a rotating hole is formed in the upper end of the installation seat, a rotating shaft is arranged at one end of the connecting arm, the rotating shaft of the connecting arm is inserted into the rotating hole of the installation seat, the connecting arm and the installation seat are connected in a rotating mode, the connecting arm can be locked between any angle and the installation seat, the central axis of the connecting arm is parallel to the central axis of the positioning pin through rotating the angle between the connecting arm and the installation seat, an installation sleeve is arranged at the other end of the connecting arm, the central axis of the installation sleeve is parallel to the central axis of the connecting arm, the guide pin is inserted into the installation sleeve, the central axis of the guide pin is parallel to the central axis of the positioning pin, at least one guide sliding block is connected to the outer side of the guide pin in a sliding mode, and the guide sliding block can slide freely along the central axis direction of the guide pin and be fixed at any position of the guide pin. Preferably, a connecting screw hole is formed in the upper end of the positioning nail, a connecting piece is rotatably connected to one end, close to the positioning nail, of the mounting seat, a handle is arranged in the middle of the connecting piece, a threaded column is arranged at the lower portion of the connecting piece, and the threaded column of the connecting piece is inserted into the connecting screw hole, so that the mounting seat is rotatably and detachably connected with the positioning nail through the connecting piece. The rotary shaft of the connecting piece and the rotary shaft of the mounting seat are provided with non-circular counter bores, mounting holes are formed in the positions, corresponding to the non-circular counter bores, of the mounting seat, a locking piece is inserted into the mounting holes of the mounting seat and slides up and down in the mounting holes of the mounting seat, non-circular protrusions are arranged at the bottom ends of the locking piece, and the non-circular protrusions of the locking piece can be inserted into the non-circular counter bores of the connecting piece, so that rotation between the mounting seat and the connecting piece is locked. Preferably, a damping piece is arran