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CN-224206881-U - Minimally invasive pedicle screw connecting rod taking-out instrument

CN224206881UCN 224206881 UCN224206881 UCN 224206881UCN-224206881-U

Abstract

The application discloses a minimally invasive pedicle screw connecting rod taking-out instrument, which relates to the field of medical instruments, and comprises a handheld part, a sleeve, a push rod, a pushing piece and an elastic piece, wherein when the minimally invasive pedicle screw connecting rod taking-out instrument works, the push rod is sleeved on the screw connecting rod through a sleeve ring and rotates the push rod to enable the pushing piece to be pushed out to the lower end of the sleeve against the elastic force of the elastic piece, and the pushing piece is propped against the screw connecting rod sleeved in the sleeve ring so as to realize stable connection with the screw connecting rod.

Inventors

  • Shi Jiangyuan
  • LIAO LIYU
  • WU YUNYAN
  • FENG JIAWEI
  • LIN YIZHONG

Assignees

  • 江门市人民医院

Dates

Publication Date
20260508
Application Date
20250205

Claims (10)

  1. 1. The minimally invasive pedicle screw connecting rod extraction instrument is characterized by comprising a handheld part (100), a sleeve (200), a push rod (300), a pushing piece (400) and an elastic piece (500); The sleeve (200) is arranged on the handheld part (100), the handheld part (100) is provided with a through hole (101) communicated with the sleeve (200), the inner circumference of the through hole (101) or the sleeve (200) is provided with an internal thread, and one end of the sleeve (200) away from the handheld part (100) is provided with a collar (600) used for being sleeved on a screw connecting rod (700); The ejector rod (300) is arranged in the through hole (101) and the sleeve (200) in a penetrating mode, and the ejector rod (300) is provided with external threads matched with the internal threads; The propping piece (400) is arranged in the sleeve (200) in a sliding manner along the axial direction of the sleeve (200), the propping piece (400) is positioned between the sleeve ring (600) and the ejector rod (300), and the elastic piece (500) is arranged between the sleeve (200) and the propping piece (400).
  2. 2. The minimally invasive pedicle screw connection rod extraction instrument of claim 1, characterized in that an end of the ejector rod (300) facing away from the collar (600) is provided with a swivel head (301).
  3. 3. The minimally invasive pedicle screw connection rod extraction instrument according to claim 1, wherein the propping piece (400) comprises a disc (401), a guide block (402) and a top plate (403), the disc (401) is arranged in the sleeve (200), a sliding groove (201) is formed in the inner periphery of the sleeve (200) along the axial direction of the disc, one end of the guide block (402) is arranged in the sliding groove (201), the other end of the guide block is connected with the disc (401), the elastic piece (500) is arranged between the sleeve (200) and the guide block (402), and the top plate (403) is arranged on one side, away from the ejector rod (300), of the disc (401) and is used for propping against the screw connection rod (700) in the sleeve ring (600).
  4. 4. The minimally invasive pedicle screw connecting rod extraction instrument of claim 3, wherein spring mounting grooves are formed in the inner wall of the sliding groove (201) and the guide block (402), the elastic piece (500) is configured as a spring, two ends of the spring are respectively arranged in the spring mounting grooves of the sleeve (200) and the guide block (402), and the expansion and contraction directions of the spring are consistent with the axial direction of the sleeve (200).
  5. 5. A minimally invasive pedicle screw connection rod extraction instrument as claimed in claim 3, characterized in that the screw connection rod (700) is provided with a recess (701), the top plate (403) being insertable into the recess (701) in the axial direction of the cannula (200).
  6. 6. The minimally invasive pedicle screw connection rod extraction instrument of claim 5, wherein the ejector rod (300) is provided with length graduations (302) on its outer circumference in the axial direction.
  7. 7. The minimally invasive pedicle screw connection rod extraction instrument according to any one of claims 3-6, wherein the cannula (200) comprises a cannula body (203) and a tip tube (204), one end of the cannula body (203) is arranged on the handheld portion (100) and the other end of the cannula body is detachably connected with the tip tube (204), the ejector rod (300) is in threaded fit with the cannula body (203), the collar (600) is arranged at the end, away from the tip tube (204), of the tip tube (204), the sliding groove (201) is arranged on the inner periphery of the tip tube (204), the propping piece (400) is slidably arranged in the tip tube (204), and the elastic piece (500) is arranged between the tip tube (204) and the propping piece (400).
  8. 8. The minimally invasive pedicle screw connection rod extraction instrument of claim 7, characterized in that at least part of the end face of the sleeve body (203) is configured as an upper top wall of the chute (201).
  9. 9. The minimally invasive pedicle screw connection rod extraction instrument according to claim 7, characterized in that an end surface of the sleeve body (203) facing the tip tube (204) is provided with a slot (205) along an axial direction thereof, an inner circumference of the sleeve body (203) is provided with a ring slot (206) communicated with the slot (205), an end surface of the tip tube (204) is provided with a locking tongue portion (207), and the locking tongue portion (207) can pass through the slot (205) and rotate into the ring slot (206).
  10. 10. The minimally invasive pedicle screw connection rod extraction instrument of claim 9, wherein the end face of the sleeve body (203) is magnetically engaged with the end face of the tip tube (204).

Description

Minimally invasive pedicle screw connecting rod taking-out instrument Technical Field The application relates to the field of medical instruments, in particular to a minimally invasive pedicle screw connecting rod taking-out instrument. Background Minimally invasive treatment is often adopted in the existing spinal surgery, and the trauma to a patient can be reduced as much as possible while the expected treatment effect is achieved. The existing medical instruments adopted when the screw connecting rod on the spine is taken out are basically rod holders or Ke Keqian, and the medical instruments have the problems that (1) the screw connecting rod cannot be gripped because the incision is too small to enter a wound, and (2) the screw connecting rod cannot be gripped effectively, so that in actual clinic, the surgical incision is often required to be enlarged or the surgical instrument is excessively pulled in a limited incision, and great surgical wounds are caused to patients. Disclosure of utility model The embodiment of the application provides a minimally invasive pedicle screw connecting rod extraction instrument, which is used for solving the problems. The embodiment of the application provides a minimally invasive pedicle screw connecting rod taking-out instrument which comprises a handheld part, a sleeve, a push rod, a pushing piece and an elastic piece, wherein the sleeve is arranged on the handheld part, a through hole communicated with the sleeve is formed in the handheld part, internal threads are formed in the through hole or the inner periphery of the sleeve, a lantern ring used for being sleeved on the screw connecting rod is arranged at one end of the sleeve, which is away from the handheld part, the push rod penetrates through the through hole and the sleeve, the push rod is provided with external threads matched with the internal threads, the pushing piece is arranged in the sleeve in a sliding mode along the axial direction of the sleeve, the pushing piece is arranged between the lantern ring and the push rod, and the elastic piece is arranged between the sleeve and the pushing piece. The minimally invasive pedicle screw connecting rod extraction instrument has at least the following beneficial effects: When the screw connecting rod taking-out device works, the sleeve ring is sleeved on the screw connecting rod and the ejector rod is rotated, so that the ejector rod overcomes the elastic force of the elastic piece to eject the ejection piece outwards to the lower end of the sleeve pipe, and the ejection piece is abutted against the screw connecting rod sleeved in the sleeve ring so as to realize stable connection with the screw connecting rod. Drawings Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings: FIG. 1 is a schematic view of a connecting rod extraction apparatus according to a first embodiment of the present application; FIG. 2 is a perspective view at A in FIG. 1; FIG. 3 is a front view (schematic perspective view) of a connecting rod removal instrument according to a first embodiment of the present application; FIG. 4 is a schematic view of the jack of FIG. 1; fig. 5 is an enlarged view at B in fig. 3; FIG. 6 is a schematic view of a connecting rod removal instrument coupled to a screw connecting rod according to a first embodiment of the present application; FIG. 7 is a schematic view of a connecting rod extraction apparatus (illustrating a partial structure) according to a second embodiment of the present application; FIG. 8 is a schematic view of a sleeve and a puller of a connecting rod extraction instrument according to a second embodiment of the present application; FIG. 9 is a diagram showing a process of the latch portion being snapped into the annular groove (FIG. a illustrates the latch portion before being snapped into the annular groove, and FIG. b illustrates the latch portion after being snapped into the annular groove) according to the second embodiment of the present application; 100. The hand-held part is provided with 101, a through hole, 102 and an indication surface; 200. The sleeve comprises a sleeve body, a sleeve 201, a chute 202, a first spring mounting groove 203, a sleeve body 204, a tip pipe 205, a slot 206, a ring groove 207, a lock tongue part 208, a connecting part 209 and a lock tongue; 300. a push rod; 301, a rotating head, 302, a length scale, 303, and external threads; 400. The clamping piece, 401, a wafer, 402, a guide block, 403, a top plate, 404 and a second spring mounting groove; 500. an elastic member; 600. a collar; 700. screw connecting rod 701, groove. Detailed Description Features a