Nail feeding device

Abstract

The invention discloses a screw feeding device which is suitable for a pedicle screw. The screw feeding device comprises an implanting mechanism and a torque applying mechanism which are in transmission connection with a pedicle screw; the torque applying mechanism is configured to be in an engaged state and a disengaged state with the implanting mechanism; when the torque applying mechanism and the implantation mechanism are in a joint state, the torque applying mechanism can transmit torque to the implantation mechanism; and when the torque applying mechanism and the implanting mechanism are in a separated state, the torque applying mechanism is separated from the implanting mechanism, so that the torque is prevented from acting on the implanting mechanism in the exiting process of the torque applying mechanism, and the pedicle screw is prevented from loosening. According to the vertebral pedicle screw, the operation time can be shortened, the operation steps can be simplified, the cooperation among instruments can be optimized, the complex operation of a surgeon on the cooperation of the instruments can be reduced, the vertebral pedicle screw cannot be loosened, and bone cement can be rapidly placed at the same time, so that the possibility of bone cement leakage and embolism can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of internal fixation of the spine, and in particular to a nail driver. BACKGROUND

[0002] The posterior pedicle screw fixation system for the spine is a very mature spinal surgery in the treatment of spinal degenerative diseases, fractures, tumors, infections, etc., and has been widely used in the reduction and fixation of diseases related to the spine (such as spinal orthopedics, intervertebral disc height loss, spinal fractures). Generally, fasteners such as pedicle screws (short tail screws, reduction screws, percutaneous screws, cement screws) are inserted through the pedicle and fixed with the vertebral body. However, the traditional spinal internal fixation surgery has a large trauma, extensive soft tissue incision and stripping, which can easily cause excessive bleeding, change the anatomy of the spine, make the vertebral body unstable, prolong the postoperative recovery time and cause other complications. Traditional open surgery has a large trauma to the patient, and elderly or patients with poor overall condition cannot undergo surgery, the recovery period is long, and it is easy to cause postoperative spinal instability, internal fixation loosening, postoperative recurrence and other complications. In particular, elderly patients with osteoporosis are more likely to have internal fixation loosening due to their bone quality.

[0003] In the prior art, after the pedicle screw is implanted, the quick connection handle is removed, the nail driver is retained, and when the two adjacent nail drivers are connected with the pedicle screw at the same time, the problem of spatial interference occurs. Among them, the cement screw is one of the pedicle screws, which improves the structural strength of the vertebral body by injecting bone cement into the vertebral body. The solution of the prior art is usually to remove one of the nail drivers, complete the bone cement injection of the other, and then re-tighten the nail driver. Since it is a percutaneous surgery, it is particularly difficult to blindly match the cement pedicle screw. At the same time, the tightening or re-tightening of the nail driver often causes the pedicle screw to loosen, which can easily cause bone cement leakage and embolism. SUMMARY

[0004] In view of the above problems of the prior art that the pedicle screw needs to be removed, the present application aims to provide a nail driver that can solve the problem of spatial interference between two pedicle screws in adjacent vertebral bodies or two pedicle screws on the same side of the same vertebral body during implantation, can separate the implanting mechanism and the torque applying mechanism from the pedicle screw, shorten the operation time, simplify the operation steps, optimize the cooperation between the instruments, reduce the complex operation of the instruments by the surgeon, and avoid loosening the implanted pedicle screw, bone cement leakage and embolism.

[0005] The specific technical solutions are as follows:

[0006] A nail driver suitable for a pedicle screw;

[0007] The nail driver comprises an implanting mechanism and a torque applying mechanism in transmission connection with the pedicle screw;

[0008] The torque applying mechanism is configured to be able to be in an engaged state and a disengaged state with the implant mechanism;

[0009] When the torque applying mechanism is in the engaged state with the implant mechanism, the torque applying mechanism is able to transmit torque to the implant mechanism;

[0010] When the torque applying mechanism is in the disengaged state with the implant mechanism, the torque applying mechanism is disengaged from the implant mechanism, causing the torque applying mechanism to exit the process of avoiding applying torque to the implant mechanism, avoiding the pedicle screw from loosening.

[0011] The above-described pedicle screw driver, wherein the implant mechanism comprises a first member in driving connection with the pedicle screw, and a second member configured to be able to abut against the first member;

[0012] The second member is provided with a second member external thread that matches the screw seat internal thread of the pedicle screw;

[0013] The second member is configured to, when the second member rotates, move toward the first member, abut against the first member, and / or apply an axial force to the first member based on the screw seat internal thread of the pedicle screw and the second member external thread.

[0014] The above-described pedicle screw driver, wherein the torque applying mechanism comprises a second torque applying member configured to be able to be in an engaged state and a disengaged state with the second member;

[0015] When the second torque applying member is in the engaged state with the second member, the second torque applying member is able to transmit torque to the second member;

[0016] When the second torque applying member is in the disengaged state with the second member, the second torque applying member is disengaged from the second member.

[0017] The above-described pedicle screw driver, wherein the torque applying mechanism further comprises a first torque applying member for applying torque to the pedicle screw through the first member.

[0018] The above-described pedicle screw driver, wherein the second member abuts against an end of the first member;

[0019] The first torque applying member comprises a first ratchet surface provided on the first member and a second ratchet surface provided on the second member;

[0020] driving the first member to rotate based on the cooperation between the first ratchet surface and the second ratchet surface through the rotation of the second member;

[0021] When the second component rotates clockwise, the first ratchet surface and the second ratchet surface engage and transmit power; when the second component rotates counterclockwise, the first ratchet surface and the second ratchet surface jump teeth to prevent the second component from transmitting torque to the first component.

[0022] In the above-mentioned nailing device, the second member is a pressing head, and a first anti-slip member is provided between the first member and the second member, and the first anti-slip member includes:

[0023] A first hook is provided at the end of the first component and a first step groove is provided at the end of the second component. The first hook is snap-fitted with the opening of the first step groove, and the movable limit of the first hook is located within the depth range of the first step groove, so that the first ratchet surface can be separated from the second ratchet surface.

[0024] The above-mentioned nailing device, wherein the second torque applying member comprises: a torsion bar, the second member is provided with a third torque receiving portion, the torsion bar is provided with a third torque applying portion, the third torque applying portion matches the third torque receiving portion;

[0025] The second member is driven to rotate via the torsion bar.

[0026] The above-mentioned nailing device, wherein the torsion bar is provided with a first fastening member, and the second member is provided with a first fastening groove;

[0027] The torque applying mechanism further comprises: a first supporting sleeve provided outside the torsion bar, wherein the first supporting sleeve is movable along the axial direction thereof;

[0028] When the first supporting sleeve covers the first fastener, the first fastener is engaged with the first buckle groove and cannot be separated;

[0029] When the first supporting sleeve is separated from the first fastener, the first fastener is configured to be able to disengage from the first fastener groove.

[0030] The above-mentioned nail driver, wherein the torque applying mechanism also includes: a mounting sleeve, the mounting sleeve is fixed outside the torsion rod, the end of the mounting sleeve is provided with a second step groove, the first supporting sleeve is provided with a second hook, the second hook is snap-fitted with the second step groove, and the second hook moves between the depth range of the second step groove; the head of the first component is a polygonal anti-torsion structure, and the pedicle screw has a cavity adapted to the polygonal anti-torsion structure, when the external thread of the second component is rotated to cooperate with the internal thread of the screw seat of the pedicle screw, the first component falls into and cooperates with the cavity, thereby realizing the torque transmission to the pedicle screw.

[0031] The above-mentioned nailing device, wherein the second component is sleeved outside the first component;

[0032] The first torque applying member comprises:

[0033] a first torque receiving portion and an inner rod provided on the first member, wherein the first torque receiving portion protrudes from the second member, and the inner rod is provided with a first torque applying portion, wherein the first torque applying portion matches the first torque receiving portion;

[0034] The first member is driven to rotate by the inner rod.

[0035] The above-mentioned nailing device, wherein the second torque applying member comprises: an outer sleeve, the outer sleeve is arranged outside the inner rod, the outer sleeve is provided with a second torque applying portion, the second member is provided with a second torque receiving portion, the second torque applying portion matches the second torque receiving portion;

[0036] The second member is driven to rotate by rotating the outer sleeve.

[0037] The above-mentioned nailing device, wherein the inner rod is provided with a second fastening member, and the first member is provided with a second fastening groove;

[0038] The outer sleeve is capable of moving along its axial direction;

[0039] When the outer cover covers the second fastener, the second fastener is engaged with the second buckle groove and cannot be separated;

[0040] When the outer shell is separated from the second fastener, the second fastener is configured to be able to disengage from the second fastener groove.

[0041] The nailing device mentioned above, wherein the first member has a limiting protrusion on the outside, and the end of the second member abuts against the limiting protrusion;

[0042] The limiting protrusion is configured to be limited in the side wall groove of the screw seat of the pedicle screw along the rotation direction of the second member;

[0043] The rotation of the inner rod drives the rotation of the first component, thereby achieving torque transmission to the pedicle screw.

[0044] Rotating the second component moves one end thereof towards the first component and abuts against the limiting protrusion, and also moves the other end of the second component against the end of the inner rod.

[0045] The above-described upper nailer, wherein the second component is a compression sleeve, and a second anti-disengagement component is arranged between the first component and the second component, and the second anti-disengagement component comprises:

[0046] A pin arranged on the inner wall of the second component and a ring cavity arranged on the outer wall of the first component, the pin is movably arranged in the ring cavity, and is limited in the axial force direction between the range of the ring cavity.

[0047] The above-described upper nailer, wherein the torque applying mechanism further comprises: a second supporting sleeve, the second supporting sleeve is arranged outside the outer sleeve, a third stepped groove is arranged on the outer sleeve, a third clamping hook is arranged on the second supporting sleeve, the third clamping hook is buckled with the third stepped groove, and the third clamping hook is movably arranged in the depth range of the third stepped groove; the end of the first component is a polygonal anti-torsion structure, the pedicle screw has a cavity, when the end of the second component is rotationally matched with the internal thread of the screw seat of the pedicle screw, the end of the first component falls into and matches with the cavity, and the rotation of the first component is driven by the inner rod, thereby achieving torque transmission to the pedicle screw.

[0048] The above technical solution has the following positive effects compared with the prior art:

[0049] The present application can separate the implanting mechanism and the torque applying mechanism from the pedicle screw when the space interference problem occurs between two pedicle screws in the adjacent vertebral body or the pedicle screws on both sides of the same vertebral body during the nail placement process, so as to shorten the operation time, simplify the operation steps, optimize the cooperation between the instruments, reduce the complex operation of the instruments by the surgeon, and realize the simultaneous and rapid implantation of the bone cement without loosening the pedicle screw, thereby reducing the possibility of bone cement leakage and embolism. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of the first embodiment of the upper nailer of the present application.

[0051] Figure 2 It is a partial enlarged view of the upper nailer of the present application. Figure 1

[0052] Figure 3 ​Fig. 1 is a schematic view of the structure of an implanting mechanism of a first embodiment of the pedicle screw driver according to the present application;

[0053] Figure 4 Fig. 2 is a partial enlarged view of the pedicle screw driver according to the present application; Figure 1

[0054] Figure 5 Fig. 3 is a schematic view of the structure of a second embodiment of the pedicle screw driver according to the present application;

[0055] Figure 6 Fig. 4 is a partial enlarged view of the pedicle screw driver according to the present application; Figure 5

[0056] Figure 7 Fig. 5 is a schematic view of the structure of an implanting mechanism of the second embodiment of the pedicle screw driver according to the present application;

[0057] Figure 8 Fig. 6 is a schematic view of the structure of the second embodiment of the pedicle screw driver according to the present application installed on a pedicle screw;

[0058] Figure 9 Fig. 7 is a partial enlarged view of the pedicle screw driver according to the present application; Figure 5

[0059] In the drawings: 1, pedicle screw; 2, implanting mechanism; 3, torque applying mechanism; 4, first anti-coming-off member; 5, second anti-coming-off member; 11, screw seat internal thread; 12, cavity; 13, clamping groove; 21, first member; 22, second member; 211, limiting protrusion; 212, first ratchet surface; 221, second member external thread; 222, second ratchet surface; 31, first torque applying member; 32, second torque applying member; 33, mounting sleeve; 34, second supporting sleeve; 311, inner rod; 321, torsion rod; 322, first supporting sleeve; 323, outer sleeve; 331, first torque receiving portion; 332, first torque applying portion; 333, second torque receiving portion; 334, second torque applying portion; 335, third torque receiving portion; 336, third torque applying portion; 41, first clamping hook; 42, first stepped groove; 43, first clamping member; 44, first clamping groove; 45, second stepped groove; 46, second clamping hook; 47, second clamping member; 48, second clamping groove; 51, pin; 52, ring cavity; 53, third stepped groove; 54, third clamping hook. DETAILED DESCRIPTION

[0060] The present application will be further described below in conjunction with the drawings and specific embodiments, but is not limited by the same.

[0061] As shown in Fig. 1, a pedicle screw driver according to a preferred embodiment is shown, which is suitable for a pedicle screw 1. Figures 1 to 9

[0062] ​​​​Further, as a preferred embodiment, the upper driver comprises: an implanting mechanism 2 in transmission connection with the pedicle screw 1 and a torque applying mechanism 3;

[0063] The torque applying mechanism 3 is configured to be capable of being in an engaged state and a disengaged state with the implanting mechanism 2;

[0064] When the torque applying mechanism 3 is in the engaged state with the implanting mechanism 2, the torque applying mechanism 3 is capable of transmitting torque to the implanting mechanism 2;

[0065] When the torque applying mechanism 3 is in the disengaged state with the implanting mechanism 2, the torque applying mechanism 3 is separated from the implanting mechanism 2, so that the torque applying mechanism 3 exits the process to avoid applying torque to the implanting mechanism 2 and avoid loosening the pedicle screw 1.

[0066] Further, the implanting mechanism 2 and the torque applying mechanism 3 are both internally hollow in the axial direction and are in turn opposite to the hollow channel of the pedicle screw 1.

[0067] The present application can solve the problem of spatial interference of two pedicle screws in the adjacent vertebral arch or two pedicle screws on the same side of the vertebral body during the process of placing the screws. The implanting mechanism 2 and the torque applying mechanism 3 can be separated from the pedicle screw 1, so as to shorten the operation time, simplify the operation steps, optimize the cooperation between the instruments, reduce the complex operation of the instruments by the surgeon, and avoid loosening the pedicle screw, so as to realize the simultaneous and rapid placement of the bone cement, thereby reducing the possibility of bone cement leakage and embolism.

[0068] Further, as a preferred embodiment, the implanting mechanism 2 comprises: a first member 21 in transmission connection with the pedicle screw 1 and a second member 22 configured to be capable of abutting against the first member 21;

[0069] The second member 22 is provided with a second member external thread 221 matched with the screw seat internal thread 11 of the pedicle screw 1;

[0070] Wherein, when the second member external thread 221 and the screw seat internal thread 11 of the pedicle screw 1 are tightened with each other, the direction is clockwise, and when the second member external thread 221 and the screw seat internal thread 11 of the pedicle screw 1 are loosened with each other, the direction is counterclockwise.

[0071] The second member 22 is configured to: when the second member 22 rotates, the second member 22 moves towards the first member 21, abuts against the first member 21 and / or applies an axial force to the first member 21 based on the screw seat internal thread 11 of the pedicle screw 1 and the second member external thread 221.

[0072] When the second member 22 rotates in the positive direction (clockwise):

[0073] When the second member 22 is rotated in the positive direction, the second member 22 moves toward the first member 21, abuts against the first member 21, and applies an axial force to the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0074] When the second member 22 is rotated in the positive direction, the second member 22 moves toward the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0075] When the second member 22 is rotated in the positive direction, the second member 22 abuts against the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0076] When the second member 22 is rotated in the positive direction, the second member 22 applies an axial force to the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0077] When the second member 22 is rotated in the negative direction (counterclockwise rotation), the second member 22 moves away from the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0078] When the second member 22 is rotated in the negative direction, the second member 22 moves away from the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0079] When the second member 22 is rotated in the negative direction, the second member 22 disengages from the first member 21, based on the screw seat inner thread 11 of the pedicle screw 1 and the second member outer thread 221.

[0080] Further, as a preferable embodiment, the torque application mechanism 3 includes: a second torque application member 32 configured to be able to be in an engaged state and a disengaged state with the second member 22;

[0081] When the second torque application member 32 is in the engaged state with the second member 22, the second torque application member 32 is able to transmit torque to the second member 22;

[0082] When the second torque application member 32 is in the disengaged state with the second member 22, the second torque application member 32 is separated from the second member 22.

[0083] Further, as a preferable embodiment, the torque application mechanism 3 further includes: a first torque application member 31 for applying torque to the pedicle screw 1 through the first member 21.

[0084] First embodiment:

[0085] As Figures 1 to 4As shown, the second member 22 abuts against the end of the first member 21;

[0086] The first torque applying member 31 comprises a first ratchet surface 212 provided on the tail of the first member 21 and a second ratchet surface 222 provided on the second member 22.

[0087] The rotation of the second member 22 drives the rotation of the first member 21 based on the cooperation of the first ratchet surface 212 and the second ratchet surface 222.

[0088] Further, when the second member 22 rotates clockwise, the first ratchet surface 212 engages and drives the second ratchet surface 222.

[0089] When the second member 22 rotates counterclockwise, the first ratchet surface 212 and the second ratchet surface 222 skip teeth, avoiding the second member 22 from transmitting torque to the first member 21.

[0090] Further, as a preferred embodiment, the head of the first member 21 is a polygonal torsion-resistant structure, the pedicle screw 1 has a cavity 12 matching the head of the first member 21, and when the second member external thread 221 is rotationally matched with the screw seat internal thread 11 of the pedicle screw 1, the first member 21 falls into and cooperates with the cavity 12, thereby realizing torque transmission to the pedicle screw 1. The polygonal torsion-resistant structure of the first member 21 in this embodiment is a column with a rectangular end face, a column with a waist-shaped cross section, a regular polygonal column, a column structure with an arc-shaped end face, or a column with a trapezoidal end face.

[0091] Further, as a preferred embodiment, the second member 22 is a compression head, and the first member 21 and the second member 22 are provided with a first anti-disengagement member 4, which comprises:

[0092] The first hook 41 provided on the end of the first member 21 and the first stepped groove 42 provided on the end of the second member 22 are buckled and matched at the opening of the first stepped groove 42, and the first hook 41 is movably limited within the depth range of the first stepped groove 42, which also allows the first ratchet surface 212 to disengage from the second ratchet surface 222, facilitating the rotation of the first member 21 and the engagement of the first ratchet surface 212 on the second ratchet surface 222.

[0093] Further, as a preferred embodiment, the second torque applying member 32 comprises a torsion rod 321, the second member 22 is provided with a third torque receiving portion 335, the torsion rod 321 is provided with a third torque applying portion 336, and the third torque applying portion 336 is matched with the third torque receiving portion 335.

[0094] The torsion rod 321 drives the rotation of the second member 22.

[0095] Preferably, the third torque applying part 336 and the third torque receiving part 335 are both polygonal structures in cross section, including rectangular, regular polygon, arc, waist-shaped or trapezoidal, etc.

[0096] Further, as a preferred embodiment, the torsion bar 321 is provided with a first clamping member 43, and the second member 22 is provided with a first clamping groove 44.

[0097] The torque applying mechanism further comprises a first supporting sleeve 322 arranged outside the torsion bar 321, which is axially movable.

[0098] When the first supporting sleeve 322 covers the first clamping member 43, the first clamping member 43 is clamped with the first clamping groove 44 and cannot be separated.

[0099] When the first supporting sleeve 322 is separated from the first clamping member 43, the first clamping member 43 is configured to be separated from the first clamping groove 44.

[0100] Further, as a preferred embodiment, the torque applying mechanism 3 further comprises a mounting sleeve 33 fixed outside the torsion bar 321, the end of which is provided with a second stepped groove 45, and the first supporting sleeve 322 is provided with a second clamping hook 46, which is clamped with the second stepped groove 45 and moves within the depth range of the second stepped groove 45. In this embodiment, the mounting sleeve 33 limits the radial displacement of the first supporting sleeve 322 by providing the second stepped groove 45, and the supporting sleeve 322 can change its position axially without affecting the circumferential rotation of the first supporting sleeve 322. The mounting sleeve 33 and the torsion bar 321 are fixed by welding, screw radial top-in, one-piece molding or anti-torsion axial limiting plug-in.

[0101] In this embodiment, the upper nailer is screwed in, the head of the first member 21 can automatically find and place into the pedicle screw, and is locked clockwise. Preferably, the first ratchet surface 212 at the tail of the first member 21 and the second ratchet surface 222 of the compression head are engaged with each other to realize the transmission of torque, thereby realizing the implantation operation of the pedicle screw. The upper nailer is separated, and the compression head is loosened counterclockwise. At this time, the first ratchet surface 212 at the tail of the first member 21 and the second ratchet surface 222 of the compression head are separated from each other, and the thread connecting the pedicle screw 1 and the vertebral body will not rotate due to the withdrawal of the upper nailer, thereby avoiding the loosening of the pedicle screw 1.

[0102] Second embodiment:

[0103] As shown in Figures 5 to 9 , the main structure of this embodiment is basically the same as that of the first embodiment, and the difference lies in that the second member 22 is arranged outside the first member 21.

[0104] The length of the second member 22 is less than the length of the first member 21.

[0105] Further, as a preferred embodiment, the first torque applying member 31 comprises:

[0106] The first torque receiving part 331 is provided on the first member 21 and protrudes from the second member 22, and the inner rod 311 is provided with the first torque applying part 332 which matches the first torque receiving part 331.

[0107] The first member 21 is driven to rotate by the inner rod 311.

[0108] Preferably, the first torque receiving part 331 is located at or near the tail of the first member 21, and the first torque applying part 332 is located at or near the head of the inner rod 311.

[0109] Further, as a preferred embodiment, the second torque applying member 32 comprises: an outer sleeve 323 which is sleeved on the outer side of the inner rod 311, the outer sleeve 323 being provided with the second torque applying part 334, and the second member 22 being provided with the second torque receiving part 333 which matches the second torque applying part 334.

[0110] The second member 22 is driven to rotate by rotating the outer sleeve 323.

[0111] Preferably, the second torque receiving part 333 is located at or near the tail of the second member 22, and the second torque applying part 332 is located at or near the head of the outer sleeve 323.

[0112] Preferably, the cross sections of the first torque applying part 332 and the first torque receiving part 331 are polygonal structures which match each other; the cross sections of the second torque applying part 334 and the second torque receiving part 333 are polygonal structures which match each other; and the polygonal structures include rectangular, regular polygon, arc, waist-shaped or trapezoidal structures.

[0113] Further, as a preferred embodiment, the inner rod 311 is provided with a second clamping part 47, and the first member 21 is provided with a second clamping groove 48.

[0114] The outer sleeve 323 is movable along its axial direction.

[0115] When the outer sleeve 323 covers the second clamping part 47, the second clamping part 47 is clamped with the second clamping groove 48 and cannot be separated.

[0116] When the outer sleeve 323 is separated from the second clamping part 47, the second clamping part 47 is configured to be capable of being separated from the clamping cooperation with the second clamping groove 48.

[0117] Further, as a preferred embodiment, the first member 21 is provided with a limiting protrusion 211, and the end of the second member 22 abuts against the end of the limiting protrusion 211.

[0118] The limiting protrusion 211 is configured to be limited in the screw seat side wall clamping groove 13 of the pedicle screw 1 along the rotation direction of the second member 22.

[0119] The rotation of the first member 21 is driven by the rotation of the inner rod 311, so as to realize the torque transmission to the pedicle screw 1; wherein the second member 22 is provided with a second member outer thread 221 which is matched with the screw seat inner thread 11 of the pedicle screw 1. In the embodiment, the rotation of the second member 22 makes one end thereof move towards the first member 21 and abut against the end of the limiting protrusion 211, and also makes the other end of the second member 22 abut against the end of the inner rod 311; the depth of the first member 21 inserted into the inner rod 311 is increased, and therefore the air tightness of the inner rod 311 and the first member 21 is improved by increasing the contact surface of the outer surface of the inner rod 311 and the first member 21 and the abutment of the end of the second member 22, so as to avoid the bone cement entering the outside of the first member 21 when the pedicle screw 1 is injected with the bone cement. In the embodiment, the inside of the first member 21 and the inner rod 311 are communicated with each other.

[0120] Preferably, the two sides of the limiting protrusion 211 are respectively limited in the two clamping grooves 13 of the screw seat side wall of the pedicle screw 1.

[0121] Further, as a preferred embodiment, the head of the first member 21 is a polygonal anti-torsion structure, the pedicle screw 1 is provided with a cavity 12 which is matched with the head of the first member 21, and when the second member outer thread 221 is rotationally matched with the screw seat inner thread 11 of the pedicle screw 1, the head of the first member 21 falls into and is matched with the cavity 12, and the rotation of the first member 21 is driven by the inner rod 311, so as to realize the torque transmission to the pedicle screw 1. In the embodiment, the polygonal anti-torsion structure of the first member 21 is a column body with rectangular end face, a column body with waist-shaped cross section, a regular polygonal column body, a column body with arc-shaped end face or a column body with trapezoidal end face.

[0122] Further, as a preferred embodiment, the second member 22 is a compression sleeve, and the second anti-disengagement member 5 is arranged between the first member 21 and the second member 22, and the second anti-disengagement member 5 comprises:

[0123] The pin 51 arranged on the inner wall of the second member 22 and the ring cavity 52 arranged on the outer wall of the first member 21, the pin 51 is movably arranged in the ring cavity 52 and is limited in the range of the ring cavity 52 along the axial force direction.

[0124] Preferably, the ring cavity 52 is the dynamic stroke of the second member 22 along the length direction of the second member 22.

[0125] Furthermore, as a preferred embodiment, the torque applying mechanism 3 also includes: a second supporting sleeve 34, the second supporting sleeve 34 is arranged outside the outer sleeve 323, the outer sleeve 323 is provided with a third step groove 53, the second supporting sleeve 34 is provided with a third hook 54, the third hook 54 is snap-fitted with the third step groove 53, and the third hook 54 moves within the depth range of the third step groove 53.

[0126] The above description is only a preferred embodiment of the present invention and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A nailing device, characterized in that: Suitable for pedicle screws; The screw insertion device comprises: an implantation mechanism and a torque application mechanism which are transmission-connected to the pedicle screw; The torque applying mechanism is configured to be in an engaged state and a disengaged state with the implant mechanism; When the torque applying mechanism is in an engaged state with the implant mechanism, the torque applying mechanism is capable of transmitting torque to the implant mechanism; When the torque applying mechanism is in a disengaged state from the implanting mechanism, the torque applying mechanism is separated from the implanting mechanism, so that the torque applying mechanism does not exert torque on the implanting mechanism during withdrawal, thereby preventing the pedicle screw from loosening.

2. The nailing device according to claim 1, characterized in that: The implant mechanism comprises: a first component drivingly connected to the pedicle screw, and a second component configured to abut against the first component; The second member has a second member external thread, and the second member external thread matches the internal thread of the screw seat of the pedicle screw; The second member is configured to move toward the first member, abut against the first member, and / or apply an axial force to the first member based on the screw seat internal thread of the pedicle screw and the second member external thread when the second member is rotated.

3. The nailing device according to claim 2, characterized in that: The torque applying mechanism includes: a second torque applying member configured to be capable of being in an engaged state and a disengaged state with the second member; The second torque applying member is capable of transmitting torque to the second member when the second torque applying member is in an engaged state with the second member; When the second torque applying member is in a disengaged state from the second member, the second torque applying member is separated from the second member.

4. The nailing device according to claim 3, characterized in that: The torque applying mechanism further includes a first torque applying member configured to apply torque to the pedicle screw via the first member.

5. The nailing device according to claim 4, characterized in that: The second member abuts against an end portion of the first member; The first torque applying member includes: a first ratchet surface provided on the first member, and a second ratchet surface provided on the second member; driving the first member to rotate based on the cooperation between the first ratchet surface and the second ratchet surface through the rotation of the second member; When the second component rotates clockwise, the first ratchet surface and the second ratchet surface engage and transmit power; when the second component rotates counterclockwise, the first ratchet surface and the second ratchet surface jump teeth to prevent the second component from transmitting torque to the first component.

6. The nailing device according to claim 5, characterized in that: The second component is a pressing head, and a first anti-slip component is provided between the first component and the second component, and the first anti-slip component includes: A first hook is provided at the end of the first component and a first step groove is provided at the end of the second component. The first hook is snap-fitted with the opening of the first step groove, and the movable limit of the first hook is located within the depth range of the first step groove, so that the first ratchet surface can be separated from the second ratchet surface.

7. The nailing device according to claim 6, characterized in that: The second torque applying member comprises: a torsion bar, a third torque receiving portion is provided on the second member, a third torque applying portion is provided on the torsion bar, and the third torque applying portion matches the third torque receiving portion; The second member is driven to rotate via the torsion bar.

8. The nailing device according to claim 7, characterized in that: The torsion bar is provided with a first fastener, and the second member is provided with a first fastening groove; The torque applying mechanism further comprises: a first supporting sleeve provided outside the torsion bar, wherein the first supporting sleeve is movable along the axial direction thereof; When the first supporting sleeve covers the first fastener, the first fastener is engaged with the first buckle groove and cannot be separated; When the first supporting sleeve is separated from the first fastener, the first fastener is configured to be able to disengage from the first fastener groove.

9. The nailing device according to claim 8, characterized in that: The torque applying mechanism also includes: a mounting sleeve, which is fixed to the outside of the torsion rod, and a second step groove is provided at the end of the mounting sleeve, and a second hook is provided on the first supporting sleeve, and the second hook is snap-fitted with the second step groove, and the second hook moves between the depth range of the second step groove; the head of the first component is a polygonal anti-torsion structure, and the pedicle screw has a cavity adapted to the polygonal anti-torsion structure. When the external thread of the second component is rotated to fit with the internal thread of the screw seat of the pedicle screw, the first component falls into and cooperates with the cavity, thereby realizing the torque transmission of the pedicle screw.

10. The nailing device according to claim 4, characterized in that: The second component is sleeved outside the first component; The first torque applying member comprises: a first torque receiving portion and an inner rod provided on the first member, wherein the first torque receiving portion protrudes from the second member, and the inner rod is provided with a first torque applying portion, wherein the first torque applying portion matches the first torque receiving portion; The first member is driven to rotate by the inner rod.

11. The nailing device according to claim 10, characterized in that: The second torque applying member includes: an outer sleeve, the outer sleeve is arranged outside the inner rod, the outer sleeve is provided with a second torque applying portion, the second member is provided with a second torque receiving portion, and the second torque applying portion matches the second torque receiving portion; The second member is driven to rotate by rotating the outer sleeve.

12. The nailing device according to claim 11, characterized in that: The inner rod is provided with a second fastener, and the first component is provided with a second fastening groove; The outer sleeve is capable of moving along its axial direction; When the outer cover covers the second fastener, the second fastener is engaged with the second buckle groove and cannot be separated; When the outer shell is separated from the second fastener, the second fastener is configured to be able to disengage from the second fastener groove.

13. The nailing device according to claim 10, characterized in that: The first member has a limiting protrusion on the outside, and the end of the second member abuts against the limiting protrusion; The limiting protrusion is configured to be limited in the side wall groove of the screw seat of the pedicle screw along the rotation direction of the second member; The rotation of the first member is driven by the rotation of the inner rod, thereby achieving torque transmission to the pedicle screw; The second component is rotated so that one end thereof moves toward the first component and abuts against the limiting protrusion, and the other end of the second component also abuts against the end of the inner rod.

14. The nailing device according to claim 13, characterized in that: The second component is a compression sleeve, and a second anti-slip component is provided between the first component and the second component. The second anti-slip component includes: A pin is provided on the inner wall of the second component and an annular cavity is provided on the outer wall of the first component. The pin is movably provided in the annular cavity and is limited to a range of the annular cavity along the direction of the axial force.

15. The nailing device according to claim 12, characterized in that: The torque applying mechanism also includes: a second supporting sleeve, which is arranged outside the outer sleeve, and the outer sleeve is provided with a third step groove, and the second supporting sleeve is provided with a third hook, and the third hook is snap-fitted with the third step groove, and the third hook is movable within the depth range of the third step groove; the end of the first component is a polygonal anti-torsion structure, and the pedicle screw has a cavity. When the end of the second component is rotated and matched with the internal thread of the screw seat of the pedicle screw, the end of the first component falls into and matches the cavity, and drives the first component to rotate through the inner rod, thereby realizing the torque transmission of the pedicle screw.

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