Internal locking type nailing device

Abstract

The invention relates to the technical field of nailing devices, and discloses an internal locking type nailing device which comprises a guide nail, the guide nail is sleeved with a spring clamp, a spring support is a cylinder, a plurality of longitudinal holes are formed in the spring support, a locking bolt is arranged outside the spring clamp, a spring sleeve is arranged outside the locking bolt, and the spring sleeve is sleeved with the spring clamp. Six through holes are formed in the spring sleeve, a sliding sleeve is arranged outside the spring sleeve, a locking connecting sleeve is arranged outside the sliding sleeve, a connecting hole is formed in the inner wall of the locking connecting sleeve, and a hand wheel is arranged outside the locking connecting sleeve in a sleeving mode. The guide needle and the screw feeding device can be rigidly connected in the process that the screw tap is screwed in or the vertebral body screw is implanted, the situation that the guide needle accidentally moves forwards due to rotation or advancing of a tool is avoided, the risk that the guide needle penetrates out of a vertebral body and penetrates into an internal organ is fundamentally eradicated, and the safety of a minimally invasive surgery is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of nailing device technology, specifically to an internal locking nailing device. Background Technology

[0002] Spinal vertebral lesions are common and frequently occurring diseases that trouble people. The main treatment for these diseases is surgical removal of the spinal lesions, followed by spinal reconstruction. This surgery typically involves using a spinal stabilization system for vertebral fixation, commonly known as a rod-and-screw system. The rod-and-screw system consists of a spinal rod with pedicle screws installed at both ends. When fixing the rod-and-screw system to the spine, a special tool—a spinal screw installer—is used to secure the pedicle screws.

[0003] For example, CN207886320U discloses a spinal surgery nailing device, which includes a connector connection mechanism, a guide mechanism, and a handle mechanism. The connector connection mechanism includes a connector mounting portion, one end of which is connected to the connector. The guide mechanism includes a first guide body and a second guide body. The first guide body includes a guide sleeve and a connecting portion connected to each other. The guide sleeve is fitted over the connector mounting portion, and the connecting portion is hinged to the second guide body. The handle mechanism includes a grip portion and a rod. One end of the rod is fixedly connected to the grip portion, and the other end of the rod is rotatably connected to the other end of the connector mounting portion. The second guide body is connected to the rod body and can move relative to the rod body. During the rotation of the grip portion, the connector connection mechanism and the connector can rotate synchronously, causing the connector to at least partially extend out of the guide sleeve.

[0004] During minimally invasive spinal surgery, a guide pin needs to be inserted beforehand. During the operation, the guide pin may be affected by other tools, causing it to continue forward, penetrate the vertebral body, and pierce into internal organs, thereby causing harm to the patient. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an internal locking nailer to address the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an internal locking screw inserter, including a guide screw, a spring clip sleeved on the outside of the guide screw, the spring clip being a cylinder with several longitudinal holes inside, a locking bolt on the outside of the spring clip, a spring sleeve on the outside of the locking bolt, six through holes inside the spring sleeve, a sliding sleeve on the outside of the spring sleeve, a locking connecting sleeve on the outside of the sliding sleeve, a connecting hole on the inner wall of the locking connecting sleeve, and a handwheel on the outside of the locking connecting sleeve. Before the operation begins, the guide screw is first inserted into a preset position in the pedicle, and the screw inserter is inserted along the guide screw until its front end abuts against the bone surface. By rotating the locking hexagonal screwdriver at the tail, the locking bolt is driven forward, thereby squeezing the spring clip and entering the spring sleeve. During the compression and contraction process, the multiple clamping arms inside the spring clip evenly grip the guide screw, realizing the mechanical locking of the guide screw and preventing it from moving back and forth.

[0007] Preferably, the outer wall of the handwheel is provided with an anti-slip groove, and the outer wall of the sliding sleeve is fixedly connected with a protrusion. The protrusion is slidably connected inside the connecting hole. There are two protrusions, which are symmetrically arranged on the front and rear outer walls of the sliding sleeve.

[0008] Preferably, the inner wall of the handwheel is provided with a threaded groove, the protrusion is threadedly connected to the threaded groove, and a tightening sleeve is fixedly connected to the left side of the locking connecting sleeve.

[0009] Preferably, the left end of the tightening sleeve is threadedly connected to a first connecting sleeve, and the inner wall of the first connecting sleeve is fixedly connected to an upper nailer. The upper nailer has a tap inside. The locking hexagonal screwdriver is removed, and the tap is installed at the first connecting sleeve at the front end of the upper nailer and fixed by a threaded locking device. The ratchet handle is installed at the tail of the guide pin, and the hexagonal bolt at its front end cooperates with the hexagonal sleeve at the tail of the upper nailer to form a torque transmission structure. The operator holds the handwheel and rotates the ratchet handle to drive the tap to rotate forward along the guide pin. Since the upper nailer body has a left-hand internal thread, and the screwing action is right-hand, during the right-hand screwing process, the internal sliding core rod is acted upon by the left-hand thread, generating an axial displacement tendency opposite to the forward direction. This process ensures that the built-in guide pin will not slide forward with the upper nailer. This reverse sliding tendency is transmitted to the locked guide pin through the locking connecting sleeve, so that the guide pin is always subjected to a backward pulling force during the screwing process, thereby ensuring that the guide pin will not move forward synchronously with the tool.

[0010] Preferably, a hexagonal sleeve is fixedly connected to the right end of the locking connecting sleeve, and a ratchet handle is provided on the outside of the guide pin. The ratchet handle can be removed and replaced. After the guide pin is fixed by locking the hexagonal screwdriver, the locking hexagonal screwdriver is removed, and then the ratchet handle is installed on the outside of the guide pin. The hexagonal bolt on the side of the ratchet handle is sleeved on the outside of the hexagonal sleeve, and the handwheel is held by hand. Turning the ratchet handle can realize the internal locking of the pin.

[0011] Preferably, a hexagonal bolt is fixedly connected to the left end of the ratchet handle. The hexagonal bolt is sleeved on the outside of the guide pin and is located on the side of the hexagonal sleeve. A locking hexagonal screwdriver is provided on the outside of the guide pin. The locking hexagonal screwdriver can be removed and replaced. When preparing for the nailing operation, it is necessary to fix the locking hexagonal screwdriver to the locking bolt, and then use the locking bolt to press the spring clip into the spring sleeve, and then press the spring sleeve into the sliding sleeve. When the spring clip is compressed, it will fix the guide pin and achieve a positioning function.

[0012] The present invention, by adopting the above technical solution, can bring the following beneficial effects:

[0013] 1. This internal locking screw-insertion device, by setting an elastic clamp and locking mechanism that can lock the guide pin, can rigidly connect the guide pin and the screw-insertion device during the tap screwing or vertebral screw implantation process, avoiding the guide pin from accidentally moving forward due to tool rotation or advancement, fundamentally eliminating the risk of the guide pin penetrating the vertebral body and piercing into organs, and greatly improving the safety of minimally invasive surgery.

[0014] 2. This internal locking stapler adopts a hollow structure design and integrates multiple functions such as guide pin locking, tap or screw clamping, and advance / retreat adjustment. It eliminates the need for frequent tool changes, simplifies surgical procedures, and is especially suitable for surgical operations under robot-assisted or minimally invasive conditions.

[0015] 3. This is an internal locking screw inserter. The front end of the screw inserter can be adapted to different types of taps or conical screws, and the tail end is equipped with a ratchet handle interface for easy and quick switching of operating modes. It can be used for tapping or for direct screw insertion, and has good versatility and adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention in the state without nails;

[0017] Figure 2 This is a schematic diagram of the unlocked guide pin state of the present invention;

[0018] Figure 3 This is a partial view of the nailer of the present invention;

[0019] Figure 4 This is an exploded view of the interior of the nailer of the present invention;

[0020] Figure 5 This is a schematic diagram of the completed nailing process of the present invention.

[0021] In the diagram: 1. Guide pin; 2. Spring clip; 3. Locking bolt; 4. Spring sleeve; 5. Sliding sleeve; 6. Locking connecting sleeve; 7. Handwheel; 8. Locking hexagonal screwdriver; 9. Protrusion; 10. Threaded groove; 11. Lifting sleeve; 12. First connecting sleeve; 13. Tap; 14. Hexagonal sleeve; 15. Hexagonal bolt; 16. Ratchet handle. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1-5One embodiment of the present invention is as follows: an internal locking screw inserter includes a guide pin 1, a spring clip 2 sleeved on the outside of the guide pin 1, the spring clip 2 being a cylinder with several longitudinal holes inside, a locking bolt 3 outside the spring clip 2, a spring sleeve 4 outside the locking bolt 3, six through holes inside the spring sleeve 4, a sliding sleeve 5 outside the spring sleeve 4, a locking connecting sleeve 6 outside the sliding sleeve 5, a connecting hole on the inner wall of the locking connecting sleeve 6, and a handwheel 7 sleeved on the outside of the locking connecting sleeve 6. Before the operation begins, the guide pin 1 is first inserted into a preset position in the pedicle, and the screw inserter is inserted along the guide pin until its front end abuts against the bone surface. By rotating the locking hexagonal screwdriver 8 at the tail, the locking bolt 3 is driven forward, thereby squeezing the spring clip 2. Entering the spring sleeve 4, the spring clip 2, during the compression and contraction process, has multiple clamping arms inside that evenly grip the guide pin 1, achieving mechanical locking of the guide pin and preventing it from moving back and forth. The outer wall of the handwheel 7 has an anti-slip groove. The outer wall of the sliding sleeve 5 is fixedly connected to a protrusion 9, which is slidably connected inside the connecting hole. There are two protrusions 9, which are symmetrically arranged on the front and rear outer walls of the sliding sleeve 5. The inner wall of the handwheel 7 has a threaded groove 10, and the protrusion 9 is threadedly connected to the threaded groove 10. The left side of the locking connecting sleeve 6 is fixedly connected to a lifting sleeve 11. The left end of the lifting sleeve 11 is threadedly connected to a first connecting sleeve 12. The inner wall of the first connecting sleeve 12 is fixedly connected to a nailer. The nailer has a tap 13 inside. Remove the locking hexagonal screwdriver 8 and place the tap... 13 is installed at the first connecting sleeve 12 at the front end of the nailer and fixed by a threaded locking device. The ratchet handle 16 is installed at the tail of the guide pin. The hexagonal bolt 15 at the front end of the ratchet handle 16 cooperates with the hexagonal sleeve 14 at the tail of the nailer to form a torque transmission structure. The operator holds the handwheel 7 and rotates the ratchet handle 16, which drives the tap 13 to rotate forward along the guide pin. Since the nailer body has a left-hand internal thread, and the screwing action is right-hand, during the right-hand screwing process, the internal sliding core rod is subjected to the action of the left-hand thread, which produces an axial displacement tendency opposite to the forward direction. This process ensures that the built-in guide pin 1 will not slide forward with the nailer. This reverse sliding tendency is transmitted to the locked guide pin 1 through the locking connecting sleeve 6, so that the guide pin is always pulled backward during the screwing process. The force ensures that the guide pin will not move forward synchronously with the tool. A hexagonal sleeve 14 is fixedly connected to the right end of the locking connecting sleeve 6. A ratchet handle 16 is provided on the outside of the guide pin 1. The ratchet handle 16 can be removed and replaced. After the guide pin 1 is fixed by the locking hexagonal screwdriver 8, the locking hexagonal screwdriver 8 is removed, and the ratchet handle 16 is installed on the outside of the guide pin 1. The hexagonal bolt 15 on the side of the ratchet handle 16 is fitted onto the outside of the hexagonal sleeve 14. By holding the handwheel 7 and turning the ratchet handle 16, the internal locking pin is engaged. A hexagonal bolt 15 is fixedly connected to the left end of the ratchet handle 16. The hexagonal bolt 15 is fitted onto the outside of the guide pin 1 and is located on the side of the hexagonal sleeve 14. A locking hexagonal screwdriver 8 is provided on the outside of the guide pin 1.The locking hex screwdriver 8 can be removed and replaced. During preparation for use with the nailer, the locking hex screwdriver 8 is used to securely connect with the locking bolt 3. The locking bolt 3 then presses the spring clip 2 into the spring sleeve 4, which in turn presses the spring sleeve 4 into the sliding sleeve 5. When the spring clip 2 is compressed, it secures the guide pin 1, achieving a positioning function.

[0024] Working principle: Before the operation begins, the guide pin 1 is first inserted into the preset position of the pedicle. The screw inserter is then inserted along the guide pin until its front end touches the bone surface. By rotating the locking hexagonal screwdriver 8 at the tail, the locking bolt 3 is driven forward, which in turn squeezes the spring clip 2 and enters the spring sleeve 4. During the compression and contraction process, the multiple clamping arms inside the spring clip 2 evenly hold the guide pin 1, thereby achieving mechanical locking of the guide pin and preventing it from moving back and forth.

[0025] Remove the locking hexagonal screwdriver 8, install the tap 13 onto the first connecting sleeve 12 at the front end of the stapler, and fix it with the threaded locking device. Install the ratchet handle 16 onto the tail of the guide pin. The hexagonal bolt 15 at the front end of the ratchet handle 16 engages with the hexagonal sleeve 14 at the tail of the stapler to form a torque transmission structure. The operator holds the handwheel 7 and rotates the ratchet handle 16, causing the tap 13 to rotate forward along the guide pin. Since the stapler body has a left-hand internal thread, while the screwing action is right-hand, during the right-hand screwing process, the internal sliding core rod is acted upon by the left-hand thread, generating an axial displacement tendency opposite to the forward direction. This process ensures that the built-in guide pin 1 will not slide forward with the stapler. This reverse sliding tendency is transmitted to the locked guide pin 1 through the locking connecting sleeve 6, so that the guide pin is always subjected to a backward pulling force during the screwing process, thereby ensuring that the guide pin will not move forward synchronously with the tool.

[0026] This invention provides an internally locking nailer. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. An internal locking type stapler, comprising a guide staple (1), characterized in that: The guide pin (1) is fitted with a spring clip (2). The spring clip (2) is a cylinder with several longitudinal holes inside. The spring clip (2) is fitted with a locking bolt (3). The locking bolt (3) is fitted with a spring sleeve (4). The spring sleeve (4) has six through holes inside. The spring sleeve (4) is fitted with a sliding sleeve (5). The sliding sleeve (5) is fitted with a locking connecting sleeve (6). The inner wall of the locking connecting sleeve (6) has a connecting hole. The locking connecting sleeve (6) is fitted with a handwheel (7).

2. The internal locking nailer according to claim 1, characterized in that: The outer wall of the handwheel (7) is provided with an anti-slip groove, and the outer wall of the sliding sleeve (5) is fixedly connected with a protrusion (9). The protrusion (9) is slidably connected inside the connecting hole. There are two protrusions (9), and the two protrusions (9) are respectively symmetrically arranged on the front and rear outer walls of the sliding sleeve (5).

3. The internal locking nailer according to claim 2, characterized in that: The inner wall of the handwheel (7) is provided with a threaded groove (10), the protrusion (9) is threadedly connected to the threaded groove (10), and the left side of the locking connecting sleeve (6) is fixedly connected with a lifting sleeve (11).

4. The internal locking nailer according to claim 3, characterized in that: The left end of the tightening sleeve (11) is threadedly connected to the outer wall of the first connecting sleeve (12), and the inner wall of the first connecting sleeve (12) is fixedly connected to the nailer, and the nailer is provided with a tap (13) inside.

5. The internal locking nailer according to claim 4, characterized in that: The right end of the locking connecting sleeve (6) is fixedly connected to a hexagonal sleeve (14), and the outside of the guide pin (1) is provided with a ratchet handle (16).

6. The internal locking nailer according to claim 5, characterized in that: The left end of the ratchet handle (16) is fixedly connected to a hexagonal bolt (15), which is sleeved on the outside of the guide pin (1). The hexagonal bolt (15) is located on the side of the hexagonal sleeve (14), and a locking hexagonal screwdriver (8) is provided on the outside of the guide pin (1).

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