Reusable pedicle screw bone cement injection tool

Abstract

The utility model relates to a reusable pedicle screw bone cement injection tool which comprises a screw feeding device, a quick connection handle and a bone cement through pipe, the screw feeding device comprises a hollow inner shaft and an outer sleeve arranged outside the hollow inner shaft in a sleeving mode, and a quick connection connector is arranged at the upper end of the hollow inner shaft; the quick-connection handle is matched with the quick-connection connector and is mounted at the upper end of the hollow inner shaft; and the bone cement through pipe is detachably assembled in the hollow inner shaft and the quick connection handle. The nail device is simple in overall structure and convenient to operate, the nail device and the quick connection handle can be repeatedly used after sterilization, waste of materials is reduced, and product cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of orthopedic medical instruments, and in particular relates to a reusable pedicle screw bone cement injection tool. Background Art

[0002] The posterior spinal pedicle fixation system is currently widely used in surgical treatments for spinal trauma, deformity, degenerative changes, etc. The deformity of the spine is corrected and the stability of the spine is restored through the interaction of nails, hooks, and rods. Among them, the pedicle screws are anchored on the vertebral body to provide mechanical support for the entire posterior spinal pedicle fixation system. For patients with osteoporosis, the problem of pedicle screw loosening is very likely to occur. At this time, hollow side hole pedicle screws can be used, that is, bone cement can be injected into the screw channel of the hollow side hole pedicle screw through the hollow center and side holes of the hollow side hole pedicle screw to enhance the bone-screw interface and improve the holding force of the screw to maintain the stability of the pedicle fixation system.

[0003] At present, bone cement injection tools used clinically to inject bone cement into hollow side hole pedicle screws generally have the following disadvantages: (1) the design and structure of bone cement injection tools are complex, the surgical procedure is cumbersome, and the operation time is increased; (2) bone cement injection tools are disposable consumables with complex structures and cannot be reused, resulting in waste and increasing product costs. Utility Model Content

[0004] The utility model aims to provide a reusable pedicle screw bone cement injection tool to solve the problem that the bone cement injection tool cannot be reused.

[0005] A reusable pedicle screw bone cement injection tool of the utility model is realized in the following way:

[0006] A reusable pedicle screw bone cement injection tool comprising

[0007] The nailer comprises a hollow inner shaft and an outer sleeve sleeved outside the hollow inner shaft, wherein a quick-connect joint is arranged at the upper end of the hollow inner shaft;

[0008] A quick-connect handle, which cooperates with the quick-connect connector and is installed on the upper end of the hollow inner shaft;

[0009] A bone cement passage is detachably assembled in the hollow inner shaft and the quick-connect handle.

[0010] Furthermore, a positioning head is provided at the lower end of the hollow inner shaft to cooperate with the screwdriver slot on the pedicle screw head.

[0011] Furthermore, a threaded section is provided at the lower end of the outer sleeve.

[0012] Furthermore, the quick-connect handle includes a quick-connect sleeve, on which a steel ball is mounted, and the steel ball can be locked in a ring groove on the quick-connect connector.

[0013] Furthermore, the quick-connect handle also includes an outer ring sleeve sleeved outside the quick-connect sleeve, and a spring sleeved on the quick-connect sleeve is arranged inside the outer ring sleeve. When the outer ring sleeve is moved upward relative to the quick-connect sleeve, the steel ball can fall out of the ring groove.

[0014] Furthermore, handle bars are provided on both sides of the quick-connect sleeve, and a pressure rod for locking the bone cement passage is provided inside the handle bar.

[0015] Furthermore, the inner end of the pressure rod is hinged in the handle rod, and the outer end thereof can rotate downwardly toward the handle rod. When the pressure rod is located in the handle rod, the inner end of the pressure rod can lock the bone cement passage.

[0016] Furthermore, the inner end of the pressure rod is provided with a toothed surface.

[0017] Furthermore, a Luer connector is provided on the top of the quick-connect sleeve.

[0018] Furthermore, a limit stop ring with an outer diameter not less than the inner diameter of the Luer connector is provided at the top of the bone cement through tube.

[0019] After adopting the above technical solution, the utility model has the following beneficial effects:

[0020] (1) The utility model has a simple overall structure, and the quick-connect handle cooperates with the nailing device, which is easy to operate, simplifies the surgical operation steps, and effectively saves surgical time;

[0021] (2) The bone cement tube in the utility model is detachably assembled in the nailing device and the quick-connect handle. Only the bone cement tube is a disposable consumable. The nailing device and the quick-connect handle can be reused after sterilization, thereby reducing material waste and lowering product costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a structural diagram of a reusable pedicle screw bone cement injection tool according to a preferred embodiment of the utility model;

[0024] Figure 2 It is a structural diagram of a reusable pedicle screw bone cement injection tool according to a preferred embodiment of the utility model when a bone cement passage tube is loaded;

[0025] Figure 3It is a cross-sectional view of the quick-connect handle portion of the reusable pedicle screw bone cement injection tool according to the preferred embodiment of the utility model;

[0026] Figure 4 It is a structural diagram of a screw driver of a reusable pedicle screw bone cement injection tool according to a preferred embodiment of the utility model;

[0027] Figure 5 It is a structural diagram of a quick-connect handle of a reusable pedicle screw bone cement injection tool according to a preferred embodiment of the utility model;

[0028] Figure 6 It is a structural diagram of a bone cement through-tube of a reusable pedicle screw bone cement injection tool according to a preferred embodiment of the utility model;

[0029] In the figure: a nailing device 1, a hollow inner shaft 11, a quick-connect joint 111, a positioning head 112, an annular groove 113, an outer sleeve 12, a threaded section 121, a quick-connect handle 2, a quick-connect sleeve 21, a steel ball 22, an outer ring sleeve 23, a spring 24, a handle rod 25, a pressure rod 26, a tooth surface 27, a Luer connector 28, a bone cement tube 3, a thin tube section 31, a thick tube section 32, a limit retaining ring 33, a pedicle screw 4, and a screw seat 5. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-6As shown, a reusable pedicle screw bone cement injection tool includes a nail inserter 1, a quick-connect handle 2 and a bone cement tube 3. The nail inserter 1 includes a hollow inner shaft 11 and an outer sleeve 12 sleeved on the outside of the hollow inner shaft 11. The upper end of the hollow inner shaft 11 is provided with a quick-connect joint 111; the quick-connect handle 2 cooperates with the quick-connect joint 111 and is installed on the upper end of the hollow inner shaft 11; the bone cement tube 3 is detachably assembled in the hollow inner shaft 11 and the quick-connect handle 2.

[0033] like Figure 4 As shown, the lower end of the existing bone cement injection tool is a cylinder. When injecting bone cement, it is very easy to cause bone cement to leak into the screw groove. In order to solve this problem, the lower end of the hollow inner shaft 11 is provided with a positioning head 112 that cooperates with the screwdriver groove on the pedicle screw 4.

[0034] The positioning head 112 is shaped to match the screwdriver groove on the screw head of the pedicle screw 4. For example, if the screwdriver groove is in the shape of a plum blossom, the positioning head 112 is in the corresponding plum blossom shape. When injecting bone cement, the positioning head 112 will fit into the screwdriver groove, which can effectively avoid bone cement leakage.

[0035] like Figure 1-2 and Figure 4 As shown, in order to connect the screw driver 1 to the screw seat 5 of the pedicle screw 4 , a threaded section 121 is provided at the lower end of the outer sleeve 12 .

[0036] The outer sleeve 12 and the hollow inner shaft 11 are movably matched, and the outer sleeve 12 can rotate relative to the hollow inner shaft 11, so as to facilitate the assembly or disassembly of the threaded section 121 and the nail seat 5.

[0037] Preferably, a hand-held portion is provided at the upper end of the outer sleeve 12 to facilitate operation of the outer sleeve 12 for rotation.

[0038] The connection method between the outer sleeve 12 and the nail seat 5 is consistent with the connection method of the ordinary nailing device 1, which is in line with the operating habits of clinicians. The quick-connect connector 111 can be set as a universal quick-connect connector 111, and can be compatible with the ordinary nailing handle and the two-in-one nailing handle at the same time. Clinicians can choose according to their needs.

[0039] like Figure 3 and Figure 5 As shown, in this embodiment, in order to achieve quick connection between the hollow inner shaft 11 and the quick-connect handle 2, the quick-connect handle 2 includes a quick-connect sleeve 21, on which a steel ball 22 is installed, and the steel ball 22 can be locked in the annular groove 113 on the quick-connect connector 111.

[0040] After the quick connector 111 is inserted into the quick connector sleeve 21 , the steel ball 22 can be stuck in the annular groove 113 , thereby achieving locking between the quick connector 111 and the quick connector sleeve 21 .

[0041] The quick-connect joint 111 is a multi-faceted cylinder, and the inner hole of the quick-connect sleeve 21 is correspondingly matched therewith, so that the quick-connect sleeve 21 can be prevented from rotating relative to the hollow inner shaft 11 .

[0042] In order to achieve the disengagement of the quick-connect handle 2 from the hollow inner shaft 11, the quick-connect handle 2 also includes an outer ring sleeve 23 sleeved on the outside of the quick-connect sleeve 21, and a spring 24 sleeved on the quick-connect sleeve 21 is arranged inside the outer ring sleeve 23. When the outer ring sleeve 23 is moved upward relative to the quick-connect sleeve 21, the steel ball 22 can fall out of the annular groove 113.

[0043] Specifically, the lower part of the quick-connect sleeve 21 is a constricted neck, and the spring 24 is sleeved on the constricted neck, while the lower inner hole of the outer ring sleeve 23 is a wide-diameter inner hole. When the outer ring sleeve 23 is moved upward relative to the quick-connect sleeve 21, the bottom of the outer ring sleeve 23 moves upward and compresses the spring 24 until the steel ball 22 is located at the wide-diameter inner hole of the outer ring sleeve 23. The steel ball 22 can move outward and escape from the annular groove 113, thereby realizing the separation of the quick-connect handle 2 and the hollow inner shaft 11.

[0044] Preferably, the outer wall of the outer ring sleeve 23 is provided with anti-slip grooves, and the top of the outer ring sleeve 23 is provided with a convex edge extending outward, so that the outer ring sleeve 23 can be conveniently held and lifted upward.

[0045] The quick connection and disconnection method of the quick connection handle 2 is not limited to the above-mentioned one, and any quick connection method commonly used in medical devices can be adopted.

[0046] In order to prevent the bone cement tube 3 from moving randomly, handle bars 25 are provided on both sides of the quick-connect sleeve 21 , and a pressing rod 26 for locking the bone cement tube 3 is provided inside the handle bars 25 .

[0047] In order to fix the bone cement tube 3, the inner end of the pressure rod 26 is hinged in the handle rod 25, and its outer end can rotate downward to the handle rod 25. When the pressure rod 26 is in the handle rod 25, the inner end of the pressure rod 26 can lock the bone cement tube 3.

[0048] Specifically, the inner end of the pressing rod 26 is provided with an arc-shaped groove with a concave cross section, so that it can better match with the outer surface of the bone cement through tube 3, and the cross section of the arc-shaped groove is a shape that is convex outward in the middle.

[0049] When the pressure rod 26 is located in the handle rod 25, the convex position of its arc-shaped groove directly abuts against the outer wall of the bone cement tube 3, thereby pressing it and locking the bone cement tube 3. When the outer end of the pressure rod 26 is pressed down to rotate it, the convex position will rotate downward and will not contact the bone cement tube 3, so that the bone cement tube 3 can be released, which is convenient for disassembly and assembly of the bone cement tube 3.

[0050] like Figure 6As shown, preferably, in order to facilitate the cooperation between the bone cement tube 3 and the pressure rod 26, the bone cement tube 3 includes a thin tube section 31 and a thick tube section 32 located at the upper end of the thin tube section 31, and the thick tube section 32 is cooperated in the quick-connect handle 2 on the inner side of the pressure rod 26, so as to facilitate the cooperation with the pressure rod 26 to achieve locking of the entire bone cement tube 3.

[0051] In order to ensure the stability of the pressing rod 26 when locking the bone cement passage 3 , a tooth surface 27 is provided at the inner end of the pressing rod 26 .

[0052] The arc groove has a tooth surface 27 structure, which can have a certain anti-slip effect.

[0053] In order to enable quick connection with a bone cement injection tool or a channel, a Luer connector 28 is provided at the top of the quick-connect sleeve 21 .

[0054] By providing the Luer connector 28 , the versatility of the quick-connect handle 2 can be increased.

[0055] In order to limit the position of the bone cement tube 3 , a limiting retaining ring 33 with an outer diameter not less than the inner diameter of the Luer connector 28 is provided at the top of the bone cement tube 3 .

[0056] Specifically, the limiting retaining ring 33 is located at the top of the thick pipe section 32 .

[0057] like Figure 1-2 As shown, when bone cement needs to be injected during the operation, the nailing device 1 is first connected to the quick-connect handle 2, and the threaded section 121 at the lower end of the outer sleeve 12 is connected to the nail seat 5, and then the two ends of the pressure rod 26 are pressed down, and the bone cement passage 3 is inserted into the quick-connect handle 2 and the nailing device 1, and matched with the pedicle screw 4. At this time, the bone cement syringe is installed on the Luer connector 28 to form a complete bone cement injection channel.

[0058] In the present invention, the nailing device 1 and the quick-connect handle 2 are reusable products that can be used clinically after repeated sterilization. Only the bone cement tube 3 is a disposable consumable. The structure is simple in design, with less material waste and a single production process, which effectively reduces the product cost. In addition, the nailing device and the quick-connect handle 2 both use conventional surgical operation methods, which conform to clinical operation habits, avoid the doctor's additional learning process, and simplify the surgical operation steps. At the same time, the doctor can choose different accessories to complete the operation according to clinical needs and usage habits, and different modes of switching blood tonics and additional tools are coordinated, which has strong versatility.

[0059] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A reusable pedicle screw bone cement injection tool, characterized in that: include A nailing device (1) comprises a hollow inner shaft (11) and an outer sleeve (12) sleeved on the outside of the hollow inner shaft (11), wherein the upper end of the hollow inner shaft (11) is provided with a quick-connect joint (111); A quick-connect handle (2) which cooperates with the quick-connect connector (111) and is mounted on the upper end of the hollow inner shaft (11); A bone cement passage (3) is detachably mounted in the hollow inner shaft (11) and the quick-connect handle (2).

2. The reusable pedicle screw bone cement injection tool according to claim 1, characterized in that: The lower end of the hollow inner shaft (11) is provided with a positioning head (112) that matches with the screwdriver slot on the screw head of the pedicle screw (4).

3. The reusable pedicle screw bone cement injection tool according to claim 1, characterized in that: The lower end of the outer sleeve (12) is provided with a threaded section (121).

4. The reusable pedicle screw bone cement injection tool according to claim 1, characterized in that: The quick-connect handle (2) comprises a quick-connect sleeve (21), on which a steel ball (22) is mounted, and the steel ball (22) can be locked in an annular groove (113) on the quick-connect connector (111).

5. The reusable pedicle screw bone cement injection tool according to claim 4, characterized in that: The quick-connect handle (2) further comprises an outer ring sleeve (23) sleeved on the outside of the quick-connect sleeve (21), wherein a spring (24) sleeved on the quick-connect sleeve (21) is arranged inside the outer ring sleeve (23), and when the outer ring sleeve (23) is moved upward relative to the quick-connect sleeve (21), the steel ball (22) can be released from the annular groove (113).

6. The reusable pedicle screw bone cement injection tool according to claim 4, characterized in that: Handle bars (25) are arranged on both sides of the quick-connect sleeve (21), and a pressure bar (26) for locking the bone cement passage (3) is arranged inside the handle bar (25).

7. The reusable pedicle screw bone cement injection tool according to claim 6, characterized in that: The inner end of the pressure rod (26) is hinged in the handle rod (25), and the outer end of the pressure rod (26) can rotate downwardly toward the handle rod (25). When the pressure rod (26) is located in the handle rod (25), the inner end of the pressure rod (26) can lock the bone cement passage (3).

8. The reusable pedicle screw bone cement injection tool according to claim 7, characterized in that: The inner end of the pressure rod (26) is provided with a tooth surface (27).

9. The reusable pedicle screw bone cement injection tool according to claim 4, characterized in that: A Luer connector (28) is provided on the top of the quick-connect sleeve (21).

10. The reusable pedicle screw bone cement injection tool according to claim 9, characterized in that: The top of the bone cement through tube (3) is provided with a limit stop ring (33) whose outer diameter is not less than the inner diameter of the Luer connector (28).

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