Minimally invasive pedicle screw connecting rod taking-out instrument

Abstract

The utility model discloses a minimally invasive pedicle screw connecting rod taking-out instrument, and relates to the field of medical instruments, and the minimally invasive pedicle screw connecting rod taking-out instrument comprises a handheld part, a sleeve, an ejector rod, an ejecting piece and an elastic piece; in the working process, the screw connecting rod is sleeved with the lantern ring, the ejector rod is rotated, the ejector rod overcomes the elastic force of the elastic piece to eject the jacking piece outwards to the lower end of the sleeve, and the jacking piece abuts against the screw connecting rod arranged in the lantern ring in a sleeved mode so that stable connection between the jacking piece and the screw connecting rod can be achieved; only one small sleeve is needed for operation at the wound position, an operative incision does not need to be enlarged, stable connection with the screw connecting rod can be guaranteed in a threaded abutting mode, and the screw connecting rod is prevented from falling off in the taking-out process.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more particularly to a minimally invasive pedicle screw removal device. Background Technology

[0002] Minimally invasive treatment is frequently used in existing spinal surgeries to minimize trauma to patients while achieving the desired therapeutic effect. Currently, the medical instruments used for removing screws from the spine are mainly rod holders or Kirk forceps. These instruments have the following problems in minimally invasive treatment: (1) they cannot enter the wound due to the small incision, making it difficult to grasp the screw; (2) they cannot effectively grasp the screw. Therefore, in actual clinical practice, it is often necessary to enlarge the surgical incision or perform excessive traction within the limited incision, causing great surgical trauma to the patient. Utility Model Content

[0003] This application provides a minimally invasive pedicle screw connector removal device to solve the above-mentioned problems.

[0004] This application provides a minimally invasive pedicle screw connector removal device, including a handle, a sleeve, a push rod, a clamping member, and an elastic member. The sleeve is disposed on the handle, and the handle has a through hole communicating with the sleeve. The through hole or the inner circumference of the sleeve has an internal thread. The end of the sleeve opposite to the handle has a collar for being fitted onto the screw connector. The push rod passes through the through hole and the sleeve, and the push rod has an external thread that mates with the internal thread. Along the axial direction of the sleeve, the clamping member is slidably disposed within the sleeve, and the clamping member is located between the collar and the push rod. The elastic member is disposed between the sleeve and the clamping member.

[0005] The minimally invasive pedicle screw connector removal device of this application has at least the following beneficial effects:

[0006] In operation, the screw connecting rod removal instrument of this application uses a collar to enclose the screw connecting rod and rotates the push rod to overcome the elastic force of the elastic element, pushing the clamping member outward to the lower end of the sleeve. The clamping member abuts against the screw connecting rod fitted inside the collar, thereby achieving a stable connection with the screw connecting rod. This application only requires a thin sleeve to operate at the wound site, without enlarging the surgical incision. Furthermore, the use of a threaded clamping method can ensure a stable connection with the screw connecting rod and prevent the screw connecting rod from falling off during the removal process. Attached Figure Description

[0007] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0008] Figure 1 This is a schematic diagram of the connecting rod removal device in Embodiment 1 of this application;

[0009] Figure 2 yes Figure 1 Perspective view at point A in the middle;

[0010] Figure 3 This is a front view (showing perspective shape) of the connecting rod removal device in Embodiment 1 of this application;

[0011] Figure 4 yes Figure 1 Schematic diagram of the center clamping component;

[0012] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0013] Figure 6 This is a schematic diagram of the connecting rod removal device and the screw connecting rod connected in Embodiment 1 of this application;

[0014] Figure 7 This is a schematic diagram of the connecting rod removal device in Embodiment 2 of this application (showing a partial structure);

[0015] Figure 8 This is a schematic diagram of the sleeve and clamping component of the connecting rod removal device in Embodiment 2 of this application;

[0016] Figure 9 This is a diagram showing the process of the locking tongue engaging in the ring groove in Embodiment 2 of this application (Figure a shows the process before engaging in the ring groove, and Figure b shows the process after engaging in the ring groove).

[0017] 100. Handheld part; 101. Through hole; 102. Indicator surface;

[0018] 200. Sleeve; 201. Slide groove; 202. First spring mounting groove; 203. Sleeve body; 204. End tube; 205. Slot; 206. Annular groove; 207. Locking tongue; 208. Connecting part; 209. Locking tongue;

[0019] 300. Push rod; 301. Rotating head; 302. Length scale; 303. External thread;

[0020] 400. Tightening component; 401. Circular plate; 402. Guide block; 403. Top plate; 404. Second spring mounting slot;

[0021] 500. Elastic components;

[0022] 600, ring;

[0023] 700, screw connecting rod; 701, groove. Detailed Implementation

[0024] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0026] Example 1:

[0027] like Figure 1 and Figure 2 As shown, this embodiment discloses a minimally invasive pedicle screw connector removal instrument for removing a screw connector 700 from the human body. The minimally invasive pedicle screw connector removal instrument includes a handheld part 100, a sleeve 200, a push rod 300, a clamping member 400, and an elastic member 500. The push rod 300 drives the clamping member 400 to clamp the screw connector 700 against the lower end of the sleeve 200, so that the operator can remove the screw connector 700 through the handheld part 100.

[0028] like Figure 3 As shown, the handheld part 100 is provided with a through hole 101, which makes it convenient for staff to hold and take out instruments for operation.

[0029] like Figure 3As shown, one end of the sleeve 200 is disposed on the handle 100, and the sleeve 200 is coaxially connected to the through hole 101 on the handle 100. In some embodiments, the sleeve 200 and the handle 100 can be integrally formed. A collar 600 is provided at the end of the sleeve 200 away from the handle 100. The axial direction of the collar 600 is perpendicular to the axial direction of the sleeve 200, and the collar 600 can be sleeved on the outer periphery of the screw connecting rod 700.

[0030] like Figure 3 As shown, the push rod 300 is coaxially inserted into the through hole 101 of the handheld part 100 and the sleeve 200. The outer circumference of the push rod 300 is provided with an external thread 303, and the inner circumference of the sleeve 200 is provided with an internal thread that mates with the external thread 303, or the through hole 101 is provided with an internal thread that mates with the external thread 303. By rotating one end of the push rod 300, the other end of the push rod 300 can move in a direction away from the handheld part 100. In some embodiments, one end of the push rod 300 is provided with a rotating head 301, which allows the operator to rotate the push rod 300 threadedly forward or backward.

[0031] like Figure 4 and Figure 5 As shown, the clamping member 400 is slidably disposed within the sleeve 200; along the axial direction of the sleeve 200, the collar 600, the clamping member 400, and the push rod 300 are arranged in sequence. When the push rod 300 is screwed in, the end of the push rod 300 can abut against the clamping member 400 and drive the clamping member 400 to extend to the lower end of the sleeve 200. After the clamping member 400 extends out of the lower end of the sleeve 200, it continues to extend into the collar 600 and abuts against the screw connecting rod 700 inside the collar 600, thereby causing the screw connecting rod 700 to be clamped inside the collar 600.

[0032] In this embodiment, as Figure 4 and Figure 5As shown, the clamping member 400 includes a disc 401, a guide block 402, and a top plate 403. The outer diameter of the disc 401 matches the inner diameter of the sleeve 200. Specifically, the outer diameter of the disc 401 is 0.95 to 0.99 times (e.g., 0.98 times) the inner diameter of the sleeve 200. The disc 401 is coaxially and slidably disposed inside the sleeve 200. The end of the push rod 300 can contact the upper surface of the disc 401. One end of the guide block 402 is connected to the outer circumference of the disc 401. A groove 201 is provided on the inner circumference of the sleeve 200. The other end of the guide block 402 is slidably disposed in the groove 201. The cross-sectional shape of the guide block 402 is consistent with the cross-sectional shape of the groove 201, and the length direction of the groove 201 is consistent with the axial direction of the sleeve 200. That is, the groove 201 extends along the axial direction of the sleeve 200. Through the cooperation of the guide block 402 and the groove 201, the disc 401 is restricted to sliding only in the axial direction of the sleeve 200. In this embodiment, there are two guide blocks 402, and two grooves 201 are correspondingly provided with two guide blocks 402. The top plate 403 is disposed on one side surface of the disc 401. The top plate 403 is located on the side of the disc 401 away from the top rod 300. The top plate 403 can slide to the lower end of the sleeve 200 and tighten the screw connecting rod 700.

[0033] like Figure 5 As shown, an elastic element 500 is disposed between the sleeve 200 and the clamping element 400. The elastic element 500 is used to drive the clamping element 400 to return to its original position away from the screw connecting rod 700. In this embodiment, the elastic element 500 is preferably a spring. A first spring mounting groove 202 is provided on the inner bottom wall of the slide groove 201, and a second spring mounting groove 404 is provided on the lower surface of the guide block 402. One end of the spring is disposed in the first spring mounting groove 202, and the other end of the spring is disposed in the second spring mounting groove 404. The extension and contraction direction of the spring is consistent with the axial direction of the sleeve 200. The elastic element 500 and the guide block 402 are provided in a one-to-one correspondence.

[0034] like Figure 6 As shown, in some preferred embodiments, the screw connecting rod 700 is provided with a groove 701. Under the drive of the push rod 300, the top plate 403 can move downward and insert into the groove 701, abutting against the inner wall of the groove 701. The push rod 300 is provided with a length scale 302 on its outer peripheral wall near the rotating head 301 (e.g., Figure 3 As shown), the length scale 302 is arranged along the axial direction of the push rod 300, and the upper surface of the handheld part 100 opposite to the rotating head 301 (a surface opposite along the sleeve axial direction) can serve as the indicating surface 102 of the length scale 302 (as shown). Figure 3As shown, when the top rod 300 is screwed downwards, the length scale 302 corresponding to the indicator surface 102 gradually changes. When the top plate 403 is pressing down against the outer circumference of the screw connecting rod 700 and is not accurately inserted into the groove 701, the indicator surface 102 corresponds to the first scale value. If the top plate 403 is accurately inserted into the groove 701, the depth of the groove 701 allows the top plate 403 to sink a small distance. At this time, the indicator surface 102 corresponds to the second scale value. By using the different scale values ​​corresponding to the indicator surface 102, feedback can be given to the operator as to whether the top plate 403 is accurately inserted into the groove 701 of the screw connecting rod 700. The insertion of the top plate 403 into the groove 701 makes the connection between the entire instrument and the screw connecting rod 700 more stable, and can prevent the screw connecting rod 700 from separating from the collar 600 along the axial direction of the collar 600. In actual operation, if the top plate 403 is not accurately inserted into the groove 701, the top rod 300 can be threaded back first, so that the top plate 403 is pulled back under the action of the elastic element 500. Then, the position of the top plate 403 can be adjusted and pressed down again.

[0035] It should be noted that when the top plate 403 is inserted into the groove 701 of the screw connecting rod 700 and abuts against the inner bottom wall of the groove 701, the lower surface of the guide block 402 also abuts against the inner bottom wall of the slide groove 201, thereby restricting the guide block 402 from moving further down, which in turn restricts the top plate 403 from continuing to tighten the screw connecting rod 700 excessively downward.

[0036] The working principle of the retrieval instrument in this embodiment is as follows:

[0037] The push rod 300 retracts its thread, causing the top plate 403 to retract into the sleeve 200. Then, the worker holds the handle 100 and inserts the collar 600 into the wound area, fitting the collar 600 onto the end of the screw connecting rod 700 (the end has a groove 701). The rotating head 301 then drives the push rod 300 to be threaded in, with one end of the push rod 300 abutting against the disc 401 and causing the top plate 403 to extend axially into the collar 600 along the sleeve 200. If... When the top plate 403 and the groove 701 are aligned, the top plate 403 can be inserted into the groove 701. The length scale 302 on the push rod 300 will indicate to the staff that the top plate 403 has been aligned and inserted. Otherwise, the push rod 300 needs to be retracted and repositioned before being inserted again until the top plate 403 is aligned and inserted into the groove 701. At this point, the screw connecting rod 700 and the instrument are stably connected, and the staff can remove the screw connecting rod 700 from the patient's body by hand.

[0038] Example 2:

[0039] The difference between this embodiment and embodiment one is that the sleeve 200 in this embodiment adopts a two-section structure, as detailed below:

[0040] like Figure 7 As shown, the sleeve 200 includes a sleeve body 203 and an end tube 204. One end of the sleeve body 203 is connected to the handheld part 100, and the end tube 204 is detachably coaxially disposed on the other end of the sleeve body 203. The detachable method here can refer to the prior art. The push rod 300 is threadedly connected to the sleeve body 203, and one end of the push rod 300 can extend into the end tube 204 and abut against the clamping member 400 slidably disposed in the end tube 204. That is, the end tube 204 is provided with the sliding groove 201 and the elastic member 500.

[0041] In this second embodiment, the 200mm sleeve is designed in sections, which facilitates manufacturing and makes it easier to clean and maintain each structure.

[0042] like Figure 8 As shown in the second embodiment, the slide groove 201 is formed inside the end tube 204, and the upper part of the slide groove 201 directly connects to the upper end face of the end tube 204. The inner bottom wall of the slide groove 201 is located inside the end tube 204, while the upper top wall of the slide groove 201 is formed by a portion of the lower end face of the sleeve body 203. That is, at least a portion of the lower end face of the sleeve body 203 (facing the end tube 204) is configured as the upper top wall of the slide groove 201. The purpose of this design is to ensure that before the end tube 204 is connected to the sleeve body 203, the upper part of the slide groove 201 is open, allowing the clamping member 400 and the elastic member 500 to be directly inserted into the end tube 204 from the upper opening. This makes installation and disassembly very convenient and facilitates daily cleaning and disinfection.

[0043] Since the sleeve 200 in this embodiment adopts a two-section structure of sleeve body 203 and end tube 204, how to ensure the ease of assembly and disassembly of sleeve body 203 and end tube 204 is also a problem that needs to be solved. This embodiment provides a detachable connection method for sleeve body 203 and end tube 204, as follows:

[0044] like Figures 7 to 9As shown, a slot 205 is provided on one end face of the sleeve body 203 facing the end tube 204, and the slot 205 extends axially along the sleeve body 203. An annular groove 206 is provided on the inner circumference of the sleeve body 203, and the annular groove 206 communicates with the slot 205. A locking tongue 207 is provided on the end face of the end tube 204 facing the sleeve body 203. The locking tongue 207 can pass through the slot 205 and enter the annular groove 206. When the locking tongue 207 enters the annular groove 206, the end tube 204 is rotated by a certain angle, so that the locking tongue 207 and the slot 205 are misaligned. In this way, the inner circumferential wall of the annular groove 206 can be used to restrict the locking tongue 207 from axial movement (the axial direction of the sleeve body), thereby preventing the end tube 204 from axially separating from the sleeve body 203. In this embodiment, the locking tongue 207 and the slot 205 are provided in a one-to-one correspondence. In this second embodiment, a total of two locking tongues 207 are provided.

[0045] like Figure 8 As shown, to further illustrate this solution, the following provides a detailed description of the mating relationship between the latch 207, the slot 205, and the annular groove 206. The latch 207 includes a connecting portion 208 and a latch 209. One end of the connecting portion 208 is disposed on the end face of the end tube 204, and the other end is perpendicularly connected to the latch 209. The connecting portion 208 extends axially, and the latch 209 extends radially. In some embodiments, the connecting portion 208 and the latch 207 are integrally formed.

[0046] like Figure 9 As shown in (a), when the end tube 204 needs to be assembled with the sleeve body 203, the locking tongue 207 and the slot 205 are axially aligned one-to-one. The locking tongue 207 is inserted into the slot 205 along the axial direction of the sleeve body 203. When the locking tongue 209 of the locking tongue 207 abuts against the inner wall of the annular groove 206, the end tube 204 is rotated by a certain angle, so that the locking tongue 209 and the slot 205 are circumferentially misaligned. Figure 9 As shown in (b), the inner wall of the annular groove 206 prevents the latch 209 from axially disengaging. When the latch 209 is axially aligned with the slot 205, the latch 209 can axially disengage from the annular groove 206.

[0047] In this second embodiment, one end face of the sleeve body 203 facing the end tube 204 is configured as a magnetic attraction surface, which has an attractive force. One end face of the end tube 204 facing the sleeve body 203 is also configured as a magnetic attraction surface. The two magnetic attraction surfaces of the sleeve body 203 and the end tube 204 are attached to each other, which can further ensure the stability between the sleeve body 203 and the end tube 204, and at the same time, it can also play a sealing role.

[0048] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A minimally invasive pedicle screw removal instrument, characterized in that, It includes a hand-held part (100), a sleeve (200), a push rod (300), a clamping part (400), and an elastic part (500); The sleeve (200) is disposed on the handle (100), and the handle (100) is provided with a through hole (101) communicating with the sleeve (200); the through hole (101) or the inner circumference of the sleeve (200) is provided with an internal thread; the end of the sleeve (200) away from the handle (100) is provided with a collar (600) for being fitted onto the screw connecting rod (700); The push rod (300) passes through the through hole (101) and the sleeve (200), and the push rod (300) is provided with an external thread that mates with the internal thread; Along the axial direction of the sleeve (200), the clamping member (400) is slidably disposed inside the sleeve (200), and the clamping member (400) is located between the collar (600) and the push rod (300); the elastic member (500) is disposed between the sleeve (200) and the clamping member (400).

2. The minimally invasive pedicle screw removal instrument according to claim 1, characterized in that, The top rod (300) is provided with a rotating head (301) at the end opposite to the collar (600).

3. The minimally invasive pedicle screw connector removal instrument according to claim 1, characterized in that, The clamping member (400) includes a disc (401), a guide block (402), and a top plate (403); the disc (401) is disposed inside the sleeve (200); a groove (201) is provided along the axial direction of the inner circumference of the sleeve (200); one end of the guide block (402) is disposed inside the groove (201), and the other end is connected to the disc (401); the elastic member (500) is disposed between the sleeve (200) and the guide block (402); the top plate (403) is disposed on the side of the disc (401) away from the push rod (300) and is used to clamp the screw connecting rod (700) inside the collar (600).

4. The minimally invasive pedicle screw connector removal instrument according to claim 3, characterized in that, Spring mounting grooves are provided on the inner wall of the slide (201) and on the guide block (402); the elastic element (500) is configured as a spring, with both ends of the spring respectively located in the spring mounting grooves of the sleeve (200) and the guide block (402), and the extension and retraction direction of the spring is consistent with the axial direction of the sleeve (200).

5. The minimally invasive pedicle screw removal instrument according to claim 3, characterized in that, The screw connecting rod (700) is provided with a groove (701), and the top plate (403) can be inserted into the groove (701) along the axial direction of the sleeve (200).

6. The minimally invasive pedicle screw removal instrument according to claim 5, characterized in that, The outer periphery of the push rod (300) is provided with a length scale (302) along its axial direction.

7. The minimally invasive pedicle screw extraction device according to any one of claims 3 to 6, characterized in that, The sleeve (200) includes a sleeve body (203) and an end tube (204). One end of the sleeve body (203) is disposed on the hand-held part (100), and the other end is detachably connected to the end tube (204). The push rod (300) is threadedly engaged with the sleeve body (203). The end of the end tube (204) facing away from the sleeve body is provided with the collar (600). The sliding groove (201) is disposed on the inner circumference of the end tube (204), and the clamping member (400) is slidably disposed in the end tube (204). The elastic member (500) is disposed between the end tube (204) and the clamping member (400).

8. The minimally invasive pedicle screw removal instrument according to claim 7, characterized in that, At least a portion of the end face of the sleeve body (203) is configured as the upper top wall of the groove (201).

9. The minimally invasive pedicle screw removal instrument according to claim 7, characterized in that, The end face of the sleeve body (203) facing the end tube (204) is provided with a slot (205) along its axial direction. The inner circumference of the sleeve body (203) is provided with an annular groove (206) communicating with the slot (205). The end face of the end tube (204) is provided with a locking tongue (207), which can pass through the slot (205) and rotate into the annular groove (206).

10. The minimally invasive pedicle screw removal instrument according to claim 9, characterized in that, The end face of the sleeve body (203) is magnetically attached to the end face of the end tube (204).

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