Operating system of distractable fusion cage for endoscopic rear bone grafting

Abstract

The utility model provides an operation system of a distractable fusion cage for post-endoscopic bone grafting, which comprises a fusion cage and a holder, the fusion cage comprises a main body, a blade assembly and a pushing assembly, the pushing assembly comprises a first U-shaped base, the holder further comprises an outer sleeve, an inner sleeve and a connecting piece, the fusion cage is fixed at the far end of the holder, and the outer sleeve is fixed at the far end of the holder. The pushing assembly further comprises a threaded rod connected with the first U-shaped base, a first inner threaded hole is formed in the side, close to the holder, of the threaded rod, the pushing assembly further comprises a screwdriver assembly, the screwdriver assembly comprises a screwdriver rod and a screwdriver knob part, the screwdriver rod is arranged in the inner sleeve in a sliding and penetrating mode, and the screwdriver knob part is arranged in the screwdriver rod. A first external thread is arranged at the far end of the screwdriver rod, the first external thread is in threaded connection with the first internal threaded hole, and the screwdriver knob piece is fixed to the near end of the screwdriver rod. The fusion cage is opened through the screw driver in threaded fit with the fusion cage, so that the screw driver and the fusion cage are aligned quickly and accurately.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments for posterior bone grafting surgery, in particular to an operating system for a posterior bone grafting fusion device that can be expanded under a microscope. Background Art

[0002] In existing endoscopic posterior bone grafting surgeries, the posterior bone graft often needs to be expanded, and a fusion device and a corresponding fusion device injector are required.

[0003] Regarding the fusion device, the Chinese invention patent with publication number CN113509295A (hereinafter referred to as the existing patent 1) discloses a fusion device with adjustable height of post-bone grafting, which discloses a pushing assembly including a first U-shaped base and a threaded rod fixed to the first U-shaped base, the threaded section of the threaded rod extending out of the end face of the first U-shaped base, the square cylindrical section of the threaded rod passing through the first U-shaped base and extending out of an end face of the first U-shaped base away from the threaded section, by using a matching tool to match the threaded rod, the threaded rod is driven to rotate so that the threaded rod is displaced in the threaded through hole, thereby driving the first U-shaped base to move in a straight line direction, so that the blade assembly moves toward each other in a vertical direction, and the fusion device is expanded. In the existing patent 1, the threaded rod blocks the center position of the fusion device, resulting in the inability to fill bone blocks through the center position of the fusion device during surgery, and only bone mud can be filled, resulting in slow fusion, and even easy dislocation, causing the patient to need a second surgical revision.

[0004] Regarding the fusion device, the Chinese invention patent with publication number CN116269950A (hereinafter referred to as the existing patent 2) discloses a fusion device holder with adjustable height under a microscope, which discloses an inner sleeve and an outer sleeve, wherein the inner sleeve and the outer sleeve are connected by inner and outer threads, that is, during use, the inner sleeve and the outer sleeve are relatively immovable by thread connection, the outer sleeve is provided with two elastic clips, the inner sleeve is provided with a fusion device fixing thread, and the fusion device is clamped by the fusion device fixing thread and the two elastic clips, and it is also disclosed that when the fusion device is opened, in addition to the fusion device holder in the existing patent 2, a square wrench is required to be used to twist the threaded rod on the fusion device, wherein the square wrench is inserted into the inner hole of the inner sleeve and needs to be matched with the square cylindrical section of the threaded rod. During the operation, since the square wrench will be separated from the square cylindrical section of the threaded rod, it is necessary to align the square wrench with the square cylindrical section of the threaded rod many times during the operation, which makes the operation difficult and requires more instruments. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an operating system for opening a fusion device after bone grafting under a microscope, so as to open the fusion device through a screwdriver which cooperates with the fusion device in a threaded connection manner, so as to enable the screwdriver and the fusion device to be aligned quickly and accurately.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A posterior bone grafting and expandable fusion device operating system under microscope comprises a fusion device and a holder, wherein the fusion device comprises a main body, a blade assembly embedded with the main body, and a pushing assembly embedded with the blade assembly, wherein the pushing assembly comprises a first U-shaped base, the holder comprises a distal end and a proximal end, the holder further comprises an outer sleeve, an inner sleeve sleeved inside the outer sleeve, and a connecting piece that fixes the proximal end of the inner sleeve to the proximal end of the outer sleeve, the fusion device is fixed at the distal end of the holder, the pushing assembly further comprises a threaded rod connected to the first U-shaped base, the threaded rod is provided with a first internal threaded hole on a side close to the holder, and further comprises a screwdriver assembly, the screwdriver assembly comprises a screwdriver rod and a screwdriver knob, the screwdriver rod is slidably inserted into the inner sleeve, the distal end of the screwdriver rod is provided with a first external thread, the first external thread is screwed to the first internal threaded hole, the screwdriver knob is fixed to the proximal end of the screwdriver rod and is located on the outside of the proximal end of the connecting piece.

[0008] Furthermore, the screwdriver assembly also includes a screwdriver outer ring, which is a circular tubular structure with a proximal end sealed, and the distal end of the screwdriver outer ring is detachably connected to the proximal end of the connecting piece. A first through hole is provided at the proximal center of the screwdriver outer ring, and the screwdriver rod is slidably inserted into the first through hole.

[0009] Furthermore, two cylindrical protrusions extend symmetrically from the distal inner side surface of the screwdriver outer ring, and an L-shaped groove is symmetrically opened on the proximal outer side surface of the connecting piece. The cylindrical protrusion first extends axially into the L-shaped groove, and then is clamped in the L-shaped groove after radial rotation, thereby realizing a detachable connection between the screwdriver outer ring and the connecting piece.

[0010] Furthermore, the screwdriver assembly also includes a screwdriver inner ring, which is a circular tubular structure with a sealed far end. The screwdriver inner ring is slidably inserted into the inner hole of the screwdriver outer ring. A fixing hole is provided at the far end center of the screwdriver inner ring, and the screwdriver rod is fixedly arranged in the fixing hole.

[0011] Furthermore, the screwdriver assembly also includes a spring, wherein the spring is sleeved on the screwdriver rod, and the spring is located between the screwdriver outer ring and the screwdriver inner ring.

[0012] Furthermore, a second through hole is provided at the center of the threaded rod.

[0013] Furthermore, it also includes a guide needle, the screwdriver rod is a tubular structure, and the guide needle is slidably inserted into the inner hole of the screwdriver rod and the second through hole.

[0014] Furthermore, a second external thread is provided at the distal end of the inner sleeve, a second internal thread hole is provided at the end of the main body close to the holder, and the second external thread is threadedly connected to the second internal thread hole.

[0015] Furthermore, two symmetrical clips are provided at the distal end of the outer sleeve, and the two clips clamp two opposite side surfaces of the main body.

[0016] Furthermore, the distal end of the connecting piece is fixedly connected to the proximal end of the inner sleeve, and the distal end of the connecting piece is threadedly connected to the proximal end of the outer sleeve.

[0017] The beneficial effect of the utility model is that by making the screwdriver and the fusion device cooperate in a threaded connection, the fusion device and the screwdriver are not easily separated during the operation, so that the position of the fusion device can be quickly found and the fusion device can be quickly screwed during the operation, thereby improving the accuracy of the surgical operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the operating system of the fusion device that can be expanded by endoscopic posterior bone grafting according to an embodiment of the utility model;

[0019] Figure 2 For the utility model embodiment Figure 1 DD section view;

[0020] Figure 3 For the utility model embodiment Figure 2 A partial enlarged view of;

[0021] Figure 4 For the utility model embodiment Figure 2 B is a partial enlarged view;

[0022] Figure 5 It is a front cross-sectional view of the operating system of the posterior bone graft expandable fusion device with a guide pin in an embodiment of the utility model;

[0023] Figure 6 For the utility model embodiment Figure 5 A partial enlarged view of C;

[0024] Figure 7 This is a cross-sectional view of the fusion device after being expanded according to the embodiment of the utility model.

[0025] Description of labels:

[0026] 1. Fusion device; 2. Holder; 3. Screwdriver assembly; 4. Guide pin;

[0027] 11. Main body; 12. Blade assembly; 13. Push assembly;

[0028] 21. outer sleeve; 22. inner sleeve; 23. connector;

[0029] 31. Screwdriver rod; 32. Screwdriver knob; 33. Screwdriver outer ring; 34. Screwdriver inner ring; 35. Spring;

[0030] 111. second internal threaded hole;

[0031] 131, first U-shaped base; 132, threaded rod; 1321, first internal threaded hole; 1322, second through hole;

[0032] 211, clip;

[0033] 221, second external thread;

[0034] 231, L-shaped groove;

[0035] 311, first external thread;

[0036] 331, first perforation; 332, cylindrical protrusion;

[0037] 341.Fixing hole. DETAILED DESCRIPTION

[0038] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0039] Please refer to Figures 1 to 7 , the embodiments provided by the utility model are:

[0040] A posterior bone grafting and expandable fusion device operating system under an endoscope comprises a fusion device 1 and a holder 2, wherein the fusion device 1 comprises a main body 11, a blade assembly 12 engaged with the main body 11, and a pushing assembly 13 engaged with the blade assembly 12, wherein the pushing assembly 13 comprises a first U-shaped base 131, and the holder 2 comprises a distal end and a proximal end, wherein the holder 2 further comprises an outer sleeve 21, an inner sleeve 22 sleeved inside the outer sleeve 21, and a connecting piece 23 fixedly connecting the proximal end of the inner sleeve 22 to the proximal end of the outer sleeve 21, and the fusion device 1 is fixed at the distal end of the holder 2.

[0041] Furthermore, the pushing assembly 13 further comprises a threaded rod 132 connected to the first U-shaped base 131, and the blade assembly 12 can be opened by twisting the threaded rod 132. The threaded rod 132 is provided with a first internal threaded hole 1321 on a side close to the holder 2, and further comprises a screwdriver assembly 3, the screwdriver assembly 3 comprises a screwdriver rod 31 and a screwdriver knob 32, the screwdriver rod 31 is slidably inserted into the inner sleeve 22, a first external thread 311 is provided at the distal end of the screwdriver rod 31, the first external thread 311 is screwed with the first internal threaded hole 1321, and the screwdriver knob 32 is fixed to the proximal end of the screwdriver rod 31 and is located outside the proximal end of the connecting member 23. The first external thread 311 at the distal end of the screwdriver rod 31 cooperates with the first internal threaded hole 1321 at the proximal end of the threaded rod 132, so that during the surgical operation, the screwdriver rod 31 is not easily separated from the threaded rod 132 after cooperation, and the threaded rod 132 can be screwed into place more quickly and accurately. Specifically, during operation, the screwdriver rod 31 is operated by manually twisting the screwdriver knob 32 connected to the proximal end of the screwdriver rod 31 , thereby operating the threaded rod 132 , which is convenient to operate.

[0042] Furthermore, the screwdriver assembly 3 also includes a screwdriver outer ring 33, which is a circular tubular structure with a proximal end sealed. The distal end of the screwdriver outer ring 33 is detachably connected to the proximal end of the connecting member 23. A first through hole 331 is provided at the proximal center of the screwdriver outer ring 33. The screwdriver rod 31 is slidably penetrated into the first through hole 331. At this time, the first through hole 331 is coaxially arranged with the threaded rod 132, and the first internal threaded hole 1321 is arranged at the center position of the threaded rod 132, that is, the first through hole 331 is coaxially arranged with the first internal threaded hole 1321. The position of the screwdriver rod 31 is limited by the screwdriver outer ring 33 fixed on the connecting member 23, so that the screwdriver rod 31 is always in a coaxial position with the threaded rod 132, which facilitates and quickly aligns the screwdriver rod 31 with the threaded rod 132, thereby improving the accuracy of surgical operations.

[0043] Furthermore, two cylindrical protrusions 332 are symmetrically extended from the distal inner side surface of the screwdriver outer ring 33, and an L-shaped groove 231 is symmetrically opened on the proximal outer side surface of the connecting piece 23. The cylindrical protrusion 332 first extends axially into the L-shaped groove 231, and then is clamped in the L-shaped groove 231 after radial rotation, thereby realizing a detachable connection between the screwdriver outer ring 33 and the connecting piece 23. This connection method is easy to operate.

[0044] Furthermore, the screwdriver assembly 3 further includes a screwdriver inner ring 34, which is a circular tubular structure with a sealed distal end, and is slidably inserted into the inner hole of the screwdriver outer ring 33. A fixing hole 341 is provided at the distal center of the screwdriver inner ring 34, and the screwdriver rod 31 is fixedly arranged in the fixing hole 341. In this structure, the screwdriver inner ring 34 is fixedly connected to the screwdriver rod 31, and the screwdriver inner ring 34 slidably arranged with the screwdriver outer ring 33 makes the horizontal sliding of the screwdriver rod 31 more stable, and the operation accuracy of the surgical process is higher.

[0045] Furthermore, the screwdriver assembly 3 further includes a spring 35, which is sleeved on the screwdriver rod 31 and is located between the screwdriver outer ring 33 and the screwdriver inner ring 34. The spring 35 allows the distal end of the screwdriver rod 31 to always abut against the first internal threaded hole 1321 of the threaded rod 132, further improving the speed and accuracy of the surgical operation.

[0046] Furthermore, a second through hole 1322 is provided at the center of the threaded rod 132, and the second through hole 1322 is provided for inserting bone blocks and bone mud conveniently. Specifically, the inner diameter of the first internal thread hole 1321 is greater than or equal to the diameter of the second through hole 1322, so that the first internal thread hole 1321 does not affect the surgical operation space.

[0047] For details, please refer to Figure 6 , and also includes a guide pin 4. The screw rod 31 is a tubular structure. The guide pin 4 is slidably inserted into the inner hole of the screw rod 31 and the second through hole 1322. The bone block and bone mud are inserted through the guide pin 4, so that the fusion device 1 can be expanded and the bone block and bone mud can be inserted through one instrument, which not only saves the number of medical instruments, but also improves the structural strength of the fusion device 1 after being expanded, thereby improving the success rate of the operation.

[0048] Furthermore, a second external thread 221 is provided at the distal end of the inner sleeve 22 , and a second internal thread hole 111 is provided at the end of the main body 11 close to the holder 2 , and the second external thread 221 is threadedly connected with the second internal thread hole 111 .

[0049] Furthermore, two symmetrical clips 211 are provided at the distal end of the outer sleeve 21 , and the two clips 211 clamp two opposite side surfaces of the main body 11 to clamp and position the fusion device 1 .

[0050] Further, the distal end of the connector 23 is fixedly connected to the proximal end of the inner sleeve 22, and the distal end of the connector 23 is threadedly connected to the proximal end of the outer sleeve 21. The proximal end of the inner sleeve 22 and the proximal end of the outer sleeve 21 are connected through the connector 23.

[0051] The endoscopic posterior bone grafting system of the present application can expand the fusion device operating system. The specific surgical operation process is: fix the fusion device 1 to the distal end of the holder 2, and install the screwdriver assembly 3 at the proximal end of the holder 2. At this time, under the action of the spring 35, the distal end of the screwdriver rod 31 contacts the first internal threaded hole 1321 of the threaded rod 132; then, extend the distal ends of the fusion device 1 and the holder 2 into the human tissue, and place the fusion device 1 at a suitable position; next, turn the screwdriver knob 32 by hand, and the distal end of the screwdriver is screwed into the first internal threaded hole 1321 of the threaded rod 132, The screwdriver drives the threaded rod 132 to move, thereby driving the blade assembly 12 to expand, thereby expanding the fusion device 1; according to actual needs, the bone blocks and bone mud are inserted into the human tissue through the guide needle 4. When filled to the appropriate position, the screwdriver knob 32 is turned to separate the screwdriver knob 32 from the threaded rod 132, and the screwdriver outer ring 33 is disassembled and separated from the connecting piece 23, and then the bone blocks and bone mud are continued to be filled through the guide needle 4 until the filling is completed. At this time, the distal end of the fusion device 1 is sealed with an end cover, the holder 2 is separated from the fusion device 1, and the holder 2 is moved to the outside of the human body.

[0052] In summary, the endoscopic posterior bone grafting provided by the present invention can expand the fusion device operating system, and its beneficial effects are:

[0053] 1. The screwdriver rod 31 is connected to the threaded rod 132 on the fusion device 1 by means of threads, and the screwdriver rod 31 is not easily separated from the threaded rod 132, thereby improving the accuracy of the surgical operation process;

[0054] 2. The screwdriver assembly 3 ensures the speed, accuracy and convenience of connection between the screwdriver and the threaded rod 132;

[0055] 3. A second through hole 1322 is provided on the threaded rod 132, so that the guide pin 4 can be used to directly insert bone blocks and bone mud when the gripper 2, the screwdriver assembly 3 and the fusion device 1 are combined and connected. The operation is convenient and fewer surgical instruments are used, which greatly improves the success rate of the operation and greatly reduces the possibility of a second operation.

[0056] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A posterior bone grafting expandable fusion device operating system under endoscopic microscope, comprising a fusion device (1) and a holder (2), wherein the fusion device (1) comprises a main body (11), a blade assembly (12) engaged with the main body (11), and a pushing assembly (13) engaged with the blade assembly (12), wherein the pushing assembly (13) comprises a first U-shaped base (131), and the holder (2) comprises a distal end and a proximal end, and the holder (2) further comprises an outer sleeve (21), an inner sleeve (22) sleeved inside the outer sleeve (21), and a connecting member (23) fixedly connecting the proximal end of the inner sleeve (22) to the proximal end of the outer sleeve (21), wherein the fusion device (1) is fixed at the distal end of the holder (2), and characterized in that: The pushing assembly (13) further comprises a threaded rod (132) connected to the first U-shaped base (131), the threaded rod (132) being provided with a first internal threaded hole (1321) on a side close to the holder (2), and a screwdriver assembly (3), the screwdriver assembly (3) comprising a screwdriver rod (31) and a screwdriver knob (32), the screwdriver rod (31) being slidably inserted into the inner sleeve (22), the distal end of the screwdriver rod (31) being provided with a first external thread (311), the first external thread (311) being threadedly connected to the first internal threaded hole (1321), the screwdriver knob (32) being fixed to the proximal end of the screwdriver rod (31) and being located outside the proximal end of the connecting member (23).

2. The endoscopic posterior bone graft expandable fusion device operating system according to claim 1, characterized in that: The screwdriver assembly (3) further comprises a screwdriver outer ring (33), wherein the screwdriver outer ring (33) is a circular tubular structure with a proximal end sealed, wherein the distal end of the screwdriver outer ring (33) is detachably connected to the proximal end of the connecting member (23), and a first through hole (331) is provided at the proximal center of the screwdriver outer ring (33), and the screwdriver rod (31) is slidably inserted into the first through hole (331).

3. The endoscopic posterior bone graft expandable fusion device operating system according to claim 2, characterized in that: The distal inner side surface of the screwdriver outer ring (33) is symmetrically extended with two cylindrical protrusions (332), and the proximal outer side surface of the connecting piece (23) is symmetrically opened with an L-shaped groove (231). The cylindrical protrusion (332) firstly extends axially into the L-shaped groove (231), and then is radially rotated and clamped in the L-shaped groove (231), thereby realizing a detachable connection between the screwdriver outer ring (33) and the connecting piece (23).

4. The endoscopic posterior bone graft expandable fusion device operating system according to claim 2 or 3, characterized in that: The screwdriver assembly (3) further comprises a screwdriver inner ring (34), which is a circular tubular structure with a sealed distal end. The screwdriver inner ring (34) is slidably inserted into the inner hole of the screwdriver outer ring (33), and a fixing hole (341) is provided at the distal center of the screwdriver inner ring (34). The screwdriver rod (31) is fixedly arranged in the fixing hole (341).

5. The endoscopic posterior bone graft expandable fusion device operating system according to claim 4, characterized in that: The screwdriver assembly (3) further comprises a spring (35), wherein the spring (35) is sleeved on the screwdriver rod (31), and the spring (35) is located between the screwdriver outer ring (33) and the screwdriver inner ring (34).

6. The endoscopic posterior bone graft expandable fusion device operating system according to claim 1, characterized in that: A second through hole (1322) is provided at the center of the threaded rod (132).

7. The endoscopic posterior bone graft expandable fusion device operating system according to claim 6, characterized in that: It also includes a guide needle (4), the screwdriver rod (31) is a tubular structure, and the guide needle (4) is slidably inserted into the inner hole of the screwdriver rod (31) and the second through hole (1322).

8. The endoscopic posterior bone graft expandable fusion device operating system according to claim 1, characterized in that: The distal end of the inner sleeve (22) is provided with a second external thread (221), the end of the main body (11) close to the holder (2) is provided with a second internal thread hole (111), and the second external thread (221) is threadedly connected with the second internal thread hole (111).

9. The endoscopic posterior bone graft expandable fusion device operating system according to claim 1, characterized in that: The distal end of the outer sleeve (21) is provided with two symmetrical clamping pieces (211), and the two clamping pieces (211) clamp two opposite side surfaces of the main body (11).

10. The endoscopic posterior bone graft expandable fusion device operating system according to claim 1, characterized in that: The distal end of the connecting piece (23) is fixedly connected to the proximal end of the inner sleeve (22), and the distal end of the connecting piece (23) is threadedly connected to the proximal end of the outer sleeve (21).

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