A gripper and a gripping method

Abstract

The present application relates to intervertebral fusion holder medical instrument technology field, specifically speaking, a kind of holder and holding method, the holder includes screw rod, inner sleeve, outer sleeve, knob, locking block, the front end of the outer sleeve is equipped with with the inner support block of fusion ware middle clamping connector, the outer sleeve is equipped with inner sleeve, inner sleeve and outer sleeve sliding do not rotate connection, inner sleeve rear end stretches out outer sleeve and is connected with knob screw, the rear end surface of inner sleeve is equipped with fixed tooth, screw rod is inserted into inner sleeve, the front end of screw rod stretches out outer sleeve, the rear end of screw rod stretches out inner sleeve and is equipped with locking block, the front end surface of the locking block is equipped with with the locking tooth of fixed tooth meshing, by the assembly of holder, fixed inner support block, fixed outer expansion block, locking, inner support block advance, disengage, bone grafting etc. Step is used, with simple structure, holding effect is good, holding operation is simple, and it has advantages such as improving bone grafting efficiency.

Description

Technical Field

[0001] This invention relates to the field of medical device technology for holding interbody fusion devices, specifically a holding device and holding method that is simple in structure, has good holding effect, is easy to operate, and improves bone grafting efficiency. Background Technology

[0002] As is well known, spinal degenerative changes are common in orthopedic clinics, including intervertebral disc degeneration, spinal stenosis, spondylolisthesis, and compression of the spinal cord or nerve roots. Surgical treatment is often necessary to completely relieve the compression, restore the physiological curvature of the spine, and ensure spinal stability. Other patients with spinal deformities, trauma, tumors, those undergoing revision surgery, and those with infections may also require interbody fusion to stabilize the lumbar segments. Interbody fusion devices are effective for these spinal diseases, are simple to operate, convenient to use, have a high fusion rate, and do not have the complications associated with bone grafting fusion. They are now widely used in clinical practice.

[0003] Existing interbody fusion cages are used in conjunction with a reamer. Interbody fusion cages typically consist of an internal support block and an external expansion block. During reaming, the reamer moves the internal support block via a threaded rotation to achieve the expansion function. Initially, the internal support block and external expansion block are connected. The reamer moves the internal support block by rotating its handle, thus achieving expansion. Because the internal support block and external expansion block are initially connected, the expansion effect is poor. If the internal support block and external expansion block were disconnected, the expansion space could be increased, ensuring a better expansion effect. However, there is no suitable reamer to achieve this expansion effect. Furthermore, existing reamers only perform the expansion function and do not have bone grafting capabilities. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple, effective, and convenient bone grafting device and method that improves bone grafting efficiency.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A gripper, characterized in that the gripper includes a screw, an inner sleeve, an outer sleeve, a knob, and a locking block. The front end of the outer sleeve is provided with a snap-fit ​​connector that engages with an inner support block in a fusion device. The inner sleeve is provided inside the outer sleeve, and the inner sleeve and the outer sleeve are slidably connected without rotation. The rear end of the inner sleeve extends out of the outer sleeve and is threadedly connected to the knob. The rear end face of the inner sleeve is provided with a fixing tooth. The screw is inserted into the inner sleeve, the front end of the screw extends out of the outer sleeve, and the rear end of the screw extends out of the inner sleeve and is provided with a locking block. The front end face of the locking block is provided with a locking tooth that engages with the fixing tooth. The screw, inner sleeve, and outer sleeve are locked without rotation by the engagement of the locking tooth with the fixing tooth.

[0007] The screw of the present invention has at least two ball grooves along the screw axis at its rear end. The locking block has a ball mounting hole, and a ball, a spring and a sealing cover are provided in the ball mounting hole. The ball is connected to the sealing cover by the spring and the sealing cover is fixed on the ball mounting hole.

[0008] The screw of the present invention is provided with a guide profile, and the locking block is provided with a guide groove surface that cooperates with the guide profile. The screw can slide without rotating within the locking block through the cooperation of the guide profile and the guide groove surface.

[0009] The screw of the present invention has an interface at its rear end that is connected and mated with a quick-change handle, and the screw is connected to the quick-change handle through the interface.

[0010] The snap-fit ​​connector at the front end of the outer tube of the present invention includes at least two snap-fit ​​springs. The snap-fit ​​springs are distributed in the circumferential direction of the end of the outer tube. The rear end of the snap-fit ​​springs is connected to the outer tube. The outer side of the front end of the snap-fit ​​springs is provided with a protruding snap-fit ​​head. The snap-fit ​​of the inner support block is realized by the cooperation between the snap-fit ​​head and the snap-fit ​​springs.

[0011] A method for holding a gripper, characterized by the following steps:

[0012] (1) Assembly of the gripper: Insert the screw in the gripper into the inner sleeve, insert the inner sleeve into the outer sleeve, install a knob at the rear of the inner sleeve, and install a locking block at the rear of the screw; connect the rear end of the screw to the handle;

[0013] (2) Fix the inner support block: Attach the snap-fit ​​connector at the front end of the outer tube of the holder to the inner support block;

[0014] (3) Fix the outer expansion block: Insert the front end of the screw into the outer expansion block and fix it to the thread at the front end of the outer expansion block. Then, align the inner support block with the outer expansion block by rotating the outer sleeve and the inner sleeve.

[0015] (4) Locking: After alignment in step (3), push the locking block toward the front of the screw so that the locking teeth on the locking block mesh with the fixing teeth at the rear end of the inner sleeve, thereby locking the screw to the inner sleeve and the outer sleeve so that they cannot rotate relative to each other;

[0016] (5) Inner support block advance: Rotate the knob, the knob moves forward along the inner sleeve, the knob pushes the outer sleeve, the outer sleeve pushes the inner support block forward, and then pushes the inner support block into the outer extension block;

[0017] (6) Disengagement: Rotate the screw in the opposite direction to separate the screw from the outer expansion block and pull out the screw. At this time, the inner sleeve is hollow and bone grafting can be performed on the fusion device through the inner cavity of the inner sleeve.

[0018] The present invention, due to the above-mentioned structure, has the advantages of simple structure, good holding effect, convenient holding operation, and improved bone grafting efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the mounting inner support block and the outer expansion block of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the present invention without the inner support block and the outer expansion block installed.

[0021] Figure 3 This is a schematic diagram of the screw's structure.

[0022] Figure 4 This is a schematic diagram of the locking block.

[0023] Figure 5 This is a schematic diagram of the inner sleeve.

[0024] Figure 6 This is a schematic diagram of the outer tube structure. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] As shown in the attached figure, a gripper is characterized in that the gripper includes a screw 1, an inner sleeve 2, an outer sleeve 3, a knob 4, and a locking block 5. The front end of the outer sleeve 3 is provided with a snap-fit ​​connector that engages with the inner support block 16 in the fusion device. The inner sleeve 2 is provided inside the outer sleeve 3. The inner sleeve 2 and the outer sleeve 3 are slidably connected without rotation. The rear end of the inner sleeve 2 extends out of the outer sleeve 3 and is threadedly connected to the knob 4. The rear end face of the inner sleeve 2 is provided with a fixing tooth 6. The screw 1 is inserted into the inner sleeve 2. The front end of the screw 1 extends out of the outer sleeve 3. The rear end of the screw 1 extends out of the inner sleeve 2 and is provided with a locking block 5. The front end face of the locking block 5 is provided with a locking tooth 7 that engages with the fixing tooth 6. The screw 1, the inner sleeve 2, and the outer sleeve 3 are locked without rotation by the engagement of the locking tooth 7 with the fixing tooth 6.

[0027] Furthermore, the rear end of the screw 1 is provided with at least two ball grooves 8 along the axis of the screw 1, and the locking block 5 is provided with a ball mounting hole 9. The ball mounting hole 9 is provided with a ball, a spring and a sealing cover. The ball is connected to the sealing cover by the spring and the sealing cover is fixed on the ball mounting hole 9.

[0028] Furthermore, the screw 1 is provided with a guide profile 10, and the locking block 5 is provided with a guide groove surface 11 that cooperates with the guide profile 10. The screw 1 can slide without rotating within the locking block 5 through the cooperation of the guide profile 10 and the guide groove surface 11.

[0029] Furthermore, the rear end of the screw 1 is provided with an interface 12 that connects and mates with the quick-change handle, and the screw 1 is connected to the quick-change handle 15 through the interface 12.

[0030] Furthermore, the snap-fit ​​connector at the front end of the outer sleeve 3 includes at least two snap-fit ​​springs 13. The snap-fit ​​springs 13 are distributed in the circumferential direction at the end of the outer sleeve 3. The rear end of the snap-fit ​​springs 13 is connected to the outer sleeve 3. The outer side of the front end of the snap-fit ​​springs 13 is provided with a protruding snap-fit ​​protrusion 14. The snap-fit ​​of the inner support block 16 is realized by the cooperation between the snap-fit ​​protrusion 14 and the snap-fit ​​springs 13. After the screw is inserted, the snap-fit ​​springs can be opened and snapped into the groove on the outer expansion block. After the screw is pulled out, they can be retracted inward, disengaged from the groove, and pulled out.

[0031] The steps of the holding method of the holder of the present invention are as follows:

[0032] (1) Assembly of the gripper: Insert the screw 1 in the gripper into the inner sleeve 2, insert the inner sleeve 2 into the outer sleeve 3, install the knob 4 at the rear of the inner sleeve 2, and install the locking block 5 at the rear of the screw 1; connect the rear end of the screw 1 to the handle 15.

[0033] (2) Fix the inner support block 16: Attach the snap-fit ​​connector at the front end of the outer sleeve 3 of the holder to the inner support block 16;

[0034] (3) Fix the outer expansion block: Insert the front end of the screw 1 into the outer expansion block and fix it to the thread at the front end of the outer expansion block 17. Then, align the inner support block 16 with the outer expansion block 17 by rotating the outer sleeve 3 and the inner sleeve 2.

[0035] (4) Locking: After alignment in step (3), push the locking block 5 toward the front of the screw 1 so that the locking teeth 7 on the locking block 5 and the fixing teeth 6 at the rear end of the inner sleeve 2 engage, thereby locking the screw 1 to the inner sleeve 2 and the outer sleeve 3 so that they cannot rotate relative to each other.

[0036] (5) Inner support block 16 advances: Rotate knob 4, knob 4 moves forward along inner sleeve 2, knob 4 pushes outer sleeve 3, outer sleeve 3 pushes inner support block 16 forward, and then pushes inner support block 16 into outer extension block 17;

[0037] (6) Disconnection: Rotate screw 1 in the opposite direction to separate screw 1 from outer expansion block 17 and pull out screw 1. At this time, inner sleeve 2 is in a hollow state, and bone grafting can be performed on the fusion device through the inner cavity of inner sleeve 2.

[0038] The specific implementation process is as follows: The screw 1 is provided with a threaded gripping outer expansion block 17 at its front end, and a recess and a flat rotation limiting structure at its rear end that cooperate with the ball in the locking block 5. The screw 1 is also provided with an interface 12 that cooperates with the quick-change handle 15.

[0039] The inner sleeve 2 has a D-shaped shape at the front end that can fit with the D-shaped inner hole of the outer sleeve 3. The inner sleeve 2 has an external thread that fits with the knob 4. The rear end face of the inner sleeve 2 has a fixing tooth 6 that meshes with the locking tooth 7 on the front end face of the locking block 5.

[0040] The outer sleeve 3 has a snap-fit ​​connector at the front end, which can hold the inner support block 16. The D-shaped hole of the outer sleeve 3 matches the D-shaped shape of the inner sleeve 2, so that the inner and outer sleeves 3 can move back and forth, but cannot rotate independently, but can only rotate together.

[0041] The locking block 5 is equipped with a ball, which can cooperate with the ball groove 8 on the screw 1 for front and rear positioning. The locking block 5 has a flat inner hole that cooperates with the screw 1 to limit rotation.

[0042] The knob 4 has an internal thread that can engage with the external thread of the inner sleeve 2. When rotated, the outer sleeve 3 can be pushed forward.

[0043] In use, first insert the snap-fit ​​connector of the outer sleeve 3 into the inner support block 16 to hold the inner support block 16. Then, use the screw 1 to tighten the screw thread on the outer expansion block 17. At this time, the outer sleeve 3 can be rotated to adjust whether the direction of the inner support block 16 is aligned with the cavity direction of the outer expansion block (before the locking block 5 and the fixing teeth 6 of the inner sleeve 2 are engaged, the inner and outer sleeves 3 can rotate relative to the screw 1 simultaneously. Because the inner and outer sleeves 3 are flat-shaped, they can only move back and forth and cannot rotate relative to each other). After alignment, Locking block 5 is pushed forward from the rear ball groove 8 of screw 1 to the front ball groove 8, so that locking block 5 engages with the fixing tooth 6 of inner sleeve 2, thereby locking screw 1 and inner and outer sleeves 3 so that they cannot rotate relative to each other. Rotating knob 4, knob 4 pushes outer sleeve 3 forward along the thread of inner sleeve 2, thereby pushing outer sleeve 3 with inner support block 16 into outer expansion block 17. Rotating screw 1 in the opposite direction separates screw 1 from outer expansion block 17. Screw 1 is pulled out, inner sleeve 2 is in a hollow state, and bone grafting can be performed on expandable fusion device through hollow hole.

[0044] The holder of this invention needs to hold the inner support block 16 and the outer expansion block 17 in the fusion device separately. After entering the human body, it is pushed and combined over a long distance to ensure passage through a small-diameter channel. The outer expansion block 17 is held by the screw 1, and the inner support block 16 is held by the outer sleeve 3. The outer sleeve 3 and the inner sleeve 2 are engaged by a D-shaped hole. Its advantages are: ① the position of the outer expansion block 17 and the inner support block 16 can be corrected and adjusted by rotating the inner sleeve 2; ② after alignment, the inner sleeve 2 can be toothed and locked by the push locking block 5, thereby locking the position of the outer expansion block 17 and the inner support block 16. The knob 4 is threadedly engaged with the inner sleeve 2. The inner sleeve 2 can be pushed by rotating the knob 4. The cannula 2 moves the inner support block 16 relative to the screw 1 to allow the inner support block 16 to be inserted into the outer expansion block 17. After the implant assembly is completed, the screw 1 and the inner cannula 2 and other components can be pulled out, leaving only the outer cannula 3 holding the inner support block 16. Bone grafting can be performed on the fusion device through the outer cannula 3. The holder of this patent pushes the inner push block into the outer expansion block. Its clamping method is simple. The outer expansion block is directly clamped by the inner expansion of the screw or the snap-fit ​​protrusion of the arc-shaped spring, ensuring the stability of the structure. No additional parts are needed for passive clamping. Due to the above structure, this invention has the advantages of simple structure, stability after expansion, high strength after expansion, and easy implantation.

Claims

1. A gripper, characterized in that... The holder includes a screw, an inner sleeve, an outer sleeve, a knob, and a locking block. The front end of the outer sleeve has a snap-fit ​​connector that engages with the inner support block in the fusion unit. The inner sleeve is housed inside the outer sleeve, and the inner sleeve and outer sleeve are slidably connected without rotation. The rear end of the inner sleeve extends out of the outer sleeve and is threadedly connected to the knob. The rear end face of the inner sleeve has fixing teeth. The screw is inserted into the inner sleeve, with its front end extending out of the outer sleeve and its rear end extending out of the inner sleeve and having a locking block. The front end face of the locking block has locking teeth that mesh with the fixing teeth. The engagement of the locking teeth with the fixing teeth achieves a non-rotational locking of the screw, inner sleeve, and outer sleeve. The rear end of the screw has at least two ball grooves along the screw axis, and the locking block has ball mounting holes. The ball mounting hole contains a ball, a spring, and a sealing cap. The ball is connected to the sealing cap via the spring, and the sealing cap is fixed to the ball mounting hole. The screw has a guide profile, and the locking block has a guide groove that mates with the guide profile. The screw slides within the locking block without rotating due to the engagement of the guide profile and the guide groove. The rear end of the screw has an interface for connecting to the quick-change handle. The screw is connected to the quick-change handle through the interface. The snap-fit ​​connector at the front end of the outer tube includes at least two snap-fit ​​springs distributed circumferentially at the end of the outer tube. The rear end of the snap-fit ​​springs is connected to the outer tube, and the outer side of the front end of the snap-fit ​​springs has a protruding snap-fit ​​head. The snap-fit ​​head engages with the snap-fit ​​springs to secure the inner support block.

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