Sliding type pedicle screw for scoliosis

Abstract

The utility model discloses a sliding type pedicle screw for scoliosis, which belongs to the technical field of spinal surgeries and comprises a screw body, and the screw body comprises a lower threaded end and a screw head. The conversion screw rod comprises a hidden piece, the hidden piece comprises a connecting cylinder frame and a threaded section, the connecting cylinder frame is located between the lower threaded end and the screw head, the threaded section is installed in the connecting cylinder frame in a surrounding and penetrating mode, the end of the threaded section abuts against a supporting block, and the hidden piece is used for hiding threads between the lower threaded end and the screw head; the multiple sets of threaded pieces are arranged on the connecting cylinder frame according to needs, the length of the threaded sections can be conveniently adjusted according to needs, damage to the nerve roots is reduced, the success probability of an operation is improved, and damage to a patient is reduced.

Description

Technical Field

[0001] The utility model relates to the field of spinal surgery, in particular to a sliding pedicle screw for scoliosis. Background Art

[0002] Neurofibromatosis type 2 is an autosomal dominant genetic disease that has a high probability of causing scoliosis and is extremely difficult to treat. Currently, scoliosis caused by neurofibromatosis can be corrected surgically through three-dimensional correction technology and pedicle screw placement to correct scoliosis.

[0003] At present, the mainstream method of assisted screw placement is mainly computer navigation assisted screw placement. However, in a large number of clinical practices, it is found that computer navigation has errors such as image bias during use, which increases the risk of screw placement. Manual screw placement has a higher safety factor, but if the screw is not placed in the right position, the threads on the screw will cut the nerve root and cause nerve root damage. At the same time, poor placement can cause serious neurovascular complications. How to invent a sliding pedicle screw for scoliosis to improve these problems has become an urgent problem for technicians in this field. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a sliding pedicle screw for scoliosis, aiming to improve the problem that if the screw is not placed in a good position, the threads on the screw will cut the nerve root and cause nerve root damage.

[0005] The utility model is implemented as follows: a sliding pedicle screw for scoliosis comprises a screw body, wherein the screw body comprises a lower thread end and a screw head;

[0006] The conversion screw comprises a hidden part, which comprises a connecting barrel frame and a threaded section. The connecting barrel frame is located between the lower threaded end and the screw head. The threaded section is installed around and through the interior of the connecting barrel frame. A support block is provided at the end of the threaded section.

[0007] In a preferred technical solution of the utility model, a groove is provided at one end of the lower thread end close to the screw head, and the middle part of the screw head is penetrated.

[0008] In a preferred technical solution of the present utility model, the hidden part also includes a connecting rod, one end of which is limitedly connected to the support block, the connecting rod is located on the inner wall of the screw head, the connecting tube frame is sleeved on the outside of the support block, and the threaded section is limitedly slidably installed around the connecting tube frame.

[0009] In a preferred technical solution of the utility model, the support block is set as a truncated cone, the end of the support block close to the connecting tube frame is the lower end, the outer edge of the support block close to the connecting tube frame is chamfered, and the support block is located inside the threaded segment and abuts against the threaded segment.

[0010] In a preferred technical solution of the present utility model, the threaded segment includes a threaded piece and a limiting slider, both ends of the threaded piece are fixedly connected to the limiting slider, at least two groups of threaded pieces are provided, each group of threaded pieces is provided with four threaded pieces, and through holes corresponding to the threaded pieces are opened on the connecting cylinder frame, and the threaded piece cooperates with the limiting slider to slide in the through holes around the connecting cylinder frame.

[0011] In a preferred technical solution of the present utility model, a spring is provided on one side of the limiting sliding block close to the outside of the connecting cylinder frame.

[0012] In a preferred technical solution of the utility model, the middle part of the support block is hollow, one end of the connecting rod passes through the support block, one end of the connecting rod is rotatably connected to a ring plate, and the ring plate is rotatably connected to the bottom of the support block.

[0013] In a preferred technical solution of the utility model, the inner wall of the connecting tube frame is seamlessly connected to the inner wall of the screw head, and a threaded ring is fixedly sleeved on the middle part of the connecting rod, and the threaded ring is threadedly connected to the inside of one end of the connecting tube frame close to the screw head and the inside of the screw head.

[0014] In a preferred technical solution of the utility model, one end of the connecting rod close to the screw head end is fixedly connected to the adjusting head, a through hole is opened at the bottom of the bolt groove of the screw head end, and the adjusting head is located inside the bolt groove of the screw head.

[0015] The beneficial effects of the utility model are as follows: the utility model obtains a sliding pedicle screw for scoliosis through the above-mentioned design. When in use, the threaded section will retract into the interior of the connecting tube frame. At this time, no thread will appear on the upper side, reducing damage to the nerve root. At the same time, if the thread of the lower threaded end is not enough, replace the screwdriver and rotate the adjusting head inside the screw head. At this time, the adjusting head drives the threaded ring to rotate in the screw head. The threaded ring and the screw head thread drive the support block to rise. At this time, the support block will squeeze the threaded piece at the bottom of the connecting tube frame to move outward, which is convenient for continued placement of the screw body. At the same time, multiple groups of threaded pieces are arranged on the connecting tube frame according to needs, which is convenient for adjusting the length of the threaded section according to needs, reducing damage to the nerve root, improving the probability of successful surgery, and reducing damage to patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the combined structure provided by the implementation mode of the utility model;

[0018] Figure 2 A schematic diagram of the internal structure provided for an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the decomposed structure provided for an implementation mode of the utility model;

[0020] Figure 4 This is a schematic diagram of the hidden part splitting structure provided in an embodiment of the utility model.

[0021] In the figure: 100-screw body; 110-lower threaded end; 120-screw head; 200-converter screw; 210-hidden part; 211-connecting cylinder frame; 212-threaded section; 2121-threaded sheet; 2122-limiting slider; 213-support block; 214-ring plate; 215-connecting rod; 216-adjusting head; 217-threaded ring. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1 and Figure 2 The utility model provides a technical solution: a sliding pedicle screw for scoliosis, comprising

[0024] The screw body 100 includes a lower threaded end 110 and a screw head 120; the conversion screw rod 200 includes a hidden part 210, and the hidden part 210 includes a connecting cylinder frame 211 and a threaded segment 212. The connecting cylinder frame 211 is located between the lower threaded end 110 and the screw head 120. The threaded segment 212 is installed around and through the interior of the connecting cylinder frame 211. The end of the threaded segment 212 is abutted with a support block 213. The hidden part 210 is used to hide the thread between the lower threaded end 110 and the screw head 120 to reduce the damage of the thread to the nerve root.

[0025] See also Figure 2 and Figure 3 A groove is provided at one end of the lower thread end 110 close to the screw head 120, and the middle part of the screw head 120 is penetrated.

[0026] See also Figures 2 to 4 The hidden part 210 further includes a connecting rod 215, one end of which is limitedly connected to a support block 213, the connecting rod 215 is located on the inner wall of the screw head 120, the connecting cylinder frame 211 is sleeved with the outside of the support block 213, and the threaded section 212 is limitedly slidably installed around the connecting cylinder frame 211. The support block 213 is a truncated cone, the end of the support block 213 close to the connecting cylinder frame 211 is the lower end, the outer edge of the support block 213 close to the end of the connecting cylinder frame 211 is a chamfered setting, the support block 213 is located inside the threaded section 212 and abuts against the threaded section 212, and when the support block 213 moves toward one end of the screw head 120, the threaded section 212 is spread open, so that the threaded section 212 corresponds to the thread of the lower threaded end 110, which is convenient for continued adjustment.

[0027] The threaded segment 212 includes a threaded piece 2121 and a limiting slider 2122. Both ends of the threaded piece 2121 are fixedly connected to the limiting slider 2122. There are at least two groups of threaded pieces 2121, and each group of threaded pieces 2121 is provided with four. The connecting cylinder frame 211 is provided with through holes corresponding to the threaded pieces 2121. The threaded piece 2121 cooperates with the limiting slider 2122 to slide in the through holes around the connecting cylinder frame 211. Multiple groups are convenient for adjustment according to needs, so that the parts that do not need threaded connection are hidden inside the connecting cylinder frame 211. A spring is provided on one side of the limiting slider 2122 close to the outside of the connecting cylinder frame 211, and the threaded piece 2121 slides in the connecting cylinder frame 211. At the same time, the limiting slider 2122 limits the sliding position of the threaded piece 2121 to prevent the threaded piece 2121 from falling off. At the same time, the spring is used to squeeze the threaded piece 2121 to move toward the inside of the connecting cylinder frame 211. When the support block 213 is not squeezed, the threaded piece 2121 can be easily retracted into the connecting cylinder frame 211.

[0028] The middle part of the support block 213 is hollow, one end of the connecting rod 215 passes through the support block 213, one end of the connecting rod 215 is connected to the ring plate 214 for limited rotation, and the ring plate 214 is connected to the bottom of the support block 213 for limited rotation. The inner wall of the connecting cylinder frame 211 is seamlessly connected to the inner wall of the screw head 120, and the middle part of the connecting rod 215 is fixedly sleeved with a threaded ring 217, which is threadedly connected inside the end of the connecting cylinder frame 211 near the screw head 120 and inside the screw head 120. One end of the connecting rod 215 near the end of the screw head 120 is fixedly connected to the adjustment head 216, and a through hole is provided at the bottom of the bolt groove at the end of the screw head 120. The adjustment head 216 is located inside the bolt groove of the screw head 120. The adjustment head 216 is rotated to pull the support block 213 upward to squeeze the multiple thread segments 212, so as to facilitate the expansion of the thread segments 212 for threaded installation.

[0029] Working principle: when the screw body 100 is inserted, the threaded section 212 will retract into the inside of the connecting tube frame 211. At this time, no thread will appear on the top, reducing damage to the nerve root. At the same time, if the thread of the lower threaded end 110 is not enough, replace the screwdriver and rotate the adjusting head 216 inside the screw head 120. At this time, the adjusting head 216 drives the threaded ring 217 to rotate in the screw head 120. The threaded transmission of the threaded ring 217 and the screw head 120 drives the support block 213 to rise. At this time, the support block 213 will squeeze the threaded piece 2121 at the bottom of the connecting tube frame 211 to move outward, which is convenient for the continued insertion of the screw body 100. At the same time, multiple groups of threaded pieces 2121 are set on the connecting tube frame 211 as needed, which is convenient for adjusting the length of the threaded section 212 as needed to reduce damage to the nerve root.

[0030] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sliding pedicle screw for scoliosis, characterized in that: include A screw body, the screw body comprising a lower threaded end and a screw head; The conversion screw comprises a hidden part, which comprises a connecting barrel frame and a threaded section. The connecting barrel frame is located between the lower threaded end and the screw head. The threaded section is installed around and through the interior of the connecting barrel frame. A support block is provided at the end of the threaded section.

2. A sliding pedicle screw for scoliosis as claimed in claim 1, characterized in that: A groove is provided at one end of the lower thread end close to the screw head, and the middle part of the screw head is penetrated.

3. A sliding pedicle screw for scoliosis as claimed in claim 2, characterized in that: The hidden part also includes a connecting rod, one end of which is limitedly connected to the support block, the connecting rod is located on the inner wall of the screw head, the connecting tube frame is sleeved on the outside of the support block, and the threaded section is limitedly slidably installed around the connecting tube frame.

4. A sliding pedicle screw for scoliosis as claimed in claim 3, characterized in that: The support block is configured as a truncated cone, the end of the support block close to the connecting cylinder frame is the lower end, the outer edge of the support block close to the end of the connecting cylinder frame is chamfered, and the support block is located inside the threaded segment and abuts against the threaded segment.

5. A sliding pedicle screw for scoliosis as claimed in claim 4, characterized in that: The threaded segment includes a threaded piece and a limiting slider. Both ends of the threaded piece are fixedly connected to the limiting slider. There are at least two groups of threaded pieces, and each group of threaded pieces is provided with four threaded pieces. The connecting cylinder frame is provided with through holes corresponding to the threaded pieces. The threaded pieces cooperate with the limiting slider to slide in the through holes around the connecting cylinder frame.

6. A sliding pedicle screw for scoliosis as claimed in claim 5, characterized in that: A spring is arranged on one side of the limiting sliding block close to the outside of the connecting cylinder frame.

7. The sliding pedicle screw for scoliosis according to claim 4, characterized in that: The middle part of the support block is hollow, one end of the connecting rod passes through the support block, one end of the connecting rod is connected to a ring plate in a limited rotation manner, and the ring plate is connected to the bottom of the support block in a limited rotation manner.

8. The sliding pedicle screw for scoliosis according to claim 7, characterized in that: The inner wall of the connecting cylinder frame is seamlessly connected to the inner wall of the screw head. A threaded ring is fixedly sleeved on the middle part of the connecting rod. The threaded ring is threadedly connected inside the end of the connecting cylinder frame close to the screw head and inside the screw head.

9. The sliding pedicle screw for scoliosis according to claim 8, characterized in that: One end of the connecting rod close to the end of the screw head is fixedly connected to the adjusting head, a through hole is opened at the bottom of the bolt groove of the end of the screw head, and the adjusting head is located inside the bolt groove of the screw head.

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