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Instrument for grafting bones in lesion vertebral body of percutaneous vertebral pedicle

A pedicle and bone grafting technology, applied in the direction of internal fixator, internal bone synthesis, fixator, etc., can solve the problems of aggravated kyphosis, loss of vertebral body, failure of internal fixation, etc.

Active Publication Date: 2021-07-06
THE THIRD HOSPITAL OF HEBEI MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thoracic and lumbar fractures are common clinically. Posterior short-segment fixed reduction has always been the mainstream method of surgical treatment. However, in the later stage, vertebral body re-loss, internal fixation failure, and kyphosis aggravation may occur. The above-mentioned situations are mainly due to During the operation, the local "eggshell-like" cavity formed after the reduction of the injured vertebrae was not filled with targeted bone graft, which made the middle and anterior column of the spine lose its structural integrity and load-bearing stability

Method used

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  • Instrument for grafting bones in lesion vertebral body of percutaneous vertebral pedicle
  • Instrument for grafting bones in lesion vertebral body of percutaneous vertebral pedicle
  • Instrument for grafting bones in lesion vertebral body of percutaneous vertebral pedicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] combine Figure 1-8 A percutaneous pedicle bone grafting instrument for diseased vertebrae includes a bone grafting mechanism and a driving mechanism for driving the bone grafting mechanism, and the bone grafting mechanism is driven by the driving mechanism to perform bone grafting to a bone defect.

[0046] The bone grafting mechanism includes a bone grafting cylinder 1, a screw rod 2 and a pusher assembly, wherein the bone grafting cylinder 1 is a hollow cylindrical structure with two ends open, and one end of the bone grafting cylinder 1 is provided with an inwardly recessed bone grafting The bin 3, the bone graft bin 3 is not connected to the hollow tube of the bone graft tube 1, and the side of the bone graft tube 1 facing the bottom of the bone graft bin 3 is provided with a sub-tube for encapsulating the screw rod 2, and the screw rod 2 passes through the bearing The seat is connected with the inner side wall of the sub-tube, the screw mandrel 2 is rotationally con...

Embodiment 2

[0054] combine Figure 9 , the drive mechanism includes an adjustment wheel 14 located at the end of the screw rod 2 away from the pusher assembly, the adjustment wheel 14 is connected to the axis of the screw rod 2 coincidently, and the outer periphery of the adjustment wheel 14 is connected by a toothed groove. The driving wheel 15 driven by the motor 16, the output shaft of the motor 16 coincides with the axis of the driving wheel 15 and is connected, the driving mechanism is sealed in the control box, and the control box is sealed and connected with the screw mandrel, A control button for driving the motor is provided, the gear is manual or electric, and a scale is provided on the outer wall of the bone grafting cylinder.

[0055] The motor of the driving mechanism drives the driving wheel to rotate, so that the adjusting wheel meshed with the driving wheel rotates to drive the rotation of the screw rod. The rotation precision of the motor drive is controllable, so that th...

Embodiment 3

[0057] combine Figure 10 , the end of the bone graft cylinder 1 away from the bone graft chamber 3 is also provided with an adjustment mechanism for adjusting the height of the bone graft cylinder 1 .

[0058] The adjustment mechanism includes a positioning rod 18 sleeved on the outer periphery of the bone graft cylinder 1 and a support rod 17 located at the upper end of the bone graft cylinder 1. The positioning rod 18 fixes the outer wall of the bone graft cylinder 1 to the In the positioning sleeve 19, the support rod 17 is connected with a fixed rod 21 for fixing the gear towards the bottom of the positioning rod 18, and the top of the positioning rod 18 is connected with a tooth rack 22 which is space-displaced with the fixed rod 21 and arranged towards the top of the support rod 17. , the fixed rod 21 and the rack 22 are connected by a gear 23, and the distance between the fixed rod 21 and the rack 22 is adjusted by the rotation of the gear 23. Between the positioning r...

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Abstract

The invention relates to an instrument for grafting bones in a lesion vertebral body of percutaneous vertebral pedicle. The instrument comprises a bone grafting mechanism and a driving mechanism used for driving the bone grafting mechanism, the bone grafting mechanism comprises a bone grafting cylinder, a lead screw and a pushing assembly, and one end of the bone grafting cylinder is provided with a bone grafting bin; the lead screw is arranged in the bone grafting cylinder and rotates relative to the bone grafting cylinder, the pushing assembly corresponds to the bone grafting bin and is connected with the lead screw, the pushing assembly comprises a screw rod connected with the lead screw, and the periphery of the screw rod is separately sleeved with a left guide block and a right guide block which are connected with the screw rod; and the left guide block and the right guide block are connected with a push plate matched with the bone grafting bin through a connecting part, and the push plate ascends and descends in the bone grafting bin through the pushing assembly. According to the instrument for grafting the bones, bone grafting materials such as bone grains in the bone grafting bin are pushed out through the pushing mechanism, and meanwhile, a collapsed end plate is pushed and reset, so that the integration of end plate resetting and bone grafting under the end plate is achieved.

Description

technical field [0001] The invention belongs to the technical field of orthopedic medical devices, and in particular relates to a percutaneous pedicle bone grafting device in diseased vertebrae. Background technique [0002] The thoracolumbar vertebral body (thorax 8 to lumbar 5) is prone to compression fractures, and the following changes will occur after vertebral body compression fractures: 1. The compression of the spinal canal by the fragmented bone can cause paralysis of the spinal cord compression limbs; 2. Loss of vertebral body height , Vertebral instability; 3. The cancellous bone of the vertebral body is compressed into a mass, and a large amount of bone pulp is lost from the fracture gap. In recent years, people have widely used pedicle internal fixation devices to treat thoracolumbar vertebral body compression fractures, and obtained excellent effects such as vertebral height recovery and firm fixation. However, due to the compression of cancellous bone into clu...

Claims

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Application Information

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IPC IPC(8): A61B17/70
CPCA61B17/7094
Inventor 孙亚澎
Owner THE THIRD HOSPITAL OF HEBEI MEDICAL UNIV
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