CN218128709U

CN218128709U - Auxiliary device for implanting vertebral pedicle screws of vertebral column

Info

Publication number: CN218128709U
Application number: CN202221730697.4U
Authority: CN
Inventors: 郑冰; 史建刚; 王元
Original assignee: Shanghai Changzheng Hospital
Current assignee: Shanghai Changzheng Hospital
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-12-27
Anticipated expiration: 2032-07-07

Abstract

The utility model belongs to the field of medical health, concretely relates to auxiliary device that backbone pedicle of vertebral arch screw was implanted. The device consists of a cortical bone mouth gag, an elastic open circuit system and a power system. The cortical bone mouth gag is positioned according to anatomy, and is opened at the screw feeding point of the pedicle screw to break open the cortical bone. Under the rotary power that driving system provided, elasticity system of opening a way can advance in the cancellous bone self-tapping in the pedicle of vertebral arch, and the self-tapping head end is blunt first elastic construction, when meetting the great cortical bone of hardness relatively, elasticity system of opening a way can deflect back in the cancellous bone structure by oneself, guarantees the implantation safety of pedicle of vertebral arch screw. The utility model has the advantages of simple and reasonable structure, maneuverability is strong, can be fine be applied to pedicle of vertebral arch screw in the implantation operation, and do not increase surgeon's work load, have good application prospect.

Description

Auxiliary device for implanting vertebral pedicle screws of vertebral column

Technical Field

The utility model belongs to the medical health field, concretely relates to auxiliary device that backbone pedicle of vertebral arch screw was implanted.

Background

The pedicle screw belongs to an orthopedic internal fixation system, namely, the internal fixation screw is implanted into a front vertebral body from the rear of the pedicle and has stronger fixation effect on the whole vertebral column after being connected by a titanium alloy rod. The pedicle screw internal fixation system is widely applied to the treatment process of spinal trauma, congenital spinal deformity and degenerative spinal diseases at present, and is a basic means for the surgical treatment of spinal diseases at present.

In the current clinical treatment, the implantation technology of pedicle screws is mainly divided into two main categories, namely, freehand implantation and computer-aided implantation. The bare-handed nail implantation technology depends on the anatomical structure of the pedicle of vertebral arch to determine the implantation point, and the implantation of the internal fixing screw is carried out according to the preoperative image and intraoperative fluoroscopy. The technology has the advantages of high nail-planting speed and less ray exposure in the operation, but has larger error rate of nail-planting, and the internal fixation in the operation fails to be implanted and adjusted, thereby possibly bringing serious health hazard to patients. The computer-aided nail implanting technology has high nail implanting accuracy, but has the defects of complicated operation, prolonged operation time, large ray exposure of an operator and a patient and the like.

Disclosure of Invention

An object of the utility model is to provide an auxiliary pedicle screw bare-handed nail planting technique improves the auxiliary device that backbone pedicle screw implanted of bare-handed nail planting technical accuracy.

The utility model provides an auxiliary device that spinal pedicle of vertebral arch screw was implanted comprises elasticity system of opening a way 1, driving system 2 and cortex bone mouth gag 3, wherein: one end of the elastic open circuit system 1 is clamped on the power system 2, and the power system 2 provides rotary power; elasticity system of opening a way 1 is formed by dead lever 4, elastic rod 5 and tap head 6 connecting gradually, tap head 6 is round blunt head, can avoid getting into the cortex bone when ensureing the tap, the diameter of elastic rod 5 is less than the diameter of dead lever 4, tap head 6, elastic rod 5, be the rounding off between the 4 three of dead lever, ensure that elasticity system of opening a way during operation local stress is too concentrated, cause elasticity system of opening a way fracture, cortex bone mouth gag 3 is used for breaking open the cortex bone.

In the utility model, the cortical bone mouth gag 3 and the power system 2 are conventional surgical instruments which are successfully applied to clinic at present.

In the utility model, the fixing rod 4, the elastic rod 5 and the tapping head 6 are all formed integrally by nickel-titanium alloy.

The utility model discloses the theory of operation as follows:

in the vertebral body, the density and hardness of the bone structure are not uniform, the outer part of the bone structure is cortical bone, the inner part of the bone structure is cancellous bone, the hardness of the cortical bone is higher, the density is higher, and the hardness of the cancellous bone is lower and the density is lower. In the process of implanting the pedicle screw, the pedicle screw needs to be in the cancellous bone in the whole process, and in the process of implanting the screw, if the tap head 6 always advances and is in the cancellous bone, the tap can smoothly advance due to the small hardness of the cancellous bone; if the front end of the screw tap head 6 vertically touches the cortical bone, the front end of the screw tap head is round and blunt, so that the screw tap head cannot penetrate the cortical bone, and the safety of the implanted nail is ensured; if the tapping head 6 obliquely touches the joint of the cancellous bone and the cortical bone, the tapping head 6 can automatically deflect in the direction to avoid the cortical bone and continuously advance in the cancellous bone because the elastic rod 5 is made of nickel-titanium high-elasticity alloy, so that the safety of the pedicle screw implantation is ensured.

The beneficial effects of the utility model reside in that:

the utility model discloses under the rotary power that driving system provided, elasticity open a way the system can advance in the spongy bone in the pedicle of vertebral arch self tapping, and the self tapping head end be blunt first elastic structure, when meetting the relatively great cortical bone of hardness, elasticity open a way the system can deflect back in the spongy bone structure by oneself, guarantees pedicle of vertebral arch screw's implantation safety. The utility model has the advantages of simple and reasonable structure, maneuverability is strong, and the implantation operation of being applied to pedicle of vertebral arch screw that the ability is fine, and does not increase surgeon's work load, has good application prospect.

Drawings

FIG. 1 is a general view of the apparatus of the present invention;

FIG. 2 is a block diagram of a flexible open circuit system;

FIG. 3 is a schematic view of the working principle of the present invention;

reference numbers in the figures: 1 is an elastic open-circuit system; 2 is a power system; 3 is a cortical bone mouth gag; 4 is a fixed rod, 5 is an elastic rod; and 6, a screw tap head.

Detailed Description

The present invention will be further described with reference to the following examples and drawings.

Example 1: as shown in figures 1, 2 and 3, the device is composed of a cortical bone mouth gag, an elastic open circuit system and a power system (as shown in figure 1), wherein the cortical bone mouth gag 3 and the power system 2 are conventional surgical instruments which are successfully applied to clinic at present. The elastic open circuit system 1 can be clamped on the power system 2, and the power system 2 provides rotary power. The utility model discloses in, elasticity system of opening a way 1 comprises tap head 6, elastic rod 5, 4 triplexes of dead lever, and its triplex is nickel titanium alloy integrated into one piece, and tap head 6 is round blunt head, can avoid getting into the cortex bone when ensureing the tap, and the diameter of elastic rod 5 is less than the diameter of dead lever 4, and is slick and sly excessive between tap head 6, elastic rod 5, the dead lever 4 three, ensures that elasticity system of opening a way during operation local stress is too concentrated, causes elasticity system of opening a way fracture.

The working process of the utility model is as follows

The patient lies in the operating table in the prone position after anesthesia, the bilateral vertebral plates and part of articular processes are exposed in the conventional posterior approach, and the pedicle screw feeding point is determined according to the herringbone ridge and the transverse process upper edge of the pedicle screw. The cortical bone opener 3 breaks open the cortical bone, the elastic open circuit system 1 is fixed on the power system 2, the front edge of the elastic open circuit system 1 is propped against the broken cortical bone, and pressure is slightly applied. And (3) opening the power system 2, and then seeing that the elastic road opener 1 rotates, wherein the self-tapping head at the front end of the elastic road opener 1 enters into cancellous bone in the vertebral pedicle and advances gradually along with the rotation. When the front end of the elastic opening device 1 touches the cortical bone, the elastic opening device 1 can deflect automatically and continue to advance along the cancellous bone until the target depth as the hardness of the cortical bone is higher than that of the cancellous bone. And after the ball probe checks that the open screw channel is correct, the pedicle screws are screwed in along the open screw channel, and the pedicle screw implantation is finished.

Claims

1. The utility model provides an auxiliary device that pedicle of vertebral arch screw was implanted, comprises elasticity open circuit system (1), driving system (2) and cortex bone mouth gag (3), its characterized in that: one end of the elastic open circuit system (1) is clamped on the power system (2), and the power system (2) provides rotary power; elasticity system of opening a way (1) is by dead lever (4), elastic rod (5) and tap head (6) connect gradually and form, tap head (6) are round blunt head, can avoid getting into the cortex bone when ensureing the tap, the diameter of elastic rod (5) is less than the diameter of dead lever (4), tap head (6), elastic rod (5), be the rounding off between dead lever (4) the three, it too concentrates to ensure the local stress of elasticity system of opening a way during operation, cause the elasticity system of opening a way fracture, cortex bone mouth gag (3) are used for breaking open the cortex bone.

2. The auxiliary device for pedicle screw implantation of vertebral columns according to claim 1, wherein: the fixing rod (4), the elastic rod (5) and the tap head (6) are all formed by nickel-titanium alloy in one piece.