High-strength self-supporting type locking screw driver
A self-sustaining, high-strength technology, applied in the direction of the fixer, etc., can solve the problems of manufacturing difficulties, bead and spring installation difficulties, and easy wear and tear, and achieve the effect of low cost and simple replacement
Active Publication Date: 2015-08-12
SHANDONG WEIGAO ORTHOPEDIC DEVICE COMPANY
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Problems solved by technology
The tapered connector has very high precision requirements on the screw plug and the connector itself. It is difficult to manufacture, and it is prone to wear after long-term use. Due to uneven force, the self-breaking part of the screw plug is easy to get stuck on the connector after a large torque is applied. superior
The scheme of spring and touch bead is relatively easier to manufacture, but it has certain requirements on the size and shape of the connector. Generally, it can only be used for hexagon socket plugs larger than SW4.0 specifications; for plum blossom-shaped self-breaking screw plugs, Due to the small diameter of the inscribed circle of the quincunx, the installation of the bead and the spring is very difficult
Method used
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[0022] Such as image 3 , Figure 4 , Image 6 , Figure 7 A high-strength self-sustaining locking screwdriver as shown is provided with an operating rod 7, and the lower end of the operating rod 7 is provided with a connecting hole in the same shape as the connecting hole and plugged into a connecting hole in the middle of the locking self-breaking seat with a hexagonal or plum blossom shape. The connecting head 8, the lower end of the connecting head 8 is provided with a spacer 11 whose diameter is smaller than the dismounting hole on the screw plug body, the spacer can rotate freely in the dismounting hole, and the outer circumference of the connecting head 8 and the spacer 11 are evenly distributed with at least Two shrapnel installation grooves, the upper end of the shrapnel installation groove is installed with a self-holding shrapnel 10 whose upper end bounces outward and the lower end is fixedly connected with the short-avoiding head. The upper end of the self-holdin...
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Provided is a high-strength self-supporting type locking screw driver. The high-strength self-supporting type locking screw driver is provided with an operating rod. The lower end of the operating rod is provided with a connector. The lower end of the connector is provided with a space avoiding head, wherein the diameter of the space avoiding head is smaller than the diameter of a disassembling hole. The outer circumferences of the connector and the space avoiding head are evenly provided at least two spring sheet installing grooves respectively. Self-supporting spring sheets are arranged inside the spring sheet installing grooves, wherein the upper ends of the self-supporting spring sheets are bounced outwards, and the lower ends of the self-supporting spring sheets are fixedly connected with the space avoiding head. The upper ends of the self-supporting spring sheets are arranged inside the spring sheet installing grooves in the connector. The upper ends of the self-supporting spring sheets protrude out of the outer wall of the connector in the radial direction. The high-strength self-supporting type locking screw driver has the advantages of being simple in structure, low in volume and high in strength.
Description
technical field [0001] The invention relates to the technical field of medical instruments for orthopedic surgery, and in particular relates to a high-strength self-sustaining locking screwdriver with small volume, high strength and long service life. Background technique [0002] Locking driver is a tool commonly used in orthopedic surgery, its role is to fasten the nut or screw plug to the screw seat or the steel plate. Due to the requirement of small size and high strength, it is one of the difficulties in the design of orthopedic instruments. A lockdriver for pedicle screws is used to screw the plug into the screw seat and fasten the connecting rod to the screw seat. In order to tighten the screw plug safely and reliably, the locking torque generally needs to reach a relatively high value. Usually, the locking torque of the screw-rod system used in the posterior thoracolumbar segment requires about 10-12Nm. The common method of precisely controlling the locking torque ...
Claims
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IPC IPC(8): A61B17/92
CPCA61B17/92A61B2017/922
Inventor 卢明邬春晖倪斌高亚军于朝亮寇万福
Owner SHANDONG WEIGAO ORTHOPEDIC DEVICE COMPANY