Medical bone screw is one of the medical devices for internal fixation of fractures, which can be made of metal materials such as stainless steel, titanium alloy, and titanium nickel memory alloy; Inorganic non-metallic materials such as alumina ceramics can also be used for production; Organic polymer materials such as polymethyl methacrylate can also be used for production. It has good biocompatibility, no toxicity when implanted in the body, and has been studied by material scientists and clinical physicians from various countries for many years. It has no significant adverse reactions to bone tissue growth and is an ideal internal fixation material for cancellous bone.

Bone screws are used for internal fixation of fractures during orthopedic surgery and are quite helpful in fracture management and reconstructive surgery. Suitable for different thread types (deep thread, full thread, half thread), different nominal diameters (HA/HB1.5-8.0mm), and different applications (cortical bone screws, cancellous bone screws, hollow screws).

The metal bone screw in and out torque tester for bone joint implants is a multifunctional composite testing device tailored to the performance requirements of metal bone screws. It can be used for testing screw rotation torque, self tapping force, axial pull-out force, torsional performance, and other bone screw related performance tests. Designed in accordance with national standards and relevant international standards, meeting the requirements of various standards, and achieving a high degree of functional concentration.

Bone screws are used for internal fixation of fractures during orthopedic surgery and are quite helpful in fracture management and reconstructive surgery. Suitable for different thread types (deep thread, full thread, half thread), different nominal diameters (HA/HB1.5-8.0mm), and different applications (cortical bone screws, cancellous bone screws, hollow screws). Screw in torque is an important parameter used to prevent screw breakage during the screwing process and ensure that doctors can easily screw in screws. The torque for screwing in should be much smaller than the torsional yield strength of the bone screw and matching screwdriver. The unscrewing torque is an important parameter used to prevent screw breakage during the unscrewing process and ensure that doctors can easily unscrew screws. The torque for unscrewing should be much smaller than the torsional yield strength achieved by the bone screw and its matching implementation.

Today, we at Puchuang mainly have a brief understanding of the self tapping force tester for this device. The reference standard for the self tapping force tester is YY/T 1506 [Test Method for Self tapping Performance of Metal Bone Screws]

Product Instrument:PBSC-RP30 bone screw performance tester

Product Introduction

PBSC-RP30 bone screw performance tester is a multifunctional integrated high-precision testing instrument developed by Puchuang Technology for medical orthopedic bone screw performance testing. It can perform related tests on bone screw driving torque, self tapping performance, pull-out force, torsional performance, and insertion force. The bone screw performance tester can be widely used in medical device testing institutions, research institutions, and medical device manufacturing enterprises.

Product Features

Open structure, user-friendly human-machine interface operation, multiple curve drawing modes, clearer testing process

Using precision differential motor drive, the transmission is smoother, the noise is lower, the positioning is more accurate, and the test results have better repeatability

Imported customized high-sensitivity load cell, imported (TBI) screw ensures precise displacement

● Professional high-performance imported control system controls coordinated action of dual servo motors

● Fully automatic measurement

● Simple and easy to operate, the highly simplified control system puts all tedious settings in the background for one click startup

Professional fixtures are suitable for different testing modes

Built in dedicated calibration program, making it easy for metrology and calibration departments (third-party) to calibrate instruments

● Support data export and Office software, combined with an optimized comprehensive data processing system

● Diversified functions, one machine implementation: pull-out performance, self power performance, rotational torque, torsional performance, insertion force

Testing process:

After starting the test, the upper fixture moves downwards at the preloading speed and applies axial force to the sample. When the force value reaches the preloading load, the rotating motor starts. When the changes in force value and torque meet the set conditions of the breakpoint ratio, it is considered that self attack has begun. After that, maintain the value of the stopping load and continue to rotate for 5 circles. The test is completed, and the maximum force during the reading process is taken as the self attack force.

Test steps:

1) Fix the prepared sample on the lower fixture and apply a suitable wrench to the upper fixture;

2) Set corresponding test parameters;

3) Fine tune the "up" or "down" position to make the axial pressure value lower than the preload, and align the specimen with the wrench. The specimen should be perpendicular to the measuring block;

4) Click the 'Start Experiment' button;