CN-122016150-A - Multi-point-position force measuring device and method for knee joint measuring pad

CN122016150ACN 122016150 ACN122016150 ACN 122016150ACN-122016150-A

Abstract

The invention relates to the technical field of knee joint measurement gasket test, and provides a multi-point position force measuring device and a method for a knee joint measurement gasket, wherein the test device comprises a fixed frame, an integral mechanical structure and a stacking plate structure, an upper shell of the knee joint measurement gasket is fixed in a narrow space between an upper end fixed plate and the stacking plate structure by adopting the test device, force value conduction of a plurality of measurement points of a soft upper shell is measured in the small space, the pressure loss value of the corresponding test point is obtained, the measurement precision of the measurement pad after being implanted into the knee joint is ensured through corresponding pressure loss compensation, and the unqualified measurement pad is reworked in advance or marked as a defective product, so that the measurement error caused by repeated installation of the pad with low measurement precision is avoided, and the production, installation and measurement efficiency and precision of the measurement pad are improved.

Inventors

XU ZHENYANG
CHEN DONGDONG
CHEN LIBO

Assignees

悟通感控(北京)科技有限公司
悟通感控(山东)科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A multi-point force measuring device for a knee joint measurement pad, comprising: The fixing frame comprises an upper end fixing plate, a lower end fixing plate and a plurality of supporting columns arranged between the upper end fixing plate and the lower end fixing plate; The multipoint force measuring mechanism comprises an integral mechanical structure and a stacking plate structure, wherein the integral mechanical structure comprises a total spoke force sensor and an upper pressing assembly which are arranged on the upper end fixing plate, the upper pressing assembly is used for being in contact with an upper shell of a gasket to be measured, and the total spoke force sensor is positioned between the upper pressing assembly and the upper end fixing plate and used for obtaining total pressure applied to the upper shell of the gasket to be measured; The stacking plate structure comprises a plurality of pressure detection plates, a plurality of force guide columns and a plurality of miniature spoke force sensors, wherein the miniature spoke force sensors are distributed in different pressure detection plates in a staggered manner according to preset positions, and force transmission is realized by abutting the force guide columns on preset positions of the upper shell of the to-be-detected gasket so as to realize detection of pressure at the corresponding positions of the upper shell of the to-be-detected gasket; The lifting mechanism is arranged between the lower end fixing plate and the stacking plate structure and is used for driving the stacking plate structure to lift so as to realize the installation and fixation of the upper shell of the gasket to be detected.
2. The multi-point force measuring device for a knee joint measuring pad of claim 1, wherein the stacked plate structure further comprises a force guiding column fixing plate and a bottom supporting plate, each of the pressure detecting plates is located between the force guiding column fixing plate and the bottom supporting plate, and an upper end of the force guiding column is movably sleeved on the force guiding column fixing plate for contacting with a preset position of the upper shell of the pad to be measured.
3. The multi-point force measuring device for knee joint measuring pad of claim 2, wherein said pressure sensing plates are each provided with a sensor mounting hole, said micro spoke force sensors are disposed in said sensor mounting holes, and said pressure sensing plates except for said pressure sensing plate closest to said bottom support plate are each provided with a force guiding through hole through which said force guiding column passes.
4. A multi-point force measuring device for a knee joint measuring pad as claimed in claim 3, wherein the pressure sensing plates at different levels have different sensor mounting holes, the number of layers of the pressure sensing plates and the arrangement of the sensor mounting holes being determined by the pressure acquisition point location of the upper shell of the pad to be measured and the size of the selected micro spoke force sensor.
5. The multi-point force measuring device for a knee joint measurement pad of claim 3, wherein the stacked plate structure further comprises a guide post, and guide holes are formed in the pressure detection plate, the bottom support plate and the guide post fixing plate; The upper pressing assembly is provided with guide sleeves, the guide sleeves are arranged in one-to-one correspondence with the guide posts, the guide posts sequentially penetrate through guide holes in the pressure detection plate, the bottom support plate and the guide post fixing plate, the upper ends of the guide posts are mounted in a matched mode with the guide sleeves, and the lower ends of the guide posts are connected with the bottom support plate through flanges.
6. The multi-point force measuring device for a knee joint measuring pad of claim 5, wherein a plurality of said guide holes are arranged at the periphery of said sensor mounting hole and are symmetrically disposed about said pressure detection plate.
7. The multi-point force measuring device for a knee joint measuring pad of claim 3, further comprising a connection hole and a wiring groove on said pressure sensing plate, said wiring groove for routing said miniature spoke force sensor, said connection hole for fixedly connecting all of said pressure sensing plates as a unitary structure through a connector.
8. The multi-point force measuring device for a knee joint measurement pad of claim 1, wherein the upper pressure assembly comprises an adapter plate and a profiling pressure head, the adapter plate is used for being connected with the total spoke force sensor, and the profiling pressure head is consistent with the shape of the surface to be measured of the upper shell of the pad to be measured and is used for being in direct contact with the surface to be measured of the upper shell of the pad to be measured.
9. The multi-point force measuring device for a knee joint measurement pad of claim 2, wherein the lifting mechanism is a scissor lift slip fixedly connected to the bottom support plate by a connector.
10. A multi-point force measurement method for a knee joint measurement pad, characterized in that it is based on a multi-point force measurement device for a knee joint measurement pad according to any one of claims 1 to 9, the force measurement method comprising: Controlling the lifting mechanism to descend so as to adjust the height of the stacked plate structure, thereby separating the stacked plate structure from the upper pressing assembly; placing an upper shell of a gasket to be tested at a preset position between the stacking plate structure and the upper pressing assembly; Gradually controlling the lifting mechanism to rise so as to adjust the height of the stacked plate structure, enabling the upper pressing assembly to be close to the stacked plate structure and applying preset pressure, and accordingly obtaining pressure values of the corresponding miniature spoke force sensors conducted by the force guiding columns under the preset pressure.

Description

Multi-point-position force measuring device and method for knee joint measuring pad Technical Field The invention relates to the technical field of knee joint measurement pad upper shell testing, in particular to a multi-point-position force measuring device and method for a knee joint measurement pad. Background In knee joint surgery, such as artificial knee joint replacement surgery, knee joint repair surgery, etc., accurate measurement of internal pressure of the knee joint has a critical meaning for success or failure of surgery and rehabilitation effect after operation of a patient, and therefore, the knee joint pressure measurement pad has been developed and widely used in the field of knee joint surgery. In the knee joint pressure measurement process, the pad needs to be in close contact with and fixed to the knee joint in order to accurately acquire pressure data. Therefore, related tests are required to be carried out on the test gaskets in advance before delivery, particularly multi-point force conduction tests on soft materials in a narrow space are carried out, and the problem that products cannot accurately acquire related data and therefore implantation effects are affected is avoided. Disclosure of Invention The invention aims to provide a multi-point force measuring device and method for a knee joint measuring pad, which are used for solving the multi-point force conduction test of soft materials in a narrow space, detecting element force conduction differences of sensors centralized in the narrow space, facilitating the better completion of sensor calibration and improving the accuracy of the sensors. In a first aspect, the present invention provides a multi-point force measuring device for a knee joint measurement pad, comprising: The fixing frame comprises an upper end fixing plate, a lower end fixing plate and a plurality of supporting columns arranged between the upper end fixing plate and the lower end fixing plate; The multipoint force measuring mechanism comprises an integral mechanical structure and a stacking plate structure, wherein the integral mechanical structure comprises a total spoke force sensor and an upper pressing assembly which are arranged on the upper end fixing plate, the upper pressing assembly is used for being in contact with an upper shell of a gasket to be measured, and the total spoke force sensor is positioned between the upper pressing assembly and the upper end fixing plate and used for obtaining total pressure applied to the upper shell of the gasket to be measured; The stacking plate structure comprises a plurality of pressure detection plates, a plurality of force guide columns and a plurality of miniature spoke force sensors, wherein the miniature spoke force sensors are distributed in different pressure detection plates in a staggered manner according to preset positions, and force transmission is realized by abutting the force guide columns on preset positions of the upper shell of the to-be-detected gasket so as to realize detection of pressure at the corresponding positions of the upper shell of the to-be-detected gasket; The lifting mechanism is arranged between the lower end fixing plate and the stacking plate structure and is used for driving the stacking plate structure to lift so as to realize the installation and fixation of the upper shell of the gasket to be detected. In one possible implementation manner, the stacked plate structure further comprises a force guiding column fixing plate and a bottom supporting plate, each pressure detecting plate is located between the force guiding column fixing plate and the bottom supporting plate, and the upper end of the force guiding column is movably sleeved on the force guiding column fixing plate and used for being in contact with the preset position of the upper shell of the gasket to be detected. In one possible implementation manner, the pressure detection plates are provided with sensor mounting holes, the miniature spoke force sensors are arranged in the sensor mounting holes, and the rest pressure detection plates except the pressure detection plate closest to the bottom support plate are provided with force guide through holes for the force guide columns to pass through. In one possible implementation, the pressure detection plates located at different layers have different sensor mounting holes, and the number of layers of the pressure detection plates and the arrangement of the sensor mounting holes are determined by the positions of the pressure acquisition points of the upper shell of the spacer to be detected and the size of the selected micro spoke force sensor. In one possible implementation manner, the stacking plate structure further comprises guide posts, guide holes are formed in the pressure detection plate, the bottom support plate and the guide post fixing plate, guide sleeves are arranged on the upper pressing assembly and are in one-to-one correspondence with the guide posts, t