Method and system for acquiring attitude of acetabulum and femoral head in real time during hip joint replacement procedure

• US 10,034,779 B2
• Filed: 10/08/2012
• Issued: 07/31/2018
• Est. Priority Date: 05/14/2012
• Status: Active Grant

• Current Assignee: Tsinghua University
• Original Assignee: Hong Chen
• Inventors: Chen, Hong, Wang, Zhihua, Zhou, Yixin, Su, Shaojie, Sun, Tianjia, Gao, Jiyang, Jiang, Hanjun
• Primary Examiner(s): Gibson, Eric S
• Application Number:
  US14/440,594
• Publication Number:
  US 20150289890A1
• Time in Patent Office: 2,122 Days
• CPC Class Codes: A61F 2/3609 Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts A61F2/3601 takes precedence
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30668 Means for transferring electromagnetic energy to implants
• CPC Class Codes: A61F 2002/4666 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2002/4668 for measuring angles

Abstract

A method and system for acquiring the attitudes of an acetabulum and a femoral head in real time during an artificial hip joint replacement procedure; during hip joint replacement, a pressure sensor and/or a touch sensor are disposed at each pressure point concerned for a femoral head prosthesis test mold, forming a sensor array (1); the sensor array (1) acquires the contact and stress conditions between the femoral head prosthesis test mold and the acetabulum, and sends out a signal; and a receiving terminal receives and displays the signal on a display module, and acquires the simulated attitudes of the acetabulum and the femoral head. The system comprises a sensor array (1), a necessary peripheral circuit, and a signal receiving and display device for receiving and displaying the signal sent by the peripheral circuit. The present invention can accurately simulate the presented attitude of the femoral head prosthesis during hip joint replacement procedure, so that a doctor can intuitively see the position and movement condition of the femoral head prosthesis during the procedure, thus improving the success rate and curative effect of the hip joint replacement procedure.

Claims

1. A system for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement according to a method for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement, wherein the method comprises the steps of:

disposing pressure sensors and/or touch sensors at pressure-concerning positions in the hip replacement on a femoral head template thereby forming a sensor array;

acquiring signals of interactive contacts and forces between the femoral head template and the acetabulum by the sensor array, and transmitting the signals wirelessly; and

receiving the signals by a wireless receiver and displaying the signals by a display module whereby simulating relative positions between the acetabulum and the femoral head in real time,

the system comprising;

the sensor array, the sensor array comprising a plurality of the pressure sensors and/or the touch sensors, the pressure sensors and/or the touch sensors being disposed on pressure points of interest in the hip replacement on the femoral head template;

an external circuit, being configured to process and transmit the signals acquired by the sensor array; and

a signal receiving displaying device, being configured to receive and display signals transmitted from the external circuit;

wherein the sensor array further comprises an image sensor disposed inside the femoral head template,

wherein the external circuit comprises;

a signal amplification module, being connected to an output of the sensor array and realizing amplification and digital-analog conversion of the signals from the sensors;

a first microprocessor, being connected to an output of the signal amplification module, controlling normal operation of the sensor array and the signal amplification module, conducting series/parallel processing on the digital signals of the sensors, and packing and transmitting the digital signals; and

a first wireless transceiver module, being connected to an output of the first microprocessor and sending out data; and

the signal receiving displaying device comprises;

a second wireless transceiver module for receiving the data transmitted from the first wireless transceiver module;

a second microprocessor for receiving the data from the second wireless transceiver module and processing the digital signals of the sensors into a form convenient for observation of an operator; and

a display module, being connected to the second microprocessor for displaying a processing result of the second microprocessor.

2. A system for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement according to a method for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement, wherein the method comprises the steps of:

disposing pressure sensors and/or touch sensors at pressure-concerning positions in the hip replacement on a femoral head template thereby forming a sensor array;

acquiring signals of interactive contacts and forces between the femoral head template and the acetabulum by the sensor array, and transmitting the signals wirelessly; and

receiving the signals by a wireless receiver and displaying the signals by a display module whereby simulating relative positions between the acetabulum and the femoral head in real time,

the system comprising;

the sensor array, the sensor array comprising a plurality of the pressure sensors and/or the touch sensors, the pressure sensors and/or the touch sensors being disposed on pressure points of interest in the hip replacement on the femoral head template;

an external circuit, being configured to process and transmit the signals acquired by the sensor array; and

a signal receiving displaying device, being configured to receive and display signals transmitted from the external circuit;

wherein the sensor array further comprises an image sensor disposed inside the femoral head template,

wherein the external circuit comprises;

a signal amplification module, being connected to an output of the sensor array and realizing amplification and digital-analog conversion of the signals from the sensors; and

a first microprocessor, being connected to an output of the signal amplification module, controlling normal operation of the sensor array and the signal amplification module, conducting series/parallel processing on the digital signals of the sensors, and packing and transmitting the signals; and

the signal receiving displaying device comprises;

a second microprocessor for connecting to a signal output end of the first microprocessor and processing the digital signals of the sensors into a form convenient for observation of an operator; and

a display module, being connected to the second microprocessor for displaying a processing result of the second microprocessor.

3. The system of claim 2,

wherein one end of the femoral head template is a hemispherical surface;

and

mounting holes are distributed on the hemispherical surface of the femoral head template for mounting the pressure sensors or the touch sensors and ground wires,

wherein distribution of the mounting holes on the hemispherical surface is as follows;

one of the mounting holes is disposed at a center of a top of the hemispherical surface;

downwards from the top, mounting holes are symmetrically arranged to form five circles; and

an angle between a horizontal line and a connecting line between an edge of each circle and a sphere center is 67.5°

, 52.5°

, 37.5°

, 22.5°

, and 7.5°

, respectively, from top to bottom.

4. The system of claim 2,

wherein one end of the femoral head template is a hemispherical surface;

and

mounting holes are distributed on the hemispherical surface of the femoral head template for mounting the pressure sensors or the touch sensors and ground wires,

wherein one of the pressure sensors or touch sensors is disposed in the mounting hole of the top of the hemispherical surface;

downward from the top of the hemispherical surface, a first circle is formed by eight evenly distributed mounting holes where four pressure sensors or touch sensors and four ground points are alternately disposed; and

for a second circle to a fifth circle downward from the top of the hemispherical surface, each circle is provided with twelve pressure sensors or touch sensors;

adjacent mounting holes receiving the pressure sensors or the touch sensors are spaced at a center angle of 300; and

twelve ground points are alternately arranged among the pressure sensors or the touch sensors on a fourth circle.

5. A system for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement according to a method for real-time acquiring relative positions between an acetabulum and a femoral head in hip replacement, wherein the method comprises the steps of:

disposing pressure sensors and/or touch sensors at pressure-concerning positions in the hip replacement on a femoral head template thereby forming a sensor array;

acquiring signals of interactive contacts and forces between the femoral head template and the acetabulum by the sensor array, and transmitting the signals wirelessly; and

receiving the signals by a wireless receiver and displaying the signals by a display module whereby simulating relative positions between the acetabulum and the femoral head in real time,

the system comprising;

the sensor array, the sensor array comprising a plurality of the pressure sensors and/or the touch sensors, the pressure sensors and/or the touch sensors being disposed on pressure points of interest in the hip replacement on the femoral head template;

an external circuit, being configured to process and transmit the signals acquired by the sensor array; and

a signal receiving displaying device, being configured to receive and display signals transmitted from the external circuit;

wherein the sensor array further comprises an image sensor disposed inside the femoral head template,

wherein one end of the femoral head template is a hemispherical surface; and

mounting holes are distributed on the hemispherical surface of the femoral head template for mounting the pressure sensors or the touch sensors and ground wires,

wherein a bottom part of the hemispherical surface is connected to a hollow neck region;

a plurality of contact points are distributed symmetrically on one side of the neck region; and

an auxiliary sensor is disposed at each contact point and is connected to an alarm device via the external circuit.