WO2023075069A1

WO2023075069A1 - Joint motion measurement system

Info

Publication number: WO2023075069A1
Application number: PCT/KR2022/008829
Authority: WO
Inventors: 한민우; 강민채; 이혜원; 이주희
Original assignee: 동국대학교 산학협력단
Priority date: 2021-10-26
Filing date: 2022-06-22
Publication date: 2023-05-04
Also published as: KR20230059908A

Abstract

A joint motion measurement system according to an embodiment of the present invention may comprise: a plurality of artificial bones which form artificial joints to simulate joints of a patient; a force measurement jig in which the artificial bones are installed and fixed and which operates the artificial bones to simulate the joint motion of the patient; a force measurement unit which measures a force applied to the artificial joints when the force measurement jig is operated; and a joint evaluation unit which evaluates the condition of cartilage tissue of the joints of the patient by analyzing an amount of change in the force measured by the force measurement unit.

Description

Joint motion measurement system

The present invention relates to a joint motion measurement system, and more particularly, to a joint that can efficiently analyze and evaluate damage to cartilage tissue of a patient's joint by operating an artificial joint that simulates the joint of a patient with knee disease as a jig. It is about a motion measurement system.

In general, cartilage tissue in the knee joint plays an important role in allowing the knee to perform normal motion. However, due to the structural characteristics of the cartilage tissue of the knee joint, wear occurs over time. Various knee diseases have occurred according to the abrasion of the cartilage tissue as described above.

In addition, since total joint arthroplasty varies depending on the degree of damage to cartilage tissue and ligaments, whether or not to operate and how to operate, it is very important to determine the degree of damage to the cartilage and ligaments of the patient.

To this end, a system for measuring joint motion under various conditions of the knee joint is required, and recently, methods for determining the degree of damage to cartilage tissue or ligaments through CT or MRI have been used. However, the method using CT or MRI only grasps the current state of the knee joint, and it is impossible to analyze and evaluate damage to cartilage tissue and ligaments caused by forces acting on the joint during movement of the knee joint.

Therefore, various techniques and methods are being researched and developed to determine the degree of damage to the patient's cartilage tissue and ligaments by the force acting on the knee joint during movement of the knee joint.

In particular, the method of directly installing the measurement system on the patient's knee joint not only gives the patient a burden for surgery, but also adversely affects the cartilage tissue and ligaments of the knee joint due to the measurement system installed inside the knee joint. There are problems that can be given.

In addition, there are cases in which a measurement system is installed on an artificial joint to determine the state of the artificial joint after total arthroplasty, but this is for acquiring data for structurally adjusting the balance of the artificial joint. Therefore, it has nothing to do with data acquisition for total joint arthroplasty and has nothing to do with analyzing and evaluating the patient's actual knee joint.

Related prior art documents include Korean Patent Registration No. 10-2285833 (Title of Invention: Smart Sensor System for Knee Artificial Joint Surgery, Registration Date: 2021.07.29), and Korean Patent Publication No. 10-2020-0104525 (Title of Invention) : Knee joint pressure measurement device, publication date: 2020.09.04).

In an embodiment of the present invention, after manufacturing an artificial joint that simulates the joint of a patient with knee disease, the artificial joint is operated as a jig to measure the amount of change in force acting on the patient's knee joint while copying the patient's joint motion, , To provide a joint motion measurement system that can efficiently determine the damage to the patient's cartilage tissue using this.

In addition, the embodiment of the present invention simulates the patient's knee joint using an artificial joint and a jig, so that cartilage and ligament damage caused by the patient's joint motion can be easily measured without performing a separate measurement system on the patient's knee joint. A joint motion measurement system capable of analyzing and evaluating is provided.

According to one embodiment of the present invention, a plurality of artificial bones forming an artificial joint for simulating a joint of a patient, a force measuring jig in which the artificial bones are installed and fixed, and which operates the artificial bones to simulate the joint motion of the patient , a force measuring unit that measures the force applied to the artificial joint when the force measuring jig is operated, and a joint that evaluates the condition of the cartilage tissue of the patient's joint by analyzing the amount of change in the force measured by the force measuring unit A joint motion measurement system including an evaluation unit is provided.

Preferably, the artificial bones include a first artificial bone provided in a shape corresponding to a first bone forming a joint of the patient, and a first artificial bone provided in a shape corresponding to a second bone forming a joint with the first bone. 2 May be provided as artificial bone.

Preferably, the force measuring jig includes a first jig to which the first artificial bone is fixed, an artificial artificial bone rotatably connected to the first jig, and the first artificial bone and the second artificial bone simulating the joint of the patient. A second jig to which the second artificial bone is fixed to form a joint, and a second jig disposed at a connection portion between the second jig and the first jig and centered on a connection portion between the first jig and the second jig. and a jig driving unit that rotates to simulate joint motions of the first artificial bone and the second artificial bone.

Preferably, the first artificial bone includes a first artificial bone body formed the same as the first bone, and a first cartilage formed of a softer material than the first artificial bone body at a joint portion of the first artificial bone body. can include In addition, the second artificial bone includes a second artificial bone body formed identically to the second bone, and a second cartilage formed of a material softer than the second artificial bone body at a joint portion of the second artificial bone body. can do.

Preferably, the force measuring unit is disposed at a joint of the first artificial bone and the second artificial bone to measure a force applied to the joint during a joint motion of the first artificial bone and the second artificial bone. It can be.

For example, the force measurement unit may measure the amount of change in force applied to the first cartilage and the second cartilage during a joint motion of the first artificial bone and the second artificial bone, so as to measure the amount of change in the first cartilage or the second artificial bone. It may include a load cell disposed inside at least one of the two cartilages. In this case, the load cell may be disposed to be embedded between the first artificial bone body and the first cartilage, or may be disposed to be embedded between the second artificial bone body and the second cartilage.

Unlike the above, artificial ligaments may be connected to the first artificial bone body and the second artificial bone body. The force measuring unit may include a load cell connected to the artificial ligament to measure a change amount of force acting on the artificial ligament during a joint motion between the first artificial bone and the second artificial bone. At this time, the load cell may be disposed at a position spaced apart from the force measurement jig, and the artificial ligament may be extended toward the load cell and connected to the load cell.

Preferably, the first jig may be seated and fixed to the bottom surface, and the lower end of the second jig may be rotatably connected to the upper end of the first jig. Here, the jig driving unit may include a driving motor mounted on an upper end of the first jig such that a rotating shaft is connected to a lower end of the second jig.

The first jig includes a base member seated on the bottom surface and fixed to the center of an upper surface portion of the opposite side of the joint portion of the first artificial bone, and disposed on both sides of the upper surface portion of the base member, respectively, and the upper surface portion of the base member. It may include a first link member elongated in the vertical direction.

The second jig is disposed above the first link member, and the opposite side of the joint of the second artificial bone is fixed to the center of the lower surface so that the joint of the first artificial bone and the second artificial bone come into contact with each other. a top member, and a second link member disposed on both sides of the lower surface of the top member, extending in a vertical direction from the lower surface of the top member and rotatably connected to the first link member.

Here, bone fixing parts for fixing the first artificial bone and the second artificial bone may be respectively formed on the base member and the top member. In particular, in at least one of the base member and the top member, the bone fixing parts may be provided at a plurality of positions to change the fixing positions of the first artificial bone and the second artificial bone according to the joint shape of the patient. can

Further, in the first link member and the second link member, the first link member and the second link member are configured to change a distance between the first artificial bone and the second artificial bone according to the joint shape of the patient. A plurality of link connection parts for adjusting the connection length may be formed, respectively.

In the passive muscle support robot having a function of supporting transfer of a heavy object according to an embodiment of the present invention, the second and third holders move according to the user's movement, store elastic force in the passive muscle support device, and then move the passive muscle support device. Since it is a structure that provides elastic force to the arm supporter to assist in the transfer of heavy objects, the manual muscle support robot can be used to effectively support the user's arm strength during heavy object transfer work, and after the user lifts the heavy object with little force, It can be easily and smoothly transported to the desired location. Therefore, in the present embodiment, it is possible to efficiently assist the user in transporting the heavy object while wearing the manual muscle support robot, thereby increasing work efficiency during the transporting task of the heavy object, and reducing the weight that is difficult for the user to lift. Even heavy objects can be transported smoothly.

In addition, the passive muscle support robot having a function of supporting the transfer of heavy objects according to an embodiment of the present invention receives the elastic force of the passive muscle strength support device through the arm muscle support wire connected to the third mounting portion and is caught on the handle portion of the heavy object. Since it is a structure provided to the arm strength support unit, the elastic force of the passive muscle strength support device is provided to the handle part of the weight in the direction of lifting the weight, so the user can reduce the amount of force for lifting the weight, and in that state, the user A heavy object can be easily transported to a desired location. Therefore, in the present embodiment, the transfer support function of the passive muscle support robot can be used only with a simple task of lifting the weight by hooking the arm strength support unit of the arm strength support device to the handle of the weight during the heavy object transfer operation.

In addition, since the passive muscle support robot having a function of supporting transfer of heavy objects according to an embodiment of the present invention has a structure in which the arm support device includes an arm support wire, a wearing unit, and an arm support unit, the arm support device has a simple structure. and can be manufactured at low cost, and can be smoothly applied to various types of passive muscle support robots.

In addition, the manual muscle strength support robot having a function of supporting the transfer of heavy objects according to an embodiment of the present invention can easily adjust the length of the arm muscle strength support wire using the wire length adjusting unit of the arm muscle support unit during heavy object transfer work, Through this, by adjusting the length of the arm strength support device to suit the user's arm length, users with various body types can use the arm strength support device smoothly.

In addition, in the passive muscle support robot having a function of supporting the transfer of heavy objects according to an embodiment of the present invention, when the weight is not transferred, the arm muscle strength support wire is wound or unwound to the wire length adjusting unit of the arm muscle strength support unit, thereby strengthening the arm muscle strength. The length of the support unit can be easily adjusted, and the operation of the wire length adjustment unit can be restrained by the load of the weight or the user's power in a state where the handle hook of the arm strength support unit is caught on the handle of the weight in the case of transporting a heavy item. there is. Therefore, in the present embodiment, since the operation of the wire length adjusting unit can be selectively restricted without a separate manipulation in the process of transporting a heavy object, inconvenience in adjusting the length of the arm muscle strength support wire can be reduced.

In addition, since the manual muscle support robot having a function of supporting the transfer of heavy objects according to an embodiment of the present invention has a structure that controls or restricts the operation of the wire length adjusting unit by the load of the heavy weight or the user's force during the transfer operation of the heavy object, the arm A separate switch for adjusting the length previously used for length change and restraint work of the muscle strength support wire can be omitted, and the weight of the weight or the user's force can be used as the restraint force required for the restraint of the wire length adjusting unit.

1 is a diagram schematically showing a force measurement jig of a joint motion measurement system according to an embodiment of the present invention.

2 and 3 are diagrams illustrating the joint motion measurement system shown in FIG. 1 .

4 is a view showing the first artificial bone shown in FIGS. 2 and 3;

5 is a schematic diagram of a joint motion measurement system according to another embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. Like reference numerals in each figure indicate like elements.

1 is a schematic diagram of a force measurement jig 200 of a joint motion measurement system 1000 according to an embodiment of the present invention. 2 and 3 are views showing the joint motion measurement system 1000 shown in FIG. 1 , and FIG. 4 is a view showing the first artificial bone 110 shown in FIGS. 2 and 3 .

1 to 3, a joint motion measurement system 1000 according to an embodiment of the present invention includes an artificial bone 100, a force measurement jig 200, a force measurement unit 300, and a joint evaluation unit. (400).

In this embodiment, after manufacturing the artificial bones 100, the artificial bones 100 are fixed to the force measurement jig 200 to form an artificial joint identical to that of the patient's knee joint, and the force measurement jig 200 It is possible to measure the force acting on the artificial joint through the force measurement unit 300 while moving the artificial joint by operating it, and the joint evaluation unit 400 uses the amount of change in the force measured by the force measurement unit 300. Damage to the cartilage tissue of the joint can be analyzed and evaluated.

As described above, the joint motion measurement system 1000 of the present embodiment can efficiently analyze and evaluate cartilage tissue or ligaments in the patient's knee joint by simulating the patient's knee joint and joint motion.

Hereinafter, in this embodiment, for convenience of explanation, the artificial bone 100 is manufactured from the patient's femur and tibia and installed in a structure to form an artificial knee joint in the force measurement jig 200, but acts on the cartilage tissue of the artificial knee. It is described as analyzing and evaluating the damage to the patient's actual cartilage tissue by measuring the force applied to it.

Referring to Figures 2 to 4, the artificial bone 100 of this embodiment, may be provided in plurality to form an artificial joint for simulating the joint of the patient. The artificial bones 100 as described above may be manufactured by a 3D printing manufacturing method using image data of a patient such as CT or MRI. For example, when data of a bone constituting a patient's knee joint is acquired, the artificial bone 100 may be manufactured through 3D printing by transforming the data of the bone into STL. At this time, the end of the artificial bone 100 forming the artificial joint can be made of a soft material to implement cartilage tissue, and a hole for installing an artificial ligament simulating a patient's ligament can also be formed.

In this embodiment, the artificial bones 100 are the first artificial bone 110 and the second artificial bone 120 corresponding to the first bone (eg, tibia) and the second bone (eg, femur) forming the joint of the patient. ) can be provided. The first artificial bone 110 and the second artificial bone 120 as described above may be disposed on the force measuring jig 200 in an elongated state in the vertical direction. In this case, the first artificial bone 110 may be positioned below the force measuring jig 200 and the second artificial bone 120 may be positioned above the force measuring jig 200 .

Here, the first artificial bone 110 may be provided in a shape corresponding to the first bone forming the patient's joint. For example, the first artificial bone 110 includes a first artificial bone body 112 formed in the same way as the first bone, and a material softer than the first artificial bone body at the joint portion of the first artificial bone body 112. It may include a first cartilage 114 formed of.

The first artificial bone body 112 may be manufactured by a 3D printing method, and the first cartilage 114 may be injection molded of a soft material such as silicon. The first cartilage 114 as described above may be coupled and fixed to the joint portion of the first artificial bone body 112 .

And, the second artificial bone 120 may be provided in a shape corresponding to the second bone forming the joint of the patient. For example, the second artificial bone 120 may include a second artificial bone body 122 formed identically to the second bone, and a second artificial bone body 122 at a joint portion of the second artificial bone body 122. ) It may include a second cartilage 124 formed of a softer material.

The second artificial bone body 122 may be manufactured by a 3D printing method, and the second cartilage 124 may be injection molded of a soft material such as silicon. The second cartilage 124 as described above may be coupled and fixed to the joint portion of the second artificial bone body 122 .

1 to 3 , the force measuring jig 200 according to the present embodiment may simulate joint motion of a patient by operating the artificial bones 100 . To this end, the first artificial bone 110 may be fixed to the lower part of the force measuring jig 200 in a vertically erected state, and the upper part of the force measuring jig 200 may face the first artificial bone 110. The second artificial bone 120 may be fixed in a vertically erected state. At this time, the upper end of the first artificial bone 110 and the lower end of the second artificial bone 120 may form an artificial joint in the middle of the force measurement jig 200 .

At this time, the first artificial bone 110 and the second artificial bone 120 are disposed in opposite directions to each other in the force measuring jig 200, and the upper end of the first artificial bone 110 and the second artificial bone 120 are disposed in opposite directions. An artificial joint may be formed by contacting the lower ends with each other. That is, the first cartilage 114 may be disposed on the upper end of the first artificial bone 110 and the second cartilage 124 may be disposed on the lower end of the second artificial bone 120 .

For example, the force measuring jig 200 may include a first jig 210 , a second jig 220 , and a jig driving unit 230 .

As shown in FIGS. 2 to 4 , the first jig 210 may be stably seated and fixed on the floor for installing the force measuring jig 200 . The first artificial bone 110 may be fixed to the first jig 210 . Accordingly, the first jig 210 may support the first artificial bone 110 while seated on the floor. Meanwhile, the second jig 220 may be rotatably connected to the upper end of the first jig 210 .

For example, the first jig 210 includes a base member 212 fixed to the center of the upper surface of the opposite side of the joint of the first artificial bone 110 and disposed on both sides of the upper surface of the base member 212, respectively. A first link member 214 may be included.

Here, the base member 212 is formed in a rectangular panel shape and can be stably seated on the bottom surface. At least one installation hole (not shown) used for installation as a fastening member may be formed on the bottom surface of the base member 212 .

In addition, the first link member 214 is installed on both sides of the upper surface of the base member 212, and may be formed in a shape extending long in the vertical direction on the upper surface of the base member 212. The first link members 214 as described above may be disposed in various positions to avoid interference with the first artificial bone 110 having various shapes and sizes according to the joint shape of the patient.

In addition, a first bone fixing part 212a used to fix the lower end of the first artificial bone 110 may be formed at the center of the upper surface of the base member 212 . The first bone fixing part 212a may be formed at a plurality of positions to variously change the fixing position of the first artificial bone 110 . However, in the present embodiment, it will be described that the first bone fixing part 212a is formed in a hole or groove shape at the center of the upper surface of the base member 212. In this case, a bone fixing protrusion 116 for fixing to the first bone fixing part 212a may be formed to protrude from the lower end of the first artificial bone main body 112 of the first artificial bone 110 . Meanwhile, the first bone fixing part 212a and the bone fixing protrusion 116 may be formed in an elliptical or polygonal cross-sectional shape to prevent arbitrary rotation of the first artificial bone 110 .

Meanwhile, at the lower end of the first link member 214, a first link fixing part 216 selectively fastened to a plurality of first link fixing holes formed on both sides of the upper surface of the base member 212 may be provided. . The first link fixing part 216 as described above may be installed and fixed as a fastening member in any one of the plurality of first link fixing holes, and accordingly, the distance between the first link members 214 may be variously changed. can

As shown in FIGS. 2 to 4 , the second jig 220 may be rotatably connected to the upper end of the first jig 210 . The second artificial bone 120 may be fixed to the second jig 220 . Accordingly, the second jig 220 may rotate together with the second artificial bone 120 . At this time, the second artificial bone 120 is disposed on the second jig 220 in the opposite direction to the first artificial bone 110 so as to form an artificial joint simulating the patient's joint together with the first artificial bone 110. can Meanwhile, the first jig 210 may be rotatably connected to the lower end of the second jig 220 .

For example, the second jig 220 includes a top member 222 in which the opposite side of the joint of the second artificial bone 120 is fixed to the center of the lower surface, and disposed on both sides of the lower surface of the top member 222, respectively. A second link member 224 may be included.

Here, the top member 222 may be disposed above the first link member 214 and connected to the first link member 214 by the second link member 224 . The top member 222 as described above may be disposed at a height where an upper end of the first artificial bone 110 and a lower end of the second artificial bone 120 contact each other to form an artificial joint.

And, the second link member 224 is installed on both sides of the lower surface of the top member 222, respectively, and may be formed in a shape extending long in the vertical direction on the lower surface of the top member 222. The second link members 224 as described above may be disposed in various positions according to the arrangement positions of the first link members 214 .

In addition, a second bone fixing part 222a used to fix the upper end of the second artificial bone 120 may be formed at the center of the lower surface of the top member 222 . The second bone fixing part 222a may be formed at a plurality of positions so that the fixing position of the second artificial bone 120 can be changed in various ways. However, in the present embodiment, it will be described that the second bone fixing part 222a is formed in a hole or groove shape at the center of the lower surface of the top member 222 at a position corresponding to the first bone fixing part 212a. . At this time, a bone-fixing protrusion for being fixed to the second bone-fixing part 222a may protrude from the lower end of the second artificial bone main body 122 of the second artificial bone 120 . Meanwhile, the second bone fixing part 222a and the bone fixing protrusion may be formed in an elliptical or polygonal cross-sectional shape to prevent arbitrary rotation of the second artificial bone 120 .

Meanwhile, at the lower end of the second link member 224, a second link fixing part 226 selectively fastened to a plurality of second link fixing holes formed on both sides of the lower surface of the top member 222 may be provided. . The second link fixing part 226 as described above may be installed and fixed as a fastening member in any one of a plurality of second link fixing holes, and accordingly, the distance between the second link members 224 may be variously changed. can

A first link connecting portion 214a may be formed at an upper end of the first link member 214 , and a second link connecting portion 224a may be formed at a lower end of the second link member 224 . The first link member 214 and the second link member 224 may be rotatably connected by fastening fastening members to the first link connecting portion 214a and the second link connecting portion 224a. At this time, since at least one of the first link connection part 214a or the second link connection part 224a is provided in plurality, the connection position of the first link connection part 214a and the second link connection part 224a is changed to change the first link connection part 214a and the second link connection part 224a. The connection length of the link member 214 and the second link member 224 can be conveniently adjusted, and accordingly, the first cartilage 114 of the first artificial bone 110 and the second cartilage of the second artificial bone 120 124 can be changed in various ways according to the joint shape of the patient. Hereinafter, in this embodiment, it will be described that a single number of first link connecting portions 214a are formed on the first link member 214 and a plurality of second link connecting portions 224a are formed on the second link member 224.

1 to 3, the jig driving unit 230 of the present embodiment, the first link member 214 of the first jig 210 and the second link member 224 of the second jig 220 It can be placed in the connected area. The jig driving unit 230 is connected to the connection portion of the first link member 214 and the second link member 224, and the second link member 214 and the second link member 224 are centered on the connection portion. It can be operated to rotate the jig 220 . Therefore, the joint motion of the first artificial bone 110 and the second artificial bone 120 can smoothly simulate the joint motion of the patient.

Hereinafter, in this embodiment, it will be described that the jig driving unit 230 includes a driving motor having a rotating shaft connected to the second link member 224 . At this time, the drive motor is preferably mounted on the first link member (214).

Referring to FIG. 4 , the force measuring unit 300 according to the present embodiment measures the force applied to the artificial joints of the first artificial bone 110 and the second artificial bone 120 in real time when the force measuring jig 200 is operated. can be measured with That is, the force measurement unit 300 measures the force applied to the joint during the joint motion of the first artificial bone 110 and the second artificial bone 120 so as to measure the force applied to the first artificial bone 110 and the second artificial bone 120 . (120) can be placed in the joint area.

For example, the force measuring unit 300 determines the amount of change in force applied to the first cartilage 114 and the second cartilage 124 during joint motion of the first artificial bone 110 and the second artificial bone 120. It may include a load cell for measuring. The load cell may be disposed inside at least one of the first cartilage 114 or the second cartilage 124 . That is, the load cell is disposed to be embedded between the first artificial bone body 112 and the first cartilage 114, or disposed to be embedded between the second artificial bone body 122 and the second cartilage 124. It can be.

Hereinafter, in this embodiment, it will be described that the force measurement unit 300 is installed on both the first artificial bone 110 and the second artificial bone 120, but is not limited thereto and is installed only on the first artificial bone 110 or It may be installed only on the second artificial bone 120 . The arrangement structure of the force measurement unit 300 as described above may be changed according to the design conditions of the joint motion measurement system 1000 and the structure of the joint.

Referring to FIGS. 1 to 3 , the joint evaluation unit 400 of the present embodiment may analyze a change in force measured by the force measurement unit 300 to evaluate the condition of the cartilage tissue of the patient's joint. To this end, the joint evaluation unit 400 may be connected to the force measurement unit 300 in a wired or wireless manner so as to receive a measurement result of the force measurement unit 300 . Hereinafter, in this embodiment, it will be described that the joint evaluation unit 400 is connected to the force measurement unit 300 in a wireless manner.

Therefore, the joint evaluation unit 400 analyzes the amount of change in force measured by the force measurement unit 300, and the knee of the patient simulated by the artificial joints of the first artificial bone 110 and the second artificial bone 120. It is possible to indirectly analyze the condition of the cartilage tissue for the joint, and using this, it is possible to evaluate the damage of the cartilage tissue in advance to obtain data for joint surgery of the patient.

5 is a schematic diagram of a joint motion measurement system 2000 according to another embodiment of the present invention.

In FIG. 5, the same reference numerals as those shown in FIGS. 1 to 4 denote the same members, and a detailed description thereof will be omitted. Hereinafter, different points from the joint motion measurement system 1000 shown in FIGS. 1 to 4 will be mainly described.

Referring to FIG. 5, the joint motion measurement system 2000 according to another embodiment of the present invention is different from the joint motion measurement system 1000 shown in FIGS. There is a difference in that the structure disposed in the ligament (130).

In the joint motion measurement system 2000 of the present embodiment, the artificial ligament 130 is disposed at the joint between the first artificial bone 110 and the second artificial bone 120, and the force measuring unit 310 is the artificial ligament ( 130) may be connected to the artificial ligament 130 to measure the force applied thereto.

Here, the artificial ligament 130 is a wire type configuration that simulates the ligament in the patient's knee joint, and can be connected to holes drilled in the upper end of the first artificial bone 110 and the lower end of the second artificial bone 120. there is. One side of the artificial ligament 130 may be connected to the first artificial bone 110 and the second artificial bone 120, and the other side of the artificial ligament 130 may be connected to the force measuring unit 310.

For reference, the artificial ligament 130 may simulate the posterior cruciate ligament, medial collateral ligament, and lateral collateral ligament excluding the anterior cruciate ligament among the four ligaments in the patient's knee joint. Both ends of the artificial ligaments 130 not connected to the force measuring unit 310 among the artificial ligaments 130 described above are fixed to the joint portions of the first artificial bone 110 and the second artificial bone 120, respectively. It can be.

In addition, the force measurement unit 310 is applied to the artificial ligament 130 when the artificial joint of the first artificial bone 110 and the second artificial bone 120 implements the joint motion of the patient by the force measuring jig 200. You can measure how the applied force changes. For example, the force measuring unit 310 measures the amount of change in the force applied to the artificial ligament 130 during joint motion between the first artificial bone 110 and the second artificial bone 120. It may include a load cell connected to.

The force measuring unit 310 as described above may be disposed at a position spaced apart from the outside of the force measuring jig 200 by a predetermined distance. In this case, the artificial ligament 130 may be extended from the first artificial bone 110 and the second artificial bone 120 to the force measurement unit 310 and connected to the force measurement unit 310 .

Meanwhile, in the joint motion measurement system 2000 of this embodiment, the force measurement unit 310 is described as a structure connected only to the artificial ligament 130, but for convenience of description, the first artificial bone 110 and the second artificial bone It is described as having a structure in which a force measurement unit is not installed in (120). However, it is not limited thereto, and as shown in FIG. 4 , the force measurement unit 300 may be installed on the first artificial bone 110 and the second artificial bone 120, even in such a case, the force measurement unit 310 ) There is no problem in measuring the amount of change in the force acting on the artificial ligament 130.

In addition, in the joint motion measurement system 2000 of this embodiment, the first artificial bone 110 and the second artificial bone 120 are

artificial bone bodies

112 and 122 and cartilage 114, as shown in FIG. 124). However, in the case of a structure in which the force measuring unit 300 is not installed on the artificial bone 100 as in the present embodiment, the artificial bone 100 may be configured only with the

artificial bone bodies

112 and 122 and the cartilage may be omitted.

As described above, the embodiments of the present invention have been described with specific details such as specific components and limited embodiments and drawings, but these are provided only to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. It is not, and those skilled in the art can make various modifications and variations from these descriptions. Therefore, the spirit of the present invention should not be limited to the described embodiments and should not be determined, and all things equivalent or equivalent to the claims as well as the following claims belong to the scope of the present invention.

Claims

A plurality of artificial bones forming an artificial joint to simulate the patient's joint; and

a force measuring jig in which the artificial bones are installed and fixed, and which operates the artificial bones to simulate the joint motion of the patient;

a force measuring unit measuring a force applied to the artificial joint when the force measuring jig is operated; and

a joint evaluation unit configured to analyze a change in force measured by the force measurement unit to evaluate a state of cartilage tissue of the patient's joint;

Joint motion measurement system comprising a.
According to claim 1,

The artificial bones may include a first artificial bone provided in a shape corresponding to a first bone forming a joint of the patient; and a second artificial bone provided in a shape corresponding to a second bone forming a joint with the first bone,

The force measurement jig may include a first jig to which the first artificial bone is fixed; a second jig rotatably connected to the first jig and fixing the second artificial bone so that the first artificial bone and the second artificial bone form an artificial joint simulating a joint of the patient; and a joint between the first artificial bone and the second artificial bone by rotating the second jig around the connection between the first jig and the second jig. A joint motion measurement system comprising a; jig driving unit that simulates motion.
According to claim 2,

The first artificial bone may include: a first artificial bone body formed identically to the first bone; and a first cartilage formed of a material softer than that of the first artificial bone body at a joint portion of the first artificial bone body,

The second artificial bone may include a second artificial bone body formed identically to the second bone; and a second cartilage formed of a softer material than the second artificial bone body at a joint portion of the second artificial bone body.
According to claim 3,

The force measurement unit is disposed at a joint of the first artificial bone and the second artificial bone to measure a force applied to the joint during a joint motion of the first artificial bone and the second artificial bone. Joint motion measurement system to be.
According to claim 4,

The force measuring unit may include at least one of the first cartilage and the second cartilage to measure a change in force applied to the first cartilage and the second cartilage during joint motion of the first artificial bone and the second artificial bone. It includes a load cell disposed inside one,

The joint motion measurement system according to claim 1 , wherein the load cell is disposed to be embedded between the first artificial bone body and the first cartilage, or disposed to be embedded between the second artificial bone body and the second cartilage. .
According to claim 4,

Artificial ligaments are connected to the first artificial bone body and the second artificial bone body,

The force measuring unit includes a load cell connected to the artificial ligament to measure a change in force applied to the artificial ligament during joint motion of the first artificial bone and the second artificial bone,

The joint motion measurement system, characterized in that the load cell is disposed at a position spaced apart from the force measuring jig, and the artificial ligament extends long toward the load cell and is connected to the load cell.
According to claim 2,

The first jig is seated and fixed to the bottom surface,

The lower end of the second jig is rotatably connected to the upper end of the first jig,

The jig driving unit includes a driving motor mounted on an upper end of the first jig such that a rotation shaft is connected to a lower end of the second jig.
According to claim 7,

The first jig may include a base member seated on the bottom surface and fixed to a center of an upper surface portion opposite to a joint portion of the first artificial bone; And a first link member disposed on both sides of the upper surface of the base member and extending in a vertical direction from the upper surface of the base member;

The second jig is disposed above the first link member, and the opposite side of the joint of the second artificial bone is at the center of the lower surface so that the joint of the first artificial bone and the second artificial bone come into contact with each other. fixed top member; And a second link member disposed on both sides of the lower surface of the top member, extending vertically from the lower surface of the top member and rotatably connected to the first link member. instrumentation system.
According to claim 8,

A bone fixing part for fixing the first artificial bone and the second artificial bone is formed on the base member and the top member, respectively;

Characterized in that, at least one of the base member and the top member, the bone fixing parts are provided at a plurality of positions so as to change the fixing positions of the first artificial bone and the second artificial bone according to the joint shape of the patient. joint motion measurement system.
According to claim 8,

In the first link member and the second link member, the connection length of the first link member and the second link member is changed so that a distance between the first artificial bone and the second artificial bone is changed according to the joint shape of the patient. A joint motion measurement system, characterized in that each of the plurality of link connections for adjusting is formed.