# US 10,500,071 B2 · Sensor device applied in articulation and artificial limb system with sensor device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,500,071 B2 - Document ID: US10500071B2 - Status: Granted - Kind: B2 - Application number: 15/521,583 - Filed: 2016-06-21 - Published: 2018-06-28 - Granted: 2019-12-10 - Earliest claimed: 2016-03-25 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Hong Wang - Web page: https://patentgrep.com/patent/US10500071B2 ## CPC - A61B 5/11: Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb {(A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721)} - A61B 5/1121: {Determining geometric values, e.g. centre of rotation or angular range of movement} - A61B 5/4571: {Evaluating the hip} - A61B 5/4851: {Prosthesis assessment or monitoring} - A61F 2/70: electrical - G01R 33/0005: {Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types (G01R33/0206 takes precedence)} - G01R 33/072: {Constructional adaptation of the sensor to specific applications} - A61B 5/1126: {using a particular sensing technique} - A61B 5/6867: {specially adapted to be attached or implanted in a specific body part (A61B5/6847 takes precedence)} - A61B 2562/0223: Magnetic field sensors - A61F 2/482: {Electrical means} - A61F 2002/6863: {magnetic} - A61F 2002/762: {for measuring dimensions, e.g. a distance} - A61F 2002/7625: {for measuring angular position} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract Embodiments of the present disclosure relate to the field of medical instrument, in particular to a sensor device applied in an articulation and an artificial limb system to improve control precision of the sensor. The sensor device of the present disclosure includes a plurality of magnets spaced apart from each other, the adjacent magnets having opposite polarities in a moving direction of the articulation; and at least one magnetic inductor for monitoring a displacement of the magnets caused by movement of the articulation. ## Claims ### Claim 1 A sensor device configured to be applied in an articulation, the sensor device comprising: a plurality of magnets spaced apart from each other, adjacent magnets of the plurality of magnets having opposite polarities in a moving direction of the articulation; and at least one magnetic inductor for monitoring displacement of the magnets caused by movement of the articulation, wherein the at least one magnetic inductor is configured to detect magnetic fields of different directions and determine positions of the plurality of magnets based on a number of changes of the magnetic fields when the plurality of magnets move. ### Claim 2 (depends on 1) The sensor device according to claim 1, further comprising a protective layer disposed between the plurality of magnets and the at least one magnetic inductor so as to protect the magnets and prevent a change in spacing between the magnets. ### Claim 3 (depends on 2) The sensor device according to claim 2, wherein the protective layer is made of the same material as that of a bone at the articulation. ### Claim 4 (depends on 1) The sensor device according to claim 1, wherein the plurality of magnets are configured to be disposed in a first bone at the articulation, and the at least one magnetic inductor is configured to be disposed on a surface of a second bone articulated with the first bone. ### Claim 5 (depends on 4) The sensor device according to claim 4, wherein each of the plurality of magnets is configured to be inserted into one of a plurality of pores uniformly arranged on a surface of the first bone. ### Claim 6 (depends on 5) The sensor device according to claim 5, wherein the articulation has an articulate head located at the first bone and an acetabulum located at the second bone or the articulation has an articulate head located at the second bone and an acetabulum located at the first bone. ### Claim 7 (depends on 5) The sensor device according to claim 5, wherein the magnets are in a form of a cylinder having a diameter of 0.08 mm±0.01 mm. ### Claim 8 (depends on 1) The sensor device according to claim 1, wherein the at least one magnetic inductor comprises a Hall element. ### Claim 9 (depends on 8) The sensor device according to claim 8, wherein the plurality of magnets are arranged in a matrix structure substantially regularly arranged in a first direction in which the articulation moves and a second direction perpendicular to the first direction, and in the matrix structure the adjacent magnets in each row in the first direction have opposite polarities to each other and all the magnets in each column in a second direction have the same polarity. ### Claim 10 (depends on 9) The sensor device according to claim 9, wherein the sensor device is configured so that the articulation can be provided with two magnetic inductors arranged to be perpendicularly intersected with each other in the first and second directions respectively. ### Claim 11 (depends on 10) The sensor device according to claim 10, wherein the two magnetic inductors and the plurality of magnets have an initial position relationship in that projections of the two magnetic inductors on the surface of a first bone on which a plurality of magnets are placed are not overlapped with the plurality of the magnets. ### Claim 12 (depends on 11) The sensor device according to claim 11, further comprising a timer for recording a time during which the magnets are displaced. ### Claim 13 (depends on 1) An artificial limb system comprising the sensor device according to claim 1 and at least two artificial limb bodies, wherein the sensor device is located at an articulation formed by the artificial limb bodies.