IP Library Granted Patent US 12,419,581
Granted Patent B2
US 12,419,581 · App. 19/035,284 · Granted Sep 23, 2025

Wireless measurement of suture tension

Inventors: Keat Ghee Ong (Eugene, OR); Salil Sidharthan Karipott (Eugene, OR); Robert Erling Guldberg (Eugene, OR); Kaylee M. Meyers (Eugene, OR)
Assignee: UNIVERSITY OF OREGON
A61B5/6883A61B5/076A61B5/4523A61B5/486A61B17/06166A61B2017/00004A61B2090/064A61B2562/164
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Quick Facts
Patent No.
US 12,419,581
App. No.
19/035,284
Granted
Sep 23, 2025
Kind
B2
Abstract

Certain examples of the disclosure concern an implantable sensor. The implantable sensor includes a sensor assembly configured to connect to a suture. The sensor assembly also includes a substrate and a resonant circuit coupled to the substrate. The resonant circuit is configured to electrically resonate at a resonant frequency when exposed to a first electromagnetic field and to emit a second remotely detectable electromagnetic field. The substrate is configured to deform in response to a tensile force applied by the suture and to change a resonant parameter of the resonant circuit in response to the deformation.

Claims (52)

1. A sensor assembly, comprising:

a suture button defining two openings for receiving a suture; and

a suture button adapter comprising:

one or more openings for receiving the suture; and

an enclosure configured to deform in response to a tensile force applied by the suture via the suture button and enclosing:

a deformable member comprising a top surface and a bottom surface; and

a resonant circuit comprising at least one inductor and a resistive transducer, wherein:

the resistive transducer is coupled to the bottom surface of the deformable member;

the at least one inductor is electronically connected to the resistive transducer and extends around a perimeter of the deformable member;

the resonant circuit is configured to electrically resonate at a resonant frequency when exposed to a first electromagnetic field and to emit a second remotely detectable electromagnetic field, the resonant circuit having a resistance that varies in response to a deformation, such that the resonant circuit has a resonant quality factor determined at least by an inductance of the at least one inductor, a capacitance, and the resistance of the resistive transducer;

deformation of the enclosure deforms the deformable member and the resistive transducer, thereby changing the resistance of the resistive transducer and the resonant quality factor of the resonant circuit; and

the resonant frequency of the resonant circuit is determined at least in part by the inductance of the at least one inductor and an inherent parasitic capacitance of the at least one inductor.

2. The sensor assembly of claim 1 , wherein the resistive transducer is a strain gauge.

3. The sensor assembly of claim 2 , wherein:

the sensor assembly is configured to receive the suture through the suture button and the suture button adapter; and

the suture passes through the one or more openings and the deformable member.

4. The sensor assembly of claim 3 , wherein the deformable member comprises a metal or metal alloy.

5. The sensor assembly of claim 4 , wherein the suture contacts the top of the suture button with a portion of the suture passing through one of the two openings.

6. The sensor assembly of claim 5 , wherein the suture is attached to a graft and tightened to create a tensile force on the suture, which creates a tensile force on the suture button and suture button adaptor.

7. The sensor assembly of claim 6 , wherein the enclosure comprises a polymeric material.

8. The sensor assembly of claim 7 , further comprising one or more additional resistive transducers.

9. A sensor assembly comprising:

a suture button adapter configured to be coupled to a suture button and comprising:

one or more openings for receiving a suture; and

an enclosure configured to deform in response to a tensile force applied by the suture and enclosing:

a deformable member comprising a top surface and a bottom surface; and

a resonant circuit comprising at least one inductor and a resistive transducer, wherein:

the resistive transducer is coupled to the bottom surface of the deformable member;

the at least one inductor is electronically connected to the resistive transducer and extends around a perimeter of the deformable member;

the resonant circuit is configured to electrically resonate at a resonant frequency when exposed to a first electromagnetic field and to emit a second remotely detectable electromagnetic field, the resonant circuit having a resistance that varies in response to the deformation, such that the resonant circuit has a resonant quality factor determined at least by an inductance of the at least one inductor, a capacitance, and the resistance of the resistive transducer;

the deformation of the enclosure deforms the deformable member and the resistive transducer, thereby changing the resistance of the resistive transducer and the resonant quality factor of the resonant circuit; and

the resonant frequency of the resonant circuit is determined at least in part by the inductance of the at least one inductor and an inherent parasitic capacitance of the at least one inductor.

10. The sensor assembly of claim 9 , wherein the resistive transducer is a strain gauge.

11. The sensor assembly of claim 10 , wherein the suture passes through the one or more openings and the deformable member.

12. The sensor assembly of claim 11 , wherein the deformable member comprises a metal or metal alloy.

13. The sensor assembly of claim 12 , wherein the enclosure comprises a polymeric material.

14. The sensor assembly of claim 13 , further comprising a resonant parameter having the resonant frequency, the resonant quality factor, or impedance of the resonant circuit.

15. The sensor assembly of claim 14 , wherein the suture contacts the top of the suture button with a portion of the suture passing through one of the two openings.

16. The sensor assembly of claim 15 , wherein the suture is attached to a graft and tightened to create a tensile force on the suture, which creates a tensile force on the suture button and suture button adaptor.

17. A sensor assembly comprising:

a suture button adapter configured to be coupled to a suture button and comprising:

one or more openings for receiving a suture; and

a deformable member comprising a top surface and a bottom surface;

a resonant circuit comprising at least one inductor and a resistive transducer, wherein:

the resistive transducer is coupled to the bottom surface of the deformable member;

the at least one inductor is electronically connected to the resistive transducer;

the resonant circuit is configured to electrically resonate at a resonant frequency when exposed to a first electromagnetic field and to emit a second remotely detectable electromagnetic field, the resonant circuit having a resistance that varies in response to the deformation, such that the resonant circuit has a resonant quality factor determined at least by an inductance of the at least one inductor, a capacitance, and the resistance of the resistive transducer;

deformation of the deformable member and the resistive transducer thereby changes the resistance of the resistive transducer and the resonant quality factor of the resonant circuit; and

the resonant frequency of the resonant circuit is determined at least in part by the inductance of the at least one inductor and an inherent parasitic capacitance of the at least one inductor.

18. The sensor assembly of claim 17 , wherein the deformation of the deformable member comprises bending, elongation, compression, rotation, torsion, or flexion.

19. The sensor assembly of claim 18 , wherein the sensor assembly further comprises at least one capacitor.

20. The sensor assembly of claim 19 , wherein the deformable member comprises a metal or metal alloy.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 4, 2025
From: ONG, KEAT GHEE; KARIPOTT, SALIL SIDHARTHAN; GULDBERG, ROBERT ERLING; MEYERS, KAYLEE M.
To: UNIVERSITY OF OREGON
Reel/Frame 070392/0965 →
Continuity (4)
Continuation 18682599
Provisional Application 63347122 · May 31, 2022
Provisional Application 63231102 · Aug 9, 2021
Related Publication 20250195004A1 · Jun 19, 2025
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