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US6206835: Remotely interrogated diagnostic implant device with electrically passive sensor

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Filing Information

Inventor(s) William B. Spillman, Jr. · Eric M. Weissman · Elmer D. Dickens, Jr. ·
Assignee(s) The B. F. Goodrich Company ·
Attorney/Agent(s) Mark D. Saralino · Brian M. Kolkowski ·
Primary Examiner Carl H. Layno ·
Application Number US9275308
Filing date 03/24/1999
Issue date 03/27/2001
Predicted expiration date 03/24/2019
U.S. Classifications 600/485  · 623/900  · 128/903  · 606/191  · 623/1  · 600/481  ·
International Classifications --
Kind CodeB1
International Classifications 128903 · 600481 · 600508 · 600485 · 606191 · 606198 · 623900 · 623 1 ·
19 Claims, 9 Drawings


Abstract

An implant device is provided which is responsive to an external interrogation circuit. The implant device includes a structure implantable within a living animal and operatively configured to carry out or assist in carrying out a function within the living animal. The device further includes an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function. In particular, the sensing circuit includes an inductive element wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter.

Independent Claims | See all claims (19)

  1. 1. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function, the sensing circuit including an inductive element wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter.
  2. 10. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; and an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function; wherein the sensing circuit includes an inductive element; wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter; and wherein the structure is a graft insertable in line with an existing blood vessel for facilitating blood flow through the vessel.
  3. 15. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; and an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function; wherein the sensing circuit includes an inductive element; wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter; and wherein the sensing circuit comprises a SAW sensor having an output dependent upon the sensed parameter to produce changes in the impedance loading effect of the sensing circuit.
  4. 17. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; and an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function; wherein the sensing circuit includes an inductive element; wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter: wherein the structure is a stent insertable in a blood vessel to facilitate blood flow through the vessel; and wherein the stent comprises a composite structure and the inductive element is embedded in the composite structure.
  5. 18. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; and an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function; wherein the sensing circuit includes an inductive element; wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter; wherein the structure is a stent insertable in a blood vessel to facilitate blood flow through the vessel; and wherein the inductive element is a double helix structure.
  6. 19. An implant device responsive to an interrogation circuit having an exciter/interrogator element which is located outside a living animal, the implant device comprising: a structure implantable within the living animal and operatively configured to carry out or assist in carrying out a function within the living animal; an electrically passive sensing circuit integral with the structure for sensing a parameter associated with the function; wherein the sensing circuit including an inductive element; wherein the sensing circuit has a frequency dependent variable impedance loading effect on the interrogation circuit in response to an interrogation signal provided by the exciter/interrogator element, the impedance loading effect varying in relation to the sensed parameter; wherein the structure is a stent insertable in a blood vessel to facilitate blood flow through the vessel; and wherein the sensed parameter represents a degree of restenosis within the stent.

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“Sensing and Processing for Smart Structures”; W. B. Spillman, Jr.; Proceedings of the IEEE, vol. 84, No. 1, Jan. 1996 pp. 68-77.
“Bio -Medical Telemetry Sensing and Transmitting Biological Information From Animals and Man”; R. Stuart Mackay; IEEE Press; (e g, pp. 69-70 and pp. 298-315).

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