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Smart physiologic parameter sensor and method

Imported: 24 Feb '17 | Published: 13 Jan '04

Ronald S. Conero, Stuart L. Gallant

USPTO - Utility Patents

Abstract

A sensor assembly used for the measurement of one or more physiologic parameters of a living subject which is capable of storing both data obtained dynamically during use as well as that programmed into the device. In one embodiment, the sensor assembly comprises a disposable combined pressure and ultrasonic transducer incorporating an electrically erasable programmable read-only memory (EEPROM), the assembly being used for the non-invasive measurement of arterial blood pressure. The sensor EEPROM has a variety of information relating to the manufacture, run time, calibration, and operation of the sensor, as well as application specific data such as patient or health care facility identification. Portions of the data are encrypted to prevent tampering. In a second embodiment, one or more additional storage devices (EEPROMs) are included within the host system to permit the storage of data relating to the system and a variety of different sensors used therewith. In a third embodiment, one or more of the individual transducer elements within the assembly are made separable and disposable, thereby allowing for the replacement of certain selected components which may degrade or become contaminated. Methods for calibrating and operating the disposable sensor assembly in conjunction with its host system are also disclosed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1

a is an exploded perspective view of a first embodiment of the smart sensor assembly according to the present invention.

FIG. 1

b is top perspective view of the sensor assembly of FIG. 1, shown assembled.

FIG. 1

c is bottom perspective view of the sensor assembly of FIG. 1, shown assembled.

FIG. 2

a is a perspective assembly view of a second embodiment of the smart sensor assembly of the invention.

FIG. 2

b is a cross-sectional view of the sensor assembly housing of FIG. 2, taken along lines

2

2.

FIG. 2

c is perspective view of the sensor assembly of FIG. 2

a, shown installed within a gimbal assembly.

FIG. 3 is a top plan view of a third embodiment of the sensor assembly of the invention, having both removable/disposable pressure and ultrasonic transducers.

FIG. 4 is a functional block diagram illustrating a first embodiment of a physiologic parameter measurement apparatus incorporating the smart sensor assembly of the invention.

FIG. 5 is a logical block diagram of a second embodiment of the physiologic parameter measurement apparatus of the invention, including a wireless communications link.

FIG. 6 is a logical flow diagram illustrating one exemplary embodiment of the method of calibrating a disposable sensor element according to the invention.

FIG. 7 is a schematic diagram of a first embodiment of the logic circuit of the invention.

FIG. 8 is a schematic diagram of a second embodiment of the logic circuit of the invention.

FIG. 9 is a flow diagram illustrating one embodiment of the method of evaluating the acceptability of the smart sensor assembly of the invention in conjunction with the physiologic parameter measurement apparatus of FIG.

4.

FIG. 10 is a flow diagram illustrating one embodiment of the generalized method of encoding and storing data related to an applanation measurement performed on a patient within the sensor assembly of the invention.

FIG. 11 is a flow diagram illustrating one exemplary embodiment of the method of encoding physiologic parameters within the sensor of the present invention.

FIG. 12 is an exemplary plot of pressure and arterial blood velocity data which is encoded using the method of the present invention.

Claims

1. A method of calibrating a transducer element, comprising:

2. The method of claim 1, wherein said act of calibrating said transducer element comprises at least periodically calibrating said element during use of said element on a living subject.

3. The method of claim 2, further comprising:

4. The method of claim 1, further comprising:

5. A method of calibrating a transducer element, comprising:

6. A method of calibrating a transducer element, comprising:

7. The method of claim 6, wherein said act of calibrating said transducer element comprises at least periodically calibrating said element during use of said element on a living subject.

8. The method of claim 7, further comprising:

9. The method of claim 6, further comprising:

10. A method of calibrating a sensor means, comprising:

11. A transducer element having a predetermined operating response and an associated storage device, said element adapted to tonometrically measure the pressure associated with a blood vessel, said element being adapted for calibration according to the method comprising;

12. A transducer element having a predetermined operating response and an associated storage device, said element adapted to tonometrically measure the pressure associated with a blood vessel, said operating response comprising a bridge voltage and output voltage which may each vary with temperature and pressure;

13. A replaceable component of a medical device, comprising:

14. The component of claim 13, wherein said at least one pressure transducer element comprises a silicon strain beam pressure transducer capable of generating an electrical signal in response to pressure applied thereto.

15. The component of claim 13, wherein at least a portion of said data comprises prestored data relating to the compatibility of said pressure transducer with said host device.

16. The component of claim 13, wherein said data is utilized to calibrate said pressure transducer at least periodically during the measurement of said blood pressure.

17. A replaceable component of a medical device, comprising:

18. A replaceable component of a medical device, comprising:

19. The component of claim 18, wherein said at least one pressure transducer element comprises a silicon strain beam pressure transducer capable of generating an electrical signal in response to pressure applied thereto.

20. The component of claim 18, wherein at least a portion of said data comprises prestored data relating to the compatibility of said pressure transducer with said host device.

21. The component of claim 18, wherein said data is utilized to calibrate said pressure transducer at least periodically during the measurement of said blood pressure.