Method for sensing pressure in an object

• US 5,109,852 A
• Filed: 06/08/1990
• Issued: 05/05/1992
• Est. Priority Date: 06/08/1990
• Status: Expired due to Term

• Current Assignee: David B. Kaye
• Original Assignee: Charles D. Melville, David B. Kaye
• Inventors: Melville, Charles D., Kaye, David B.
• Primary Examiner(s): SHAY, RANDY CITRIN
• Application Number:
  US07/535,410
• Time in Patent Office: 697 Days
• Field of Search: 128/645, 128/646, 128/652, 73/723, 73/754, 73/DIG. 4
• US Class Current: 600/398
• CPC Class Codes: A61B 3/16 for measuring intraocular pressure, e.g. tonometers
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: G01L 11/004 by the use of counterbalancing forces measuring force by the use of counterbalancing forces G01L1/08
• CPC Class Codes: Y10S 73/04 Piezoelectric

Abstract

A method for sensing pressure within a work object including placing an electrically deformable member on the work object so as to cover a portion of the surface area thereof; applying electrical energy to the member to cause the member to deform thereby applying pressure to the portion of the surface of the work object; and sensing the tension in the member as a result of the amount of resistance to deformation imparted by the pressure within the work object.

An apparatus for sensing pressure within a work object including a member adapted to be disposed in overlaying relation to a portion of the surface area of the work object; an energizing system connected to the member for causing the member to deform so as to apply pressure to the surface area of the work object when disposed in overlaying relation to the work object to, in turn, cause the surface area of the work object to deform; and a detecting system operable to detect the magnitude of the deformation of the surface area of the work object as an indication of the pressure within the work object.

Claims

1. A method for sensing pressure within a work object comprising:

A. placing an electrically deformable member on the work object so as to cover a portion of the surface area thereof;

B. applying electrical energy to said member to cause the member to deform thereby applying pressure to said portion of the surface area of the work object; and

C. sensing the tension in said member dependent upon the amount of resistance to deformation imparted by the pressure within said work object.

2. The method of claim 1 including

D. calculating the pressure within said work object from the magnitude of the tension in said member sensed in the sensing step.

3. The method of claim 1 wherein the tension in said member resulting from the resistance to deformation imparted by the pressure within the work object creates an electric potential in said member which is proportional to said pressure within the work object and said sensing step includes sensing said electric potential.

4. The method of claim 1 wherein said work object is an eyeball having a cornea and said member is a transducer placed in said placing step in overlaying relation to the cornea.

5. The method of claim 4 wherein said placing step includes placing a transmitter/receiver in electrical connection to said transducer, operable upon receiving a signal to apply said electrical energy to the transducer, sense the resulting tension in said transducer and to transmit a signal corresponding thereto, said applying step includes remotely actuating said transmitter/receiver by sending a signal to said transmitter/receiver and said sensing step includes remotely receiving the signal transmitted by said transmitter/receiver.

6. The method of claim 5 wherein the placing step includes placing said transmitter/receiver between the eyelid and eyeball.

7. The method of claim 5 wherein said applying step includes periodically over time applying said electrical energy to the transducer and said sensing step includes recording over time the signals received from said transmitter/receiver.

8. The method of claim 7 including

D. calculating the pressure within said eyeball for each signal received from said transmitter/receiver.

9. The method of claim 4 wherein said transducer is constructed of semitransparent piezoelectric film placed on said cornea of the eyeball in the manner of a contact lens.