Apparatus for measuring mechanical parameters of the prostate and for imaging the prostate using such parameters

• US 5,836,894 A
• Filed: 06/10/1997
• Issued: 11/17/1998
• Est. Priority Date: 12/21/1992
• Status: Expired due to Term

• Current Assignee: ProUroCare Medical, Inc.
• Original Assignee: Artann Laboratories Inc.
• Inventors: Sarvazyan, Armen P.
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US08/872,561
• Time in Patent Office: 525 Days
• Field of Search: 600/486, 600/488, 600/561, 600/587
• US Class Current: 600/587
• CPC Class Codes: A61B 1/0052 Constructional details of control elements, e.g. handles
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/046 in a matrix array
• CPC Class Codes: A61B 5/0053 by applying pressure, e.g. compression, indentation, palpation, grasping, gauging
• CPC Class Codes: A61B 5/036 by means introduced into body tracts A61B5/032 and A61B5/035 take precedence
• CPC Class Codes: A61B 5/064 using markers A61B5/062 takes precedence
• CPC Class Codes: A61B 5/4312 Breast evaluation or disorder diagnosis A61B5/0091 takes precedence
• CPC Class Codes: A61B 5/4381 Prostate evaluation or disorder diagnosis
• CPC Class Codes: A61B 8/0825 for diagnosis of the breast, e.g. mammography
• CPC Class Codes: A61B 8/0833 involving detecting or locating foreign bodies or organic structures
• CPC Class Codes: A61B 8/12 in body cavities or body tracts, e.g. by using catheters catheters per se A61M25/00
• CPC Class Codes: A61B 8/485 involving measuring strain or elastic properties
• CPC Class Codes: G01S 7/52042 determining elastic properties of the propagation medium or of the reflective target diagnostic techniques involving the measurement of strain A61B8/485

Abstract

A pressure force sensing array is used to measure the surface stress pattern on soft tissues. The pattern of mechanical stress and the changes in the pattern as a function of the applied pressure, position of the array and time are processed to construct an image of the internal structure of the tissues. The detected parameters and processed image provide information useful in the detection and diagnosis of soft tissue pathologies such as breast and prostate tumors. The present invention relates to an apparatus particularly useful for mechanical imaging of the prostate which comprises a transrectal probe. The probe includes a probe shaft, a position sensor for determining the position of the tip and an array of force sensors for determining the pattern of pressure from tissue deformed by the tip.

Claims

1. A transrectal probe for measuring mechanical properties of the prostate gland comprising:

a control handle;

a probe shaft having an axis, said shaft extending from said handle; and

a tip at the end of said shaft for pressing against tissue overlying surfaces of the prostate gland, said tip comprising a position sensor for measuring the position of said tip and an array of force sensors for measuring a pattern of pressure when said tip is pressed against said tissue.

2. The transrectal probe of claim 1 wherein the tip is movable above and below the axis of said probe shaft.

3. The probe of claim 2 wherein said tip is covered by a disposable sheath of soft, flexible material.

4. The probe of claim 2 wherein said tip and at least a portion of said shaft is covered by a disposable sheath of soft, flexible material.

5. The probe of claim 1 further comprising paths for transmitting signals said from said position sensor and the pattern of pressure detected by said array to a signal processor.

6. The probe of claim 5 wherein said control handle comprises a switch for controlling input from said position sensor and said array of force sensors to a computer interface.

7. The probe of claim 1 wherein said control handle comprises a pistol grip handle.

8. The probe of claim 1 wherein said force sensors comprise bending beam force sensors.

9. The probe of claim 1 wherein said array of pressure sensors is formed of a left row of said pressure sensors and a right row of said pressure sensors, said left row of said pressure sensors measures pressure applied against the left surface of said tip and said tip and said right row of said pressure sensors measures pressure applied against the right surface of said tip.