Microwave endoscope detection and treatment system

• US 4,557,272 A
• Filed: 02/09/1981
• Issued: 12/10/1985
• Est. Priority Date: 03/31/1980
• Status: Expired due to Term

• Current Assignee: Microwave Associates Incorporated
• Original Assignee: Microwave Associates Incorporated
• Inventors: Carr, Kenneth L.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Jaworski, Francis J.
• Application Number:
  US06/232,820
• Time in Patent Office: 1,765 Days
• Field of Search: 128/653, 128/804, 128/736, 128/4
• US Class Current: 600/549
• CPC Class Codes: A61B 5/015 By temperature mapping of body part
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves
• CPC Class Codes: A61N 5/02 using microwaves

Abstract

The microwave system is employed for the detection of cancerous tumors and is particularly effective in the early detection of such tumors. The system is of the dual type, combining in a single unit a passive radiometer with an active microwave transmitter. The sensitive passive microwave radiometer is adapted to sense subsurface temperatures, coupled with a solid state microwave transmitter for providing localized heating of the subsurface tissue, thereby taking advantage of the differential heating due to vascular insufficiency associated with the thermal characteristics of tumors, thus highlighting and enhancing early detection of cancer. A delay period on the order of five minutes is defined between heat application and detection in order to optimize temperature differential. The transmitter or applicator is for internal use employing a radiating element adapted for use with an endoscopic apparatus.

Claims

1. A microwave transducer for applying energy to and receiving energy from living tissue, said transducer comprising:

a microwave transmitter,

a radiating element,

a microwave radiometer means,

a section of transmission line coupled to said radiating element,

said radiating element comprising a dielectric impedance-matching means for substantially matching said radiating element to said tissue but substantially mis-matching said radiating element to air,

said dielectric impedance matching means having a smooth end tip,

means coupling the microwave transmitter to the end of the transmission line remote from said radiating element and for establishing at the radiating element a heating temperature over a predetermined heating period and greater than the normal human body temperature,

means coupling the microwave radiometer means in common with the microwave transmitter to the remote end of the transmission line,

said microwave radiometer means comprising means for sensing temperature at a resolution of fractions of a centigrade degree,

in combination with an endoscopic guide means adapted for passage into an opening in a living body, said guide means including a passage for said transducer and said transmission line, and carrying observation means and light transmission means whereby said transducer may be placed in an observable-operative position within the body,

said means for sensing temperature being operative to register a temperature differential only after a predetermined waiting period following said predetermined heating period so as to increase the temperature differential measurement,

said section of transmission line including an inner conductor and an outer conductor,

said radiating element having a launch means coupled from the transmission line inner conductor and extending beyond said transmission line outer conductor,

said radiating element dielectric impedance-matching means having a smooth tip for holding said launch means.

2. A microwave transducer as set forth in claim 1 wherein said light transmission means comprises first and second light guides and said observation means comprises an objective lens with the lens guide means passage being diametrically disposed as well as the first and second light guides.

3. A microwave transducer as set forth in claim 1 wherein said radiating element is used and operable for both cancer detection and cancer treatment.

4. A microwave transducer as set forth in claim 1 wherein said microwave transmitter and microwave radiometer operate at different frequencies.

5. A microwave transducer as set forth in claim 4 wherein the output heating frequency associated with the microwave transmitter is less than the detection passband frequency associated with the microwave radiometer.