Method for stabilizing and removing tissue

• US 6,401,722 B1
• Filed: 11/18/1999
• Issued: 06/11/2002
• Est. Priority Date: 06/12/1998
• Status: Expired due to Term

• Current Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Original Assignee: Calypso Medical Technologies, Inc. (Siemens AG)
• Inventors: Krag, David N.
• Primary Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US09/442,793
• Time in Patent Office: 936 Days
• Field of Search: 606/20-26, 128/DIG.27, 128/898, 600/547, 600/549
• US Class Current: 128/898
• CPC Class Codes: A61B 18/02 by cooling, e.g. cryogenic techniques devices for cooling specific reflex points of the body within cell-life limits A61H39/06
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2090/374 NMR or MRI
• CPC Class Codes: A61B 2090/3908 Soft tissue, e.g. breast tissue
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 90/17 for soft tissue, e.g. breast-holding devices
• CPC Class Codes: Y10S 128/27 Cryogenic

Abstract

A method of stabilizing a tissue mass, using a system (8) that includes temperature sensors (10), a scanner (80), and a cryoprobe (220). The sensors provide temperature information with respect to a tissue portion adjacent thereto. The sensors include an identification (ID) code and an ID decoder. The ID decoder compares the sensor ID code to an ID code contained in an interrogation signal provided by the scanner. If the codes match, the sensor transmits the temperature information to the scanner, which processes and displays the temperature information in a humanly recognizable form. The method includes the step of inserting a cryoprobe into a tissue volume to be stabilized so that a portion of the cryoprobe projects therefrom. Then, the tissue volume is frozen while monitoring the size or temperature of the tissue volume. Freezing is terminated when the tissue volume is frozen (or reaches a first temperature level), and then removed while grasping the cryoprobe so as to stabilize the tissue volume.

Claims

1. A method of stabilizing and removing a tissue volume having a perimeter, the method comprising the steps of:

a. inserting a cryoprobe for freezing tissue in a tissue volume to be stabilized so that a portion of the cryoprobe projects from the tissue volume;

b. freezing the tissue volume with the cryoprobe commencing with regions adjacent the cryoprobe and moving outwardly away from the cryoprobe;

c. monitoring the temperature of the tissue volume adjacent a perimeter thereof during said freezing step;

d. terminating said freezing step when said temperature reaches a first temperature level; and

e. removing the tissue volume while grasping the cryoprobe so as to stabilize the tissue volume.

2. The method according to claim 1, further including the step, after said step d), of:

continuing monitoring said temperature and providing an alarm signal when said temperature reaches a second temperature level.

3. The method according to claim 2, wherein said first temperature level is higher than said second temperature level.

4. The method according to claim 1, further including the step, after said step c), of monitoring the temperature in a tissue portion at a location radially outward of the perimeter during said freezing step, as measured from a central location in the tissue volume.

5. The method according to claim 4, further including the step of providing an alarm signal when said temperature of said tissue portion at said location reaches a third temperature level.

6. A method according to claim 1, wherein in said step c), said temperature monitoring includes the steps of:

a. implanting a plurality of temperature sensors at or near the outer boundary, each of which has a unique identification code and provides a first signal containing information regarding the temperature of tissue adjacent thereto in response to receipt of a second signal containing an identification code that matches said unique identification code;

b. generating said information with each sensor;

c. iteratively interrogating said plurality of sensors with a plurality of second signals each having an identification code matching said unique identification code of one of said plurality of sensors; and

d. detecting said first signal from each sensor, each first signal containing said unique identification code and said information for said each sensor.

7. A method according to claim 6, wherein said temperature monitoring step further includes the step of:

a. displaying said temperature information for each sensor in a humanly recognizable representation.