Skin perfusion evaluation apparatus and method

• US 5,769,784 A
• Filed: 11/27/1995
• Issued: 06/23/1998
• Est. Priority Date: 11/27/1995
• Status: Expired due to Fees

• Current Assignee: Hill-Rom Services Incorporated (Baxter International Inc.)
• Original Assignee: Hill-Rom Incorporated (Baxter International Inc.)
• Inventors: Sutton, William T., Thomas, James M. C., Barnett, Richard I., Ozarowski, Ryszard S.
• Primary Examiner(s): Lacyk, John P.
• Assistant Examiner(s): CARTER, RYAN CHRISTOPHER
• Application Number:
  US08/562,781
• Time in Patent Office: 939 Days
• Field of Search: 128/630, 128/632, 128/634-636, 128/654, 128/664-666, 128/691, 128/736, 128/742
• US Class Current: 600/300
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/026 Measuring blood flow A61B3/1233, A61B3/1241 take precedence
• CPC Class Codes: G01K 3/14 in respect of space

Abstract

An apparatus and method for evaluating perfusion adjacent a skin surface includes the steps of measuring a reference rate of perfusion of the skin surface, storing the reference rate of perfusion, and applying a positive force to the skin surface. The apparatus and method also includes the steps of measuring a second rate of perfusion adjacent the skin surface after the positive force is applied, and calculating a differential rate of perfusion between the reference rate of perfusion and the second rate of perfusion after positive force is applied to provide an indication of perfusion adjacent the skin surface. The apparatus and method further includes the step of displaying the indication of perfusion.

Claims

1. A method for evaluating perfusion adjacent a skin surface, the method comprising the steps of:

applying a positive force to a first zone of the skin surface;

applying a negative force to a second zone of the skin surface;

measuring a rate of perfusion in the first zone;

measuring a rate of perfusion in the second zone; and

calculating a differential rate of perfusion between the first and second zones of the skin surface to provide an indication of perfusion adjacent the skin surface.

3. The method of claim 1, further comprising the step of displaying the indication of perfusion.

4. The method of claim 1, wherein the second zone of the skin surface surrounds the first zone.

5. The method of claim 1, wherein the first and second zones of the skin are spaced apart from each other.

6. The method of claim 1, further comprising the step of heating the first and second zones of the skin surface to a base temperature prior to the applying steps.

7. The method of claim 1, further comprising the step of cooling the first and second zones of the skin to a base temperature before the applying steps.

2. The method of claim 14, wherein the step of measuring the rate of perfusion in the first zone includes the step of measuring a temperature of the skin surface in the first zone, the step of measuring the rate of perfusion in the second zone includes the step of measuring a temperature of the skin surface in the second zone, and wherein the step of calculating a differential rate of perfusion includes the step of calculating a differential temperature between the first and second zones of the skin surface.

8. A method for evaluating perfusion adjacent a skin surface, the method comprising the steps of:

measuring a reference temperature of the skin surface;

storing the reference temperature;

applying a positive compressive force to the skin surface;

measuring a temperature of the skin surface after the positive compressive force is applied; and

calculating a differential temperature between the reference temperature and the temperature after the positive compressive force is applied to provide an indication of perfusion adjacent the skin surface.

9. The method of claim 8, further comprising the step of displaying the indication of perfusion.

10. A method for evaluating perfusion adjacent a skin surface, the method comprising the steps of:

measuring a reference rate of perfusion of the skin surface;

storing the reference rate of perfusion;

applying a positive compressive force to the skin surface;

measuring a second rate of perfusion adjacent the skin surface after the positive compressive force is applied; and

calculating a differential rate of perfusion between the reference rate of perfusion and the second rate of perfusion after positive compressive force is applied to provide an indication of perfusion adjacent the skin surface.

11. The method of claim 10, further comprising the step of displaying the indication of perfusion.