Method for analyzing hemostasis

• US 8,236,568 B2
• Filed: 06/01/2007
• Issued: 08/07/2012
• Est. Priority Date: 04/24/2003
• Status: Active Grant

• Current Assignee: Haemonetics Corporation
• Original Assignee: Coramed Technologies, LLC (CORA Healthcare, Inc.)
• Inventors: Kautzky, Hans
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): COLE, MONIQUE T
• Application Number:
  US11/756,795
• Publication Number:
  US 20070224686A1
• Time in Patent Office: 1,894 Days
• Field of Search: 436/69, 73/644.1, 422/73
• US Class Current: 436/69
• CPC Class Codes: B01L 2300/024 Storing results with means integrated into the container
• CPC Class Codes: B01L 2300/0663 Whole sensors
• CPC Class Codes: B01L 2300/0809 rectangular shaped
• CPC Class Codes: B01L 3/508 rigid containers not provided for above
• CPC Class Codes: G01N 33/4905 Determining clotting time of blood by chemical methods G01N33/86, C12Q1/54

Abstract

A method and device for blood hemostasis analysis is disclosed. A blood sample is displaced to reach a resonant state. The resonant frequency of the blood sample is determined before, during and after a hemostasis process. The changes in the resonant frequency of the blood sample are indicative of the hemostasis characteristics of the blood sample.

Claims

1. A method for measuring hemostasis comprising:

providing a blood sample;

exciting the blood sample to a resonant state by displacing the blood sample to create movement in the blood sample;

observing the movement in the blood sample;

periodically determining a resonant frequency of the blood sample to provide a plurality of resonant frequencies of the blood sample; and

determining changes in the resonant frequencies of the blood sample over time, wherein the changes in the natural frequencies represent changes in the hemostasis characteristics of the blood sample over time.

2. A method according to claim 1, wherein displacing the blood sample to create movement comprises displacing the blood sample at a frequency, and incrementally varying the frequency until a resonant frequency of the blood sample is determined.

3. A method according to claim 1, wherein displacing the blood sample to create movement comprises displacing the blood sample incrementally varying the frequency from the resonant frequency to determine a plurality of resonant frequencies of the blood sample before, during and after hemostasis of the blood sample, wherein the plurality of the resonant frequencies are indicative of the hemostasis characteristics of the blood sample.

4. A method according to claim 1, wherein displacing the blood sample to create movement comprises displacing the blood sample with a frequency function having randomly selected frequency components selected from a range of frequencies;

and determining a plurality of resonant frequencies of the blood sample before, during and after hemostasis of the blood sample;

wherein the plurality of the resonant frequencies are indicative of the hemostasis characteristics of the blood sample.

5. A method according to claim 1, wherein displacing the blood sample to create movement comprises displacing the blood sample using a white noise function.

6. A method according to claim 1, wherein displacing the blood sample to create movement comprises displacing the blood sample to generate a time variant resonant response.

13. A method according to claim 1, further comprising determining changes in the modulus of elasticity of the blood sample over time based upon the plurality of resonant frequencies, wherein changes in the modulus of elasticity represent changes in the hemostasis characteristics of the blood sample over time.

7. A method for measuring hemostasis comprising:

placing a blood sample in a container having a portion transparent to an emission from a sensor;

displacing the container with an shaker to cause movement in the blood sample;

measuring the movement in the blood sample with a sensor receiving the emission indicative of the movement of the blood sample, wherein the emission contact at least a portion of the blood sample before being received by the sensor;

periodically determining a resonant frequency of the blood sample from the movement of the blood sample to provide a plurality of resonant frequencies of the blood sample; and

determining changes in the resonant frequencies of the blood sample over time, wherein the changes in the natural frequencies represent changes in the hemostasis characteristics of the blood sample over time.

8. A method according to claim 7, further comprising:

displacing the container at a frequency;

incrementally varying the frequency until a resonant frequency of the blood sample is determined; and

incrementally varying the frequency from the resonant frequency to determine a plurality of resonant frequencies of the blood sample before, during and after hemostasis of the blood sample;

wherein the plurality of the resonant frequencies are indicative of the hemostasis characteristics of the blood sample.

9. A method according to claim 7, further comprising:

displacing the container with a frequency function having randomly selected frequency components selected from a range of frequencies; and

determining a plurality of resonant frequencies of the blood sample before, during and after hemostasis of the blood sample;

wherein the plurality of the resonant frequencies are indicative of the hemostasis characteristics of the blood sample.

10. A method according to claim 7, wherein placing the blood sample in the container further comprises injecting the blood into the container through a self-sealing port on the container.

11. A method according to claim 7, wherein displacing the blood sample to create movement comprises displacing the blood sample using a white noise function.

12. A method according to claim 7, wherein displacing the blood sample to create movement comprises displacing the blood sample to generate a time variant resonant response.