Hydration monitoring circuitry for pH sensors

• US 7,206,624 B2
• Filed: 05/25/2005
• Issued: 04/17/2007
• Est. Priority Date: 05/25/2005
• Status: Active Grant

• Current Assignee: Sierra Medical Technology
• Original Assignee: Sierra Medical Technology
• Inventors: Tsukashima, Ross, Wallner, Thomas Germain, Roucher, Leo R., Schipper, Jeffery D., Wolf, Erich H., Bankert, Charles S.
• Primary Examiner(s): Marmor, II; Charles A.
• Assistant Examiner(s): Natnithithadha; Navin
• Application Number:
  US11/137,459
• Publication Number:
  US 20060270936A1
• Time in Patent Office: 692 Days
• Field of Search: 600/300, 600/301, 600/302, 600/306, 600/307, 600/361, 600/345, 600/348, 73/290.1, 324/438
• US Class Current: 600/361
• CPC Class Codes: A61B 2560/0276 Determining malfunction
• CPC Class Codes: A61B 2562/02 Details of sensors specially adapted for in-vivo measurements
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes

Abstract

The present invention pertains to an apparatus for evaluating the signal strength from the pH sensor to determine whether the sensor is hydrated sufficiently to accurately measure pH. This is accomplished by utilizing circuitry that periodically sends a low voltage signal to a suitable pH sensor and then receiving the resulting waveforms which are analyzed by a processing receiver. The electrical connection between a suitable pH sensor and hydration monitoring circuitry is generally hard wired. In one embodiment, a processing receiver is coupled with the hydration monitoring circuitry as a single apparatus. In a second embodiment, the processing receiver can be independent and located remote from the hydration monitoring circuitry. In this embodiment, the hydration monitoring circuitry and the processing receiver are electrically connected using either hard wired techniques or wireless technology. In addition, the processing receiver can include data recording capability.

Claims

1. An apparatus for monitoring the hydration level of a pH sensor, said apparatus comprising:

a pH sensor;

a hydration monitoring circuit for monitoring the hydration level of said pH sensor and for outputting a waveform indicative of the hydration level;

an eletrically communication means between said hydration monitoring circuitry and said pH sensor; and

a processing receiver, said processing receiver in communication with said hydration monitoring circuitry.

2. The apparatus for monitoring the hydration level as recited in claim 1, further comprising that said processing receiver includes a data recorder.

3. The apparatus for monitoring the hydration level as recited in claim 1, wherein said hydration monitoring circuitry and said processing receiver is incorporated in a single apparatus.

4. The apparatus for monitoring the hydration level as recited in claim 1, wherein said hydration monitoring circuitry monitors said hydration level on a specified periodic frequency.

5. The apparatus for monitoring the hydration level as recited in claim 1, wherein said processing receiver is in real time communication with said hydration monitoring circuitry.

6. The apparatus for monitoring the hydration level as recited in claim 1, wherein said processing receiver is in wireless communication with said hydration monitoring circuitry.

7. The apparatus for monitoring the hydration level as recited in claim 6, wherein said wireless communication is conducted in real-time.

8. the apparatus for monitoring the hydration level as recited in claim 1, wherein said processing receiver has the capability to analyze the hydration level of a self-condensing sensor.

9. The apparatus for monitoring the hydration level as recited in claim 2, further comprising a removable data storage medium, said removable data storage designed to communicate with said processing receiver with data recorder, said removable data storage medium further designed to store recorded pH measurements monitored by said self-condensing pH sensor over a period of time.

10. The apparatus for monitoring of pH as recited in claim 1, wherein said processing receiver includes a visual or audible alarming means that is generated if the sensor is not sufficiently hydrated to provide reliable pH measurements.

11. The apparatus for monitoring of pH as recited in claim 1, wherein said processing receiver includes a visual or audible alarming means that is generated upon the occurrence of a specific waveform.

12. The apparatus for monitoring of pH as recited in claim 1, wherein said processing receiver includes a means for terminating the recording of pH data if said data shows a relatively high peak to peak reading indicating that the pH sensor is not providing reliable pH measurements.

13. An apparatus for monitoring the hydration level of a pH sensor, said apparatus comprising:

a hydration monitoring circuit;

a pH sensor;

an electrcally communication means between said hydration monitoring circuitry and said pH sensor; and

a processing receiver, said processing receiver in communication with said hydration monitoring circuitry; and

an algorithm to determine if said pH sensor is sufficiently hydrated to provide reliable pH measurements.