Manual and automatic probe calibration

• US 7,496,391 B2
• Filed: 01/13/2004
• Issued: 02/24/2009
• Est. Priority Date: 06/07/1995
• Status: Expired due to Fees

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Lepper, James M. Jr., Ragsdale, Charles Robert, Kiani, Massi E., Diab, Mohamed Kheir
• Primary Examiner(s): Winakur; Eric F
• Assistant Examiner(s): Berhanu; Etsub D
• Application Number:
  US10/757,279
• Publication Number:
  US 20040147824A1
• Time in Patent Office: 1,869 Days
• Field of Search: 600/300, 600/309, 600/310, 600/323
• US Class Current: 600/310
• CPC Class Codes: A61B 2562/08 Sensors provided with means for identification, e.g. barcodes or memory chips
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6838 Clamps or clips
• CPC Class Codes: G01J 2003/2866 Markers; Calibrating of scan
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0254 Spectrometers, other than colorimeters, making use of an integrating sphere
• CPC Class Codes: G01J 3/027 Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation
• CPC Class Codes: G01J 3/0275 making use of sensor-related data, e.g. for identification of sensor parts or optical elements
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/10 Arrangements of light sources specially adapted for spectrometry or colorimetry
• CPC Class Codes: G01N 2021/3144 for oxymetry
• CPC Class Codes: G01N 21/255 Details, e.g. use of specially adapted sources, lighting or optical systems
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 21/3151 using two sources of radiation of different wavelengths G01N21/33 - G01N21/39 take precedence
• CPC Class Codes: G01N 21/39 using tunable lasers
• CPC Class Codes: G01N 2201/0627 : Use of several LED's for spectral resolution

Abstract

Embodiments of the present disclosure include an oximeter sensor system including a reusable portion including a substantially rigid connector connected to an end of a cable. The substantially rigid connector includes an electronic element housing at least one electronic component of a probe. The system also includes a disposable portion including a flexible wrap comprising a substantially rigid connection port shaped to receive the substantially rigid connector in a releasably securable manner.

Claims

1. A system for monitoring a physiological parameter of a patient, the system comprising:

a physiological sensor operable to detect a physiological parameter, the physiological sensor comprising a first LED and an information element electrically connected to a common signal line, wherein the first LED operates in response to a drive signal on the common signal line, and the information element provides information data on the common signal line;

a physiological monitor, which provides the drive signal to the first LED and receives the information data from the information element; and

a connector, operable to provide communication between the physiological monitor and the common signal line of the physiological sensor.

2. The system of claim 1, wherein the physiological sensor further comprises a second LED that is electrically connected in a back-to-back configuration with the first LED and electrically connected to the common the signal line.

3. The system of claim 1, wherein the physiological monitor generates the drive signal having a first frequency and monitors the information data at a second frequency that is different from the first frequency;

4. The system of claim 1, wherein the information element provides the information data in response to a probe signal on the common signal line and the probe signal has a lower amplitude than the drive signal

5. The system of claim 4, wherein the amplitude of the probe signal is approximately 0.5 volts or less while the amplitude of the drive signal is approximately 1.5 volts or more.

6. The system of claim 4, wherein the drive signal and the probe signal have different operating frequencies.

7. The system of claim 4, wherein the first LED is effectively inactive in response to the probe signal.

8. The system of claim 1, wherein the physiological monitor comprises a processor that receives the information data and generates the drive signal in response to the information data.

9. A physiological monitor for monitoring a physiological parameter of a patient, the physiological monitor comprising:

a driver circuit operable to provide a drive signal in response to information data;

a common signal line on which the drive signal is provided and on which the information data is received; and

a connector, wherein the connector is in communication with the driver circuit and the common signal line.

10. The physiological monitor of claim 9, wherein the drive signal activates one or more light emitting diodes electrically connected to the common signal line.

11. The physiological monitor of claim 9,

wherein the drive signal operates at a first frequency and a signal having a second frequency that is different from the first frequency communicates the information data.

12. The physiological monitor of claim 9,

wherein the information data is provided to the common signal line in response to a probe signal on the common signal line and the probe signal has a lower amplitude than the drive signal.

13. The physiological monitor of claim 12, wherein the probe signal has a voltage amplitude that is less than one volt and the drive signal has a voltage amplitude that is greater than one volt.

14. The physiological monitor of claim 12, wherein the drive signal operates at a higher frequency than the probe signal.

15. The physiological monitor of claim 12, wherein the probe signal has an operating frequency that is less than 625 Hertz.

16. A physiological sensor which provides information to a physiological monitor in addition to at least one physiological signal usable to determine a physiological parameter of a patient, the physiological sensor comprising:

a common signal line which receives at least one LED drive signal from a physiological monitor;

at least one LED electrically connected to the common signal line and operating in response to the LED drive signal; and

an information element electrically connected to the common signal line and operable to provide information on the common signal line to the physiological monitor.

17. The physiological sensor of claim 16, wherein the information element effectively ceases to provide information to the physiological monitor on the common signal line when the LED drive signal has a sufficient amplitude to activate the LED electrically connected to the common signal line.

18. The physiological sensor of claim 16, wherein the information element provides information to the physiological monitor on the common signal line when the LED drive signal does not have a sufficient amplitude to drive the LED electrically connected to the common signal line.

19. The physiological sensor of claim 16, wherein the LED drive signal has a voltage amplitude that is greater than approximately 1.5 volts.

20. The physiological sensor of claim 16, wherein the information element comprises a passive element.

21. The physiological sensor of claim 20, wherein the passive element comprises a coding resistor.

22. The physiological sensor of claim 21, wherein the coding resistor comprises an impedance device.

23. The physiological sensor of claim 16, wherein the information element comprises an active element.

24. The physiological sensor of claim 16, wherein the information element comprises an active circuit.

25. The physiological sensor of claim 16, wherein the information element comprises a memory chip.

26. The physiological sensor of claim 16, wherein the information element comprises an identification device.

27. The physiological sensor of claim 16, wherein the information element comprises a transistor network.

28. The physiological sensor of claim 16, wherein the information provided by the information element is usable to identify a type of probe.

29. The physiological sensor of claim 28, wherein the type of probe comprises at least one of an adult probe, a pediatric probe, a neonatal probe, a disposable probe, and a reusable probe.

30. The physiological sensor of claim 16, wherein the information provided by the information element is usable for a security purpose.

31. The physiological sensor of claim 30, wherein the security purpose includes an indication that the physiological sensor is from an authorized supplier.

32. The physiological sensor of claim 16, wherein the information provided by the information element is usable to determine characteristics of the LED drive signal.

33. The physiological sensor of claim 32, wherein the characteristics include at least one operating wavelength of at least one LED.

34. The physiological sensor of claim 16, wherein the information element provides the information on the common signal line in response to a probe signal provided by the physiological monitor on the common signal line and the LED drive signal has a greater amplitude than the probe signal.

35. The physiological sensor of claim 34, wherein the LED drive signal has a voltage amplitude of approximately 1 .5 volts or more.

36. The physiological sensor of claim 34, wherein the probe signal has a voltage amplitude of approximately 0.5 volts or less.

37. A method of communicating between a physiological probe and a physiological monitor, the method comprising the steps of:

providing a drive signal from said physiological monitor to said physiological probe on a common a signal line, wherein the drive signal has a first range of operating frequencies; and

providing information data on the common signal line from an information element in the physiological probe to the physiological monitor, wherein the information data is encoded in a probe signal having a second frequency that is lower than the first range of operating frequencies for the drive signal.

38. The method of claim 37, further comprising the step of electrically connecting LED circuitry in the physiological probe to the common signal line.

39. The method of claim 37, further comprising the step of electrically connecting the information element in the physiological probe to the common signal line.

40. The method of claim 37, wherein said drive signal has a greater voltage amplitude than said probe signal.

41. The method of claim 37, wherein said physiological monitor further comprises a processor in communication with said common signal line, said processor providing said drive signal in response to said information data.