Finger clip pulse oximeter

• US 5,792,052 A
• Filed: 09/19/1995
• Issued: 08/11/1998
• Est. Priority Date: 06/29/1994
• Status: Expired due to Term

• Current Assignee: Nonin Medical Incorporated
• Original Assignee: Nonin Medical Incorporated
• Inventors: Johnson, Timothy L., Isaacson, Philip O., Gadtke, David W.
• Primary Examiner(s): Bahr, Jennifer
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US08/530,413
• Time in Patent Office: 1,057 Days
• Field of Search: 600/310, 600/322, 600/323, 600/324, 600/326, 600/334, 600/340, 600/344, 600/473, 600/476, 356/39-41
• US Class Current: 600/323
• 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 5/6826 Finger
• CPC Class Codes: A61B 5/6838 Clamps or clips

Abstract

An apparatus for measuring a physical parameter, such as the saturation percentage of oxygen in blood. The pulse oximeter is built into the finger clip, and therefore the device is small, lightweight and very portable, as well as more reliable.

Claims

1. Apparatus for measuring a blood oxygen saturation level of arterial blood inside a body portion, comprising:

gripping means for releasably gripping a finger, the gripping means comprising first and second housings interconnected by a pivot means which allows the first and second housings to pivot relative to one another to releasably grip a finger inserted between the first and second housings, the first and second housings being in electrical communication with each other;

electronic means for sensing and determining the blood oxygen saturation level of the arterial blood inside the gripped body portion, the electronic means being completely carried by the gripping means.

2. The apparatus of claim 1 further including a display means for displaying the sensed and determined blood oxygen saturation level, the display means being attached to the gripping means.

3. The apparatus of claim 2 wherein the gripping means is comprised of finger gripping means for releasably gripping a finger, and wherein the electronic means is a pulse oximeter means for sensing and determining the blood oxygen saturation.

4. The apparatus of claim 3 wherein the pivot means is also constructed and arranged to allow the first and second housings to separate from one another, and wherein the pivot means urges the two housings towards each other, thereby applying pressure to releasably grip a finger inserted between the first and second housings.

5. The apparatus of claim 4 wherein the pulse oximeter means is a transmissive type pulse oximeter comprising:

radiation emitting means for directing radiation of at least two discrete wavelengths through the arterial blood inside the finger, the radiation emitting means carried by the first housing;

photosensor means for intercepting radiation passing through the finger from the radiation emitting means, the photosensor means carried by the second housing;

computation means for determining the blood oxygen saturation level, connected to the photosensor means, the computation means carried by the second housing;

power means for providing power to the radiation emitting means and the display means, the power means carried by the first housing, and

electrical connector means for electrically interconnecting the first and second housings.

6. The apparatus of claim 5 including circuit means for controlling the radiation emitting means, carried by the second housing and electrically connected to the radiation emitting means by the electrical connector means.

7. The apparatus of claim 6 wherein the circuit means also controls the display means and where the display means is carried by the second housing.

8. The apparatus of claim 4 wherein the pulse oximeter means is a transmissive type pulse oximeter comprising:

radiation emitting means for directing radiation of at least two discrete wavelengths through the arterial blood inside the finger, the radiation emitting means carried by the first housing;

photosensor means for intercepting radiation passing through the finger from the radiation emitting means, the photosensor means carried by the second housing;

computation means for determining the blood oxygen saturation level, connected to the photosensor means, the computation means carried by the second housing;

power means for providing power to the radiation emitting means and the display means, the power means carried by the second housing, and

electrical connector means for electrically interconnecting the first and second housings.

9. The apparatus of claim 8 including circuit means for controlling the radiation emitting means, carried by the second housing and electrically connected to the radiation emitting means by the electrical connector means.

10. The apparatus of claim 9 wherein the circuit means also controls the display means and where the display means is carried by the second housing.

11. The apparatus of claim 4 wherein the pulse oximeter means is a reflective type pulse oximeter comprising:

radiation emitting means for directing radiation of at least two discrete wavelengths through the arterial blood inside the finger, the radiation emitting means carried by the first housing;

photosensor means for intercepting radiation reflected by the arterial blood inside the finger, the photosensor means carried by the first housing;

computation means for determining the blood oxygen saturation level, connected to the photosensor means, the computation means carried by the first housing;

power means for providing power to the radiation emitting means and the display means, the power means carried by the first housing.

12. The apparatus of claim 11 including circuit means for controlling the radiation emitting means, carried by the first housing and electrically connected to the radiation emitting means.

13. The apparatus of claim 12 wherein the circuit means also controls the display means and where the display means is carried by the first housing.

14. The apparatus of claim 4 wherein the pulse oximeter means is a reflective type pulse oximeter comprising:

radiation emitting means for directing radiation of at least two discrete wavelengths through the arterial blood inside the finger, the radiation emitting means carried by the second housing;

photosensor means for intercepting radiation reflected by the arterial blood inside the finger, the photosensor means carried by the second housing;

electrical connector means for electrically interconnecting the first and second housings;

computation means for determining the blood oxygen saturation level, connected to the photosensor means, the computation means carried by the first housing, and

power means for providing power to the radiation emitting means and the display means, the power means carried by the first housing.

15. The apparatus of claim 14 including circuit means for controlling the radiation emitting means, carried by the first housing and electrically connected to the radiation emitting means.

16. The apparatus of claim 15 wherein the circuit means also controls the display means and where the display means is carried by the first housing.

17. The apparatus of claim including transmission means transmitting the determined physical parameter to a remote display.

18. A pulse oximeter, comprising:

a housing having a portion of its outer surface contoured to receive a pad side of a finger pressed against the housing;

pulse oximeter means for sensing and determining a blood oxygen saturation level of the arterial blood inside the finger, the pulse oximeter means carried by the housing and further comprising;

radiation emitting means for directing radiation of at least two discrete wavelengths through the arterial blood inside the finger;

photosensor means for intercepting radiation reflected by the arterial blood inside the finger;

computation means for determining the blood oxygen saturation level, connected to the photosensor means;

power means for providing power to the radiation emitting means and a display means;

a display means carried by the housing for displaying the blood oxygen saturation level determined by the pulse oximeter means, and

non-mechanical automatic on/off means operatively connected to the pulse oximeter means which non-mechanically senses the presence of a body portion pressed against the housing and switches the pulse oximeter means from a low power state to a normal power state, whereby the pulse oximeter senses and determines the blood oxygen saturation level.

19. A pulse oximeter, comprising:

pulse oximeter means for sensing and determining a blood oxygen saturation level in the arterial blood in a body portion, the pulse oximeter means being in a normally low power state, and

non-mechanical automatic on/off means operatively connected to the pulse oximeter means which non-mechanically senses the presence of a body portion and switches the pulse oximeter means from a low power state to a normal power state, whereby the pulse oximeter means senses and determines the blood oxygen saturation level.

20. The pulse oximeter of claim 19 wherein the pulse oximeter means is constructed and arranged for sensing and determining the blood oxygen saturation level in the arterial blood of a finger.

21. The pulse oximeter of claim 19 in which the pulse oximeter means includes radiation emitting means and photosensor means for intercepting radiation emitted by the emitting means, and wherein the non-mechanical automatic on/off means emits radiation from the radiation emitting means at predetermined intervals and measures the radiation received by the photosensor means such that if the radiation received by the photosensor means drops a predetermined amount within a predetermined period of time the non-mechanical automatic on/off means switches the pulse oximeter to its normal power state to begin the pulse oximeter determination.