Variable pressure reusable sensor

• US 7,254,434 B2
• Filed: 10/13/2004
• Issued: 08/07/2007
• Est. Priority Date: 10/14/2003
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Al-Ali, Ammar, Mason, Eugene, Schulz, Christian
• Primary Examiner(s): WINAKUR, ERIC FRANK
• Application Number:
  US10/965,394
• Publication Number:
  US 20050085704A1
• Time in Patent Office: 1,028 Days
• Field of Search: 600/309, 600/310, 600/322, 600/323, 600/344
• US Class Current: 600/344
• CPC Class Codes: A61B 2562/146 for optical coupling
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor

Abstract

A variable pressure reusable sensor has a first jaw having a first hinge and an emitter and an opposing second jaw having a second hinge and a detector. A pin is disposed through the first and second hinges so as to rotatably attach the first and second jaws. The jaws are adapted to attach to a tissue site so that the emitter transmits optical radiation into the tissue site and the detector receives optical radiation after absorption by the tissue site. A spring having a plurality of legs is disposed around the pin and configured so that the legs apply force to the jaws. A tensioner is disposed proximate at least one of the jaws and configured to variably position at least one of the legs so as to adjust pressure exerted by the jaws on the tissue site.

Claims

1. A variable pressure noninvasive pulse oximeter reusable sensor comprising:

a first jaw having a first hinge and an emitter;

an opposing second jaw having a second hinge and a detector;

a pin disposed through said first and second hinges so as to rotatably attach said first and second jaws to form a sensor clip;

said jaws adapted to attach to a tissue site so that said emitter transmits optical radiation into said tissue site and said detector receives said optical radiation after absorption by said tissue site;

a spring having a plurality of legs, said spring disposed around said pin and configured so that said legs apply force to said jaws; and

a tensioner disposed proximate at least one of said jaws and configured to cause said spring to exert variable pressure through said jaws on said tissue site responsive to varying tensioner positions or configurations with respect to said spring.

2. The reusable sensor according to claim 1 wherein said tensioner comprises plurality of slots each configured to hold at least one of said legs in a corresponding one of a plurality of leg positions that determine the tension in said spring.

3. The reusable sensor according to claim 2 wherein:

said slots are disposed on said first jaw, said spring has a center leg and two end legs, said center leg is positioned in one of said slots, and said end legs are positioned against said second jaw.

4. The reusable sensor according to claim 1 wherein said tensioner comprises slidable wall configured to retain at least one of said legs, said wall movable to a plurality of leg positions that determine the tension in said spring.

5. The reusable sensor according to claim 1 wherein said tensioner comprises wedge configured to support at least one of said legs, said wedge movable to a plurality of leg positions that determine the tension in said spring.

6. The reusable sensor according to claim 1 further comprising a screw retained by one of said jaws, said screw in mechanical communications with said tensioner so as to adjust said tensioner as said screw is turned.

7. The reusable sensor according to claim 1 further comprising a thumb switch retained by and protruding from one of said jaws, said thumb switch adapted to release and adjust said tensioner.

8. A method of attaching a variable pressure noninvasive pulse oximetry reusable sensor to a tissue site of a patient, the method comprising the steps of:

providing a noninvasive pulse oximetry sensor clip having an open position for inserting and removing a tissue site and a closed position for attaching said clip to said tissue site;

adjusting the force exerted against said tissue site to a desired level;

urging said clip to said closed position against said tissue site at said desired level of force.

9. The variable tension reusable sensor method according to claim 8 wherein said adjusting of said clip comprises the substeps of:

selecting a spring from a spring set; and

incorporating said spring into said clip.

10. The variable tension reusable sensor method according to claim 8 wherein said adjusting of said clip comprises the substeps of:

selecting a predetermined number of springs of a spring type; and

incorporating said springs into said clip.

11. The variable tension reusable sensor method according to claim 8 wherein said adjusting of said clip comprises the substep of adjusting a tensioner.

12. The variable tension reusable sensor method according to claim 11 wherein said adjusting substep comprises the substeps of:

selecting a particular slot from a plurality of slots fixedly attached to a first jaw; and

placing a spring leg into said particular slot.

13. The variable tension reusable sensor method according to claim 11 wherein said adjusting substep comprises the substeps of:

capturing a spring leg with a retaining wall; and

adjusting the position of said wall.

14. The variable tension reusable sensor method according to claim 11 wherein said adjusting substep comprises the substeps of:

supporting a spring leg with a wedge; and

adjusting the position of said wedge.

15. The variable tension reusable sensor method according to claim 11 wherein said adjusting substep comprises the substep of pushing a switch on said sensor clip so as to release said tensioner.