Electroadhesive medical devices
A method and system for attaching medical devices to a patient are provided. In accordance with an embodiment, a medical device is formed with or is coupled to an attachment structure including a plurality of electrodes capable of generating differential voltages at adjacent electrodes, to thereby provide electrostatic adhesion with the tissue of a patient. In an embodiment, the attachment structure includes an insulative material between the respective electrodes of the plurality of electrodes.
1. A structure for attachment to a patient, comprising:
a pulse oximetry sensor; and
an attachment structure formed integrally with the pulse oximetry sensor or physically coupled to the pulse oximetry sensor, the attachment structure comprising:
a plurality of electrodes configured to generate differential voltages at adjacent electrodes, wherein the plurality of electrodes is constantly generating the differential voltages to attach the pulse oximetry sensor to the patient;
a power supply configured to supply a voltage that may be used or conditioned to generate the differential voltage at the adjacent electrodes; and
an insulative material between the respective electrodes of the plurality of electrodes.
2. The structure of claim 1 , comprising control circuitry configured to determine one or more of the magnitude and timing of the differential voltages applied at the adjacent electrodes.
3. The structure of claim 1 , comprising power conditioning configured to convert AC power to DC power, perform voltage smoothing, recover stored electrostatic energy, perform a voltage step-up of the differential voltages applied at the adjacent electrodes, or a combination thereof.
4. The structure of claim 1 , comprising an input structure configured to adjust the differential voltages applied at the adjacent electrodes or of turning the differential voltages on and off.
5. The structure of claim 1 , comprising a cable configured to attach the structure to one or more of a monitor or a therapeutic or treatment device.
6. The structure of claim 1 , wherein one or both of the pulse oximetry sensor and the attachment structure conform to the patient when attached to the patient.
7. A method, comprising:
positioning a pulse oximetry sensor on a tissue of a patient;
applying differential voltages to adjacent electrodes of an attachment structure of the pulse oximetry sensor such that the differential voltages generate an electrostatic attraction with the tissue;
securing the pulse oximetry sensor to the tissue using the electrostatic attraction, wherein the differential voltages are constantly applied to maintain the electrostatic attraction with the tissue.
8. The method of claim 7 , comprising adjusting the degree of electrostatic attraction using one or more input structures on the pulse oximetry sensor or in communication with the pulse oximetry sensor.
9. The method of claim 7 , wherein the tissue comprises skin tissue or mucosal tissue.
10. The method of claim 7 , wherein the pulse oximetry sensor, when secured, provides a clamping pressure of between about 0.5 N/cm 2 to about 1.5 N/cm 2 (about 0.8 lbs/in 2 to about 2.3 lbs/in 2 ).
11. The method of claim 7 , wherein the differential voltages are between about 500 V to about 10 kV.
12. The method of claim 7 , wherein the differential voltages are between about 2 kV to about 5 kV.
13. The method of claim 7 , comprising alternating the differential voltages applied to adjacent electrodes.
14. A pulse oximetry sensor, comprising:
a sensor body;
an emitter disposed on the sensor body;
a detector disposed on the sensor body and configured to detect light emitted by the emitter; and
an attachment structure formed integrally with the sensor body or attached to the sensor body, the attachment structure comprising:
a plurality of electrodes wherein the plurality of electrodes is configured to constantly generate differential voltages to secure the sensor body to the patient;
a power supply configured to supply a voltage that may be used or conditioned to generate the differential voltage at the plurality of electrodes; and
an insulating material disposed between each of the respective electrodes of the plurality of electrodes.
15. The pulse oximetry sensor of claim 14 , wherein the plurality of electrodes is configured to generate differential voltages at adjacent electrodes.
16. The pulse oximetry sensor of claim 14 , wherein the sensor body comprises a bandage-style sensor body or a clip-style sensor body.
17. The pulse oximetry sensor of claim 14 , comprising one or more of, control circuitry, power conditioning circuitry, or an input structure that affect a voltage applied to the plurality of electrodes.