LIMB-WORN PATIENT MONITORING DEVICE

• US 20190239787A1
• Filed: 02/01/2019
• Published: 08/08/2019
• Est. Priority Date: 02/02/2018
• Status: Active Grant

• Current Assignee: Willow Laboratories Incorporated
• Original Assignee: Cercacor Laboratories
• Inventors: Pauley, Kevin Hughes, Vo, Hung The, Paul, Mathew
• Granted Patent: US 11,766,198 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 2562/0238 Optical sensor arrangements for performing transmission measurements on body tissue
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• 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 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02405 Determining heart rate variability
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6802 Sensor mounted on worn items
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6828 Leg
• CPC Class Codes: A61B 5/6838 Clamps or clips

Abstract

The present disclosure describes example systems, methods, apparatuses, and medical devices for obtaining physiological parameter data from a wearable patient monitoring device. An example patient monitoring device can include an emitter and a detector. The emitter can emit light through tissue of a patient. The detector can sense the light after it passes through and is attenuated by the tissue and can generate a signal indicative of the sensed light. When the patient monitoring device is attached to or worn by the patient, the emitter and detector are aligned such that the light from the emitter travels through an opening between a first bone and a second bone of the patient prior to being sensed by the detector.

Claims

1-48. -48. (canceled)

49. A wearable patient monitoring device comprising:

an emitter configured to emit light; and

a detector configured to sense the light after it passes through and is attenuated by tissue of a patient and to generate a signal indicative of the sensed light,

wherein, when the patient monitoring device is attached to the patient, the emitter and detector are aligned such that the light from the emitter travels through an opening between a first bone and a second bone of the patient prior to being sensed by the detector.

50. The wearable patient monitoring device of claim 49, wherein at least one of:

the tissue corresponds to a forearm of the patient, the first bone comprises a radial bone of the forearm, and the second bone comprises an ulna bone of the forearm;

or

the tissue corresponds to a lower leg of the patient, the first bone comprises a tibia bone of the lower leg, and the second bone comprises a fibula bone of the lower leg.

51. The wearable patient monitoring device of claim 49, further comprising a resilient member configured to exert a force on at least one of the emitter or the detector, wherein the force is in a direction of the tissue with respect to the at least one of the emitter or the detector.

52. The wearable patient monitoring device of claim 51 wherein the resilient member comprises a spring coupled to the at least one of the emitter or the detector.

53. The wearable patient monitoring device of claim 49, wherein the detector comprises a large area photodetector.

54. The wearable patient monitoring device of claim 49, wherein the emitter is a first emitter and the light is first light, the patient monitoring device further comprising a second emitter configured to emit second light towards the tissue, wherein the detector is configured to detect the second light after it is reflected, refracted, or both by the tissue and to generate a signal indicative of the sensed second light.

55. The wearable patient monitoring device of claim 54, further comprising a multiplexor configured to select between the first emitter and the second emitter, wherein the selection causes the selected one of the first emitter or the second emitter to turn on.

56. The wearable patient monitoring device of claim 54, wherein the second emitter consumes less energy to emit the second light than the first emitter consumes to emit the first light.

57. A wearable patient monitoring device comprising:

a transmission pulse oximetry system configured to emit first light and generate a first signal;

a reflective pulse oximetry system configured to emit second light and generate a second signal, wherein power consumed by the reflective pulse oximetry system to emit the second light is less than power consumed by the transmission pulse oximetry system to emit the first light; and

a processor in communication with the transmission pulse oximetry system and the transmission pulse oximetry system, the processor configured to determine a physiological parameter based at least in part on at least one of the first signal or the second signal.

58. The wearable patient monitoring device of claim 57, wherein the physiological parameter comprises at least first and second physiological parameters, wherein the processor is configured to determine the first physiological parameter based at least in part on the first signal, wherein the processor is configured to determine the second physiological parameter based at least in part on the second signal.

59. The wearable patient monitoring device of claim 57, wherein the first physiological parameter comprises at least one of blood oxygen saturation (SpO₂) or pulse rate (PR), and wherein the second physiological parameter comprises pulse rate variability (PRV).

60. The wearable patient monitoring device of claim 57, wherein the transmission pulse oximetry system comprises:

a first emitter configured to emit first light through tissue of a patient, and

a first detector configured to sense the first light after it passes through and is attenuated by the tissue and to generate the first signal, wherein the first signal is indicative of the sensed first light.

61. The wearable patient monitoring device of claim 57, wherein the transmission pulse oximetry system further comprises a lens, wherein at least a portion of the first light passes through the lens.

62. The wearable patient monitoring device of claim 57, wherein when the patient monitoring device is attached to the patient, the first emitter and the first detector are aligned such that the first light from the first emitter travels through an opening between a first bone and a second bone of the patient prior to being sensed by the first detector.

63. The wearable patient monitoring device of claim 57, wherein at least one of:

the tissue corresponds to a forearm of the patient, the first bone comprises a radial bone of the forearm, and the second bone comprises an ulna bone of the forearm;

or

the tissue corresponds to a lower leg of the patient, the first bone comprises a tibia bone of the lower leg, and the second bone comprises a fibula bone of the lower leg.

64. The wearable patient monitoring device of claim 57, wherein the reflective pulse oximetry system comprises:

a second emitter configured to emit second light to tissue of a patient, and

a second detector configured to sense the second light after it is reflected and/or refracted at the tissue and to generate second signal, wherein the second signal is indicative of the sensed second light.

65. A method comprising:

receiving a signal corresponding to a transmission pulse oximetry system of a wearable patient monitoring device, wherein the transmission pulse oximetry system comprises;

an emitter configured to emit light through tissue of a patient, and

a detector configured to sense the light after it passes through and is attenuated by the tissue and to generate the signal indicative of the sensed light,

wherein, when the wearable patient monitoring device is worn by the patient, the emitter and detector are aligned such that the light from the emitter travels through an opening between a first bone and a second bone of the patient prior to being sensed by the detector; and

determining a physiological parameter based at least in part on the signal.

66. The method of claim 65, wherein the signal is a first signal, the emitter is a first emitter, and the light is first light, the method further comprising:

receiving a second signal corresponding to a reflective pulse oximetry system of the wearable patient monitoring device, wherein the reflective pulse oximetry system comprises;

a second emitter configured to emit second light to the tissue of a patient, and

the detector, wherein the detector is further configured to sense the second light after it is reflected and/or refracted at the tissue prior to being received by the detector and to generate the second signal indicative of the sensed second light,

wherein said determining the physiological parameter is further based at least in part on the second signal.

67. The method of claim 65, wherein the second emitter consumes less energy when emitting the second light than the first emitter consumes when emitting the first light.

68. The method of claim 65, wherein the tissue corresponds to a forearm of the patient, wherein the first bone comprises a radial bone of the forearm and the second bone comprises an ulna bone of the forearm.