System for measuring vital signs during hemodialysis
First Claim
1. A system for characterizing a patient comprising:
- a vital sign monitor, attached to the patient and configured to interface to a hemodialysis machine, comprising;
a sensor configured to be worn on the patient'"'"'s finger, the sensor comprising an optical sensor comprising a light source and a photodetector for measuring an optical waveform from the patient;
a first electrode, configured to be worn on the patient'"'"'s body and to measure a first electrical signal from the patient;
a second electrode, configured to be worn on the patient'"'"'s body and to measure a second electrical signal from the patient;
an electrical circuit configured to receive the first and second electrical signals and amplify and process them to generate an electrical waveform;
a processing module configured to process;
i) the optical waveform and the electrical waveform to determine a time difference between features in these waveforms; and
ii) a blood pressure calibration and the time difference to determine a blood pressure value;
a first transmission system for transmitting blood pressure values to the hemodialysis machine when the patient is connected to the hemodialysis machine; and
a second transmission system for transmitting information to a remote receiver when the patient is disconnected from the hemodialysis machine.
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Accused Products
Abstract
The invention provides a system for continuously monitoring a patient during hemodialysis. The system includes a hemodialysis machine for performing the hemodialysis process that features a controller, a pump, a dialyzer filter, a lumen, and an interface to a body-worn monitor. A patient attaches to the dialysis machine through the lumen, and wears a body-worn monitor for continuously measuring blood pressure. The monitor includes an optical system for measuring an optical waveform, an electrical system for measuring an electrical waveform, and a processing component for determining a transit time between the optical and electrical waveforms and then calculating a blood pressure value from the transit time. The body-worn monitor features an interface (e.g. a wired serial interface, or a wireless interface) to transmit the blood pressure value to the controller within the hemodialysis machine. The controller is configured to receive the blood pressure value, analyze it, and in response adjust the dialysis process.
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Citations
20 Claims
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1. A system for characterizing a patient comprising:
a vital sign monitor, attached to the patient and configured to interface to a hemodialysis machine, comprising; a sensor configured to be worn on the patient'"'"'s finger, the sensor comprising an optical sensor comprising a light source and a photodetector for measuring an optical waveform from the patient; a first electrode, configured to be worn on the patient'"'"'s body and to measure a first electrical signal from the patient; a second electrode, configured to be worn on the patient'"'"'s body and to measure a second electrical signal from the patient; an electrical circuit configured to receive the first and second electrical signals and amplify and process them to generate an electrical waveform; a processing module configured to process;
i) the optical waveform and the electrical waveform to determine a time difference between features in these waveforms; and
ii) a blood pressure calibration and the time difference to determine a blood pressure value;a first transmission system for transmitting blood pressure values to the hemodialysis machine when the patient is connected to the hemodialysis machine; and a second transmission system for transmitting information to a remote receiver when the patient is disconnected from the hemodialysis machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification