Impedance bootstrap circuit for an interface of a monitoring device
AssigneeStryker Corporation
InventorRandall Jeffrey Krohn
Life of this patent
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Abstract
An interface for receiving electrical signals representative of a condition of a patient and for conveying representations of the electrical signals to a processing system. The interface includes at least one amplifier circuit configured to alter an amplitude of the electrical signal, a common-mode cancellation amplifier circuit coupled to the at least one amplifier circuit and configured to reduce common-mode signal noise in the electrical signals, and a bootstrap circuit coupled to the at least one amplifier circuit and configured to increase an effective input impedance at an input of the at least one amplifier circuit.
Claims17
An interface being connectable between a processing system and a sensor being attachable to a patient, said interface comprising:
- a circuit being configured to detect an error condition comprising at least one of (1) the sensor being disconnected from said interface and (2) the sensor being detached from the patient, the circuit includes an amplifier including inputs and wherein a path is defined between the sensor and said amplifier and wherein said circuit detects said error condition by monitoring impedance of said path, wherein said circuit is configured to actively provide a feedback condition recognizable by the processing system in response to detecting that said error condition is present such that the processing system generates an indication being informative of said error condition;
- and
- a bootstrap circuit coupled to said inputs of said amplifier and wherein said circuit further provides said feedback condition by increasing an effective input impedance at said inputs of said amplifier using said bootstrap circuit in response to determining that said error condition is present.
An interface being connectable between a processing system and a sensor being attachable to a patient, said interface comprising:
- a circuit being configured to detect an error condition comprising at least one of (1) the sensor being disconnected from said interface and (2) the sensor being detached from the patient, the circuit includes an amplifier including inputs and wherein a path is defined between the sensor and said amplifier and wherein said circuit detects said error condition by monitoring impedance of said path, wherein said circuit is configured to actively provide a feedback condition recognizable by the processing system in response to detecting that said error condition is present such that the processing system generates an indication being informative of said error condition, said circuit further provides said feedback condition by driving said inputs of said amplifier above a predetermined maximum input range of said amplifier in response to determining that said error condition is present.
A method of operating a system including a processing system, a sensor being attachable to a patient, and an interface being connectable between the processing system and the sensor, the method comprising:
- detecting with the interface an error condition comprising at least one of (1) the sensor being disconnected from the interface and (2) the sensor being detached from the patient;
- actively providing with the interface a feedback condition in response to detecting that the error condition is present;
- recognizing with the processing system the feedback condition;
- and
- generating with the processing system an indication being informative of the error condition, the circuit further comprises an amplifier including inputs and a path defined between the sensor and the amplifier and wherein the step of detecting the error condition further comprises monitoring impedance of the path, the step of providing the feedback condition further comprises increasing an effective input impedance at the inputs of the amplifier in response to determining that the error condition is present.
A method of operating a system including a processing system, a sensor being attachable to a patient, and an interface being connectable between the processing system and the sensor, the method comprising:
- detecting with the interface an error condition comprising at least one of (1) the sensor being disconnected from the interface and (2) the sensor being detached from the patient;
- actively providing with the interface a feedback condition in response to detecting that the error condition is present;
- recognizing with the processing system the feedback condition;
- generating with the processing system an indication being informative of the error condition, wherein the circuit further comprises an amplifier including inputs and a path defined between the sensor and the amplifier and wherein the step of detecting the error condition further comprises monitoring impedance of the path;
- and
- actively removing the feedback condition in response to detecting that the error condition is no longer present.
Dependencies are inferred from the claim text.