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Method and Apparatus for Monitoring the Autonomous Nervous System of a Sedated Patient

a technology of autonomous nervous system and monitoring method, applied in the field of medical technology, can solve the problems of prior art solution not providing indications of pain/discomfort and awakening simultaneously, and does not provide an indication of lack of hypnotics due to awakening

Active Publication Date: 2009-09-17
MED STORM INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a method and apparatus for monitoring the autonomous nervous system of a sedated patient to indicate pain / discomfort and awakening. The method measures skin conductance variations due to emotional sweating, which is a more accurate and precise means of monitoring the need for hypnotics and analgesics than measurements of blood pressure and heart rate. The apparatus provides reliable output indications."

Problems solved by technology

When used for monitoring a sedated patient, the prior art method may provide an indication of lack of analgesics, but it does not provide an indication of lack of hypnotics due to awakening.
Although this simple way of monitoring of the skin resistance value may give an indication of the person's attention, it would not provide an indication, which is satisfactorily reliable for use when monitoring the awakening of a sedated patient.
In particular, this prior art solution does not provide indications of pain / discomfort and awakening simultaneously.

Method used

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  • Method and Apparatus for Monitoring the Autonomous Nervous System of a Sedated Patient

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Embodiment Construction

[0023]FIG. 1 illustrates a block diagram for a preferred embodiment of an apparatus according to the invention. The apparatus is particularly arranged for the simultaneous detection of pain / discomfort reaction and awakening in a sedated patient. On an area 2 of the skin on a body part 1 of the patient, sensor means 3 are placed for measuring the skin's conductance. The body part 1 is preferably a hand or a foot, and the area 2 of the skin on the body part 1 is preferably the palmar side of the hand (in the palm of the hand) or the plantar side of the foot (under the sole of the foot). The sensor means 3 comprise contact electrodes where at least two electrodes are placed on the skin area 2. In a preferred embodiment the sensor means 3 consist of three electrodes: a signal electrode, a measuring electrode and a reference voltage electrode, which ensures a constant application of voltage over the stratum corneum (the surface layer of the skin) under the measuring electrode. The measur...

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Abstract

The invention relates to a method and an apparatus for monitoring the autonomous nervous system of a sedated patient. According to the method, skin conductance is measured through a time interval. Average skin conductance values and the number of fluctuation peaks are in the interval are calculated and analyzed, and an indication is given of the state of pain / discomfort in the patient as well as the state of awakening in the patient. The invention is particularly applicable for use with anaesthetized or artificially ventilated patents, as separate output signals are automatically provided, indicating the need for analgesics and hypnotics, respectively.

Description

TECHNICAL FIELD [0001] The invention relates in general to medical technology, and in particular to a method and an apparatus for monitoring the autonomous nervous system of a sedated patient. More specifically, the invention relates to a method and an apparatus for concurrently indicating the possible state of pain / discomfort and the possible state of awakening of a sedated patient, based on measurements of the patient's skin conductance. BACKGROUND OF THE INVENTION [0002] In the field of medical technology there is a problem in producing physical measurements representing the activity in an individual's autonomous nervous system, i.e. in the part of the nervous system, which is beyond the control of the will. Particularly, there is a special need to monitor the autonomous nervous system of a sedated, non-verbal patient, e.g. a patient in anaesthesia or an artificially ventilated patient, in order to detect if the patient needs more analgesics due to pain / discomfort stimuli or hypn...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B33/00A61B5/05A61B5/053C09K5/16A61B5/11A61B5/16A61M16/00A61M16/01C09K5/18C25B5/00
CPCA61B5/0531A61B5/1106A61B5/4035C09K5/18A61B5/4821A61B5/4824A61B5/412
Inventor STORM, HANNE
Owner MED STORM INNOVATION
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