Abstract:
A novel biomedical electrode comprising: 1) a non-conductive backing layer (1) with instructions printed on one surface, 2) an ink layer (7, 8) having either a) an ink comprising silver and silver salt, or b) a blend of inks including a first ink comprising silver and silver salt and a second ink comprising an inert carbon based material printed in a pattern onto the second surface of the non-conductive backing layer (1), 3) a conductive-adhesive electrolyte layer (10) coated directly onto the inked surface of the non-conductive backing layer (1), and 4) a protective release liner (13) which covers the conductive adhesive layer (10). Certain preferred embodiments correspond to situation wherein the body parts being monitored display diverse impedances. In those embodiments, parameters such as ink blend, ink amount (i.e., ink thickness and ink pattern) are varied in order to vary the impedance of a given electrode.
Abstract:
A combination catheter for both detecting monophasic action potentials and ablating surface tissue in an in vivo heart of a patient is provided. The apparatus includes a catheter probe having a terminal tip portion (10) and an electrode (20) carried on the tip such that a portion of the tip electrode (20) is exposed to ambient. A reference electrode (50) is spaced along the tip from the first electrode for supplying a reference potential signal. An ablating electrode (30) is located adjacent to but electrically insulated from both the tip (20) and reference (50) electrodes for providing electromagnetic energy to the tip. The electrodes are electrically connected to the proximal end of the catheter through individual conductors or wires (22, 32 and 50) that run through an insulated cable. An electronic filter is provided to permit the recording of MAPs during ablation without radiofrequency interference. The catheter may also include standard mapping and/or pacing electrodes (80) and (75) respectively. The catheter may further include a steering mechanism for positioning the catheter at various treatment sites in the heart, and a structure for holding the tip electrode in substantially perpendicular contact with heart tissue with a positive pressure, and for spacing the reference electrode from the heart tissue.
Abstract:
In a brain wave detecting system, in one embodiment, a flexible hat (10) is placed on the head of the patient. The hat (10) contains a plurality of electrodes (12) conforming to the hat (10). A circuit board (34) having a low-noise integrated circuit amplifier may be mounted thereon. Each electrode (12) uses a plurality of metal conductive fingers which protude through the hair to the scalp and provide multi-contact sites on the scalp for each electrode (12). The tips of each electrode (12) contact the user's scalp to provide a redundancy of contacts for each electrode (12).
Abstract:
Apparatus for mounting electrodes (10) on a human body in order to obtain human biosignals is disclosed. The apparatus includes close fitting clothing apparatus (70), a plurality of electrodes (10) mounted to the close fitting clothing apparatus (70), removable cover sheet (12) apparatus for providing a sterile interface between the skin and at least one of the electrodes and joining apparatus for joining the removable cover sheet apparatus to at least one of the plurality of electrodes. A variety of applications of the apparatus are also disclosed, including apparatus for detecting drowsiness in a subject and for alerting the subject as a result and a fetal biosignal probe.
Abstract:
A device for determining the probability of death in cardiovascular patients including an electrocardiograph adapted to deliver a signal in the form of an electrical waveform containing information about the condition of the patient's heart; a waveform recognition and measurement device adapted to analyze the waveform and generate output based on the analysis; and a computer adapted to receive the output and calculate a numerical value representing the probability based on the output. Also provided is a method for assessing cardiovascular mortality risk at a health care facility or provider using this device.
Abstract:
A heart monitoring device (10) for use under emergency conditions including a portable housing, a pair of electrodes (20) and a pair of electrical wires (22) connecting the electrodes to the housing and to an electrical circuit carried therein. The electrodes are usable in two modes. One mode is a precordial mode wherein the electrodes are mounted on the exterior of the housing in commonly outwardly facing relation so as to be conveniently engageable with the skin of the chest of a user by manually engaging the housing and moving it with the electrodes fixed thereto into housing retained operative positions on the chest skin. The second mode is a non-precordial mode wherein the electrodes are removed from the housing and, preferably, self-retained within the armpits.
Abstract:
Apparatus (20) is disclosed for use with one or more subjects simultaneously, for causing an output device (30) to perform productive functions, such as various types of movement of an object, in response to the subject's movement between various brainwave states and combinations of brainwave states. When more than one subject is involved, the apparatus can generate an output signal indicating when all the subjects are producing a predetermined brainwave pattern simultaneously, when they are producing a predetermining brainwave pattern synchronously; when they are producing a predetermined brainwave pattern coherently; or when, during a preceding predetermined interval of time, each of the subjects individually produced a predetermined brainwave pattern for more than a predetermined percentage of the interval of time.
Abstract:
A method for analysing an electro-encephalogram (EEG) and apparatus for implementing the method are described. Preferably EEG's from the left and right sides of the head are analysed together. An EEG is analysed by detecting the bursts of activity having amplitudes which exceed a threshold voltage and each burst of activity in the EEG is determined to have ended when it is followed by a quiescent period below the threshold voltage having a duration of, say, at least 6 seconds. The total time of all quiescent periods occurring within an epoch, for example, 10 minutes is then calculated and displayed. The apparatus may include a digital computer for effecting statistical analysis of the total times for many consecutive epochs. The computer may also be used in generating the total times. A graphical output representing the total times may be produced enabling the progress of a patient to be assessed rapidly.
Abstract:
The system (10) includes a main (12) and a background gamma radiation detector (14) provided in a vestlike garment (16) worn by a patient during a prescribed period of time. Also included is an apparatus and method for determining the exact location of the left ventricle of the heart and positioning and maintaining the main radiation detector (12) relative to the left ventricle, during an ambulatory study period. Information from detectors (10) and (12), as well as ECG electrodes is electronically processed and recorded on a portable cassette recorder, and may thereafter be presented to the memory of a stand alone computer (92), which calculates and displays R-R time intervals, electrocardiogram and time-activity curves, and other physiological data. From the computer calculations the average heart rate, number of aberrant beats, left ventricular ejection fraction, relative cardiac blood volume and other physiological values may be determined.
Abstract:
This invention relates to a terminal electrode device for an electrocardiograph or an electroencephalograph, which can be used in a bath. The device comprises a disposable terminal electrode (A) and a connector (B) which can be attracted to the terminal electrode (A) by force of a permanent magnet. The terminal electrode (A) has a case (2) for accommodating an electrode (1a), an electrode base (1) and a sponge (5) associated with the electrode, a ring-like water-proof sheet (37) on the lower surface, and a sticking sheet (3) in the outer circumferential portion having air-permeability and water-permeability. The device is stuck to the human body by the sticking sheet (3) and the water-proof sheet (37) protects the electrode (1a) from water. The connector (B) has a connector body (13) containing a lead wire (11) that electrically couples to the electrode (1a) when attracted by the permanent magnet. Water-proof sealing members (7, 16) are provided in the contact portion between the connector member (13) and the case (2) of the terminal electrode (A), so that water will not infiltrate into the connector (B).