Patent US4243046A successfully refreshed from Google Patents.
US4243046A
Expired / Lapsed
US
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V Lead extender for ECG
Assignee: Individual
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Filing: 1979-08-06
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Granted: 1981-01-06
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Expires: 1999-08-06
Abstract
Abstract An auxiliary rotary selector switch is provided, preferably conveniently near a standard single-channel ECG instrument. The V lead of the instrument is connected to one end of the center conductor of a coaxial cable, the opposite end of which is connected to the center contact of the auxiliary switch. Each of several stationary switch contacts is connected to a conductor of an auxiliary patient cable, the opposite ends of the conductor being attached to a corresponding number of V electrodes spaced across the chest of the patient. By oscillating the center contact, separate V readings, one for each of the chest electrodes may be recorded. The extender is actually connected to the ECG instrument when the selector switch of that instrument is turned to the V lead position, and the signals from the plural V electrodes are recorded serially on the chart as the auxiliary selector switch is turned.
Inventors
- 👤 Belson J. Weinstein
- 👤 Bruce H. Hyndman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:51
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/304; A61B5/307; A61B5/308
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
211 words
Apparatus for extending the V lead of an ECG instrument of the single channel type having a driven chart, a stylus for marking characteristic electrocardiographs on said chart, a plurality of lead wires connected to said instrument, including a single "V" lead, means for attaching the distal of at least some of said leads to the skin of a patient, electrical means for supplying voltage to said leads and also for driving said stylus and a first selector switch for serially connecting said leads to said instrument, said first switch having a "V" position connecting said "V" lead to said instrument, the improvement which comprises a conductor, means for connecting said V lead to said conductor, a second selector switch having a movable central contact connected to said conductor and a plurality of stationary contacts, a plurality of auxiliary patient leads, each said auxiliary lead being connected at a first end to one of said stationary contacts and at its distal to second means for attachment to the skin of said patient at a plurality of V positions, whereby when said instrument first selector switch is at "V" position, by serially turning said movable central contact readings at each of said plurality of V positions may be obtained on said chart.
Claim 2
Dependent Claim
211 words
Apparatus for extending the V lead of an ECG instrument of the single channel type having a driven chart, a stylus for marking characteristic electrocardiographs on said chart, a plurality of lead wires connected to said instrument, including a single "V" lead, means for attaching the distal of at least some of said leads to the skin of a patient, electrical means for supplying voltage to said leads and also for driving said stylus and a first selector switch for serially connecting said leads to said instrument, said first switch having a "V" position connecting said "V" lead to said instrument, the improvement which comprises a conductor, means for connecting said V lead to said conductor, a second selector switch having a movable central contact connected to said conductor and a plurality of stationary contacts, a plurality of auxiliary patient leads, each said auxiliary lead being connected at a first end to one of said stationary contacts and at its distal to second means for attachment to the skin of said patient at a plurality of V positions, whereby when said instrument first selector switch is at "V" position, by serially turning said movable central contact readings at each of said plurality of V positions may be obtained on said chart.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1 in which said conductor is the central wire of a coaxial cable which has a shield and in which said instrument has a floating ground, said shield being connected to said floating ground.
Claim 4
Dependent Claim
107 words
Apparatus according to claim 2 in which said second selector switch has a second deck having a second movable contact connected to move with said first-mentioned movable contact and a second set of a plurality of second stationary contacts consisting of dummy contacts unconnected to any element other than said second movable contact and active stationary contacts, said active contacts being connected to said floating ground, said second movable contact being connected to a source of DC power in said instrument, whereby, when said first movable contact is not connected to one of said first-mentioned stationary contacts, said source of power is connected to said floating ground.
Claim 5
Dependent Claim
50 words
Apparatus according to claim 1 whereby said auxiliary patient leads consist of a first section comprising a multi-conductor cord and a first plug member and a second section comprising a second plug member engageable with said first plug member and a plurality of leads extending from said second plug member.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 4 which further comprises a belt to encircle to waist of the patient and means to support said second plug member from said belt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |