Electrode and magnetic connector assembly

• US 4,112,941 A
• Filed: 01/06/1977
• Issued: 09/12/1978
• Est. Priority Date: 01/06/1977
• Status: Expired due to Term

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Larimore, Frank C.
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US05/757,148
• Time in Patent Office: 614 Days
• Field of Search: 128/2.06 E, 128/2.1 E, 128/404, 128/410, 128/411, 128/416, 128/417, 128/418, 128/DIG. 4, 339/12 R, 339/12 G, 339/12 V, 339/45 R, 339/46
• US Class Current: 600/394
• CPC Class Codes: A61B 5/273 Connection of cords, cables or leads to electrodes
• CPC Class Codes: A61B 5/274 using snap or button fasteners
• CPC Class Codes: H01R 13/6205 Two-part coupling devices held in engagement by a magnet
• CPC Class Codes: Y10S 439/909 Medical use or attached to human body
• CPC Class Codes: Y10S 439/923 Separation or disconnection aid

Abstract

An improved biomedical electrode and connector assembly is disclosed wherein the connector contains a magnet to facilitate mating with an elongated upstanding contact member of the electrode. Electrical contact between the connector and the electrode occurs along some portion of the upstanding contact member so that a space or gap is formed between the connector and the electrode plate of the electrode. Apparatus whereby the connector may be intentionally disconnected with ease, but accidental disconnection is prevented, are also provided.

Claims

1. An electrode-connector assembly comprising:

an electrode comprising;

(1) a ferromagnetic electrode plate having an upper surface and a lower surface;

(2) an upstanding electrically conductive contact member firmly affixed to the upper surface of said electrode plate adapted to mate with the connector portion of said assembly;

(3) means for affixing the electrode plate to the surface of the skin with said contact member projecting away from the skin; and

(4) means for conducting electrical impulses between the skin and the electrode plate;

and a connector electrically and mechanically mated to said electrode, comprising;

(1) a magnet having an upper surface and a lower surface and side walls with a hole in said lower surface into which said upstanding contact member is releasably fitted so that said contact member electrically contacts said connector on some portion of said contact member and a space exists between said magnet and the upper surface of said electrode plate; and

(2) a lead wire electrically connected to said magnet.

2. The electrode-connector assembly according to claim 1 wherein said contact member further comprises an elongated cylindrical body portion and a beveled base portion affixed to the upper surface of said electrode plate, said beveled base portion providing the electrical contact portion between said connector and said contact member;

and wherein the diameter of said hole is larger than the diameter of said cylindrical portion and smaller than the diameter of said beveled base portion so that said connector contacts said beveled base portion.

3. The electrode-connector assembly according to claim 2 wherein the connector further comprises a ferromagnetic shell surrounding the side walls and upper surface of said magnet forming a cup magnet.

4. The electrode-connector according to claim 3 wherein the connector further comprises lifting means on said cup magnet to which mechanical force may be applied to disconnect said connector from said electrode, said lifting means being located on the side of said cup magnet opposite from the attachment of said lead wire and wherein a clearance is provided between said upstanding contact member and the wall of said hole on the side adjacent to said lifting means such that upward force on said lead wire causes the wall of said hole to intercept said upstanding contact member thereby preventing disconnection of said connector from said electrode, and upward force on said lifting means does not cause the wall of said hole to intercept said contact member thereby allowing disconnection of said connector from said electrode.

5. An electrode-connector assembly comprising:

an electrode comprising;

(1) a ferromagnetic electrode plate having an upper surface and a lower surface;

(2) an upstanding elongated electrically-conductive contact member firmly affixed to the upper surface of said electrode plate adapted to mate with the connector portion of said assembly;

(3) means for affixing said electrode plate to the surface of the skin with said contact member projecting away from the skin; and

(4) means for conducting electrical impulses between the skin and the electrode plate; and

a connector electrically and mechanically mated to said electrode comprising;

(1) a magnet having an upper surface and a lower surface with a hole in said lower surface into which said contact member is releasably fitted so that said contact member electrically contacts said magnet on some portion of said contact member;

(2) a lead wire electrically connected to said magnet;

(3) lifting means on said magnet to which mechanical force may be applied to disconnect said connector from said electrode, said lifting means being on the side of said magnet opposite the attachment of said lead wire; and

(4) wherein a clearance is provided between said upstanding contact member and the wall of said hole on the side adjacent to said lifting means such that upward force on said lead wire causes the wall of said hole to intercept said contact member thereby preventing disconnection of said connector from said electrode and upward force on said lifting means will not cause the wall of said hole to intercept said contact member and allows disconnection of said connector from said electrode.

6. An electrode comprising:

a ferromagnetic electrode plate having an upper surface and a lower surface;

an upstanding electrically-conductive contact member firmly affixed to the upper surface of said electrode plate having an elongated cylindrical body portion and an outwardly beveled base portion, said beveled base portion affixed to the upper surface of said electrode plate, and said base portion providing an electrical contact surface;

means for affixing the electrode plate to the surface of the skin with said contact member projecting away from the skin; and

means for conducting electrical impulses between the skin and the electrode plate.

7. A connector for mating with an electrode and transmitting electrical impulses therefrom comprising:

a magnet having an upper surface and a lower surface and side walls;

a ferromagnetic shell surrounding said side walls and upper surface of said magnet forming a cup magnet;

a lead wire electrically connected to said ferromagnetic shell; and

lifting means on said cup magnet to which mechanical force may be applied to disconnect said connector from the electrode , said lifting means being located on the side of said cup magnet opposite the attachment of the lead wire;

said cup magnet having a hole in the lower surface thereof for mating with the male portion of the electrode, said hole being formed so that when mated there is sufficient clearance between the wall of said hole and the male portion of the electrode on the side adjacent to said lifting means to lift off the connector from the male portion of the electrode by upward force on the lifting means, and clearance between the wall of the hole and the male portion of the electrode is such that upward force on the lead wire causes the wall of the hole to intercept the male portion of the electrode thereby preventing disconnection by upward force on said lead wire.