Electrical connector apparatus and methods

1. A low-cost simplified electrical connector adapted for use with biomedical patch-type electrodes having at least one button-shaped terminal, comprising:

a unitary substantially metallic spring element having:

first and second substantially opposing bias portions;

first and second connecting portions coupled to respective ones of said first and second opposing portions;

a variable geometry portion coupled to both said connecting portions and comprising a variable size aperture and a fulcrum portion, said aperture being configured to receive one of said button-shaped terminals when properly expanded; and

a housing element having first and second movable actuation elements, said movable actuation communicating with respective ones of said opposing portions;

wherein upon biasing at least one of said first and second movable actuation elements, said aperture expands in size; and

wherein upon unbiasing said at least one movable actuation elements, said aperture contracts in size due at least in part to spring force generated by said fulcrum portion.

2. An electrical connector, comprising:

a bias element having:

a movable portion and a stationary portion;

first and second connecting portions coupled to respective ones of said movable and stationary portions;

a variable geometry portion coupled to both said connecting portions and comprising a variable size aperture, said aperture being configured to receive a terminal; and

a housing element having a housing bias portion, said movable bias portion communicating with said movable portion of said bias element for providing proper antecedent basis;

wherein upon biasing said housing bias portion, said aperture expands in size.

3. The connector of claim 2 , wherein said movable and stationary portions are disposed substantially within a first plane, and said variable geometry portion is disposed substantially within a second plane, said first and second planes being substantially parallel.

4. The connector of claim 2 , wherein said movable and stationary portions are disposed substantially within a first plane, and said variable geometry portion is disposed substantially within a second plane, said first plane being disposed above said second plane relative to the direction of insertion of said terminal into said aperture.

5. The connector of claim 2 , wherein said bias element is formed from a single piece of electrically conductive metal.

6. The connector of claim 2 , wherein said terminal comprises a terminal selected from the group consisting of: (i) an ECG terminal and (ii) an ICG terminal.

7. An electrical connector, comprising:

a unitary spring element having:

first and second substantially opposing portions;

first and second connecting portions coupled to respective ones of said first and second opposing portions;

a variable geometry portion coupled to both said connecting portions and comprising a variable size aperture, said aperture being configured to receive a terminal when properly expanded; and

a housing element having first and second movable bias portions, said movable bias portions communicating with respective ones of said opposing portions;

wherein upon biasing at least one of said first and second bias portions, said aperture expands in size.

8. A low-force electrical connector, comprising:

a bias element having:

first and second substantially opposing portions adapted to move relative to one another;

first and second connecting portions coupled to respective ones of said first and second opposing portions;

an aperture portion coupled to both said connecting portions and comprising a variable size aperture, said aperture being configured to receive a terminal; and

a housing element substantially containing said bias element, said housing having an opening formed therein substantially coincident with said aperture;

wherein upon biasing said connector onto said terminal, said aperture at least temporarily expands in size to receive said terminal in a frictional engagement.

9. The connector of claim 8 , wherein said terminal comprises a substantially rounded head region, and said aperture portion is configured to cooperate with said head region to cause said expansion of said aperture during said act of biasing.

10. The connector of claim 9 , wherein said configuration of said aperture portion comprises providing said aperture portion of said bias element with a substantially rounded profile, said rounded profile cooperating with said substantially rounded head to minimize friction during said expansion.

11. The connector of claim 8 , wherein said bias element is adapted such that said act of biasing said connector onto said terminal causes said first and second substantially opposing portions to become closer to one another.

12. The connector of claim 8 , wherein said act of biasing said connector onto said terminal is accomplished without any inward external bias force being applied to either of said substantially opposing portions.

13. The connector of claim 1 , wherein said movable actuation elements are disposed substantially within a first plane, and said variable geometry portion is disposed substantially within a second plane, said first and second planes being substantially parallel.

14. The connector of claim 1 , wherein said movable actuation elements are disposed substantially within a first plane, and said variable geometry portion is disposed substantially within a second plane, said first plane being disposed above said second plane relative to the direction of insertion of said terminal into said aperture.

15. The connector of claim 1 , wherein said terminal comprises a terminal selected from the group consisting of: (i) an ECG terminal and (ii) an ICG terminal.

16. The connector of claim 1 , wherein said terminal comprises a substantially rounded head region, and said aperture portion is configured to cooperate with said head region to assist said expansion of said aperture during said act of biasing, and when a normal force is contemporaneously applied to said connector.

17. The connector of claim 16 , wherein said unitary substantially metallic spring element comprises a substantially rounded cross-sectional profile, said substantially rounded profile cooperating with said substantially rounded head to minimize friction during said biasing and application of said normal force.

18. The connector of claim 1 , wherein said unitary substantially metallic spring element is adapted such that said act of biasing causes said first and second substantially opposing bias portions to become closer to one another.

19. A low-force electrical connector for use in impedance cardiography systems, comprising:

a one-piece bias metallic element having:

first and second substantially opposing portions adapted to move relative to one another;

first and second connecting portions coupled to respective ones of said first and second opposing portions;

an aperture portion coupled to both said connecting portions and comprising a variable size aperture, said aperture being configured to receive a terminal of an impedance cardiography electrode patch; and

a substantially non-conductive housing element substantially containing said bias element, said housing having an opening formed therein substantially coincident with said aperture;

wherein upon biasing said connector onto said terminal, said aperture at least temporarily expands in size to receive said terminal in a frictional engagement and wherein said aperture portion and said first and second substantially opposing portions are disposed at different vertical heights from one another within said connector.