Low impedance, low durometer, dry conforming contact element

Claim 2

A contact comprised of a non-drying mass of nonconductive material having a low durometer and conductive elements dispersed in the mass of material in sufficient quantity to establish contact between the elements to provide a resistivity which is less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2 and comprising more than 30% by weight of the contact.

Claim 3

A contact as in claim 1 wherein said conductive elements are formed of a material which is nonreactive to body fluids.

Claim 4

A contact as in claim 2 wherein said conductive elements are formed of a noble metal.

Claim 5

A contact as in claim 1 wherein said conductive elements are in the form of members of an inert material having a conductive coating formed thereon.

Claim 6

A contact as in claim 4 wherein said conductive coating is comprised essentially of a metal.

Claim 7

A contact as in claim 5 wherein said metal is silver and wherein the conductive elements have a silver content of at least 2 percent by weight.

Claim 8

A contact as in claim 1 wherein the mass of nonconductive material is a chemically inert polymer.

Claim 9

A contact as in claim 7 wherein said contact has a tacky surface which remains tacky over substantial periods of time.

Claim 10

A contact as in claim 7 wherein said polymer is an insulating gel.

Claim 11

A contact as in claim 1 having a durometer ranging from 20 to 50 on a PTC Model 302 SL Tester.

Claim 12

A contact as is claim 1 wherein the contact has zero volts for DC offset, internal noise and defibrillation recovery.

Claim 13

A contact as in claim 1 which has an AC impedance of less than five ohms.

Claim 14

A contact as in claim 1 having a putty-like consistency.

Claim 15

A contact comprised of a non-drying mass of nonconductive material having a low durometer and conductive elements dispersed in the mass of material in sufficient quantity to establish contact between the elements to provide a resistivity which is less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2, said conductive elements having a size ranging from 15 to 100 microns in any dimension.

Claim 16

A contact comprised of a non-drying mass of nonconductive material having a low durometer and conductive elements dispersed in the mass of material in sufficient quantity to establish contact between the elements to provide a resistivity which is less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2, said conductive elements having a size ranging from 15 to 100 microns in any dimension.

Claim 17

A contact comprised of a mass of nonconductive material having a low durometer and conductive elements dispersed in the mass of material in sufficient quantity to establish contact between the elements to provide a resistivity which is less than 100 ohm-cm, said contact having a surface with ridges extending transversely thereon to permit the skin of a patient to breathe.

Claim 18

A contact comprised of a mass of nonconductive material having a low durometer and conductive elements dispersed in the mass of material in sufficient quantity to establish contact between the elements to provide a resistivity which is less than 100 ohm-cm, said contact having a surface with ridges extending transversely thereon to permit the skin of a patient to breathe.

Claim 19

In a low impedance electrode for engaging the skin of a patient, a pad having a surface, said pad being formed with a recess therein, a metallic button disposed within the recess and means securing the metallic button on the pad so that it remains with the pad, a conductive polymer contact disposed within said recess and engaging said button, said polymer contact having conductive elements therein and being characterized in that it has a resistivity of less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2 and comprising more than 30% by weight of the polymer contact.

Claim 20

In a low impedance electrode for engaging the skin of a patient, a pad having a surface, said pad being formed with a recess therein, a metallic button disposed within the recess and means securing the metallic button on the pad so that it remains with the pad, a conductive polymer contact disposed within said recess and engaging said button, said polymer contact having conductive elements therein and being characterized in that it has a resistivity of less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2 and comprising more than 30% by weight of the polymer contact.

Claim 21

An electrode as in claim 16 together with a protective element enclosing said contact and an adhesive disposed between said protective element and said pad for retaining said protective element on said pad.

Claim 22

An electrode as in claim 16 together with lead means connected to said button for making electrical contact to the button.

Claim 23

In a low impedance electrode for engaging the skin of a patient, a pad having a surface, said pad being formed with a recess therein, a metallic button disposed within the recess and means securing the metallic button on the pad so that it remains with the pad, a conductive polymer contact disposed within said recess and engaging said button, said polymer contact having conductive elements therein and being characterized in that it has a resistivity of less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2 and comprising more than 30% by weight of the polymer contact, said polymer contact having a low durometer in the range of 20 to 50 on PTC Model SL Tester, said polymer contact having a tacky surface.

Claim 24

In a low impedance electrode for engaging the skin of a patient, a pad having a surface, said pad being formed with a recess therein, a metallic button disposed within the recess and means securing the metallic button on the pad so that it remains with the pad, a conductive polymer contact disposed within said recess and engaging said button, said polymer contact having conductive elements therein and being characterized in that it has a resistivity of less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2 and comprising more than 30% by weight of the polymer contact, said polymer contact having a low durometer in the range of 20 to 50 on PTC Model SL Tester, said polymer contact having a tacky surface.

Claim 25

In a pacemaker lead, a flexible elongate element having a distal extremity, a conductive tip formed on the distal extremity, said conductive tip being formed of a non-drying mass of conductive material having a low durometer and conductive elements disposed in the mass of material in sufficient quantity to establish contact between the elements to provide resistivity which is less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2.

Claim 26

In a pacemaker lead, a flexible elongate element having a distal extremity, a conductive tip formed on the distal extremity, said conductive tip being formed of a non-drying mass of conductive material having a low durometer and conductive elements disposed in the mass of material in sufficient quantity to establish contact between the elements to provide resistivity which is less than 100 ohm-cm, said conductive elements having an L over D ratio of 20 or less and greater than 2.