Body implantable lead

Details Body implantable lead Body implantable lead

1979-12-26

1981-05-26

Kamm, William E.

Surgery

Truss

Pad

A61N 104

Patent

active

042691982

ABSTRACT:
A body implantable lead of the type having a lead body, at least one electrode carried by the lead body and tissue engaging tines extending at an acute angle from the lead body at a location adjacent the electrode. The present invention correlates the tensile stiffness of the lead body with the stiffness of the tines to optimize the tine holding force. The tines provide an adequate holding force to minimize unintentional lead dislodgements without requiring in an excessive force for intentional dislodgement of the lead for repositioning. Tine length and the angle at which they extend from the lead body are also discussed as affecting the probability of tine engagement with cardiac structure as well as having an effect on the holding force. In a preferred embodiment, the lead body has a spring constant (as defined herein) of 2.0 lb-in./10 in. or less and a tine stiffness (also defined herein) of less than 5.times.10.sup.-3 lb-in..sup.2. The tines are from two to six millimeters long and extend from the lead body at an angle from 30.degree. to 80.degree.. More preferably, the tine stiffness is 3.times.10.sup.-3 lb-in..sup.2 or less with the tines being from four to six millimeters long and forming an angle with the lead body from 45.degree. to 60.degree.. In the preferred embodiments, the exposed surface of the lead body and the tines are formed of a body compatible urethane. In the most preferred embodiment, the tine stiffness is approximately 2.5.times.10.sup.-3 lb-in..sup.2.

REFERENCES:
patent: 3754555 (1973-08-01), Schmitt
patent: 3814104 (1974-06-01), Irnich et al.
patent: 3902501 (1975-09-01), Citron et al.
patent: 3939843 (1976-02-01), Smyth
patent: 3976082 (1976-08-01), Schmitt
patent: 4033357 (1977-07-01), Helland et al.

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