United States Patent m
[li] 4,437,474  Mar. 20,1984
 METHOD FOR MAKING
MULTICONDUCTOR COIL AND THE COIL
 Inventor: Charles A. Peers-Trevarton, Coral Springs, Fla.
 Assignee: Cordis Corporation, Miami, Fla.
 Appl. No.: 399,063
 Filed: Jul. 16,1982
 Int. C1.3 A61N 1/04
 U.S. CI 128/784; 128/419 P;
128/780; 29/605; 29/618; 29/876; 29/872
 Field of Search 128/419 P, 784, 785,
128/786; 174/103, 105 R; 29/876, 605, 618, 882, 879, 872, 868
 References Cited
U.S. PATENT DOCUMENTS
3,572,344 3/1971 Boldue 128/786
3,596,662 8/1971 Boldue 128/786
4,236,525 12/1980 Slvetz et al 128/419 P
4,394,866 7/1983 Hughes 128/419 P X
4,402,330 9/1983 Lindemans 128/786
Primary Examiner—Edward M. Coven
Attorney, Agent, or Firm—Henry W. Collins; Thomas R.
The method of the present invention is used to make a multiconductor coil having an outer diameter equal to the diameter of a winding mandrel plus the diameter of wires being coiled while preserving homogeneity of the insulating coating and of the insulation between the wires. The method includes the steps of: winding a first uninsulated wire conductor on a winding mandrel with a predetermined spacing between adjacent turns of the coil of wire conductor; coating the uninsulated coil of wire conductor with an insulating coating; repeating the above two steps for each additional wire conductor to be included in the multiconductor coil; and, after the insulating coating on each wire conductor coil has dried and/or solidified, screwing each additional coil into the first coil to form a multiconductor coil having a desired homogeneity of the insulating coating and of the insulation between adjacent turns in the multiconductor coil.
5 Claims, 9 Drawing Figures