Method of making plastic-coated wire objects such as intrauterine contraceptive devices

Claim 1

METHOD OF MAKING AN UID COMPRISING A V-SHAPED PORTION HAVING A SPRINGY, SOFT-PLASTIC-COATED METAL WIRE CORE AND A SOFT-PLASTIC TAIL PORTION EXTENDING AWAY FROM THE APEX OF THE V COMPRISING A. MOLDING AT LEAST THE BOTTOM HALF OF THE PLASTIC TAIL AND A BOTTOM PLASTIC PART OF THE V-SHAPED PORTION IN A TWO-PART DIE HAVING A CAVITY IN THE BOTTOM HALF OF THE DIE CORRESPONDING TO THE ENTIRE BOTTOM HALF OF THE PLASTIC COAT, THE UPPER HALF OF THE TWO-PIECE DIE HAVING A MALE PROJECTION ROUNDED AT ITS END TO PRODUCE IN THE CENTER OF SAID PLASTIC COAT PORTION A DEPRESSION CORRESPONDING TO THE BOTTOM HALF OF WIRE TO BE COATED, SAID UPPER HALF HAVING ALSO RECESSES TO PRODUCE UPSTANDING FOLDABLE MEMBERS OF PLASTIC MATERIAL PROJECTING UPWARDLY ON BOTH SIDES OF SAID DEPRESSION, B. WITHDRAWING THE UPPER HALF OF THE DIE, LEAVING IN THE BOTTOM HALF THE PLASTIC ELEMENT THUS FORMED, WHICH CONSTITUTES A TIAL PORTION AND A BOTTOM PART OF THE V-PORTION, SAID LAST PART HAVING A CENTRAL V-SHAPED DEPRESSION CORRESPONDING TO THE LOWER HALF OF THE WIRE COREOF THE IUD, AND SAID FOLDABLE MEMBERS EXTENDING UP FROM SAID BOTTOM PART ON EITHER SIDE OF SAID DEPRESSION, C. PLACING THE V-SHAPED METAL WIRE CORE OF THE IUD IN SAID DEPRESSION SO THAT IT LIES ON THE BOTTOM THEREOF WITH SAID FOLDABLE MEMBERS EXTENDING UPWARDLY ON EITHER SIDE OF THE WIRE TO PREVENTITS DISPLACEMENT, D. REPLACING THE UPPER HALF OF THE DIE WITH A SECOND UPPER HALF DIE HAVING AN ELONGATED CAVITY CORRESPONDING TO THE UPPER HALF OF THE PRODUCT AND FORCING SAID SECOND HALF DIE DOWN INTO ENGAGEMENT WITH THE LOWER HALF DIE SO THAT ITS ELONGATED CAVITY PORTION FOLDS SAID FOLDABLE MAMBERS INWARDLY OVER AND AROUND THE TOP PART OF THE WIRE TO SECURELY POSITION THE WIRE WITHIN THE PLASTIC AND CAUSE SAID MEMBERS TO INTERDIGITATE, F. AND INJECTING MORE PLASTIC MATERIAL THROUGH SAID UPPER HALF DIE TO COMPLETELY SURROUND AND ENCLOSE THE WIRE AND COMPLETE FORMING THE IUD.