Method for die release during catheter tipping
AssigneeBecton, Dickinson and Company
InventorVictor A. Williamitis
Life of this patent
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Abstract
A method for catheter tipping including applying to a catheter blank a layer of a noncuring aminoalkyl terminated polysiloxane lubricant, mounting the lubricated blank on a mandrel and advancing the mandrel-catheter assembly into a heated die so that the die causes the heated tip of the blank to assume the shape of the die. The catheter may then be cut beyond the shaped tip and easily removed from both the die and the mandrel.
Claims8
A method for forming a shaped tip on a polyurethane catheter comprising:
- (a) applying a film of a noncuring aminoalkyl terminated polysiloxane lubricant to an untipped polyurethane catheter tubing;
- (b) mounting said tubing onto a mandrel;
- (c) engaging said tubing to a die heated to a temperature sufficient to soften said polyurethane and cause the tip of said tubing to assume the shape of said die;
- and
- (d) cutting the shaped catheter tubing to give a tipped catheter and removing same from said die and from said mandrel.
A method for forming a shaped tip on a plastic catheter comprising:
- (a) applying a film of a noncuring polysiloxane lubricant terminated with an active functional group to an untipped plastic catheter tubing;
- (b) engaging said tubing to a die heated sufficiently to soften said plastic so that the softened tip of said tubing assumes the shape of said die;
- and
- (c) cutting the shaped tubing and removing same from said die to give a catheter having a shaped tip.
A method for forming a shaped tip on a polyurethane catheter comprising:
- (a) applying a layer of a noncuring aminopropyl terminated polysiloxane lubricant having a viscosity of about 1,000 to 2,000 ctsk to an untipped polyurethane catheter tubing;
- (b) mounting said tubing onto a mandrel;
- (c) advancing said mandrel and tubing to a die heated to about 100.degree. to 200.degree. C.;
- (d) applying pressure to said tubing so that said tubing engages said heated die, softens and assumes the shape of said die;
- (e) cutting the shaped catheter tubing to give a tipped catheter;
- and
- (f) removing said tipped catheter from said die and from said mandrel.
Dependencies are inferred from the claim text.