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US 3,943,225 AGranted
Catheter
AssigneeProMed Laboratories Inc.
InventorWilbur R. Koehn
Life of this patent
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AssigneeProMed Laboratories Inc.
InventorWilbur R. Koehn
Estimating the term…
A method and apparatus is disclosed for making a combined needle and catheter of the type in which the needle is used to lead the end of the catheter thereon into a body cavity and, after insertion, is withdrawn through the catheter with most of the catheter remaining in the body. To form the catheter, the needle is initially placed in an upright position with its pointed end downward and located within the orifice of a die wiper. Thereafter, a measured quantity of a viscous plastic material or fluid plastisol is applied to the die wiper on the side thereof opposite the pointed end of the needle and the assembly of needle, die wiper and plastisol is then inverted so that the die wiper falls by gravity and wipes a coating of fluid plastisol along the shank of the needle. When the die wiper has completed its traverse of the needle shank, the assembly is heated to solidify the fluid plastisol on the needle and thereby form a removable flexible catheter on the needle.
The method of making a plastic catheter with the aid of a mandrel having an outside diameter corresponding to the diameter of the lumen of the catheter to be formed and a die wiper having at one end an orifice of somewhat larger diameter than the outside diameter of said mandrel and further having a reservoir in open communication with said orifice, said method comprising the steps of, placing said die wiper about a first end of said mandrel with the said orifice thereof facing in the same direction as said first end of said mandrel, applying a mass of an at least semi-viscous liquid plastic material on said mandrel at least adjacent said reservoir of said die wiper on the side thereof opposite said mandrels' first end, positioning said mandrel substantially vertically, structurally supporting only one of said die wiper or said mandrel and relatively moving said die wiper from said first end of the mandrel to the opposite end thereof in a manner such that the mandrel passes freely through said die wiper and the latter engages the mass of liquid plastic material previously applied to said mandrel and thereby wipes a coating of said plastic material onto the exterior of said mandrel, and then curing said liquid plastic material on said mandrel thereby forming a flexible catheter thereon.
The method of making a plastic catheter with the aid of a mandrel having an outside diameter corresponding to the diameter of the lumen of the catheter to be formed and a die wiper having an orifice of larger diameter than the outside diameter of said mandrel, said method comprising the steps of, placing said mandrel in an upright position with the orifice of the die wiper around its lower end, applying an at least semi-viscous liquid plastisol on said die wiper on the side thereof opposite said lower end, inverting the assembly of mandrel, die wiper and plastisol so that the die wiper falls by gravity and wipes a coating of plastisol between the exterior of said mandrel and the interior of said die orifice, and then heating the assembly to cure said liquid plastisol on said mandrel and form a flexible catheter thereon.
The method of making a combined needle and catheter of the type in which the needle is used to lead the end of the catheter thereon into a body cavity and, after insertion, is withdrawn through said catheter leaving the end of the catheter in the body cavity, said method, with the aid of a die wiper having an orifice of larger diameter than the outside diameter of said needle, comprising the steps of, placing said needle in an upright position with its pointed end downward and located in the orifice of the die wiper, applying a measured quantity of an at least semi-viscous fluid plastic material on said die wiper on the side thereof opposite said pointed end, inverting the assembly of said needle, die wiper and fluid plastic so that the die wiper falls by gravity and wipes a coating of the fluid plastic along the shank of said needle, and then heating the assembly to solidify the fluid plastic on said needle and form a removable flexible catheter thereon.
The method fo making a combined needle and catheter of the type wherein a needle having a handle assembly is used to lead the end of a catheter thereon into a body cavity and, after insertion, is withdrawn through said catheter leaving the end of the catheter in the body cavity, said method comprising the steps of, inserting said needle through a preformed fitting member, frictionally engaging the interior of said catheter fitting member with said needle handle, inserting said needle through the central orifice of a die wiper having a reservoir portion opening towards said catheter fitting member, inserting the free end of said needle in a guide member, placing the assembly of needle, catheter hub, die wiper and guide member in an upright position at a first station with said guide member at the lower end of the assembly and the upper portion of the guide member surrounded by said die wiper, applying a measured quantity of an at least semi-viscous fluid plastisol of a plastic resin in the reservoir of said die wiper about said needle and the upper portion of said guide, rotating said assembly about its central vertical axis to fully distribute said plastisol in said reservoir and fully wet said needle, inverting said assembly so that said die wiper falls by gravity and wipes a substantially circumferentially uniform wall of the fluid plastisol along the entire shank of the needle above said catheter fitting member, then heating the assembly to solidify the fluid plastisol on said needle to form a removable flexible catheter thereon.
The method of making a plastic tubular article with the aid of a mandrel having an outside diameter corresponding to the diameter of the lumen of the tubular article to be formed and a die wiper having at one end an orifice of a slightly larger diameter than the outside diameter of said mandrel and of said tubular article to be formed and further having an enlarged reservoir in open communication with said orifice, said method comprising the steps of, placing said die wiper concentric to and adjacent one end of said mandrel and with said orifice facing in the same direction as said one end of said mandrel, charging an at least semi-viscous liquid plastic material into the reservoir of said die wiper and onto said mandrel thereat, causing relative falling movement by means of gravity of said die wiper along said mandrel with the latter in a substantially vertical orientation so that a substantially circumferentially uniform coating of said plastic material is drawn from said die wiper through said orifice onto the exterior of said mandrel passing therethrough, then treating the assembly to cure said coating of liquid plastic material on said mandrel and form said tubular article thereon.
The method of making a combined needle and catheter of the type in which the needle is used to lead the end of the catheter thereon into a body cavity and, after insertion, is withdrawn through said catheter leaving the end of the catheter in the body cavity, wherein said needle includes a distal end and a proximal end, said method, with the aid of a die wiper having at one end an orifice of somewhat larger diameter than the outside diameter of said needle, comprising the steps of;
Dependencies are inferred from the claim text.