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US 2009/0267259 A1Published application
Medical Devices
AssigneeBoston Scientific Scimed, Inc.
InventorsDouglas A. Devens, JR., Michele Zoromski
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Abstract
Medical devices and methods of making the devices are described. In some embodiments, the devices include multiple layers, and one or more layers can include a nanocomposite material.
Claims20
A method of manufacturing a device including a first layer and a second layer, the method comprising:
- selecting a material for the second layer, the material having a viscosity value at a shear rate of about 1 s−1 or less and at a selected temperature;
- selecting a nanocomposite material for the first layer that has a viscosity within about 20% to about 125% of the viscosity value of the material for the second layer;
- and
- co-extruding the first and second layers.
1 more element
A method of making a medical device, the method comprising:
- forming a tubular member, the tubular member comprising a first layer and a second layer co-extruded with the first layer, wherein one of the layers comprises a nanocomposite material, and one of the layers comprises a thickness that varies by less than about 20% from a mean value of thickness, the thickness being measured at four points per cross-sectional cut made at ten random, non-consecutive locations along a production length of the tubular member;
- and
- incorporating a portion of the tubular member as a component of the medical device.
A high precision method of manufacturing a medical device having a three-layer elongate shaft, the method comprising the steps of:
- providing a first material that will form an outer layer of the elongate shaft, the first material comprising a nanocomposite material having a first viscosity measured at a shear rate of 1 s−1 and a temperature of 220° C.;
- providing a second material that will form a middle layer of the elongate shaft, the second material comprising a polyolefin having a second viscosity measured at a shear rate of 1 s−1 and a temperature of 220° C.;
- providing a third material that will form an inner layer of the elongate shaft, the third material comprising a high density polyethylene having a third viscosity measured at a shear rate of 1 s−1 and a temperature of 220° C.;
- and
- co-extruding the first material, the second material and the third material to form the three-layer elongate shaft;
- wherein the first viscosity has a value that is between 25 percent and 125 percent of the second viscosity and the second viscosity is between 5 percent and 35 percent of the third viscosity.
3 more elements
Dependencies are inferred from the claim text.