A medical tube includes a distal portion provided on one end side having a first outer diameter, a first inner diameter, and a first thickness; a proximal portion provided on the other end side having a second outer diameter greater than the first outer diameter, a second inner diameter greater than the first inner diameter, and a second thickness greater than the first thickness; and an intermediate portion provided between the distal portion and the proximal portion and having an outer diameter, an inner diameter, and a thickness which gradually vary. Thus, a medical tube is provided having improved operability and which reduces the likelihood of bending during an operation.

A high-temperature high-linear-pressure micro-eutectic method for enhancing a strength of a polytetrafluoroethylene (PTFE)-based membrane is disclosed. The method comprises the following steps: pushing a PTFE-based nano functional composite membrane forwards at a speed of 6-8 m/min in a high-temperature high-linear-pressure micro-eutectic cavity with a length of 1.5 m at a temperature of 380° C., controlling a linear pressure of a surface of the PTFE-based membrane to be 50-80 N/m, and under a coiling traction of a membrane coiling roller outside the cavity, enabling membrane molecular chains to shrink and generate eutectic phases, wherein multiple micro-eutectic molecular structures are arranged in parallel, and the PTFE-based nano functional composite membrane has a density of 2.1 kg/m.sup.3 and has nanoscale macromolecular aggregates and a nano-scale and micron-scale concave-convex geometrical ultra-micro-structure morphology with a surface average size of 10-20 .Math.m, a height of 5-10 .Math.m and a spacing of 10-20 .Math.m.

[Object] To provide a technology capable of further improvement of the performance of a PEEK molded body.

[Solving Means] A PEEK molded body includes: a body portion having a first exothermic peak, and a second exothermic peak positioned at a higher temperature than the first exothermic peak, as two exothermic peaks indicating crystallization of PEEK in a DSC curve. The surface layer portion covers the body portion, and has a third exothermic peak, positioned at a higher temperature than the first exothermic peak, as an only exothermic peak indicating crystallization of PEEK in a DSC curve.

[Selected Drawing] None

A method for printing a three-dimensional part with an additive manufacturing system, which includes providing a part material that compositionally has one or more semi-crystalline polymers and one or more secondary materials that are configured to retard crystallization of the one or more semi-crystalline polymers, where the one or more secondary materials are substantially miscible with the one or more semi-crystalline polymers. The method also includes melting the part material in the additive manufacturing system, forming at least a portion of a layer of the three-dimensional part from the melted part material in a build environment, and maintaining the build environment at an annealing temperature that is between a glass transition temperature of the part material and a cold crystallization temperature of the part material.

A prosthetic tissue valve and a method of treating the prosthetic tissue valve are provided. The method includes: decreasing a temperature of a chamber carrying the prosthetic tissue valve from a first preset temperature to a second preset temperature in a first cooling rate; decreasing the temperature of the chamber carrying the prosthetic tissue valve from the second preset temperature to a third preset temperature in a second cooling rate; and performing a drying process to the prosthetic tissue valve. The second preset temperature is a critical crystallization temperature and is greater than a crystallization temperature of the prosthetic tissue valve. The third preset temperature is lower than the crystallization temperature of the prosthetic tissue valve, and the second cooling rate is greater than the first cooling rate.

Provided is a semiaromatic polyamide film having an average linear expansion coefficient in the width direction, measured under conditions of 20 to 125° C., of -90 to 0 ppm/°C.

A composite is provided to include an elastomer substrate comprising methyl groups. The composite may also include a layer of glass comprising SiO.sub.2 formed over the elastomer substrate. A method of fabricating the composite is provided. The method may include diffusing an ozone-rich gas into the substrate of an elastomer substrate comprising methyl groups. The method may also include exposing the elastomer substrate to UV radiation for a period of time. The method may further include converting a surface portion of the elastomer substrate into a layer of glass formed over the elastomer substrate.

A method for printing a three-dimensional part with an additive manufacturing system, which includes providing a part material that compositionally has one or more semi-crystalline polymers and one or more secondary materials that are configured to retard crystallization of the one or more semi-crystalline polymers, where the one or more secondary materials are substantially miscible with the one or more semi-crystalline polymers. The method also includes melting the part material in the additive manufacturing system, forming at least a portion of a layer of the three-dimensional part from the melted part material in a build environment, and maintaining the build environment at an annealing temperature that is between a glass transition temperature of the part material and a cold crystallization temperature of the part material.

A crystallized bioabsorbable polymer scaffold comprises a polymer composition of poly (L-lactide-co-tri-methylene-carbonate) or poly (D-lactide-co-tri-methylene-carbonate) or poly (L-lactide-co-ε-caprolactone) or poly (D-lactide-co-ε-caprolactone) in the form of block copolymers of blocky copolymers, wherein the scaffold is cold-bendable.

A crystallized bioabsorbable polymer scaffold comprises a polymer composition of poly (L-lactide-co-tri-methylene-carbonate) or poly (D-lactide-co-tri-methylene-carbonate) or poly (L-lactide-co-ε-caprolactone) or poly (D-lactide-co-ε-caprolactone) in the form of block copolymers of blocky copolymers, wherein the scaffold is cold-bendable.