Laser weldable flexible medical tubings, films and assemblies thereof

A laser weldable tubing comprising:

• a sidewall having a layer from a polymer blend comprising a first component of a material not thermally responsive to a laser beam and selected from the group consisting of polyolefins, ethylene and lower alkyl acrylate copolymers, ethylene and lower alkyl substituted alkyl acrylate copolymers, ethylene vinyl acetate copolymers, polybutadienes, polyesters, polyamides, and styrene and hydrocarbon copolymers, a second component in an amount by weight of from about 20 ppm to about 500 ppm of a laser responsive material having low solubility in aqueous medium and the layer being sufficiently thermally responsive to exposure to a laser beam having a wavelength within a range of wavelengths from about 700 nm to about 1500 nm to melt a portion of the sidewall upon exposure to the laser beam for a short period of time.

A film comprising:

• a layer of a first blend of a polymeric component and a laser responsive component wherein the polymeric component is a second blend comprising by weight of from about 35% to about 45% of a first ethylene and α-olefin copolymer having a density of less than about 0.900 g/cc, from about 20% to about 30% of a second ethylene and α-olefin copolymer having a density of higher than about 0.900 g/cc but less than about 0.910 g/cc, and from about 30% to about 40% of a polypropylene and wherein the film is sufficiently thermally responsive to exposure to a laser beam having a wavelength within a range of wavelengths from about 700 nm to about 1500 nm to at melt upon exposure to the laser beam for a short period of time.

A film comprising:

• a layer of a blend of an ethylene and α-olefin copolymer and a dye having a functional group selected from the group polymethine, porphine, indanthrene, quinone, di- and tri-phenylmethane, and metal complexed dithiol dyes.

A laser weldable multiple lumen tubing comprising:

• a first lumen and a second lumen each having a layer from a polymer blend comprising a first component of a material not thermally responsive to a laser beam and selected from the group consisting of polyolefins, ethylene and lower alkyl acrylate copolymers, ethylene and lower alkyl substituted alkyl acrylate copolymers, ethylene vinyl acetate copolymers, polybutadienes, polyesters, polyamides, and styrene and hydrocarbon copolymers, a second component in an amount by weight of from about 20 ppm to about 2,000 ppm of a laser responsive material having low solubility in aqueous medium and the layer being sufficiently thermally responsive to exposure to a laser beam having a wavelength within a range of wavelengths from about 700 nm to about 1500 nm to melt a portion of the sidewall upon exposure to the laser beam for a short period of time.