Laser weldable flexible medical tubings, films and assemblies thereof

A medical fluids delivery assembly comprising:

• a container for storing a therapeutic fluid;
• and
• a laser-weldable tubing having a sidewall having a layer of a non-PVC containing polymer blend of 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 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;
• and
• the laser-weldable tubing being connected to the container.

A tubing assembly comprising:

• a first tubing of a first material containing polyvinyl chloride;
• a second tubing of a second material which does not bond well directly to the first tubing, the second material comprising a polymer blend of a first component of a material not thermally responsive to 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 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 run to about 1500 nm to melt upon exposure to the laser beam for a short period of time;
• and
• a coupler joining the first tubing to the second tubing in fluid communication.

A medical fluid delivery tubing set assembly comprising:

• a first tubing in fluid communication with a source of a therapeutic fluid;
• a second tubing of a non-PVC material having a layer of a blend of a first component of a material not thermally responsive to a laser beam and a second component of a laser responsive material, a third tubing in fluid communication with a patient to be treated by the therapeutic fluid, the third tubing being connected to a first end of the second tubing;
• and
• a coupler connecting a second end of the first tubing to the second tubing.