Hydrocarbon block copolymer with dispersed polysiloxane

Details Hydrocarbon block copolymer with dispersed polysiloxane Hydrocarbon block copolymer with dispersed polysiloxane

1983-02-10

1985-04-16

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

12820715, A61M 2500

Patent

active

045113548

ABSTRACT:
A composition of matter composed of a thermoplastic elastomeric hydrocarbon block copolymer having 0.1 to 8 percent polysiloxane, or silicone oil, uniformly distributed throughout. The composition exhibits improved surface, elasticity, and tensile strength characteristics as well as superior processibility. The block copolymer may take the form of styrene-ethylene-butylene-styrene in which the styrene blocks have a molecular weight of 5,000 to 40,000 and the ethylene-butylene block has a molecular weight of 20,000 to 500,000. Uniformly dispersed mineral oil may constitute 10 to 60 percent of the composition's total weight which may also include less than 45 percent polypropylene. Combining the copolymer with the silicone oil occurs under the influence of a pressure of 1,500 to 2,500 p.s.i. such as provided by extrusion blending. The resulting elastomeric composition may extrude in sheets as thin as 0.015, 0.010, or even 0.005 inch, which a puller may thin even further. The resulting composition has a surface smoothness microscopically characteristic of silicone rubber. As one of its many varied uses, the elastomer may find use as an inflatable cuff or balloon on such medical devices as endotracheal tubes. The high elasticity of the composition permits it to act, when in the trachea, as a high residual volume type endotracheal tube, except that it avoids the folds which permit aspiration fluids to channel to the patient's lungs. The pressure it exerts against the tracheal wall falls even below the high volume device. When not inflated, the material returns to a sufficiently small volume that it acts as a low volume device for ease of insertion and withdrawal.

REFERENCES:
patent: 4147169 (1979-04-01), Taylor
patent: 4335723 (1982-06-01), Patel

Affiliated with

Also associated with

Rating

Hydrocarbon block copolymer with dispersed polysiloxane does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydrocarbon block copolymer with dispersed polysiloxane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrocarbon block copolymer with dispersed polysiloxane will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1453743