MR. MIGUEL A CASTILLO, COTA
Occupational Therapy at 163 St, Miami, FL

6077880, Jun 20, 2000

Jul 22, 1998

9/120414

Miguel Castillo - Hialeah FL
Joquin Villalobos - Miami FL
Jeffrey Walker - Fort Lauderdale FL

Cordis Corporation - Miami FL

C08J 704, A61L 2918, A61L 2908

523105

In accordance with the present invention there is provided a method for making a highly radiopaque polyolefin compound, wherein the radiopaque material in said compound is substantially uniformly dispersed and held within a polymer matrix. During the method one first heats an amount of polyolefin, preferably low density polyethylene, to at least its melting temperature. The amount of polyolefin is equal to at least 10% by weight of the compound. Then an amount of radiopaque metal powder is added to the polyolefin. The amount of radiopaque metal is equal to up to 90% by weight of the compound. The metal powder is preferably tantalum, tungsten, gold or platinum. Thereafter, an amount of a dispersing agent is added to the polyolefin to form a mixture. The amount of dispersing agent is equal to at least 0. 2% by weight of the compound.

5171232, Dec 15, 1992

Jul 12, 1991

7/729372

Miguel A. Castillo - Hialeah FL
Javier E. Castaneda - Miami FL
Eric Glemser - Miami FL

Cordis Corporation - Miami Lakes FL

A61M 2500

604280

A flexible plastic catheter defines a flexible, distal tip. In accordance with this invention, the distal tip comprises a plastic formulation containing sufficient radiopaque agent to be substantially more radiopaque and preferably softer than portions of the catheter proximal to the tip. Thus, the distal tip area of the catheter can be flexible to avoid possible tissue damage as the catheter is advanced, but is still readily visible by x-ray. At the same time, the majority of the catheter may be of normal flexibility and strength.

5045072, Sep 3, 1991

Jun 13, 1989

7/365477

Miguel A. Castillo - Hialeah FL
Javier E. Castaneda - Miami FL
Eric Glemser - Miami FL

Cordis Corporation - Miami Lakes FL

A61M 2500

604280

A flexible plastic catheter defines a flexible, distal tip. In accordance with this invention, the distal tip comprises a plastic formulation containing sufficient radiopaque agent to be substantially more radiopaque and preferably softer than portions of the catheter proximal to the tip. Thus, the distal tip area of the catheter can be flexible to avoid possible tissue damage as the catheter is advanced, but is still readily visible by x-ray. At the same time, the majority of the catheter may be of normal flexibility and strength.