David B Batdorf, 61Xmas, FL

2001002, Oct 11, 2001

May 18, 2001

09/731458

Christopher Wages - San Miguel CA, US
David Batdorf - Elk Rapids MI, US
Charles Schryver - Atascadero CA, US

Specialty Silicone Fabricatiors, Inc.

F16L009/18

138/115000, 138/116000

A tubing having unitary construction and having a single lumen portion, a multilumen portion and a transition portion therebetween. The single lumen is in fluid communication with each and every lumen comprising the multilumen portion. The tubing may be made in any desired length by means of extrusion. The outer surface of the tubing may be either smooth or grooved and have any desired cross-sectional geometry. Similarly, any of the lumens can be made to have a desired cross-sectional shape and size. Although the tubing can be made from any extrudable material, a preferred material is medical grade silicone elastomer. An extrusion apparatus and a method for making the tubing in a continuous process is described.

2002019, Dec 19, 2002

Jun 13, 2001

09/881510

David Batdorf - Templeton CA, US
Mun-Chung Yun - Paso Robles CA, US

A61F013/00

602/048000, 602/046000

A surgical wound dressing wherein an elastomeric sheet of cured closed cell silicone foam forms a support layer. A silicone gel is applied to one surface of the foam sheet to form a skin-facing layer. The resultant wound dressing may be stretched and placed upon a person's skin to overlie a wound and provide a fluid impermeable barrier between the wound and the external environment. In addition, the closed-cell foam may be elastically compressed against the skin to reduce swelling and protect the wound from mechanical trauma during the healing process.

5549579, Aug 27, 1996

Jul 25, 1995

8/506607

David B. Batdorf - Paso Robles CA
Charles A. Schryver - Atascadero CA

Specialty Silicone Fabricators - Paso Robles CA

A61M 2700

604264

A unitary tube useful for the conduction of fluids to and from a site within the body of a patient. A particularly preferred embodiment is a drainage tube. The drainage tube, which may be continuously extruded from a biocompatible elastomer, has a variable exterior and interior cross section along its length. The drainage tube has collecting, transition and extension portions. The collecting portion, which has a hollow interior to receive fluids, is temporarily implanted within a wound site or other body cavity to enable body fluids to collect therein. The collecting portion is preferably a flattened tubular member having a width that exceeds the height. The interior wall of the collecting portion has longitudinal ribs or struts to prevent opposing walls from collapsing upon each other. The collecting portion preferably has fenestrations in its wall to permit the passage of body fluids from the surrounding tissue into the hollow interior lumen of the collection portion. The outer wall of the collecting portion tapers down by means of a transition portion to a tubular extension portion.

6117170, Sep 12, 2000

Jun 18, 1998

9/099637

David B. Batdorf - Templeton CA

Specialty Silicone Fabricators, Inc. - Paso Robles CA

A61F 214

623 4

An elongate elastomeric band having unitary construction which construction includes a silicone sponge differentially compressive portion disposed along the length thereof. The band is dimensioned to encircle the eye of a patient having a detached retina. In use, the band is placed around the eye and surgically attached thereto in an encircling position. The band circumferentially deforms the sclera, particularly the portion of the sclera overlying the area of retinal detachment, the differentially compressive portion forcing the choroid and detached portion of the retina into juxtaposition for reattachment. The band, which includes a closed-cell silicone foam differentially compressive portion along a section of its length, is manufactured by means of extrusion providing an elastomeric, preferably silicone, band having unitary construction and varying in both its outer dimension and its compressibility along the length thereof. The transition in the outer dimension of the surface of the band along the band's length is gradual; tapering smoothly from the bulbous differentially compressive portion which has the greatest outer circumference to the relatively slender elastic band portion overlying and projecting outwardly from both ends of the differentially compressive portion. The band is made by simultaneously co-extruding a relatively non-compressible silicone elastomer and a silicone foam elastomer through a single die orifice having a controllable and variable shape and size followed by vulcanization of the extruded article.

5945052, Aug 31, 1999

Sep 18, 1995

8/530523

Charles Schryver - Atascadero CA
David Batdorf - Paso Robles CA

Specialty Silicone Fabricators - Paso Robles CA

B29C 4722

264167

An extruded "Y" or bifurcated tube having unitary construction and an extrusion apparatus therefor. The "Y" tube includes three separate tubes, each tube having a central lumen, and a transition portion integral with the tubes and providing physical connection and fluid communication between the individual lumens of the three separate tubes. The first of the three tubes has a first lumen and is first formed by extrusion through a convention extruding die. The extruder die then gradually bifurcates the first tube, providing a gradual transition between the first tube and the second and third tubes. The lumens in the second and third tubes thus formed remain in uninterrupted fluid communication with the lumen of the first tube. The bifurcation takes place with the first tube to form second and third tubes smoothly and over a transition distance which is easily controlled by the extruder die. The bifurcated second and third tubes are continuous with the first tube making the "Y" tube unitary.

5511965, Apr 30, 1996

Apr 14, 1995

8/421479

David B. Batdorf - Paso Robles CA
Gregory N. Nordgren - Wilsonville OR
Charles A. Schryver - Atascadero CA

Specialty Silicone Fabricators, Inc. - Paso Robles CA

B29C 4722

425381

An apparatus for making extruded tubing having one or more lumens therein with a variable outer diameter. The apparatus is useful for forming tubing of an extrudable material such as an elastomer or thermoplastic. The extrudable material is forced around a mandrel and through a die aperture over a mandrel wherein the inside surface of the tubing is of uniform diameter along its length but the wall thickness varies throughout its length. Such an apparatus may be used, for example, to make kink-resistant tubing. In one embodiment, the aperture in the extrusion die has a variable diameter while the mandrel remains constant. In a second preferred embodiment, a moveable ring with a central aperture is disposed within the extrusion chamber coaxially with the mandrel. The ring is capable of reciprocal motion in the direction of extrusion. During extrusion, when the moveable ring is moved toward the die opening, it constricts the outer diameter of the tubing thus formed.