Peter D Spohn

US Patent:

6358460, Mar 19, 2002

Filed:

Dec 23, 1999

Appl. No.:

09/472329

Inventors:

George Purtell - Westford MA
Peter D. Spohn - Brookline NH

Assignee:

TFX Medical Incorporation - Jaffrey NH

International Classification:

B29C 4704

US Classification:

264491, 264113, 264119, 264127, 26417126, 264245, 264296, 264320

Abstract:

Methods are disclosed for producing multi-layer peelable sheaths having formed tips, for use as medical introducer devices, e. g. , sheaths for inserting a catheter or the like into a patient. The methods include the steps of preparing a first composition blend for forming an inner layer of the multi-layer sheath, preparing a second composition blend for forming an outermost layer of the multi-layer sheath, combining the first and the second composition blends into a multi-layer pre-form, processing the multi-layer pre-form for producing tubing, and forming a tip at one end of the tubing using a thermal process, thereby producing the multi-layer sheath having the inner layer, the outermost layer, and the formed tip. The methods of the present invention include adding a detectable material to the blend used for making the inner layer for facilitating external visualization of the multi-layer sheath, thereby achieving a sheath with a formed tip having no visible discoloration. The methods also incorporate a reduced sintering process for achieving an optimally cured, peelable sheath having excellent tear properties.

US Patent:

6454744, Sep 24, 2002

Filed:

Dec 23, 1999

Appl. No.:

09/470693

Inventors:

Peter Dwight Spohn - Brookline NH
Dean David Dinsmore - New Ipswich NH

Assignee:

TFX Medical, Inc. - Jaffrey NH

International Classification:

A61M 5178

US Classification:

60416405, 604161, 604158, 60416401

Abstract:

The present invention provides improved medical introducer devices which incorporate a single or multi-layer PTFE peelable sheath. Devices of the present invention are suitable for use in inserting an ancilliary medical device, e. g. , a catheter, guide wire and the like, into a patient. Methods of the present invention also are disclosed which employ a precision sintering process in order to produce sheaths having excellent tear properties and optimal peelability.

US Patent:

6482482, Nov 19, 2002

Filed:

Jun 29, 1998

Appl. No.:

09/106704

Inventors:

Peter Dwight Spohn - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 2728

US Classification:

428 357, 138137, 428 369, 428 3691, 428420, 428421, 4284741, 525 64, 525 66, 525 68, 525 72, 525902

Abstract:

Structures for transport and containment of hydrocarbon fluids for motorized transportation vehicles are made from a blend of polar-grafted fluoropolymer dispersed in a matrix of polar polymer. The blend can be in a component element of a composite structure.

US Patent:

6524671, Feb 25, 2003

Filed:

Mar 12, 1998

Appl. No.:

09/041323

Inventors:

Peter Dwight Spohn - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 2514

US Classification:

428 357, 428 366, 428 367, 428421, 428422, 4284744, 4284749, 4284758, 4284763

Abstract:

Coextruded layers of polyamide and fluoropolymer adhere to one another without an intervening tie layer by adhesive activation of polyamide of the polyamide layer, e. g. by incorporating into the polyamide layer a dispersed phase of maleic anhydride-grafted ethylene/propylene/diene copolymer. The fluoropolymer is a copolymer of ethylene with perhalogenated comonomer or a copolymer of tetrafluoroethylene with perfluorinated comonomer.

US Patent:

6559238, May 6, 2003

Filed:

May 20, 1999

Appl. No.:

09/315186

Inventors:

Paul Douglas Brothers - Chadds Ford PA
Patrick Edward Lindner - Parkersburg WV
Peter Dwight Spohn - Jaffrey NH

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08J 324

US Classification:

5253263, 525381, 525382, 525374

Abstract:

Melt-fabricable thermoplastic fluoropolymer having pendant functional groups is thermally cross-linked in the presence of polyfunctional nucleophile.

US Patent:

6645590, Nov 11, 2003

Filed:

May 24, 1999

Appl. No.:

09/317707

Inventors:

Peter Dwight Spohn - Jaffrey NH

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 516

US Classification:

428 369, 428421

Abstract:

Articles such as tubing and wire insulation made from fluoropolymer having functional groups exhibit improved mechanical properties.

US Patent:

6663595, Dec 16, 2003

Filed:

May 21, 2002

Appl. No.:

10/153435

Inventors:

Peter Dwight Spohn - Brookline NH
Dean David Dinsmore - New Ipswich NH

Assignee:

TFX Medical, Inc. - Jaffrey NH

International Classification:

A61M 5178

US Classification:

604161, 60416405, 604158, 60416401

Abstract:

The present invention provides improved medical introducer devices which incorporate a single or multi-layer PTFE peelable sheath. Devices of the present invention are suitable for use in inserting an ancilliary medical device, e. g. , a catheter, guide wire and the like, into a patient. Methods of the present invention also are disclosed which employ a precision sintering process in order to produce sheaths having excellent tear properties and optimal peelability.

US Patent:

7098271, Aug 29, 2006

Filed:

Jan 14, 2003

Appl. No.:

10/341885

Inventors:

Paul Douglas Brothers - Chadds Ford PA, US
Patrick Edward Lindner - Kennett Square PA, US
Peter Dwight Spohn - Brookline NH, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 8/32

US Classification:

525285, 5253263, 525374, 525378, 525379, 525381, 525382

Abstract:

Melt-fabricable thermoplastic fluoropolymer having pendant functional groups is thermally cross-linked in the presence of polyfunctional nucleophile.