Timothy C Nelson

US Patent:

62143700, Apr 10, 2001

Filed:

Apr 9, 1999

Appl. No.:

9/291571

Inventors:

Timothy S. Nelson - Elk River MN
Matthew A. Bergan - Brooklyn Park MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61F 202
A61K 4730
A61K 922

US Classification:

424425

Abstract:

A device and method is disclosed for continuously administering an analgesic to the neuraxis of an organism. The device comprises a polymeric matrix body loaded with the analgesic. The body is implanted in the neuraxis where the analgesic diffuses into the neuraxis.

US Patent:

59809272, Nov 9, 1999

Filed:

Jan 2, 1997

Appl. No.:

8/775528

Inventors:

Timothy S. Nelson - Elk River MN
Matthew A. Bergan - Brooklyn Park MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61F 202
A61K 922
A61K 4730

US Classification:

424425

Abstract:

A device and method is disclosed for continuously administering an analgesic to the neuraxis of an organism. The device comprises a polymeric matrix body loaded with the analgesic. The body is implanted in the neuraxis where the analgesic diffuses into the neuraxis.

US Patent:

63029901, Oct 16, 2001

Filed:

Mar 2, 2000

Appl. No.:

9/517525

Inventors:

Timothy S. Nelson - Elk River MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61M 2500

US Classification:

15624413

Abstract:

An infusion catheter for delivering drugs or other agents to selected sites in an organism, such as a human. In an alternate embodiment, a catheter system is disclosed having an infusion catheter and a pump that may be implanted or disposed outside the organism. In either embodiment, the free end of the catheter bears a rounded tip that has at least one elution hole for discharging an agent or drug to a selected site. The catheter has a tubular inner liner that is integral with the tip. The inner liner and tip are formed from a drug compatible polymeric material that is relatively nonporous and unreactive with the agent to be infused. A biocompatible flexible elastomeric tubular jacket surrounds the inner liner and a portion of the tip excluding that portion containing the elution hole or holes. Since the agent flowing in the catheter is isolated from the jacket while flowing through the catheter, and since the inner liner is relatively nonporous and unreactive with the agent to be used, the agent is prevented from diffusing out of the catheter, adsorbing to the surface of the biocompatible jacket, reacting adversely with the jacket material or becoming exposed to substances diffusing through the jacket.

US Patent:

57023727, Dec 30, 1997

Filed:

Feb 8, 1995

Appl. No.:

8/385498

Inventors:

Timothy S. Nelson - Elk River MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61M 2500

US Classification:

604264

Abstract:

An infusion catheter for delivering drugs or other agents to selected sites in an organism, such as a human. In an alternate embodiment, a catheter system is disclosed having an infusion catheter and a pump that may be implanted or disposed outside the organism. In either embodiment, the free end of the catheter bears a rounded tip that has at least one elution hole for discharging an agent or drug to a selected site. The catheter has a tubular inner liner that is integral with the tip. The inner liner and tip are formed from a drug compatible polymeric material that is relatively nonporous and unreactive with the agent to be infused. A biocompatible flexible elastomeric tubular jacket surrounds the inner liner and a portion of the tip excluding that portion containing the elution hole or holes. Since the agent flowing in the catheter is isolated from the jacket while flowing through the catheter, and since the inner liner is relatively nonporous and unreactive with the agent to be infused, the agent is prevented from diffusing out of the catheter, adsorbing to the surface of the biocompatible jacket, reacting adversely with the jacket material or becoming exposed to substances diffusing through the jacket.