Leroy E Groshong

US Patent:

50748718, Dec 24, 1991

Filed:

Dec 7, 1989

Appl. No.:

7/447888

Inventors:

LeRoy E. Groshong - Vancouver WA

Assignee:

EVI Corporation - Portland OR

International Classification:

A61B 1732

US Classification:

606170

Abstract:

A catheter atherotome and method for its use for performing partial atherectomy in an artery and thereby enlarging the lumen effectively available for blood flow through the artery. An expansible cutter head at the distal end of a catheter includes several elongate flexible members mounted in a parallel array and spaced angularly apart from one another about the associated ends of two concentric members of the catheter in such a way that longitudinal and rotary relative movement of the members of the catheter selectively either bows the flexible members arcuately outwardly into a cutting position or draws them into alignment parallel with the catheter. A sharpened edge of a blade carried on at least one flexible member extends circumferentially and is directed toward the catheter's proximal end when the flexible members are bowed. Partial removal of an atheroma is effected by manually pulling the cutter head past an atheroma with the sharpened edge exposed, with the speed, force, and amount of expansion of the cutter head determined by the operator. Removal of cut-away pieces of atherosclerotic plaque material is accomplished either by pull-back of a balloon-tipped catheter or by use of a membrane enshrouding the cutter head to trap the shavings.

US Patent:

51084198, Apr 28, 1992

Filed:

Aug 16, 1990

Appl. No.:

7/568844

Inventors:

Vincent A. Reger - Portland OR
Thomas L. Kelly - West Linn OR
LeRoy E. Groshong - Vancouver WA

Assignee:

EVI Corporation - Portland OR

International Classification:

A61M 2500

US Classification:

606200

Abstract:

A filter useful in tubular organs of the human body, intended primarily for endovascular use during surgical procedures for removal of plaque and other treatment of stenoses in arteries, in order to entrap particles of plaque or other materials freed from the interior wall of an artery while permitting continued flow of blood through the artery during the procedure of treating the stenosis. Several filter elements are fastened in apart-spaced relationship with one another along a flexible elongate member and are large enough to require the entire flow of blood through the artery to pass through the filter elements. An open-mouthed tubular stocking of porous filter material encloses the filter elements and supports the periphery of each filter element. Successive filter elements, progressing in the direction of blood flow, pass only progressively smaller particles. In a preferred embodiment, the mouth of the stocking can be closed to retain particles of material within the filter as it is written from the artery after repair of a stenosis.

US Patent:

45293996, Jul 16, 1985

Filed:

May 3, 1983

Appl. No.:

6/491257

Inventors:

LeRoy E. Groshong - Portland OR
Ronald J. Brawn - Portland OR

Assignee:

Catheter Technology Corporation - Salt Lake City UT

International Classification:

A61M 500
A61M 2500

US Classification:

604 53

Abstract:

The skin and a subjacent body vessel is pierced with a needle mounted on a fluid-fillable chamber at the opposite end of which is a plunger movable into the chamber. In one embodiment, disposed within the needle and chamber is a closed-ended flexible catheter. A flexible stylet is disposed in the catheter. The catheter is drawn through the needle and into the body vessel by pushing into the chamber the plunger which engages the distal portion of the stylet. The closed-ended pliable catheter is drawn into place in the body vessel by the pushing stylet while fluid is simultaneously infused into the body vessel to dilate it and thereby ease the advancement of the catheter with minimal damage to the vessel wall. The chamber and needle are removable from the catheter, leaving it in place in the body for the infusion of fluid. In another embodiment a stiffer, open-ended catheter is used and plunger pushes directly against the catheter to push it into the body vessel.

US Patent:

47722665, Sep 20, 1988

Filed:

May 4, 1987

Appl. No.:

7/045501

Inventors:

LeRoy E. Groshong - Portland OR

Assignee:

Catheter Technology Corp. - Salt Lake City UT

International Classification:

A61M 500

US Classification:

604164

Abstract:

Dilator/sheath assemblies for unstressed placement of catheter tubes into a body cavity of medical patients, which insure a stable axial relationship between concentrically superimposed sheath and dilator so that use is very facile for the medical attendent and insures a predetermined two-step gentle enlargement of a puncture site to accommodate unstressed placement of a catheter tube into a vein or artery through the puncture site and with minimal trauma to the patient.

US Patent:

46717960, Jun 9, 1987

Filed:

Oct 25, 1985

Appl. No.:

6/791392

Inventors:

LeRoy E. Groshong - Portland OR
Ronald J. Brawn - Portland OR

Assignee:

Catheter Technology Corp. - Salt Lake City UT

International Classification:

A61M 2500

US Classification:

604247

Abstract:

Catheter of soft, flexible material is formed with closed end. Fluid opening formed by single slit through tubing wall of such length that valve will open only upon application of predetermined pressure differentials. Removable stiffener member is positioned in catheter, abutting closed end to push catheter into body vessel when inserting.

US Patent:

45498792, Oct 29, 1985

Filed:

May 3, 1983

Appl. No.:

6/491258

Inventors:

LeRoy E. Groshong - Portland OR
Ronald J. Brawn - Portland OR

Assignee:

Catheter Technology Corporation - Salt Lake City UT

International Classification:

A61M 2500

US Classification:

604247

Abstract:

Catheter of soft, flexible material is formed with closed end. Fluid opening formed by single slit through tubing wall of such length that valve will open only upon application of predetermined pressure differentials. Removable stiffener member is positioned in catheter, abutting closed end to push catheter into body vessel when inserting.

US Patent:

45590460, Dec 17, 1985

Filed:

Jul 28, 1983

Appl. No.:

6/518069

Inventors:

LeRoy E. Groshong - Portland OR
Ronald J. Brawn - Portland OR

Assignee:

Catheter Technology Corporation - Salt Lake City UT

International Classification:

A61M 2500

US Classification:

604282

Abstract:

Apparatus for intravenous therapy including hyperalimentation comprises a flexible closed-end catheter having a valve adjacent its proximal end. It is inserted through the skin of a patient and into a vein having a suitably large flow of blood therethrough. A removable internal stiffening member comprising a doubled, twisted flexible wire abuts the proximal closed catheter end. A distal female fluid flow fitting is fixed to the distal end of the stiffening member and is releasably attached to the distal catheter end. The distal end of the catheter has a male coupler allowing releasable connection of the fluid flow fitting of the internal stiffener to a source of intravenous solution which flows by gravity or pump means through the catheter and into the vein.

US Patent:

48388602, Jun 13, 1989

Filed:

Jun 26, 1987

Appl. No.:

7/067700

Inventors:

Leroy E. Groshong - Portland OR
Judson C. Groshong - Beaverton OR
R. James Brawn - late of Portland OR

Assignee:

Pump Controller Corporation - Portland OR

International Classification:

A61M 500
F04B 1902

US Classification:

604152

Abstract:

An infusion pump for administering fluid from a fluid source to a patient comprises a base member having an electric motor for driving a fluid pump housed within a cassette detachably mountable on the base and connectable to the motor. The cassette houses a reciprocative piston and cylinder assembly which both pumps fluid to the patient while simultaneously drawing fluid from the fluid source so as to maintain a continuous flow rate of fluid to the patient. The cassette also houses deformably closable pairs of tubes connecting each of the pump's two fluid chambers to the cassette inlet and outlet respectively to provide the necessary valving to produce continuous flow in cooperation with the reciprocative piston and cylinder assembly. The fluid flow rate is adjustably controlled by a microcomputer which regulates the motor by repeatedly initiating electric motor driving pulses at a predetermined time rate, and terminating them in response to the advancement of the motor beyond one of a plurality of predetermined positions so as to maximize accuracy and reliability of flow rate while compatibly maximizing the power efficiency of the motor for portable applications requiring a battery power source.