Brack Gillium Hattler, III
Physician at Dallas St, Denver, CO

4406656, Sep 27, 1983

Jun 1, 1981

6/268766

Brack G. Hattler - Denver CO
Ronnie D. Richards - Arvada CO
William J. Horgan - Littleton CO

A61M 2500

604280

A venous catheter having a central flexible lumen with a formed fluid passageway therein and a plurality of collapsible lumens mounted around the periphery of the central flexible lumen also having formed fluid passageways therein. The central flexible lumen being formed of material which is capable of retaining its shape with or without fluid flowing therethrough. Each collapsible lumen being formed from material which is normally collapsed in a small cross-sectional area and which is further capable of expanding when fluid is flowing therein to a cross-sectional area much greater than that when collapsed. The catheter being capable of being inserted through the center of an insertion needle in the collapsed state into the vein of a patient.

4911689, Mar 27, 1990

Apr 17, 1989

7/338581

Brack G. Hattler - Denver CO

A61M 3700

604 26

A percutaneous oxygenator has a Y-shaped tubular connector and a number of hollow, gas-permeable fibers. One end of each fiber is located in the first upper arm of the connector. The other end of each fiber is located in the other upper arm of the connector, with each fiber forming a loop extending out of the lower opening of the connector. To guide insertion of the device into a patient's vein, and to provide structural support for the fiber loops, a support member extends downward from the connector with an aperture at is distal end. Each of the fiber loops pass through this aperture. The device is inserted through a single small incision into the patient's venous system. An oxygen supply is attached to one of the upper arms of the connector. Oxygen flows through the hollow fibers and diffusion through the fiber wall into the blood. Carbon dioxide diffuses across the fiber wall from the blood into the interior of the fiber tubes.

4846791, Jul 11, 1989

Sep 2, 1988

7/241070

Brack G. Hattler - Denver CO
Irvin Furman - Denver CO

Advanced Medical Technology & Development Corp. - Denver CO

A61M 2500

604 43

A multi-lumen catheter is formed by first introducing one end of an expandable tube into the blood vessel. A divider is then inserted into the distal end of the tube and extends the length of the tube, thereby dividing the tube into a plurality of the separate lumens. Insertion of the divider causes radial expansion of the tube which substantially seals the opening in the wall of the vessel. In one embodiment, the divider has a hollow triangular cross-section which creates four separate lumens. A series of raised protrusions extending outwardly from the sides of the divider prevent collapse of the tube against the divider.