Abstract: A device for fabricating multi-layer tubing has a reservoir for tubing solution and discharges such solution from an opening in the reservoir bottom. The reservoir is suspended so as to remain level. Extending through the opening is a vertical rod of smaller diameter but itself suspended by a flexible wire so as to remain vertical. Material in the reservoir extrudes as an annulus even in cross-section by passing between the edge of the reservoir opening and the rod. Such extruded material hardens into one layer of the tubing. There is a repetition with a larger reservoir opening and so depositing a larger tube that is dried on and over the first tube. This is repeated as often as desired to get a finished tube of the proper inside and outside diameter.The method is following in succession the steps described above.
Abstract: An intra-aortic balloon includes a flexible catheter having a deformable fitting closing one terminus and a connecting attachment at the other end. Adjacent the fitting, the catheter has a number of perforations all within an elongated balloon surrounding the perforations. One end of the balloon is secured to the fitting and at the other end is secured to the catheter. The connecting attachment is engageable with a removable body to which is secured a manually deformable wire extending through the catheter and into the fitting. The body has a duct open to the interior of the catheter and to the atmosphere. An outwardly opening check valve is in the duct.
Abstract: A disposable aortic perforator has an elongated stem with an exterior stem surface circular-cylindrical about a longitudinal axis and extending between a far end and a near end. A coaxial disc having an exterior circumferential cylindrical disc surface of a first predetermined diameter is separated from the remainder of the stem by an intervening groove leaving an axial shank therebetween. The coaxial disc has a near surface on said disc normal to the axis and meeting the disc peripheral surface substantially at a right angle to form a blunt outside corner that is a non-cutting edge. An elongated tube is telescoped over the stem and is slidable a predetermined distance, about one-third of an inch, on the stem. The tube has an interior, circumferential cylindrical or tube surface of a second predetermined diameter about 0.0002 inches larger than the first predetermined diameter of the stem.
May 19, 1978
Date of Patent:
August 12, 1980
Thoratec Laboratories Corporation
David E. Downie, Robert J. Harvey, John R. Rueff
Abstract: An implanted device for determining the patentcy of a transplanted vein directly connecting the aorta to transfer blood to a coronary artery has a physiologically inert bulb of flexible material disposed and retained in pressure transferring relationship to the distal region of the transplanted vein. A cuff or non-expansible sleeve surrounds the bulb and the vein and is held in position. The bulb has a single opening leading into one end of an implanted catheter. The other end of the catheter opens through a single opening in a thick-walled reservoir implanted in a subcutaneous location convenient for piercing by a hypodermic needle. At least a part of the reservoir wall is able to close upon withdrawal of the needle. The bulb, catheter and reservoir are completely filled, without distention, by an appropriate, usually isotonic, liquid. There may be a break-away connection in the catheter and various radio-opaque indicia for X-ray monitoring.
December 27, 1977
Date of Patent:
February 26, 1980
Thoratec Laboratories Corporation
J. Donald Hill, Robert J. Harvey, David E. Downie
Abstract: A catheter anchor for holding a catheter in position in a patient has a base in the form of a disc with a flat surface normal to a central axis. There is a transverse, resilient bar extending across the disc on the side opposite the flat surface. The bar has at least one reentrant groove in it to receive and grasp the catheter. There may be an additional reentrant groove in the bar expandable by a plug to constrict the catheter groove. Also, there may be a pawl sheet adapted to grip the catheter and abut the bar to inhibit unwanted insertion of the catheter into the patient. From the flat surface of the disc a number of needles extend approximately helically and symmetrically with the axis and with their exposed points engageable with the patient's tissue by rotation. There may also be a central guide needle extending from the flat surface along the axis.
Abstract: A vein preparation and testing device has a rimmed base forming a shallow basin upstanding from which are a head block and a tail block. In the head block is a removable hollow chuck rotatable about an axis and connected to a liquid reservoir on the base and to a pump. The hollow chuck communicates with a hollow head grip having a tube adapted to lie inside a vein. A fastener holds the vein in place on the tube. In the tail block is a removable tail grip mounted to rotate about the same axis. The tail block is movable along the same axis.