US3885894A — Roller-type blood pump

Claim 1

Independent Claim 350 words

In a roller pump of the type having a base, an upstanding wall atop the base defining a concave semi-cylindrical raceway, latch means located at opposite ends of said raceway adapted to releasably hold an arcuate section of flexible tubing in position against said raceway, a shaft journalled for rotation within the base about an axis coincident with the cylindrical surface of said raceway, and an impeller assembly movable by said shaft for causing fluid movement through the tubing by collapsibly distorting said tubing, the improvement which comprises: providing said impeller assembly with an elongate arm mounted on the shaft for conjoint rotation about an axis intermediate the ends of said arm; a pair of roller frames each having one end adapted for attachment to an end of the arm and another end notched to accept a roller for rotation within said notch; a cylindrical roller mounted for rotation within the notched end of each roller frame; telescopable connecting means interconnecting said one end of each roller frame to an end of the arm for independent relative movement between an extended position and a retracted position, said connecting means including at least one rod projecting from one of said interconnected ends and a corresponding opening positioned and adapted to telescopically receive said rod in the other of said interconnected ends; biasing means interposed between said interconnected ends of said arm and roller frame independently biasing said roller frame into extended position; and, adjustable stop means operative upon actuation to independently limit the maximum extension of each roller frame relative to the end of said arm to which said roller frame is connected, said stop means including an enlarged head carried by A portion of said rod telescoped within the opening receiving said rod and a section of said opening cooperating to define a shoulder positioned to engage said enlarged head upon movement of said roller frame toward extended position, said head being mounted for adjustment in the direction of the length of said rod to vary the distance separating said head from the interconnected end from which said rod projects.

Claim 2

Dependent Claim 350 words

In a roller pump of the type having a base, an upstanding wall atop the base defining a concave semi-cylindrical raceway, latch means located at opposite ends of said raceway adapted to releasably hold an arcuate section of flexible tubing in position against said raceway, a shaft journalled for rotation within the base about an axis coincident with the cylindrical surface of said raceway, and an impeller assembly movable by said shaft for causing fluid movement through the tubing by collapsibly distorting said tubing, the improvement which comprises: providing said impeller assembly with an elongate arm mounted on the shaft for conjoint rotation about an axis intermediate the ends of said arm; a pair of roller frames each having one end adapted for attachment to an end of the arm and another end notched to accept a roller for rotation within said notch; a cylindrical roller mounted for rotation within the notched end of each roller frame; telescopable connecting means interconnecting said one end of each roller frame to an end of the arm for independent relative movement between an extended position and a retracted position, said connecting means including at least one rod projecting from one of said interconnected ends and a corresponding opening positioned and adapted to telescopically receive said rod in the other of said interconnected ends; biasing means interposed between said interconnected ends of said arm and roller frame independently biasing said roller frame into extended position; and, adjustable stop means operative upon actuation to independently limit the maximum extension of each roller frame relative to the end of said arm to which said roller frame is connected, said stop means including an enlarged head carried by A portion of said rod telescoped within the opening receiving said rod and a section of said opening cooperating to define a shoulder positioned to engage said enlarged head upon movement of said roller frame toward extended position, said head being mounted for adjustment in the direction of the length of said rod to vary the distance separating said head from the interconnected end from which said rod projects.

Claim 3

Dependent Claim 58 words

The improvement as set forth in claim 1 in which: the telescoped portion of said rod terminates in an end containing an internally-threaded socket; an externally-threaded member is screwed into said internally-threaded socket forming an adjustable extension of said rod; and, in which the enlarged head is carried by a portion of said externally-threaded member outside said socket.

Claim 4

Dependent Claim 88 words

The improvement as set forth in claim 1 in which: the openings within which the rods telescope lie in transversely-spaced parallel relation to one another on opposite sides of the axis of shaft rotation and open onto both ends of the arm; the enlarged head is accessible through the end of said opening opposite the end into which the rod carrying said head enters; and, in which the portion of said head accessible through said end of said opening is shaped to receive an adjusting tool inserted therethrough.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-05-26	1978-11-25	1979-05-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-05-26	1982-11-25	1983-05-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-05-26	1986-11-25	1987-05-27	$7700.00	Window Closed / Lapsed

Roller-type blood pump

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