Catheter attachment for blood sampling

• US 4,230,128 A
• Filed: 03/30/1978
• Issued: 10/28/1980
• Est. Priority Date: 03/30/1978
• Status: Expired due to Term

• Current Assignee: Rene S. Aramayo
• Original Assignee: Rene S. Aramayo
• Inventors: Aramayo, Rene S.
• Primary Examiner(s): Michell, Robert W.
• Assistant Examiner(s): Kruter, J.
• Application Number:
  US05/891,888
• Time in Patent Office: 943 Days
• Field of Search: 128/274, 128/214 R, 128/214 B, 128/276, 128/214.2, 128/214.4, 128/2 F, 128/DIG. 5, 128/1 R, 137/244
• US Class Current: 600/576
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150221 Valves
• CPC Class Codes: A61B 5/150992 Blood sampling from a fluid line external to a patient, such as a catheter line, combined with an infusion line; blood sampling from indwelling needle sets, e.g. sealable ports, luer couplings, valves tubing connectors and couplings A61M39/00
• CPC Class Codes: A61M 39/02 Access sites
• CPC Class Codes: Y10T 137/4336 Cleaning member reciprocates in passage

Abstract

A catheter attachment to be utilized in conjunction with an arterial catheter for blood sampling purposes is disclosed. The attachment includes a housing adapted to be fixedly secured to the catheter, and a stopcock operatively connected to the housing for controlling the flow of blood to a sampling syringe. A sealing stylet is also disposed within the housing in a reciprocal manner so as to be axially inserted within, or withdrawn from, the catheter during non-sampling and sampling periods. In order to insure the disposition of the stylet within the catheter during non-sampling periods, a locking mechanism is also provided which prevents the axial displacement or withdrawal of the stylet from the catheter.

Claims

1. An attachment to be utilized in conjunction with a catheter and syringe, comprising:

housing means, adapted to be fixedly secured to a catheter, comprising a housing wall formed as a thin-walled structure and fabricated of a resilient plastic material and fluid flow passageway means for fluidically connecting said housing means with a catheter when secured thereto;

mounting means on said housing, adapted for mounting a syringe thereon and providing fluid connection therewith with said fluid flow passageway means;

a sealing stylet reciprocatively disposed within said housing between two extreme positions for periodically blocking the flow of fluid through said fluid flow passageway means, said fluid flow to said housing being blocked when said stylet is disposed in said first position, and said fluid being permitted to flow to said housing and said mounting means when said stylet is disposed in said second position;

handle means for manipulating said stylet between said two extreme positions;

a control means for periodically blocking the flow of fluid from said fluid flow passageway means through said mounting means; and

means for maintaining said stylet substantially sterile comprising normally closed slot means defined within said housing wall through which said means for manipulating said stylet projects;

whereby said slot means is substantially closed, except within the immediate vicinity of said handle means, so as to maintain the interior of said housing substantially sterile.

2. The attachment as set forth in claim 1, wherein:

said second control means is a stopcock disposed within said mounting means.

3. The attachment as set forth in claim 1, further comprising:

means for locking said sealing stylet in said first extreme position.

4. The attachment as set forth in claim 3, wherein said locking means comprises:

shoulder means defined upon said housing; and

means defined upon said sealing stylet for engaging said shoulder means.

5. The attachment as set forth in claim 4, further comprising:

cut-out means defined within said housing and operatively associated with said shoulder means; and

said sealing stylet means is rotatable into and out of said cut-out means for operatively engaging or disengaging said shoulder means.

6. The attachment as set forth in claim 1, wherein:

said housing means is elongate and substantially cylindrical;

said fluid flow passage means is an axial conduit;

said sealing stylet is reciprocatingly axially disposed within said conduit.