US 5,178,607 AGranted

Blood aspiration assembly septum and blunt needle aspirator

OwnerLawrence A. Lynn, James E. Coleinventors

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Abstract

A blood aspiration assembly has an aspirator receiver. The receiver has a housing with a rigid casing and a resilient plug, and a liquid flow chamber. The chamber has an offset lower wall surface, to create turbulence to remove air bubbles during initial set up. The offset wall can be elevated with an intermediate part of larger cross section to accommodate the blunt needle. The plug has a slit or perforation to allow passage of a blunt needle therethrough. The plug can have two parts of different compliance, with aligned slits or perforations. The blunt needle tip can be rounded or flat, with a side opening for the needle bore. The contour of the needle tip and the design of the plug are correlated such that the working force required to penetrate the needle tip into the plug perforation is considerably less than the force required for said needle tip to penetrate normal intact human skin of the hands or arms. A stop prevents the needle from contacting the aspiration chamber wall.

Claims35

Dependent claims

In a fluid-filled extra-corporeal blood aspiration system for sampling pressurized blood from the human body, the system being for connection with a catheter having a bore in fluid connection with a pressurized blood vessel, the system having means for elevating the fluid pressure above the pressure within said blood vessel so that fluid flows from the system into the blood vessel and the system having means for reducing said fluid pressure below the pressure within said blood vessel so that blood flows from said blood vessel into said system, improvements comprising:

an aspirator including an axially extending cannula having a blunt distal tip, said cannula having a bore with first and second openings adjacent opposite ends thereof, said aspirator further including a receptacle in communication with said bore through said second opening thereof;
an aspirator receiver forming part of the blood aspiration system and including a housing having a flow channel for communication with the human vasculature for flowing blood through the flow channel, said housing carrying a receiver portion, the receiver portion having an outer surface and an inner surface and an upwardly projecting cavity along said inner surface, the receiver portion being penetrable by said cannula to locate the first opening of said cannula in communication with said flow channel and enable blood flow from said flow channel through said first opening, said bore and said second opening into said receptacle, said flow channel ramping upwardly into said upwardly projecting cavity, said upwardly projecting cavity functioning to receive blood from said upward ramping flow channel;
said aspirator receiver portion being preperforated to form a receiver channel for receiving the cannula upon penetration thereof by said cannula, said housing receiver portion being formed of a resilient material whereby said receiver channel is normally closed.

Apparatus for use with a blood aspiration system for sampling blood from the human body, comprising:

an aspirator including an axially extending cannula having a distal tip, said cannula having a bore with first and second openings adjacent opposite ends thereof, said aspirator further including a receptacle in communication with said bore through said second opening thereof;
an aspiration receiver forming part of the blood aspiration system and including a housing having a flow channel for communication with the human vasculature for flowing blood through the flow channel, said housing having a portion penetrable by said cannula to locate the first opening of said cannula in communication with said flow channel and enable blood flow from said flow channel through said first opening, said bore and said second opening into said receptacle, said portion of said housing having an inner surface and an outer surface interfacing with the flow channel and ambient atmosphere, respectively, a portion of said inner surface having a concave recess portion, a bottom wall of said housing having a convex hump portion, said hump portion being complementarily shaped to said recess portion to matingly engage the same, said hump portion having a longitudinal cutout defined therein which has an upwardly inclined portion and a downwardly inclined portion and which defines a portion of said flow channel;
said housing portion forming an opening upon penetration of said housing portion by said cannula for receiving said cannula, said housing portion being formed of a resilient material for sealing said opening upon withdrawal of said cannula from said housing portion.

Apparatus for use with a blood aspiration system for sampling blood from the human body, comprising:

an aspirator including an axially extending cannula having a distal tip, said cannula having a bore with first and second openings adjacent opposite ends thereof, said aspirator further including a receptacle in communication with said bore through said second opening thereof;
and
an aspiration receiver forming part of the blood aspiration system and including a housing having a flow channel for communication with the human vasculature for flowing blood through the flow channel, said housing having a septum penetrable by said cannula to locate the first opening of said cannula in communication with said flow channel and enable blood flow from said flow channel through said first opening, said bore and said second opening into said receptacle;
said septum forming an opening upon penetration of said septum by said cannula, said septum being formed of a resilient material for sealing said opening upon withdrawal of said cannula from said housing portion;
said septum having an inner surface and an outer surface interfacing with the flow channel and ambient atmosphere, respectively, a portion of said inner surface having a concave recess portion, a bottom wall of said housing having a convex hump portion, said hump portion being complementarily shaped to said recess portion to matingly engage the same, a longitudinal cutout being defined in said hump portion, said cutout having an upwardly inclined portion and a downwardly inclined portion and defining a portion of said flow channel which induces turbulent flow.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/594,677Filed 10 Oct 1990 · division
Priority: 31 Jul 1987
Granted: 12 Jan 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

A61B 5/150992
Devices for taking samples of blood: blood sampling from a fluid line external to a patient, such as a catheter line, combined with an infusion…
A61B 5/15003
Source of blood: for venous or arterial blood
A61B 5/150221
Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing…:…
A61B 5/150236
Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing…:…