Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-10-23
1999-03-09
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604165, 604 51, A61M 500
Patent
active
058793330
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/AU96/00236 filed Apr. 23,1996.
FIELD OF THE INVENTION
This invention relates to fine bore catheter and to a system for inserting a fine bore catheter into a vein.
BACKGROUND OF THE INVENTION
As used in this specification and in the appended claims, the term fine bore catheter tube means a catheter tube having an outside diameter of less than 2.0 mm and an internal bore of less than 1.5 mm. Similarly fine bore catheter means a catheter having a fine bore catheter tube.
Fine-bore silicone catheters allow long term phlebitis (inflammation) free infusion of intravenous nutrition into peripheral veins such as leg and arm veins. They also create less trauma to a patent's body tissue than a larger bore catheter and have a wider range of applications than a larger bore catheter. Such a fine-bore catheter can be as effective as a larger bore catheter centrally placed in a main vein in the torso or chest of a patient such as infraclavicular sub clavian or jugular vein. Placing a larger catheter in a main vein has inherent risks: in particular sepsis and thrombosis can occur. Dedicated specialised support teams are required to monitor patients subjected to central venous cannulation yet the risks persist. However, because of the problems associated with introducing fine bore catheters into peripheral veins, central venous cannulation, despite the potentially life threatening risks, remains the current method of choice for administration of intravenous nutrition.
The current method of placing catheters in peripheral veins requires taxing hand to eye coordination and uses risky "catheter through needle" techniques with which it is possible to cut the catheter tube on the needle being used to introduce the catheter in a peripheral vein and thus requires specially trained personnel. Hence central venous cannulation despite the potential life threatening risks remains the current method of choice for administration of intravenous nutrition.
The present invention seeks to provide an improved system for the insertion of very fine catheters into veins, particularly peripheral veins
SUMMARY OF THE INVENTION
According to the present invention there is provided a system for introducing a fine bore catheter into a vein including: distal end and a proximal end, the cannula unit further comprising a hub enclosing the proximal end of the sheath, the cannula unit being adapted to receive an introducing needle for introducing the distal end of the sheath of the cannula into a vein; and a body portion located at the proximal end of the catheter unit, and a catheter tube extending from the body portion to the distal end of the catheter unit characterised in that the catheter tube is a fine bore catheter tube, in that the hub of the cannula unit defines guide means adapted to receive and guide the distal end of the catheter tube into the proximal end of the cannula sheath so that the catheter tube can be guided into and then fed along the sheath, and in that the hub of the cannula is adapted to receive and enclose at least a portion of the body of the catheter in a locking arrangement which substantially prevents the catheter body moving relative to the hub of the cannula unit.
Conveniently the proximal end of the catheter defines a luer lock or similar means for attaching the proximal end of the catheter to a syringe or other fluid delivery device.
It is preferred that the bore of the lumen of the catheter is of constant diameter from the proximal end to the distal end. This reduces the risk of blood products clotting the bore of the lumen.
It is preferred that the external diameter of the catheter is between 0.6 mm and 1.2 mm.
The internal bore of the catheter may be 0.3 to 0.8 mm.
It is preferred that the system includes a introducing needle for insertion into the cannula for piercing a vein. The needle comprises a needle having a distal end adapted to pierce a vein and the proximal end of the needle is mounted in a hollow hub.
The invention also provides a catheter unit, having a distal end
REFERENCES:
patent: 4931039 (1990-06-01), Coe et al.
Microcatheters Pty Ltd
Yasko John D.
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