Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1996-11-06
1998-08-18
Buiz, Michael Powell
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604905, 604 32, 604248, 604280, A61M 2500
Patent
active
057953406
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a microcatheter set in particular an epicutaneo cava microcatheter set, consisting of a microcatheter, an easy-lock catheter connection device with a hose and a standard Luer lock connector.
Above all in the field of neonatology, for the treatment of very undeveloped premature babies who cannot yet be fed orally with milk, it is necessary for modern intensive medical care that there exists the possibility of parenteral alimentation with high-percentage nutrient-rich infusion solutions which, however, can only be applied centrally by means of catheters through venous blood vessels of a wide lumen. A catheter technique which has proved a success in particular in the field of neonatology is the one according to Shaw which uses epicutaneo cava microcatheters. Respective catheters are available on the market in a set. Here the different infusion solutions are usually infused by means of accurately metering injection pumps via distributors and adapters through the connected microcatheter into a large central body vein.
However, in this connection, the following unsolved clinical/pharmacological problems occur: The microcatheter set consisting of a Luer lock adapter, connecting hose, easy lock catheter connection, and a microcatheter, has, as a whole, a dead space volume which is too large. And, in particular when highly effective pharmacological preparations with cardiovascular action (e.g. catecholamine) are added to the infusion fluid --which happens quite often in practice --this means, however, that when, for example, a partially or completely obstructed catheter is flushed or when drugs are administered, that the said large dead space fluid volume with pharmacological preparations influencing the circulatory system will get into the blood stream as a bolus within a very short time. Possible results thereof are severe circulation sensations which, in the case of small premature babies, are possibly followed by life-threatening cerebral hemorrhages. Thus, due to the aforesaid reasons, in the case of partial or complete obstructions, the microcatheters may only be flushed if infusion solutions are used which, pharmacologically, are as indifferent as possible. The same also applies to the administration of medicine. This means in practice, however, that a second access to a vein of the patient has to be created which means discomfort for the patient and the attending physician, in particular in the case of small premature babies and new-born babies. The same is also true for another alternative, namely the use of central double-lumen vein catheters.
SUMMARY OF THE INVENTION
The object of the present invention is to further develop a microcatheter set according to in particular an epicutaneo cava microcatheter, an easy-lock catheter connection device with a hose and a standard Luer lock connector such that the above-cited clinical problems can be solved.
Said object is solved by means of a microcatheter set of the generic type which shows the characterizing features of Luer lock connectors with a minimized dead space, micro-lumen hoses and an easy-lock catheter connection with a minimized dead space being used for the general reduction of the dead space of the microcatheter set, and adjacent to the patient and the catheter and closely to and in front of the easy-lock catheter connection with a small dead space, a flushing and medicine application device being additionally arranged.
Further advantageous aspects of the inventive solution result from the description herein.
BRIEF DESCRIPTION OF THE DRAWINGS
Further details and advantages of the invention will be explained in detail by means of an embodiment illustrated in the drawings, wherein
FIG. 1 is a perspective view of a microcatheter set according to the invention,
FIG. 2 is a longitudinal section through a microcatheter with inserted tubule, and
FIG. 3 an embodiment of an easy-lock catheter connection device according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows in a pe
REFERENCES:
patent: 4588402 (1986-05-01), Igari et al.
patent: 5104387 (1992-04-01), Pokorney et al.
patent: 5156598 (1992-10-01), Skakoon et al.
patent: 5466228 (1995-11-01), Evans
Buiz Michael Powell
Sadula Jennifer R.
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