Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-07-01
1996-04-30
Hirsch, Paul J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, A61M 2506, A61B 1734
Patent
active
055120520
DESCRIPTION:
BRIEF SUMMARY
The present invention is directed to a catheterization set for placing a catheter in a blood vessel, comprising a puncture needle provided with a needle hub carrying a grip device, a catheter surrounding the puncture needle and having a catheter hub arranged thereon, and a guide wire to be axially displaced in the lumen of the puncture needle.
For measurement of pressures in vessels (arterial blood pressure), administration of infusions and blood sampling, it is required that arteries and central veins be punctured and so-called in-dwelling catheters be set, which are provided as short catheters having a catheter hub for connection to a liquid transfer device. The catheter accommodates a puncture needle with its ground tip slightly protruding beyond the front end of the catheter. A set of this type is known from U.S. Pat. No. 3,312,220. For obtaining a smooth transition from the puncture needle to the thicker catheter during puncture, the tip of the catheter is on the outside beveled towards the front. However, the continuous transition from the catheter to the outer periphery of the puncture needle is not capable of avoiding a disadvantageous widening of the puncture hole and the difficulties in penetrating the skin and the vessel wall, resulting in reduced precision of the puncture. This setback is all the more aggravating since this known set lacks a grip device so that the set has to be gripped directly on the cylindrical needle hub, which does not allow for a firm hold of the set.
Frequently, it is suitable to use a guide wire for placement of the catheter. This guide wire is has a greater length than the catheter. For avoiding injuries to the patient, guide wires have a soft tip. Advantageously, the guide wire, being stiffer than the catheter, can be advanced into the vessel with higher aiming accuracy than the catheter and at the same time stiffens the catheter being advanced on it and moves the catheter to its desired location in a controlled manner. This method of placing a catheter is called "Seldinger technique" and is used both in short and long catheters.
Generally, when applying this technique, the blood vessel is first punctured by the set comprising the puncture needle and the short catheter mounted thereon, or by use of a puncture needle alone. Subsequently, the guide wire is shifted into the vessel through the placed puncture needle, and the catheter is then advanced into the vessel while moving over the guide wire. Thereafter, the guide wire is withdrawn and discarded. The separately used components are inconvenient to the user because the threading or plug-on maneuver of the components is time-consuming and requires heightened attention.
To avoid the operational disadvantages of separate components, these were combined into one catheterization set which can be handled as a unit. A catheterization set of this type is described in EP-A-00 93 164. At the rear (proximal) end of this known catheterization set, the needle hub of the puncture needle assembled to the short catheter is provided with a long tube member containing the guide wire. By means of a slider projecting into the interior of the tube member through a slot, the guide wire can be axially displaced to have its front end projecting out of the puncture needle. Because of its considerable length and the lack of a grip device, this catheterization set is difficult in handling, which adversely affects the accuracy of puncture.
The puncture is performed in the retracted condition of the guide wire so that, after successful puncture, blood will flow back within the puncture needle and enter the transparent needle hub. However, since the set is gripped on this needle hub, the fingers of the user block the view onto the needle hub so that the withdrawal of blood into the needle hub will be detected late or not at all. Also this set suffers from the disadvantage that, during puncture, not only the puncture needle but also the catheter surrounding it has to penetrate the puncture hole. Due to the resistance offered by the skin, the penet
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B. Braun Melsungen AG
Hirsch Paul J.
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