JPH0636825Y2 - Blood guide needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a blood guide needle directly connected to an extracorporeal circulation blood circuit.

(Prior art and its problems) A circuit for circulating blood extracorporeally is connected to an artificial kidney, plasma separation, etc., and an induction needle for guiding or introducing blood from a blood vessel of a patient is connected to this circuit. Are connected.

For such a guide needle, an indwelling needle composed of an inner needle made of a metal and an outer needle made of a flexible plastic tube and a needle tube made of a metal are used. It will be connected to the extracorporeal blood circuit.

However, such connection work is troublesome and inconvenient in an emergency, and during the connection work, there is a concern that the connection port may come into contact with outside air or foreign matter and be contaminated.

Also, in the past, the air mixed in the blood during the extracorporeal circulation is deflated in a drip chamber provided in the middle of the circuit, but if there is no air bleeding device after the drip chamber, it is removed in the drip chamber. There is a risk that the air that has not been introduced will be introduced into the human body.

In view of such conventional problems, the present invention efficiently removes the air in the blood that has not been deaerated in the drip chamber or the like immediately before the blood that has passed through the extracorporeal circulation blood circuit is returned to the human body. An object of the present invention is to provide a blood guide needle that can save the connection work with the extracorporeal circulation circuit.

(Means for Solving Problems) The present invention is a blood guiding needle directly connected to an extracorporeal blood circuit, which is a plastic outer needle 1 and this outer needle, as shown in the accompanying drawings corresponding to the embodiments. 1 and a metal inner needle 3 which is inserted into the outer needle 1. A hydrophobic filter 6 for bleeding air and a tube connection port 5 are provided on the side of the needle base 2 of the outer needle 1 so as to face each other. The tube 7 of the extracorporeal circulation blood circuit is directly connected to the tube connection port 5, and the rubber stopper 4 is attached to the rear end of the needle base of the outer needle. It is designed to be inserted into.

(Operation) With the inner needle 3 inserted in the outer needle 1, the blood vessel of the patient is punctured. At this time, since the tube 7 of the extracorporeal circulation circuit is directly connected to the needle base 2 of the outer needle 1, the conventional connecting work between the needle and the tubes is omitted.

After the puncture, when the inner needle 3 is pulled out from the outer needle 1, the inner needle through hole opened in the rubber stopper 4 at the rear end of the outer needle is closed by the contracting force of the rubber stopper 4.

In this state, the blood circulates from the outer needle through the tube to the outside of the body, or the treated blood is returned to the body through the tube and the outer needle. At this time, if air is present in the blood, the air will escape from the filter 6 of the outer needle needle base.
This filter has the property of passing gas but not liquid. Further, when the tube connection port is provided on the needle base side portion of the outer needle, blood flows in obliquely with respect to the center axis of the needle base, and air for linear contact with the hydrophobic filter at the opposite position is provided. It can be removed efficiently.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is an outer needle made of a flexible plastic such as polyvinyl chloride resin or polyethylene resin, and a needle base 2 of the outer needle 1
Is made of hard resin.

Reference numeral 3 is an inner needle that is removably inserted into the outer needle 1, and is made of metal such as stainless steel. A rubber stopper 4 such as silicone rubber is attached to the rear end opening of the outer needle base 2, and the inner needle 3 penetrates the rubber stopper 4 from the rear end of the outer needle base 2. Then inserted into the outer needle.

Further, a tube connection port 5 and a filter 6 are provided on the side of the needle base 2, and the tube 7 of the extracorporeal blood circuit is directly connected to the tube connection port 5.
The tube connection port 5 and the filter 5 are provided at opposite positions of the needle base 5 as shown in the figure.

As the filter 6 in the present invention, a filter of a hydrophobic porous membrane which allows gas such as air to pass but does not allow liquid such as blood to pass is used. Specifically, it is a Teflon film or a silicon film.

In addition, in the drawings, 8 is a needle base of the inner needle, and 9 is a wing for fixing the needle.

(Effects of the Invention) According to the present invention described above, the extracorporeal circulation blood circuit and the blood guiding needle are directly connected, so that the labor of connection work as in the conventional case is saved and there is no fear of contamination at the time of connection. . Further, according to the present invention, since the hydrophobic filter for air bleeding and the tube connecting port are provided at the positions opposite to each other in the needle base of the outer needle, the blood flowing from the tube connecting port is linearly treated with the hydrophobic filter. Due to the contact, the air that has not been completely deaerated in the drip chamber in the extracorporeal blood circuit can be efficiently deaerated from the hydrophobic filter.

[Brief description of drawings]

The accompanying drawings are schematic partial sectional views showing an embodiment of the present invention. In the figure, 1 is an outer needle, 2 is an outer needle needle base, 3 is an inner needle, 4 is a rubber stopper, 5 is a tube connection port, 6 is a hydrophobic filter, and 7 is a tube.

Claims (1)

[Scope of utility model registration request] 1. A blood guiding needle directly connected to an extracorporeal circulation blood circuit, comprising a plastic outer needle and a metal inner needle inserted through the outer needle, wherein a needle base side portion of the outer needle is provided. Is provided with a hydrophobic filter for air bleeding and a tube connection port facing each other, the tube of the extracorporeal blood circuit is directly connected to this tube connection port, and a rubber stopper is attached to the rear end of the outer needle base. A blood guide needle, which is attached, and the inner needle is inserted into the outer needle through the rubber stopper.