JPH0716219A - Method and instrument for collecting blood from self-retaining catheter - Google Patents

Abstract

PURPOSE:To collect blood sanitarily to a high degree without complicated work. CONSTITUTION:Each end of two cylinders 2a and 2b is sealed, and pistons 5a and 5b are slidably installed to the opening sides at the other ends. Stoppers are attached to the cylinders in such a way that each piston 5 is limited in movement beyond a specified point within the cylinders 2. One end of each fluid path 10a and 10b communicating with spaces within the respective cylinders 2 is opened to an insertion port 8 which can be inserted into the blood collecting port 12 of a catheter 11, and the other ends of the aforesaid fluid paths are separately opened. The insertion port 8 of the blood collecting equipment 1 so constituted as mentioned above is inserted into the blood collecting port 12 of the catheter 11, the piston 5a of one cylinder 2a is drawn out first, so that blood mixed with supplemental fluid within the catheter 11 is thereby collected. Next, the piston 5b of the other cylinder 2b is drawn out, so that blood is collected out of a blood vessel. After that, the piston 5b drawn out first is pushed back, so that blood is sent back to a human body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to blood collection using a catheter that is left in a blood vessel of a human or animal and used for blood pressure measurement or blood collection, and particularly considering hygiene and labor of workers. The present invention relates to a method for collecting blood from an indwelling catheter for blood vessels and a blood collecting instrument used therefor.

[0002]

2. Description of the Related Art A catheter is used for indwelling in a blood vessel of a person or an animal and inducing blood in the blood vessel to measure blood pressure and collect blood. Generally, a catheter is a synthetic resin tube having a diameter of about 2 mm and a length of about 15 cm. The tip of the catheter reaches the inside of the blood vessel, and the other end of the catheter is left protruding outside the body to collect blood, medicine, It is used for fluid replacement and blood pressure measurement.

What is necessary for such an indwelling catheter is to prevent blood in the catheter from coagulating. Blood doesn't clot when it's flowing, but when the flow stops, it quickly tries to clot. Of course, it does not coagulate when it is flowing in the blood vessel, but the catheter is attached in a condition that it is a tributary out of the blood vessel, so that the blood that has entered the catheter is stagnant because there is no place to flow. And begins to solidify. If the blood in the catheter is coagulated, the catheter becomes clogged, making it impossible to measure blood pressure and collect blood. For this reason, a replacement fluid such as physiological saline is constantly flowed at a pressure higher than the pressure of blood in the catheter.

When this replacement fluid is flowing into the catheter,
If blood is collected as it is, much blood in the catheter containing a large amount of replacement fluid will be collected. In this case, although blood was collected to investigate the components in blood, it cannot be used as accurate blood data. Therefore, as shown in FIG. 7 to FIG. 10, conventionally, the work of collecting blood in the catheter with a blood collecting device and then collecting blood with another blood collecting device has been performed. That is, in FIG. 7, the replacement fluid c is poured into the catheter b that has reached the blood vessel a. When collecting blood, the three-way stopcock d is turned as shown in FIG. 8, and the blood containing the replacement fluid c in the catheter b is collected by the blood collecting device e. Next, as shown in FIG. 9, a separate blood collecting device f collects blood that has flowed from the blood vessel a and is not mixed with the replacement fluid c. After that, as shown in FIG. 10, the operation of returning the blood mixed with the replacement fluid c initially collected by the blood collecting device e into the blood vessel a was performed.

[0005]

The problems of the conventional methods as described above are problems of the labor of the operator and
It is a hygiene problem. First, it is extremely troublesome to replace two blood collecting devices e and f alternately by using two separate blood collecting devices e and f. In addition, a sanitary problem occurs that the tip of the blood collecting device e comes into contact with air or an object to be soiled and bacteria are attached while the blood collecting device e that first collected blood is temporarily placed for another work. . This unsanitary blood sampling device e
To return blood into the blood vessel a by using is to inadvertently send bacteria and impurities into the blood, and it must be said that a medical action extremely inappropriate for the health of the patient is being performed.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to smoothly collect blood by reducing the labor of the operator, and it is possible to return the blood mixed with the replacement fluid, and also in terms of hygiene. An object of the present invention is to provide a blood collection method from a blood vessel indwelling catheter that enables extremely safe blood collection work, and a blood collection instrument used therefor.

[0007]

The blood collecting device used in the present invention has two cylinders. The cylinder has a tubular shape such as a cylindrical shape or each tubular shape. One end side of the cylinder is sealed and the other end side is opened. A piston is slidably mounted in each cylinder from the opening side. On the surfaces of the cylinder and the piston that slide with each other, a step is provided so as to be caught on one side, and on the other side, a stopper is provided such as a portion for catching on the step. Even if the piston slides in the cylinder, the stopper prevents the piston from sliding beyond a certain level and prevents the piston from slipping out of the cylinder. The internal space of the cylinder communicates with the outside through a fluid passage, and one end of the fluid passage opens from the sealed side of the cylinder and the other end opens into a small-diameter insertion portion. The fluid paths communicating with each cylinder are individually opened to the insertion portion.

When collecting blood using the blood collecting device as described above, the insertion port of the blood collecting device is inserted into the blood collecting port of the catheter. Turn the stopper so that the artery and the blood sampling port are in communication,
First, the piston on one side is pulled, and blood containing the replacement fluid in the catheter is collected in the cylinder on one side. Next, the other piston is pulled to draw blood from the blood vessel into the cylinder on the other side. At this time, pull the piston until it catches on the stopper. When returning the first blood sample to the body, the first used piston is pushed to return the blood into the blood vessel. At this time, since the stopper of the other piston is fully drawn, blood mixed with replacement fluid does not enter. After that, the blood sampling device may be pulled out from the blood sampling port, and the collected blood may be tested.

[0009]

[Function] The fluid passages communicating with the two cylinders are individually opened to the small-diameter insertion ports. By using this blood collection device, replacement fluid etc. can be collected without removing the device from the blood collection port of the catheter. It is possible to continuously collect mixed blood and blood in blood vessels. Therefore, it is not necessary to replace the instrument and the work is not complicated. In addition, since the once-collected instrument is not left, the instrument is not soiled and the work is completed extremely hygienically.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In FIG. 1, reference numeral 1 is a blood collecting device, and two cylindrical cylinders 2a and 2b are sealed on one side and open on the other side. Fluid ports 3a and 3b are opened on the closed sides of the cylinders 2a and 2b, respectively, and a step 4 continuous in the circumferential direction is provided near the opening side of the inner peripheral surface. Pistons 5a and 5b are slidably attached to the cylinders 2a and 2b, respectively, and a rubber portion 6 at the tip is adapted to be caught on a step 4, and the step 4 and the rubber portion 6 serve as a stopper. It is configured. The cylinder 2 and the piston 5 as described above are made of synthetic resin or glass,
The material is not limited.

In the figure, 7 is a fluid passage attachment, which has a small-diameter insertion port 8 at its tip, and one end of which is connected to a cylindrical mounting port 9 located at the left and right, respectively.
Fluid path 10a whose other end opens into the small-diameter insertion port 8
・ 10b is formed. This fluid path attachment 7
The fluid ports 3a and 3b of the cylinders 2a and 2b are respectively inserted into the mounting ports 9a and 9b of the above. That is, the fluid passages 10a and 10b opened to the insertion port 8 communicate with the inner space of the cylinders 2a and 2b from the attachment ports 9a and 9b at the other end through the fluid ports 3a and 3b of the cylinders 2a and 2b.

The insertion port 8 of the blood collecting device 1 as described above
Is inserted into the blood sampling port 12 of the catheter 11. The three-way stopcock 13 is turned so that the blood sampling port 12 and the blood vessel are in communication with each other.
First, the piston 5a of the cylinder 2a on one side is pulled to collect the blood 14a mixed with the replacement fluid in the catheter 11. At this time, pull the piston 5a as far as it will go,
Pull a until it is restricted by the stopper. (FIG. 3) Then, the piston 5b of the other cylinder 2b is pulled as it is, and the blood 14b from the blood vessel with no mixture is collected. (FIG. 4) Then, the piston 5a pulled first is pushed to return the blood 14a into the catheter 11. At this time, the piston 5b of the other cylinder 2b is further restricted in movement by the stopper, so that the blood 14a pushed back to the catheter 11 does not enter the cylinder 2b. (Fig. 5)

FIG. 6 shows another embodiment of the blood collecting device 1, in which the cylinders 2a and 2b are integrally formed.
An insertion port 8 is also integrally formed at the tip of the cylinders 2a and 2b. Of the cylinders 2a and 2b, one of the cylinders 2b has a small internal space. This is because the internal space has a difference according to the actual situation in which a large amount of blood to be tested is not actually required. The method of use is as described above.

[0014]

Since the present invention has the above-mentioned structure, the following effects can be obtained. Since the fluid passages that communicate with the two cylinders are individually opened to one insertion port, insert this into the blood collection port of the catheter to continuously collect blood mixed with replacement fluid and blood from the blood vessel. Therefore, blood collection work is not complicated, and smooth work can be performed. There is no need to remove the blood collection device once during blood collection, there is no need to leave the blood collection device, there is no concern that the device will become dirty or bacteria in the air will adhere, and there is no worry of sending bacteria etc. into the body when returning blood , Very hygienic work can be done.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a blood collecting method according to the present invention.

FIG. 2 is a cross-sectional view of an embodiment of a blood collecting device according to the present invention.

FIG. 3 is an explanatory diagram showing a state of collecting blood in the catheter.

FIG. 4 is an explanatory diagram of a state of collecting blood from a blood vessel.

FIG. 5 is an explanatory diagram of a state of returning blood.

FIG. 6 is a perspective view of another embodiment of the blood collecting device.

FIG. 7 is an explanatory diagram showing a state in which a replacement fluid is being sent to the catheter.

FIG. 8 is an explanatory diagram of a conventional blood collection operation from the inside of a catheter.

FIG. 9 is an explanatory diagram of a conventional blood collection operation from a blood vessel.

FIG. 10 is an explanatory diagram of a conventional work for returning blood.

[Explanation of symbols]

 1 Blood Collection Device 2 Cylinder 3 Fluid Port 4 Step 5 Piston 6 Rubber Part 7 Attachment 8 Insertion Port 9 Attachment Port 10 Fluid Path 11 Catheter 12 Blood Collection Port 13 Three-way Stopcock 14 Blood

Claims (2)

[Claims] 1. A piston is slidably mounted on each of two cylindrical cylinders, one end of which is closed and the other end of which is open. A blood collection device having a fluid path that communicates with the other end and has the other end open to a small-diameter insertion part.
Insert the insertion portion into the blood collecting port of the catheter, pull the piston of one cylinder to collect blood in the catheter, and then pull the piston of the other cylinder to collect blood again. Blood collection method. 2. A piston is slidably mounted on each of two cylindrical cylinders, one end of which is closed and the other end of which is open, and the cylinder and the piston are slid above a certain level. Is provided with a stopper that limits the above, and one end communicates with the inside space of the cylinder from the sealed front end side, and the other end has a fluid path that opens separately to the small-diameter insertion part. Characteristic blood collection device.