JPH046739Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Industrial Application Field> The present invention relates to a blood sampler for measuring the specific gravity of a donor's blood before blood collection. The present invention relates to a blood sampler for measuring blood specific gravity that can collect and dispense blood. <Prior art> Conventionally, a simple blood sampler consisting of a polyvinyl chloride hollow tube with a syringe needle connected to one end and a sponge filled at the other end has been used as a blood sampler for measuring the specific gravity of blood. . <Problems that the invention aims to solve> However, since this blood sampler has a structure in which the rear of the hollow tube is filled with a sponge, the collected blood may leak from the sponge, contaminating the surrounding area and potentially causing infection. It was expensive. Furthermore, the blood filled up to the rear end of the blood collection tube, making it impossible to dispense by pressing the rear open end of the blood collection tube with a finger. For this reason, the blood collection tube used to collect blood had to be left lying on its side, and only when dispensing, the blood collection tube had to be stood up to dispense the blood, making adjustment difficult. In addition, since this blood collection tube cannot perform suction blood collection, it is difficult to collect blood when blood pressure or blood flow is low, or when blood vessels constrict due to low temperature. Furthermore, this blood collection tube has been used to forcibly drain the blood by pressing a hollow tube made of polyvinyl chloride, but this takes a long time to drain and the blood cannot be completely drained, so the blood and blood collection tube are separated. It had the disadvantage of being unsanitary as it could not be disposed of. <Purpose> The purpose of the present invention is to provide a blood sampler that improves the drawbacks of the conventional blood sampler for measuring blood specific gravity as described above. In other words, the purpose is to provide a blood sampler that can collect blood almost quantitatively without leaking blood from the blood sampler when blood is collected, and that can also dispense blood almost quantitatively with simple operations. I have to. <Means for solving the problems> As a result of various studies in order to solve the problems of these conventional products, the inventors of the present invention have developed a hydrophobic tube near the other end of a hollow plastic tube with a syringe needle connected to one end. By using a blood sampler equipped with a sex filter,
We discovered that the problems of conventional products could be resolved and came up with the present invention. That is, the present invention comprises a hollow plastic tube with an inner diameter of 1 to 20 mm, a syringe needle fluid-tightly connected to one end of the hollow tube, and a position at least 2 mm from the other end of the hollow tube. This is a blood sampler for measuring blood specific gravity, which is made of a sintered body made of hydrophobic resin or a membrane-like filter that does not deform under small pressure. Further, in the present invention, it is preferable that a syringe connecting means is provided between the other open end of the hollow tube and a sintered body or membrane-like filter made of hydrophobic resin. <Function> The feature of the blood sampler of the present invention is that a hydrophobic filter is provided near the other end of the plastic hollow tube to which the injection needle is connected. When the syringe needle of this blood sampler is inserted into the human body, blood enters the hollow tube of the blood sampler due to the venous pressure of the human body, but a hydrophobic filter is installed near the other end of the hollow tube. Therefore, blood rises inside the hollow tube while expelling the air contained in the hollow tube and fills up to the hydrophobic filter, but the blood is blocked by the hydrophobic filter and It does not rise to the other end of the empty tube. After blood collection, the other end of the opening of the hollow tube is sealed with a finger, and the blood is dispensed by opening and closing the sealed finger.In the blood sampler, the distance between the other end of the opening and the hydrophobic filter is at least 2 mm. If it is kept separate, it is safe because people's fingers do not come into direct contact with the hydrophobic filter. Furthermore, if a syringe connecting means is provided between the other open end of the hollow tube and the hydrophobic filter, quantitative blood collection and dispensing using a syringe is possible. <Example> The blood sampler for blood specific gravity measurement of the present invention will be described below based on the drawings. FIG. 1 is a plan view of one embodiment of the blood sampler for measuring blood specific gravity of the present invention, and FIG. 2 is a cross-sectional view of another embodiment in which the vicinity of the other end of the hollow tube in FIG. 1 is enlarged. FIG. 3 is a diagram showing a syringe connected to the blood sampler of FIG. 2. In Fig. 1, 1 is a plastic hollow tube;
Reference numeral 2 indicates an injection needle connected to one end of the hollow tube, and reference numeral 3 indicates a hydrophobic filter provided near the other end of the hollow tube. The hollow tube 1 is made of plastic such as polyvinyl chloride, polyethylene, polypropylene, or ethylene-propylene copolymer, and preferably has an inner diameter of 1 to 20 mm. If the inner diameter is less than 1 mm, the blood filled in the hollow tube may not be able to be discharged due to capillary action, and if the inner diameter exceeds 20 mm, when the injection needle 2 is inserted into the human body, the blood may flow due to the venous pressure of the human body. This makes it difficult for the inside of the hollow tube to be filled. The hydrophobic filter 3 is a layered filter made of a sintered body of a hydrophobic resin such as polytetrafluoroethylene, polyhexafluoroethylene, polyethylene, polypropylene, cellulose, etc., a so-called depth type filter or a membrane filter. Close the hollow tube 1 at a position at least 2 mm, preferably 3 mm to 10 mm inside the open end of the hollow tube 1 so that the blood filled in the hollow tube 1 does not leak to the other open end of the hollow tube. It is set up so that When the syringe needle 2 is inserted into a human body in the blood sampler of the present invention, blood rises inside the hollow tube 1 due to the venous pressure of the human body and is filled up to the hydrophobic filter 3.
The collected blood is held by sealing the other end of the opening of the hollow tube 1 with a finger, and while air is introduced by opening and closing the sealed finger, the blood collected from the syringe needle 2 is stored in a specific gravity solution for comparison. Dispense into test tubes and use to measure blood specific gravity. <Test Example 1> After filling the blood collection tube of the present invention (capacity 2 ml) shown in Figure 1 with blood, place the other end of the blood collection tube with the open side facing down and check whether there is any blood leakage from the hydrophobic filter. When tests were conducted, there was no blood leakage in 10 tests. In contrast, conventional blood collection tubes for measuring blood specific gravity, which are made by filling a hollow tube with a sponge,
Blood leaked in all cases in a similar blood leakage test. FIG. 2 is an enlarged cross-section of the vicinity of the hydrophobic filter 3 of a blood sampler for blood specific gravity measurement in which a connector 4 as a syringe connection means is provided between the other open end of the hollow tube 1 and the hydrophobic filter 3 in FIG. 1. It is a diagram. The connector 4 may have a tapered inner diameter that matches the nozzle of the syringe, or a tube made of flexible resin such as soft polyvinyl chloride or polyethylene; tapered connectors may be made of hard plastic. Preferably. <Test Example 2> FIG. 3 is an enlarged cross-sectional view of the vicinity of the hydrophobic filter 3 of the blood sampler for blood specific gravity measurement of the present invention in which a syringe is attached to the connector 4 in an embodiment using the blood sampler of the present invention. The other end of the invented blood sampler with a capacity of 2ml has a capacity of 5ml.
A syringe was attached, blood was collected from the beaker through the injection needle 2, and the amount of blood collected was quantitatively determined and a blood leakage test was performed on the hydrophobic filter. Quantitative Test of Blood Collected Amount The injection needle 2 is dipped into the blood in the beaker, 1 ml of blood is collected using the scale of the syringe, and the collected blood volume is measured. Blood leakage test for hydrophobic filter Hydrophobicity when syringe needle 2 is immersed in blood in a beaker, blood is collected up to the maximum volume of 2 ml from the blood collection tube using the scale on the syringe, and then aspirated to 5 ml using the scale on the syringe The filter was checked for blood leakage. The results of these tests are shown in Table 1.

【table】

[Table] As is clear from Table 1, by attaching a syringe to the blood sampler of the present invention, blood can be collected almost quantitatively. Furthermore, it has been revealed that the hydrophobic filter of the blood sampler of the present invention does not leak blood even when blood is forcibly collected using a syringe. <Effects> The blood sampler for blood specific gravity measurement of the present invention completely blocks blood from the blood by the hydrophobic filter, so when blood is collected, blood does not leak from the other end of the blood sampler's opening, and a nearly constant amount of blood can be collected. Blood can be drawn at any time. Furthermore, since the hydrophobic filter is located away from the open end of the hollow tube, any desired amount of blood can be dispensed by simply opening and closing the sealed finger when dispensing the collected blood. Furthermore, by attaching a syringe to the blood sampler of this invention, blood can be collected almost quantitatively.
It can also be dispensed quantitatively.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, and FIG. 2 is an enlarged sectional view of another embodiment of the hollow tube in the vicinity of the other end of FIG. FIG. 3 is a diagram showing a syringe connected to the blood sampler of FIG. 2. Explanation of main symbols: 1...Hollow tube, 2...Syringe needle, 3...Hydrophobic filter, 4...Connector, 5...Piston.

Claims (1)

[Scope of claim for utility model registration] (1) A hollow plastic tube with an inner diameter of 1 to 20 mm,
A syringe needle fluid-tightly connected to one end of the hollow tube, and a sintered body made of a hydrophobic resin that does not deform under small pressure and installed at least 2 mm from the other end of the hollow tube. A blood sampler for blood specific gravity measurement consisting of a membrane filter. (2) Blood specific gravity measurement as set forth in claim 1 of the utility model registration claim, wherein a syringe connecting means is provided between the other open end of the hollow tube and a sintered body or membrane filter made of hydrophobic resin. blood sampler.