JP6999108B2 - Blood collection device and blood collection kit - Google Patents

Description

The present invention relates to a blood collection device used for blood collection. In particular, it relates to a blood collection device that enables blood to be sequentially collected in a plurality of syringes. The present invention also relates to a blood collection kit including such a blood collection device.

In order to perform a blood gas test and other general blood tests such as blood cell tests and biochemical tests, blood for each test may be collected from an artery in a separate syringe. In the field of emergency medical care, it is necessary to collect blood immediately, and blood collection for blood gas test is particularly urgent. Since heparin is applied to the syringe for collecting blood for blood gas test (hereinafter referred to as "blood gas syringe") to prevent blood coagulation, the blood collected in the blood gas syringe is the blood for general blood test. If it flows into a syringe for collecting blood (hereinafter referred to as "general-purpose syringe"), it adversely affects the results of general blood tests.

In order to collect blood for the above two tests, the following blood collection method using a general three-way stopcock (see, for example, Patent Document 1) is known.

That is, a metal needle, a blood gas syringe, and a general-purpose syringe are connected to the three connection ports arranged in a "T" shape of the three-way stopcock. Operate the lever of the three-way stopcock to communicate the metal needle and the blood gas syringe. In this state, a metal needle is punctured into the patient's artery and blood is collected in a blood gas syringe. Next, the lever of the three-way stopcock is operated to communicate the metal needle and the general-purpose syringe. Remove the blood gas syringe from the three-way stopcock and use it for blood gas testing. Then, blood is collected in a general-purpose syringe. Then the metal needle is pulled out of the artery. Separate the general syringe from the three-way stopcock and use it for a general blood test.

Japanese Unexamined Patent Publication No. 2000-350787 Japanese Unexamined Patent Publication No. 11-197254 Japanese Unexamined Patent Publication No. 2013-252165

In the blood sampling method using the above-mentioned three-way stopcock, it is necessary to operate the lever of the three-way stopcock with the metal needle punctured into the artery and to remove the blood gas syringe from the three-way stopcock. When operating the lever or removing the blood gas syringe, the metal needle may accidentally move and the metal needle may come off the artery. In this case, there is a problem that it becomes impossible to continuously collect blood in a general-purpose syringe. In addition, it takes time to operate the lever and remove the syringe for blood gas, and there is a problem that quick blood collection cannot be performed.

A first object of the present invention is to rapidly collect blood in a plurality of syringes in sequence. A second object of the present invention is to reduce the possibility that the metal needle comes off the blood vessel during blood collection.

The blood collection device of the present invention is flexible to connect a first connection port , a branch pipe provided with a first opening, a second connection port, and a third connection port, and the first connection port and the first opening. Equipped with a tube. The first connection port communicates with the third connection port via a first flow path composed of the tube and a flow path in the branch pipe. The second connection port is communicated with the third connection port via a second flow path formed by the flow path in the branch pipe. The first connection port or the first flow path can be opened and closed. The branch pipe is made of a hard material so that the central axis of the second connection port and the central axis of the third connection port are maintained in parallel. The first connection port is displaceable with respect to the third connection port. The first connection port is configured so that the tip of the cylinder of the first syringe can be detachably connected. The second connection port is configured so that the tip of the second syringe can be detachably connected. The third connection port is configured so that the needle base of a metal needle can be connected.

The blood collection kit of the present invention includes the blood collection device, a first syringe detachably connected to the first connection port, a second syringe detachably connected to the second connection port, and the third connection. Equipped with a metal needle connected to the mouth.

According to the present invention, a metal needle can be punctured into a patient to sequentially collect blood in the first and second syringes.

Since the first connection port or the first flow path can be opened and closed, the first flow path and the second flow path can be switched without using a three-way stopcock. For this reason, the problem of the conventional blood sampling method using a three-way stopcock, in which the metal needle accidentally moves when the lever of the three-way stopcock is operated and the metal needle is disengaged from the artery, is solved. In addition, since a three-way stopcock is not required, blood can be collected quickly.

The first connection port is displaceable with respect to the third connection port. Therefore, when a blood gas syringe and a general-purpose syringe are connected to the first connection port and the second connection port, respectively, even if the blood gas syringe is separated from the first connection port before blood is collected in the general-purpose syringe, the blood gas syringe may be separated. The metal needle does not come off the blood vessel. In addition, since the position and posture of the blood gas syringe can be freely changed during blood collection, the hydrophobic filter built into the blood gas syringe is wetted with blood before the blood gas syringe is completely filled with blood. The possibility of erroneous operation such as spilling is reduced.

FIG. 1 is a perspective view of the blood collection device according to the first embodiment of the present invention. FIG. 2 is a side view of a blood collection kit including the blood collection device according to the first embodiment of the present invention. FIG. 3A is a side view of a blood collection kit including the blood collection device according to the second embodiment of the present invention. FIG. 3B is a cross-sectional view of a main part of a valve unit provided in the blood collection device according to the second embodiment of the present invention.

In the blood collection device of the present invention described above, the first connection port and the second connection port may be configured so that the tip of the syringe can be detachably connected. Further, the third connection port may be configured so that a metal needle can be connected to the third connection port. According to such a configuration, the syringe and the metal needle can be directly connected to the blood sampling device of the present invention without using yet another member.

The first connection port may be a female connector provided with a self-closing valve body. In this case, the first connection port may be configured so that the valve body is immediately closed when the male member is separated from the first connection port. According to such a configuration, the first connection port can be opened and closed in conjunction with the connection / separation of the male member (for example, the tube tip of the blood gas syringe) to the first connection port. Since the configuration does not require a separate member for opening and closing the first connection port and a separate member for opening and closing the first flow path, the configuration of the blood device is simplified and the blood collection operation is easy. It is advantageous for speeding up and speeding up.

The first connection port may be configured so that the male member is maintained in a state of being connected to the first connection port by frictionally fitting the male member. According to such a configuration, the operation of connecting / disconnecting the male member (for example, the tip of the blood gas syringe) to the first connection port becomes easy. In particular, the male member can be easily separated from the first connection port with one hand. This configuration is advantageous for promptly collecting blood for a blood gas test when a syringe for blood gas is connected to the first connection port.

The central axis of the third connection port may be parallel to the central axis of the second connection port. According to such a configuration, the puncturing operation of the metal needle can be easily performed without discomfort, as in the case where the metal needle is directly connected to the cylinder tip of the second syringe. From this point of view, more preferably, the third connection port is arranged coaxially with the second connection port.

A member made of a easily deformable material may be interposed between the first connection port and the third connection port. Such a configuration is advantageous for making the first connection port displaceable with respect to the third connection port.

The blood collection device of the present invention may further include a branch tube provided with the second connection port and the third connection port, and a flexible tube connecting the branch tube and the first connection port. In this case, preferably, the first flow path is provided in the branch pipe and the tube, and the second flow path is provided in the branch pipe. According to such a configuration, the blood collection device of the present invention can be realized with a simple configuration.

The blood collection device of the present invention may further include a one-way valve provided in a portion of the first flow path unique to the first flow path that is not common to the second flow path. In this case, the one-way valve is configured to allow blood to flow from the third connection port toward the first connection port and prevent blood from flowing in the opposite direction. May be good. According to such a configuration, after the blood gas syringe is filled with blood through the first flow path, the blood in the blood gas syringe can be discharged to the second connection port without removing the blood gas syringe from the blood collection device. It can be prevented from flowing into a general-purpose syringe connected to.

In the above-mentioned blood collection kit of the present invention, the first syringe may have a smaller blood inflow resistance than the second syringe. According to such a configuration, blood can be collected in the first syringe before the second syringe without using a member for switching the flow path such as a three-way stopcock. This is advantageous for easily and quickly collecting blood into the first syringe.

Hereinafter, the present invention will be described in detail with reference to suitable embodiments. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, each figure referred to in the following description is a simplified representation of the main members constituting the embodiment of the present invention. Therefore, the present invention may include any member not shown in each of the following figures. Further, within the scope of the present invention, each member shown in each of the following figures may be changed or omitted. In the drawings cited in the description of each embodiment, the members corresponding to the members shown in the drawings cited in the preceding embodiments are designated by the same reference numerals as those given in the drawings of the preceding embodiments. be. Overlapping description of such members has been omitted, and description of the preceding embodiments should be taken into account as appropriate.

1. 1. Embodiment 1
1.1. Configuration of Blood Collection Device FIG. 1 is a perspective view of the blood collection device 1 according to the first embodiment of the present invention. The blood collection device 1 includes a first connection port 11, a second connection port 12, and a third connection port 13.

The first connection port 11 is a female connector provided with a self-closing valve body 11a. The valve body 11a is a circular thin plate made of a soft material having rubber elasticity (for example, a rubber material such as isoprene rubber, silicone rubber, butyl rubber, etc., a thermoplastic elastomer, etc.), and the valve body 11a is in the center thereof. A slit 11b is formed so as to penetrate in the thickness direction. The valve body 11a is covered with a cap 11c. A circular opening (through hole) 11d is provided in the center of the top plate of the cap 11c, and the central region of the valve body 11a including the slit 11b is exposed to the outside world through the opening 11d. When a tubular male member having no sharp tip (for example, the tip of a syringe) is pushed toward the slit 11b of the valve body 11a, the male member deforms the valve body 11a to open the slit 11b and penetrates the slit 11b. be able to. As a result, the first connection port 11 and the male member communicate with each other. After that, when the male member is pulled out from the valve body 11a, the valve body 11a immediately elastically returns to the initial state, and the slit 11b is closed. When the male member does not penetrate the slit 11b, the slit 11b is closed in a liquid-tight and airtight manner, so that blood does not leak to the outside through the slit 11b. The male member can be repeatedly inserted and removed from the valve body 11a of the first connection port 11 as many times as necessary. A female connector having such a resealing property is also called "Septum" and is generally known (see, for example, Patent Documents 2 and 3).

The end of the first connection port 11 opposite to the valve body 11a is connected to the first opening 15a of the branch pipe 15 via a flexible tube 14. The second connection port 12 and the third connection port 13 are integrally provided in the branch pipe 15.

The second connection port 12 has a hollow tubular inner peripheral surface. The inner peripheral surface of the second connection port 12 is a tapered surface (so-called female tapered surface) whose inner diameter increases as it approaches the opening end. For example, it may be a 6/100 tapered surface conforming to ISO594-1.

The third connection port 13 is a rod-shaped male member. The outer peripheral surface of the third connection port 13 is a tapered surface (so-called male tapered surface) whose outer diameter decreases as it approaches its tip. For example, it may be a 6/100 tapered surface conforming to ISO594-1. The central axis of the third connection port 13 is parallel to the central axis of the second connection port 12.

The third connection port 13 is provided with a flow path (not shown) along the central axis thereof. The flow path provided in the third connection port is a first opening into which the tube 14 is inserted via a branch flow path (not shown) branched in a substantially “Y” shape provided in the branch pipe 15. It communicates with 15a and the second connection port 12. That is, the first connection port 11 communicates with the third connection port 13 via the first flow path composed of the tube 14 and the flow path in the branch pipe 15. Further, the second connection port 12 communicates with the third connection port 13 via the second flow path formed by the flow path in the branch pipe 15. The first connection port 11 and the second connection port 12 are communicated with each other via a flow path in the tube 14 and the branch pipe 15.

The material of the branch pipe 15 is not limited, but is preferably a hard material (hard material) having mechanical strength (rigidity) to such an extent that it is not substantially deformed by an external force. For example, resin materials such as polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), rigid polyvinyl chloride, polyacetal (POM), polystyrene, polyamide, polyethylene, polypropylene (PP) can be used, among others. Polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), and rigid polyvinyl chloride are preferred. The branch pipe 15 can be integrally manufactured as a single component by an injection molding method or the like using the above resin material.

The tube 14 is flexible and preferably transparent or translucent. The material of the tube 14 is not particularly limited, but for example, a resin can be used, and specific examples thereof include soft polyvinyl chloride, polybutadiene, and polyethylene.

1.2. How to use the blood collection device The method of using the blood collection device 1 will be described.

First, as shown in FIG. 2, a first syringe 21, a second syringe 22, and a metal needle 23 are connected to the blood collection device 1 to prepare a blood collection kit 6.

The first syringe 21 is connected to the first connection port 11. The first syringe 21 is a syringe for collecting blood for blood gas test (hereinafter referred to as “blood gas syringe”). As the blood gas syringe 21, any blood gas syringe used for collecting blood for a blood gas test can be used. The blood gas syringe 21 includes a tubular outer cylinder 21a and a plunger 21c that is removably inserted into the outer cylinder 21a, similarly to a general syringe. A scale (not shown) indicating the amount of blood collected is provided on the outer peripheral surface of the outer cylinder 21a. The cylinder tip 21b provided at the tip of the outer cylinder 21a is inserted into the slit 11b (see FIG. 1) of the valve body 11a of the first connection port 11. The outer peripheral surface of the cylinder tip 21b is a tapered surface (so-called male tapered surface) whose outer diameter decreases as it approaches the tip. The outer peripheral surface of the cylinder tip 21b is fitted to the end edge of the opening 11d (see FIG. 1) of the cap 11c of the first connection port 11, and a frictional force is generated between the cylinder tip 21b and the end edge of the opening 11d. By frictionally fitting the cylinder tip 21b to the edge of the opening 11d in this way, the state in which the cylinder tip 21b is connected to the first connection port 11 is maintained. The blood gas syringe 21 does not separate from the first connection port 11 due to slight vibration or the like. Although not shown, an opening is provided in the gasket provided at the tip of the plunger 21c, and a hydrophobic filter is provided in the opening. The hydrophobic filter has a property of allowing gas to pass through but not liquid (blood in the first embodiment). The space sealed by the gasket in the outer cylinder 21a and the outside world are communicated with each other through a hydrophobic filter.

The second syringe 22 is connected to the second connection port 12. The second syringe is a syringe (hereinafter referred to as "general syringe") 22 for collecting blood for general blood tests such as blood cell tests and biochemical tests. The general-purpose syringe 22 also includes a tubular outer cylinder 22a and a plunger 22c that is removably inserted into the outer cylinder 22a. A cylinder tip 22b provided at the tip of the outer cylinder 22a is inserted into the second connection port 12 (see FIG. 1). The outer peripheral surface of the cylinder tip 22b is a tapered surface (so-called male tapered surface) whose outer diameter decreases as it approaches the tip, and the taper angle and diameter thereof are the same as the female tapered surface provided on the inner peripheral surface of the second connection port 12. Match. Therefore, the cylinder tip 22b of the general-purpose syringe 22 fits tightly into the second connection port 12. The general-purpose syringe 22 is not provided with the hydrophobic filter included in the blood gas syringe 21.

The metal needle 23 is connected to the third connection port 13. Specifically, the third connection port 13 is fitted into the resin needle base 23b provided at the base end portion of the metal needle 23. The metal needle 23 has a sharp tip 23a.

Thus, the metal needle 23 and the blood gas syringe 21 are communicated with each other via the tube 14 and the branch tube 15. Further, the metal needle 23 and the general syringe 22 are communicated with each other via the branch pipe 15. As described above, the branch pipe 15 is made of a hard material, and the central axis of the second connection port 12 and the central axis of the third connection port 13 are parallel to each other. Therefore, the longitudinal direction of the general-purpose syringe 22 and the longitudinal direction of the metal needle 23 are parallel, and the relative positions of the two are unchanged. On the other hand, since the tube 14 is easily deformable, the blood gas syringe 21 and the first connection port 11 can be freely displaced with respect to the general-purpose syringe 22, the branch tube 15, and the metal needle 23. In the present invention, "displacement" means a motion involving one or both translational motion and rotational motion.

Next, the plunger 21c of the blood gas syringe 21 is pushed into the outer cylinder 21a to the deepest part, and then pulled back until the tip of the gasket coincides with the position of the scale of the required blood collection amount. The plunger 22c of the general syringe 22 is pushed into the outer cylinder 22a to the deepest part.

In this state, the metal needle 23 is punctured into the patient's artery. The puncture can be performed, for example, by grasping the general-purpose syringe 22. Blood flows into the bifurcation tube 15 through the metal needle 23 due to arterial pressure. As the blood flows into the blood collection device 1, the air existing in the blood collection device 1 is discharged to the outside through a hydrophobic filter provided in the gasket of the blood gas syringe 21. Since the flow resistance of the air passing through the hydrophobic filter is relatively small, the blood flowing into the branch tube 15 preferentially flows to the blood gas syringe 21 through the tube 14 instead of the general syringe 22. The preset space in the blood gas syringe 21 is filled with blood. If necessary, the posture (tilt) of the blood gas syringe 21 during blood collection so that the hydrophobic filter does not get wet with blood before the air in the space inside the blood gas syringe 21 is completely replaced by blood. To adjust. For example, one hand can hold the general-purpose syringe 22 while the other hand holds the blood gas syringe 21 in a predetermined posture.

When blood is stored in the blood gas syringe 21 and the hydrophobic filter gets wet with blood, the inflow of blood into the metal needle 23 is stopped. The inflow state of blood into the blood gas syringe 21 and the wet state of the hydrophobic filter with blood can be visually recognized via the outer cylinder 21a. After confirming that the blood gas syringe 21 is filled with blood, the operator removes the blood gas syringe 21 from the first connection port 11. For example, while grasping the first connection port 11 with four fingers excluding the thumb of one hand and the palm of the hand, the end of the outer cylinder 21a on the tip end side (cylinder tip 21b side) of the outer cylinder 21a with the thumb of the hand. Push out the edge. Since the cylinder tip 21b is simply frictionally fitted to the end edge of the opening 11d (see FIG. 1) of the cap 11c of the first connection port 11, if the outer cylinder 21a is pushed out, the blood gas syringe 21 can be obtained. It can be easily separated from the first connection port 11. As described above, the first connection port 11 includes a self-closing valve body 11a. When the cylinder tip 21b comes out of the slit 11b of the valve body 11a, the slit 11b is closed immediately. Therefore, blood does not leak from the slit 11b. Further, since the hydrophobic filter 23 of the blood gas syringe 21 is wet with blood, the outside air does not flow into the blood gas syringe 21 through the hydrophobic filter. Therefore, after the cylinder tip 21b has escaped from the first connection port 11, the blood stored in the blood gas syringe 21 does not leak from the cylinder tip 21b. The blood in the separated blood gas syringe 21 is immediately subjected to a blood gas test.

Next, with the metal needle 23 punctured into the artery, the plunger 22c of the general-purpose syringe 22 is pulled to allow a predetermined amount of blood to flow into the general-purpose syringe 22.

Then, the metal needle 23 is pulled out from the patient. The general syringe 22 is separated from the second connection port 12. The blood in the general syringe 22 is used for a blood cell test, a biochemical test, and the like.

1.3. Action As described above, the blood sampling device 1 of the first embodiment has a first flow path that communicates the first connection port 11 and the third connection port 13, and the second connection port 12 and the third connection port 13. It is provided with a second flow path for communication. The first and second connection ports 11 and 12 are configured to be able to connect syringes 21 and 22, respectively, and the third connection port 13 is configured to be able to connect a metal needle 23. .. Therefore, the metal needle 23 can be punctured into the patient and blood can be sequentially collected in the two syringes 21 and 22. For example, the first syringe 21 connected to the first connection port 11 may be a blood gas syringe, and the second syringe 22 connected to the second connection port 12 may be a general-purpose syringe.

Since the first connection port 11 is connected to the branch pipe 15 via the flexible tube 14, the first connection port 11 can be freely displaced with respect to the third connection port 13. That is, the positions and postures (tilts) of the first connection port 11 and the third connection port 13 are such that changes in one position or posture (tilt) do not affect the other position or posture (tilt). ) Are independent of each other.

Therefore, even if the posture of the blood gas syringe 21 connected to the first connection port 11 is adjusted with the metal needle 23 connected to the third connection port 13 punctured by the patient, the blood gas syringe 21 The change in posture does not affect the position or posture (tilt) of the metal needle 23. This is advantageous in reducing the possibility of erroneous operation of wetting the hydrophobic filter built in the blood gas syringe 21 with blood before the space in the blood gas syringe 21 is completely filled with blood. Is.

Further, even if the blood gas syringe 21 is separated from the first connection port 11 with the metal needle 23 punctured by the patient, the position and posture (tilt) of the third connection port 13 do not change due to the separation operation. This is advantageous for separating the blood gas syringe 21 from the blood collection device 1 after the blood collection to the blood gas syringe 21 is completed and before the blood collection to the general-purpose syringe 22 is started. Therefore, in case of emergency, the blood gas test can be performed quickly. Unlike the case of using a conventional three-way stopcock, the metal needle 23 does not come off the artery by the operation of separating the blood gas syringe 21, so that it is impossible to collect blood to the general-purpose syringe 22 thereafter. do not have.

The first connection port 11 is configured to be openable and closable. The blood flow path is switched according to the open / closed state of the first connection port 11, and the blood selectively flows through either the first flow path or the second flow path. Therefore, the blood device 1 of the first embodiment does not require a member for switching between the first flow path and the second flow path (for example, a three-way stopcock used in a conventional blood collection method).

In the conventional blood sampling method described above, it is necessary to operate the lever of the three-way stopcock with the metal needle punctured in the artery in order to switch the flow path. When operating the lever, the metal needle may accidentally move and the metal needle may come off the artery. In this case, there is a problem that blood cannot be collected in a general-purpose syringe. In addition, there is a problem that it takes time to operate the lever and it is not possible to collect blood quickly. On the other hand, in the first embodiment, since the three-way stopcock is not provided, these problems are solved. Blood can be quickly and sequentially collected in two syringes 21 and 22.

The first connection port 11 includes a self-closing valve body 11a. When the cylinder tip 21b of the blood gas syringe 21 is connected to the first connection port 11, the first connection port 11 and the blood gas syringe 21 are communicated with each other, and when the cylinder tip 21b comes out from the first connection port 11, the valve is valved. The body 11a returns to the initial state, and the first connection port 11 is automatically closed immediately. That is, the first connection port 11 opens and closes in conjunction with the connection / separation of the blood gas syringe 21 to the first connection port 11. Therefore, a separate member for opening and closing the first connection port 11 is unnecessary. Further, a separate member (for example, a clamp described later) for opening and closing the first flow path is not required. This is advantageous for simplifying the configuration of the blood device 1 and facilitating and speeding up the blood collection operation.

The tube tip 21b of the blood gas syringe 21 is frictionally fitted to the first connection port 11. Therefore, the operation of connecting / disconnecting the blood gas syringe 21 to the first connection port 11 is easy. In particular, the blood gas syringe 21 can be easily separated from the first connection port 11 with one hand. For example, when collecting blood in the blood gas syringe 21, hold the first connection port 11 and the blood gas syringe 21 with one hand, and then separate the blood gas syringe 21 from the first connection port 11 with that hand. can do. In this way, a series of operations of collecting blood into the blood gas syringe 21 and separating the blood gas syringe 21 from the first connection port 11 can be continuously performed with only the same one hand. This is advantageous for rapid blood sampling for blood gas testing.

The central axis of the third connection port 13 and the central axis of the second connection port 12 are parallel to each other. Therefore, the metal needle 23 is parallel to the general syringe 22. As a result, the operator can easily perform the puncture operation of the metal needle 23 without discomfort, as in the case where the metal needle 23 is directly connected to the cylinder tip 22b of the general syringe 22. More preferably, the third connection port 13 is arranged coaxially with the second connection port 12.

The branch pipe 15 is provided with a second connection port 12 and a third connection port 13, and the first connection port 11 is connected to the branch pipe 15 via the tube 14. This is advantageous for configuring the blood collection device of the present invention with a simple configuration.

Since the blood gas syringe 21 has a built-in hydrophobic filter, the inflow resistance of blood is smaller than that of the general syringe 22. Therefore, even when the blood collection device 1 in which the first flow path and the second flow path are always open is used as in the first embodiment, the plunger 21c of the blood gas syringe 21 is pulled to a predetermined position in advance. Immediately after the metal needle 23 is punctured into the artery, blood selectively flows into the blood gas syringe 21. That is, blood can be collected in the blood gas syringe 21 before the general syringe 22 without using a member (for example, a three-way stopcock) for switching between the first flow path and the second flow path. This is advantageous for simplifying the configuration of the blood collection device 1 and facilitating and speeding up blood collection for a blood gas test.

2. 2. Embodiment 2
FIG. 3A is a side view of a blood collection kit 7 including the blood collection device 2 according to the second embodiment of the present invention. In the second embodiment, the valve unit 30 is provided integrally with the first connection port 11. FIG. 3B is a cross-sectional view of a main part of the valve unit 30. A one-way valve 31 is provided in the valve unit 30. The one-way valve 31 allows blood to flow from the branch tube 15 through the tube 14 to the first connection port 11, but conversely, from the first connection port 11 through the tube 14 to the branch tube 15. Prevents blood from flowing to. A valve that allows fluid flow in only one direction and prevents backflow is also called a check valve or a check valve. The configuration of the one-way valve 31 is not limited as long as it has such a function. In the second embodiment, a duck bill type one-way valve is used as the one-way valve 31.

The method of using the blood collection device 2 and the blood collection unit 7 of the second embodiment is substantially the same as the method of using the blood collection device 1 and the blood collection unit 76 of the first embodiment.

In Embodiment 1 (see FIG. 2), as described above, when the metal needle 23 is punctured into the patient's artery, the blood gas syringe 21 is first filled with blood. Next, the blood gas syringe 21 is removed from the first connection port 11. Next, the plunger 22c of the general-purpose syringe 22 is pulled to allow blood to flow into the general-purpose syringe 22. In this series of operations, after the blood gas syringe 21 is filled with blood, the plunger 22c of the general-purpose syringe 22 is pulled without removing the blood gas syringe 21 from the first connection port 11, and the blood gas syringe 21 is pulled. The blood stored in the 21 may flow into the general syringe 22 through the first connection port 11, the tube 14, the branch tube 15, and the second connection port 12. At this time, if the heparin applied in the blood gas syringe 21 flows into the general syringe 22 together with the blood, it adversely affects the result of the general blood test. A similar problem may occur if the plunger 21c of the blood gas syringe 21 is accidentally pushed into the outer cylinder 21a after the blood gas syringe 21 is filled with blood.

In the second embodiment, the one-way valve 31 prevents the blood in the blood gas syringe 21 from flowing into the general syringe 22. Therefore, after filling the blood gas syringe 21 with blood, the plunger 22c of the general-purpose syringe 22 is subsequently pulled without removing the blood gas syringe 21 from the first connection port 11, and blood is poured into the general-purpose syringe 22. It can be inflowed. Further, even if the plunger 21c of the blood gas syringe 21 is accidentally pushed during blood collection, the blood once flowed into the blood gas syringe 21 does not flow out from the blood gas syringe 21.

As described above, in the second embodiment, it is not always necessary to remove the blood gas syringe 21 from the first connection port 11 before collecting blood into the general syringe 22. In this respect, there is a high degree of freedom regarding the operation of blood collection. After filling the blood gas syringe 21 with blood, the plunger 22c of the general-purpose syringe 22 is pulled without removing the blood gas syringe 21 from the first connection port 11, or the plunger 21c of the blood gas syringe 21 is pulled. Even if you press, this does not adversely affect the general blood test.

In the second embodiment, the one-way valve 31 is provided between the first connection port 11 and the tube 14, but the position of the one-way valve 31 is not limited to this. Of the first flow paths that communicate the first connection port 11 and the third connection port 13, the first flow path that is not common to the second flow path that communicates the second connection port 12 and the third connection port 13. The one-way valve 31 may be arranged in a unique portion.

The second embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the second embodiment.

3. 3. Various Changes The above embodiments 1 and 2 are merely examples. The present invention is not limited to the above embodiments 1 and 2, and can be appropriately modified.

In the above embodiments 1 and 2, in order to configure the first connection port 11 to be displaceable with respect to the third connection port 13, the first connection port 11 and the branch pipe 15 are connected via a flexible tube 14. It had been. However, the present invention is not limited to this, and any configuration can be adopted as long as the first connection port 11 is displaceable with respect to the third connection port 13. Generally, a easily deformable member (hereinafter referred to as "variable member"; in the above-described first and second embodiments, the tube 14 corresponds to this) is interposed between the first connection port 11 and the third connection port 13. Therefore, the first connection port 11 can be configured to be displaceable with respect to the third connection port 13. Where the variable member is arranged between the first connection port 11 and the third connection port 13 is arbitrary. Two or more variable members may be arranged between the first connection port 11 and the third connection port 13. For example, in the above embodiments 1 and 2, the third connection port 13 and the branch pipe 15 may be connected via a flexible tube. In this case, the first connection port 11 may be provided directly on the branch pipe 15 without going through the tube 14. The configuration of the variable member is arbitrary, and may be composed of, for example, a easily deformable material (flexible material), or a member made of a hard material such as a universal joint may be relatively displaced. It may be connected as possible. The variable member made of a flexible material is not limited to a flexible tube such as the tube 14. For example, a part or all of the branch pipe 15 may be made of a material that is easily deformed, and such a branch pipe 15 may be provided with a first connection port 11 and a third connection port 13.

The configuration of the self-closing valve body 11a included in the first connection port 11 is not limited to the above example. The first connection port 11 may include an arbitrary valve body configured to open and close the first connection port 11 in conjunction with the connection / separation between the first connection port 11 and the cylinder tip 21b of the syringe 21. .. The slit 11b may not be formed in the valve body.

In order to prevent unintentional separation between the first connection port 11 and the cylinder tip 21b of the syringe 21, the first connection port 11 and / or the cylinder tip 21b is provided with a lock mechanism for maintaining the connection state between the two. May be good. The configuration of the lock mechanism is arbitrary, but for example, a male screw provided on the outer peripheral surface of the first connection port 11 and an inner peripheral surface of a cylindrical lock ring surrounding the cylinder tip 21b (a surface facing the cylinder tip 21b). It may be a screw lock mechanism composed of a female screw provided in the above. With the cylinder tip 21b inserted into the first connection port 11, the male screw and the female screw are screwed together. In this screw lock mechanism, the lock ring may be rotatable around the cylinder tip 21b or may be fixed to the cylinder tip 21b.

Alternatively, the first connection port 11 itself may not open and close, but the first flow path that communicates the first connection port 11 and the third connection port 13 may be configured to open and close. For example, the tube 14 may be provided with any clamp that can block the flow path in the tube 14 by crushing the tube 14. In this case, the first connection port 11 does not need to be provided with the valve body 11a, and may be formed of a female tapered surface like the second connection port 12, for example.

The second connection port 12 may be freely displaceable with respect to the third connection port 13. This is achieved, for example, by connecting the second connection port 12 and the branch pipe 15 via a flexible tube, or by constructing a part or all of the branch pipe 15 with a material that can be easily deformed. can. As a result, changes in the position and posture of the general-purpose syringe 22 that may occur when the plunger 22c is operated to collect blood from the general-purpose syringe 22 do not affect the metal needle 23. The metal needle 23 is punctured by the patient while holding the metal needle 23.

The second connection port 12 may include a self-closing valve body similar to the first connection port 11. In this case, if the general-purpose syringe 22 is separated from the second connection port 12, blood can be prevented from flowing out from the second connection port 12. If both the first and second connection ports 11 and 12 are provided with a self-closing valve body, blood collection is completed and the syringes 21 and 22 are separated from the first and second connection ports 11 and 12. , It is possible to prevent blood from flowing out from any of the first and second connection ports 11 and 12 and the tip 23a of the metal needle 23. The ability to prevent the outflow of blood is advantageous in reducing the likelihood of the operator coming into contact with the blood.

The number of connection ports to which a syringe can be connected is not limited to two. The blood collection device of the present invention may be provided with three or more connection ports so that three or more syringes can be connected. Further connection ports (third connection port, fourth connection port, ...) Other than the above first and second connection ports 11 and 12 are communicated with the third connection port 13 to which the metal needle 23 is connected. Ru. The further connection port may be provided with a self-closing valve body similar to that of the first connection port 11, or may be configured with a female tapered surface similar to that of the second connection port 12. Further connection ports may be provided in the branch pipe 15 or may be connected to the branch pipe 15 via a flexible tube.

Although the above-described first and second embodiments have described a blood collection device that collects blood for a blood gas test and other blood collection for a general blood test, the present invention is not limited thereto. For example, the blood collection device of the present invention may be used to collect blood for a general blood test on two syringes 21 and 22. In this case, the first syringe 21 connected to the first connection port 11 does not have to be provided with a hydrophobic filter. The metal needle 23 may puncture a vein instead of an artery.

The present invention can be widely used in the field of collecting blood for a blood test. In particular, it can be suitably used when blood for a blood gas test and blood for other general blood tests are collected in separate syringes.

1, 2 Blood collection device 6, 7 Blood collection kit 11 1st connection port 11a Valve body 12 2nd connection port 13 3rd connection port 14 Tube 15 Branch tube 21 1st syringe (syringe for collecting blood for blood gas test)
21b Cylinder tip of 1st syringe (male member)
22 Second syringe (syringe for collecting blood for general blood test)
22b 2nd syringe tube tip 23 metal needle 31 one-way valve

Claims (6)

The first connection port and
A branch pipe provided with a first opening, a second connection port, and a third connection port,
A flexible tube connecting the first connection port and the first opening is provided.
The first connection port is communicated with the third connection port via a first flow path composed of the tube and a flow path in the branch pipe.
The second connection port is communicated with the third connection port via the second flow path formed by the flow path in the branch pipe.
The first connection port or the first flow path can be opened and closed.
The branch pipe is made of a hard material so that the central axis of the second connection port and the central axis of the third connection port are maintained in parallel.
The first connection port is displaceable with respect to the third connection port .
The first connection port is configured so that the tip of the first syringe can be detachably connected.
The second connection port is configured so that the tip of the second syringe can be detachably connected.
The third connection port is a blood collection device characterized in that it is configured so that a needle base of a metal needle can be connected . The first connection port is a female connector provided with a self-closing valve body.
The blood collection device according to claim 1 , wherein the first connection port is configured so that the valve body is immediately closed when the tube tip of the first syringe is separated from the first connection port. The blood collection device according to claim 2 , wherein the first connection port is configured such that the tube tip is frictionally fitted to maintain the state in which the tube tip is connected to the first connection port. Further, a one-way valve provided in a portion unique to the first flow path, which is not common to the second flow path, is provided in the first flow path.
Claim 1 is configured such that the one-way valve allows blood to flow from the third connection port toward the first connection port and prevents blood from flowing in the opposite direction. The blood collection device according to any one of 3 to 3 . The blood sampling device according to any one of claims 1 to 4 , the first syringe detachably connected to the first connection port, and the second detachably connected to the second connection port. A blood collection kit including a syringe and the metal needle connected to the third connection port. The blood collection kit according to claim 5 , wherein the first syringe has a smaller inflow resistance of blood than the second syringe.

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