JP2005245704A - Adapter for blood sampling needle, holder for vacuum blood sampling and blood sampling needle for vacuum blood sampling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adapter for a blood sampling needle and the blood sampling needle for vacuum blood sampling capable of surely preventing a back flow due to a pressure inside a vacuum blood sampling tube higher than the pressure inside a blood vessel at the time of vacuum blood sampling. <P>SOLUTION: The adapter 1 for the blood sampling needle to which a blood sampling needle body is attached at the time of vacuum blood sampling is provided with a communicating needle 3 inserted into the vacuum blood sampling tube and a needle fixing member 2 whose base end side is fixed with the communication needle 3, the blood sampling needle body is fixed to the other end of the needle fixing member 2, a hole 2b is formed at the center of the needle fixing member 2, and first and second flow path parts constituting the internal flow path of the needle fixing member 2 are opened at the hole 2b. By moving a valve 4 inserted into the hole 2b inside the hole 2b, a first state in which the first and second flow path parts communicate with each other and a second state in which the length of blood in the first and second flow path parts is interrupted can be taken. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a blood collection needle adapter to which a blood collection needle body used in a vacuum blood collection method is attached, a vacuum blood collection holder to which the blood collection needle adapter is attached, and a vacuum blood collection needle, and in particular, during and after blood collection The present invention relates to a blood collection needle adapter, a vacuum blood collection holder, and a vacuum blood collection needle provided with a structure for preventing the backflow of blood.

  Conventionally, vacuum blood collection tubes have been widely used for various blood tests. The vacuum blood collection tube has a bottomed cylindrical blood collection tube main body and a plug for closing the opening of the blood collection tube main body, and the inside is decompressed. It is possible to flow blood from a blood vessel or the like into the vacuum blood collection tube using the reduced pressure in the vacuum blood collection tube.

  When blood is collected from a blood vessel using a vacuum blood collection tube, a tourniquet is wound around the arm of the blood sample to increase the pressure in the blood vessel of the blood sample. The blood collection needle is inserted into the blood vessel, and the blood collection needle is then communicated with the vacuum blood collection tube. As a result, blood flows from the blood vessel toward the vacuum blood collection tube. The blood flow stops when the pressure in the vacuum blood collection tube and the pressure in the blood vessel reach parallel. Thereafter, the vacuum blood collection tube is withdrawn from the blood collection needle, and the blood collection needle is withdrawn from the blood vessel. Finally, the tourniquet is removed from the blood sample.

  However, if the tourniquet is accidentally removed from the blood collection arm before removing the vacuum blood collection tube from the blood collection needle, the pressure in the blood vessel part where the needle tip of the blood collection needle is inserted is increased in the vacuum blood collection tube. Lower than the pressure of. As a result, blood in the vacuum blood collection tube may flow to the blood vessel side of the blood sample through the blood collection needle, so-called reverse flow may occur.

  Also, the backflow as described above may occur when the position of the vacuum blood collection tube is higher than the blood vessel in which the needle tip of the blood collection needle is inserted.

  On the other hand, an anticoagulant such as heparin sodium for preventing blood coagulation and a drug such as a coagulation accelerator are often housed in the vacuum blood collection tube. Therefore, when a backflow occurs, the drug moves to the blood vessel side, which may adversely affect the blood sample.

Therefore, Patent Document 1 below discloses a blood collection needle for vacuum blood collection provided with a structure for preventing backflow. Further, Patent Document 2 below discloses a vacuum blood collection apparatus provided with a mechanism for adjusting a flow rate during blood collection.
JP-A-57-11660 JP 56-109643 A

  However, with the backflow prevention structure described in Patent Document 1, it has been difficult to completely prevent backflow.

  The configuration described in Patent Document 2 is effective when it is difficult to continue blood collection due to collapse of blood vessels during blood collection. However, in order to completely block the blood flow, it is necessary to hold the device with one hand in order to always block the blood flow. Therefore, it has been difficult to perform all the operations alone when exchanging the vacuum blood collection tubes when collecting blood in a plurality of vacuum blood collection tubes or when removing the tourniquet after blood collection.

  An object of the present invention is to more reliably prevent backflow during vacuum blood collection, and can be easily and easily operated by a blood collection person. An object of the present invention is to provide an adapter for blood collection needle, a holder for vacuum blood collection, and a blood collection needle for vacuum blood collection that enable easy operations such as removal.

  According to the present invention, in vacuum blood collection using a vacuum blood collection tube, a blood collection needle adapter to which a blood collection needle body is attached, the needle tip inserted into the vacuum blood collection tube, and an end opposite to the needle tip A blood collection needle body having a communicating needle having a proximal end, a needle tip inserted into a blood vessel, and a proximal end located at an end opposite to the needle tip is fixed on the proximal end side. A blood collection needle main body fixing portion that is enabled, and a communication needle fixing portion that fixes the communication needle on the proximal end side of the communication needle, and a base end of the blood collection needle main body and a base end of the communication needle And a needle fixing member provided therein, and a hole is formed in the middle of the blood channel inside the needle fixing member so as to intersect the blood channel. On the side surface of the blood flow channel, the first flow channel portion connected to the blood collection needle main body, and the communication needle. A valve having an internal flow path that is open to the second flow path portion, is inserted into the hole, and intersects the length direction of the hole, and the internal flow path of the valve is a side surface of the hole A first state in which the first and second flow path portions that are open to each other and a second state in which the blood flow between the first and second flow path portions is blocked can be taken. A blood collection needle adapter is provided, wherein the valve is configured to be movable in the hole.

  In a specific aspect of the blood sampling needle adapter according to the present invention, the valve is a small-diameter portion that is inserted into the hole, and an operation portion that is disposed outside the hole and has a shape larger than the small-diameter portion. Have

  In another specific aspect of the present invention, the first state in which the internal flow path communicates the first and second flow path portions, and the internal flow path is between the first and second flow path portions. The valve can be rotated in the hole so as to be able to assume a second state in which the valve is not in communication.

  In still another specific aspect of the blood sampling needle adapter according to the present invention, a female screw is formed on the inner peripheral surface of the hole, and a male screw is formed on the outer peripheral surface of the portion inserted into the hole of the valve. Yes.

  According to still another specific aspect of the blood sampling needle adapter according to the present invention, the valve is configured to be movable in the length direction of the hole in the hole, and the internal flow path is the first, The valve is configured so that a first state in which the second channel portion is communicated and a second state in which the internal channel is not in communication with the first and second channel portions. It is comprised so that it can move to the length direction of a hole within a hole.

  A vacuum blood collection holder according to the present invention has an opening at one end, a cylindrical holder body configured to insert a vacuum blood collection tube from the opening side, and the opening of the cylindrical holder body. Is mounted at the opposite end and comprises a blood collection needle adapter constructed according to the present invention.

  A blood collection needle for vacuum blood collection according to the present invention includes a blood collection needle adapter configured according to the present invention, and a blood collection needle main body having a proximal end portion fixed to a blood collection needle main body fixing portion of the blood collection needle adapter.

  In the blood sampling needle adapter according to the present invention, the communication needle is fixed to the needle fixing member, and the blood flow path that connects the communication needle and the blood sampling needle main body fixed to the needle fixing member in the needle fixing member And a hole is formed so as to intersect the blood flow path. And the 1st flow-path part and 2nd flow-path part of the blood flow path are opening in the side surface of this hole. In addition, a valve having an internal flow path that intersects the length direction of the hole is inserted into the hole, and the internal flow path of the valve is open to the side surface of the hole. The valve is configured to be movable in the hole so that the valve can take a first state in which the valve is in communication and a second state in which the valve blocks the blood flow between the first and second flow path portions. ing.

  Therefore, at the time of vacuum blood collection, the blood collection needle main body is fixed to the blood collection needle main body fixing portion of the blood collection needle adapter, the valve is moved in the hole, and the blood collection needle main body and the communication needle are communicated with each other. be able to. Therefore, the needle tip of the blood collection needle body is inserted into the blood vessel, the plug of the vacuum blood collection tube is pierced by the needle tip of the communication needle, and the tip of the communication needle is positioned in the vacuum blood collection tube, so that the blood is collected in the blood collection needle main body, It is guided into the vacuum blood collection tube through the needle fixing member and the communicating needle.

  Then, at the stage where the vacuum blood collection is completed, the valve may be moved within the hole to enter the second state. In the second state, the internal flow path of the valve does not communicate with the first and second flow path portions opened on the side surface of the hole, and the blood flow between the first and second flow path portions is not. The flow is interrupted. Therefore, even if the pressure in the vacuum blood collection tube becomes higher than the pressure in the blood vessel, the backflow of blood in the vacuum blood collection tube to the blood vessel can be reliably prevented.

  When the valve has a small diameter part inserted into the hole and an operation part that is arranged outside the hole and has a shape larger than the small diameter part, the operation part has a relatively large shape. Thus, the valve can be easily moved in the hole.

  A first state in which the internal flow path communicates with the first and second flow path portions, and a second state in which the internal flow path does not communicate between the first and second flow path portions. If the valve is configured so that it can be rotated within the hole, the first and second states can be rotated to the second and first states simply by rotating the valve around the length of the hole. Can be easily switched to.

  When a female screw is formed on the inner peripheral surface of the hole and a male screw is formed on the outer peripheral surface of the portion to be inserted into the hole of the valve, the valve is rotated in the hole to start from the first and second states. When switching to the second and first states, switching can be performed reliably. In addition, the valve can be more reliably maintained in the first state and the second state.

  The valve is configured to move in the length direction of the hole within the hole, and the internal flow path communicates between the first and second flow path portions, and the internal flow path is When the valve is configured to be movable in the length direction of the hole in the hole so that the second state where the first and second flow path portions are not in communication can be taken, the valve is It is possible to easily switch from the first state to the second state simply by moving in the length direction. In addition, switching from the second state to the first state can be easily achieved only by moving the valve in the length direction of the hole.

  In the vacuum blood collection holder according to the present invention, a cylindrical holder body having an opening at one end and configured to be inserted with a vacuum blood collection tube from the opening side, an opening of the cylindrical holder body, Is attached to the opposite end and includes a blood collection needle adapter constructed in accordance with the present invention. Therefore, vacuum blood collection can be easily performed according to a conventional method simply by inserting a vacuum blood collection tube from the opening of the holder main body and fixing the blood collection needle main body to the blood collection needle main body fixing portion of the blood collection needle adapter. In addition, since the adapter for the blood collection needle according to the present invention is provided, even if the pressure in the vacuum blood collection tube becomes higher than the pressure on the blood vessel side, the valve is operated to return to the second state. Can be reliably prevented.

  The blood collection needle for vacuum blood collection according to the present invention has a structure in which the proximal end portion of the blood collection needle body is fixed to the blood collection needle body fixing portion of the blood collection needle adapter configured according to the present invention. By inserting the tip of the tip of the vacuum blood collection tube and inserting the needle tip of the blood collection needle body into the blood vessel, vacuum blood collection can be easily performed according to a conventional method. Moreover, even if the pressure in the vacuum blood collection tube becomes higher than the pressure in the blood vessel, the backflow can be reliably prevented by operating the valve to the second state described above.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  FIG. 1 is a front view showing a blood collection needle adapter according to a first embodiment of the present invention.

  The blood collection needle adapter 1 includes a needle fixing member 2, a communication needle 3, and a valve 4.

  The needle fixing member 2 is made of an appropriate rigid material such as synthetic resin or metal. In the present embodiment, the needle fixing member 2 is made of a synthetic resin.

  On one end side of the needle fixing member 2, a communication needle fixing portion 2a is provided. The communication needle 3 is fixed to the communication needle fixing portion 2a. The communication needle 3 is made of a metal such as stainless steel, and is constituted by a hollow needle having a channel inside. The needle tip 3a of the communication needle 3 is configured to be able to pierce a stopper of a vacuum blood collection tube to be described later.

  The communication needle 3 is fixed to the needle fixing member 2 on the base end 3 b side that is the end opposite to the needle tip 3 a of the communication needle 3.

  On the other hand, a hole 2 b is formed in the center of the needle fixing member 2. The hole 2 b is configured to penetrate the needle fixing member 2 in the needle fixing member 2 in a direction orthogonal to the length direction of the communication needle 3.

  As shown in FIGS. 2A and 2B, the opening of the base end 3 b of the communication needle 3 faces the side surface of the hole 2 b. The base end 3b of the communication needle 3 only needs to communicate with the hole 2b, and the base end 3b does not necessarily reach the side surface of the hole 2b.

  In the needle fixing member 2, the flow path portion on the side of the communicating needle 3 in the hole 2b constitutes the second flow path portion 5 according to the present invention. Here, the second flow path portion 5 is a flow path portion on the side of the communication needle 3 with respect to the hole 2 b, and the flow path portion configured by the needle fixing member 2 and the needle fixing member 2 of the communication needle 3. It is used as an expression including a flow path portion constituted by a portion embedded in the wall.

  That is, when the base end 3b of the communication needle 3 reaches the side surface of the hole 2b, the second flow path portion 5 is formed by the flow path portion in the portion embedded in the needle fixing member 2 of the communication needle 3. Will be composed. On the other hand, unlike the structure shown in FIG. 2B, when the proximal end 3b of the communication needle 3 does not reach the side surface of the hole 2b, the communication needle in the portion embedded in the needle fixing member 2 of the communication needle 3 is used. The internal flow path portion and the flow path portion in the needle fixing member 2 between the proximal end of the communicating needle and the side surface of the hole 2b constitute the second flow path portion.

On the other hand, in the needle fixing member 2, a blood collection needle main body fixing portion 2c is provided on the side opposite to the portion where the communication needle 3 is fixed through the hole 2b. In the present embodiment, the blood collection needle main body fixing portion 2c is constituted by a truncated cone portion whose diameter decreases toward the tip. The blood collection needle main body fixing portion 2c preferably has a shape capable of connecting a blood collection needle main body conforming to a generally used injection needle standard. As shown in FIG. 4, the blood collection needle main body 6 is fixed to the blood collection needle main body fixing portion 2c. The blood collection needle main body 6 has a needle tip 6a to be inserted into a blood vessel and a base end 6b located at the end opposite to the needle tip 6a. The base end 6b is usually composed of a truncated cone portion made of synthetic resin. The shape and size of the blood collection needle main body fixing portion 2c described above are determined so that the frustoconical portion can be extrapolated to the blood collection needle main body fixing portion 2c of the needle fixing member 2. The outer shape of the blood collection needle main body fixing portion 2c is not particularly limited as long as the blood collection needle main body can be fixed in a liquid-tight manner.

  As shown in FIG. 2B, the first flow path portion 7 is configured so as to reach the side surface of the hole 2b from the outer end of the blood collection needle main body fixing portion 2c. The first flow path portion 7 and the second flow path portion 5 constitute a blood flow path in the needle fixing member 2 in the present invention.

  Although the first flow path portion 7 is formed by a cavity provided in the needle fixing member 2, a part or all of the first flow path portion 7 is constituted by a part of the blood collection needle body. Also good. That is, as shown in an embodiment of a blood collection needle for vacuum blood collection described later, the proximal end portion of the blood collection needle main body may be embedded in the needle fixing member 2, and in that case, embedded in the needle fixing member 2. A part or all of the first flow path portion is also constituted by the blood collection needle main body portion.

  As shown in FIGS. 1 and 2, a valve 4 is inserted into the hole 2b. In the present embodiment, the valve 4 is made of a synthetic resin, but may be made of a metal such as stainless steel.

  As shown in front and side views in FIGS. 3A and 3B, the valve 4 has a cylindrical small-diameter portion 4a having a relatively small diameter inserted into the hole 2b. At one end of the small diameter portion 4a, an operation portion 4b having a larger outer shape than the small diameter portion 4a is provided. In the present embodiment, the operation unit 4b has a rectangular planar shape. Therefore, the direction of the operation unit 4b can be easily changed by fingers. In other words, the valve 4 can be easily rotated around the length of the hole 2b.

  A locking portion 4c is provided at the other end of the small diameter portion 4a. The locking portion 4c has a truncated cone shape and is continuous with the small diameter portion 4b on the bottom surface of the truncated cone shape. The locking portion 4c is provided to prevent the valve 4 from coming out of the hole 2b. Therefore, the latching | locking part 4c is not limited to a truncated cone shape, As long as it has a planar shape larger than the hole 2b, it can be set as an appropriate shape.

  An internal flow path 4 d is provided in the small diameter portion 4 a of the valve 4. The internal flow path 4d is extended in a direction that coincides with the length direction of the communication needle 3 when in the first state described later.

  In the present embodiment, by rotating the valve 4, the length direction of the internal flow path 4d is changed. The internal flow path 4d is provided in the valve 4 so that both ends can take a first state communicating with the first and second flow path portions 7 and 5. That is, in the valve 4, the internal flow path 4d is provided so as to be located at the center in the length direction of the hole 2b. On the other hand, the 1st, 2nd flow path parts 7 and 5 are also opened in the side surface of the hole 2b in the center of the length direction of the hole 2b. Therefore, when the valve 4 is rotated and the internal flow path 4d communicates with the first flow path portion 7 and the second flow path portion 5, that is, in the first state, the first and second flow paths The portions 7 and 5 communicate with each other through the second internal flow path 4d.

In the present embodiment, the length direction of the internal flow path 4d coincides with the length direction of the operation portion 4b (see FIGS. 3A and 3B). Accordingly, the length direction of the operation portion 4b of the valve 4 is set to the communication needle 3.
When operated so as to coincide with the length direction, the valve 4 is in the first state. Therefore, the valve 4 can be easily brought into the first state by visual observation.

  On the other hand, when the valve 4 is rotated from the first state, both ends of the internal flow path 4d do not communicate with the first and second flow path portions 7 and 5. Therefore, it is possible to block between the first flow path portion and the second flow path portion. In the present embodiment, the state where the communication between the first flow path portion and the second flow path portion is blocked is the second state. Therefore, when switching from the first state to the second state, the valve 4 need only be slightly rotated from the first state.

  However, in order to reliably maintain the second state, it is necessary that the openings of the first and second flow path portions do not overlap with the end openings of the internal flow path at all. Therefore, in the present embodiment, preferably, the length direction of the operation portion 4b is orthogonal to the length direction of the communication needle 3, in other words, the direction orthogonal to the direction connecting the first and second flow path portions. It is desirable to rotate the valve 4 so that In this way, the valve 4 can be reliably brought into the second state.

  To return to the first state, as described above, the valve 4 is rotated so that the length direction of the operation portion 4b of the valve 4 coincides with the direction connecting the first and second flow path portions. Just do it.

  Therefore, when the adapter 1 for blood collection needle of the present embodiment is used, the valve 4 is rotated to easily and reliably change from the first state to the second state and from the second state to the first state. Can be switched to.

  As shown in FIG. 4, in vacuum blood collection using the blood collection needle adapter 1, first, a cylindrical holder body 11 is attached to the blood collection needle adapter 1. As the cylindrical holder body 11, an appropriate cylindrical holder having an opening 11a at one end and through which the communicating needle 3 of the blood collection needle adapter 1 is inserted from the other end 11b side can be used.

  Next, the blood collection needle main body 6 is fixed to the blood collection needle main body fixing portion 2 c of the blood collection needle adapter 1.

  Then, a tourniquet is attached to the arm of the blood sample to increase the pressure in the blood vessel. Thereafter, the needle tip 6a of the blood collection needle main body 6 is inserted into the blood vessel. With the needle tip 6a of the blood collection needle body 6 inserted into the blood vessel, the vacuum blood collection tube is inserted from the opening 11a of the holder body 11. Then, the plug of the vacuum blood collection tube is pierced by the communication needle 3. As a result, blood is guided from the blood vessel to the vacuum blood collection tube according to the degree of decompression in the vacuum blood collection tube according to a conventional method. In this case, the valve 4 in the blood collection needle adapter 1 is in the first state.

  Then, when the vacuum blood sampling is completed, the valve 4 may be rotated to be in the second state. Therefore, even if the pressure in the vacuum blood collection tube is erroneously higher than the pressure in the blood vessel, backflow can be reliably prevented.

  That is, if the valve 4 is in the second state, even if the tourniquet is removed prior to removal of the vacuum blood collection tube, backflow is reliably prevented. In addition, when blood is sequentially collected into a plurality of vacuum blood collection tubes, the valve may be set to the second state prior to the replacement of the vacuum blood collection tube. The state 1 may be used.

  Therefore, if the adapter 1 for blood collection needles of this embodiment is used, backflow can be reliably prevented and blood can be collected easily and quickly.

FIG. 5 is a front view showing a vacuum blood collection needle as another embodiment of the present invention, and FIG. 6 is a plan view of the vacuum blood collection needle of this embodiment. The blood collection needle 21 for vacuum blood collection of the present embodiment has a structure in which a blood collection needle main body 22 is further integrated with the blood collection needle adapter 1 of the first embodiment. Since the other points are the same, the same reference numerals are assigned to the same parts, and the description given in the first embodiment is incorporated.

  The blood collection needle main body 22 has a needle tip 22a and a base end 22b opposite to the needle tip 22a. The blood collection needle main body 22 is fixed to the side of the needle fixing member 2 opposite to the side on which the communication needle 3 is fixed. That is, the blood collection needle main body 22 is partially embedded in the needle fixing member 2 so as to extend in the length direction of the needle fixing member 2, and the base end 22b of the blood collection needle main body 22 is inserted through the hole 2b. It faces the base end 3 b of the communication needle 3. In the present embodiment, the base end 22b opens on the side surface of the hole 2b. Accordingly, the first flow path portion 7 is constituted by the blood flow in the blood collection needle main body in the portion where the blood collection needle main body 22 in the needle fixing member 2 is embedded. The base end 22b of the blood collection needle main body 22 does not necessarily reach the side surface of the hole 2b. In that case, the first flow path portion 7 includes a portion embedded in the needle fixing member 2 of the blood collection needle main body 22, and a portion opened to the side surface of the base end 22b and the hole 2b of the blood collection needle main body 22. It is comprised by both the flow-path parts between.

  FIGS. 7A and 7B are front views showing a blood collection needle for vacuum blood collection as a third embodiment of the present invention. FIGS. 8A and 8B are a front view and a plan view showing a structure in which the valve is removed from the vacuum blood collection needle according to the present embodiment, and FIG. 9 is a front view showing the valve.

  In the blood collection needle 31 for vacuum blood collection of the present embodiment, a hole 2e that is not a through hole is formed in the needle fixing member 2 instead of the hole 2b that is a through hole. An internal thread is formed on the inner peripheral surface of the hole 2e. Regarding other structures, the needle fixing member 2 is configured similarly to the needle fixing member 2 shown in FIG. Further, the communication needle 3 and the blood collection needle main body 22 are fixed to the needle fixing member 2 in the same manner as in the case of the blood collection needle 21 for vacuum blood collection shown in FIG. Therefore, these structures are omitted by using the description made with reference to FIGS. 1 and 5.

  The feature of this embodiment is that a female screw is formed on the inner peripheral surface of the hole 2e and a male screw is formed on the outer peripheral surface of the small diameter portion 34a of the valve 34 inserted into the hole 2e.

  That is, the valve 34 is made of metal or synthetic resin, and a male screw that meshes with the female screw of the hole 2e is formed on the outer peripheral surface of the small diameter portion 34a. And the operation part 34b is continued to the head of the small diameter part 34a. In the present embodiment, the operation unit 34b has a rectangular planar shape. But the operation part 34b may have other planar shapes, such as circular.

  In the present embodiment, as shown in FIG. 7B, the length of the small diameter portion 34a is such that the surface 34b1 on the small diameter portion 34a side of the operation portion 34b is in contact with the outer surface of the needle fixing member 2, that is, the small diameter In a state where the portion 34a is completely screwed into the hole 2e, the small diameter portion 34a is in a second state where the first and second flow path portions are blocked.

  In other words, the small diameter portion 34a has a length that can reach the opposite side of the operation portion 34b from the opening so as to close the opening facing the hole 2e of the first and second flow path portions. It only has to be.

When the vacuum blood collection needle 31 of this embodiment is used, when vacuum blood collection is performed, as shown in FIG. 7A, the small-diameter portion 34a opens the communicating needle 3 and the proximal end of the blood collection needle body 22 into the hole 2e. The state that is not closed. This state is the first state, and the first and second flow path portions are communicated, and blood can be guided from the blood collection needle body 22 to the communication needle 3 side. When the vacuum blood collection is completed, as shown in FIG. 7 (b), the valve 34 may be further screwed into the hole 2e to be in the second state. In the second state, the blood flow between the first and second flow path portions is blocked by the presence of the small diameter portion 34a.

  In order to easily confirm that the first state and the second state have been reached, in the state where the surface 34b1 on the small diameter portion 34a side of the operation portion 34b is in contact with the outer surface of the needle fixing member 2, in advance. As shown in FIG. 7B, the length of the small-diameter portion 34a may be selected so as to be in the second state. In that case, it is possible to reliably switch from the first state to the second state.

  Further, in order to easily confirm that the first state is established, it is only necessary to mark a part of the thread of the small diameter portion 34a. That is, when the mark is exposed to the outside of the needle fixing member 2, the mark is shown so as to indicate that the tip of the small diameter portion 34a has not reached the position connecting the first and second flow path portions. It should be provided. In that case, when the mark is visually confirmed, it can be easily grasped that the valve 34 is in the first state.

  FIGS. 10A and 10B are front views showing a blood collection needle for vacuum blood collection according to the fourth embodiment of the present invention, and FIG. 11 is a plan view. In addition, Fig.10 (a) is a front view of a 1st state, (b) is a front view when it exists in a 2nd state. In the blood collection needle 41 for vacuum blood collection of the present embodiment, the needle fixing member 2, the communicating needle 3, and the blood collection needle main body 22 are the same as those in the embodiment shown in FIG. The difference is that a valve 44 is used instead of the valve 4 and that the cross-sectional shape of the hole 2b is rectangular as described later.

  As shown in FIGS. 11 and 12A and 12B, the valve 44 has a prismatic small diameter portion 44a. The small diameter part 44a is made longer than the length of the hole 2b. And the flange parts 44b and 44c are provided in the both ends of the small diameter part 44a. The inner surfaces of the flange portions 44b and 44c are made larger than the opening portion of the hole 2b.

  On the other hand, the valve 44 is provided with an internal flow path 44d. The valve 44 is prevented from rotating around the length of the hole 2b. Therefore, it is preferable that the small-diameter portion 44a of the valve 44 has a rectangular cross section or an elliptical shape. In the present embodiment, the small diameter portion 44a of the valve 44 has a rectangular cross section. Therefore, the hole 2b has a rectangular cross section (see FIG. 11).

  In the vacuum blood collection needle 41, the valve 44 is in the first state in the state shown in FIG. In this case, the internal flow path 44d is in a state of communicating the first and second flow path portions. In order to switch to the second state, the valve 44 may be moved in the length direction in the hole 2b. That is, as shown in FIG. 10B, the valve 44 may be moved in the length direction of the small diameter portion 44a so that the internal flow path 44d does not communicate with the first and second flow path portions. . Accordingly, the vacuum blood collection needle 41 can also be easily switched from the first state to the second state and from the second state to the first state, thereby ensuring the backflow. Can be prevented.

  As described above, the present invention is characterized by having a backflow prevention structure using a needle fixing member and a valve. In the blood sampling needle adapter according to the present invention, the structure shown in FIG. The structure of the blood collection needle for vacuum blood collection after the second embodiment described above can be appropriately adopted. Similarly, in the vacuum blood collection holder according to the present invention, the structure of the embodiment of the vacuum blood collection needle described above is appropriately adopted as the structure of the needle fixing member and the valve combined with the cylindrical holder body. Can do.

The front view which shows the adapter for blood collection needles concerning the 1st Embodiment of this invention. (A) And (b) is a front view which shows when the adapter for blood collection needles of 1st Embodiment exists in a 2nd state, and front sectional drawing which shows the state which removed the valve from this adapter for blood collection needles. (A) And (b) is the front view and side view which show the valve | bulb used in 1st Embodiment. The schematic front view which shows the state which mounts | wears with the blood collection needle | hook main body in the holder for vacuum blood collection incorporating the adapter for blood collection needles concerning 1st Embodiment. The front view which shows the blood collection needle for vacuum blood collection as the 2nd Embodiment of this invention. The top view of the blood collection needle for vacuum blood collection shown in FIG. (A) And (b) is each front sectional drawing of the blood-collecting needle for vacuum blood collection as the 3rd Embodiment of this invention. (A) And (b) is the front view and top view which show the state which removed the valve | bulb from the blood collection needle for vacuum blood collection shown in FIG. The front view which shows the valve | bulb used for the blood collection needle for vacuum blood collection shown in FIG. (A) And (b) is each front sectional drawing for demonstrating the blood collection needle for vacuum blood collection as the 4th Embodiment of this invention. The top view which shows the blood collection needle for vacuum blood collection shown in FIG. (A) And (b) is the front view and side view which show the valve | bulb used with the blood collection needle for vacuum blood collection shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Adapter for blood collection needles 2 ... Needle fixing member 2a ... Communication needle fixing | fixed part 2b ... Hole 2c ... Blood collection needle main body fixing | fixed part 2e ... Hole 3 ... Communication needle 3a ... Needle tip 3b ... Base end 4 ... Valve 4a ... Small diameter part 4b ... Operation part 4c ... Locking part 4d ... Internal flow path 5 ... Second flow path part 6 ... Blood collection needle main body 6a ... Needle tip 6b ... Base end 7 ... First flow path part 11 ... Holder main body 11a ... Opening 11b ... the other end 21 ... the blood collection needle for vacuum blood collection 22 ... the blood collection needle main body 22a ... the needle tip 22b ... the proximal end 31 ... the blood collection needle for vacuum blood collection 34 ... the valve 34a ... the small diameter portion 34b ... the operation portion 34b1 ... the surface 44 ... the valve 44a ... the small diameter 44b, 44c ... Flange 44d ... Internal flow path

Claims (7)

When vacuum blood collection using a vacuum blood collection tube, a blood collection needle adapter to which a blood collection needle body is attached,
A communicating needle having a needle tip to be inserted into the vacuum blood collection tube and a proximal end that is the end opposite to the needle tip;
A blood collection needle main body fixing portion capable of fixing a blood collection needle main body having a needle tip inserted into a blood vessel and a proximal end located at an end opposite to the needle tip on the proximal end side; A communication needle fixing portion that fixes the communication needle on the proximal end side of the communication needle, and a blood flow path that connects the proximal end of the blood collection needle body and the proximal end of the communication needle is provided therein. A needle fixing member
In the middle of the blood flow path inside the needle fixing member, a hole is formed so as to intersect the blood flow path, and a first side continuous with the blood collection needle body of the blood flow path is formed on a side surface of the hole. A flow path portion and a second flow path portion connected to the communication needle are open,
The valve further includes a valve that is inserted into the hole and has an internal flow path that intersects the length direction of the hole, and the internal flow path of the valve is open to the side surface of the hole. The valve can be moved within the hole so that a first state communicating with the passage portion and a second state blocking the blood flow between the first and second flow path portions can be taken. An adapter for a blood collection needle, characterized in that   The blood sampling needle adapter according to claim 1, wherein the bulb has a small-diameter portion inserted into the hole and an operation portion that is disposed outside the hole and has a shape larger than the small-diameter portion.   A first state in which the internal flow path communicates with the first and second flow path portions; and a second state in which the internal flow path does not communicate between the first and second flow path portions. The blood sampling needle adapter according to claim 1 or 2, wherein the valve is configured to be rotatable within the hole.   The blood sampling needle adapter according to claim 3, wherein a female screw is formed on an inner peripheral surface of the hole, and a male screw is formed on an outer peripheral surface of a portion inserted into the hole of the valve.   The valve is configured to be movable in the length direction of the hole within the hole, and the internal flow path communicates between the first and second flow path portions; The valve is configured to be movable in the length direction of the hole in the hole so that the internal flow path can be in the second state where the first and second flow path portions are not communicated with each other. The adapter for blood collection needles of Claim 1 or 2. A cylindrical holder body configured to have an opening at one end and a vacuum blood collection tube to be inserted from the opening side;
A vacuum blood collection holder comprising the blood collection needle adapter according to any one of claims 1 to 5, which is attached at an end opposite to the opening of the cylindrical holder main body. . A blood collection needle adapter according to any one of claims 1 to 5, and a blood collection needle main body having a proximal end portion fixed to a blood collection needle main body fixing portion of the blood collection needle adapter. A blood collection needle for vacuum blood collection.

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