JPH0339695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a blood sampling device used for blood sampling.

[Prior Art] Conventionally, various blood sampling instruments have been used, for example, in clinical tests and biochemical tests. A blood sampling device consisting of a blood sampling tube holder equipped with a puncture needle is often used. A blood collection tube consists of a tube body and a stopper that seals the opening of the tube.The tube body is made of glass, synthetic resin, etc., and the stopper is generally made of a rubber material such as vulcanized butyl rubber.
The inside of the blood collection tube is kept under reduced pressure. The blood collection tube holder is a cylindrical body into which a blood collection tube can be inserted from the rear end, and a puncture needle is attached to the front end. The puncture needle has a blood collection needle part that protrudes forward and is punctured into the human body, etc., and a hollow needle part that protrudes backward, and a hub is provided in the middle part between the blood collection needle part and the hollow needle part. It is attached to the blood collection tube holder. Further, the puncture needle is provided with an elastic sheath (for example, a rubber tip) that encloses the hollow needle portion.

When blood is collected using a blood sampling device having such a configuration, first, the blood sampling needle portion, which is the tip of the puncturing needle of the blood sampling tube holder, is punctured into a blood vessel. Next, the blood collection tube is inserted into the blood collection tube holder until the tip of the hollow needle portion, which is the rear end of the puncture needle, pierces the stopper of the blood collection tube and reaches the inside of the blood collection tube. At this time, the rubber tip is folded into a bellows shape between the stopper and the blood collection tube holder.

If the frictional force between the stopper and the hollow needle is weak, the blood collection tube may be pushed backwards and detached (hereinafter referred to as "kickback") due to the repulsive force of the rubber tip. For this reason, plugs that prevent this backlash from occurring have been used. However, when such a plug is used, there is a problem in that the puncture resistance of the hollow needle portion to the plug is large and the plug cannot be easily punctured.

In order to solve this problem, the applicant has proposed a blood sampling device as shown in Japanese Patent Application Laid-Open No. 61-90643. This blood sampling device is shown in FIG. In the blood sampling device shown in FIG.
A stopper 56 is provided at the opening to form a blood collection tube, and the blood collection tube holder 52 has a puncture needle 54 at its tip. Further, at the rear end of the puncture needle 54,
A rubber tip 58 is encapsulated, and the outer surface of the distal end portion of the tube body 50 is provided with two ribs 60 extending in the axial direction. Correspondingly, the inner diameter of the tip of the blood collection tube holder is a reduced diameter portion 62. This rib 60 and the reduced diameter part 6 of the holder
2 contact and engage with each other to prevent backlash. In order to solve the above-mentioned problems, the applicant has proposed a blood sampling device as shown in Japanese Patent Application Laid-Open No. 60-232134. This is provided with ribs extending in the axial direction on the outer surface of the rubber stopper forming the stopper of the blood collection tube, and the ribs come into contact with the inner surface of the blood collection tube holder to prevent backlash due to the frictional force. Furthermore, in order to solve the above-mentioned problems, the present applicant has proposed a blood sampling device as disclosed in Japanese Patent Application Laid-Open No. 61-90644. In this method, a protruding rib is provided on the inner surface of the blood collection tube holder, and the rib comes into contact with the tube body or plug of the blood collection tube to prevent backlash.

[Problems to be Solved by the Invention] In the blood sampling device described above, the blood sampling tube can be inserted into the blood sampling tube holder more easily than the conventional device in which the friction force between the rubber stopper and the hollow needle part is used to prevent backlash. Since the prevention of backlash is achieved by the frictional force between the stopper or tube constituting the blood collection tube and the inner surface of the blood collection tube holder, it requires considerable force to insert the blood collection tube into the blood collection tube holder. Considerable force was also required to remove the blood vessel.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blood sampling device that allows a blood sampling tube to be easily inserted into a blood sampling tube holder, that can be easily removed, and that prevents backlash.

[Means for solving the problem] The solution to the above problem consists of a blood collection tube whose open end is sealed with a sealing member, a blood collection needle protruding to one side, and a hollow needle protruding to the other side. The puncture needle has a needle tube and an elastic sheath body enclosing the hollow needle portion, and the puncture needle is a hollow body with an open rear end, and the blood collection tube can be inserted and removed from the rear end side, and the puncture needle A blood collection needle protrudes from the tip of the hollow body,
and a blood collection tube holder equipped with the puncture needle at the tip of the hollow body so that the hollow needle protrudes into the hollow body, the blood collection tube being outside the outer surface of the blood collection tube. Further, the blood collection tube holder has a rib that protrudes toward the blood collection tube holder, and the hollow needle portion pierces the sealing member of the blood collection tube inserted into the blood collection tube holder, and the elastic sheath body is attached to the sealing member. a lock having a surface angled with respect to the axial direction of the blood collection tube holder that contacts at least a portion of the bottom side surface of the blood collection tube of the rib at a position where the rib is compressed in the axial direction; further, the blood collection tube holder holds the blood collection tube in the blood collection tube holder until the surface of the rib and the surface of the locking portion engage with each other due to the repulsive force of the elastic sheath. The engagement between the locking portion and the rib is a locking force greater than the repulsive force of the elastic sheath when the elastic sheath is compressed in the axial direction. It is a powerful blood sampling device.

The locking portion of the blood collection tube holder and the rib of the blood collection tube prevent the blood collection tube from tilting after the sealing member of the blood collection tube inserted into the blood collection tube holder is punctured by the hollow needle. It is preferable that contact is made by rotating and/or rotating. Furthermore, it is preferable that the blood collection tube consists of a tube body with one end open and a sealing member that seals the opening, and that the inside of the blood collection tube is under reduced pressure. Furthermore, the rib of the blood collection tube is
Preferably, it is provided in a tube. Further, the sealing member of the blood collection tube is preferably in the form of a film that has gas barrier properties and sealing properties that allow the puncture hole to be closed after the punctured hollow needle is removed. Further, it is preferable that the locking portion of the blood collection tube holder is a recess provided on the inner surface of the blood collection tube holder. Further, it is preferable that the locking part of the blood collection tube holder is a protrusion that projects inward from the inner surface of the blood collection tube holder. Further, it is preferable that the locking portion of the blood collection tube holder is a notch provided in the blood collection tube holder.

The blood sampling device of the present invention will be explained using an embodiment shown in FIG.

The blood sampling device of this embodiment has an open end with a sealing member 1.
A puncture needle 3 having a blood collection tube 1 sealed by a needle 0, a needle tube consisting of a blood collection needle part 7 protruding to one side and a hollow needle part 8 protruding to the other side, and an elastic sheath body 9 enclosing the hollow needle part 8. , is a hollow body with an open rear end, into which the blood collection tube 1 can be inserted detachably from the rear end side, the blood collection needle part 7 of the puncture needle 3 protrudes from the tip of the hollow body, and the hollow needle part 8 is A blood sampling device consisting of a blood sampling tube holder 2 equipped with a puncture needle 3 at the tip of the hollow body so as to protrude into the hollow body, the blood sampling tube 1
has a rib 6 that protrudes outward from the outer surface of the blood collection tube 1;
is pierced by the hollow needle part 8 and comes into contact with at least a part of the bottom side surface of the blood collection tube 1 of the rib 6 at a position where the elastic sheath body 9 is compressed in the axial direction by the sealing member 10. The blood collection tube holder 2 includes a locking portion 5 having a surface at an angle with respect to the axial direction of the blood collection tube holder 2, and the surface of the rib 6 and the surface of the locking portion 5 are elastic. The blood collection tube 1 can be comfortably inserted into the blood collection tube holder 2 until it is engaged by the repulsive force of the sheath body 9, and
The engagement between the locking portion 5 and the rib 6 has a locking force that is greater than the repulsive force of the elastic sheath body 9 when the elastic sheath body 9 is compressed in the axial direction.

Specifically, the blood sampling device of the present invention consists of a blood sampling tube 1 and a blood sampling tube holder 2 into which the blood sampling tube 1 can be inserted.
A puncture needle 3 is attached.

The blood collection tube 1 consists of a bottomed tube body 4 with an open end and a sealing member 10 that airtightly seals the opening.
The inside of the blood collection tube 1 is in a reduced pressure state. Pipe body 4
As the material, a material with high gas barrier properties is preferable, and glass, polyvinyl chloride, polyethylene terephthalate, etc. are preferably used. In addition, when the tube body 4 is formed of a material with low gas barrier properties, the surface (for example, the outer surface) of the tube body 4 may be coated with a film having gas barrier properties such as polyvinyl alcohol or ethylene-vinyl alcohol copolymer. It is preferable to do so. In addition, when the tube body 4 is formed of polyvinyl chloride, an elution preventive agent is added to the inner surface of the tube body 4 to prevent the stabilizer contained in the vinyl chloride from eluting into the collected blood. It is preferable to coat the

Furthermore, in the tube body 4, heparin powder, EDTA
An anticoagulant such as -2K is attached or housed on the inner surface, and depending on the application, a serum separating agent and a coagulation accelerator are attached or housed on the inner surface.

The outer surface of the tubular body 4 is provided with an annular rib that projects outward and forms the rib 6 of the blood collection tube. This rib 6 is for engaging with a locking portion 5 of the blood collection tube holder 2, which will be described later, to prevent the blood collection tube 1 from coming off from the blood collection tube holder 2. The rib 6 of the blood collection tube may have any shape as long as it can engage with the locking portion 5 of the blood collection tube holder 2. For example, a plurality of ribs are provided in the shape of a gear, one or more ribs are provided in a half-arc shape or a crescent shape, and one or more short ribs are provided extending in the axial direction of the tube body 4. Things can be considered. Preferably, it is an annular rib that runs perpendicular to the axial direction of the tube body 4 as shown in FIG. This is because engagement becomes easier. Further, it is preferable that the shape of the rear end side, that is, the bottom side surface of the tube body 4 of the rib 6 of the blood collection tube (the surface that comes into contact with the locking part of the blood collection tube holder, which will be described later), is flat. This is because it will surely come into contact with the locking portion 5 of the blood collection tube holder 2, and the engagement will be reliable. As for the size of the rib 6 of the blood collection tube, the width that protrudes from the outer surface of the blood collection tube 1 is 0.5 mm to
Preferably, it is 5.0 mm, more preferably,
It is 1.0mm to 2.5mm.

The sealing member 10 airtightly attached to the opening of the tube body 4 is a member that can be pierced by the hollow needle part 8 of the puncture needle 3 attached to the blood collection tube holder 2.
Moreover, it has enough strength to not be damaged by the repulsive force of the elastic sheath body 9 that encloses the hollow needle part 8.
Further, in the blood sampling device of the present invention, the sealing member 10 is
Since the blood collection tube may be tilted and/or rotated after being pierced by the hollow needle portion 8, the frictional force between the two must be of a level that allows this. The sealing member 10 having the above function is made by providing a gas barrier member with high airtightness on the lower side, a sealing member on the upper side, and bonding the two in a layered manner, and furthermore, an adhesive film is provided below the gas barrier member. It is a combination. This sealing member is attached by airtightly covering the periphery of the opening of the tube body 4 with an adhesive film. Also,
The positions of the gas barrier member and the sealing member may be reversed, and the sealing member may be fixed to the front surface (or back surface) of the central portion of the gas barrier member instead of being layered. The gas barrier member must be made of a material that can maintain the reduced pressure inside the tube body 4, and includes, for example, metal foil such as aluminum foil, resin film material such as ethylene-vinyl alcohol copolymer, and polyvinylidene chloride. etc. can be used. The sealing member needs to be made of a material that can close the puncture hole and maintain a liquid-tight state after the sealing member 10 is pierced by the hollow needle part 8 and removed, such as natural rubber or isoprene rubber. Rubber materials such as , styrene-butadiene rubber, and silicone rubber, or resins such as thermoplastic elastomers can be used.

Furthermore, although the film-like sealing member was used in the above explanation, the present invention is not limited to this, but it is also possible to use a stopper (rubber stopper) of a conventional shape (as shown in FIG. In addition to reducing the frictional force with the plug, at least the surface (or back surface) near the thin part of the plug body, or more precisely, the entire surface exposed to the outside when attached to the pipe body, is covered with a gas barrier material. may also be used.

Furthermore, in the above description, the tube body 4 constituting the blood collection tube 1 is provided with ribs 6.
The present invention is not limited to this, and ribs may be formed in the sealing member 10. For example, the sealing member 10 may be larger than the opening surface of the tube body 4, and the portion projecting outward from the opening surface of the tube body 4 may form a rib. In this case, if the sealing member does not have enough hardness to engage with the locking part of the blood collection tube holder, an annular reinforcing member may be provided on the front or back side of the sealing member. A rib that easily engages with the locking portion of the blood collection tube holder can be formed. Further, the shapes of the ribs and the reinforcing member in this case are the same as those in the case where the tube body 4 is provided with ribs.

In addition, in the above explanation, an example in which a rib is used in the locking part of the blood collection tube has been explained, but this is not limited to this, and conversely, a ring-shaped, semi-arc-shaped, or crescent-shaped A groove may be provided, and a rib may be formed on the surface of the groove on the distal end side of the blood collection tube 1 to engage with a locking portion of the blood collection tube holder.

The blood collection tube holder 2 is a hollow body with an open rear end, and a puncture needle 3 is attached to the tip thereof. The puncture needle 3 is attached by screwing the hub 11 of the puncture needle 3 into a threaded portion formed at the tip of the blood collection tube holder 2. Furthermore, the present invention is not limited to this, and the hub of the puncture needle may be directly fixed to the blood collection tube holder. Puncture needle 3 is
A blood collection needle part 7 that protrudes on one side and pierces the blood vessel and a hollow needle part 8 that protrudes on the other side and pierces the sealing member 10 of the blood collection tube 1 to be inserted are formed, and an elastic material that encloses the hollow needle part 8. It has a sheath body 9. The elastic sheath is usually a rubber chip made of rubber material.

The shape of the blood collection tube holder 2 must be such that the blood collection tube 1 can be inserted easily, and the blood collection tube 1 can be inserted without substantially contacting the inner surface of the blood collection tube holder 2, in other words. For example, it is necessary that the blood collection tube 1 can be inserted into the blood collection tube holder 2 with some clearance. In this way, if it can be inserted with enough room, the blood collection tube 1
can be easily inserted, and the inserted blood collection tube 1 can be tilted or rotated easily inside the blood collection tube holder 2, and furthermore, can be tilted and rotated both. By doing so, the blood collection tube 1 can be inserted into the holder 2 with almost no resistance.

As shown in FIG. 1, the sealing member 10 of the blood collection tube 1 inserted into the blood collection tube holder 2 is pierced by the hollow needle part 8 into the inner surface of the blood collection tube holder 2, and the elastic sheath 9 is inserted into the inner surface of the blood collection tube holder 2. A locking portion 5 of the blood collection tube holder is provided which engages with a rib 6 of the blood collection tube at a position where the blood collection tube holder is compressed in the axial direction by the sealing member 10. The locking portion 5 is an annular recess extending perpendicularly to the axial direction of the blood collection tube holder 2 . The annular recess is formed by a surface having an angle with respect to the axial direction of the blood collection tube holder 2 (specifically, a surface substantially perpendicular to )have.

FIG. 2 is a sectional view of the blood collection tube holder cut at the locking portion of the blood collection tube holder. The locking part 5 of this blood collection tube holder is connected to the blood collection tube 1 described above.
The rib 6 of the puncture needle 3 engages with the rib 6 to prevent the blood collection tube 1 from separating from the blood collection tube holder 2 due to the repulsive force of the elastic sheath 9 of the puncture needle 3. Therefore, the engagement force between the rib 6 of the blood collection tube 1 and the locking part 5 of the blood collection tube holder 2 is such that the sealing member 10 of the blood collection tube 1 is pierced by the hollow needle part 8 of the puncture needle 3, and the sealing member It is necessary that the locking force is greater than the repulsive force of the elastic sheath body 9 when the elastic sheath body 9 is compressed in the axial direction by the elastic sheath body 10. If it is like the one shown in Figure 1, blood collection tube 1
After the sealing member 10 is pierced by the hollow needle part 8,
A part of the rib 6 of the blood collection tube enters a part of the recess of the locking part 5 of the blood collection tube holder, so that the blood collection tube 1
is tilted slightly with respect to the axial direction of the blood collection tube holder 2, or by tilting the blood collection tube 1 slightly with respect to the axial direction of the blood collection tube holder 2, a part of the rib 6 of the blood collection tube is It enters a part of the recess of the locking part 5 of the holder, and a part of the rib of the blood collection tube and a part of the locking part of the blood collection tube holder engage, resisting the repulsive force of the elastic sheath body 9, and the blood collection Prevents blood vessel withdrawal.

The locking portion 5 of the blood collection tube holder may have any shape as long as it can engage with the rib 6 of the blood collection tube 1. For example, if the rib of the blood collection tube is a rib that protrudes like a gear, the cross section is gear-shaped and has a plurality of recesses that engage with the rib of the blood collection tube. In the case of an annular, semi-arc-shaped or crescent-shaped protruding rib, one or more semi-arc-shaped or crescent-shaped recesses that engage with the rib are provided, and the rib of the blood collection tube is If the rib extends to
It is conceivable to provide one or more recesses extending in the axial direction of the blood collection tube holder 2 that engages with the ribs. Preferably, the locking part of the blood collection tube holder is an annular recess extending perpendicularly to the axial direction as shown in FIG. 1, and the rib of the blood collection tube is an annular rib.
In the case of these combinations, there is a locking part of the blood collection tube holder all around the inner surface of the blood collection tube holder, and there are ribs of the blood collection tube all around the outer surface of the blood collection tube, so mutual engagement is easy and reliable. This is because.

In addition, the holder 2 of the locking part 5 of the blood collection tube holder
The shape of the rear end surface (this surface is a surface that contacts the bottom surface of the rib 6 and is also a surface that has an angle with respect to the axial direction of the holder 2) is flat. This is preferable because it ensures reliable contact with the rib 6 of the blood collection tube 1 and ensures reliable engagement.

The depth of the concave portion constituting the locking portion 5 of the blood collection tube holder is preferably 0.2 mm to 2.0 mm, more preferably 0.5 mm to 1.0 mm.

In addition, the rib of blood collection tube 1 and the blood collection tube holder 2
If the locking parts of the blood collection tube are not both continuous annular, after inserting the blood collection tube into the blood collection tube holder, rotate the blood collection tube until the rib of the blood collection tube and the locking part of the blood collection tube holder can engage. It is necessary to engage the two.

Further, the positions of the locking part 5 of the blood collection tube holder 2 and the rib 6 of the blood collection tube 1 are determined by the position of the sealing member 1 of the blood collection tube 1.
However, it is only necessary that the two can be engaged in the state in which they are pierced by the hollow needle part 8, and it does not have to be on the distal end side of the blood collection tube 1 and the blood collection tube holder 2. They may be provided at positions spaced apart by a certain distance. However, if the rib of the blood collection tube and the locking part of the blood collection tube holder engage with each other when the blood collection tube is tilted, then when the blood collection tube is tilted, the tip of the blood collection tube will not fit into the blood collection tube holder. It is necessary to provide each at a position where the rib of the blood collection tube and the locking part of the blood collection tube holder engage with each other before contacting the inner surface of the blood collection tube 2.

Next, an embodiment of the blood sampling device of the present invention shown in FIG. 3 will be described. Note that the same parts are given the same numbers as in FIG. 1.

The difference between the blood sampling device of this embodiment and the blood sampling device shown in FIG. The locking portions are two notches that communicate the inside and outside of the blood collection tube holder 2.

FIG. 4a is a cross-sectional view of the blood collection tube holder cut at the notch. When the rib of the blood collection tube enters this notch, the two engage with each other.
Therefore, it is necessary that the notch has a width that allows the rib of the blood collection tube to fit therein. The longer the length of the notch, the easier it is to engage with the rib of the blood collection tube, which is preferable, but if it is too long, the strength of the blood collection tube holder will decrease, so it should be 2/10 to 7 of the total circumference of the blood collection tube holder. The ratio is preferably about /10, more preferably 4/10 to 6/10. Further, it is preferable to provide a plurality of notches as shown in FIG. 4a, and it is particularly preferable to provide two notches at opposing positions. In this case, the length of each notch is preferably about 1/10 to 3.5/10, more preferably 2/10 to 3/10 of the total circumference of the blood collection tube holder.

Furthermore, it is preferable that the ribs 6 of the blood collection tube 1 can be reliably engaged with the locking portions 5 of the blood collection tube holder 2, and for this purpose, as shown in FIG. 4b,
The rib 6 of the blood collection tube 1 is connected to the locking portion 5 of the blood collection tube holder.
It is preferable that the length be suitable for the shape of the tube (shorter than the length of the notch of the blood collection tube holder).

Next, an embodiment of the blood sampling device of the present invention shown in FIG. 5 will be described. Note that the same parts are given the same numbers as in FIG. 1.

The difference between the blood sampling device of this embodiment and the blood sampling device shown in FIG. The locking portion is an annular protrusion that protrudes inward of the blood collection tube holder 2. FIG. 6 is a sectional view of the blood collection tube holder taken along the line X--X on the distal side of the locking portion of the blood collection tube holder.

The shape of the blood collection tube holder 2 must be such that the blood collection tube 1 can be easily inserted, and the blood collection tube 1 can be inserted without the outer surface of the blood collection tube 1 substantially coming into contact with the inner surface of the blood collection tube holder 2. In this embodiment, the annular protrusion also has an inner diameter such that the outer surface of the blood collection tube 1 including the rib 6 can be inserted without substantially contacting the inner surface of the blood collection tube holder 2. It is necessary to have one. Furthermore, the annular protrusion does not necessarily have to be annular; for example, it may have a plurality of gear-shaped protrusions, or it may have one or more semi-arc-shaped or crescent-shaped protrusions. Conceivable. Preferably, it is an annular protrusion extending perpendicularly to the axial direction of the blood collection tube holder 2 as shown in FIG.
This is because if the annular protrusion is used, the locking portion 5 of the blood collection tube holder 2 is present on the entire inner circumference of the blood collection tube holder 2, making it easier to engage with the rib 6 of the blood collection tube 1. In addition, the shape of the surface of the protrusion on the tip side of the blood collection tube holder (this surface is the surface that contacts the bottom surface of the rib 6 and is also the surface that has an angle with respect to the axial direction of the holder 2) is , it is preferable to have a flat shape, since this ensures reliable contact with the ribs constituting the ribs 6 of the blood collection tube and ensures reliable engagement. As for the size of the protrusion, the width of the protrusion protruding from the inner surface of the blood collection tube holder 2 is preferably 0.2 mm to 2.0 mm, more preferably 0.5 mm to 1.0 mm. Further, it is preferable that the surface of the protrusion on the rear end side of the blood collection tube holder has a gently sloped surface as shown in FIG. By doing so, the ribs forming the ribs 6 of the blood collection tube 1 will not get caught on the annular protrusion, and the blood collection tube can be easily inserted into the blood collection tube holder. Conversely, the surface of the rib of the blood collection tube 1 on the distal end side of the blood collection tube may be a gently sloped surface as described above. By providing the rib of the blood collection tube and the locking part of the blood collection tube holder with such a configuration, when the blood collection tube 1 is inserted into the blood collection tube holder 2, the rib of the blood collection tube of the blood collection tube will be attached to the blood collection tube of the blood collection tube holder. Once the holder passes the locking part, the two will naturally engage, and the blood collection tube will be slightly tilted.
In addition, if they do not engage naturally, by slightly tilting the blood collection tube, they will easily engage and prevent the blood collection tube from coming off.

In the above description, the blood collection tube holder 2 has a protrusion fixed to the inner surface, but the present invention is not limited to this, and as shown in FIG. By inserting a plate-shaped or rod-shaped member 22 into the slit 20, it may be used as a locking part of the blood collection tube holder that engages with the rib 6 of the blood collection tube 1. More preferably, the member 22 is rotatably fixed to the outer surface of the blood collection tube holder 2 with a fixture 24 so that it can be inserted and removed, thereby making it easier to insert and remove the member 22 into the slit 20. Furthermore, by making the lower end shape of the member 22 the same as or similar to the outer shape of the blood collection tube, the blood collection tube 1
engagement with the ribs of the blood collection tube is ensured.

In this embodiment, the work of inserting the member 22 is increased in order to engage the rib of the blood collection tube with the locking portion of the blood collection tube holder, but on the other hand, by removing the member 22, it is extremely easy to remove the blood collection tube. can be removed from the blood collection tube holder.

Next, an embodiment of the blood sampling device of the present invention shown in FIG. 8 will be described. Note that the same parts are given the same numbers as in FIG. 1.

In this embodiment, the blood collection tube holder 2 is formed of a cylindrical body having two flat surfaces 30 facing each other. Two notches 32 are provided in the flat surface portion 30 to communicate the inside and outside of the blood collection tube holder 2, and these cutouts form a locking portion of the blood collection tube holder. The flat surface 30 continues to the rear end of the blood collection tube. FIG. 9 is a sectional view of the blood collection tube holder 2 cut at the notch portion 32, and FIG. 10 is a sectional view of the blood collection tube cut at the rib 36 portion. The blood collection tube 1 has a rib 36 that is divided into two by a straight portion 34 that is cut out to match the shape of the flat surface of the blood collection tube holder 2.
This rib 36, which has a 100 mm diameter, engages with the rear end surface of the blood collection tube holder of the notch 32. In order to engage the rib 36 and the notch 32, after inserting the blood collection tube into the blood collection tube holder, the notch 32
When the rib 36 reaches , the two are engaged by rotating the blood collection tube.

Further, the number of ribs 36 may be one, and similarly the number of flat surfaces 30 may be one. Furthermore, the flat surface has ribs 36
Any shape may be used as long as it forms the rear end of the notch 32 that engages with the notch, and if it is present immediately after the notch 32, it may be in an arcuate shape continuous with other parts. It does not have to extend to the rear end of the blood vessel holder.

The length of the notch 32 needs to be longer than the rib 36. If it is too long, the strength of the blood collection tube holder will decrease, so the length of the notch 32 should be 2/10 of the total circumference of the blood collection tube holder.
~7/10 is preferable, more preferably 4/10~
It is 6/10. Moreover, it is preferable to provide a plurality of notches, and it is particularly preferable to provide two notches at opposing positions. In this case, the length of each notch should be 1/10 to 3.5/of the total circumference of the blood collection tube holder.
Approximately 10 is preferable, more preferably 2/10 to 3/10
It is.

Next, embodiments of the blood sampling device of the present invention will be described.

(Example 1) As a blood collection tube, polyethylene terephthalate was injection molded into the shape shown in Fig. 1, and the inner volume was
I created one for 10c.c. An annular rib that protruded outward and had a flat rear end surface was formed at the open end of the tube. The annular rib had a thickness of 0.8 mm, and a length protruding from the outer surface of the tube body was 1.2 mm. The outer diameter of the tube including the annular rib was 16.8 mm. As a sealing member for the tube body, the upper layer is a vulcanized natural rubber sheet (sealing member) with a thickness of 1.3 mm, and the lower layer is a polyethylene terephthalate film (thickness: 45 μm) with aluminum vapor-deposited on the surface, which is pasted together using epoxy adhesive. . This sealing member was heat-sealed to the open end of the tube and the surface of the rib under a constant reduced pressure to produce a reduced pressure blood collection tube.

As a blood collection tube holder, a cylindrical holder as shown in FIG. 1 was made of polypropylene. A threaded portion that threadedly engaged with the hub of the puncture needle was formed at the tip. In addition, an annular recess with a depth of 0.5 mm, a width of 1.0 mm, and a flat surface on the rear end side was formed at a position 15.0 mm back from the inner surface of the tip. The inner diameter of the holder was 16.9 mm.

Then, a puncture needle is attached to the tip of the blood collection tube holder, and the hollow needle part, which is the rear end of the puncture needle, is encapsulated with a cylindrical rubber tip (inner diameter 0.8 mm, wall thickness 0.4 mm) with the rear end closed. A blood sampling device of the present invention was created.

Therefore, holding the blood collection tube holder of this blood collection device in the left hand and holding the blood collection tube in the right hand, the blood collection tube was inserted into the blood collection tube holder, and the blood collection needle portion of the puncture needle was punctured into the blood vessel. When the blood collection tube was pressed, the sealing member of the blood collection tube was pierced by the hollow needle, and it was confirmed that blood flowed into the blood collection tube from the outside through the puncture needle. Furthermore, when the blood collection tube was pushed, the upper part of the rib of the blood collection tube entered the upper part of the recess of the blood collection tube holder, and the blood collection tube was tilted slightly. At this time, the rubber tip was in a folded state, but even when the patient took his hand off the blood collection tube, the blood collection tube did not retreat backwards. Furthermore, by holding the rear end of the blood collection tube and lifting it parallel to the axis of the blood collection tube holder, the blood collection tube naturally retracted, making it possible to easily remove the blood collection tube.

(Example 2) As a blood collection tube holder, a cylindrical holder as shown in FIG. 3 was made of polypropylene. A threaded portion that threadedly engaged with the hub of the puncture needle was formed at the tip. In addition, two notches were formed at opposite positions, each having a width of 1.2 mm in the axial direction of the holder and a length of 15.0 mm (arc length) perpendicular to the axis, at a position 15.0 mm back from the inner surface of the tip. The inner diameter of the holder is
It was 16.9mm. As shown in Fig. 4b, a blood collection tube was prepared having two ribs each having a thickness of 0.8 mm and an arc length of 10.0 mm at symmetrical positions. As for the puncture needle, the same one as in Example 1 was used,
A blood sampling device of the present invention was created.

As in Example 1, a blood collection tube was inserted into the blood collection tube holder of this blood collection device. When you insert the blood collection tube,
The upper part of the rib of the blood collection tube entered the notch in the upper part of the blood collection tube holder, and the blood collection tube was tilted slightly. At this time, even when the hand was removed from the blood collection tube, the blood collection tube did not retreat backwards. Furthermore, by holding the rear end of the blood collection tube and lifting it parallel to the axis of the blood collection tube holder, the blood collection tube naturally retracted, making it possible to easily remove the blood collection tube.

(Example 3) As a blood collection tube holder, a cylindrical holder as shown in FIG. 5 was made of polypropylene. A threaded portion that threadedly engaged with the hub of the puncture needle was formed at the tip. In addition, an annular protrusion was provided at a position 15.0 mm back from the inner surface of the tip, with the tip side being flat and the rear end side being gently inclined. The height of this annular protrusion was 0.5 mm. The inner diameter of the holder at this annular protrusion portion was 16.9 mm. The blood sampling device of the present invention was created using the same blood sampling tube and puncture needle as in Example 1.

As in Example 1, a blood collection tube was inserted into the blood collection tube holder of this blood collection device. When you insert the blood collection tube,
When the upper part of the rib of the blood collection tube exceeded the upper part of the annular protrusion of the blood collection tube holder, the blood collection tube was tilted slightly. At this time, even if the hand was removed from the blood collection tube, the blood collection tube did not retreat backwards. Furthermore, if you hold the rear end of the blood collection tube and lift it parallel to the axis of the blood collection tube holder, the blood collection tube will naturally retreat.
The blood collection tube could be easily removed.

[Operation] A case in which blood is collected using the blood sampling device of the present invention will be described using the embodiment shown in FIG.

First, the blood sampling needle portion 7, which is the tip of the puncturing needle 3 attached to the blood sampling tube holder 2, is punctured into a blood vessel. Next, hold the blood collection tube holder 2 until the tip of the hollow needle part 8, which is the rear end of the puncture needle 3, pierces the elastic sheath 9 and the sealing member 10 of the blood collection tube 1 and reaches the inside of the blood collection tube. insert. At this time, the elastic sheath body 9 is folded into a bellows-like state between the stopper and the blood collection tube holder, and blood flows into the blood collection tube 1. Further, when the blood collection tube 1 is pushed in the distal direction, the upper part of the rib 6 of the blood collection tube 1 engages with the locking part 5 of the blood collection tube holder 2, and the blood collection tube is slightly tilted. In addition, if the rib of the blood collection tube and the locking part of the blood collection tube holder do not naturally engage with each other during the insertion process of the blood collection tube 1 due to the frictional force between the sealing member 10 of the blood collection tube 1 and the hollow needle part 8, Both can be engaged by slightly tilting the blood collection tube 1. After collecting blood according to the amount of decompression of the blood collection tube 1, when holding the blood collection tube by the rear end and lifting it parallel to the axis of the blood collection tube holder, the blood collection tube will naturally retreat. The blood collection tube can be easily removed and blood collection is completed.

[Effects of the Invention] The blood collection device of the present invention includes a blood collection tube whose open end is sealed with a sealing member, a needle tube consisting of a blood collection needle protruding on one side and a hollow needle protruding on the other side, and the hollow needle covered. a puncture needle having an elastic sheath body enclosing the puncture needle;
It is a hollow body with an open rear end, and the blood collection tube can be inserted and removed from the rear end side, and the blood collection needle portion of the puncture needle protrudes from the tip of the hollow body, and the hollow needle portion is inserted into the hollow body. A blood collection device comprising a blood collection tube holder equipped with the puncture needle at the tip of the hollow body so as to protrude into the body, the blood collection tube having a rib projecting outward from the outer surface of the blood collection tube. ,moreover,
The blood collection tube holder is at a position where the sealing member of the blood collection tube inserted into the blood collection tube holder is pierced by the hollow needle portion and the elastic sheath body is compressed in the axial direction by the sealing member. , further comprising a locking portion having a surface angled with respect to the axial direction of the blood collection tube holder, which contacts at least a part of the surface of the rib on the bottom side of the blood collection tube, and the blood collection tube holder further comprises: , the blood collection tube can be comfortably inserted into the blood collection tube holder until the surface of the rib and the surface of the locking portion are engaged by the repulsive force of the elastic sheath; In addition, since the engagement between the locking portion and the rib has a locking force that is greater than the repulsive force of the elastic sheath when the elastic sheath is compressed in the axial direction, The blood collection tube can be easily inserted into the blood vessel holder, and after insertion, the rib of the blood collection tube and the locking part of the blood collection tube holder engage to prevent the blood collection tube from coming off due to the repulsive force of the elastic sheath. Furthermore, the blood collection tube can be easily removed by releasing the engagement between the rib of the blood collection tube and the locking portion of the blood collection tube holder.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the blood sampling device of the present invention, FIG. 2 is a cross-sectional view of the blood collection tube holder cut at the locking part of the blood collection tube holder of the embodiment shown in FIG. The figures are a cross-sectional view showing another embodiment of the blood sampling device of the present invention, Figure 4a is a cross-sectional view of the blood collection tube holder of the embodiment shown in Figure 3, cut at the locking part, and Figure 4b 5 is a cross-sectional view showing another embodiment of the blood sampling device of the present invention, and FIG. 6 is a diagram showing the embodiment of FIG. 5 as seen from the rear. A cross-sectional view of the blood collection tube holder taken along the X-X line, FIG. 7 is a cross-sectional view showing another embodiment of the blood collection device of the present invention, and FIG. 8 is a cross-sectional view showing another embodiment of the blood collection device of the present invention. FIG. 9 is a cross-sectional view of the blood collection tube holder of the embodiment shown in FIG.
The figure is a rear view of the blood collection tube of the embodiment shown in FIG. 8, and FIG. 11 is a sectional view showing a conventional blood collection device. DESCRIPTION OF SYMBOLS 1... Blood collection tube, 2... Blood collection tube holder, 3... Puncture needle, 4... Tube body, 5... Locking part of blood collection tube holder, 6... Rib of blood collection tube, 7... Blood collection needle part, 8...
... hollow needle part, 9 ... elastic sheath body, 10 ... sealing member.

Claims (1)

[Scope of Claims] 1. A blood collection tube whose open end is sealed with a sealing member, a needle tube consisting of a blood collection needle protruding on one side and a hollow needle protruding on the other side, and an elastic sheath covering the hollow needle. a puncture needle having a hollow body with an open rear end, into which the blood collection tube can be inserted detachably from the rear end side, a blood collection needle portion of the puncture needle protruding from the tip of the hollow body, and A blood collection device comprising a blood collection tube holder equipped with the puncture needle at the tip of the hollow body so that the hollow needle protrudes into the hollow body, the blood collection tube being located outwardly from the outer surface of the blood collection tube. Further, the blood collection tube holder has a rib that protrudes from the blood collection tube holder, and the hollow needle portion pierces the sealing member of the blood collection tube inserted into the blood collection tube holder, and the elastic sheath body is pierced by the sealing member. a locking portion having a surface at an angle with respect to the axial direction of the blood collection tube holder that contacts at least a part of the surface of the rib on the bottom side of the blood collection tube at a position where the rib is compressed in the axial direction; Further, the blood collection tube holder is configured to hold the blood collection tube in the blood collection tube holder until the surface of the rib and the surface of the locking portion are engaged by the repulsive force of the elastic sheath. can be inserted with ample space, and the engagement between the locking portion and the rib is such that
A blood sampling device characterized in that the elastic sheath has a locking force that is greater than the repulsive force of the elastic sheath when it is compressed in the axial direction. 2. The locking part of the blood collection tube holder and the rib of the blood collection tube are such that the sealing member of the blood collection tube inserted into the blood collection tube holder is punctured by the hollow needle, and the elastic sheath body is axially moved by the sealing member. The blood sampling device according to claim 1, wherein the blood sampling tube is engaged by tilting and/or rotating the blood sampling tube after the blood sampling tube is in a compressed state. 3. The blood collection tube includes a bottomed tube with one end open;
Claim 1, which comprises a sealing member that seals the opening, and whose interior is depressurized.
The blood sampling device according to item 1 or 2. 4. The blood sampling device according to claim 3, wherein the rib of the blood sampling tube is provided on the tube body. 5. The sealing member of the blood collection tube is in the form of a film having gas barrier properties and sealing properties that allow the puncture hole to be closed after the punctured hollow needle is removed. The blood sampling device according to any one of Items 1 to 4. 6. The blood sampling device according to any one of claims 1 to 5, wherein the locking portion of the blood sampling tube holder is a recess provided on the inner surface of the blood sampling tube holder. 7. The blood sampling instrument according to any one of claims 1 to 5, wherein the locking part of the blood collection tube holder is a protrusion that projects inward from the inner surface of the blood collection tube holder. 8. The blood sampling device according to any one of claims 1 to 5, wherein the locking portion of the blood sampling tube holder is a notch provided in the blood sampling tube holder.