JP4874623B2 - Blood collection holder - Google Patents

Description

  The present invention relates to a blood collection holder for connecting a blood collection needle and performing blood collection in vacuum blood collection or the like, and more particularly to a blood collection holder with an improved structure of a cylindrical main body into which a blood collection tube is inserted.

  Conventionally, in vacuum blood collection, a blood collection holder has been widely used to facilitate work. The blood collection holder has a substantially cylindrical shape, is configured such that a blood collection needle is connected to one end, and a vacuum blood collection tube can be inserted from the opening at the other end. When blood collection is performed, a blood collection needle is connected to the blood collection holder, and one end of the blood collection needle is punctured into the blood vessel. Next, a vacuum blood collection tube is inserted into the blood collection holder, and the other end of the blood collection needle, that is, a hollow needle extending into the blood collection holder is inserted into the rubber stopper of the vacuum blood collection tube. As a result, the blood vessel and the vacuum blood collection tube are connected, and blood flows into the vacuum blood collection tube under reduced pressure.

  By the way, in the vacuum blood collection needle, the needle tip of the hollow needle opposite to the side punctured by the blood vessel, that is, the needle tip pierced by the vacuum blood collection tube is covered with a rubber sleeve. Therefore, when the needle tip on the side covered with the rubber sleeve is pierced into the rubber stopper of the vacuum blood collection tube, the needle tip is pierced into the rubber stopper after the rubber sleeve is broken by the needle tip. . In this case, as the vacuum blood collection tube is inserted into the blood collection holder and advanced, that is, as the needle tip penetrates the rubber stopper and deeply enters the vacuum blood collection tube, the rubber sleeve moves to the vacuum blood collection tube that has moved. It will be compressed by the top of the rubber plug. Therefore, when the frictional force between the hollow needle penetrating the rubber stopper and the rubber stopper is larger than the elastic repulsion force of the rubber sleeve, the state where the hollow needle has penetrated the rubber stopper is reliably maintained. However, when the elastic repulsive force of the rubber sleeve is larger, the repulsive force causes a so-called kickback phenomenon in which the hollow needle comes out of the rubber stopper, thereby stopping the blood flow into the vacuum blood collection tube. was there.

For example, Patent Document 1 below discloses a blood collection holder provided with a structure for preventing the kickback as described above. This blood collection holder is provided with a structure for holding a blood collection tube with a leaf spring, thereby preventing kickback.
Japanese Patent Application Laid-Open No. 07-204180

  As described above, the conventional blood collection holder described in Patent Document 1 or the like has to be provided with a complicated structure in order to prevent kickback. For this reason, there are problems that the manufacturing cost of the blood collection holder is high and the number of parts is increased.

  Conventional blood collection holders are usually obtained by injection molding a synthetic resin. Therefore, for the convenience of processing, the inner diameter at the end portion on which the opening is provided is made larger than the top surface of the blood collection holder, that is, the surface to which the vacuum blood collection needle is connected. If the inner diameter of the opening is large, the vacuum blood collection tube may be inserted obliquely when the vacuum blood collection tube is inserted. When the vacuum blood collection tube is inserted in an oblique direction, the hollow needle cannot penetrate the rubber stopper in the correct direction at the correct position, and a large force may be required to pierce the rubber stopper. Alternatively, blood could not be collected if the hollow needle could not completely penetrate the rubber stopper.

  The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to prevent the kickback phenomenon caused by the repulsive force of the rubber sleeve on the blood collection needle side without increasing the number of parts and requiring a complicated structure. An object of the present invention is to provide a blood collection holder that can be surely prevented.

The present invention provides a blood collection holder having a tubular body having a needle joint for connecting a blood collection needle at one end and an opening at the other end, wherein at least a part of the tubular body has a length of a short diameter. However, a portion having an elliptical cross-sectional shape that is smaller than the outer diameter of the blood collection tube inserted into the blood collection holder is provided integrally with the blood collection holder, and the opening of the cylindrical body is open A protrusion is provided on the inner peripheral surface of the cylindrical main body at the end on the side .

  In the blood collection holder according to the present invention, the cross-sectional shape of the inner peripheral surface of at least a part of the cylindrical main body is an ellipse, and the length of the minor axis of the ellipse is that of the blood collection tube inserted into the blood collection holder. A portion that is smaller than the outer diameter is provided. Therefore, when a blood collection tube is inserted into the blood collection holder, the blood collection tube must be inserted so as to push and spread the elliptical short diameter portion. Therefore, after insertion, the blood collection tube is firmly held in the elliptical portion in which the length of the short diameter is smaller than the outer diameter of the blood collection tube. Therefore, even if a kickback phenomenon occurs due to the rubber sleeve on the blood collection needle side, since the blood collection tube is firmly held by the blood collection holder, the stopper of the blood collection tube does not come off from the blood collection needle. Therefore, blood collection can be continued safely and reliably.

  In particular, when the portion having an elliptical cross-sectional shape in which the length of the short axis is smaller than the outer diameter of the blood collection tube is connected to the needle joint of the cylindrical body, the blood collection needle When the hollow needle is provided at a position in the longitudinal direction of the blood collection holder corresponding to the portion inserted into the blood collection tube, in the vicinity of the portion where the hollow needle of the blood collection needle pierces the stopper of the blood collection tube, and in the vicinity thereof, The blood collection tube can be securely held on the cylindrical main body. Therefore, even if a kickback phenomenon occurs, the stopper of the blood collection tube is more difficult to come off from the vacuum blood collection needle.

  When a protrusion is provided on the inner peripheral surface of the cylindrical main body at the open end of the cylindrical main body, the inner diameter is narrowed at that portion. Therefore, when a blood collection holder having a cylindrical body is obtained by injection molding, the inner diameter of the end on the open side tends to be large, but even in that case, the blood collection tube is oriented in the central axis direction. Can be inserted along and accurately. Therefore, even if the inner diameter of the opening side is increased, it is difficult to insert in the oblique direction. Therefore, it is possible to provide a blood collection holder capable of inserting a blood collection tube in the right direction without piercing without increasing the cost of the blood collection holder by injection molding Is possible.

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

  FIG. 2A is a plan view of a blood collection holder according to one embodiment of the present invention, and FIGS. 2B and 2C are the BB line and CC in FIG. FIG.

  The blood collection holder 1 is obtained by injection molding a synthetic resin. The synthetic resin is not particularly limited, and polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, and the like can be used. It is desirable to use a flexible resin or a hard resin to reduce the wall thickness because the ellipse-shaped minor axis side is pushed in with a blood collection tube while being expanded. However, if it is opaque, it is not known whether blood is flowing into the blood collection tube, so it is desirable to be transparent or translucent.

  The blood collection holder 1 is preferably made of a synthetic resin having transparency. When it has transparency, it is preferable because the progress of blood collection inside can be easily visually confirmed from the outside.

  The blood collection holder 1 has a cylindrical main body 2. The cylindrical main body 2 has a needle joint 3 at one end. The needle joint portion 3 has a cylindrical shape with a relatively small diameter protruding from the center of the top surface 2a of the cylindrical main body 2 to the outside in the axial direction of the cylindrical main body 2. The needle joint 3 has an opening 3a for inserting the base of the vacuum blood collection needle. The inner diameter of the opening 3a is substantially equal to the outer diameter of the base of the hub of the vacuum blood collection needle described later.

  On the other hand, an opening 2b is provided at the end of the cylindrical body 2 opposite to the side where the needle joint 3 is provided. The inner diameter of the opening 2b is preferably larger than the inner diameter of the cylindrical body 2 on the top surface 2a side, thereby facilitating injection molding.

  But the internal diameter by the side of the opening part 2b of the cylindrical main body 2 does not necessarily need to be larger than the internal diameter in the top | upper surface 2a side.

The blood collection holder 1 of the present embodiment is characterized by an elliptical shape in which at least a part of the cylindrical main body 2 has a short diameter smaller than the outer diameter of the vacuum blood collection tube inserted into the blood collection holder 1. A portion having a cross-sectional shape is provided. Specifically, the vacuum blood collection needle is connected to the needle joint 3 of the blood collection holder 1, and the blood collection holder length direction corresponding to the portion where the hollow needle extending into the cylindrical body 2 of the vacuum blood collection needle is located. In the position, there is provided a portion where the minor axis is smaller than the outer diameter of the vacuum blood collection tube. This portion is indicated by arrow D in FIG. At the height position indicated by the arrow D, the cross section has an elliptical shape, and has a short diameter D1 and a long diameter D2 as schematically shown in FIG. That is, FIG. 2B is a cross-sectional view along the direction of the long diameter D2, and FIG. 2C is a cross-sectional view along the direction of the short diameter D1. And this short diameter D1 is made smaller than the outer diameter of the vacuum blood-collecting tube inserted.

  A portion indicated by an arrow D is located at a portion where the hollow needle of the vacuum blood collection needle is extended into the cylindrical main body 2.

  In the present embodiment, the short diameter D1 is smaller than the outer diameter of the vacuum blood collection tube at the portion indicated by the arrow D, and the end portion on the opening 2b side has a larger elliptical cross-sectional shape. Thus, the opening 2b side is formed.

  In the blood collection holder 1, the short diameter D1 is smaller than the outer diameter of the vacuum blood collection tube in the portion indicated by the arrow D. However, in the present invention, the short diameter is smaller than the outer diameter of the vacuum blood collection tube. May be provided over the entire length direction of the cylindrical main body 2. That is, the short diameter D1 should just be made smaller than the outer diameter of a vacuum blood collection tube in at least one part of the length direction of the cylindrical main body 2. FIG.

  In the blood collection holder 1, a plurality of protrusions 2 c are provided on the inner peripheral surface of the cylindrical main body 2. The protrusion 2c is provided on the inner peripheral surface on the opening 2b side. By providing the projection 2c, the inner diameter of the cylindrical main body 2 is narrowed at the portion where the projection 2c is provided.

  In the present embodiment, the protrusion 2c has a linear shape, and extends from the periphery of the opening 2b in the length direction of the cylindrical main body 2. However, the shape of the protrusion is such a shape. It is not limited. That is, not a straight line, but a dot-like protrusion may be provided on the inner peripheral surface of the cylindrical main body 2 in the vicinity of the opening 2b, and the number of protrusions is not particularly limited, and only one protrusion is provided. It may be provided.

  Preferably, the plurality of protrusions 2c are desirably arranged in a distributed manner on the inner peripheral surface of the cylindrical main body 2, thereby preventing rattling when a vacuum blood collection tube is inserted, as will be described later. The blood vessel can be easily inserted in the correct direction in the central axis direction of the cylindrical main body 2.

  Next, the method and effect of the blood collection holder 1 will be described.

  In order to perform vacuum blood collection using the blood collection holder 1, first, as shown in a perspective view in FIG. 1, a vacuum blood collection needle 4 is connected to the needle joint 3 of the blood collection holder 1. The vacuum blood collection needle 4 has first and second hollow needles 5 and 6, as shown in a longitudinal sectional view in FIG. As for the 1st hollow needle 5 and the 2nd hollow needle 6, the needle point is located in the length direction opposite side, and each base part is connected with the hollow flow path of the hub 7 which has a hollow flow path. And attached to the hub 7. The hollow needle 6 is initially covered with a rubber sleeve 11. The hub 7 has a base portion 7a that is press-fitted into the opening 3a of the blood collection holder 1 from which blood has been collected. The vacuum blood collection needle 4 is inserted into the opening 3 a of the blood collection holder 1 from the second hollow needle 6 side, and the base 7 a is inserted into the opening 3 a, thereby fixing the vacuum blood collection needle 4 to the blood collection holder 1. . The vacuum blood collection needle 4 and the opening 3a of the blood collection holder 1 may be fixed not by press fitting but by screwing or the like. That is, the opening 3a of the blood collection holder 1 may be provided with a female screw so that it can be screwed in accordance with the blood collection needle.

  In vacuum blood collection, the vacuum blood collection needle 4 is connected to the blood collection holder 1 and fixed, and then the needle tip of the first hollow needle 5 is inserted into the blood vessel. In this state, as shown in FIGS. 1 and 3, the vacuum blood collection tube 8 is inserted into the blood collection holder 1 from the opening 2 b side of the blood collection holder 1. The vacuum blood collection tube 8 has a bottomed tubular container body 9 and a stopper 10 press-fitted into the opening of the container body 9. The inside of the vacuum blood collection tube 8 is depressurized.

  The plug 10 is usually formed of an elastic material such as synthetic rubber, natural rubber or elastomer.

  As shown in FIG. 3, the vacuum blood collection tube 8 is inserted into the cylindrical main body 2 of the blood collection holder 1, the plug body 10 is pierced by the second hollow needle 6, and the needle tip of the second hollow needle 6 is inserted. It is located in the vacuum blood collection tube 8. As a result, since the blood vessel and the vacuum blood collection tube 8 are communicated with each other by the vacuum blood collection needle 4 and the inside of the vacuum blood collection tube 8 is decompressed, the blood is guided into the vacuum blood collection tube 8 and blood collection is performed.

  Incidentally, the vacuum blood collection needle 4 has the rubber sleeve 11 as described above. The rubber sleeve 11 is broken by the needle tip of the second hollow needle 6 when the vacuum blood collection tube 8 is inserted, and the rubber sleeve 11 is shown in FIG. 3 as the vacuum blood collection tube 8 is inserted into the cylindrical main body 2. Compressed as it is. That is, the rubber sleeve 11 is compressed between the inner surface of the top surface 2 a of the cylindrical main body 2 or the lower surface of the base portion 7 a of the vacuum blood collection needle 4 and the stopper 10.

  When the rubber sleeve 11 is compressed, the above-described kickback phenomenon tends to occur due to the elastic repulsion force. That is, there is a possibility that the plug body 10 is pushed downward by the elastic repulsive force of the rubber sleeve 11 from the state shown in FIG. 3, and the second hollow needle 6 is detached from the plug body 10 or blood collection is stopped. On the other hand, in the blood collection holder 1 of the present embodiment, as described above, the second hollow needle 6 is a cylinder in the portion indicated by the arrow D, that is, as shown in FIG. In a part of the longitudinal position located in the cylindrical main body 2, the cross-sectional shape of the cylindrical main body 2 is an ellipse having a short diameter D1. Therefore, in the blood collection state shown in FIG. 3, the vacuum blood collection tube 8, particularly the plug body 10, is securely held by the cylindrical body 2 in the portion indicated by the arrow D. In other words, when the vacuum blood collection tube 8 passes through the portion indicated by the arrow D when the vacuum blood collection tube 8 is inserted into the tubular main body 2, the portion indicated by the arrow D is expanded, that is, the cylindrical main body 2. The vacuum blood collection tube 8 cannot be positioned in the blood collection state shown in FIG. 3 unless the vacuum blood collection tube 8 is inserted so as to expand the elliptical portion of the minor axis D1.

  When the vacuum blood collection tube 8 is inserted so as to expand the short diameter D1 in this manner, the cross-sectional shape of the portion indicated by the arrow D is deformed, but in the short diameter direction portion of D1, a vacuum is formed. A large compressive stress is applied to the blood collection tube 8, particularly the plug 10 of the vacuum blood collection tube 8, and the vacuum blood collection tube 8 is firmly fixed and held on the cylindrical main body 2.

  Therefore, even if the elastic repulsion force of the rubber sleeve 11 described above is applied, the second hollow needle 6 is not easily detached from the plug body 10 because the plug body 10 is firmly fixed and held on the cylindrical body 2.

  Therefore, an accident such as stop of blood collection due to the kickback phenomenon can be surely prevented, and blood collection can be continued and terminated safely and stably.

In this embodiment, the vacuum blood collection tube 8 inserted in the blood collection holder 1 has the stopper 10, but instead of the stopper 10, the opening of the bottomed tubular container body 9 is made of aluminum foil or the like. A sealed vacuum blood collection tube may be used. And the part firmly hold | maintained by the short diameter D1 is not restricted to the stopper 10, but may be a part of the container main body 9.

  That is, a portion having a short diameter D1 smaller than the outer diameter of the vacuum blood collection tube 8 is provided at a position in the longitudinal direction of the blood collection holder corresponding to a portion where the hollow needle 6 is extended into the cylindrical main body 2 at the time of vacuum blood collection. As far as possible, the structure of the vacuum blood collection tube to be applied is not limited to the vacuum blood collection tube 8 used in the above embodiment.

  The reason why the cross-sectional shape of the portion indicated by the arrow D is elliptical is that in the case of the elliptical shape, a large compressive stress is applied in the radial direction to the vacuum blood collection tube 8 in the portion of the short diameter D1. Although it can be held and fixed, as a premise, when the vacuum blood collection tube 8 is inserted, in order to deform the cylindrical main body 2 as described above, it is desirable to have an elliptical shape having a short diameter and a long diameter. by. That is, when the circular cross-sectional shape having a diameter smaller than the outer diameter of the vacuum blood collection tube 8 is simply used, the above-described deformation hardly occurs. Therefore, in the present invention, an elliptical portion having a minor axis D1 and a major axis D2 is used.

  Moreover, in the blood collection holder 1 of the said embodiment, the several protrusion 2c mentioned above is provided. Therefore, since the inner diameter is reduced in the portion where the projection 2c is provided, the vacuum blood collection tube 8 can be correctly and easily inserted in the axial direction of the cylindrical body 2 as shown in FIG. .

  And when the said protrusion is not provided, as shown in FIG. 4, when the diameter by the side of the opening part 2b is larger than the outer diameter of the vacuum blood-collecting tube 9, the vacuum blood-collecting tube 9 is diagonally directed to the cylindrical main body 2. May be inserted. Therefore, there is a possibility that the second hollow needle of the vacuum blood collection needle 4 is not reliably pierced through the plug body 10, or in some cases, a large force is required to allow the plug body 10 to pierce the hollow needle. .

  On the other hand, in the blood collection holder 1 of the above embodiment, since the plurality of protrusions 2c are provided, the vacuum blood collection tube 8 can be easily and surely inserted into the cylindrical main body 2 in the correct direction.

  The specific dimension of the minor axis D1 in the cross section of the portion indicated by the arrow D is appropriately stored depending on the vacuum blood collection tube 8. For example, the vacuum sampling in which the maximum outer diameter portion of the plug 10 is 17.6 mm. When the blood vessel 8 is used, the short diameter D1 may be smaller than 17.6 mm, for example, about 17.0 mm. Regarding the degree to which the short diameter D1 is made smaller than the outer diameter of the vacuum blood collection tube 8, a member located at the maximum outer diameter portion of the vacuum blood collection tube 8, particularly the portion where the second hollow needle 6 is inserted, for example, a plug body Since it differs depending on the material of 10 or the material constituting the cylindrical main body 2 of the blood collection holder 1 and the wall thickness, it is not uniquely determined.

  Further, when the short diameter D1 is 17.0 mm, the long diameter D2 is not limited, but may be, for example, about 18 mm to 20 mm. The dimension of the major axis D2 may be selected as appropriate so as to enable deformation such that the part of the minor axis D1 is expanded.

  According to the inventor of the present application, when a vacuum blood collection tube having an outer diameter of 17.6 mm is inserted, when the short diameter D1 of the blood collection holder 1 is 17.0 mm and the long diameter D2 is 18.7 mm, the plug 11 The frictional force between the cylindrical main body 2 was about 800 g. In contrast, the elastic repulsion force of the rubber sleeve 14 of the vacuum blood collection needle 4 was about 300 g in the case of vacuum blood collection tubes of the same size. Therefore, as is clear from the numerical values of the frictional force and the elastic repulsion force, as described above, it can be seen that kickback due to the elastic repulsion force of the rubber sleeve can be surely prevented.

The perspective view explaining the process of performing vacuum blood collection using the blood collection holder of one Embodiment of this invention. (A) is a top view of the blood collection holder which concerns on one Embodiment of this invention, (b), (c) is sectional drawing which follows the BB line and CC line in (a). (D) is a figure which shows schematically the elliptical cross-sectional shape of a cylindrical main body. The longitudinal cross-sectional view which shows the state which mounted | wore the blood collection holder which concerns on one Embodiment of this invention with the vacuum blood collection needle and the vacuum blood collection tube. The typical front sectional view for explaining the case where a vacuum blood collection tube is inserted into the blood collection holder in the slanting direction when the projection is not provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Blood collection holder 2 ... Cylindrical main body 2a ... Top surface 2b ... Opening part 2c ... Protrusion 3 ... Needle joint part 3a ... Opening 4 ... Vacuum blood collection needle 5 ... 1st hollow needle 6 ... 2nd hollow needle 7 ... Hub 7a ... Base 8 ... Vacuum blood collection tube 9 ... Container body 10 ... Plug body 11 ... Rubber sleeve D ... Portion where the short diameter D1 is smaller than the outer diameter of the blood collection tube D1 ... Short diameter D2 ... Long diameter

Claims (1)

In a blood collection holder having a tubular body with a needle joint for connecting a blood collection needle at one end and an opening at the other end,
A portion having an elliptical cross-sectional shape in which at least a part of the short diameter of the cylindrical main body is smaller than the outer diameter of the blood collection tube inserted into the blood collection holder is provided integrally with the blood collection holder. It is and,
A blood collection holder , wherein a protrusion is provided on an inner peripheral surface of the cylindrical main body at an end of the cylindrical main body on the opening side .

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