JP6295059B2 - Indwelling needle - Google Patents

Description

  The present invention relates to an indwelling needle that includes an outer needle and an outer needle base and is used for infusion to a patient.

  Conventionally, an indwelling needle that includes an outer needle and an outer needle base and is provided with a female connector at a rear end portion of the outer needle base is known (see, for example, Patent Documents 1 to 3). Such an indwelling needle is inserted into the outer needle, guided by the inner needle and punctured into the patient's blood vessel or the like, and then the inner needle is removed and placed in the blood vessel or the like. Then, an infusion line or the like is connected to the indwelling indwelling needle through a female connector of the outer needle base.

  The indwelling needle of Patent Literature 1 is provided with a tube-shaped connecting portion that is in communication with an outer needle and is located in a female connector and has a rear end that is open. The tubular connection portion has a hemostasis valve that can be elastically deformed in the female connector. The hemostasis valve includes a cylindrical portion that elastically deforms forward and contracts when pressed by the male connector. The rear end portion of the cylindrical portion is formed with a slit that closes the rear end opening of the outer needle and is pushed and widened by the inner needle to allow the inner needle to be inserted therethrough.

  When indwelling the indwelling needle, the indwelling needle with the inner needle fixed to the inner needle hub inserted into the patient's blood vessel, etc., and after confirming flashback from the inner needle to the inner needle hub, the inner needle is removed. Is done. As a result, the slit is closed, so that blood does not leak. Thereafter, when infusion or blood collection is started, the male connector is connected to the female connector. At this time, the cylindrical portion of the hemostasis valve is elastically deformed by the male connector and the slit is pushed and widened, so that the connection from the male connector to the outer needle is performed without any trouble.

  The indwelling needle of Patent Document 2 includes a hemostasis valve by a slit disposed in the middle abdomen in the outer needle base, and a pusher slidably disposed in the outer needle base for opening and closing the hemostasis valve. Prepare. A conical reduced diameter lumen exists between the outer needle and the hemostasis valve.

  Also in this case, the indwelling needle is punctured using the inner needle in the same manner as in Patent Document 1, and then the inner needle is removed and placed. Thereafter, when the male connector is connected, the pusher slides by being pushed by the male connector. Then, the slit is pushed open by the pusher, and the distal end portion of the pusher projects into the above-mentioned reduced diameter lumen. Thereby, an outer needle and a male connector are connected via a pusher.

  Similar to Patent Document 2, the indwelling needle of Patent Document 3 includes a hemostasis valve and a pusher. Then, as in the case of Patent Document 2, puncturing using the inner needle, removal of the inner needle, and connection of the male connector are performed.

JP 2004-242663 A JP 2002-263197 A Special table 2012-517326 gazette

  However, according to the indwelling needle of Patent Document 1, it is possible to easily open the slit of the hemostasis valve by simply inserting the male connector into the female connector, but the hemostasis valve covers the rear end portion of the outer needle. Is arranged. For this reason, after the inner needle is removed and before the male connector is connected, the space where the blood that flows backward is accumulated is only in the outer needle and is extremely small. For this reason, it is difficult to confirm the backflow of blood particularly when the diameter of the outer needle is small.

  On the other hand, according to the indwelling needle of Patent Document 2, between the outer needle and the hemostasis valve, there is a reduced-diameter lumen that narrows conically from the outer diameter of the hemostasis valve to the outer diameter of the outer needle. The backflow of blood is easy to confirm. However, when the male connector is connected, the distal end of the pusher protrudes into the reduced-diameter lumen, so that retention occurs around the distal end. In the portion where the stagnation occurs, there is little or no fluid flow. In addition, there is a possibility that stagnation also occurs in the space between the pusher and the outer needle base.

  Where such retention occurs, blood and chemicals are likely to coagulate and condense. For this reason, it is necessary to avoid the occurrence of stagnation as much as possible. In addition, after the inner needle is removed, there is a possibility that a lump of air may remain at the staying place.

  In order to prevent the occurrence of the stay as described above, a flow deflector or a flow path for generating a flow of a chemical or the like is provided in a place where the stay is likely to occur as in the case of the indwelling needle of Patent Document 3. There is a need. Further, in order to prevent the air mass from remaining in the staying portion, as in the case of the indwelling needle disclosed in Patent Document 3, the air flow is allowed to flow on the outer peripheral surface of the partition wall, but the flow of the liquid is prevented. It is necessary to provide a groove. However, in that case, the structure of the partition and the pusher becomes complicated.

  An object of the present invention is to provide an indwelling needle having a simple structure that can supply a chemical solution without stagnation and can easily check a backflow of blood.

The indwelling needle of the present invention is provided with an outer needle through which an inner needle can be inserted, an outer needle holding portion for holding the outer needle at a front end portion, and a female connector leading to the outer needle at a rear end portion, An outer needle base provided with a cylindrical space between the front end portion and the rear end portion, and a cylindrical shape in which both ends are released, the front end side has a larger outer diameter than the rear end side, and the front end side is the cylinder Fixed to the front end side of the cylindrical space, and the front end side is connected to the outer needle, and is fitted to the inner wall of the cylindrical space, and a chamber portion in which a large diameter space larger than the inner diameter of the outer needle is provided. And is movable in the axial direction between the first position and the second position ahead of the first position, and is provided so that the rear end side is exposed in the female connector at both movement positions. There has freed tubular form, the partition wall with a slit valve that separates the internal space in the axial direction is provided, behind the partition wall The inner circumferential surface in contact with the liquid-tight on the outer peripheral surface of the rear end side is provided when the rear end side of the chamber portion is pushed open the slit valve, the rear end, the male to the female connector A rubber plug portion provided with a rear end surface in liquid-tight contact with the front end surface of the male connector when the connector is connected, and the outer needle base, the chamber portion, and the rubber plug portion include the rubber plug portion. When located at the first position, the rear end of the chamber portion is in contact with the partition wall, and when the male connector is connected to the female connector in this state, the rubber plug portion is pushed by the male connector, The rear end side of the chamber part moves to the second position and is configured to push open the slit valve.

  In the present invention, when the indwelling needle is indwelled, the indwelling needle inserted into the outer needle through the slit valve is punctured into the patient's blood vessel or the like, and the inner needle is removed. Thereafter, when the male connector is connected to the female connector for blood transfusion or chemical supply, the rear end side of the chamber portion pushes the slit valve open as described above. As a result, a liquid-tight flow path is formed from the male connector to the outer needle through the portion on the front end side of the partition wall of the rubber plug portion and the chamber portion.

  At this time, since the rubber plug portion and the chamber portion are connected by pushing open the slit valve of the rubber plug portion on the rear end side of the chamber portion, the tip portion of the pusher pushes the slit valve open as in the prior art, It does not protrude into the reduced diameter lumen portion (corresponding to the large diameter space of the chamber portion). Further, the male connector and the chamber part are liquid-tightly connected via a rubber plug part.

  For this reason, the flow path from the male connector to the outer needle can be easily formed as a liquid-tight one without stagnation, without the need to provide a flow deflector or an escape channel for removing the stagnation part as in the prior art. Can do. Therefore, according to the present invention, it is possible to provide an indwelling needle having a simple structure capable of supplying a chemical solution without retention.

  In the present invention, the chamber part and the outer needle group may have a transparent part for visually confirming the backflow of blood into the chamber part. According to this, coupled with the fact that the large-diameter space is provided in the chamber part, it is possible to easily visually check the backflow of blood to the chamber part.

  In the present invention, the rear end portion of the chamber portion is provided with a groove that communicates the inside and the outside of the chamber portion when the rear end of the chamber portion is in contact with the partition wall, and the outer needle base and Between the rubber plug portion, there is a gap through which the air flowing out of the chamber portion through the groove flows out to the female connector side when the rear end of the chamber portion is in contact with the partition wall. It may be provided.

  According to this, when the indwelling needle is punctured into a patient's blood vessel or the like, and then the inner needle is removed, the rear end of the chamber portion and the partition wall of the rubber plug portion are in contact with each other. However, since the air in the chamber part can flow out of the chamber part by the groove at the rear end part of the chamber part, the backflow of blood to the chamber part is promoted. The degree of promotion can then be controlled by selecting the groove dimensions. Therefore, the backflow of blood into the chamber portion can be quickly generated and confirmed.

  In the present invention, the chamber portion includes a flange portion at a rear end portion that pushes the partition when the rubber plug portion is pushed by the male connector and moves to the second position, and the rubber plug portion The front end portion may include an annular convex portion that protrudes toward the inner surface side and engages with the flange portion to position the rubber plug portion at the first position.

  According to this, since it is not necessary to provide the convex part for positioning a rubber stopper part in a 1st position in an outer needle base, the structure of an outer needle base can be simplified.

It is a perspective view of an indwelling needle concerning one embodiment of the present invention. It is the exploded view which showed each part of the indwelling needle of FIG. 1 in the cross section. (A) is a front view of the rubber stopper part of the indwelling needle of FIG. 1, (b) is the side view. (A) is a front view of the chamber part of the indwelling needle of FIG. 1, (b) is the side view. It is sectional drawing which shows that the rear end of a chamber part contacts the partition of a rubber stopper part when the rubber stopper part of the indwelling needle of FIG. 1 is located in a 1st position. FIG. 2 is a cross-sectional view showing that when a male luer is connected to a female luer in the indwelling needle of FIG. 1, the rubber plug portion moves to a second position and a flow path from the male luer to the outer needle is established. It is sectional drawing of the indwelling needle which concerns on another embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the indwelling needle 1 of the embodiment is attached to the inside of the outer needle 2, the outer needle base 4 that holds the outer needle 2 by the outer needle holding portion 3 at the front end, and the outer needle base 4. A rubber plug portion 5 and a chamber portion 6 attached between the rubber plug portion 5 and the outer needle 2 inside the outer needle base 4. In FIG. 1, the outer needle base 4 is displayed as being transparent.

  The rear end portion of the outer needle base 4 constitutes a female luer 7 as a female connector that communicates with the outer needle 2. A cylindrical space 8 is formed between the front end portion and the rear end portion of the outer needle base 4. The outer needle base 4 is formed of a transparent plastic.

  A plurality of convex portions 9 for restricting the axial position of the rubber plug portion 5 are provided at regular intervals in the circumferential direction at a portion adjacent to the cylindrical space 8 on the inner surface of the female luer 7. A plurality of convex portions 10 for fixing the chamber portion 6 are provided at regular intervals in the circumferential direction at an intermediate portion in the axial direction of the inner wall of the outer needle base 4 constituting the cylindrical space 8.

  At the front end in the axial direction of the inner wall of the outer needle base 4 constituting the cylindrical space 8, an annular convex portion 11 for fixing the chamber portion 6 is provided. In a portion adjacent to the front end side of the annular convex portion 11, a conical space 12 is formed which has a conical diameter and reaches the opening of the rear end portion of the outer needle 2. On the outer periphery of the rear end portion of the female luer 7, a male screw 13 for fixing a male luer connected to the female luer 7 is provided.

  An annular convex portion 14 having a diameter larger than the other portions of the rubber plug portion 5 is provided at the front end portion of the rubber plug portion 5. The rubber plug portion 5 can move in the axial direction between the second front position and the first rear position by sliding the annular convex portion 14 into the inner wall of the cylindrical space 8. Is provided.

  The first position is a position where the annular convex part 14 abuts against the convex part 9, and the second position is a position where the annular convex part 14 abuts against the convex part 10. The rubber stopper 5 is exposed in the female luer 7 at any position from the first position to the second position.

  Moreover, as shown in FIG. 2, the rubber stopper 5 has a hollow cylindrical shape. As shown in FIG. 3, a partition wall 16 with a slit valve 15 that partitions the space in the axial direction is provided inside the rubber plug portion 5. As a material of the rubber plug portion 5, for example, transparent or opaque rubber or elastomer can be used.

  The inner surface of the rubber plug portion 5 on the rear side of the partition wall 16 is in liquid-tight contact with the outer surface of the rear end side when the rear end side of the chamber portion 6 pushes the slit valve 15 open. Further, the rear end surface of the rubber plug portion 5 comes into liquid-tight contact with the front end surface of the male luer when the male luer is connected to the female luer 7. Thereby, the liquid-tight connection via the rubber plug part 5 of the chamber part 6 and the male luer is possible.

  The chamber part 6 is hollow with both ends opened, and is formed of a transparent plastic. As shown in FIG. 4, the chamber portion 6 includes a large-diameter portion 17 on the front end side and a small-diameter portion 18 on the rear end side. A flange portion 21 having an outer slope 19 and a steeper inner slope 20 like a caldera is formed at the rear end portion of the small diameter portion 18. The cross-sectional shape of the surface including the central axis of the flange portion 21 has an arrowhead-like shape with a turn on the outer slope 19 side.

  The outer slope 19 of the flange portion 21 is provided with a groove 22 that communicates the inside and the outside of the chamber portion 6 when the rear end of the flange portion 21 is in contact with the partition wall 16 of the rubber plug portion 5. For example, the groove 22 is provided along the outer slope 19 and is opened on the inner slope 20. For example, six grooves 22 are provided at equal intervals in the circumferential direction.

  Thereby, it is comprised so that air can flow out from the inner side of the chamber part 6 to the outer side of an outer needle base through the groove | channel 22 and the clearance gap between the outer needle base 4 and the rubber stopper part 5. FIG. As shown in FIG. 2, a large-diameter space 23 that communicates with the outer needle 2 and has a diameter larger than the inner diameter of the outer needle 2 is provided on the front end side inside the chamber portion 6.

  As shown in FIG. 1, the chamber portion 6 is attached to the outer needle base 4 by inserting the large-diameter portion 17 of the chamber portion 6 into the cylindrical space 8 of the outer needle base 4 and the annular convex portion 11 (see FIG. 2). ) And the convex portion 10. As shown in FIG. 5, the rear end of the chamber portion 6 contacts the partition wall 16 of the rubber plug portion 5 when the rubber plug portion 5 is located at the first position.

  As shown in FIG. 6, when the male luer 24 as a male connector is connected to the female luer 7 in this state, the rubber plug portion 5 is pushed by the male luer 24 and moves to the second position, and the chamber portion 6 The flange portion 21 pushes open the slit valve 15 (see FIG. 3) and protrudes rearward of the partition wall 16.

  Thereby, the rear end portion of the chamber portion 6 including the flange portion 21 is in close contact with the inner surface of the rubber plug portion 5 on the rear side of the partition wall 16. At this time, the rear end surface of the rubber plug portion 5 and the front end surface of the male luer 24 are in liquid-tight contact. Accordingly, a liquid-tight flow path from the male luer 24 to the outer needle 2 through the front end side of the rubber plug portion 5 and the chamber portion 6 is formed.

  Note that the flange portion 21 protruding rearward of the partition wall 16 cooperates with the partition wall 16 to prevent the rubber plug portion 28 from being returned to the first position. Thereby, it can prevent that the rubber stopper part 5 is returned to the 1st position, and the indwelling needle 1 is used again.

  In this configuration, when an infusion such as a drug solution is performed using the indwelling needle 1, the indwelling needle 1 with an inner needle (not shown) protruding from the outer needle 2 is punctured into a patient's blood vessel or the like. The Next, when the flashback through the inner needle is confirmed, the inner needle is removed. The blood flowing back through the outer needle 2 accumulates in the chamber portion 6 after the inner needle is removed from the middle.

  The practitioner can visually recognize this state through the transparent outer needle base 4 and the constituent members of the chamber portion 6. At this time, since the rubber plug portion 5 is located at the first position, the flange portion 21 at the rear end of the chamber portion 6 is in contact with the partition wall 16 of the rubber plug portion 5.

  For this reason, the air in the chamber part 6 flows out to the outside of the chamber part 6 only through the groove 22 of the flange part 21, and further to the outside through a gap between the rubber plug part 5 and the outer needle base 4. leak. Therefore, the inflow speed of blood flowing into the chamber portion 6 is controlled according to the dimension of the groove 22. Accordingly, by appropriately selecting the dimension of the groove 22, the blood backflow into the chamber portion 6 can be achieved at an appropriate speed.

  When the inflow of blood into the chamber portion 6 is confirmed, the male luer 24 is screwed into the male screw 13 of the female luer 7 for infusion or the like as shown in FIG. Connected to. At this time, the rubber plug portion 5 is pushed by the male luer 24 to move from the first position to the second position. Thereby, the slit valve 15 of the rubber plug portion 5 is pushed open by the flange portion 21 of the chamber portion 6, and the rear end portion of the chamber portion 6 protrudes rearward of the partition wall 16 of the rubber plug portion 5.

  Thereby, a liquid-tight flow path from the male luer 24 to the outer needle 2 through the rear end side of the rubber plug portion 5 and the chamber portion 6 is established. In the established flow path, there is no staying portion deviating from the flow of the infusion solution, so that the stagnation or excessive concentration of the infusion solution does not occur. For this reason, the flush operation in the flow path is also reliably performed.

  As described above, according to the present embodiment, since the chamber portion 6 having the large-diameter space 23 having a diameter larger than the inner diameter of the outer needle 2 is provided, the backflow of blood generated in accordance with the removal of the inner needle can be easily performed. Can be confirmed. Further, the male luer 24 and the chamber portion 6 are connected in a liquid-tight state via the rubber plug portion 5, and the pusher has a reduced diameter lumen portion (corresponding to the large diameter space 23 of the chamber portion 6) as in the prior art. Therefore, it is possible to easily establish a flow path without residence from the male luer 24 to the outer needle 2.

  Further, since the rear end portion of the chamber portion 6 is provided with a groove 22 that communicates the inside and the outside of the chamber portion 6 when the rear end of the chamber portion 6 is in contact with the partition wall 16 of the rubber plug portion 5. The backflow of blood to the chamber part 6 can be generated and confirmed at an appropriate speed.

  FIG. 7 shows another embodiment of the indwelling needle 1. In this indwelling needle 1, an outer needle base 26 having no convex portion 9 is used in place of the outer needle base 4 described above. Moreover, it replaces with the above-mentioned rubber plug part 5, and the rubber plug part 28 which has the cyclic | annular convex part 27 which protruded to the inner surface side instead of the cyclic | annular convex part 14 at the front end part is used.

  The annular convex portion 27 pushes the front end side of the rubber plug portion 28 against the flange portion 21 of the chamber portion 6 so as to get over the flange portion 21 and engage with the flange portion 21, and the rear end of the flange portion 21 is rubber. It is comprised so that the partition 16 of the stopper part 28 may be contact | connected.

  Therefore, the first position of the rubber plug portion 28 is defined by the flange portion 21. For this reason, since it is not necessary to provide the outer needle base 26 with a convex portion such as the convex portion 9 in the outer needle base 4, the outer needle base 26 can be configured easily. Other configurations and operations are the same as those in the embodiment shown in FIGS.

  In addition, this invention is not limited to said embodiment. For example, in the above-described embodiment, the large-diameter portion 17 and the outer needle base 4 of the chamber portion 6 are made of different materials, but instead of this, they may be integrally made of the same material. Good.

  DESCRIPTION OF SYMBOLS 1 ... Indwelling needle, 2 ... Outer needle, 3 ... Outer needle holding part, 7 ... Female luer (female connector), 8 ... Cylindrical space 4, 26 ... Outer needle base 5, 28 ... Rubber plug part, 6 ... Chamber , 15 ... slit valve, 16 ... partition, 21 ... flange, 22 ... groove, 23 ... large-diameter space, 24 ... male luer (male connector), 27 ... annular convex part.

Claims (4)

An outer needle through which the inner needle can be inserted;
An outer needle holding portion for holding the outer needle is provided at a front end portion, a female connector communicating with the outer needle is provided at a rear end portion, and a cylindrical space is provided between the front end portion and the rear end portion. An outer needle base,
The cylinder is open at both ends, the front end side has a larger outer diameter than the rear end side, the front end side is fixed to the front end side of the cylindrical space, the front end side communicates with the outer needle, A chamber portion in which a large-diameter space having a diameter larger than the inner diameter of the outer needle is provided;
Fits into the inner wall of the cylindrical space and can move in the axial direction between a first position and a second position ahead of the first position, and the rear end side is inside the female connector at any movement position. A partition wall with a slit valve for partitioning the inner space in the axial direction is provided, and is provided behind the partition wall . rear side inner peripheral surface in contact with the liquid-tight on the outer peripheral surface of the rear end side is provided when the push open the slit valve, the rear end, when the male connector is connected to the female connector A rubber plug portion provided with a rear end surface in liquid-tight contact with the front end surface of the male connector;
The outer needle base, the chamber portion, and the rubber plug portion are configured such that when the rubber plug portion is located at the first position, a rear end of the chamber portion is in contact with the partition wall, and in this state, the female connector is connected to the female connector. The rubber plug portion is pushed by the male connector to move to the second position and the rear end side of the chamber portion is configured to push open the slit valve. Indwelling needle.   The indwelling needle according to claim 1, wherein the chamber part and the outer needle base have a transparent part for visually confirming a backflow of blood into the chamber part. The rear end portion of the chamber portion is provided with a groove that communicates the inside and the outside of the chamber portion when the rear end of the chamber portion is in contact with the partition wall,
Between the outer needle base and the rubber plug portion, when the rear end of the chamber portion is in contact with the partition wall, air that flows out of the chamber portion through the groove is on the female connector side. The indwelling needle according to claim 1, wherein a gap is provided to flow out of the indwelling needle. The chamber portion includes a flange portion at a rear end portion that pushes the partition when the rubber plug portion is pushed by the male connector and moves to the second position.
The said rubber stopper part is provided with the cyclic | annular convex part which protrudes to an inner surface side at the front-end part, and positions this rubber stopper part in the said 1st position by engaging with the said flange part. The indwelling needle of any one of these.