JP5637350B2 - Needle device - Google Patents

Description

  The present invention relates to a needle device including an inner hub in which a needle is integrated in a cylindrical main body.

  For example, an indwelling needle device is known as a medical needle device. The indwelling needle device is used for infusion and blood transfusion. In the indwelling needle device, there is a device in which a needle portion is projected from the tip of a cylindrical main body, and this needle portion has a double structure with a soft outer needle and a hard inner needle (see Patent Documents 1 and 2). .

  In such an indwelling needle device, a soft outer needle can be punctured together with a hard inner needle by puncturing a patient's arm or the like with a hard inner needle protruding from a soft outer needle. Furthermore, by pulling the hard inner needle into the cylindrical body, only the soft outer needle can be placed in the puncture part, and even when the patient moves, the pain of the puncture part can be relieved, Blood vessel damage can also be prevented.

  On the other hand, the hard inner needle is integrated with the inner hub to which the tube is connected. When the hard inner needle is pulled into the cylindrical main body, the inner hub is moved, and the hard inner needle is pulled into the cylindrical main body together with the inner hub.

  In the indwelling needle device as described above, a chemical solution or the like to be administered to a patient is supplied from a tube connected to the inner hub into the inner hub, and then passed through the soft outer needle through the inner hub to be administered to the patient. Become. If there is air in the indwelling needle device at the time of administration of the drug solution or the like, the air enters the blood vessel together with the drug solution or the like.

  For this reason, prior to puncturing, an operation called priming is performed in which the indwelling needle device is filled with a liquid such as physiological saline or nutrients in advance.

JP 2006-297062 A Republished WO2007 / 083770

  However, in the configuration of the conventional indwelling needle device as described above, it may be difficult to discharge the air bubbles in the indwelling needle device even if the priming operation is performed. This is because the liquid injected into the indwelling needle device is discharged through the inner hub. Specifically, the injected liquid once flows into the inner hub, flows out from a hole formed in the inner hub, passes through a gap between the outer peripheral surface of the inner hub and the cylindrical main body, and then enters the inner needle. It will lead to. In this case, there was a case where the liquid did not sufficiently spread to the outer peripheral surface of the inner hub, and bubbles remained on the outer peripheral surface of the inner hub.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a needle device that can prevent air bubbles from staying on the outer peripheral surface of the inner hub.

In order to achieve the above object, a needle device according to the present invention includes an inner hub having a needle attached to a distal end thereof, and a cylindrical main body in which the inner hub is accommodated, wherein the inner hub is the inner hub. a through hole penetrating in the radial direction of the front saw including a projection which projects from the outer peripheral surface of the Kenai hub, the projection is on the distal side of the position of said hub with respect to the opening of the through hole, the protrusion The rear wall surface is arranged so as to face the opening of the through hole .

  According to the present invention, it is possible to prevent air bubbles from staying on the outer peripheral surface of the inner hub.

The external appearance perspective view of the indwelling needle apparatus 1 which concerns on one embodiment of this invention. Sectional drawing of the longitudinal direction of the indwelling needle apparatus 1 shown in FIG. The enlarged view of the front end side of the indwelling needle apparatus 1 shown in FIG. FIG. 3 is a cross-sectional view showing a state in which an inner needle 8 is pulled into the shield tube 4 from the state of FIG. 2. It is an expanded sectional view of the inner hub 9 vicinity which concerns on one embodiment of this invention, and is an expanded sectional view in the axial direction of the through-hole 22 of the inner hub 9. FIG. FIG. 3 is an enlarged sectional view in the vicinity of an inner hub 9 according to an embodiment of the present invention, and an enlarged sectional view in the radial direction of a through hole 22 of the inner hub 9. The expansion perspective view of the inner hub 9 which concerns on one embodiment of this invention. The expansion perspective view of the inner hub 100 which concerns on a comparative example. The expansion perspective view of the inner hub 40 which concerns on another embodiment of this invention.

  According to the present invention, since the protrusion is formed on the inner hub, the liquid flowing out from the opening of the through hole formed in the inner hub is diverted to both sides of the protrusion, and the flow proceeding in the circumferential direction of the inner hub is promoted. Can do. This facilitates the discharge of bubbles in the circumferential direction of the inner hub. That is, according to the present invention, the filling of the liquid by the priming operation ensures the replacement of the air and the liquid and can prevent the bubbles from staying on the outer peripheral surface of the inner hub.

  In the needle device of the present invention, it is preferable that the inner hub is provided with a recessed portion in which an outer peripheral surface of the inner hub is recessed, and the protrusion protrudes from the recessed portion. According to this configuration, the protrusion can be formed while maintaining the outer diameter of the inner hub.

  Further, it is preferable that the protrusion is arranged so as to guide the liquid flowing out from the opening of the through hole in the circumferential direction of the inner hub.

  Moreover, it is preferable that the wall surface of the protrusion and the opening of the through hole face each other when the protrusion is viewed in plan. According to this configuration, the flow of the liquid flowing out from the through hole is regulated by the wall surface of the protrusion, and a flow that is divided on both sides of the protrusion is generated, and the flow of the liquid traveling in the circumferential direction of the inner hub can be promoted.

  In the circumferential direction of the inner hub, the opening of the through hole is preferably sandwiched between the recesses. According to this configuration, the recess serves as a groove for guiding the liquid flow in the circumferential direction of the inner hub, which is advantageous for promoting the flow of the liquid traveling in the circumferential direction of the inner hub.

  Further, when the inner hub is viewed in plan, on the central axis of the inner hub, the dimension of the gap between the protrusion and the opening of the through hole is such that the opening of the through hole and the tip of the inner hub are It is preferable that it is 1/2 or less of the shortest distance between. According to this configuration, the liquid easily spreads in the circumferential direction of the inner hub at the position where the through hole of the inner hub is formed, which is advantageous for discharging bubbles.

  Further, it is preferable that when the projection is viewed in plan, the side surfaces on both sides of the projection are arranged in a substantially V shape, and the width of the projection increases toward the through hole. According to this configuration, since the tip of the protrusion has a sharp shape, it is possible to prevent bubbles from staying at the tip of the protrusion.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The present invention relates to a needle device, and in the following embodiments, the needle device will be described as an example of a medical indwelling needle device in which a needle portion has a double structure of an outer needle and an inner needle. Such an indwelling needle device is used for infusion or blood transfusion, and can perform infusion or blood transfusion in a state where only a soft outer needle is indwelled at the puncture portion.

  FIG. 1 is an external perspective view of an indwelling needle device 1 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the indwelling needle device 1 shown in FIG. FIG. 3 is an enlarged view of the distal end side of the indwelling needle device 1 shown in FIG. 4 is a cross-sectional view showing a state in which the inner needle 8 is drawn into the shield tube 4 from the state of FIG. First, the basic configuration of the indwelling needle device 1 will be described with reference to FIGS.

  1 and 2, the indwelling needle device 1 has a cylindrical main body 2 with an outer hub 5 attached to the tip of a shield tube 4. A needle portion 3 (FIG. 2) is provided on the distal end side of the main body 2. In the state of FIG. 1, a cap 6 is attached to the needle portion 3. Examples of the material of the shield tube 4 and the outer hub 5 include polycarbonate and polypropylene.

  As shown in FIG. 3, the needle portion 3 has a double structure in which a metal hard inner needle 8 is inserted into a hollow portion of a tube-shaped soft outer needle 7. The outer needle 7 is fixed to the outer hub 5, and the inner needle 8 is fixed to the inner hub 9. Examples of the material of the inner hub 9 include polycarbonate and polypropylene. Examples of the material of the outer needle 7 include fluorine resins such as polyurethane elastomers and polytetrafluoroethylene.

  As shown in FIG. 2, the inner hub 9 is housed in the main body 2, and can move in the shield tube 4 in the axial direction of the shield tube 4. An O-ring 15 for sealing is attached to the inner hub 9. The tube 10 is connected to the tubular portion 20 on the rear end side of the inner hub 9 (see FIG. 5). By pulling the tube 10 in the direction of arrow a, the inner hub 9 moves in the shield cylinder 4 in the direction of arrow a. As a result, the inner needle 8 integrated with the inner hub 9 is drawn into the shield tube 4 as shown in FIG.

  In FIG. 1, a ring portion 16 is attached to the shield tube 4 so as to wrap around the outer periphery of the shield tube 4. A pair of wing parts 17 are integrated with the ring part 16. Further, a hub movement restricting member 11 is attached to the shield tube 4. The hub movement restricting member 11 includes a pair of cantilever portions 12. In FIG. 1, only one of the pair of cantilever portions 12 is illustrated, but the pair of cantilever portions 12 are arranged so as to sandwich the side surface of the shield tube 4.

  In the state of FIG. 1, if the pair of wing portions 17 are lifted upward and are gripped so that the tip portions 12 a of the pair of cantilever portions 12 are pressed against the ring portion 16, the hub movement restricting member 11 is shielded during this gripping. It is fixed to the cylinder 4.

  On the other hand, as shown in FIG. 2, the stopper 13 is integrated with the hub movement restricting member 11. In the state of FIG. 2, the front end 13 a of the stopper 13 is in contact with the rear end surface 9 a of the inner hub 9.

  For this reason, in the state where the cantilever 12 of the hub movement restricting member 11 is gripped, the movement of the inner hub 9 and the inner needle 8 integrated therewith is also restricted. Therefore, in this state, it is possible to puncture the patient with the inner needle 8 without the inner needle 8 being pushed back to the shield tube 4 side.

  When the inner needle 8 is punctured, the soft outer needle 7 is also punctured. After puncturing the inner needle 8 and the outer needle 7, the gripping of the cantilever 12 is released, and the tube 10 is pulled in the direction of arrow a, whereby the inner needle 8 integrated with the inner hub 9 is shown in FIG. Is drawn into the shield tube 4. As a result, only the soft outer needle 7 can be placed in the puncture portion, and even when the patient moves, the pain at the puncture portion can be relieved and blood vessel damage can be prevented.

  In the state of FIG. 4, a liquid such as a chemical solution to be administered to a patient is supplied from the tube 10 into the inner hub 9. The inner hub 9 includes a flow path 21 and a through hole 22 penetrating in the radial direction of the inner hub 9, and the flow path 21 and the through hole 22 are connected. The liquid supplied into the inner hub 9 flows out from the inner hub 9 through the flow path 21 and the through hole 22. The liquid flowing out from the inner hub 9 passes through the main body 2 to the hollow portion of the outer needle 7 and is administered into the body.

  Here, if there is air in the indwelling needle device 1 during administration of a drug solution or the like, the air enters the blood vessel together with the drug solution or the like. For this reason, prior to puncturing, an operation called priming is performed in which the indwelling needle device 1 is preliminarily filled with a liquid such as a physiological saline or a nutrient.

  The flow of the liquid during the priming operation will be described with reference to FIGS. FIG. 5 shows an enlarged sectional view of the vicinity of the inner hub 9 in FIG. FIG. 5 shows a cross section in the axial direction of the through hole 22 of the inner hub 9. 6 is an enlarged cross-sectional view of the vicinity of the inner hub 9 in a direction orthogonal to the cross-sectional direction of FIG. That is, FIG. 6 shows a cross section in the radial direction of the through hole 22 of the inner hub 9. FIG. 7 shows an enlarged perspective view of the inner hub 9.

  The priming operation is performed with the inner needle 8 protruding from the outer needle 7 as shown in FIG. In FIG. 5, at the time of the priming operation, a liquid such as physiological saline is supplied from the tube 10 side toward the inner hub 9 (in the direction of arrow b). The liquid supplied to the inner hub 9 flows into the through hole 22 through the flow path 21. The liquid that has flowed into the through hole 22 flows toward the outer peripheral surface side of the inner hub 9, that is, toward the opening sides at both ends of the through hole 22 (in the direction of arrow c), and toward the inner needle 8 (in the direction of arrow d). To flow.

  The liquid flowing in the direction of the arrow c passes between the outer peripheral surface of the inner hub 9 and the inner peripheral surface of the outer hub 5 and travels toward the tip 26 side of the inner hub 9. Before describing the flow of liquid flowing out from the openings at both ends of the through hole 22, the configuration of the inner hub 9 and the relationship between the inner hub 9 and the outer hub 5 will be described.

  FIG. 7 shows an enlarged perspective view of the inner hub 9. The outer peripheral surface 23 of the inner hub 9 includes a concave portion 23a in which the outer peripheral surface 23 is recessed, thereby forming irregularities. Further, a protrusion 25 protruding from the recess 23 a is formed on the end 26 side of the inner hub 9 of the through hole 22.

  7 is a part of the outer peripheral surface 23 of the inner hub 9, and the same unevenness as that shown in FIG. 7 is formed on the other opening side of the through hole 22 (the back side of the paper surface). .

  As described above, the recess 23a is formed by recessing the outer peripheral surface 23. For this reason, as shown in FIG. 5, a space 30 is formed between the recess 23 a and the inner peripheral surface of the outer hub 5. The space 30 shown in FIG. 5 corresponds to a portion between the protrusion 25 and the tip 26 of the inner hub 9 in the recess 23a of the inner hub 9 shown in FIG.

  Moreover, the protrusion 25 which protruded from the recessed part 23a in FIG. 7 is also illustrated in sectional drawing of FIG. In FIG. 5, the surface of the protrusion 25 is close to the inner peripheral surface of the outer hub 5, but is not in a completely intimate contact state. For this reason, a gap 31 is formed between the surface of the protrusion 25 and the inner peripheral surface of the outer hub 5.

  This is the same between the portion of the outer peripheral surface 23 of the inner hub 9 where the recess 23 a is not formed and the inner peripheral surface of the outer hub 5. A portion of the outer peripheral surface 23 of the inner hub 9 where the recess 23a is not formed is also illustrated in the cross-sectional view of FIG. In FIG. 6, the outer peripheral surface 23 of the inner hub 9 is close to the inner peripheral surface of the outer hub 5, but is not in a completely intimate contact state. For this reason, a gap 32 is formed between the outer peripheral surface 23 of the inner hub 9 and the inner peripheral surface of the outer hub 5.

  As described above, the liquid flowing out of the through hole 22 moves toward the tip 26 side of the inner hub 9 while flowing through the gap 31 (FIG. 5), the space 30 (FIG. 5), and the gap 32 (FIG. 6). .

  Hereinafter, the flow of the liquid flowing out from the through hole 22 will be specifically described. The arrows e, f and g in FIG. 7 indicate the flow direction of the liquid flowing out from the through hole 22. In FIG. 7, when the protrusion 25 is viewed in plan, the wall surface 25 a of the protrusion 25 and the opening of the through hole 22 face each other. For this reason, when the liquid flows out from the through hole 22 toward the front end 26 of the inner hub 9, the flow of the liquid is restricted by the wall surface 25 a of the protrusion 25, and flows (arrows e and f) that are divided on both sides of the protrusion 25 are generated. The flow in the direction of the arrow e mainly proceeds in the space 30 (FIG. 5) toward the tip 26 side of the inner hub 9, and the flow in the direction of the arrow f wraps around the portion of the outer peripheral surface 23 where the recess 23a is not formed. Then, it flows into the gap 32 (FIG. 6).

  Further, as described above, since the gap 31 is formed between the surface of the protrusion 25 and the inner peripheral surface of the outer hub 5, a flow (arrow g) entering the gap 31 and over the protrusion 25 also occurs. Become.

  That is, the liquid flowing out of the through hole 22 proceeds in the axial direction of the inner hub 9 toward the distal end 26 side of the inner hub 9 as a whole. The flow proceeding in the circumferential direction of the hub 9 is also promoted.

  In FIG. 3, the liquid that has flowed to the tip 26 of the inner hub 9 further moves into the outer needle 7. The vicinity of the front end 26 of the inner hub 9 and the inner peripheral surface of the outer hub 5 are not completely in close contact with each other but form a gap 33. A gap 34 is also formed between the hole 35 of the outer hub 5 and the inner needle 8. Further, a gap 35 is also formed between the inner peripheral surface of the outer needle 7 and the outer peripheral surface of the inner needle 8.

  For this reason, the liquid that has flowed to the front of the tip 26 of the inner hub 9 flows out (arrow h) from the tip of the outer needle 7 through the gap 33, the gap 34, and the gap 35. On the other hand, the liquid traveling in the direction of the arrow d in FIG. 5 flows out from the tip of the inner needle 8 through the hollow portion of the inner needle 8 as indicated by the arrow i in FIG.

  Therefore, in the indwelling needle device 1, the space and the gap between the through hole 22 and the tips of the inner needle 8 and the outer needle 7 are filled with the liquid by the priming operation as described above, and from these spaces and gaps, The air is exhausted.

  Next, the inner hub 9 in the present embodiment will be described in comparison with a comparative example. FIG. 8 is a perspective view of the inner hub 100 according to the comparative example. The inner hub 100 is formed by forming a through hole 102 on an outer peripheral surface 101 having no irregularities. For this reason, the inner hub 100 does not include the recess 23a and the protrusion 25 unlike the inner hub 9 shown in FIG.

  In the inner hub 100 of FIG. 8, the liquid from the through hole 102 flows out toward the tip 103 side of the inner hub 100. For this reason, the liquid flow (arrow j) on the line connecting the through hole 102 and the tip 103 becomes strong, and air is also easily discharged together with this flow. On the other hand, the flow (arrow k) in the circumferential direction of the inner hub 100 becomes weak. For this reason, in the circumferential direction of the inner hub 100, the liquid becomes difficult to spread as the distance from the opening of the through hole 102 increases. Therefore, in the circumferential direction of the inner hub 100, air bubbles are likely to stay in a portion away from the opening of the through hole 102.

  In the present embodiment, as described above, as shown in FIG. 7, by forming the protrusion 25, the liquid flowing out from the opening of the through hole 22 is diverted to both sides of the protrusion 25, so It is also possible to promote the flow in the direction. For this reason, in the circumferential direction of the inner hub 9, the discharge of bubbles is also promoted at a portion away from the opening of the through hole 22.

  Further, as shown in FIG. 7, in the circumferential direction of the inner hub 9, the opening of the through hole 22 is sandwiched between the recesses 23a. In this configuration, the concave portion serves as a groove for guiding the liquid flow in the circumferential direction of the inner hub 9, and this also promotes the flow of liquid proceeding in the circumferential direction of the inner hub 9.

  Therefore, according to the present embodiment, the replacement of air and liquid is ensured by filling the liquid by the priming operation, and bubbles can be prevented from staying on the outer peripheral surface of the inner hub 9.

  In FIG. 7, the shape of the protrusion 25 may be arranged so as to guide the liquid flowing out from the opening of the through hole 22 toward the tip 26 side of the inner hub 9 in the circumferential direction of the inner hub 9. It is not limited to the shape. In the present embodiment, when the projection 25 is viewed in plan, the side surfaces on both sides of the projection 25 are arranged in a substantially V shape, and the width of the projection 25 increases toward the through hole 22. In this configuration, as described above, the liquid immediately after flowing out from the opening of the through hole 22 can be guided in the circumferential direction of the inner hub 9 by the wall surface 25a of the projection 25, and the tip end portion (A portion) of the projection 25 is Since it has a sharp shape, it is possible to prevent bubbles from staying at the tip of the protrusion 25.

  FIG. 9 shows a perspective view of an inner hub 40 according to another embodiment of the present invention. The inner hub 40 shown in this figure is different from the inner hub 9 shown in FIG. In the protrusion 25 of the inner hub 9 shown in FIG. 7, no gap is formed between the end portion on the through hole 22 side and the opening of the through hole 22. On the other hand, the inner hub 40 shown in FIG. 8 forms a gap of d dimension between the protrusion 25 and the opening of the through hole 22. The dimension d is the dimension of the gap between the protrusion 25 and the opening of the through hole 22 on the central axis 18 of the inner hub 9 when the inner hub 9 is viewed in plan.

  Even in this configuration, the liquid flowing out from the opening of the through hole 22 is regulated by the wall surface 25a of the protrusion 25 and is diverted, and the flow proceeding in the circumferential direction of the inner hub 40 is promoted. On the other hand, as the protrusion 25 moves away from the opening of the through hole 22, the liquid becomes difficult to spread in the circumferential direction at the position where the through hole 22 is formed. For this reason, it is desirable that the gap of dimension d is ½ or less of the shortest distance L between the opening of the through hole 22 and the tip 26 of the inner hub 9.

  As described above, since the needle device according to the present invention can prevent air bubbles from staying on the outer peripheral surface of the inner hub, the needle device is useful as a medical needle device used for infusion or blood transfusion, for example.

DESCRIPTION OF SYMBOLS 1 Indwelling needle apparatus 2 Cylindrical main body 3 Needle-shaped part 4 Shield cylinder 5 Outer hub 7 Outer needle 8 Inner needle 9 Inner hub 18 Central axis of inner hub 22 Through-hole 23 Outer peripheral surface of inner hub 23a Concave 25 Protrusion 25a Protrusion of protrusion Wall 26 End of inner hub

Claims (7)

An inner hub with a needle attached to the tip;
A cylindrical main body in which the inner hub is housed,
The inner hub is
A through hole penetrating in the radial direction of the inner hub;
And a projection which projects from the outer peripheral surface of the front Kenai hub seen including,
The protrusion is disposed at a position on the tip side of the inner hub with respect to the opening of the through hole, and a wall surface on the rear side of the protrusion is opposed to the opening of the through hole. apparatus.   The needle device according to claim 1, wherein the inner hub includes a concave portion in which an outer peripheral surface of the inner hub is depressed, and the protrusion protrudes from the concave portion.   The needle device according to claim 1 or 2, wherein the protrusion is arranged to guide the liquid flowing out from the opening of the through hole in a circumferential direction of the inner hub.   The needle device according to any one of claims 1 to 3, wherein a wall surface of the protrusion and the opening of the through hole face each other when the protrusion is viewed in plan.   The needle device according to any one of claims 2 to 4, wherein an opening of the through hole is sandwiched between the recesses in a circumferential direction of the inner hub.   When the inner hub is viewed in plan, on the central axis of the inner hub, the size of the gap between the protrusion and the opening of the through hole is between the opening of the through hole and the tip of the inner hub. The needle device according to any one of claims 1 to 5, wherein the needle device is ½ or less of the shortest distance.   The side surface on both sides of the protrusion is arranged in a substantially V shape when the inner hub is viewed in a plane, and the width of the protrusion increases toward the through hole. The needle device described.

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