JP6760472B2 - Indwelling needle - Google Patents

Description

The present disclosure relates to indwelling needles, particularly to winged indwelling needles having a safety mechanism.

For indwelling needles used for blood collection or infusion, a safety mechanism for preventing erroneous puncture after use is desired. As a safety mechanism, a structure is known in which a needle hub to which a puncture needle is attached is slid and housed in a housing. There are two types, one is to manually accommodate the needle hub and the other is to use a moving mechanism such as a spring. Those that manually accommodate the needle hub are difficult to operate with one hand. By providing the moving mechanism, the accommodation operation can be performed with one hand.

As an indwelling needle having a movement mechanism of the needle hub, for example, a needle hub having an arm extending toward the top surface in the height direction, a housing for accommodating the needle hub, and a spring for moving the needle hub are known. (See, for example, Patent Document 1). By engaging the arm with the housing and puncturing with the needle hub housed in the housing so that the needle tip is exposed, and disengaging the arm after use, the needle hub is moved to the proximal end side. It can be moved to accommodate the needle tip in the housing. The engagement between the arm and the housing can be released with one hand by pushing the operation button provided on the arm.

Japanese Unexamined Patent Publication No. 2003-180829

However, an indwelling needle having a mechanism for moving a needle hub with an arm inside the housing has a problem that the housing becomes large. In particular, if an arm that is a cantilever extending in the height direction from the needle hub is provided, the height direction of the housing must be increased. If the height direction of the housing protrudes from the width direction of the housing, it becomes difficult to fix the indwelling needle to the skin. Therefore, the width direction of the housing must also be increased, and the housing becomes larger.

An object of the present disclosure is to make it possible to realize a miniaturized indwelling needle.

One aspect of the indwelling needle of the present disclosure is a deformable wing portion that extends laterally, a needle hub to which a puncture needle protruding toward the tip is fixed, a housing, a needle hub, and a puncture needle tip of the housing. A moving mechanism for moving the tip of the puncture needle from a first position protruding from the tip to a second position housed in the housing is provided, and the needle hub protrudes laterally from the shaft portion and the shaft portion. The housing has a front portion provided with a wing portion and a rear portion provided on the proximal end side of the front portion and having a wider width in the direction in which the wing portion expands than the front portion. The arm disengages with the housing when the needle hub is in the first position, blocking the movement of the needle hub by the moving mechanism and disengaging from the housing. Then, it moves to the second position in the rear part.

With such a configuration, it is possible to suppress an increase in the height direction of the housing, and further, in a housing for storing and protecting the arm when the arm moves, the width of the front part of the housing is larger than the width of the rear part of the housing. Since the housing is small, the housing is less likely to interfere with the user during puncture, and the overall size of the housing can be reduced. Further, since the wing portion is provided in the front portion of the housing, the range of motion of the wing portion is large, and the specifications can be made excellent in operability. Further, since the arm can be provided on the proximal end side of the wing portion, the specification can be made so that the wing portion can be fixed to the patient and the needle hub and the housing can be easily unlocked with one hand.

In one aspect of the indwelling needle, the arm may be configured to extend from the shaft portion toward the proximal end side. With such a configuration, the rear portion of the housing can be miniaturized as compared with the case where the arm extends toward the tip end.

The arm can be made to project from the shaft portion to both sides. With such a configuration, it is possible to prevent malfunction.

In one aspect of the indwelling needle, the rear portion can be configured to have a height smaller than the width. With such a configuration, the shape of the rear portion of the housing can be made flat in the width direction, and the stability of the housing when it is placed on the skin can be improved.

In one aspect of the indwelling needle, the front portion has a width of 3.0 mm or more and 4.5 mm or less and a height of 3.0 mm or more and 4.5 mm or less, and the rear portion has a width of 7.0 mm or more and 10 It can be 0.0 mm or less and the height is 4.5 mm or more and 5.5 mm or less. With such a configuration, the step between the puncture needle and the housing can be reduced, and the puncture pain at the time of puncture and needle removal can be reduced. Further, the stability at the time of indwelling can be improved.

In one aspect of the indwelling needle, the arm can be made to engage a window provided between the front and rear portions of the housing when the needle hub is in the first position. With such a configuration, it is not necessary to provide a separate button, and the number of parts can be reduced.

Another aspect of the indwelling needle of the present disclosure is a first, in which a needle hub to which a puncture needle protruding toward the tip is fixed, a housing having a grip portion, and a needle hub, the tip of the puncture needle protrudes from the tip of the housing. The needle hub is equipped with a moving mechanism for moving the tip of the puncture needle from the position of the above to a second position housed in the housing, and the needle hub is an elastically deformable arm protruding laterally from the shaft portion. The housing has a front portion and a rear portion that is provided on the proximal end side of the front portion and is wider than the front portion, and the arm has a needle hub in the first position. In addition, it engages with the housing in a disengageable manner to prevent the needle hub from moving by the moving mechanism, and when the engagement with the housing is disengaged, the needle hub moves to the second position in the rear portion.

According to the indwelling needle of the present disclosure, the overall shape can be miniaturized.

It is a top view which shows the indwelling needle which concerns on one Embodiment. It is sectional drawing in line II-II of FIG. It is a front view which shows the indwelling needle which concerns on one Embodiment. FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. It is sectional drawing which shows the state which unlocked the needle hub in the indwelling needle which concerns on one Embodiment. It is sectional drawing which shows the state which the movement of the needle hub is completed in the indwelling needle which concerns on one Embodiment. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows the modification of the indwelling needle.

In the present disclosure, the side that becomes the patient side when using the instrument will be described as the tip, and the opposite side will be the base end. In addition, the direction along the skin surface on which the device is fixed is the width direction, and the direction intersecting the width direction is the height direction.

As shown in FIGS. 1 to 4, the indwelling needle according to the embodiment is an indwelling needle with a wing, and a deformable wing portion 103 extending laterally and a puncture needle 111 protruding in the tip direction are fixed. The needle hub 101, the housing 102 accommodating the needle hub 101, and the needle hub 101 are accommodated in the housing 102 from the first position where the tip of the puncture needle 111 protrudes from the tip of the housing. It is provided with a moving mechanism 104 for moving to the second position.

The needle hub 101 has a shaft portion 112 to which the puncture needle 111 is fixed, and an elastically deformable arm 113 protruding from the shaft portion 112 on both sides. The housing 102 has a front portion 121 to which the wing portion 103 is attached, and a rear portion 122 that is provided on the proximal end side of the front portion 121 and has a wider width in the direction in which the wing portion 103 expands than the front portion 121. ing. When the needle hub 101 is in the first position, the arm 113 disengages with the housing 102 to prevent the needle hub 101 from moving by the moving mechanism 104, and disengages from the housing 103. Then, it moves to the second position in the rear portion 122.

In the present embodiment, the shaft portion 112 of the needle hub 101 has a cylindrical shape, and the puncture needle 111 is fixed to the tip end side. A connecting portion of the tube 106 is provided on the rear end side. In the present embodiment, the arm 113 extends from the vicinity of the center of the shaft portion 112 toward the proximal end side. The end 113A of the arm 113 is a free end and is engaged with the housing 103. By pressing the end portion 113A, the engagement with the housing 103 is released, and the end portion 113A can be moved to the shaft portion 112 side. Two arms 113 are provided on both sides of the shaft portion 112, and the two arms 113 extend in a U shape. The end side of the arm 113 is a thick operation button 113B.

In the present embodiment, the front portion 121 of the housing 102 has a cylindrical shape, the rear portion 122 has a flat tubular shape whose height is smaller than the width in the direction in which the wing portion 103 expands, and the outer diameter of the front portion 121 is the wing. It is slightly smaller than the height of the rear portion 122 in consideration of attaching the portion 103. An intermediate portion 123 formed so that the top surface is tapered in the height direction and the width direction is provided between the front portion 121 and the rear portion 122. The intermediate portion 123 is provided with a window portion 123a having an open side surface. If the shaft portion 112 can pass through the front portion 121, the arm 113 does not have to pass through, and the inner and outer diameters of the front portion 121 can be made smaller than that of the rear portion 122 through which the arm 113 passes. If the front portion 121 and the rear portion 122 having different outer diameters are smoothly connected by the intermediate portion 123 without a large step, it is possible to prevent the corner portion from hitting and pressing the patient's body. However, there may be a step in the intermediate portion 123. Further, the intermediate portion 123 is not provided, and the base end portion of the front portion 121 and the tip end portion of the rear portion 122 may be in contact with each other.

In the present embodiment, the moving mechanism 104 is a coil spring, which is arranged between the needle hub flange 115 provided on the needle hub 101 and the housing flange 125 provided at the tip of the housing 102. When the needle hub 101 is in the first position, the moving mechanism 104 is compressed and urges the needle hub 101 toward the proximal end.

When the needle hub 101 is in the first position, the arm 113 is engaged with the housing 102 and can hold the needle hub 101 in the first position against the urging force of the moving mechanism 104. In the present embodiment, an example is shown in which the end portion 113A of the arm 113 is engaged with the edge on the base end side of the window portion 123a provided in the housing 102.

When the needle hub 101 is in the first position, the operation button 113B of the arm 113 is exposed so as to project from the window portion 123a to the outside of the housing 102. When the operation button 113B is pressed from the outside of the housing 102, the end portion 113A moves toward the shaft portion 112 side, and the engagement with the edge of the window portion 123a is released as shown in FIG.

When the engagement between the arm 113 and the housing 102 is released, the needle hub 101 moves to the second position by the urging force of the moving mechanism 104 as shown in FIG. The second position is closer to the base end than the first position, and is the position where the tip of the puncture needle 111 is housed in the housing 102.

When the needle hub 101 moves to the second position, the arm 113 engages with the locking mechanism provided at the base end portion of the housing 102 and is locked irreversibly. As a result, the movement of the needle hub 101 in the proximal direction and the distal end direction is restricted. In the case of the winged indwelling needle of the present embodiment, the locking mechanism at the second position is composed of two elements. One is an elastically deformable protrusion 128 provided at the rear end of the housing 102, which engages with a recess 113C provided at the corresponding portion of the arm 113. As a result, the movement of the needle hub 101 in the proximal direction and the distal end direction is restricted. The other is a portion of the arm 113 protruding from the rear end of the housing 102. The portion of the arm 113 protruding from the rear end of the housing 102 expands more than the inner dimension of the rear portion 122 and cannot return to the inside of the housing 102. As a result, the movement of the needle hub 101 in the tip direction is restricted. By preventing the movement of the needle hub 101 at the second position by the arm 113, there is an advantage that the configuration of the movement prevention means becomes simpler than that by the shaft portion 112. It is not necessary to provide the recess 113C in the arm 113. Further, the elastically deformable protrusion 128 and the arm 113 may be engaged with each other to restrict only the movement of the needle hub 101 in the proximal direction.

The winged indwelling needle of the present embodiment has a housing 102 having a front portion 121 having an inner diameter through which the shaft portion 112 can pass but not the arm 113, and a rear portion 122 having an inner diameter through which the arm 113 can pass. .. In order to obtain a winged indwelling needle with good operability during puncture, it is preferable to make the rear portion 122 as short as possible. However, from the viewpoint of operability when operating the safety mechanism and providing a lock mechanism for preventing the needle hub 101 from moving in the reverse direction, it is required to secure a rear portion 122 having a certain length. Further, by using the arm 113 extending to the base end side, the operability of the safety mechanism is ensured even if the length of the rear portion 122 is shortened as compared with the case of using the arm extending to the tip end side. The needle hub 101 can be securely locked.

In the present embodiment, an example is shown in which the end portion 113A of the arm 113 is engaged with the edge of the window portion 123a provided in the intermediate portion 123 when the needle hub 101 is in the first position. However, a different configuration may be used as long as the arm 113 can be disengaged from the housing 102. For example, a convex portion may be provided at the end portion 113A of the arm 113, and the convex portion may be configured to engage with a locking hole or the like provided in the housing 102.

By configuring the two arms 113 to extend in both directions from the shaft portion 112, it is possible to prevent inadvertent release of the lock at the first position. In this case, the lock can be released when the operation button 113B is pressed from the left and right at the same time. Therefore, if one of the operation buttons 113B is unintentionally touched, or a malfunction due to vibration or impact during transportation may occur. It can be made less likely to occur. Further, by adopting the configuration in which the two arms 113 are extended in the lateral direction, the height of the housing 102 can be lowered, and the winged indwelling needle can be easily fixed to the patient's body. However, for example, as shown in FIG. 7, the number of arms 113 may be one.

In this embodiment, an example is shown in which the operation button 113B is integrated with the arm 113. In this way, the number of parts can be reduced and assembly becomes easy. However, the operation button can be separated from the arm 113. For example, an operation button for pressing the end of the arm 113 can be provided on the housing 102 side.

In the present embodiment, at least a part of the arm 113 protrudes from the rear end of the housing 102 at the second position. As a result, the arm 113 can function as a locking mechanism for restricting the needle hub 101 from returning to the tip side. Further, there is an advantage that the axial length of the housing 102 can be shortened. However, the arm 113 may not protrude from the rear end of the housing 102 at the second position.

In the present embodiment, four elastically deformable protrusions 128 are provided at the rear end of the housing 102 as a locking mechanism at the second position. By engaging the four protrusions 128 with the four recesses 113C of the arm 113, the needle hub 101 can be sufficiently locked at the second position. However, at least one set of the protrusion 128 and the corresponding recess 113C may be sufficient. Further, an example is shown in which a notch is provided at the rear end portion of the housing 102 to form a tongue-shaped flexible piece in order to make the protrusion 128 elastically deformable. With such a configuration, it is possible to easily form the elastically deformable protrusion 128. However, a protrusion 128 that can be elastically deformed may be provided by another configuration.

The lock mechanism may have any configuration as long as it can regulate the movement of the needle hub 101 to the tip end side and the base end side. For example, the convex portion provided at the end portion of the arm 113 may be configured to engage with the locking hole or the like provided at the rear end portion of the housing 102.

In this embodiment, an example is shown in which the two arms 113 extend toward the proximal end side. Since the arm 113 extends toward the base end side, a part of the arm 113 can be easily projected from the rear end portion of the rear portion 122 to function as a locking mechanism at the second position. However, as shown in FIG. 8, the arm 113 may be configured to extend toward the tip end side.

In the case of a configuration in which the arm extends upward as shown in FIG. 7, for example, a locking mechanism at the second position can be formed by providing an elastically deformable convex portion on the side surface of the housing 102.

The puncture needle 111 can be a metal tube such as stainless steel having an obliquely cut tip. A needle made of a metal other than stainless steel, a resin, or the like can also be used. The length and thickness of the needle can be appropriately selected according to the purpose.

The needle hub 101 can be made of resin. For example, it can be formed of polyethylene, polypropylene, polyester, polycarbonate, acrylic or the like. By making it transparent or translucent, it is possible to confirm the flow of blood or the like. The shaft portion 112 and the arm 113 can be integrally molded. The puncture needle 111 can be fixed to the needle hub 101 by using an adhesive, welding, welding, or the like. The tube 106 connected to the proximal end side of the needle hub 101 can be a flexible resin tube. Further, a connector or the like can be connected to the base end of the tube 106.

The moving mechanism 104 may have any configuration as long as the needle hub 101 can be moved from the first position to the second position. For example, it can be a spirally wound coil spring. The coil spring can be formed of a metal such as iron or stainless steel, a resin, or the like. The smaller the diameter of the coil spring, the smaller the diameter of the front portion 121 can be.

The housing 102 can be made of resin. For example, it can be formed of polyethylene, polypropylene, polyester, polycarbonate, acrylic or the like. By making it transparent or translucent, it is possible to confirm the flow of blood or the like.

Although the cross-sectional shape of the front portion 121 is circular in the present embodiment, the cross-sectional shape of the front portion 121 is not limited to this. However, from the viewpoint of preventing dead space, it is preferable that the shape has substantially the same width and height. From the viewpoint of operability, the external dimensions of the front portion 121 are preferably, for example, a width of about 3.0 mm or more and 4.5 mm or less, and a height of about 3.0 mm or more and 4.5 mm or less.

When the arm 113 extends laterally, the rear portion 122 preferably has a flat shape having a height smaller than the width. For example, the width can be 7.0 mm or more and 10 mm or less, and the height can be 4.5 mm or more and 5.5 mm or less. Keeping the height low has the advantage of being easily fixed to the patient's body. However, the rear portion 122 does not have to have a flat shape, and may have a cylindrical shape, for example. When the arm 113 extends upward, it can have a flat shape having a height larger than the width. Further, it may have a cylindrical shape instead of a flat shape. Further, the front portion 121 may have a flat shape.

By lowering the height of the front portion 121, the step between the puncture needle 111 and the housing 102 can be reduced, and the puncture pain during puncture and needle removal can be reduced. Further, the height of the rear portion 122 is smaller than the width of the rear portion 122, and the height of the front portion 121 is smaller than or the same as the height of the rear portion 122, thereby improving the stability during indwelling. The width of the front portion 121 is preferably a dimension that makes it easy to see the puncture portion, and the width of the rear portion 122 is a dimension suitable for one-handed operation, that is, a dimension in which a finger for pressing a button is naturally arranged. Is preferable.

In the present embodiment, the cross-sectional shape of the front portion 121 is circular, the cross-sectional shape of the rear portion 122 is square, and the cross-sectional shapes of the front portion 121 and the rear portion 122 are different. However, the cross-sectional shape is not limited to the embodiment. The cross-sectional shapes of the front portion 121 and the rear portion 122 can be the same. For example, the cross-sectional shapes of the front portion 121 and the rear portion 122 can both be rectangular, both circular, or both elliptical.

Further, in the present embodiment, an intermediate portion 123 having a window portion 123a is provided between the front portion 121 and the rear portion 122 of the housing 102. However, the intermediate portion 123 may not be provided, and the front portion 121 and the rear portion 122 may be in contact with each other. In this case, the window portion 123a can be provided on, for example, the rear portion 122. Further, instead of providing the window portion 123a on which the operation button 113B provided on the arm 113 is exposed, a convex portion is provided on the arm 113 and a through hole for engaging with the convex portion is provided on the rear portion 122 or the like. You can also. In this case, an operation button for releasing the engagement between the convex portion and the through hole may be provided on the housing 102 side. Further, the arm 113 may be configured to be exposed to the outside from the rear end portion of the housing after the safety mechanism is activated.

Further, when there is no wing portion, it is preferable that the housing is provided with grip portions such as dents matching the shape of the finger on both side surfaces.

The wing portion 103 can be made of a flexible resin. For example, it can be formed of polyethylene, polypropylene, vinyl chloride, or the like. The surface of the wing portion 103 may be provided with irregularities or the like for easy gripping or fixing to the patient's body. The wing portion 103 has, for example, a configuration having a tubular outer fitting portion that is outerly fitted to the front portion 121, and can be attached by being outerly fitted to the front portion 121. However, the present invention is not limited to this, and any configuration may be used as long as it can be attached to the front portion 121.

In the present embodiment, an example in which the wing portion 103 extends to both sides is shown, but a configuration in which the wing portion 103 extends to only one side is also possible. Further, the indwelling needle without the wing portion 103 can be used.

The indwelling needle of the present disclosure is useful as an indwelling needle or the like in which the needle hub can be miniaturized and operability and safety are improved.

101 Needle Hub 102 Housing 103 Wing 104 Moving Mechanism 106 Tube 111 Puncture Needle 112 Shaft 113 Arm 113A End 113B Operation Button 113C Recess 115 Needle Hub Flange 121 Front 122 Rear 123 Middle 123a Window 125 Housing Flange 128 Protrusion

Claims (5)

A needle hub puncture needle that protrudes above the end direction is fixed,
With the housing
Deformable wings that extend laterally from the housing
A moving mechanism for moving the needle hub from a first position where the tip of the puncture needle protrudes from the tip of the housing to a second position where the tip of the puncture needle is housed in the housing is provided.
The needle hub has a shaft portion, an elastically deformable arm projecting laterally from the shaft portion, and a needle hub flange provided on the tip side of the arm portion .
The housing includes a front side portion, said and a wider rearward portion than and the front portion is provided on the base end side than the front portion, the ratio of the width to the height dimension at the rear portion, Larger than the ratio of the width dimension to the height dimension in the front part,
The moving mechanism is housed in the front portion when the needle hub is in the first position.
The needle hub flange is located in the front portion and urged toward the proximal end side by the moving mechanism when the needle hub is in the first position.
The arm disengages with the housing when the needle hub is in the first position to prevent the needle hub from moving by the moving mechanism and disengage from the housing. Then, the indwelling needle moves in the rear portion to the second position. The indwelling needle according to claim 1, wherein the arm extends from the shaft portion toward the proximal end side. The indwelling needle according to claim 1, wherein the arm extends from the shaft portion toward the tip end side. The front portion has a width of 3.0 mm or more and 4.5 mm or less and a height of 3.0 mm or more and 4.5 mm or less.
The indwelling needle according to any one of claims 1 to 3 , wherein the rear portion has a width of 7.0 mm or more and 10.0 mm or less and a height of 4.5 mm or more and 5.5 mm or less. The arm according to any one of claims 1 to 4 , wherein the arm is engaged with a window portion formed between the front portion and the rear portion of the housing when the arm is in the first position. Indwelling needle.

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