JP2020096812A - Indwelling needle - Google Patents

Abstract

To provide an indwelling needle for enabling a needle hub storage operation to be performed by one hand and also achieving thinning of a tip end part.SOLUTION: An indwelling needle 111 includes: a needle hub 101; a housing 102; and a movement mechanism 104 for moving the needle hub from a first position to a second position. The needle hub has an elastically deformable arm 113 to be extended toward a base end side, The housing includes: a front part 121; and a rear part 122 arranged closer to a base end side than to the front part and having a width wider than that of the front part. The arm is releasably engaged with the housing when the needle hub is located at the first position, so as to prevent a movement of the needle hub by the movement mechanism, and prevents a movement of the needle hub to a tip end side and a base end side when the needle hub is located at the second position.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to an indwelling needle, and more particularly to a winged indwelling needle having a safety mechanism.

In an indwelling needle used for blood collection or infusion, a safety mechanism for preventing erroneous puncture after use is desired. As a safety mechanism, a structure in which a needle hub to which a puncture needle is attached is slid to be housed in a housing is known. There are two types, one for manually accommodating the needle hub and one for using a moving mechanism such as a spring. When the needle hub is manually accommodated, it is difficult to operate with one hand. By providing the moving mechanism, the housing operation can be performed with one hand.

As an indwelling needle having a needle hub moving mechanism, for example, one having a needle hub having an arm extending toward the top surface in the height direction, a housing for housing the needle hub, and a spring for moving the needle hub is known. (For example, refer to Patent Document 1). Puncture with the arm engaged with the housing so that the needle tip is exposed and the needle hub is housed in the housing.After use, disengage the arm to move the needle hub to the proximal side. The needle tip can be moved to be housed in the housing. The engagement between the arm and the housing can be released with one hand by pressing an operation button provided on the arm.

JP, 2003-180829, A

However, the indwelling needle having a mechanism in which the needle hub with an arm moves inside the housing has a problem that the housing becomes large. In particular, if a cantilevered arm 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 is larger than 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 be increased, and the housing becomes larger.

An object of the present disclosure is to realize a downsized indwelling needle.

One aspect of the indwelling needle of the present disclosure is a deformable wing portion that expands laterally, a needle hub to which a puncture needle protruding in a distal direction is fixed, a housing, and a needle hub, and the tip of the puncture needle is a housing. The needle hub has a shaft portion and a side portion protruding from the shaft portion, and a moving mechanism that moves the tip of the puncture needle from a first position protruding from the tip to a second position where the needle needle is housed in the housing. The housing has an elastically deformable arm, and the housing has a front portion provided with a wing portion and a rear portion provided on the base end side of the front portion and having a wider width in the direction in which the wing portion expands than the front portion. And the arm releasably engages the housing to prevent movement of the needle hub by the movement mechanism and is disengaged from the housing when the needle hub is in the first position. And moves to the second position in the rear part.

With this configuration, it is possible to suppress an increase in the height direction of the housing, and in a housing that houses and protects the arm when the arm is moved, the width of the front portion of the housing is larger than that of the rear portion of the housing. Is small, it is unlikely that the housing will interfere with the user during puncturing, 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 wing portion has a wide range of motion, and the specifications can be excellent in operability. Further, since the arm can be provided on the base end side of the wing portion, it is possible to make the specifications that the wing portion can be easily fixed to the patient and the needle hub and the housing can be unlocked with one hand.

In one mode 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 downsized as compared with the case where the arm extends in the front end direction.

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 stability can be improved when the housing is placed on the skin.

In one mode of the indwelling needle, the front part has a width of 3.0 mm or more and 4.5 mm or less and the height of 3.0 mm or more and 4.5 mm or less, and the rear part has a width of 7.0 mm or more and 10 mm or more. The height may be 4.5 mm or more and 5.5 mm or less at 0.0 mm or less. With such a configuration, the step between the puncture needle and the housing can be reduced, and puncture pain at the time of puncture and during needle removal can be reduced. Furthermore, the stability during detention can be improved.

In one aspect of the indwelling needle, the arm may 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 separately provide a button, and the number of parts can be reduced.

Another aspect of the indwelling needle according to the present disclosure is a needle hub to which a puncture needle protruding in a distal direction is fixed, a housing having a grip portion, and a needle hub, in which the tip of the puncture needle projects from the tip of the housing. From the position of (1) to a second position where the tip of the puncture needle is moved to a second position where the needle hub is housed in the housing, the needle hub has a shaft portion and an elastically deformable arm that projects laterally from the shaft portion. And the housing has a front portion and a rear portion that is provided proximally of the front portion and is wider than the front portion, and the arm has the needle hub in the first position. First, when the needle hub is releasably engaged with the housing to prevent the movement of the needle hub by the moving mechanism, and when the engagement with the housing is released, the needle hub is moved to the second position inside the rear portion.

According to the indwelling needle of the present disclosure, it is possible to reduce the overall shape.

It is a top view showing the indwelling needle concerning one embodiment. It is sectional drawing in the II-II line of FIG. It is a front view showing an indwelling needle concerning one embodiment. It is sectional drawing in the IV-IV line of FIG. FIG. 4 is a cross-sectional view showing a state in which the lock of the needle hub is released in the indwelling needle according to the embodiment. In an indwelling needle according to an embodiment, it is a cross-sectional view showing a state where the movement of the needle hub is completed. It is sectional drawing which shows the modification of an indwelling needle. It is sectional drawing which shows the modification of an indwelling needle.

In the present disclosure, the side that is the patient side when the device is used will be described as the distal end and the opposite side as the proximal end. The direction along the surface of the skin on which the device is fixed is the width direction, and the direction intersecting the width is the height direction.

As shown in FIGS. 1 to 4, the indwelling needle according to one embodiment is a winged indwelling needle, in which a deformable wing portion 103 that expands laterally and a puncture needle 111 that protrudes in the distal direction are fixed. The needle hub 101, the housing 102 that accommodates 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 projects from the tip of the housing. And a moving mechanism 104 for moving it to a second position.

The needle hub 101 has a shaft portion 112 to which the puncture needle 111 is fixed, and elastically deformable arms 113 protruding from the shaft portion 112 to 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 base 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. The arm 113 releasably engages with the housing 102 when the needle hub 101 is in the first position to prevent movement of the needle hub 101 by the moving mechanism 104 and release engagement with the housing 103. Then, the inside of the rear portion 122 is moved to the second position.

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 side. A connecting portion of the tube 106 is provided on the rear end side. In this embodiment, the arm 113 extends from the vicinity of the center of the shaft portion 112 to the base end side. The end portion 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 are expanded in a U shape. The end portion side of the arm 113 is a thick operation button 113B.

In the present embodiment, the front part 121 of the housing 102 has a cylindrical shape, the rear part 122 has a flat tubular shape having a height smaller than the width in the direction in which the wing part 103 expands, and the outer diameter of the front part 121 is the wing. The height is slightly smaller than the height of the rear portion 122 in consideration of mounting the portion 103. An intermediate portion 123 is provided between the front portion 121 and the rear portion 122 so that the top surface is tapered in the height direction and the width direction. The intermediate portion 123 is provided with a window portion 123a whose side surface is open. The front part 121 does not need to be able to pass the arm 113 as long as the shaft part 112 can pass, and the inner diameter and the outer diameter can be made smaller than the rear part 122 through which the arm 113 passes. By smoothly connecting the front portion 121 and the rear portion 122 having different outer diameters to the intermediate portion 123 without a large step, it is possible to prevent the corner portion from hitting and compressing the body of the patient. However, a step may be formed in the intermediate portion 123. Alternatively, the intermediate portion 123 may not be provided, and the base end portion of the front portion 121 and the front 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, and 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 biases 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 biasing 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 of the window portion 123a provided in the housing 102 on the base end side.

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 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 to 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 side than the first position, and is the position where the tip of the puncture needle 111 is accommodated in the housing 102.

When the needle hub 101 moves to the second position, the arm 113 engages with a lock mechanism provided at the base end portion of the housing 102 and is irreversibly locked. As a result, movement of the needle hub 101 in the proximal direction and the distal direction is restricted. In the case of the indwelling needle with wings of the present embodiment, the lock mechanism in the second position is composed of two elements. One is an elastically deformable protrusion 128 provided at the rear end of the housing 102, and the protrusion 128 engages with a recess 113C provided at a corresponding portion of the arm 113. As a result, movement of the needle hub 101 in the proximal direction and the distal 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 is wider than the inner dimension of the rear portion 122 and cannot return to the inside of the housing 102. As a result, movement of the needle hub 101 in the tip direction is restricted. By preventing the movement of the needle hub 101 in the second position by the arm 113, it is possible to obtain an advantage that the structure of the movement preventing means is simpler than that in the case of the shaft portion 112. In addition, the recess 113C may not be provided in the arm 113. Alternatively, 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.

In the winged indwelling needle of this embodiment, the housing 102 has a front portion 121 having an inner diameter through which the shaft portion 112 can pass but the arm 113 cannot pass through, and a rear portion 122 having an inner diameter through which the arm 113 can pass. .. In order to obtain a winged indwelling needle that has 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 a lock mechanism that prevents the needle hub 101 from moving in the opposite direction, it is necessary to secure the rear portion 122 of a certain length. Further, by using the arm 113 extending to the base end side, as compared with the case of using the arm extending to the distal end side, the operability of the safety mechanism is secured even if the length of the rear portion 122 is shortened. The needle hub 101 can be reliably locked.

In this embodiment, the example 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 has been shown. However, as long as the arm 113 can be releasably locked with the housing 102, different configurations may be used. For example, the end portion 113A of the arm 113 may be provided with a convex portion, and the convex portion may be configured to engage with a locking hole or the like provided in the housing 102.

With the configuration in which the two arms 113 extend from the shaft portion 112 in both directions, it is possible to prevent the accidental release of the locking from occurring in the first position. In this case, since the locking can be released when the operation buttons 113B are simultaneously pressed from the left and right, it is possible to prevent accidental touching of one operation button 113B, malfunction due to vibration or shock during transportation, or the like. It can be hard to occur. In addition, since the two arms 113 are laterally expanded, the height of the housing 102 can be reduced, and the indwelling winged 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 the present embodiment, an example in which the operation button 113B is integrated with the arm 113 has been shown. In this way, the number of parts can be reduced and the assembly becomes easy. However, the operation button may be provided separately 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 this embodiment, at least a part of the arm 113 projects from the rear end of the housing 102 at the second position. This allows the arm 113 to function as a lock mechanism that restricts the needle hub 101 from returning to the distal end side. Further, there is an advantage that the axial length of the housing 102 can be shortened. However, the arm 113 may not project from the rear end of the housing 102 in the second position.

In this embodiment, four elastically deformable protrusions 128 are provided at the rear end of the housing 102 as a lock mechanism in the second position. By engaging the protrusions 128 at the four positions with the recesses 113C at the four positions of the arm 113, the needle hub 101 can be sufficiently locked in the second position. However, the projection 128 and the corresponding recess 113C may be at least one set. Further, in order to make the protrusion 128 elastically deformable, a notch is provided at the rear end of the housing 102 to form a tongue-shaped flexible piece. With such a structure, the elastically deformable projection 128 can be easily formed. However, the elastically deformable protrusion 128 may be provided by another configuration.

The lock mechanism may have any configuration as long as the movement of the needle hub 101 toward the distal end side and the proximal end side can be restricted. For example, the convex portion provided at the end portion of the arm 113 may be configured to engage with the locking hole provided at the rear end portion of the housing 102.

In the present embodiment, an example has been shown in which the two arms 113 extend toward the base end side. Since the arm 113 extends toward the base end side, a part of the arm 113 can be easily protruded from the rear end of the rear portion 122 and can easily function as the lock mechanism in the second position. However, as shown in FIG. 8, the arm 113 may be configured to extend toward the tip side.

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

The puncture needle 111 can be a metal tube made of stainless steel or the like having a beveled tip. A needle made of metal or resin other than stainless steel 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 formed. 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. 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 it can move the needle hub 101 from the first position to the second position. For example, it may be a spirally wound coil spring. The coil spring can be formed of metal such as iron or stainless steel, resin, or the like. The smaller the diameter of the coil spring, the smaller the diameter of the front portion 121 can be made.

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 example in which the cross-sectional shape of the front portion 121 is circular is shown in the present embodiment, the cross-sectional shape of the front portion 121 is not limited to this. However, from the viewpoint of preventing a dead space, it is preferable that the width and the height are substantially equal. From the viewpoint of operability, it is preferable that the outer dimension of the front part 121 has 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. The low height has the advantage that it can be easily secured 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 is expanded upward, it can have a flat shape having a height larger than the width. Further, instead of a flat shape, for example, a cylindrical shape can be used. Moreover, the front part 121 can also be made into a flat shape.

By lowering the height of the front part 121, the step between the puncture needle 111 and the housing 102 can be reduced, and puncture pain during puncture and during 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 equal to the height of the rear portion 122, thereby improving stability during placement. The width of the front part 121 is preferably such that the puncture part can be easily seen, and the width of the rear part 122 is a size suitable for operation with one hand, that is, a size at which a finger for pushing a button is naturally arranged. It is preferable.

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

Further, in the present embodiment, the intermediate portion 123 having the 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 in the rear portion 122, for example. Further, in place of the configuration in which the window 123a for exposing the operation button 113B provided in the arm 113 is provided, a configuration is provided in which a convex portion is provided in the arm 113 and a through hole that engages with this is provided in the rear portion 122. You can also In this case, an operation button for releasing the engagement between the protrusion and the through hole may be provided on the housing 102 side. Alternatively, the arm 113 may be exposed to the outside from the rear end of the housing after the safety mechanism is activated.

Further, in the case where there is no wing portion, it is preferable that the housing is provided with gripping portions such as depressions matching the shape of the finger on both side surfaces.

The wings 103 can be made of flexible resin. For example, it can be formed of polyethylene, polypropylene, vinyl chloride, or the like. Concavities and the like may be provided on the surface of the wing portion 103 in order to facilitate grasping and fixing to the patient's body. The wing portion 103 has, for example, a configuration having a tubular outer fitting portion that is fitted onto the front portion 121, and can be fitted onto the front portion 121 and attached. However, the configuration is not limited to this, and may have any configuration as long as it can be attached to the front portion 121.

In the present embodiment, an example in which the wing portion 103 spreads on both sides has been shown, but it is also possible to have a configuration in which it spreads only on one side. Alternatively, an indwelling needle without the wing portion 103 can be used.

INDUSTRIAL APPLICABILITY The indwelling needle of the present disclosure can reduce the size of the needle hub and is useful as an indwelling needle or the like with improved operability and safety.

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 part 122 rear part 123 intermediate part 123a window part 125 housing flange 128 protrusion

Claims (7)

Deformable wings that spread laterally,
A needle hub to which the puncture needle protruding in the distal direction is fixed,
Housing,
A moving mechanism for moving the needle hub from a first position where the tip of the puncture needle projects from the tip of the housing to a second position where the tip of the puncture needle is accommodated in the housing;
The needle hub has a shaft portion and an elastically deformable arm protruding laterally from the shaft portion,
The housing has a front portion provided with the wing portion, and a rear portion provided on the base end side of the front portion and wider than the front portion,
The arm releasably engages with the housing when the needle hub is in the first position to prevent movement of the needle hub by the moving mechanism and release engagement with the housing. When moved, the indwelling needle moves to the second position inside the rear portion. The indwelling needle according to claim 1, wherein the arm extends from the shaft portion toward a proximal end side. The indwelling needle according to claim 1 or 2, wherein the arm projects from the shaft portion to both sides. The indwelling needle according to claim 1, wherein the rear portion has a height smaller than a width. 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 4, 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 5, wherein the arm engages a window formed between the front portion and the rear portion of the housing when in the first position. Indwelling needle. A needle hub to which the puncture needle protruding in the distal direction is fixed,
A housing having a grip portion,
A moving mechanism that moves the needle hub from a first position where the tip of the puncture needle projects from the tip of the housing to a second position where the tip of the puncture needle is accommodated in the housing;
The needle hub has a shaft portion and an elastically deformable arm protruding laterally from the shaft portion,
The housing has a front portion and a rear portion that is provided closer to the base end side than the front portion and is wider than the front portion.
The arm releasably engages with the housing when the needle hub is in the first position to prevent movement of the needle hub by the moving mechanism and release engagement with the housing. The indwelling needle that moves to the second position inside the rear part when being performed.

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