JP6777083B2 - Indwelling needle - Google Patents

Description

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

For indwelling needles used for blood collection or drip, a safety mechanism for preventing erroneous puncture after use is desired. As a safety mechanism, a needle hub to which a puncture needle is attached is slid and housed in a housing. There are those in which the needle hub is accommodated manually and those in which the needle hub is accommodated by using 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 needle hub moving mechanism, for example, a needle hub having an arm, 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

The indwelling needle having the moving mechanism of the needle hub also has a problem that a malfunction due to accidentally touching the operation button is likely to occur.

An object of the present disclosure is to make it possible to realize an indwelling needle that is less likely to malfunction.

The first aspect of the indwelling needle is to puncture a needle hub to which a puncture needle protruding in the tip direction is fixed, a wing portion extending in a direction intersecting the needle axis direction, a housing accommodating the needle hub, and a needle hub. The needle is provided with a moving mechanism for moving the tip of the puncture needle from a first position where the tip of the needle protrudes from the tip of the housing to a second position where the tip of the puncture needle is housed in the housing, and an operation unit for operating the moving mechanism. The hub has a movement restricting part that restricts the movement from the first position so that the movement can be released, and the operating part is integrated with the housing, and the fixed part fixed to the housing and the fixed part are located on the tip side of the fixed part. By moving the acting portion with the fixed portion as a fulcrum, the regulation by the movement restricting portion is released and the moving mechanism is operated.

Since the operating portion acting on the movement restricting portion is located on the tip side of the operating portion fixed to the housing, the size of the indwelling needle including the operating portion can be easily reduced. Further, since the wing portion is provided, it is difficult for a human hand to unintentionally touch the operating portion from the product packaging to the use. It is possible to reduce the risk of gripping only the acting part that acts on the movement restricting part, and it is possible to prevent the user from unintentionally releasing the movement restricting part, which causes a malfunction. It can be difficult. Further, by integrating the operation unit and the housing into an integral member, the force required for the operation can be increased and malfunction can be less likely to occur.

In the first aspect of the indwelling needle, the operating portions can be provided on both side surfaces of the housing. With such a configuration, malfunction prevention and ease of operation are improved. Further, by providing the wing portion, the prevention of malfunction during transportation is improved.

In the first aspect of the indwelling needle, the working portion may be located between the wing portion and the fixing portion. Since the working part is located between the wing part and the fixed part, it becomes difficult for a human hand to touch the working part. Further, the wing portion has a notch provided at the base end portion, and the acting portion can be located at the notch portion. With such a configuration, it becomes more difficult for human hands to touch the operating portion.

In the first aspect of the indwelling needle, when the restriction by the movement restricting portion is released, the acting portion can be moved from the standby position not in contact with the movement restricting portion to the operating position for pressing the movement restricting portion. .. With such a configuration, the regulation can be lifted when the working part is moved by a certain amount or more, so that malfunction can be less likely to occur.

In the first aspect of the indwelling needle, the movement restricting portion may be a plurality of arms extending from the side surface of the needle hub toward the tip end. With such a configuration, the size can be further reduced.

A second aspect of the indwelling needle is a needle hub to which the puncture needle is fixed, a housing for accommodating the needle hub, and a needle hub from a first position where the tip of the puncture needle protrudes from the tip of the housing. An operation unit that moves the tip of the needle to a second position housed in the housing, and an operation unit that operates the movement mechanism by rotating the end portion with respect to the housing by pressing inward. It is provided with a resistance portion that acts as a resistance to the rotation of the portion. By providing the resistance portion, it is possible to prevent the unintended operation of the moving mechanism from occurring. It should be noted that the operation unit may be designed to naturally return to the initial state after the operation unit is pressed inward with a finger, or may not be returned.

In the second aspect of the indwelling needle, the resistance portion may be a flexible piece that elastically deformably protrudes from the outer surface of the housing or the inner surface of the operation portion. With such a configuration, assembly becomes easy. Further, the resistance portion may be formed of an elastic member different from the housing and the operation portion. Such a configuration improves the degree of freedom in design.

In the second aspect of the indwelling needle, the operating portion has an operating portion main body, an engaging portion provided at the end of the operating portion main body so as to be engaged with the needle hub, and an assembling portion to be assembled to the housing. The assembling portion can rotatably fix the operating portion to the housing, and the engaging portion can move outward to disengage from the needle hub. In this case, the assembling portion can be provided between the engaging portion and the operation button.

In the second aspect of the indwelling needle, the needle hub has an arm that engages with the housing, the operation unit has an operation unit body and an operation button provided on the operation unit body, and the operation unit body , The first end is rotatably fixed to the housing via the assembly, the second end is located at the position corresponding to the arm, and the second end presses the operation button inward. This allows it to move inward and disengage the arm from the housing.

A third aspect of the indwelling needle is a needle hub to which the puncture needle is fixed, a housing for accommodating the needle hub, and a needle hub from a first position where the tip of the puncture needle protrudes from the tip of the housing. A moving mechanism that moves the tip of the head to a second position housed in the housing, and an operating unit that operates the moving mechanism by rotating the end with respect to the housing by pressing inward. It is provided with a resistance portion that limits the rotation of the portion by an elastic force.

A fourth aspect of the indwelling needle is a needle hub to which the puncture needle is fixed, a housing for accommodating the needle hub, and a needle hub from a first position where the tip of the puncture needle protrudes from the tip of the housing. A moving mechanism for moving the tip of the needle to a second position housed in the housing, and an operating portion for operating the moving mechanism by rotating the end with respect to the housing by pressing inward. The operation unit is provided at the operation unit main body, the engagement portion provided at the end of the operation unit main body so as to be engaged with the needle hub, and the other end portion of the operation unit main body located on the tip side of the engagement portion. The operation part is integrated with the housing, and by pressing the operation button inward, the engaging part moves outward to operate the moving mechanism.

In the first to fourth aspects of the indwelling needle, it is possible to further include an operation unit disabling unit that makes the operation unit inoperable.

A fifth aspect of the indwelling needle is a needle hub to which the puncture needle is fixed, a housing for accommodating the needle hub, and a needle hub from a first position where the tip of the puncture needle protrudes from the tip of the housing. A movement mechanism that moves the tip of the needle to a second position housed in the housing, and an arm that rotatably protrudes from the needle hub, and a movement control unit that regulates the movement from the first position so that it can be released. And a resistance portion that serves as a resistance to the rotation of the arm.

According to the indwelling needle of the present disclosure, it is possible to realize an indwelling needle that is less likely to malfunction.

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. It is sectional drawing in 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 lock mechanism. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows the deformation example of a resistance part. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows the modification of the indwelling needle. It is sectional drawing which shows an example of the tip direction regulation part. It is sectional drawing which shows an example of a window part. It is sectional drawing which shows the modification of the indwelling needle. It is a plane which shows the modification of the indwelling needle. It is a cross section which shows the modification of the indwelling needle. It is a cross section which shows the case where a needle hub is in a 2nd position in a modification of an indwelling needle. It is a cross section which shows the modification of the indwelling needle.

In the present disclosure, the side that becomes the patient side when using the device will be described as the tip, and the opposite side will be the base end.

As shown in FIGS. 1 to 4, the indwelling needle of the present embodiment is a winged indwelling needle having a wing portion 103, and a needle hub 101 to which a puncture needle 111 protruding toward the tip is fixed and a needle hub 101. The housing 102 and the needle hub 101 are moved from the first position where the tip of the puncture needle 111 protrudes from the tip of the housing 102 to the second position where the tip of the puncture needle 111 is housed in the housing 102. A moving mechanism 104 for operating the moving mechanism 104 and an operating unit 105 for operating the moving mechanism 104 are provided. The operation unit 105 is assembled to the housing 102 at a position closer to the base end side than the wing portion 103, and the operation unit 105 is operated to start the movement of the needle hub 101.

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 side.

In the present embodiment, the operation unit 105 is provided on a plate-shaped operation unit main body 150, an operation button 151 provided at an end portion of the operation unit main body 150 on the base end side, and an end portion on the tip end side of the operation unit main body 150. It has an engaging portion 153 that is provided and can be engaged with the needle hub 101, and an assembling portion 154 that is provided between the engaging portion 153 and the operation button 151 and is assembled to the housing 102. The engaging portion 153 is a convex portion that engages with the needle hub 101, and by engaging the engaging portion 153 with the needle hub 101, the movement of the needle hub 101 by the moving mechanism 104 can be restricted. The operation unit main body 150 is rotatably assembled to the housing 102 by an assembly unit 154 provided near the central portion, and the operation unit main body 150 can rotate around the assembly unit 154 within a certain angle range. As shown in FIG. 5, when the operation button 151 provided on the base end side of the operation unit main body 150 is pressed toward the needle hub 101 side (inside), the end portion on the tip side moves outward, and the engagement is a convex portion. The engagement between the portion 153 and the needle hub 101 is released. As a result, the movement restriction of the needle hub 101 is released, the movement mechanism 104 operates, the needle hub 101 moves from the first position to the second position as shown in FIG. 6, and the tip of the puncture needle 111 is moved. It is housed in the housing 102.

In the present embodiment, the assembly portion 154 is a convex portion protruding from the operation portion main body 150, and is engaged with the shaft hole 155 provided in the housing 102. Therefore, the assembling portion 154 functions as a fixing portion for fixing the operating portion 105 to the housing 102. Not limited to this, any configuration can be used as long as the operation unit main body 150 can be rotatably attached to the housing 102 with the assembly unit 154 as a fulcrum. For example, the assembly portion 154 may be a concave portion provided in the operation button 151, and may be configured to engage with the convex portion provided in the housing 102. Further, the operation portion 105 may be assembled to the housing 102 by a structure that serves as a rotatable fulcrum shaft, and the assembly portion 154 may be a through pin that penetrates the housing 102 and the operation button 151. By assembling the operation unit 105 to the housing 102 by the assembly unit 154, the degree of freedom in design can be improved.

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. At the center of the shaft portion 112, an elastically deformable arm 113 that protrudes from the shaft portion 112 to both sides and extends toward the base end side is provided. The two arms 113 can be arranged symmetrically with respect to the shaft portion 112, and can be formed into, for example, a V-shape, a U-shape, a C-shape, or the like. At the first position, the arm 113 engages with the engaging portion 153 of the operating portion 105 and functions as a movement restricting unit that regulates the movement of the needle hub 101 by the moving mechanism 104. Further, the engaging portion 153 acts on the movement restricting portion to function as an acting portion for releasing the movement restriction of the needle hub 101. At the second position, it functions as a locking mechanism that engages with the through hole 126 provided in the housing 102 to prevent the needle hub 101 from returning to the tip side or falling out of the housing 102. A recess that does not penetrate may be used instead of the through hole 126.

In addition to the locking mechanism in which the arm 113 engages with the through hole 126, the needle hub 101 is returned to the tip side by the elastically deformable protrusion 128 provided at the rear end portion of the housing 102 as shown in FIG. It is also possible to provide a lock mechanism for limiting the number of cases. The protrusion 128 can be a tongue-shaped flexible piece with a part of the housing 102 cut out. The protrusion 128 can be easily overcome when the inclination angle of the inclined surface on the tip side is small and the needle hub 101 comes into contact with the tip side, but the inclination angle of the inclined surface on the proximal end side is 90 ° or more. Therefore, when the needle hub 101 comes into contact with the proximal end side, it is difficult to deform and overcome. Therefore, it is possible to limit the needle hub 101 from returning from the second position to the first position.

FIG. 7 shows an example in which a notch 117 in contact with the protrusion 128 is provided in a portion of the needle hub 101 having a large diameter of the shaft portion 112. However, any configuration may be used as long as a part of the needle hub 101 comes into contact with the protrusion 128 to limit the movement. Further, in FIG. 7, an example is shown in which the protrusion 128 is provided at the center of the housing 102 and engages with the shaft portion 112 of the needle hub 101, but the position of the protrusion 128 is changed so as to engage with the arm 113. You may. Further, although the example in which the protrusion 128 is provided on the upper and lower surfaces of the housing 102 is shown, it can also be provided on the side surface of the housing 102.

The indwelling needle of the present embodiment does not directly operate the arm 113 from the outside of the housing 102 when operating the moving mechanism 104. Therefore, the arm 113 is not provided with an operation button, and the arm 113 can be made smaller, and the inner and outer diameters of the portion of the housing 102 through which the arm 113 passes can be made smaller.

In the present embodiment, an example is shown in which an arm 113 that not only engages with the operation unit 105 at the first position but also functions as a locking mechanism at the second position is provided. However, for example, instead of the arm 113, a concave portion that engages with the convex portion, which is the engaging portion 153, may be provided on the shaft portion 112. With such a configuration, the inner diameter of the housing 102 can be further suppressed as compared with the case where the arm 113 is provided. In this case, as a locking mechanism, for example, the housing 102 may be provided with an elastically deformable locking convex portion so as to engage with the concave portion of the needle hub 101. Further, in addition to the concave portion that engages with the engaging portion 153, a locking concave portion that engages with the locking convex portion may be provided. Although the example in which the engaging portion 153 of the operation button 151 is a convex portion is shown, the engaging portion may be a concave portion and engaged with the arm 113. In this case, if the shaft portion 112 can be engaged with the engaging portion which is a concave portion, the shaft portion 112 can be provided with a convex portion or the like other than the arm 113.

In the present embodiment, the housing 102 has a front portion 121 to which the wing portion 103 is attached, and a rear portion 122 provided on the proximal end side of the front portion 121 and wider than the front portion 121. .. The front portion 121 of the housing 102 has a cylindrical shape, and the rear portion 122 has a flat tubular shape in which the width in the direction in which the wing portion 103 expands is wider than the height so that the arm 113 extending laterally can pass therethrough. The outer diameter of the front portion 121 is slightly smaller than the height of the rear portion 122 in consideration of attaching the wing portion 103. 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 without a large step, it is possible to prevent the corner portion from hitting and pressing the patient's body.

In the present embodiment, the arm 113 extends toward the proximal end side. By configuring the arm 113 to extend toward the proximal end side, the maximum width portion of the needle hub 101 can be set to the rear end portion side as compared with the case where the arm 113 extends toward the distal end side. Therefore, as compared with the case where the arm 113 extends toward the tip end side, the degree of freedom in designing the length of the front portion 121 is increased, and a well-balanced indwelling needle with good operability can be realized. However, it is also possible to have an arm extending toward the tip side.

The intermediate portion 123 between the front portion 121 and the rear portion 122 is provided with a window portion 123a having an open side surface. In the window portion 123a, the upper surface and the lower surface of the housing 102 are provided with shaft holes 155 that engage with the assembly portion 154, which is a convex portion provided on the operation portion main body 150. The shaft hole 155 may be a recess instead of a through hole. The engaging portion 153 of the operating portion 105 penetrates into the housing 102 from the window portion 123a in a state where the operating button 151 is not pressed, and is leasably engaged with the arm 113 of the needle hub 101.

A resistance portion 127 may be provided between the housing 102 and the operation portion 105, which acts as a resistance to the movement of the operation portion 105 toward the housing 102 and limits the movement. By providing the resistance portion 127, the pressing force required to move the operation button 151 to the housing 102 side is increased, and it is possible to prevent the operation button 151 from malfunctioning. Further, when the pressing of the operation button 151 is stopped, the operation unit 105 can be naturally returned to the original position.

In the present embodiment, the resistance portion 127 is provided on the rear end side of the window portion 123a and is an elastic piece protruding from the side surface of the housing 102 so as to be elastically deformable. In the present embodiment, the elastic piece, which is the resistance portion 127, is formed by folding a thin plate integrated with the housing 102 into a U shape. The elastic piece is in contact with the inner surface of the operation button 151 of the operation unit main body 150. Since the elastic piece generates an outward elastic force, it becomes a resistance to the inward movement of the operation button 151. As a result, when the force applied to the operation button 151 is not more than a certain level, the engagement between the engaging portion 153 and the arm 113 is not disengaged, and malfunction can be less likely to occur. Further, the operation button 151 can be returned to the original position after pressing.

An example is shown in which the resistance portion 127 is an elastic piece formed integrally with the housing 102, but a small piece of an elastic member such as resin or metal is inserted between the housing 102 and the operation portion 150 to form the resistance portion 127. You can also do it. The elastic piece is not limited to a plate-like body, but can also be formed by a linear body such as a wire. Further, an elastic member such as a compressible rubber formed into a block shape can be used, or a coil spring or the like can be used. In the present embodiment, an example in which the elastic piece extends toward the proximal end side is shown, but a configuration in which the elastic piece extends toward the distal end side may also be used. Further, the elastic piece can be fixed not to the housing 102 side but to the operation unit 105 side.

Furthermore, instead of inserting an elastic member or the like inside the operation part to resist the movement of the operation button inside the resistance part, a spring member such as a pinch ring is installed outside the operation part. However, the structure may be such that it acts as a resistance to the movement of the outside of the engaging portion.

In this embodiment, an example is shown in which the operating portion 105 has an engaging portion 153 that engages with the needle hub 101. However, as shown in FIG. 8, the needle hub 201 may be engaged with the housing 202, and the operating unit 205 may be configured to release the engagement.

As shown in FIG. 8, the indwelling needle according to the modified example has an arm 213 in which the needle hub 201 engages with the housing 202. The operation unit 205 is provided with an operation button 251 and is rotatably fixed to the housing 202 via an assembly portion 254 whose first end is a fulcrum shaft, and a second end which is an action unit 253 is an arm. It has an operation unit main body 250 arranged at a position corresponding to 213. When the operation button 251 is pressed inward, the second end portion of the acting portion 253 moves from the standby position to the inner operating position and presses the end portion of the arm 213. As a result, the engagement between the arm 213, which is the movement restricting unit, and the housing 202 is released, the movement mechanism 204 is activated, and the needle hub 201 moves from the first position to the second position. 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 202. The moving mechanism 204 may be a coil spring arranged between the needle hub flange 215 provided on the needle hub 201 and the housing flange 225 provided at the tip of the housing 202.

In this modification, an example is shown in which the arm 213 is engaged with the edge of the window portion 223a. However, for example, the end of the arm 213 may be engaged with a through hole provided in the housing 202. Further, in FIG. 8, an assembly portion 254, which is a fulcrum shaft, is provided at the end portion on the base end side to serve as a fixed portion, and a movable second end portion serving as the working portion 253 is located on the tip side of the fixed portion. showed that. As a result, the housing can be made smaller than when the working portion is on the proximal end side of the fixed portion. However, the working portion may be located closer to the proximal end side than the fixed portion. In this modified example, an example in which the arm extends toward the proximal end side is shown. However, the arm may be configured to extend toward the tip side.

Also in this modified example, various configurations shown above can be adopted as the connection mechanism between the operation unit main body 250 and the housing 202. Further, as for the lock mechanism and the like at the second position, various configurations shown above can be adopted. Further, various configurations shown above can be adopted for the resistance portion.

In the examples and modifications, the operation unit extends in the needle axis direction, but the operation unit may extend in the vertical direction. Further, although an example in which the operation portion is attached to the housing is shown, it may be provided on a component other than the housing such as a wing portion, or may be provided integrally with these components.

In the embodiment and the modified example, an example is shown in which a resistance portion is provided between the operation portion and the housing so that the rotation of the operation portion receives resistance and malfunction is reduced. However, instead of causing the rotation of the operating portion to receive resistance, for example, as shown in FIG. 9, the rotation of the arm 113, which is a movement restricting portion provided on the needle hub 101, receives resistance. A resistance portion 118 may also be provided. In FIG. 9, the resistance portion 118, which is a resistance to the rotation of the arm 113, is a flexible piece provided inside the arm 113, but has various configurations like the resistance portion, which is a resistance to the rotation of the operation portion 105. Can be used.

FIG. 8 shows an example in which the operation unit 205 is assembled to the housing 202 via the assembly unit 254. However, as shown in FIG. 10, the operation unit 205 is configured to have an operation unit integrated with the housing. You can also do it. In this case, it is not necessary to provide the resistance portion 227 that regulates the movement of the operation button 251.

In the modified example shown in FIG. 10, the operation unit 305 and the housing 302 are integrally molded bodies. Specifically, the operation unit main body 350 of the operation unit 305 has a flat U-shape integrally formed so as to be connected to the housing 302 at the first end portion. The second end of the operation unit body 350 is a free end that serves as an action unit 353, and is arranged at a position corresponding to the arm 313 that is a movement restricting unit. When the operation button 351 provided on the operation unit main body 350 is pressed inward (toward the housing 302), the second end of the action unit 353 is set as a fulcrum with the first end of the fixing portion fixed to the housing 302 as a fulcrum. The part rotates inward and moves from the standby position to the operating position. As a result, the end of the arm 313 provided on the needle hub 301 is pressed, the engagement between the arm 313 and the housing 302 is released, the moving mechanism 304 is activated, and the needle hub 301 is moved from the first position. Move to the second position. The fixed portion of the operating portion 305 is located on the base end side of the housing 302, and the operating portion 305 is provided so as to have a length of about 10 mm to 35 mm in the direction of the tip substantially from the fixed portion, so that the indwelling needle can be handled easily. It is possible to achieve both miniaturization. Further, if it is desired to increase the pressure required to press the operation button 351, the operation unit 305 may be made thicker.

The moving mechanism 304 can be a coil spring arranged between the needle hub flange 315 provided on the needle hub 301 and the housing flange 325 provided at the tip of the housing 302.

In the modified example shown in FIG. 10, the configuration in which the arm 313 extends toward the tip end is shown. By doing so, it is possible to facilitate the position of the acting portion acting on the movement restricting portion in the operating portion on the tip side. However, the arm may be configured to extend toward the proximal end side. Further, the arm 313 is provided on the proximal end side of the wing portion, and by doing so, the process from puncture to operation of the moving mechanism can be smoothly performed, which is preferable. Further, in this modified example, an example in which the arm 313 is engaged with the edge of the window portion 323a is shown. However, for example, the end of the arm 313 may be engaged with a through hole provided in the housing 302.

As for the operation part, as in this modification, it is better to position the action part that acts on the movement control part by bending inward on the tip side of the fixed part fixed to the housing to prevent malfunction. It is advantageous in that. However, as will be described later in FIG. 12, by devising the specifications, it is possible to make the acting portion acting on the movement regulation of the needle hub located closer to the proximal end side than the fixed portion fixed to the housing.

In FIG. 10, an example is shown in which the working portion 353 of the operating portion 305 is in contact with the end portion of the arm 313 which is the movement restricting portion at the standby position. However, as shown in FIG. 11, at the standby position, the acting portion 353 of the operating portion 305 may not be in contact with the end portion of the arm 313 which is the movement restricting portion. With such a configuration, when the acting portion 353 of the operating portion 305 is first moved to a position where it comes into contact with the arm 313 which is the movement restricting portion, and then the arm 313 is pressed, the engagement of the arm 313 is engaged. Can be released. Therefore, it is possible to further reduce the malfunction of the moving mechanism 304. The distance between the acting unit 353 of the operating unit 305 and the end of the arm 313, which is the movement restricting unit, in the standby position uses the contact between the operating unit 353 and the arm 313 when the operation button 351 is pressed. From the viewpoint of making it perceptible to a person, 0.3 mm or more is preferable. Further, 0.8 mm or more is preferable from the viewpoint of allowing the user to feel that the operation button has moved when the operation button 351 is pressed. Further, it is preferably 8.0 mm or less from the viewpoint of reducing the load applied to the fixed portion when the operation button 351 is pressed to bend the operation portion 305 and making it less likely to be damaged. Further, it is more preferable that the operation button 351 is 3.5 mm or less from the viewpoint of being arranged at a position where the operation button 351 is easily pinched according to the size of the hand. The value of the distance between the acting portion 353 and the end portion of the arm 313 is a value measured in a direction orthogonal to the needle axis direction.

Further, it is preferable that the acting portion 353 of the wing portion 103 and the operating portion 305 is located on the tip end side of the housing 302, and the acting portion 353 of the operating portion 305 is near the wing portion 103. It is more preferable that the working portion 353 of the operating portion 305 is located on the notch provided at the base end portion of the wing portion 103 from the viewpoint (in-place needle plan view) as shown in FIG. Further, the tip surface and the base end surface of the portion of the arm 313 that is hooked on the housing 302 have a tapered shape so that the wall thickness increases toward the outside. Further, the through hole provided in the housing 302 on which the arm 313 is hooked after the operation of the moving mechanism 304 also has a tapered shape at the tip end surface and the base end surface of the through hole so that the space becomes larger toward the outside. By doing so, it is possible to prevent the housing 302 and the needle hub 301 from being separated from each other after the movement mechanism 304 is operated. The needle is exposed by making the force required to separate the tube 106 and the needle hub 301 smaller than the force required to separate the housing 302 and the needle hub 301 after the movement mechanism 304 is activated. The risk of accidents can be reduced. Further, before the operation of the moving mechanism 304, the surface of the housing 302 on which the arm 313 is hooked is tapered inward toward the tip side to increase the engaging force with the arm 313, thereby further preventing malfunction. be able to.

8 to 11 show an example in which the first end portion of the operating portion is a fixed portion fixed to the housing and the second end portion is an acting portion acting on the movement restricting portion. A portion other than the fixed portion or the acting portion may be used. For example, the convex portion protruding from the middle of the operating portion may be an acting portion that presses the arm 313.

Further, in the operation portion of FIG. 11, the fixed portion is the end on the proximal end side. However, by providing a protrusion or the like extending further toward the proximal end side than the fixed portion, it is possible to prevent the finger from slipping toward the proximal end side. The operation button can be miniaturized by providing it between the fixed portion fixed to the housing and the acting portion.

An operation unit having a configuration in which the first end portion of the operation unit main body is fixed to the housing and the second end portion is moved inward by pressing the operation button inward is shown in FIG. As described above, the operation unit may be configured such that the second end portion moves outward.

In the modified example shown in FIG. 12, the operation unit main body 450 of the operation unit 405 is integrally formed with the housing 402, and is integrally connected to the housing 402 between the engagement portion 453 and the operation button 451. By pressing the operation button 451 inward, the portion of the operation unit main body 450 connected to the housing 402 becomes a fulcrum, and the engaging portion 453 that has penetrated into the housing from the window portion 432a rotates outward. As a result, the engagement between the engaging portion 453 and the arm 413 provided on the needle hub 401 is released, and the moving mechanism 404 operates.

As in the modified example shown in FIGS. 10 to 12, the operation portion main body is integrally formed with the housing, and the action portion acting on the movement restricting portion is located on the tip side of the fixed portion fixed to the housing. For example, the number of parts is reduced and manufacturing becomes easier as compared with the case where the housing is connected to the housing via an assembly portion. In addition, by optimizing the shape and material, the pressing force applied to the operation button to operate the operation part can be adjusted to an appropriate size, and a resistance part or the like can be provided between the operation part and the housing. Even if it is not provided, it is possible to prevent malfunction of the moving mechanism.

1 to 12 show an example in which the needle hub does not protrude from the tip of the housing. With such a configuration, there is an advantage that the tip of the needle hub comes into contact with the inner surface of the housing flange and the movement of the needle hub toward the tip can be restricted. However, the method of restricting the movement of the needle hub to the tip side is not limited to this, and as shown in FIG. 13, the needle hub 501 is projected from the housing 502, and as shown in FIG. 14, the needle hub 501 and the housing 502 are formed. , The stepped portions 561 and 562 that engage with each other can be provided, respectively. By providing the stepped portions that engage with each other, the movement of the needle hub 501 toward the tip end side can be restricted. The step portion 561 can be formed by making the outer diameter of the needle hub 501 on the proximal end side larger than that on the distal end side, and the step portion 562 can be formed by making the inner diameter of the housing 502 on the distal end side smaller than that on the proximal end side. .. Further, the tip direction restricting portion may be formed by providing a protrusion or the like that engages with each other instead of the step portion, or by providing a protrusion or the like that contacts the inner surface of the housing flange on the needle hub. May be brought into contact with each other to form a tip direction regulating portion.

As shown in FIG. 15, the height of the front end side of the window portion 523a can be made lower than that of the proximal end side to reduce the play in the window portion 523a of the arm 513. When the height of the window is gradually lowered, the arm is engaged with the window as compared with the case where the axial length of the window is shortened to reduce the play in the window of the arm. It becomes easy. It is preferable that any part of the needle hub excluding the arm is brought into contact with the housing to form the tip direction regulating portion, and in consideration of the regulating force, the step portion is preferably used as the tip direction regulating portion. In this case, the movement of the needle hub on the tip end side can be reliably regulated, and the window portion 523a can be enlarged, so that the product can be easily manufactured.

In the present embodiment and the modified example, the puncture needle 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.

In the present embodiment and the modified example, the needle hub 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 and the arm can be integrally molded. The puncture needle can be fixed to the needle hub by using an adhesive, welding, welding, or the like. The tube connected to the base end side of the needle hub can be a flexible resin tube. Further, a connector or the like can be connected to the base end of the tube.

In the present embodiment and the modified example, the moving mechanism may have any configuration as long as the needle hub can be moved 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 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.

In this embodiment and the modified example, the housing 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 outer diameter of the front portion is not particularly limited, but is preferably about 2 mm to 5 mm from the viewpoint of operability. The rear portion preferably has a flat shape having a height smaller than the width. For example, the width can be about 8 mm to 18 mm and the height can be about 3 mm to 6 mm. Keeping the height low has the advantage of facilitating fixation to the patient's body. When the flat shape is used, the diameter of the front portion and the height of the rear portion can be substantially matched, which has the advantage of facilitating fixing. However, the rear portion does not have to be flat, and may be cylindrical, for example. Further, the front portion may also have a flat shape instead of a cylindrical shape.

By arranging the operation units having the operation buttons on both sides of the housing, the movement of the needle hub by the movement mechanism can be started when both operation buttons are operated. With such an arrangement, it is possible to prevent malfunctions due to vibration during transportation or a finger or the like hitting the operation buttons, as compared with the case where there is only one operation button. By providing the operation button on the housing side, unlike the case where the arm etc. provided on the needle hub and the operation button are integrated, even if two operation buttons are provided, the inner diameter of the part through which the arm of the housing passes is sufficient. Can be kept small. The number of operation buttons may be only one. In this case, the arm can also be made into one corresponding to the operation button.

In the present embodiment and the modified example, the wing portion 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 may be provided with irregularities or the like to facilitate gripping or fixing to the patient's body. For example, the wing portion has a structure having a tubular outer fitting portion that is outerly fitted to the front portion, and can be attached by being outerly fitted to the front portion. However, the present invention is not limited to this, and any configuration may be used as long as it can be attached to the housing. Further, the structure may have a wing portion that extends only on one side, or the wing portion may be integrally molded with the housing. Further, it is possible not to provide a wing portion. In this case, since the portion closer to the needle of the housing can be gripped, the stability at the time of puncture can be improved. It is also possible to provide gripping portions such as dents on both side surfaces of the housing for gripping with fingers at the time of puncture so that the top surface of the housing can be easily pressed with fingers.

In the embodiment and the modified example, the needle hub is assembled to the housing so that the hole at the tip of the needle faces the top surface of the housing, and the operation portion is provided on the side surface of the housing. By doing so, the skin puncture resistance can be minimized, and the situation where the operating portion is unintentionally pressed when the entire indwelling needle is pressed against the skin after puncture can be reduced. In addition, the operation unit shows an example in which the wing portion expands in a direction (horizontal direction) that coincides with the expansion direction. By doing so, it is possible to reduce the risk of an external force being applied to the operating portion by the amount of the wing portion during transportation.

When the acting portion that acts on the movement restricting portion is provided on the tip side of the fixed portion as shown in FIGS. 8, 10 and 11, it is preferable that the acting portion is located in the vicinity of the wing portion. By placing the working portion in the vicinity of the wing portion, it is possible to prevent an erroneous operation such as grasping the working portion.

For example, in FIG. 10, the second end portion of the operating portion 353 of the operating portion 305 can be located closer to the tip end side than the base end of the wing portion 103. That is, the most distal portion of the operating portion 353 can be located closer to the distal end than the proximal end of the wing portion. Further, a notch can be provided at the base end of the wing portion 103 so that the acting portion 353 exists on the notch of the wing portion 103 in a plan view as shown in FIG. In this way, it is possible to prevent an erroneous operation such as gripping the acting portion 353 from occurring. The operation unit 305 can also extend beyond the notch to the wing portion 103. In this case, the operation button 351 is located between the wing 103 and the fixed portion so that the wing 103 does not touch the operation button 351 when the wing 103 is gripped and the wing 103 is bent. It is preferable to have. Although the configuration shown in FIG. 10 has been described, the same modification can be performed in the configurations shown in FIGS. 8 and 11.

The operation button extends from the side surface of the housing, so that the hand can be prevented from unintentionally touching the working part from the time of packaging to the time of use. The wing portion may be one wing, and in that case, the operation portion is preferably provided on the side where one wing is provided.

Further, an operation unit disabling unit may be provided that makes the operation unit inoperable until it is removed. In such an operation portion disabling portion, for example, a removable hard member is provided between the operation button and the housing, or the hard member is detachably attached so as to cover the operation portion. This can be achieved by preventing the operation buttons from being pressed until they are removed. The operation button is a portion where the movement restriction of the needle hub by the movement restriction portion can be released by pressing with a finger, and it is not necessary to provide unevenness or the like. Further, by providing the operation button on the side surface of the housing, it is possible to prevent malfunction during transportation in cooperation with the wing portion.

In the present embodiment and the modified example, the movement restricting unit is an arm protruding from the needle hub, but another configuration may be adopted as long as the movement of the needle hub can be regulated so as to be released. Further, by providing a plurality of movement control units, it is possible to make it more difficult for malfunctions to occur.

In the above embodiments and modifications, the operation button is independent of the movement control unit, but the operation button and the movement control unit may be integrated. In this way, the number of parts can be reduced and assembly becomes easy.

As shown in FIGS. 17 and 18, the indwelling needle according to this modification has a thick operation button 113B at the end side provided on the needle hub 101. 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 to the shaft portion 112 side, and the engagement with the edge of the window portion 123a is released.

In this modification, 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.

Also in this modification, in order to prevent the needle hub 101 from returning to the tip side or falling off from the housing 102 after the needle hub 101 has moved to the second position, the above-described embodiments and A locking mechanism similar to that of the modified example can be provided. Further, at least a part of the arm 113 may be projected from the rear end of the housing 102, thereby preventing the needle hub 101 from returning from the second position to the tip side. For example, as shown in FIG. 19, 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. By preventing the needle hub 101 from moving to the tip end side at the second position by the arm 113, there is an advantage that the configuration of the movement preventing means becomes simpler than that by the shaft portion 112. Further, since the length of the rear portion 122 of the housing 102 can be shortened, the operability at the time of puncturing can be further improved. In addition, also in the embodiment and the modification shown above, at least a part of the arm 113 may be configured to protrude from the rear end of the housing 102.

In this modified example, 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. 20, the arm 113 may be configured to extend toward the tip end side.

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.

When the arm 113 and the operation button 113B are integrated, the rear portion 122 may have a width of 7.0 mm or more and 10 mm or less and a height of 4.5 mm or more and 5.5 mm or less, for example. it can. The front portion 121 can be the same as the embodiment and the modified example shown above.

In this modified example, the same wing configuration as in the above-described embodiment and modified example for preventing erroneous operation, a configuration for preventing the needle hub from moving to the tip side at the first position, and the like are adopted. can do.

The indwelling needle of the present disclosure can be less likely to cause a malfunction and is useful as an indwelling needle or the like.

101, 201, 301, 401, 501 Needle hub 102, 202, 302, 402, 502 Housing 103 Wing 104, 204, 304, 404, 504 Moving mechanism 105, 205, 305, 405 Operation part 106 Tube 111 Puncture needle 112 Shaft 113, 213, 313, 413, 513 Arm 113A End 113B Operation button 115, 215, 315 Needle hub flange 117 Notch 121 Front 122 Rear 123 Intermediate 123a, 223a, 323a, 423a, 532a Window 125 , 225, 325 Housing flange 126 Through hole 127, 227 Resistance part 128 Protrusion 150, 250, 350, 450 Operation part main body 151, 251, 351, 451 Operation button 153, 453 Engagement part 154, 254 Assembly part 155 Shaft hole 253 353 Acting part 561 Step part 562 Step part

Claims (7)

A needle hub to which a puncture needle with a diagonally cut tip is fixed,
The wing that extends in the direction that intersects the needle axis direction,
A housing for accommodating the needle hub and
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.
It is provided with an operation unit that operates the moving mechanism.
The needle hub has a movement restricting unit that restricts movement from the first position against the movement mechanism so as to be released.
The movement restricting portion has an arm that extends from the side surface of the needle hub and is releasably engaged with the housing.
The operation unit
Before SL has an operating portion body extending spaced outwardly relative to said housing toward the tip end side from the fixed end that will be fixed to the housing, and a working portion on the inner surface of the operation portion main body,
The axial length of the arm is shorter than the axial length from the fixed end of the operating portion to the acting portion.
By moving the acting portion from the standby position to the inner operating position with the fixed end as a fulcrum, the acting portion presses the arm inward to release the movement restriction by the arm , and the moving mechanism is moved. Indwelling needle to operate. The indwelling needle according to claim 1, wherein the operating portion is provided on both side surfaces of the housing. The indwelling needle according to claim 1 or 2, wherein the acting portion is located between the wing portion and the fixed end . The indwelling needle according to claim 1 or 2, wherein the wing portion has a notch provided at a base end portion, and the action portion is located at the notch portion. Any of claims 1 to 4, wherein when the restriction by the movement restricting unit is released, the acting unit moves from a standby position that is not in contact with the movement restricting unit to an operating position that presses the movement restricting unit. The indwelling needle according to item 1. Said arm, said Ru extending from a side surface of the needle hub in the distal direction, indwelling needle according to any one of claims 1 to 5. Claims 1 to 1, wherein the arm has a convex end portion that engages with the housing, and the convex portion has a tapered tip surface and a base end surface so as to become thicker toward the outside. The indwelling needle according to any one of 6.

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