JP2016107044A - Medical needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical needle in which, unexpected re-projection of a needle tip can be prevented, and disposal can be safely performed after use.SOLUTION: A medical needle 100 comprises: a base part 20 having a needle hole 22; a needle body 10 having an acute needle tip 11; a connection mechanism 50 for connecting the needle body 10 to the base part 20, so that the needle body can be pulled up; and a lid part 60 for closing the needle hole 22. In the medical needle 100 in an initial state, the needle tip 11 of the needle body 10 projects from the needle hole 22. The lid part 60 is driven, in linkage with an operation for pulling up the needle body 10 from the base part 20 and retreating the needle tip 11 relative to the needle hole 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medical needle.

  Various puncture needles for medical use are provided. As an example, there is provided a medical needle called a port needle that punctures an access port implanted under the skin and supplies a liquid such as a drug solution or a nutrient solution.

  This type of medical needle is provided with a safety device that locks the needle body with the needle tip protected by a member in order to protect the needle tip and safely dispose of it after use in the procedure. There is something.

  Patent Document 1 describes a medical needle in which a needle tip is housed in an inner bearing and protected by pulling up a needle body from a contact surface (base portion). As shown in FIGS. 5 and 13 of Patent Document 1, when the needle body is pulled up and the needle tip is received in the needle hole inside the inner bearing, the wedge-shaped portion (cam) is pressed from the side. Close contact with the needle tip. Then, the wedge-shaped portion latches and the downward movement of the inner bearing is restricted, so that the needle tip is restricted from re-projecting downward from the inner bearing and the outer bearing.

  Patent Literature 2 describes a medical needle in which a needle tip is accommodated in a needle tip protecting portion by pulling up a needle body from a wing portion (base portion). In FIG. 9 of Patent Document 2, the needle tip protection portion rotates with respect to the wing portion by the needle body lifting operation and moves to the side of the needle hole. A mode of being pushed into the tip protection part is described. Since the needle tip housed in the needle tip protecting portion is elastically restored from the bent state, it is restricted from re-projecting from the needle tip protecting portion.

Special table 2007-511285 gazette International Publication No. 2007/126085 Pamphlet

  In recent years, there has been a demand for further safety in the handling of medical devices, and there is a need for a medical needle that can prevent the needle tip from unexpectedly re-projecting even if a user performs an erroneous operation or an incomplete operation. .

  However, in the medical needle of Patent Document 1, if the length of pulling up the needle body from the contact surface (base portion) is insufficient and the wedge-shaped portion latch is incomplete, the needle tip re-projects below the inner bearing. There is a case. This is because the wedge-shaped portion pressed against the side of the needle body is elastically restored when the latch is incomplete and loses the regulating force of the needle body, and the inner bearing descends together with the needle body.

  Further, the medical needle of Patent Document 2 needs to bend by applying an elastic force to the needle tip when the needle body is pulled up from the wing (base) and the needle tip is pulled into the needle tip protecting portion. For this reason, if the pull-in of the needle body is incomplete, the needle tip may jump out of the needle tip protector due to the elastic restoring force, and further re-project downward from the needle hole.

  The present invention has been made in view of the above-described problems, and provides a medical needle that can be safely disposed of after use by preventing the needle tip from re-projecting unexpectedly. Is.

  According to the present invention, a base portion having a needle hole, a needle body having a sharp needle tip, the needle tip projecting from the needle hole, and the needle body is lifted with respect to the base portion. A medical mechanism comprising: a coupling mechanism that couples the needle body; and a lid portion that is driven in conjunction with an operation of pulling up the needle body from the base portion and retracting the needle tip from the needle hole to close the needle hole. A needle is provided.

  According to the above invention, the lid closes the needle hole in conjunction with the operation of pulling up the needle body from the base portion and retracting the needle tip from the needle hole, so that the needle tip is prevented from unexpectedly re-projecting, It is possible to safely dispose of after use.

It is a side view which shows the puncture state of the medical needle concerning 1st embodiment of this invention. It is the longitudinal cross-sectional view which cut | disconnected the medical needle of the puncture state shown in FIG. 1 along the needle body. It is a side view which shows the extraction state of the medical needle concerning 1st embodiment of this invention. It is the longitudinal cross-sectional view which cut | disconnected the medical needle of the extraction state shown in FIG. 3 along the needle body. It is an enlarged view which shows the vicinity of the cover part in the medical needle of the extraction state. It is a perspective view which shows the cover part and connection mechanism in a puncture state. It is a perspective view which shows the cover part and connection mechanism in a transition state. It is a perspective view which shows the cover part and connection mechanism in an extraction state. It is a side view which shows the puncture state of the medical needle concerning 2nd embodiment of this invention. It is a top view which shows the puncture state of the medical needle concerning 2nd embodiment of this invention. It is a front view which shows the puncture state of the medical needle concerning 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, corresponding constituent elements are denoted by common reference numerals, and redundant description is omitted as appropriate.

  FIG. 1 is a side view showing a puncture state of the medical needle 100 according to the first embodiment of the present invention. The puncture state of the medical needle 100 is a state in which the needle 10 is punctured on the body wall or the like of the subject and the medical needle 100 is indwelled, and is a use state in which the medical needle 100 is used for a procedure. . Hereinafter, the puncture state may be referred to as an initial state. FIG. 2 is a longitudinal sectional view of the medical needle 100 in use as shown in FIG. 1 cut along the needle body 10.

  FIG. 3 is a side view showing the extracted state of the medical needle 100 according to the first embodiment of the present invention. FIG. 4 is a longitudinal sectional view of the medical needle 100 in the extracted state shown in FIG. 3 cut along the needle body 10. The extracted state of the medical needle 100 means that the needle body 10 is retracted from the needle hole 22 than the puncture state and the needle tip 11 is accommodated in the needle hole 22 or the needle tip 11 is above the needle hole 22. It is in a state that has been removed.

  In this specification, the movement of the needle tip 11 in the direction protruding from the needle hole 22 is referred to as the needle body 10 or the needle tip 11 moving forward. Conversely, the movement of the needle tip 11 into the needle hole 22 or the movement of the needle tip 11 in the direction of being pulled out above the needle hole 22 is referred to as the needle body 10 or the needle tip 11 retreating. The medical needle 100 that has been used for the procedure and has been removed is combined with the form shown in FIG. 3 or a state in which the medical needle 100 is further deformed from the form and other members (not shown). In state, discarded.

  In this specification, the puncture direction of the needle body 10 may be referred to as “downward”, and the removal direction of the needle body 10 may be referred to as “upward”, but this is defined for convenience in order to explain the relative relationship of the components. The direction at the time of manufacture and use of the product according to the present invention is not necessarily limited. Further, in the medical needle 100, the side on which the liquid feeding tube 46 extends may be referred to as a proximal side, and the opposite side may be referred to as a distal side. The right side in FIGS. 1 to 4 corresponds to the proximal side, and the left side corresponds to the distal side. 1 to 4 is referred to as the width direction of the medical needle 100.

  First, the outline | summary of the medical needle 100 of this embodiment is demonstrated. The medical needle 100 includes a base portion 20 having a needle hole 22, a needle body 10 having a sharp needle tip 11, a connecting mechanism 50 for connecting the needle body 10 to the base portion 20 so as to be lifted, and a needle hole. And a lid 60 that closes 22. In the initial state of the medical needle 100 shown in FIGS. 1 and 2, the needle tip 11 of the needle body 10 is provided so as to protrude from the needle hole 22. As shown in FIGS. 2 and 4, the lid portion 60 is driven in conjunction with an operation of pulling up the needle body 10 from the base portion 20 and retracting the needle tip 11 from the needle hole 22.

  Next, this embodiment will be described in detail.

  The medical needle 100 of the present embodiment is a port needle that can puncture a needle body 10 into an access port (not shown) implanted under the skin of a subject and supply a liquid such as a drug solution or a nutrient solution. . The medical needle 100 of the present embodiment may be used by puncturing the needle body 10 with respect to various medical devices installed outside the body of the subject, in addition to the access port embedded under the skin.

  The medical needle 100 of the present embodiment includes a flat plate-shaped or curved plate-shaped contact portion 30 that is used while being in contact with the surface (body surface) of a living tissue such as the skin surface of a subject. By joining the contact portion 30 to the body surface of the subject using an adhesive tape (not shown) or the like, the medical needle 100 can be fixed in a state where the needle body 10 is punctured into the body wall of the subject. The contact portion 30 illustrated in the present embodiment is curved three-dimensionally in a dome shape. More specifically, the contact portion 30 of the present embodiment has a partial spherical shape and opens downward from FIG. 1 to FIG. In the puncture state shown in FIGS. 1 and 2, the needle body 10 passes through the contact portion 30 toward the center of the partial spherical surface. Accordingly, the contact portion 30 can be brought into close contact with the body wall in a state where the needle body 10 is punctured with respect to the body wall slightly bulged with the access port embedded therein. The contact part 30 has flexibility and can be deformed following the raised shape of the body wall. The contact portion 30 is made of, for example, a thermoplastic synthetic rubber material such as silicone rubber, urethane rubber, or styrene / butadiene rubber.

  As shown in FIGS. 2 and 4, the contact portion 30 is formed with a cut portion 36. The cut portion 36 extends inwardly from the circular peripheral edge of the contact portion 30. Although the position and quantity of the notch part 36 are not specifically limited, In this embodiment, the notch part 36 is formed on both sides of the needle body 10. By forming the cut portion 36 in the contact portion 30, the user can easily reverse the front and back by grasping the dome-shaped contact portion 30. Accordingly, when the needle body 10 of the medical needle 100 is punctured into the body wall or medical device of the subject, the contact portion 30 can be used as a wing-shaped knob, and the needle tip 11 of the needle body 10 can be used. It is exposed greatly from the contact portion 30 and the visibility is improved.

  A base portion 20 is provided on the top of the dome-shaped contact portion 30. More specifically, an attachment hole 32 is formed at the top of the contact portion 30, and a lock member 34 is fitted in the attachment hole 32. The base portion 20 is mounted on the upper surface side of the lock member 34 and is locked to the lock member 34 and the contact portion 30.

  The base portion 20 is configured by combining a pair of base halves 21a and 21b in the width direction (see FIGS. 6 to 8 for the base half 21b). Engagement protrusions 28, which will be described later, are integrally formed on the base half body 21a disposed on one side in the width direction (the front side in FIG. 1 to FIG. 4). A bottom plate portion 29 (see FIG. 4) constituting the lower end opening 23 of the needle hole 22 is integrally formed on the base half body 21b arranged on the other side in the width direction (the depth side in FIG. 1 to FIG. 4). Yes. The base halves 21a and 21b have bearing holes 27 into which the hinge portions 57 formed in the coupling mechanism 50 are rotatably fitted. The base half body 21a and the base half body 21b are joined and fixed to each other in a state where the coupling mechanism 50 is sandwiched and the hinge portion 57 is fitted in the bearing hole 27.

  The base portion 20 (base halves 21 a and 21 b) of the present embodiment is composed of one or a plurality of parts made of a material harder than the contact portion 30 and has a needle hole 22. As an example, the base portion 20 can be made of a resin material such as polypropylene or hard vinyl chloride, or a metal material.

  The needle hole 22 extends in the forward / backward direction of the needle body 10, that is, in the vertical direction. The needle hole 22 of the present embodiment is a through hole formed inside the base portion 20. The base halves 21a and 21b are each formed with a notched portion having a half cylindrical shape, and the needle hole 22 is configured by combining these notched portions. However, instead of this embodiment, the needle hole 22 is a notch formed around the base portion 20, and extends between the base portion 20 and other members such as the lock member 34 and the contact portion 30. The needle hole 22 may be formed through.

  In addition, although the base part 20 and the contact part 30 are created as a separate member in this embodiment, the aspect connected with each other by the lock member 34 is illustrated, but this invention is not limited to this. For example, the base part 20 and the contact part 30 may be integrally formed with one material. In other words, the base portion 20 may be formed in a dome shape, and the needle hole 22 may be formed in the top of the head.

  As shown in FIG. 4, the base portion 20 has a recess 25 inside. The recess 25 has a bottomed shape having a bottom surface 26, and a needle hole 22 is formed through the bottom surface 26. The lid 60 is fitted into the recess 25 in conjunction with the operation of retracting the needle tip 11 from the needle hole 22. Accordingly, the lid 60 closes the needle hole 22 and prevents the needle tip 11 from being lowered and reinserted into the needle hole 22. Therefore, the needle tip 11 does not protrude again from the base portion 20. Here, the needle hole 22 being closed means that a part or all of the opening of the needle hole 22 is closed and the needle body 10 cannot pass through the needle hole 22. In the medical needle 100 of the present embodiment, the entire opening of the needle hole 22 is closed by the lid 60 in the removed state. This completely prohibits the needle tip 11 from re-entering the needle hole 22 and projecting downward, in other words, the medical needle 100 is prevented from transitioning from the removed state to the puncture state.

  The lid 60 is inserted between the needle tip 11 and the needle hole 22 when the needle tip 11 is removed from the needle hole 22 and closes the needle hole 22. Thus, the lid 60 prohibits the needle tip 11 removed from the needle hole 22 from entering the needle hole 22 again. A series of specific operations until the lid 60 is fitted in the recess 25 will be described later with reference to FIGS.

  The lid portion 60 of this embodiment is not pressed against the needle body from the side like the wedge-shaped portion of the medical needle of Patent Document 1, but is inserted between the needle tip 11 and the needle hole 22. The needle tip 11 is prohibited from re-projecting from the needle hole 22 without specially locking the removed needle body 10. Further, the lid 60 prohibits the re-protrusion of the needle tip 11 without elastically deforming the needle tip unlike the needle tip protecting portion of Patent Document 2. Therefore, according to the medical needle 100 of the present embodiment, unlike the medical needles of Patent Document 1 and Patent Document 2, the needle tip 11 unexpectedly re-projects even if the user performs an erroneous operation or an incomplete operation. Is prevented.

  In the puncture state of the medical needle 100, the needle tip 11 of the needle body 10 protrudes below the lower end opening 23 of the needle hole 22 (see FIG. 2). At this time, the lid 60 is retracted to a position different from the position directly above the needle hole 22. Specifically, the lid 60 is located above the recess 25 and ahead of the needle hole 22.

  Then, the needle tip 11 of the needle body 10 is positioned above the lower end opening 23 of the needle hole 22 in a state in which the needle 10 is pulled up and the connecting mechanism 50 is removed from the base portion 20 and the medical needle 100 is removed. The needle tip 11 is located inside the needle hole 22 or above the needle hole 22 (see FIG. 4). In the medical needle 100 of the present embodiment, the needle tip 11 is positioned above the upper end opening 24 (see FIG. 5) of the needle hole 22 in the removed state, that is, the needle body 10 is retracted from the needle hole 22 and completely. Is in a state of being removed. At this time, part or all of the lid 60 is fitted into the recess 25 to close the needle hole 22.

  FIG. 5 is an enlarged view showing the vicinity of the lid 60 in the medical needle 100 in the extracted state. The needle tip 11 of the needle body 10 is pulled up above the needle hole 22, and the lid 60 is inserted between the needle tip 11 and the needle hole 22 to close the needle hole 22.

  When the medical needle 100 is removed as shown in the figure, the lid 60 abuts on the upper end side (bottom surface 26) of the needle hole 22 to close the needle hole 22. That is, the lid 60 is in close contact with the upper end of the needle hole 22 without any gap and closes the needle hole 22. For this reason, even if the needle tip 11 is pressed against the upper surface 61 of the lid portion 60 in the removed state, the lid portion 60 supported below the bottom surface 26 does not move easily, and the lid portion 60 is stably stabilized in the needle hole 22. Close.

  More specifically, the depth dimension D of the recess 25 of this embodiment is larger than the thickness dimension T of the lid 60. In the state where the medical needle 100 is removed as shown in FIG. As a result, the lid 60 fitted into the recess 25 in a state where the medical needle 100 is removed is not easily detached from the recess 25.

  The lid 60 has an upper surface 61 and a lower surface 62. The upper surface 61 is a surface that faces the needle tip 11 when the lid portion 60 is inserted between the needle tip 11 and the needle hole 22. Similarly, the lower surface 62 is a surface facing the needle hole 22 when the lid portion 60 is inserted between the needle tip 11 and the needle hole 22. As shown in FIG. 5, at least part of the ridgeline (ridgeline 63) of the lower surface 62 of the lid portion 60 is formed with a chamfered portion having a larger radius of curvature than that applied to the ridgeline of the upper surface 61 of the lid portion 60. Has been.

  The ridgeline around the upper surface 61 in the lid 60 may be formed with a chamfered portion having a smaller radius of curvature than the chamfered portion formed on the ridgeline 63, or formed sharply without having a chamfered portion. It may be.

  The ridge line 63 is an edge on the front end side that is separated from the hinge portion 57 in the lower surface 62 of the lid portion 60, and extends in the width direction (the front-rear direction in FIG. 5). By forming a large chamfered portion on the ridge line 63, the lid portion 60 that has been retracted from the needle hole 22 in the puncture state of the medical needle 100 shown in FIG. 2 is removed from the needle hole 22 in the extracted state shown in FIG. When swinging and moving to the upper part, interference with the step corner 251 of the recess 25 is prevented.

  The needle body 10 used in the present embodiment is a Huber needle in which the needle tip 11 is eccentric. By using the Huber needle, it is minimally invasive to the body wall, and even if the needle body 10 is repeatedly punctured many times with respect to the access port, damage to the port is suppressed. The needle tip 11 may be formed to be eccentric and tapered within the diameter of the needle tube of the needle body 10, or the tip of the needle tip 11 is formed by bending the needle tip 11 from the needle body 10 to one side in the radial direction. May be eccentric from the needle body 10. As shown in FIGS. 2 and 4, the needle tip 11 of the needle body 10 of the present embodiment is bent toward the proximal side (right side in the figure). The lid 60 is driven in conjunction with the transition of the medical needle 100 from the puncture state to the removal state, and swings in the same direction as the eccentric direction of the needle tip 11, that is, the bending direction (proximal side). 11 and the needle hole 22. The eccentric direction of the needle body 10 (Huber needle) is not particularly limited. The eccentric direction of the needle tip 11 may be the distal side (left side in the figure) contrary to the present embodiment.

  As shown in FIG. 4, the proximal end side of the needle body 10 of the present embodiment is bent at an acute angle of more than 90 degrees in a natural state. Specifically, the needle body 10 is bent at a bending angle θ of 75 degrees or more and 85 degrees or less in the vicinity of the tip portion (distal portion) of the needle support portion 40.

  The needle support portion 40 is a hollow cylindrical member that is attached to the proximal end portion of the needle body 10 and allows the needle body 10 and the liquid feeding tube 46 to communicate with each other. The proximal end portion of the needle body 10 is inserted through the needle support portion 40. A liquid feed tube 46 is fitted and fixed to the proximal side of the needle support portion 40, and the proximal end portion of the needle body 10 is inserted through the liquid feed tube 46.

  The needle support portion 40 is connected to the base portion 20 via the connection mechanism 50 and moves toward and away from the base portion 20. In the puncture state shown in FIGS. 1 and 2, the needle support portion 40 is close to the base portion 20. Thereby, the needle body 10 is inserted deeply into the needle hole 22, and the entire needle tip 11 protrudes below the lower end opening 23 of the base portion 20.

  The liquid feeding tube 46 is made of a flexible resin material such as nylon, polyurethane, silicone rubber, or fluororesin. A luer connector (not shown) is attached to the proximal side of the liquid feeding tube 46, and a syringe (not shown) filled with a liquid such as a chemical solution or a nutrient is detachably attached. Thereby, by operating the syringe, the liquid is discharged from the needle tip 11 through the liquid feeding tube 46 and the needle body 10 and supplied to the access port and the medical device.

  The medical needle 100 is in a puncture state (see FIGS. 1 and 2) in an initial state. That is, when the use of the medical needle 100 is started, the needle body 10 is provided through the needle hole 22 in advance. In order to prevent erroneous puncturing of the needle body 10, a cap (not shown) formed in a tube shape or the like may be attached to the needle tip 11 of the needle body 10 in the initial state to protect the needle tip 11. Thereby, the medical needle 100 can be immediately used for the procedure by removing the cap.

  As shown in FIG. 5, the base portion 20 has a needle guide 206 above the needle hole 22. The needle guide 206 is a half-cylindrical recessed portion provided on the distal side of the needle body 10 in the base portion 20, that is, on the opposite side of the eccentric direction (bending direction) of the needle tip 11 of the Huber needle (needle body 10). It is a site | part which guides the needle body 10 pulled up. The needle body 10 that is lifted from the puncture state to the removal state is supported at two points by the needle hole 22 and the needle guide 206 in at least a part of the pulling operation. Thereby, the needle body 10 can be stably pulled straight upward. Since the needle guide 206 is formed on the side opposite to the eccentric direction (bending direction) of the needle tip 11, the needle body 10 is favorably supported by the needle guide 206 when the needle tip 11 to be pulled up passes through the needle hole 22. Is done.

  As shown in FIG. 4, the coupling mechanism 50 is a mechanism that couples the base portion 20 and the needle support portion 40 and regulates the upper limit of the separation distance between the base portion 20 and the needle support portion 40. In the puncture state shown in FIGS. 1 and 2, the coupling mechanism 50 is folded. Then, by pulling up the needle support portion 40 from the base portion 20 in the medical needle 100 in the puncture state, the connection mechanism 50 is deployed, and the medical needle 100 transitions to the removal state. In the extracted state shown in FIGS. 3 and 4, the coupling mechanism 50 is fully deployed.

  In the extracted state, the needle tip 11 of the needle body 10 is retracted at least above the lower end opening 23 of the needle hole 22. In the medical needle 100 of the present embodiment, the needle tip 11 of the needle body 10 is completely removed from the needle hole 22 in the removed state and is positioned above the lid portion 60. However, instead of this embodiment, the needle tip 11 of the needle body 10 in the extracted medical needle 100 may be accommodated inside the needle hole 22 without being extracted from the needle hole 22. In such a case, the lid 60 may close the needle hole 22 at the lower end or the middle part of the needle hole 22 (but below the needle tip 11).

  The connection mechanism 50 includes a plurality of folding pieces 53 and 54 connected to each other so as to be foldable. In the present embodiment, an example in which the coupling mechanism 50 includes two folding pieces 53 and 54 is illustrated, but the number of folding pieces is not limited to this and may be three or more. The folding pieces 53 and 54 are connected in series so that they can be folded together. The folding pieces 53 and 54 can be made by injection molding of a resin material. The coupling mechanism 50 can transition from a folded state in which the folding pieces 53 and 54 are folded to each other to an unfolded state in which the folding pieces 53 and 54 are deployed to each other. In the puncture state (initial state) of the medical needle 100, the coupling mechanism 50 is in a folded state (see FIGS. 1 and 2). Contrary to the above, the coupling mechanism 50 may be configured to be able to transition from the expanded state to the folded state. However, in the medical needle 100 of the present embodiment, the lid 60 closes the needle hole 22 and the needle body 10 is lowered when the connecting mechanism 50 is shifted to the deployed state and the medical needle 100 is removed. Due to the prohibition, the coupling mechanism 50 is restricted from transitioning from the expanded state to the folded state again.

  The connection mechanism 50 (folding pieces 53 and 54) in the folded state is folded closer to the proximal side than the base portion 20 and is held between the needle support portion 40 and the base portion 20. By pulling up the needle support portion 40 from the base portion 20, the medical needle 100 is pulled out, and the linking piece 53 and the foldable piece 54 are aligned with each other, so that the coupling mechanism 50 transitions to the expanded state ( (See FIGS. 3 and 4). The connection mechanism 50 stands up from the base portion 20, and the base portion 20, the connection mechanism 50, and the needle support portion 40 are arranged in a substantially straight line. The lid portion 60 is inserted between the needle tip 11 and the needle hole 22 in conjunction with the lifting of the needle body 10 from the base portion 20 and the transition of the coupling mechanism 50 from the folded state to the deployed state. Thereby, the lowering of the needle body 10 is prohibited, and the developed state of the coupling mechanism 50 is maintained.

  As described above, the medical needle 100 has the hinge portion 57 that connects the connecting mechanism 50 to the base portion 20 so as to be swingable. The lower folding piece 53 closest to the base portion 20 is rotatably connected to the base portion 20 by a hinge portion 57. The rotation axis direction of the hinge portion 57 is the width direction of the coupling mechanism 50, in other words, the depth direction of the paper in FIGS. The lid portion 60 is integrally provided on the opposite side of the coupling mechanism 50 via the hinge portion 57. The lid part 60 swings around the hinge part 57 together with the connecting mechanism 50. The lid portion 60 rotates and swings around the hinge portion 57 in the same direction as the coupling mechanism 50. As a result, when the sideways connecting mechanism 50 rotates in the direction in which it rises, the lid 60 transitions from the sideways state to the suspended state.

  The upper folding piece 54 closest to the needle support portion 40 is rotatably connected to the tip portion (distal portion) of the needle support portion 40 by an upper end hinge 59 (see FIG. 4). The rotation axis direction of the upper end hinge 59 is the width direction of the coupling mechanism 50, similarly to the rotation axis direction of the folding piece 53 with respect to the base portion 20. The foldable piece 53 and the foldable piece 54 are coupled to each other so as to be rotatable with the width direction of the coupling mechanism 50 as the rotation axis direction.

  The medical needle 100 has a holding portion 68 that releasably restricts the folded connection mechanism 50 from being expanded. In the puncture state of the medical needle 100, the holding portion 68 is locked with respect to the engaging protrusion 28 provided on the base portion 20 (see FIG. 2). Thereby, in the punctured medical needle 100, the needle tip 11 of the needle body 10 is prevented from retreating unexpectedly with respect to the base portion 20 and the contact portion 30, and the subject's body wall or various medical devices can be prevented. Thus, the needle body 10 can be punctured stably. More specifically, the holding portion 68 of the present embodiment has a pair of claw shapes protruding from the needle support portion 40 toward the base portion 20 and facing each other inward in the width direction. The engagement protrusions 28 are formed so as to protrude above the base portion 20 and proximally (rightward in FIG. 2). A protruding portion 282 is formed so as to protrude outward in the width direction along the upper edge of the engaging protruding piece 28 (see FIG. 3). The pair of holding portions 68 are attached to the engaging protrusions 28 of the coupling mechanism 50 in the folded state from the outside in the width direction, and the claws of the holding portions 68 are latched to the protrusions 282. Thereby, the connection mechanism 50 is locked to the base part 20 in the folded state.

  As shown in FIG. 2, the needle support portion 40 moves toward the proximal side (rear end side) in a state where the coupling mechanism 50 is in the folded state and the holding portion 68 is latch-engaged with the engaging protrusion 28. Inclined diagonally downward. Thereby, the dimension which the needle support part 40 protrudes upwards rather than the contact part 30 can be suppressed, and clothes and other articles may interfere with the needle support part 40 in the state in which the medical needle 100 was detained. It is suppressed.

<Operation of Lid 60 and Connection Mechanism 50>
With reference to FIGS. 6 to 8, operations of the lid 60 and the coupling mechanism 50 will be described. FIG. 6 is a perspective view showing the lid 60 and the coupling mechanism 50 in the puncture state. FIG. 7 is a perspective view showing the lid 60 and the coupling mechanism 50 in the transition state. FIG. 8 is a perspective view showing the lid 60 and the coupling mechanism 50 in the removed state. 6 to 8, the needle half 10, the coupling mechanism 50, the lid 60, and the base half 21b in the base 20 are illustrated, and the base half 21a and other members are not shown.

  As shown in FIG. 6, in the punctured medical needle 100, the needle body 10 is inserted into the needle hole 22 of the base half 21 b (base portion 20), and the needle tip 11 is below the lower end opening 23 of the needle hole 22. Protruding. The lid 60 is positioned above the needle hole 22 and the recess 25, and is engaged with the lower surface of the ascending restriction portion 202 of the base half 21b. Thereby, the upward movement of the lid 60 is restricted. The lid portion 60 is provided on the opposite side of the coupling mechanism 50 (folding piece 53) via the hinge portion 57. In the puncture state, the folding piece 53 of the coupling mechanism 50 is disposed on its side.

  When the needle support portion 40 is lifted in the penetrating direction of the needle hole 22 with respect to the base portion 20 (base half body 21b) from the initial state (puncture state) shown in FIG. 6, the insertion depth of the needle tip 11 into the needle hole 22 is When the needle support portion 40 is further lifted, the needle tip 11 of the needle body 10 is drawn into the lower end opening 23 (see FIG. 7). Such a state is a transition state of the medical needle 100. In the transition state, the folding piece 53 (the coupling mechanism 50) rotates around the hinge portion 57 and rises obliquely toward the proximal end side.

  The coupling mechanism 50 has an extending portion 51 that extends to the opposite side beyond the hinge portion 57. The lid portion 60 is connected to the extending portion 51 so as to be swingable about an axis parallel to the swing shaft 58 (see FIG. 6) of the hinge portion 57. Specifically, the boundary portion 64 between the lid portion 60 and the extending portion 51 is formed thinner than the lid portion 60 and the extending portion 51. Accordingly, the boundary portion 64 can be easily bent, and the lid portion 60 can swing with respect to the extending portion 51 around the boundary portion 64. Since the extending portion 51 is present on the tip side of the hinge portion 57, the lid portion 60 swings on the opposite side of the folding piece 53 in conjunction with the axial rotation of the folding piece 53 around the hinge portion 57. Move. Specifically, when the folding piece 53 rises with respect to the base portion 20, the lid portion 60 is moved away from the ascending restriction portion 202. At this time, the lid 60 moves not only downward but also to the base end side (the right side in FIGS. 2 and 4). As a result, as shown in FIG. 7, the ridgeline 63 on the lower surface 62 (see FIG. 5) of the lid 60 passes so as to graze the stepped corner 251 of the recess 25, and the lid 60 enters the recess 25. In the transition state, as shown in FIG. 7, the boundary portion 64 is bent and the lid portion 60 is bent in a V shape with respect to the extending portion 51.

  The lid portion 60 is bent from a substantially linear direction to a substantially orthogonal direction with respect to the extending portion 51 by swinging about an axis (boundary portion 64) parallel to the swing shaft 58. Then, the bent lid portion 60 closes the needle hole 22. That is, in the puncture state of the medical needle 100 shown in FIG. 6, the lid portion 60, the extension portion 51, and the folding piece 53 are arranged in a substantially linear shape, and the medical needle 100 shown in FIG. The lid 60 and the extending part 51 are substantially orthogonal. The extending part 51 and the folding piece 53 stand substantially parallel to the needle body 10, and the lid part 60 is disposed on its side so as to be orthogonal to the depth direction (vertical direction) of the needle hole 22. In such a state, the lid 60 closes the needle hole 22.

  The folding piece 53 has at least a part of the lower side connected to the base portion 20 formed in a bifurcated shape, and a pair of hinge portions 57 are provided so as to protrude outward in the width direction. In the medical needle 100 of the present embodiment, a pair of hinge portions 57 and extending portions 51a and 51b are formed on both sides of the needle body 10 and the needle hole 22, respectively. The lid portion 60 is formed across a pair of extending portions 51a and 51b (see FIG. 7). Thereby, the cover part 60 does not substantially displace in the width direction, but swings stably in the vertical direction and the distal end direction. The needle body 10 is inserted into a rectangular opening surrounded by the folding piece 53 and the lid portion 60. When the needle body 10 is pulled up and the needle tip 11 is removed from the needle hole 22, the medical needle 100 reaches the removed state (see FIG. 8). The lid 60 closes the entire needle hole 22 by being inserted between the needle tip 11 and the needle hole 22.

  In the extracted state, the folding piece 53 (the coupling mechanism 50) stands substantially vertically from the base portion 20 and abuts against the forward movement restricting portion 204. The forward restricting portion 204 is formed in a concave groove shape extending in the vertical direction, and is formed in a fitting shape for closely accommodating the folded piece 53. The upright folding piece 53 is held by the forward movement restricting unit 204, and the folding piece 53 is restricted from falling backward again. The lid 60 is inserted between the needle hole 22 and the needle tip 11 in the extracted state. For this reason, it is prohibited that the needle body 10 is reinserted into the needle hole 22, and the needle body 10 functions as a support rod to prevent the coupling mechanism 50 from being folded. Thereby, the medical needle 100 is not restored from the removed state to the puncture state. The medical needle 100 that has transitioned to the extracted state is discarded.

  As shown in FIG. 8, when the medical needle 100 is in the removed state, the lid 60 is bent at a substantially right angle at the boundary portion 64 and is stored in the recess 25 in a state of intersecting the extending portion 51. . Then, the coupling mechanism 50 (folding piece 53) stands up substantially perpendicular to the base portion 20. As a result, the lid 60 closes the needle hole 22. When attempting to lay down the coupling mechanism 50 again in such a state, the extending portion 51 and the lid portion 60 try to swing toward the distal end side (lower left direction in FIG. 8) around the hinge portion 57. However, since the lid 60 collides with the standing wall 252 on the distal side of the recess 25, the lid 60 cannot get over the step corner 251. That is, the swing of the lid 60 is restricted. For this reason, the connecting mechanism 50 once upright and pulled out cannot be laid down again. In other words, the medical needle 100 in the removed state is prohibited from returning to the transition state, and the medical needle 100 is stable. To do.

  FIG. 9 is a side view showing a puncture state of the medical needle 100 according to the second embodiment of the present invention. FIG. 10 is a plan view of the same state, and FIG. 11 is a front view. A pressing piece 84 indicated by a two-dot chain line in FIG. 11 represents a state bent downward from an initial state indicated by a solid line.

  The medical needle 100 according to the present embodiment includes a flat plate-shaped or curved plate-shaped contact portion 30 that is used in contact with the body surface of a subject, and the base portion 20 is locked to the contact portion 30. In common with the first embodiment, the base portion 20 is different from the first embodiment in that it has a holding piece 84 that overlaps the upper surface of the contact portion 30. Hereinafter, the description common to the first embodiment is omitted as appropriate.

  Similar to the first embodiment, the contact portion 30 includes a lock portion (lock member 34) that holds the base portion 20 toward the corresponding contact portion 30. The lock member 34 has a pair of claw portions extending upward, the base portion 20 is held by the claw portions, and movement away from the contact portion 30 is restricted. The holding piece 84 is integrally formed with the base portion 20.

  Specifically, a pair of pressing pieces 84 are formed on the base portion 20 so as to protrude outward in the width direction. The holding piece 84 is a plate-like protruding piece. When the user presses the holding piece 84 with a finger or the like from above, the holding piece 84 is pressed against the contact portion 30 as shown by a two-dot chain line in FIG. Can be pressed against the table. Therefore, when the needle 10 is pulled up and transitioned to the removal state (see FIGS. 3 to 5) in the medical needle 100 in the puncture state (see FIGS. 1, 2 and 9 to 11), the needle body 10 and the needle The base portion 20 is prevented from being detached from the lock member 34 by the frictional force generated between the holes 22. That is, since the base part 20 is urged downward when the user firmly presses the holding piece 84 against the body surface, the upward is applied from the needle body 10 to the base part 20 through the needle hole 22. The frictional force is offset. For this reason, when the needle body 10 is pulled up, the pulling force of the base portion 20 is prevented from acting on the claw portion of the lock member 34 fixed to the contact portion 30.

  The pressing piece 84 and the base portion 20 are connected via an easily bendable portion 86 that is formed to be bendable toward at least one of the vertical directions. The easily bendable portion 86 of the present embodiment is a rod-shaped portion that connects the pair of pressing pieces 84 to the base portion 20 (base halves 21a and 21b). The cross section of the rod-shaped easy-bending portion 86 has a rectangular shape in which the dimension in the vertical (thickness) direction is smaller than the dimension in the front-rear (width) direction. In addition, the dimension in the vertical (thickness) direction of the cross section of the easy-bending portion 86 is smaller than the dimension of the pressing piece 84. For this reason, the easily bendable portion 86 is easily bent in the vertical direction parallel to the advancing / retreating direction of the needle body 10.

  From the viewpoint of pressing the pressing piece 84 against the upper surface of the contact portion 30 when the needle body 10 is pulled up and fixing the contact portion 30 to the body wall, the easily bendable portion 86 may be bent downward. preferable. Here, the easily bendable portion 86 is freely bendable when the user presses the holding piece 84 upward or downward with a finger or the like in a normal procedure. This means that a strain larger than that of the piece 84 is generated and bending deformation occurs.

  Further, when the medical needle 100 according to the present embodiment is punctured into the body wall of the subject, the user bends the dome-shaped contact portion 30 upward and picks it up so that the contact portion 30 is turned upside down. 11 can be sufficiently exposed. It is preferable that the pressing piece 84 can be bent upward together with the abutting portion 30 so as not to hinder the front / back reversing operation. For this reason, it is preferable that the easily bendable portion 86 is also bendable upward.

  As shown in FIG. 10, an uneven portion 88 is formed on at least the upper surface of the pressing piece 84. The form of the concavo-convex portion 88 is not particularly limited, and the upper surface of the pressing piece 84 may be formed by roughening, or a protrusion or a concave portion may be formed on the upper surface of the pressing piece 84. The concavo-convex portion 88 of the present embodiment is a large number of through holes that penetrate the pressing piece 84 in the thickness direction. By forming the concavo-convex portion 88 on the upper surface of the pressing piece 84, it is possible to suppress the user's finger or the like from slipping on the upper surface of the pressing piece 84 and press the pressing piece 84 against the upper surface of the contact portion 30. it can. From the viewpoint of increasing the frictional resistance of the contact surface between the pressing piece 84 and the abutting portion 30 and suppressing the pressing piece 84 from sliding relative to the abutting portion 30, the uneven portion 88 is formed on the lower surface of the pressing piece 84. May be formed.

  The medical needle 100 of this embodiment is different from the first embodiment in that it has a vent hole 70 that penetrates the contact portion 30 in the thickness direction. Since the contact portion 30 has the vent hole 70, sweat generated between the contact portion 30 and the living tissue (body surface) can be vaporized or outflowed through the vent hole 70. .

  In the present embodiment, an example in which a plurality of vent holes 70 are uniformly and concentrically distributed around the periphery of the contact portion 30 so as to surround the base portion 20 is illustrated. However, the number and arrangement of the vent holes 70 are not particularly limited.

  The vent hole 70 of the present embodiment has at least one top portion 72. The top portion 72 is disposed toward the inner side in the radial direction of the contact portion 30. Since the vent hole 70 has the top portion 72, a capillary phenomenon occurs in the vicinity of the top portion 72, and sweat generated between the living tissue (body surface) and the contact portion 30 flows from the vicinity of the top portion 72 to the contact portion 30. It can guide to the upper surface side. As a result, even when the sweat accumulates inside the vent hole 70 and the sweat droplet accumulates outside the dome-shaped contact portion 30 in the radial direction, the sweat can be continuously derived from the body surface through the top portion 72. . Specifically, the shape of the vent hole 70 is a narrow shape in the vicinity of the top portion 72, and is a tapered shape that changes to a wider width toward the radially outer side of the contact portion 30. Specifically, the vent hole 70 may have a heart shape, a fan shape, or a drop shape.

  The pair of pressing pieces 84 protrudes in the horizontal direction from the base portion 20 toward the outside in the width direction. The shape and size of the pressing piece 84 are not particularly limited, but are preferably the shape and size included in the contact portion 30 in a plan view shown in FIG. Accordingly, when the pressing piece 84 is pressed downward with a finger or the like, the contact portion 30 can be pressed against the body surface regardless of which part of the pressing piece 84 is pressed. As shown in FIG. 10, the pressing piece 84 of the present embodiment overlaps with the vent hole 70 in plan view. However, in a state where the easy-bending portion 86 is bent and the pressing piece 84 is pressed against the contact portion 30 (indicated by a two-dot chain line in FIG. 11), it is preferable that the pressing piece 84 does not overlap the vent hole 70. Thereby, since the vent hole 70 is not blocked by the pressing piece 84, it is possible to prevent the effect that sweat is led out from the body surface through the vent hole 70 from being impaired. Therefore, the vent hole 70 may be formed at a location in the circumferential direction of the contact portion 30 that avoids the protruding position of the pressing piece 84. Alternatively, the protruding length of the pressing piece 84 protruding from the base portion 20 may be equal to or shorter than the length along the upper surface of the contact portion 30 from the base portion 20 to the vent hole 70 (top portion 72).

  The present invention is not limited to the above-described embodiment, and includes various modifications and improvements as long as the object of the present invention is achieved.

  For example, although holding of the folding piece 53 standing in the extracted state by the forward movement restricting portion 204 (see FIGS. 6 to 8) of the base portion 20 is exemplified, the present invention is not limited to this. The medical needle 100 may include a lock portion (not shown) that latches the foldable folding piece 53. Moreover, although the three-dimensional curved shape was illustrated as the contact part 30 (refer FIG. 1, FIG. 2), this invention is not limited to this. The contact part 30 may be a flat plate shape.

  It should be noted that the various components of the medical needle 100 of the present invention do not have to be individually independent. A plurality of components are formed as one member, a component is formed of a plurality of members, one component is a part of another component, and one component is And a part of other components are allowed to overlap.

The above embodiment includes the following technical idea.
(1) A base portion having a needle hole, a needle body having a sharp needle tip, the needle tip projecting from the needle hole, and the needle body connected to the base portion so as to be lifted up And a lid that is driven in conjunction with an operation of pulling up the needle body from the base and retracting the needle tip from the needle hole to close the needle hole.
(2) The medical device according to (1), wherein the lid portion is inserted between the needle tip and the needle hole when the needle tip is removed from the needle hole to close the needle hole. Needle.
(3) The medical needle according to (2), wherein the lid portion abuts on an upper end side of the needle hole and closes the needle hole.
(4) The coupling mechanism includes a plurality of folding pieces that are foldably connected to each other, and is capable of transitioning from a folded state in which the folded pieces are folded to each other to an unfolded state in which the folded pieces are unfolded from each other. Yes, the lid is inserted between the needle tip and the needle hole in conjunction with the needle mechanism being pulled up from the base portion and the connecting mechanism shifting from the folded state to the deployed state. The medical needle according to any one of (1) to (3) above.
(5) It has a hinge part which connects the connection mechanism to the base part so as to be swingable, and the lid part is provided integrally on the opposite side of the connection mechanism via the hinge part. The medical needle according to any one of (1) to (4), wherein the medical needle swings together with the connection mechanism.
(6) The coupling mechanism has an extending part that extends to the opposite side beyond the hinge part, and the lid part is parallel to the swinging axis of the hinge part with respect to the extending part The medical needle according to (5), wherein the medical needle is swingably connected around.
(7) When the lid portion swings around the axis, the lid portion bends from a substantially linear direction to a substantially orthogonal direction, and the bent lid portion closes the needle hole. The medical needle as described in 6).
(8) Each of the pair of hinge portions and the extending portion is formed on both sides sandwiching the needle body and the needle hole, and the lid portion is formed across the pair of extending portions, and the needle The medical needle according to (6) or (7), wherein the whole needle hole is closed by being inserted between a tip and the needle hole.
(9) The base portion has a concave portion in which the needle hole is formed in a bottom surface, and the lid portion is fitted into the concave portion in conjunction with an operation of retracting the needle tip from the needle hole. The medical needle according to any one of (1) to (8) above.
(10) The lid portion has an upper surface facing the needle tip and a lower surface facing the needle hole when inserted between the needle tip and the needle hole, and at least a ridge line of the lower surface The medical needle according to (9), wherein a chamfered portion having a larger radius of curvature than that formed on the ridgeline of the upper surface is formed in part.
(11) The medical device according to (9) or (10), wherein a depth dimension of the concave portion is larger than a thickness dimension of the lid portion, and the entire thickness dimension of the lid portion is fitted inside the concave portion. needle.
(12) The needle body is a Huber needle in which the needle tip is bent, and the lid portion swings in the same direction as the bending direction of the needle tip and is inserted between the needle tip and the needle hole. The medical needle according to any one of (1) to (11) above.

Moreover, the said embodiment further includes the following technical thoughts.
(13) It further includes a flat plate-shaped or curved plate-shaped contact portion that is used in contact with the body surface of the subject, and the base portion is locked to the contact portion, The medical needle according to any one of (1) to (12), wherein the medical needle has a pressing piece that overlaps an upper surface.
(14) The medical needle according to (13), wherein the contact portion includes a lock portion that holds the base portion toward the corresponding contact portion, and the pressing piece is integrally formed with the base portion.
(15) The medical use according to (13) or (14), wherein the pressing piece and the base portion are connected via an easily bendable portion that is formed to be bendable toward at least one of the vertical directions. needle.
(16) The medical needle according to any one of (13) to (15), wherein an uneven portion is formed on at least an upper surface of the pressing piece.

DESCRIPTION OF SYMBOLS 10 Needle body 11 Needle tip 20 Base part 202 Ascent restriction part 204 Advance restriction part 206 Needle guides 21a and 21b Base half body 22 Needle hole 23 Lower end opening 24 Upper end opening 25 Recess 251 Step angle part 252 Standing wall 26 Bottom face 27 Bearing hole 28 Engagement Joint protrusion 282 Projection section 29 Bottom plate section 30 Contact section 32 Mounting hole 34 Lock member 36 Cut section 40 Needle support section 46 Liquid supply tube 50 Connection mechanism 51, 51a, 51b Extension section 53, 54 Folding piece 57 Hinge portion 58 Oscillating shaft 59 Upper end hinge 60 Lid portion 61 Upper surface 62 Lower surface 63 Ridge line 64 Border portion 68 Holding portion 70 Vent hole 72 Top portion 84 Pressing piece 86 Easy bending portion 88 Concavity and convexity portion 100 Medical needle θ Bending angle D Depth dimension T thickness dimension

Claims (16)

A base portion having a needle hole;
A needle body having a sharp needle tip provided with the needle tip protruding from the needle hole;
A coupling mechanism that couples the needle body to the base portion so as to be liftable;
A medical needle comprising: a lid portion that is driven in conjunction with an operation of pulling up the needle body from the base portion and retracting the needle tip from the needle hole to close the needle hole.   The medical needle according to claim 1, wherein the lid portion is inserted between the needle tip and the needle hole when the needle tip is removed from the needle hole to close the needle hole.   The medical needle according to claim 2, wherein the lid portion abuts on an upper end side of the needle hole to close the needle hole. The coupling mechanism includes a plurality of folding pieces that are foldably connected to each other, and is capable of transitioning from a folded state in which the folded pieces are folded to each other to an expanded state in which the folded pieces are expanded from each other;
The lid is inserted between the needle tip and the needle hole in conjunction with the needle body being pulled up from the base portion and the connecting mechanism shifting from the folded state to the deployed state. The medical needle according to any one of 1 to 3. A hinge portion for swayably coupling the coupling mechanism to the base portion;
The medical needle according to any one of claims 1 to 4, wherein the lid portion is integrally provided on the opposite side of the coupling mechanism via the hinge portion and swings together with the coupling mechanism. The coupling mechanism has an extending portion that extends to the opposite side beyond the hinge portion;
The medical needle according to claim 5, wherein the lid portion is connected to the extending portion so as to be swingable about an axis parallel to the swing axis of the hinge portion.   The said cover part is bent from the substantially linear direction to the substantially orthogonal direction with respect to the said extension part by rocking | fluctuating around the said axis | shaft, The bent said cover part closes the said needle hole. Medical needles. Each of the pair of hinge portions and the extending portion is formed on both sides sandwiching the needle body and the needle hole,
The medical cover according to claim 6 or 7, wherein the lid portion is formed over a pair of the extending portions, and is inserted between the needle tip and the needle hole to close the entire needle hole. needle. The base portion has a recess in which the needle hole is formed in the bottom surface,
The medical needle according to any one of claims 1 to 8, wherein the lid portion is fitted into the concave portion in conjunction with an operation of retracting the needle tip from the needle hole. The lid portion has an upper surface facing the needle tip and a lower surface facing the needle hole when inserted between the needle tip and the needle hole,
The medical needle according to claim 9, wherein a chamfered portion having a larger radius of curvature than that formed on the ridgeline of the upper surface is formed on at least a part of the ridgeline of the lower surface.   The depth of the said recessed part is larger than the thickness dimension of the said cover part, The medical needle of Claim 9 or 10 with which the whole thickness dimension of the said cover part fits in the inside of the said recessed part. The needle body is a Huber needle in which the needle tip is eccentric,
The medical needle according to any one of claims 1 to 11, wherein the lid portion swings in the same direction as an eccentric direction of the needle tip and is inserted between the needle tip and the needle hole. It further comprises a flat plate-shaped or curved plate-shaped contact portion that is used by contacting the body surface of the subject,
The medical needle according to any one of claims 1 to 12, wherein the base portion includes a pressing piece that is locked to the contact portion and overlaps an upper surface of the contact portion.   The medical needle according to claim 13, wherein the contact portion includes a lock portion that holds the base portion toward the corresponding contact portion, and the pressing piece is integrally formed with the base portion.   The medical needle according to claim 13 or 14, wherein the pressing piece and the base portion are connected via an easy-bending portion that is formed so as to be bent in at least one of the vertical directions.   The medical needle according to any one of claims 13 to 15, wherein an uneven portion is formed on at least an upper surface of the pressing piece.

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