JP2016073450A - Medical needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical needle capable of preventing a needle tip from projecting again unexpectedly, for performing processing such as discard safely, after use.SOLUTION: A needle support part 40 holds a needle body 10, and moves the needle body 10 toward a drawing direction with respect to a needle hole 22, by separating from a base part 20. An expansion structure 52 transitions to a folded state and an expanded state, in which plural folding pieces 53, 54 are connected in a manner of capable of being folded, and both ends of the expansion structure are connected to the needle support part 40 and the base part 20 respectively. A folding regulation part 90 engages with the expansion structure 52 in the expanded state for regulating a folding operation. When the needle support part 40 is pulled up from the base part 20, the expansion structure 52 transitions to the expanded state from the folded state, and the needle tip 11 enters the needle hole 22. Because the folding regulation part 90 regulates the folding operation of the expansion structure 52 in the expanded state, the needle tip 11 entered the needle hole 22 is prevented from projecting from the needle hole 22.SELECTED DRAWING: Figure 4

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 that can accommodate and lock the needle tip of a used needle body by a double cylindrical bearing. This bearing includes an inner bearing that accommodates the needle tip in a vertically movable manner, and an outer bearing that is provided on the outer periphery of the inner bearing. The inner bearing is provided with a wedge-shaped portion. One end of the hinge coupling portion is connected to a hub (needle support portion), and the other end is connected to an inner bearing. When the hub (needle support) is lifted from the contact surface (base) after the procedure, the hinge joint lifts the inner bearing and the cam formed on the inner peripheral surface of the outer bearing elastically presses the inner bearing inward. To do. For this reason, the inner bearing is in close contact with the needle tip surrounding the needle tip. When the hub is further pulled up, the wedge-shaped portion of the inner bearing is latched to the needle tip, the needle body is locked, and its downward movement is restricted. This prevents the needle tip from re-projecting downward from the inner bearing.

Special table 2007-511285 gazette

  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. .

  On the other hand, in the medical needle of Patent Document 1, if the length of pulling up the hub (needle support portion) from the contact surface (base portion) is insufficient and the wedge-shaped portion latch is incomplete, the elastic restoring force of the cam As a result, the inner bearing moves down together with the needle body, and the needle tip may re-project below the inner bearing. When the hub is pulled up, the inner bearing is elastically and strongly pressed by the cam and the friction force increases, making it difficult to perform the lifting operation. However, there is a risk of misrecognizing that the hub has been sufficiently lifted. If the medical needle is left in an incomplete latch state, the inner bearing is pushed down by the elastic restoring force of the cam, so the hub and needle body naturally descends, and the needle tip re-projects below the inner bearing. There is.

  The above-described problem of the medical needle of Patent Document 1 is due to the following reason resulting from safe protection of the needle tip by further applying an elastic force to the needle tip after raising the needle tip from the base portion. Occur. The first reason is that the force required for lifting gradually increases by further applying an elastic force to the cam from the state where the needle tip is pulled up. It is easy for the user to misrecognize that it was broken. The second reason is that the restoring force of the elastically deformed cam acts on the needle body in the direction opposite to the pulling direction of the needle support portion (that is, the downward direction). That is, in the medical needle of Patent Document 1, even if the needle tip is pulled up from the needle hole, the needle tip is likely to be insufficient before the needle tip is safely protected. There is a problem that it is easy to project again unexpectedly.

  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 and provided through the needle hole, and holding the needle body and separating from the base portion. The needle support unit that moves the needle body in the pulling direction with respect to the needle hole and a plurality of folding pieces are connected to each other so as to be foldable, and transition between a folded state and an unfolded state. A deployment structure connected to the support unit and the base unit, and a folding regulation unit that locks the deployment structure in the deployed state and regulates a folding operation of the deployment structure, the needle support unit By pulling up from the base portion, the unfolded structure transitions from the folded state to the unfolded state, the needle tip is immersed in the needle hole, and the folding restricting portion is in the unfolded state of the unfolded state. Immersive by restricting the folding action It is provided a medical needle is restricted to Kihari destination protrudes from the needle holes.

  According to the above invention, by pulling up the needle support portion from the base portion, the needle tip is immersed in the needle hole to protect the needle tip, and the deployed structure transitions from the folded state to the deployed state. Then, the folding operation of the unfolded structure is regulated by the folding regulation unit. Thereby, it is controlled that the needle tip immersed in the needle hole protrudes again from the needle hole. At this time, unlike the method of applying an elastic force to the cam and frictionally restricting the advance (downward) movement of the needle body as in Patent Document 1, in the above invention, the needle body advancement (folding operation of the unfolded structure) is performed. The movement in a direction different from the downward movement is restricted by the folding restricting portion. For this reason, even if the folding restricting portion is canceled unexpectedly, the needle body does not advance (lower) immediately and does not re-project from the needle hole unless the unfolded structure is folded.

  According to the medical needle of the present invention, the needle tip is prevented from re-projecting unexpectedly. Thereby, the medical needle of the present invention can be safely disposed of after use.

It is a side view which shows the puncture state of the medical needle concerning 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 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 a perspective view which shows the medical needle of the extraction state. It is the VI-VI sectional view taken on the line of FIG.

  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 a medical needle 100 according to an embodiment of the present invention. The puncture state of the medical needle 100 is a state in which the needle body 10 is punctured by a subject and the medical needle 100 is indwelled, and is a use state in which the medical needle 100 is used for a procedure. 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 of the present embodiment. The extracted state of the medical needle 100 is a state where the needle body 10 is extracted from the needle hole 22. More specifically, the extracted state is a state in which the needle tip 11 of the needle body 10 has moved (retracted) above the lower end opening 23 of the needle hole 22 (see FIG. 4 for the needle hole 22 and the lower end opening 23). ). In this specification, when the needle body 10 is inserted deeply into the needle hole 22 and the needle tip 11 protrudes greatly from the needle hole 22 is referred to as advancement of the needle body 10 or the needle tip 11. Conversely, when the length that the needle tip 11 protrudes from the needle hole 22 is reduced or the needle tip 11 is immersed in the needle hole 22 is referred to as the needle body 10 or the needle tip 11 retreating. The removed medical needle 100 is discarded in the form shown in FIG. 3 or in a state where the medical needle 100 is further deformed from the form or a combination of other members (not shown). .
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. FIG. 5 is a perspective view showing the medical needle 100 in an extracted state. 1 to 5, the proximal side of the liquid feeding tube 46 connected to the needle support portion 40 is not shown. 6 is a cross-sectional view taken along line VI-VI in FIG.

In this specification, the puncture direction of the needle body 10 may be referred to as the lower side, and the removal direction of the needle body 10 may be referred to as the upper direction. However, this is provided for convenience in describing the relative relationship of the components. Yes, the direction of the product according to the present invention during manufacture or use is not necessarily limited.
Further, in the medical needle 100, the side on which the liquid feeding tube 46 extends is referred to as the proximal side or the rear side, and the side on which the needle body 10 is attached to the liquid feeding tube 46 is the distal side or the front side. May be called.

First, the outline | summary of the medical needle 100 of this embodiment is demonstrated. The medical needle 100 includes a needle body 10, a base portion 20, a needle support portion 40, a deployment structure 52, and a folding restriction portion 90. The base portion 20 has a needle hole 22. The needle body 10 has a sharp needle tip 11 and is provided through the needle hole 22. The needle support portion 40 holds the needle body 10 and moves the needle body 10 in the pulling direction with respect to the needle hole 22 by being separated from the base portion 20. In the unfolding structure 52, a plurality of folding pieces 53 and 54 are connected to each other so as to be foldable, and transition between a folded state (see FIGS. 1 and 2) and a unfolded state (see FIGS. 3 to 6). Are connected to the needle support part 40 and the base part 20, respectively. The folding restricting portion 90 is a structure that engages with the unfolded unfolded structure 52 (folded piece 53 in the present embodiment) and restricts the folding operation of the unfolded structure 52.
By pulling up the needle support portion 40 from the base portion 20, the deployment structure 52 transitions from the folded state to the deployed state, and the needle tip 11 is immersed in the needle hole 22. In the medical needle 100 of the present embodiment, the needle tip 11 that is immersed in the needle hole 22 may protrude from the needle hole 22 when the folding restricting portion 90 restricts the folding operation of the deployed structure 52 in the deployed state. Be regulated.

  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 contact portion 30 that contacts the body surface (skin surface) of the subject. The contact portion 30 of this embodiment is curved three-dimensionally in a dome shape. The contact part 30 has a partial spherical shape and opens downward from FIG. 1 to FIG. 4. The needle body 10 penetrates the contact portion 30 toward the center of the partial spherical surface. As a result, the needle body 10 can be punctured into the body surface in a state where the contact portion 30 is in close contact with the body surface that has been slightly expanded due to the embedded access port. The contact part 30 has flexibility and can be deformed following the raised shape of the body surface. 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, 4, and 5, 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 pick the dome-shaped contact portion 30 and invert the front and back. Accordingly, when the needle body 10 of the medical needle 100 is punctured into the body surface or medical device of the subject, the contact portion 30 can be used as a knob, and the needle tip 11 of the needle body 10 is used as the contact portion. It is exposed from 30 and visibility becomes good.

  A base portion 20 is provided on the top of the dome-shaped contact portion 30. More specifically, an attachment hole 32 is formed in the top of the contact portion 30, and a lock member 34 is fitted in the attachment hole 32. A pair of claw portions 35 are formed on the upper surface side of the lock member 34, and the base portion 20 is mounted on the upper surface side of the lock member 34 and is locked by the claw portions 35. Thereby, the base part 20 is integrated with the lock member 34 and the contact part 30 (see FIG. 2 for the attachment hole 32, the claw part 35, and the contact part 30).

  The base part 20 is composed of one or a plurality of parts made of a material harder than the contact part 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 may be formed inside the base portion 20, or may be formed between the base member 20 and another member such as the lock member 34 or the contact portion 30. The base portion 20 of the present embodiment is composed of a first part 24 and a second part 26. The needle hole 22 is formed in a joint where the first part 24 and the second part 26 are combined in the front-rear direction. The first component 24 includes a design-designed head base 27 (see FIG. 5) and a folding restricting portion 90 that projects from the head base 27 to the proximal side. The second part 26 includes a needle tip receiving groove 80, to which the development structure 52 is connected (see FIGS. 2, 4 and 6). The needle tip receiving groove 80 will be described later.

  As shown in FIGS. 2 and 6, a semi-oval through hole is formed as a needle hole 22 at the distal end edge of the second part 26, and the lower end opening 23 of the needle hole 22 is a semi-oval. Make. On the other hand, a semi-oval bottomed concave portion 25 that forms the upper end opening 21 of the needle hole 22 is formed at the proximal end edge of the first component 24. By combining the first component 24 and the second component 26 with each other in the front-rear direction, the needle hole 22 that penetrates the base portion 20 and has a large opening at the upper end side is formed. That is, the needle hole 22 of the present embodiment includes a through hole having a lower end opening 23 having a small opening diameter (maximum diameter) and an upper end opening 21 having a large diameter communicating in the vertical direction and having the lower end opening 23 as a lower end. The bottomed recess 25 is included.

  The needle body 10 is inserted through the needle hole 22 in the puncture state. By pulling up the needle support portion 40 from the base portion 20, the needle body 10 is lifted together with the needle support portion 40, and the needle tip 11 is retracted at least from the lower end opening 23 of the needle hole 22 and enters the needle hole 22 (see FIG. 4).

  The needle body 10 of the present embodiment is a Huber needle in which the needle tip 11 is bent. By using a Huber needle, it is minimally invasive to the body surface, and even if the needle body 10 is repeatedly punctured many times with respect to the access port, damage to the port is suppressed. As shown in FIGS. 1 and 2, the needle tip 11 of the needle body 10 is bent from the needle hole 22 toward the needle tip receiving groove 80, that is, to the right (proximal side) in the drawing. However, contrary to the present embodiment, the bending direction of the needle tip 11 may be the direction from the needle tip receiving groove 80 toward the needle hole 22 (left side: distal side in the figure).

  The needle tip 11 of this embodiment is bent toward the proximal side. As shown in FIG. 4, the needle body 10 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. When pulling up the needle support portion 40 from the puncture state (FIG. 2) to the removal state (FIG. 4), the needle support portion 40 is arranged so that the needle body 10 substantially coincides with the depth direction (vertical direction) of the needle hole 22. It is good to adjust the angle. Thereby, interference with the peripheral surface of the needle hole 22 of the needle body 10 is reduced.

  The upper end opening 21 corresponding to the proximal end side of the needle body 10 in the needle hole 22 is opposite to the bending direction of the needle tip 11 relative to the lower end opening 23 corresponding to the needle tip side (that is, the distal side: the left in FIGS. 1 to 4) Diameter) That is, the bottomed recess 25 having the upper end opening 21 as the upper end is formed on the distal side of the lower end opening 23. Note that the upper end opening 21 may be expanded not only in the direction opposite to the bending direction of the needle tip 11 but also in the bending direction (proximal side).

  In the medical needle 100 of the present embodiment, as shown in FIG. 4, when the needle support portion 40 is pulled up from the base portion 20, when the bent needle tip 11 is immersed in the lower end opening 23, the bottomed recess 25 is This is the retracted position of the needle body 10. That is, when the needle tip 11 passes through the lower end opening 23, the needle body 10 (upper portion close to the needle tip 11) passes more distally than the lower end opening 23. For this reason, by forming the bottomed recess 25 on the distal side of the lower end opening 23, the upper portion of the needle body 10 can pass through the bottomed recess 25 when the needle body 10 is removed. Therefore, when the needle support part 40 is pulled up, the friction between the needle body 10 and the base part 20 does not become excessive, and the needle support part 40 can be pulled up easily and reliably.

  The needle support portion 40 is directly or indirectly connected to the base portion 20 and moves toward and away from the base portion 20. The needle support portion 40 holds the proximal end portion of the needle body 10. The needle body 10 of the present embodiment has a distal end portion on which the needle tip 11 is formed and a proximal end portion that is bent at a substantially right angle with respect to the distal end portion and held by the needle support portion 40. The needle support portion 40 has a cylindrical shape, and the proximal end portion of the needle body 10 is inserted through the needle support portion 40. A liquid supply tube 46 is 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 supply tube 46. In the puncture state shown in FIGS. 1 and 2, the needle support portion 40 is close to the base portion 20. As a result, the needle body 10 is inserted deeply into the needle hole 22, and the substantially entire length of the distal end portion of the needle body 10 projects downward from 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 needle support portion 40 can be pulled up with respect to the base portion 20 in the penetrating direction of the needle hole 22. When the needle support portion 40 is lifted away from the base portion 20 and separated, the insertion depth of the needle tip 11 with respect to the needle hole 22 decreases, and when the needle support portion 40 is further lifted, the needle tip 11 of the needle body 10 opens the lower end. Immerse in 23.

  The deployment structure 52 is a mechanism that connects the base portion 20 and the needle support portion 40 and restricts 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 unfolding structure 52 is folded and is in a tension-free state in which no tension is applied to both ends. The unfolding structure 52 is unfolded by pulling up and separating the needle support portion 40 from the base portion 20. In the extracted state shown in FIGS. 3 and 4, the unfolding structure 52 is completely unfolded. In this extracted state, tension may be applied to both ends of the deployment structure 52.

  The needle tip 11 of the needle body 10 is retracted upward from the lower end opening 23 of the needle hole 22 in the extracted state in which the needle support portion 40 is pulled up to the maximum. At this time, the needle tip 11 may be accommodated in the needle hole 22 or may be pulled up above the needle hole 22. In the present embodiment, the needle tip 11 is accommodated inside the needle hole 22 as shown in FIG.

  The medical needle 100 is in a puncture state at the start of use. 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 this embodiment, the medical needle 100 is in a puncture state at the start of use, and the needle tip 11 of the needle body 10 protrudes below the lower end opening 23 of the needle hole 22. At this time, in order to prevent erroneous puncture of the needle body 10, it is preferable to protect the needle tip 11 by attaching a tube-like cap (not shown) to the needle tip 11 of the needle body 10. Thereby, the medical needle 100 can be immediately used for the procedure by removing the cap.

  The unfolding structure 52 includes a plurality of folding pieces. In this embodiment, although the expansion | deployment structure 52 illustrates the aspect provided with the two folding pieces 53 and 54, the number of folding pieces is not restricted to this, Three or more may be sufficient. The development structure 52 of this embodiment can be created by injection molding of a resin material.

  The plurality of folding pieces 53 and 54 are connected in series so that they can be folded together. The folding restricting portion 90 restricts the rotation of the folding piece 53 by locking the folding piece 53 and the base portion 20 that are arranged closest to the base portion 20 and are rotatably connected to each other.

  More specifically, as shown in FIG. 5, the lower folding piece 53 closest to the base portion 20 is rotated with respect to the base portion 20 (specifically, the second component 26) by the lower end hinge 57. It is linked movably. The rotational axis direction of the lower end hinge 57 is the width direction of the deployment structure 52, in other words, the depth direction of the paper in FIGS. Similarly, the upper folding piece 54 closest to the needle support portion 40 is rotatably connected to the distal end portion (distal portion) of the needle support portion 40 by an upper end hinge 58. The rotation axis direction of the upper end hinge 58 is the width direction of the unfolding structure 52, similarly to the rotation axis direction of the folding piece 53 with respect to the base portion 20. Further, the folding piece 53 and the folding piece 54 are connected to each other so as to be rotatable with the width direction of the unfolding structure 52 as the rotation axis direction.

  As shown in FIGS. 1 and 2, the deployment structure 52 is in a folded state in a puncture state in which the needle body 10 is inserted deeply into the needle hole 22 and the needle tip 11 protrudes from the opening of the contact portion 30. By restricting the deployment operation of the deployment structure 52 in such a state, the needle body 10 is prevented from moving backward with respect to the needle hole 22, and the needle body 10 is prevented from unexpectedly falling out of the body surface or medical device. .

  For this reason, the holding part 60 is provided in the medical needle 100 of this embodiment. The holding part 60 is a part that releasably holds the state in which the deployment structure 52 is in the folded state and the needle tip 11 protrudes downward from the needle hole 22. Specifically, as shown in FIGS. 1 and 2, the holding portion 60 has a claw shape that protrudes from the needle support portion 40 toward the base portion 20, and latches and engages with the unfolded deployment structure 52. Thereby, the holding | maintenance part 60 is regulating that the folding piece 53 and the folding piece 54 expand | deploy relatively. Therefore, even when the needle tip 11 of the needle body 10 is pulled upward (pushed up) in the punctured medical needle 100, the deployment structure 52 is restricted from being deployed unless the holding portion 60 is detached from the deployment structure 52. Thus, the needle body 10 is prevented from moving backward with respect to the needle hole 22.

  Further, in the folded state of the deployment structure 52 in which the holding portion 60 is latch-engaged with the deployment structure 52, the needle support portion 40 is inclined obliquely downward toward the proximal side (rear end side). 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. In addition, by causing the rear end side of the needle support portion 40 to be close to the upper surface of the contact portion 30, the needle support portion 40 is prevented from wobbling in the punctured medical needle 100.

  The holding part 60 of this embodiment latches the needle | hook support part 40 and the base part 20 so that release | release is possible. More specifically, the holding section 60 releasably locks the needle support section 40 and the base section 20 via the deployment structure 52 in the punctured medical needle 100. This prevents the needle support portion 40 from being accidentally pulled up from the base portion 20 in the punctured medical needle 100.

  The unfolding structure 52 is configured to be able to make a unidirectional transition from the folded state (FIGS. 1 and 2) to the unfolded state (FIGS. 3 and 4). In the folded state shown in FIGS. 1 and 2, the unfolding structure 52 (folding pieces 53 and 54) is folded proximally with respect to the base portion 20 and held between the needle support portion 40 and the base portion 20. Has been. From this folded state, by pulling up the needle support portion 40 from the base portion 20, the deployment structure 52 becomes the deployment state, and the medical needle 100 transitions to the removal state (FIGS. 3 and 4). Then, when the folding piece 53 is locked to the folding restricting portion 90 in the removed medical needle 100, the deployment structure 52 is restricted from returning to the folded state again.

  The adjacent folding pieces 53 and 54 connected to each other are allowed to be folded in one direction and are restricted from being folded in the other direction. Then, in the state where the needle support portion 40 is pulled up from the base portion 20 and the unfolded structure 52 is in the unfolded state and the foldable piece 53 is locked to the fold regulating portion 90, the unfolded folded pieces 53 and 54 are The folding operation in one direction is restricted.

  When the needle support portion 40 is pulled up to the maximum from the base portion 20, the folding piece 53 and the folding piece 54 are aligned with each other as shown in FIGS. 3 and 4, and the unfolding structure 52 is extended to the maximum. It will be in the expanded state. In this state, the deployment structure 52 stands up from the base portion 20, and the base portion 20, the deployment structure 52, and the needle support portion 40 are arranged in a substantially straight line. In this state, the unfolded structure 52 is locked to the folding restricting portion 90 and the unfolded state is maintained.

  Hereinafter, the fold regulation part 90 of this embodiment is demonstrated.

  The folding restricting portion 90 is a structure that restricts the folding operation of the unfolding structure 52 by engaging with the unfolding structure 52 in the unfolded state. As a result, the needle tip 11 immersed in the needle hole 22 is restricted from projecting downward again from the needle hole 22. The folding restricting portion 90 of this embodiment is locked with the folding piece 53 of the unfolding structure 52 and restrains the rotation of the folding piece 53 around the lower end hinge 57.

  The part in which the folding control part 90 is provided is not specifically limited. In the present embodiment, the folding restricting portion 90 is formed on the first component 24 of the base portion 20. Thereby, the fold regulation part 90 latches the base part 20 and the unfolding structure 52 (folding piece 53) to each other and regulates the movement of the needle body 10 and the needle support part 40. Specifically, when the folding restricting portion 90 is locked to the folding piece 53, the transition of the unfolded structure 52 is restrained in a state where the needle support portion 40 and the base portion 20 are separated as much as possible (extracted state). To do. Thereby, it is controlled that the needle support part 40 moves close to the base part 20 from the extracted state of the medical needle 100, and the extracted state of the medical needle 100 is maintained. For this reason, the used medical needle 100 can be safely discarded.

  The folding restricting portion 90 of this embodiment restricts the movement of the needle body 10 and the needle support portion 40 by locking the base portion 20 and the folding piece 53 to each other. As a result, the folded piece 53 is maintained upright with respect to the base portion 20 in the deployed state of the deployed structure 52. The movement of the unfolding structure 52 that attempts to return from the unfolded state to the folded state is also restricted by the needle body 10. That is, in the folding operation in which the folding piece 54 tends to fall distally (leftward) from the deployed state of the deployed structure 52 shown in FIG. 4, the needle body 10 contacts the first part 24 of the base portion 20. Regulated by Further, the folding operation in which the folding piece 53 tends to fall to the proximal side (right side) is regulated by the locking piece 92 of the folding regulation unit 90. For this reason, when the folding piece 53 is locked by the folding restricting portion 90, the unfolding structure 52 is restricted from being changed from the unfolded state (see FIG. 4) to the folded state (see FIG. 2).

  The folding operation of the deployed structure 52 in the deployed state is an operation in which the folding piece 53 and the folding piece 54 try to fall down proximally or distally, and this is a vertical movement in which the needle body 10 protrudes. It is the operation in the orthogonal direction. Therefore, even if the folding restricting portion 90 is unexpectedly released from the deployed structure 52 in the deployed state, the needle body 10 does not immediately advance (lower) unless the deployed structure 52 is folded, and the needle tip 11 is It does not re-project from the hole 22. For this reason, the medical needle 100 of the present embodiment is safe because the needle tip 11 is prevented from protruding unexpectedly.

  As shown in FIG. 6, the folding restricting portion 90 of this embodiment includes a locking piece 92 that can be elastically deformed. 4 and 5, the folding piece 53 includes an insertion hole 56 into which the locking piece 92 can be inserted. The locking piece 92 is inserted into the insertion hole 56 while being elastically deformed. Then, the locking piece 92 that has been elastically restored is locked to the folding piece 53. Thereby, the base part 20 and the expansion | deployment structure 52 are latched reliably, and it is prevented that the folding control part 90 remove | deviates accidentally from the expansion | deployment structure 52 (folding piece 53).

  The locking piece 92 of the folding restricting portion 90 is integrally formed with the first component 24 of the base portion 20 as a single material. The locking piece 92 is formed at the upper end height of the first part 24 and protrudes toward the proximal side. Thereby, the locking piece 92 is locked at a position as high as possible with respect to the unfolding structure 52 (folding piece 53), and the length from the lower end hinge 57 of the folding piece 53 to the locking piece 92 is ensured to be large. Can do. For this reason, the moment load which the expansion | deployment structure 52 inclines can be canceled suitably by the locking piece 92, and the expansion | deployment structure 52 can be hold | maintained stably.

  The locking piece 92 has a return portion 93. The return portion 93 protrudes from the locking piece 92 toward the outside in the width direction. The locking piece 92 is inclined obliquely outward from the protruding end (right end in FIG. 6) toward the return portion 93. Accordingly, when the locking piece 92 is inserted into the insertion hole 56 of the folding piece 53, the locking piece 92 is elastically pushed away inward and the return portion 93 is fitted into the insertion hole 56. Thereby, the return part 93 is engaged with the folding piece 53.

  The medical needle 100 according to the present embodiment is in a puncture state in a use start state, and is discarded after the needle support portion 40 is pulled up and removed after being used for a procedure. Therefore, once the folding restricting portion 90 has locked the unfolded structure 52, it is not necessary to release the locking of the folding restricting portion 90 again. For this reason, a return portion 93 is provided on the locking piece 92 to restrict the locking piece 92 from being removed from the insertion hole 56.

  The needle tip 11 of the needle body 10 is bent toward the insertion direction of the locking piece 92 or the insertion reverse direction. In the present embodiment, the needle tip 11 is bent toward the insertion direction of the locking piece 92. Since the bending direction of the needle tip 11 is along the insertion direction (or reverse insertion direction) of the locking piece 92, the needle tip 11 and the base portion 20 are moved during the operation of fitting the locking piece 92 into the insertion hole 56. Interference is reduced.

  The folding restricting portion 90 includes a pair of locking pieces 92 that face each other, and a slit portion 94 that is formed between the locking pieces 92. Each of the pair of locking pieces 92 is formed with a return portion 93 outwardly. The pair of locking pieces 92 are combined with each other to form an arrowhead shape. The slit portion 94 is arranged in parallel to the bending direction of the needle tip 11 (right side in FIG. 6). As a result, as shown in FIG. 6, the needle body 10 in the removed state is housed together in the needle hole 22, the bottomed recess 25 and the slit portion 94, and the locking pieces 92 are positioned on both sides of the needle body 10. As described above, since the locking pieces 92 are provided on both sides of the needle body 10, even when an unexpected lateral force is applied in the width direction when the needle support portion 40 is pulled up, a pair of arrowhead-like engagements are provided. The stop piece 92 is guided by the needle body 10 and is securely inserted and fitted into the insertion hole 56 of the folding piece 53.

  As shown in FIG. 6, a protruding piece 95 is formed on the locking piece 92 on the root side of the return portion 93, that is, on the distal side of the medical needle 100 (left side in the figure). The protruding piece 95 restricts the folding piece 53 locked to the return portion 93 from moving to the distal side. As described above, the rotation of the folding piece 53 is restricted by the return portion 93 and the protruding piece 95 of the folding restriction portion 90 (see FIG. 6). Therefore, the needle support portion 40 is prevented from moving forward or backward relative to the base portion 20 in the extracted medical needle 100, and the extracted state of the medical needle 100 is maintained even if the development structure 52 is damaged. Therefore, it can be safely discarded.

  Next, the needle tip receiving groove 80 that protects the needle tip 11 in the removed medical needle 100 will be described.

  The needle tip receiving groove 80 is a space region in which the needle tip 11 which is continuously higher than the upper end opening 21 of the needle hole 22 and further higher than the upper end opening 21 can move. The needle tip receiving groove 80 is formed to extend in the bending direction (proximal side) of the needle tip 11.

  According to the medical needle 100 of the present embodiment, even if the needle tip 11 of the needle body 10 is completely removed above the needle hole 22 in the extracted state in which the needle support portion 40 is pulled up to the maximum, such needle tip is used. 11 can be protected by the needle tip receiving groove 80. In the medical needle 100 of the present embodiment, the needle tip 11 of the needle body 10 is set to be positioned lower than the upper end opening 21 of the needle hole 22 with the needle support portion 40 pulled up to the maximum. However, when the lifting load of the needle support part 40 exceeds a predetermined value or when the forward or backward tilt angle (elevation angle) of the needle support part 40 exceeds a predetermined value, the needle tip 11 of the needle body 10 is used. May reach a position higher than the upper end opening 21 of the needle hole 22. Even in such a case, since the medical needle 100 of the present embodiment includes the needle tip receiving groove 80 surrounded by the peripheral wall 82 reaching higher than the upper end opening 21, the needle tip 11 can be safely protected.

  The needle tip receiving groove 80 is formed so as to cover at least a part of the periphery of the needle tip 11 or the distal end side of the needle tip 11 so that the needle tip 11 cannot be easily accessed from the outside of the medical needle 100. Specifically, a peripheral wall 82 (see FIG. 5) is provided around the needle tip receiving groove 80 of the present embodiment. Thus, at least a part of the periphery of the needle tip 11 is surrounded so that the user's finger or the like cannot easily come into contact with the needle tip 11 located in the needle tip receiving groove 80. Then, as shown in FIG. 4, the needle support portion 40 is lifted from the base portion 20 until the deployment structure 52 is in the deployed state and the separation distance between the base portion 20 and the needle support portion 40 is restricted. The tip 11 is positioned lower than the peripheral wall 82. Thereby, even if the needle support part 40 is pulled up to the maximum, the needle tip 11 does not get over the peripheral wall 82, in other words, the needle tip 11 is not detached from the needle tip receiving groove 80.

  The needle tip receiving groove 80 is exemplified by a concave groove formed by the peripheral wall 82 and the bottom 83, but is not limited thereto. The needle tip receiving groove 80 may be a through slit constituted only by the peripheral wall 82. The bottom 83 of the needle tip receiving groove 80 may be provided above the upper end opening 21 of the needle hole 22, or may be provided at the same height as the upper end opening 21 or below the upper end opening 21. . The bottom portion 83 of the present embodiment is a flat surface provided at the same height as the upper end opening 21 of the needle hole 22, and a peripheral wall 82 is provided around the flat surface. Accordingly, the needle tip receiving groove 80 of the present embodiment forms a guide groove formed in a groove shape in which a flat bottom portion 83 is formed inside the peripheral wall 82. When the folding piece 53 is slightly swung between the return portion 93 and the protruding piece 95 in the removed medical needle 100, the needle tip 11 of the needle body 10 is movable inside the needle tip receiving groove 80. It is. For this reason, stress is prevented from being applied to the needle tip 11 of the needle body 10 in the extracted state.

  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, in the above embodiment, as shown in FIG. 4, the bending angle θ of the needle body 10 is less than 90 degrees, and the tip of the needle body 10 is bent toward the proximal side of the medical needle 100. However, the present invention is not limited to this. The bending angle θ of the needle body 10 may be approximately 90 degrees, and the distal end portion (except the vicinity of the needle tip 11) of the needle body 10 in the removed state may be parallel to the depth direction of the needle hole 22. Thereby, when inserting the needle body 10 into the needle hole 22, a frictional force is not substantially generated, and the needle body 10 can be inserted into the needle hole 22 with a small force.

  It should be noted that the various components of the present invention need not 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 and inserted through the needle hole, and holding the needle body and separating the needle from the base portion A needle support that moves the body in the pulling direction with respect to the needle hole, and a plurality of folding pieces are connected to each other so as to be foldable to transition between a folded state and an unfolded state, An unfolded structure connected to the base portion; and a folding restricting portion that locks the unfolded structure in the unfolded state and restricts the folding operation of the unfolded structure; and the needle support portion is the base portion. The unfolding structure transitions from the folded state to the unfolded state, the needle tip is immersed in the needle hole, and the folding restricting portion is in the unfolding state of the unfolded structure in the unfolded state. By restricting the Medical needle which it is restricted projecting from Kihariana.
(2) The medical needle according to (1), wherein the folding restricting portion locks the base portion and the folding piece to restrict movement of the needle body and the needle support portion.
(3) The plurality of folding pieces are connected in series so as to be foldable with each other, and the folding restricting portion is disposed closest to the base portion and is rotatably connected. The medical needle according to (2), wherein the base part and the base part are locked to each other to restrict the rotation of the folding piece.
(4) The adjacent folding pieces connected to each other are allowed to be folded in one direction and are restricted from folding in the other direction, and the needle support portion is lifted from the base portion to (2) or (2) above, wherein the folded piece in the unfolded state is restricted from folding in the one direction when the unfolded structure is in the unfolded state and the folded piece is locked to the folding restricting portion. The medical needle according to (3).
(5) The folding restricting portion includes an elastically deformable locking piece, the folding piece includes an insertion hole into which the locking piece can be inserted, and the insertion is performed while the locking piece is elastically deformed. The medical needle according to any one of (2) to (4), wherein the locking piece inserted into the hole and elastically restored is locked to the folding piece.
(6) The needle body is a Huber needle in which the needle tip is bent, and the needle tip is bent in an insertion direction or an insertion reverse direction of the locking piece. .
(7) The folding restricting portion includes a pair of the locking pieces facing each other, and a slit portion formed between the locking pieces, and the slit portion has a bending direction of the needle tip. The medical needle according to (6), which is arranged in parallel.
(8) The above (6), wherein the upper end opening corresponding to the proximal end side of the needle body in the needle hole is larger in diameter toward the side opposite to the bending direction of the needle tip than the lower end opening corresponding to the needle tip side. Or the medical needle as described in (7).
(9) A needle tip receiving groove in which the needle tip that is pulled up higher than the upper end opening is movable continuously from the upper end opening of the needle hole to the proximal end side of the needle body. The medical needle according to (8), wherein the medical needle is formed extending in the bending direction.
(10) A peripheral wall is provided around the needle tip receiving groove, and the needle support portion is moved until the deployment structure is in the deployed state and a separation distance between the base portion and the needle support portion is restricted. The medical needle according to (9), wherein the needle tip is positioned lower than the peripheral wall in a state where the needle is pulled up from the base portion.
(11) Any one of the above (1) to (10), further including a holding portion that releasably holds the unfolded structure in the folded state and the needle tip protruding downward from the needle hole. The medical needle described in 1.
(12) The medical needle according to (11), wherein the holding portion releasably locks the needle support portion and the base portion.

DESCRIPTION OF SYMBOLS 10 Needle body 11 Needle tip 20 Base part 21 Upper end opening 22 Needle hole 23 Lower end opening 24 First part 25 Bottomed recessed part 26 Second part 27 Head base part 30 Contact part 32 Mounting hole 34 Lock member 35 Claw part 36 Cut part 40 Needle support portion 46 Liquid supply tube 52 Deployment structure 53, 54 Folding piece 56 Insertion hole 57 Lower end hinge 58 Upper end hinge 60 Holding portion 80 Needle tip receiving groove 82 Perimeter wall 83 Bottom portion 90 Folding restriction portion 92 Locking piece 93 Return portion 94 Slit part 95 Projection piece 100 Medical needle θ Bending angle

Claims (12)

A base portion having a needle hole;
A needle body having a sharp needle tip and provided through the needle hole;
A needle support portion that holds the needle body and moves the needle body in the pulling direction with respect to the needle hole by being separated from the base portion;
A plurality of folding pieces are connected to each other so as to be foldable, transition to a folded state and a deployed state, and a deployment structure in which both ends are respectively connected to the needle support part and the base part,
A folding restricting portion that locks with the unfolded structure in the unfolded state and restricts the folding operation of the unfolded structure,
By pulling up the needle support portion from the base portion, the unfolded structure transitions from the folded state to the unfolded state, and the needle tip is immersed in the needle hole,
The medical needle in which the retracted needle tip is restricted from projecting from the needle hole when the folding restricting portion restricts the folding operation of the deployed structure in the deployed state.   The medical needle according to claim 1, wherein the folding restricting portion locks the base portion and the folding piece to restrict movement of the needle body and the needle support portion. The plurality of folding pieces are connected in series so that they can be folded together.
The fold restricting portion restricts rotation of the foldable piece by locking the foldable piece and the base portion, which are arranged closest to the base portion and rotatably connected to each other. 2. The medical needle according to 2. The adjacent folding pieces connected to each other are allowed to fold in one direction and are restricted from folding in the other direction.
In the state where the needle support part is pulled up from the base part and the unfolded structure is in the unfolded state and the foldable piece is locked to the foldable restricting part, the unfolded folded piece is in the one direction. The medical needle according to claim 2 or 3, wherein the folding operation is restricted. The folding restricting portion includes an elastically deformable locking piece,
The folding piece includes an insertion hole into which the locking piece can be inserted,
The medical needle according to any one of claims 2 to 4, wherein the locking piece is inserted into the insertion hole while being elastically deformed, and the locking piece that has been elastically restored is locked to the folding piece.   The medical needle according to claim 5, wherein the needle body is a Huber needle in which the needle tip is bent, and the needle tip is bent in an insertion direction or an insertion reverse direction of the locking piece. The folding restricting portion includes a pair of locking pieces facing each other, and a slit portion formed between the locking pieces,
The medical needle according to claim 6, wherein the slit portion is disposed in parallel with a bending direction of the needle tip.   The upper end opening corresponding to the base end side of the needle body in the needle hole is larger in diameter toward the opposite side of the bending direction of the needle tip than the lower end opening corresponding to the needle tip side. Medical needles.   A needle tip receiving groove in which the needle tip, which is continuously higher than the upper end opening of the needle hole and can be moved higher than the upper end opening, is movable further toward the proximal end side of the needle body. The medical needle according to claim 8, wherein the medical needle is formed so as to extend. A peripheral wall is provided around the needle tip receiving groove,
The needle tip is lower than the peripheral wall in a state in which the needle support portion is pulled up from the base portion until the deployment structure is in the deployed state and a separation distance between the base portion and the needle support portion is restricted. The medical needle according to claim 9, which is located in   The medical needle according to any one of claims 1 to 10, further comprising a holding portion that releasably holds a state in which the unfolded structure is in the folded state and the needle tip protrudes downward from the needle hole. .   The medical needle according to claim 11, wherein the holding portion releasably locks the needle support portion and the base portion.

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