JP2007195827A - Safety needle assembly with curved portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a needle pricking accident by providing a safety type needle assembly added with an erroneous pricking prevention mechanism. <P>SOLUTION: This needle assembly is provided with a needle formed with an edge at the distal end and having a curved portion, a hub retaining the proximal end of the needle, a grip section fitted with the distal end of the hub and extending in the distal end direction, and a fixing section; a tube surrounding the needle is provided outside the needle; the fixing section has a through-hole for penetrating the needle; the tube and the fixing section are connected so as to connect the distal end of the tube to the through-hole; the tube extends from the fixing section in the direction of the proximal end of the needle and its one part or the whole parts are positioned inside the grip; the fixing section is detachably fixed to the grip section and, when the fixing section is moved to the needle distal end direction so as to position the through-hole of the fixing section in the same position to the needle tip of the needle or frontward the needle tip, the tube covers the exposed portion of the needle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a safety needle assembly using a needle having a curved portion, and more particularly to a Hoover needle assembly which is a puncture needle for a subcutaneously implantable catheter access port. More particularly, the present invention relates to a Hoover needle assembly provided with a safety mechanism for preventing a needle stick accident that can cover the entire exposed portion of the needle when the Hoover needle assembly punctured in the catheter access port is removed.

  In a medical needle, for example, a needle that punctures a subcutaneously implantable catheter access port is not a general injection needle, but a blade surface that does not cause coring during septum piercing of the port is perpendicular to the puncture direction. A Hoover needle having a shape to be used is generally used. Especially, the thing which has the curved part bent 90 degrees in the middle of a needle | hook, and added the wing | blade parallel to a horizontal direction is used for uses, such as a continuous administration.

  In the needle assembly including such a Hoover needle assembly having wings parallel to the horizontal direction, the medical staff and the patient himself may inadvertently puncture the used needle with respect to the needle to be punctured. It has been a problem. It is also recognized that simply scratching the skin with a used, unprotected, sharp needle is sufficient to develop an infection. In the US, the “Needlestick Safety and Prevention Act Needle Sting Accident Prevention Act” has been enacted, and a safety type needle assembly, especially a safety hoover needle assembly is required.

  In order to prevent the above problems, as a safety type needle assembly having a curved portion, for example, a flat wing moves between a protective position where contact with the tip of the needle is prevented. A wing foldable needle assembly having an approximately 90 ° curved portion is known (see Patent Document 1).

Special table 2004-510555

  In the above-described safety type needle assembly, it is possible to prevent erroneous puncture because it is difficult for the fingertip to come into contact with the needle simply by folding the wing. Therefore, the needle assembly can prevent erroneous puncture by a simple operation.

  However, since the needle assembly prevents the wing from returning due to the shallow detent portion, the needle tip only prevents contact between the human body and the needle due to a light touching force. It is difficult to prevent the exposure of the needle due to the great force on the needle.

  Further, the needle assembly is not a structure that entirely covers the portion of the needle that contacts the living body. Therefore, there is a possibility that the bodily fluid adhering to the needle may be scattered, and there is a risk of infection such as HIV or hepatitis due to the scattered bodily fluid.

  The present invention provides a safety-type needle assembly having a curved portion to which an erroneous puncture prevention mechanism is added, and in particular, provides a safety-type Hoover needle assembly for the purpose of preventing a needle stick accident.

That is, the present invention relates to a needle having a cutting edge formed at the tip and having a curved portion, a hub that holds the proximal end portion of the needle, and a gripping portion that fits the tip portion of the hub and extends in the tip direction. And a needle assembly including a fixing part,
A tube surrounding the needle is provided outside the needle,
The fixed portion has a needle passage through which the needle can move in the axial direction,
The tube and the fixed portion are connected so that the tip of the tube and the needle passage communicate with each other;
The tube extends from the fixed portion toward the proximal end of the needle, and part or all of the tube is present inside the grip portion,
The fixing portion is detachably fixed to the grip portion,
The tube covers the exposed portion of the needle when the fixing portion is moved in the direction of the needle tip so that the needle passage of the fixing portion is at the same position as the needle tip of the needle or in front of the needle tip. A needle assembly characterized by the following. The present invention is also a needle assembly using a Hoover needle as the needle.

  Since the present invention is a needle assembly as described above, it is useful as a puncture needle for a subcutaneously implantable catheter access port, and can be suitably used for a treatment method using a catheter. Further, the needle assembly of the present invention is excellent in safety because it can be used to protect the cutting edge at the same time that the needle is removed from the living body. Moreover, since the needle assembly of the present invention has a structure that covers the entire needle, it is possible to reduce scattering of blood and body fluid adhering to the side surface of the needle.

  The needle assembly of the present invention can shield the exposed portion of the needle including the needle tip with a tube by pulling the fixed portion away from the needle gripping portion after use of the needle exposed at the time of use. So it is safe. Hereinafter, it demonstrates using drawing.

  FIGS. 1A and 1B are cross-sectional views of one embodiment of the needle assembly of the present invention. 2 (a) and 2 (b) are perspective views of the appearance when the needle assembly of FIG. 1 is observed obliquely forward from above. The needle assembly 1 includes a needle 2 having a curved portion 21 of approximately 90 °, a hub 3 that holds the proximal end portion of the needle, a gripping portion 4 that fits to the outer periphery of the distal end portion 31 of the hub 3, and a living body. And a fixing part 5 fixed to the skin of the needle assembly. The curved portion 21 of the needle 2 is formed between the needle tip formed at the distal end and the proximal end. The needle is mounted on a hub that is substantially horizontal with respect to the surface on which the living body is placed, and the needle tip is directed downward due to the curvature. In the embodiment shown in FIG. 1, a Hoover needle having a shape in which the blade surface is perpendicular to the puncture direction is used as the needle 2. However, if the needle has a curved portion, the opening is the front end of the needle. It is also possible to use the needle in Although the bending of the bending portion is approximately 90 ° in FIG. 1, it is not particularly limited to approximately 90 °. However, it is possible to stab a living body by simply holding the gripping part with a finger and pressing it from above, and since the pipe extends in the horizontal direction with the installation surface, the arrangement of the pipe is also easy. The curvature is preferably approximately 90 °.

  In the embodiment shown in FIG. 1, the grip portion 4 is fitted so that the inner surface thereof is in contact with the outer periphery of the distal end portion of the hub 3, and extends from the proximal direction of the needle 2 to the distal direction along the axis of the needle. Extended

  A tube 6 surrounding the needle 2 is provided outside the needle 2. An inner space is provided inside the grip portion 4, and a needle having a tube 6 on the outside is present in the inner space. The distal end of the tube 6 is connected to the fixed portion 5 so that the needle passage 51 of the fixed portion 5 and the lumen of the tube 6 communicate with each other.

  The tube 6 is fixed to the fixing portion 5 at the tip thereof. The tube 6 is fitted into a fitting groove formed by a hollow cylindrical outer convex portion 52 and a hollow cylindrical inner convex portion 53 provided around the needle passage 51 to prevent the needle tip from protruding. It is preferable to be fixed to the fixing portion 5. The tube 6 extends from the fixed portion toward the proximal end of the needle, and a part of the tube 6 is accommodated inside the grip portion.

  In the embodiment example of FIG. 1, the needle 2 passes through the needle passage 51 of the fixing portion 5, and the fixing portion 5 and the grip portion 4 are fixed. The fixing portion and the gripping portion are engaged with an engagement hole 55 formed in the connection portion 54 of the fixing portion 5 and an engagement protrusion 41 formed with a slight turn at the tip provided below the gripping portion. Therefore, the fixed part and the gripping part are in a fixed state. By fixing the fixing unit 5 to the living body and pulling up the grasping unit 4, the fixing unit 5 is detached from the grasping unit 4, and the needle passage 51 of the fixing unit 5 is located at the same position or the tip of the needle 2 of the needle 2. When the fixing portion 5 is moved in the needle tip direction so as to be in front, the tube 6 covers the exposed portion of the needle.

  The proximal end portion of the tube 6 is provided with a detent portion 61 on the outer periphery, and when the fixed portion 5 continues to move in the direction of the needle tip, the detent and the inner convex portion 42 provided at the distal end of the grip portion are detained. Engagement with the part 61 restricts the movement of the tube 6 so that the tube 6 and / or the fixing part 5 can easily cover the exposed part of the needle.

  In the embodiment example of FIG. 1, in FIG. 1 (b), the needle passage 51 exceeds the needle tip and the tube covers the portion where the needle is exposed. However, the present invention is limited to such an embodiment. In the case where the fixing portion 5 is provided with a closing mechanism, the needle tip may be protected by the fixing portion. As the closing mechanism, for example, an urging member or a slide member that can be slid by a magnetic force can be provided inside the fixing portion 51. In particular, when a slide member slidable by magnetic force is used, the state in which the slide is suppressed is released by pulling out the needle 2 that has been in contact with the slide member and the shaft, and the slide member is released from the needle path. Since 51 is closed, the protection of the needle tip can be facilitated. 1, the needle 2 is a Hoover needle having a shape in which the blade surface is perpendicular to the puncture direction, so that the vicinity of the tip is bent at the shaft tip 22. Therefore, when the fixed portion 5 exceeds the needle tip of the needle 2, the needle tip of the needle 2 comes into contact with the hollow cylindrical inner convex portion 53, so that the needle tip does not jump out from the through hole of the needle. Safely protected.

  An end portion of a tube 7 for conveying a medicine or the like is connected to the proximal end portion of the hub 3. The material of the tube 7 is not particularly limited as long as it does not interfere with the conveyance of a medicine or the like and has flexibility.

  The tube 6 is a straight tube in the inner space of the grip portion 4, and the material is not particularly limited as long as it can follow the shape of the needle and slide and move on the outer surface of the needle. Absent. As the tube 6 material, it is preferable that the tube itself has elasticity in the bending direction because it is easy to move (slide) at the bent portion, and the needle tip protected by the expansion and contraction of the tube itself breaks the tube. It is more preferable to have a strength and / or expansion / contraction rate that does not cause this. In the case where the tube exhibits elastic characteristics as a bellows-like structure, a large space for housing the bellows-like contracted tube is required in the inner space of the grip portion 4, and the size reduction is achieved. It becomes difficult. In addition, when the tube contracted in a bellows shape has an appropriate thickness for protecting the needle, stress to return to the stretched state works, so that the tube before use as shown in FIG. To achieve the state, a robust attachment mechanism for the fixing portion is required, and the structure becomes complicated. In addition, when the needle tip protrusion prevention mechanism has a simple shape as shown in FIG. 2B, there is a risk that the needle tip may protrude due to contraction of the bellows if an impact is applied to the fixing portion even a little. A closing mechanism must be provided, which complicates the shape.

  As shown in FIG. 2, in the embodiment of FIG. 1, the grip 4 is composed of two parts, one hub component 43 and the other hub component 44, and the hub components 43, 44 Overhang portions 45 and 46 are provided. The grip portion 4 is attached to the hub so that the hub 3 and the tube are sandwiched from the left and right by the hub components. As shown in FIG. 3, the hub component 43 includes a hole 47 into which a convex portion of the hub is inserted and a locking claw 48. By inserting the convex portion of the hub into the hole 47, the grip portion can be easily fixed to the hub. Moreover, the convex part 49 of the latching claw 48 will pinch the movement stop part 61 with the inner side convex part 42, and it is suppressed that the tube 6 moves to a base end part direction. Similarly, the other hub component 44 includes a hole into which the convex portion of the hub is inserted and a locking claw. The needle assembly according to this embodiment is used by holding the overhanging portions 45 and 46 from the outside with fingers.

  1 and 2, the number of the engagement holes 55 of the fixing portion 5 is two, but may be three as shown in FIG. 4, and a plurality of four or more may be provided. In addition, it is preferable that an engagement protrusion is provided corresponding to the number of holes.

  5 and 6 are modifications of the needle assembly of FIG. The tube 6 is provided so as to surround the needle 2, and the fixed portion 5 connected to the tip of the tube 6 moves beyond the needle tip to cover the exposed portion of the needle with the tube. The general configuration is common to the modification and the embodiment shown in FIG. 5 and 6, an extending portion 410 is provided at the tip of the gripping portion, and extends in the needle tip direction beyond the curved portion of the needle. In the modified example, similar to the embodiment of FIG. 1, the protrusion 49 of the locking claw 48 is located at the proximal end of the detent portion provided on the outer periphery of the tube proximal end near the distal end of the gripping portion. The latching claw which suppresses the movement to a direction is provided.

  In the modification, the plate-like convex portion 8 for connection is provided below the gripping portion, and a linear convex portion 81 parallel to the needle is provided on the surface of the plate-like convex portion 8. The linear convex portions are fitted into grooves 57 of a pair of sandwiching convex portions 56 provided on the fixed portion 5 as connecting portions, and the pair of sandwiching convex portions sandwich the plate-shaped convex portion 8. In form, the fixed part is connected to the gripping part.

  In the modification, the gripping part is connected to the fixed part in a form in which the plate-like convex part is sandwiched by the convex part for clamping, but the form in which the fixed part is attached is not particularly limited, It may be the same form as the embodiment shown in FIG.

  In the embodiment of FIGS. 1-6, the needle passage is shown as a hole. However, the needle passage is not particularly limited as long as the needle can penetrate from above without contacting the wing portion, and may be a hole. Further, as shown in FIGS. 7 and 8, the needle passage may have a shape in which a part of the side surface of the hole is opened in the needle axis direction by a notch 9 from the peripheral edge of the wing portion.

FIG. 1A is a cross-sectional view of the needle assembly according to an embodiment of the present invention in use. (B) Sectional drawing at the time of covering the needle | hook of the embodiment of the needle | hook assembly of this invention. FIG. 2A is a perspective view of the appearance when the needle assembly of FIG. 1A is observed obliquely from above. (B) The perspective view of the external appearance at the time of observing the needle assembly of FIG.1 (b) from diagonally forward upper direction. The perspective view of one hub component. FIG. 4A is a perspective view when the embodiment of the needle assembly of the present invention is used when the number of fixing holes is three. (B) The perspective view at the time of covering the needle | hook of the embodiment example of the needle | hook assembly of this invention at the time of using three fixing holes. (A) The perspective view at the time of use of the modification of the needle | hook assembly of FIG. 1 of this invention. (B) The perspective view at the time of covering the needle | hook of the perspective view of the modification of the needle | hook assembly of FIG. 1 of this invention. (A) Sectional drawing in the needle | hook assembly of Fig.5 (a) of this invention. (B) Sectional view of the needle assembly of FIG. 5 (b) of the present invention. (A) The perspective view at the time of use of the embodiment of this invention which provided the notch in the fixing | fixed part in the embodiment of FIG. (B) The perspective view at the time of covering the needle | hook of the embodiment example of this invention which provided the notch in the fixing | fixed part in the embodiment example of FIG. (A) The perspective view at the time of use of the example of embodiment of this invention which provided the notch in the fixing | fixed part in the example of embodiment of FIG. (B) The perspective view at the time of covering the needle | hook of the example of embodiment of this invention which provided the notch in the fixing | fixed part in the example of embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Needle assembly 2 Needle 21 Bending part 3 Hub 31 Tip part 4 Holding part 41 Connection protrusion 42 Inner convex parts 43 and 44 Hub component parts 45 and 46 Overhang | projection part 47 Hole 48 Locking claw 49 Locking claw convex part 5 Fixing portion 51 Needle passage 52 Outer convex portion 53 Inner convex portion 54 Connection portion 55 Engaging hole 56 Holding convex portion 57 Groove 6 Tube 61 Detent portion 7 Tube 8 Plate-like convex portion 81 Linear convex portion 9 Cut

Claims (8)

A needle having a cutting edge formed at the tip and having a curved portion; a hub that holds the proximal end of the needle; a gripping portion that fits into the tip of the hub and extends in the direction of the tip; A needle assembly comprising:
A tube surrounding the needle is provided outside the needle,
The fixed portion has a needle passage through which the needle can move in the axial direction,
The tube and the fixed portion are connected so that the tip of the tube and the needle passage communicate with each other;
The tube extends from the fixed portion toward the proximal end of the needle, and part or all of the tube is present inside the grip portion,
The fixing portion is detachably fixed to the grip portion,
The tube covers the exposed portion of the needle when the fixing portion is moved in the direction of the needle tip so that the needle passage of the fixing portion is at the same position as the needle tip of the needle or in front of the needle tip. Needle assembly characterized by. A detent portion is provided at the proximal end of the tube, and the movement of the fixed portion in the distal direction is limited by engaging the detent portion and a convex portion provided at the distal end of the grip portion. Item 2. The needle assembly according to Item 1. The needle assembly according to claim 1, wherein the fixing portion includes a return prevention mechanism that prevents the fixing portion from moving in the proximal direction of the needle. The needle assembly according to claim 1, wherein the return prevention mechanism confines the needle tip by a closing mechanism. The anti-return mechanism has an axial change portion formed in the vicinity of the needle tip of the needle so that the needle tip and the fixing portion are in contact with each other, whereby the fixing portion moves in the needle proximal direction. The needle assembly according to claim 1, wherein the needle assembly has a structure to be prevented. The needle assembly according to claim 1, wherein the tube itself has elasticity in a bending direction. The needle assembly according to any one of claims 1 to 6, wherein the needle is a Hoover needle. The needle assembly according to any one of claims 1 to 7, wherein the curved portion has a curvature of approximately 90 °.

Images