Puncture needle

Abstract

To provide a puncture needle which can be easily treated after use.SOLUTION: A puncture needle 1 includes a needle tube 2, a needle base 3 that supports a base portion of the needle tube 2, and a covering tool 4 that can cover a needle tip 21 of the needle tube 2. The covering tool 4 includes a tubular protector 41 that covers an outer periphery of the needle tube 2 and is movable forward and backward along a length direction of the needle tube 2, and a tubular protector base 42 that supports a base portion of the protector 41 and moves the protector 41 forward and backward according to a forward and backward operation along the length direction of the needle tube 2. The needle base 3 includes a first lock part 34 that locks the forward and backward operation of the protector base 42 at a first position and can release the lock, and a second lock part 35 that locks the forward and backward operation of the protector base 42 at a second position and can release the lock. The covering tool 4 causes the tip of the needle tube 2 to be exposed while covering the intermediate portion and the base portion of the needle tube 2 when the protector base 42 is at the first position, and covers a whole area in the length direction of the needle tube 2 when the protector base 42 is at the second position.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a puncture needle such as an egg collection needle. [Background technology]

[0002] Currently, medical puncture needles have a sharp tip, and attempts have been made to prevent medical accidents by covering the tip with a covering means before disposal after use. One such covering means proposed is a puncture needle with foldable wings that can be unfolded (extended) to cover the needle tip after use (see, for example, Patent Document 1). However, while this is effective for short puncture needles, for puncture needles with long needle tubes, such as egg collection needles, the wings protrude far in the left-right direction even when folded, making it impractical.

[0003] Therefore, it has been proposed to provide a detachable covering device at the base end of the puncture needle, which can be freely inserted into the needle tube, and after use, the covering device can be moved toward the needle tip to cover the needle tip (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-136409 [Patent Document 2] International Publication No. 2023 / 090462 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the puncture needle described in Patent Document 2, the stroke of movement of the covering tool after use becomes longer according to the length of the needle tube, which poses a problem of requiring time and effort for disposal after use. [Means for solving the problem]

[0006] The present invention has been made in view of the above-mentioned circumstances and with the aim of solving these problems. The invention of claim 1 is a puncture needle comprising a needle tube, a needle hub supporting the base of the needle tube, and a covering device capable of covering the needle tip of the needle tube, wherein the covering device comprises a tubular protector that covers the outer periphery of the needle tube and is movable back and forth along the length of the needle tube, and a cylindrical protrusion that supports the base of the protector and moves the protector back and forth in response to an operation of moving the protector back and forth along the length of the needle tube. and a protector base, wherein the needle base comprises a first locking portion that locks the advancement / retraction operation of the protector base at a first position and is capable of releasing the lock, and a second locking portion that locks the advancement / retraction operation of the protector base at a second position and is capable of releasing the lock, and the covering device covers the middle portion and base portion of the needle tube while exposing the tip portion of the needle tube when the protector base is at the first position, and covers the entire longitudinal area of ​​the needle tube when the protector base is at the second position. The invention of claim 2 is the puncture needle described in claim 1, characterized in that when the protector base is in the first position, the length of the exposed needle tube is 1 / 2 or less of the length of the needle tube covered by the protector. The invention of claim 3 is the puncture needle according to claim 1 or 2, wherein the base end of the protector base has an engaging protrusion protruding outward, the first locking portion has a first engaging groove that engages and disengages with the engaging protrusion in response to a rotational operation of the protector base about the needle tube when the protector base is located at the first position, and the second locking portion has a second engaging groove that engages and disengages with the engaging protrusion in response to a rotational operation of the protector base about the needle tube when the protector base is located at the second position. [Effects of the Invention]

[0007] According to the invention of claim 1, when the protector base is in the first position, the covering device covers the intermediate portion and base portion of the needle tube while exposing the tip portion of the needle tube, so that the needle can be used as a puncture needle with only the tip portion of the needle tube exposed. After use, by setting the protector base to the second position, the entire longitudinal length of the needle tube is covered by the covering device, allowing the puncture needle to be safely disposed of after use. Furthermore, the stroke of the protector base's advance / retract operation is shorter than when the entire longitudinal length of the needle tube is exposed during use, making disposal after use easier. Furthermore, even before use, by setting the protector base to the second position and covering the entire longitudinal length of the needle tube with the covering device, not only can the puncture needle be handled safely before use, but contamination of the needle tube before use can also be prevented. Furthermore, according to the invention of claim 2, when the protector base is in the first position, the length of the exposed needle tube is less than half the length of the needle tube covered by the protector, so that the stroke of the advance / retract operation of the protector base can be significantly shortened. Furthermore, according to the invention of claim 3, the structures of the first locking portion and the second locking portion can be simplified, thereby reducing costs. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are perspective views showing the states of a puncture needle according to an embodiment of the present invention before and after use. [Figure 2] FIG. 1 is a perspective view showing a state in which a puncture needle according to an embodiment of the present invention is in use. [Figure 3] FIG. 1 is an exploded perspective view of a puncture needle according to an embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of a main part of FIG. 1. [Figure 5] 5A and 5B are cross-sectional views taken along the line AA in FIG. 4, where (a) is a cross-sectional view taken along the line AA showing the second locking portion in a locked state, and (b) is a cross-sectional view taken along the line AA showing the second locking portion in an unlocked state. [Figure 6] FIG. 3 is a cross-sectional view of a main part of FIG. 2. [Figure 7] 7A and 7B are cross-sectional views taken along the line BB in FIG. 6, where (a) is a cross-sectional view taken along the line BB showing the locked state of the first locking part, and (b) is a cross-sectional view taken along the line BB showing the unlocked state of the first locking part. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Puncture needle] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In Figures 1 to 3, reference numeral 1 denotes a puncture needle, which has a long (e.g., 200 to 400 mm) needle tube 2 and is used, for example, as an egg collection needle.

[0010] The puncture needle 1 includes a needle tube 2, a needle hub 3 that supports the base of the needle tube 2, and a covering tool 4 that can cover the needle tip 21 of the needle tube 2.

[0011] The needle tube 2 may be either a straight needle with a constant thickness or a tapered needle that tapers toward the tip. The needle tube 2 does not puncture the entire length of the area to be punctured (for example, the area L shown in FIG. 2 ) but only the tip region including the needle tip 21 (for example, the area L1 shown in FIG. 2 ). In particular, with special needles such as egg collection needles, the length of the tip region, which is the puncture region, is often half or less the length of the other region (for example, the area L2 shown in FIG. 2 ).

[0012] The needle hub 3 is a cylindrical member made of resin and includes a needle support portion 31 that supports the base end of the needle 2, a connection portion 32 to which a syringe (not shown) or the like can be connected, a guide portion 33 that guides the advance / retract and rotation of a protector base 42 (described later), a first lock portion 34 that locks the advance / retract movement of the protector base 42 at a first position (see FIGS. 2 and 6), and a second lock portion 35 that locks the advance / retract movement of the protector base 42 at a second position (see FIGS. 1 and 4). The guide portion 33, the first lock portion 34, and the second lock portion 35 will be described later.

[0013] The covering device 4 includes a tubular protector 41 that covers the outer periphery of the needle tube 2 and can move back and forth along the longitudinal direction of the needle tube, and a cylindrical protector base 42 that supports the base of the protector 41 and moves the protector 41 back and forth in response to an operation of moving the protector back and forth along the longitudinal direction of the needle tube 2.

[0014] The protector 41 of this embodiment is made of metal such as stainless steel, but may be made of resin as long as it has enough strength to not be broken through by the needle tip 21 that it covers.

[0015] The protector base 42 includes a protector support portion 42a that supports the base end of the protector 41, a flange portion 42b that protrudes from the tip end toward the outer periphery and is operated with a finger when moving the protector base 42 back and forth or when rotating the protector base 42, and an engaging protrusion 42c that protrudes from the base end toward the outer periphery.

[0016] As shown in Fig. 2, when the protector base 42 is in the first position, the covering device 4 covers the middle and base of the needle tube 2 while exposing the tip of the needle tube 2. In this state, the puncture needle 1 becomes usable. In this state, the length L1 of the exposed needle tube 2 is half or less of the length L2 of the needle tube covered by the protector 41, but for the reasons described above, it can be used without any problems in applications such as an egg collection needle.

[0017] 1, when the protector base 42 is in the second position, the covering device 4 covers the entire longitudinal area of ​​the needle tube 2. In this state, the puncture needle 1 can be safely disposed of after use. Furthermore, even before use, if the entire longitudinal area of ​​the needle tube 2 is covered with the covering device 4, not only can the puncture needle 1 be handled safely, but contamination of the needle tube 2 can also be prevented before use.

[0018] Next, the guide portion 33, the first lock portion 34, and the second lock portion 35 of the hub 3 will be described with reference to FIGS.

[0019] The guide portion 33 of the needle base 3 comprises an inner peripheral portion 33a that supports the outer peripheral portion of the protector base 42 so that it can move back and forth and rotate, and a guide groove 33b that is formed on the inner peripheral portion 33a along the longitudinal direction of the needle tube 2 and engages with the engaging protrusion 42c of the protector base 42, thereby restricting the rotation of the protector base 42 at positions other than the first position and the second position.

[0020] The first locking portion 34 has a first engaging groove 34a that engages with and disengages from the engaging protrusion 42c of the protector base 42 in response to a rotation operation of the protector base 42 around the needle tube 2 when the protector base 42 is located at the first position.

[0021] For example, when the protector base 42 is moved to the first position as shown in Fig. 6, the engaging protrusion 42c of the protector base 42 reaches the entrance of the first engaging groove 34a as shown in Fig. 7(b), and when the protector base 42 is rotated in a predetermined direction at this point, the engaging protrusion 42c enters the inner side of the first engaging groove 34a and enters an engaged state, locking the advancement and retraction of the protector base 42 as shown in Fig. 7(a). Also, when the reverse operation is performed, the engagement of the engaging protrusion 42c is released, allowing the advancement and retraction of the protector base 42.

[0022] The second locking portion 35 has a second engaging groove 35a that engages with and disengages from the engaging protrusion 42c of the protector base 42 in response to a rotation operation of the protector base 42 around the needle tube 2 when the protector base 42 is located at the second position.

[0023] For example, when the protector base 42 is moved to the second position as shown in Fig. 4, the engaging protrusion 42c of the protector base 42 reaches the entrance of the second engaging groove 35a as shown in Fig. 5(b), and when the protector base 42 is rotated in a predetermined direction at this point, the engaging protrusion 42c enters the inner side of the second engaging groove 35a and enters an engaged state, locking the advancement and retraction of the protector base 42 as shown in Fig. 5(a). Also, when the reverse operation is performed, the engagement of the engaging protrusion 42c is released, allowing the advancement and retraction of the protector base 42.

[0024] [Effects of the embodiment] According to this embodiment configured as described above, the puncture needle 1 includes a needle tube 2, a needle hub 3 that supports the base of the needle tube 2, and a covering device 4 that can cover the needle tip 21 of the needle tube 2. The covering device 4 includes a tubular protector 41 that covers the outer periphery of the needle tube 2 and is movable forward and backward along the length direction of the needle tube 2, and a cylindrical protector base 42 that supports the base of the protector 41 and moves the protector 41 forward and backward in response to the forward and backward operation along the length direction of the needle tube 2. The needle hub 3 controls the forward and backward operation of the protector base 42 to move between a first position and a second position. and a second locking part 35 which locks the advancement / retraction operation of the protector base 42 at a second position and can release the lock. When the protector base 42 is in the first position, the covering device 4 covers the intermediate part and base part of the needle tube 2 while exposing the tip part of the needle tube 2, and when the protector base 42 is in the second position, the covering device 4 covers the entire longitudinal area of ​​the needle tube 2. Therefore, when the protector base 42 is in the first position, the needle tube 2 can be used as a puncture needle 1 with only the tip part of the needle tube 2 exposed. After use, when the protector base 42 is in the second position, the entire longitudinal area of ​​the needle tube 2 is covered by the covering device 4, so the puncture needle 1 can be safely disposed of after use. Furthermore, the advancement / retraction stroke of the protector base 42 is shorter than when the entire longitudinal area of ​​the needle tube 2 is exposed during use, making disposal after use easier. Furthermore, even before use, if the protector base 42 is set to the second position and the entire longitudinal length of the needle tube 2 is covered with the covering device 4, not only can the puncture needle 1 be handled safely before use, but contamination of the needle tube 2 before use can also be prevented.

[0025] Furthermore, when the protector base 42 is in the first position, the length L1 of the exposed needle tube 2 is less than half the length L2 of the needle tube 2 covered by the protector 41, so that the stroke of the advance / retract operation of the protector base 42 can be significantly shortened.

[0026] Furthermore, the base end of the protector base 42 has an engaging protrusion 42c that protrudes outward, and the first locking portion 34 has a first engaging groove 34a that engages and disengages with the engaging protrusion 42c in response to the rotational operation of the protector base 42 about the needle tube 2 when the protector base 42 is located at the first position, and the second locking portion 35 has a second engaging groove 35a that engages and disengages with the engaging protrusion 42c in response to the rotational operation of the protector base 42 about the needle tube 2 when the protector base 42 is located at the second position, thereby simplifying the structures of the first locking portion 34 and the second locking portion 35 and reducing costs. [Explanation of symbols]

[0027] 1 Puncture needle 2 needle tube 21 Needle tip 3 Needle base 31 Needle tube support part 32 Connection 33 Guide section 33a Inner circumference 33b Guide groove 34 First Lock 34a 1st engagement groove 35 Second Lock 35a 2nd engagement groove 4 Coverings 41 Protector 42 Protector group 42a Protector support part 42b flange 42c Engagement protrusion

Claims

1. A needle tube and a needle base that supports a base of the needle tube; A puncture needle comprising: a covering device capable of covering the needle tip of the needle tube, The covering device includes: a tubular protector that covers the outer periphery of the needle tube and is movable back and forth along the length of the needle tube; a cylindrical protector base that supports a base portion of the protector and moves the protector forward and backward in response to an advance / retract operation along the longitudinal direction of the needle tube, The needle hub is a first locking portion that locks the advancement / retraction operation of the protector base at a first position and is capable of releasing the lock; a second locking portion that locks the advancement / retraction operation of the protector base at a second position and is capable of releasing the lock, The covering device includes: When the protector base is in the first position, the protector base covers the intermediate portion and the base portion of the needle tube while exposing the tip portion of the needle tube; The puncture needle is characterized in that, when the protector group is in the second position, it covers the entire length of the needle tube.

2. 2. The puncture needle according to claim 1, wherein when the protector base is in the first position, the length of the exposed needle tube is equal to or less than half the length of the needle tube covered by the protector.

3. The base end of the protector base has an engaging protrusion protruding outward from the outside, the first locking portion includes a first engaging groove that engages with and disengages from the engaging protrusion in response to a rotation operation of the protector base about the needle tube when the protector base is located at the first position, The puncture needle according to claim 1 or 2, characterized in that the second locking portion has a second engagement groove that engages with and disengages from the engagement protrusion in response to a rotational operation of the protector base about the needle tube when the protector base is located at the second position.

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