JP6126663B2 - Safety needle with tip and side covered - Google Patents

Description

  The present invention relates to a medical needle, and more particularly to a safety needle whose tip and side surfaces are covered after puncturing.

  Various medical needles are used for the purpose of introducing a medical solution or a catheter into a patient's body. After its use, the patient's blood or body fluid is attached to the medical needle, which is rarely contaminated with viruses such as HIV and hepatitis. Therefore, medical needles have the potential suspicion of transmitting infections.

  In order to prevent infection, an instrument that shields the tip of the needle after use has been proposed. Patent Documents 1 to 5 disclose related techniques. The instrument disclosed in Patent Document 4 can shield not only the tip of the needle 2 but also the side surface after the fixing member 5 has moved to the used position B. This state is maintained if the shutter 12 is operated, but if the operation is failed, the fixing member 5 may unintentionally retreat from the used position B. At this time, the tube body 7 may be detached from the needle 2 again, and the tip and side surfaces of the needle 2 may be exposed again.

International Publication No. WO90 / 06142 European Patent Publication No. 1935447 (A1) European Patent Publication No. 2338554 (A1) JP 2008-554 A Special table 2008-531236 gazette

  Some of the instruments described above shield the needle tip, but the side of the needle remains exposed. Such a device prevents infection caused by injury caused by a needle after use, but is not effective for the risk of an unspecified person touching the liquid attached to the side surface of the needle. Other instruments can shield not only the tip but also the side of the needle, but generally cannot prevent liquid from flowing out along the side of the needle or the inner surface of the instrument. We find a potential problem here and shield the side as well as the tip of the needle to retain the liquid attached to the needle and thus the potential problem that such liquid would cause We came up with a safety needle that can solve this problem.

According to one aspect of the present invention, a medical safety needle is dimensioned to shield a needle body having a needle tip and a side surface, the needle body being engageable with the side surface, and shielding the needle tip and the side surface. a flexible sheath, from a first position exposing the needle tip until detached from the second the needle body and the sheath passes through the position of the shield the needle tip is movable along said needle body The needle body and the sheath are slidably fitted, and the sheath is rubbed against the sheath so that the sheath is fitted to the needle body when moving from the first position to the second position. And a slider dimensioned accordingly.

FIG. 1 is a schematic perspective view of a safety needle according to an embodiment of the present invention. FIG. 2A is a schematic longitudinal sectional view of the safety needle in a state before use. FIG. 2B is a schematic longitudinal sectional view of the safety needle, showing a state where the slider is moved. FIG. 2C is a schematic longitudinal sectional view of the safety needle, showing a state where a sheath is fitted to the needle. FIG. 3A is a schematic cross-sectional view of a sheath according to the first example. FIG. 3B is a schematic cross-sectional view of a sheath according to the second example. FIG. 3C is a schematic cross-sectional view of a sheath according to a third example. FIG. 3D is a schematic cross-sectional view of a sheath according to a fourth example. FIG. 3E is a schematic cross-sectional view of a sheath according to a fifth example. FIG. 4A is a schematic longitudinal sectional view of a sheath without a cap body. FIG. 4B is a schematic longitudinal sectional view of a sheath having a cap body according to an example. FIG. 4C is a schematic longitudinal sectional view of a sheath having a cap body according to another example. FIG. 4D is a schematic longitudinal sectional view of a sheath having a solid cap body. FIG. 5A is a schematic elevation view of a sheath without a cap. FIG. 5B is a schematic elevation view of a sheath without a cap according to another example. FIG. 5C is a schematic elevation view of a sheath having a cap according to an example. FIG. 5D is a schematic elevation view of a sheath having a cap according to another example. FIG. 5E is a schematic elevational view of a sheath with an engaging structure. FIG. 6 is a schematic enlarged longitudinal sectional view showing in detail the relationship between the needle body, the sheath, and the slider corresponding to the state shown in FIG. 2B. FIG. 7A is a schematic cross-sectional view showing a slider provided with a shutter. FIG. 7B is a schematic top view of the slider as viewed from the direction of the needle tip. FIG. 7C is a schematic perspective view of the shutter. FIG. 7D is a schematic cross-sectional view showing a state where the shutter closes the through hole of the slider. FIG. 8A is a schematic cross-sectional view of a slider including a slider including a shutter according to a modification. FIG. 8B is a schematic cross-sectional view illustrating a state in which the shutter illustrated in FIG. 8A is retracted. FIG. 9A is a schematic elevation view showing a slider according to another modification. FIG. 9B is a schematic elevation view illustrating a state in which the shutter illustrated in FIG. 9A is retracted. FIG. 10 is a schematic longitudinal sectional view of a shutter and a slider according to still another modification. FIG. 11 is a schematic longitudinal sectional view showing in detail the relationship among a needle body, a sheath, and a slider according to a modification. FIG. 12 is a schematic longitudinal sectional view showing in detail the relationship between a needle body, a sheath, and a slider according to still another modification. FIG. 13 is a schematic perspective view of a safety needle according to another embodiment. 14A is a schematic longitudinal sectional view showing in detail the relationship between the needle body, the sheath and the slider in the safety needle shown in FIG. 14B is a schematic longitudinal sectional view showing a state in which the shutter shown in FIG. 14A is retracted. FIG. 15 is a schematic perspective view of a safety needle according to still another embodiment. 16A is a schematic cross-sectional view showing an example of a sheath applied to the safety needle shown in FIG. FIG. 16B is a schematic cross-sectional view showing another example of the sheath. FIG. 16C is a schematic cross-sectional view showing still another example of the sheath. FIG. 17 is a schematic perspective view of a safety needle according to another embodiment. FIG. 18 is a schematic elevational view of a safety needle according to still another embodiment, showing a partial cross-section. FIG. 19A is a schematic elevational sectional view of a safety needle according to still another embodiment, showing a state before use. FIG. 19B is a schematic elevational sectional view of the safety needle, showing a state where the slider is moved. FIG. 19C is a schematic elevational sectional view of the safety needle, showing a state where the needle tip is shielded.

  Several exemplary embodiments of the present invention are described below with reference to the accompanying drawings. Any of the safety needles according to these embodiments can be used for the purpose of introducing a liquid such as a drug or a tube such as a catheter into the patient's body. Of course, it can be applied not only to people but also to all living things and things. The following embodiment relates to an example applied to a catheter introducer, but is not limited to this, and can be applied to, for example, a syringe or the like.

  Referring to FIG. 1, a safety needle 1 according to an embodiment includes a needle body 3 that can be inserted into a patient's body, a sheath that can be fitted into the needle body 3, and shields the needle tip and side surfaces thereof. 5, a catheter 7 fitted to the needle body 3, a handle 9 to which the safety needle 1 is fixed, and a slider 11 for fitting the sheath 5 to the needle body 3 by moving in the needle tip direction. When the safety needle 1 is applied to a syringe, the catheter 7 is omitted and the handle 9 is a cylinder for injecting or extracting liquid.

  Referring to FIG. 2A in addition to FIG. 1, the needle body 3 may be hollow or solid, and has a needle tip 3p for puncturing the patient's body and a side surface. The needle body 3 is fixed to the shoulder 9a of the handle 9 at the proximal end opposite to the needle tip 3p. Fixing is performed by appropriate means such as press fitting. The proximal end of the needle body 3 may protrude into the handle 9 or may be buried in the shoulder 9a. In a state before use, the slider 11 is fitted to the needle body 3, and when the catheter is used, the catheter 7 is also fitted, and the side surfaces thereof are substantially shielded by these. The rear end of the catheter 7 may be fitted to the slider 11. The catheter 7 is retained in the patient's body after the needle is punctured into the patient's body.

  The slider 11 is in the first position in contact with the shoulder 9a of the handle 9 in the state shown in FIG. 2A. At this time, the needle tip 3p is exposed. The slider 11 is movable toward the needle tip 3p as shown in FIG. 2B. At this time, the sheath 5 is fitted into the needle body 3 by rubbing against the sheath 5. When the slider 11 further moves to the second position where the needle tip 3p is shielded, the sheath 5 is fitted to the needle tip 3p and the entire side surface to shield it. Alternatively, the sheath 5 may not be fitted to a part of the needle body 3. Thereafter, the user may further move the slider 11 to release it from the needle body 3 as shown in FIG. 2C.

  Throughout the specification and claims, the term “shield” means substantially preventing contact from the outside to the inside.

  The sheath 5 is made of a flexible material, and is fitted to the needle body 3 at or near the base end thereof, and both are fixed to the shoulder portion 9 a of the handle 9. In a state before use, the portion other than the proximal end of the sheath 5 or the vicinity thereof is separated from the needle body 3 and is pulled out from the side surface of the slider 11 as shown in FIG. 2A, for example. The sheath 5 has a shape that can be fitted to the needle body 3 as described later, and is dimensioned to shield substantially all of the needle tip 3p and the side surface of the needle when the sheath 5 is fitted to the needle body 3. . Examples of the flexible material include, but are not limited to, polypropylene, polyvinyl chloride, polyurethane, polyethylene, nylon, and fluorine resin. For example, the sheath 5 may be made of a very thin and supple metal.

  Referring to FIGS. 3A to 3E, the sheath 5 has a shape suitable for fitting to the needle body 3.

  For example, the sheath 5 may have a hollow cylindrical shape as shown in FIG. 3A, and the wall 21 similar to the cylinder has a slot 23 extending in the longitudinal direction thereof to receive the needle and a cavity 25 surrounded by the wall 21. Then, the needle is received and fitted into the cavity 25. That is, the wall 21 shields the side surface of the needle. The slot 23 may be slightly open as shown, or may be closed before receiving the needle. Such a shape effectively prevents the needle and the sheath from coming into close contact with each other after the sheath 5 and the needle body 3 are fitted, and the needle contained in the cavity 25 from jumping out again.

  Instead of the cylinder, a rectangular parallelepiped shape extending in the longitudinal direction of the sheath 5 may be used. For example, as shown in FIG. 3B, the rectangular wall 27 has a slot 29, and the needle fits into the rectangular cavity 31 inside thereof. Such a shape is advantageous in that twisting hardly occurs. There is a slight clearance between the needle body 3 and the wall 27, but a liquid such as blood or body fluid adhering to the side surface of the needle is held in this clearance. Since such liquids try to stay there due to their own viscosity and surface tension, clearance is more advantageous in preventing liquid leakage.

  Further, as shown in FIG. 3C, the wall 33 may protrude in the direction of narrowing the slot 35. The needle fits into the cavity 37 through the narrowed slot 35. Such a shape effectively prevents the needle contained in the cavity 37 from jumping out again.

  Alternatively, as shown in FIG. 3D, it may protrude only from one edge of the wall 39. The needle fits into the cavity 43 through the narrowed slot 41. Such a shape also effectively prevents the needles that are contained in the cavity 43 from jumping out again.

  Alternatively, as shown in FIG. 3E, the sheath 5 may be composed of a wall 45 extending in the longitudinal direction and a pair of valve-like bodies 47 protruding from both edges in the width direction of the wall toward each other. The needle fits into the cavity 51 through a narrow slot 49 secured between the valve bodies 47. Since the valve-like body 47 is biased in the direction to close the slot 49, it effectively prevents the needle contained in the cavity 51 from jumping out again.

  The shape suitable for fitting to the needle body 3 as described above may be limited to the needle tip 3p and the vicinity thereof. In some cases, the shape of the sheath 5 may be, for example, a strip shape or a wire shape instead of the shape as described above.

  The clearance described above may be secured not only in the sheath shown in FIG. 3B but also in other example sheaths, for example, the cylindrical sheath shown in FIG. 3A. The clearance is preferably secured wider from the viewpoint of accommodating a larger amount of liquid, but is preferably secured narrower from the viewpoint of preventing liquid leakage. Therefore, the clearance can be set to a width of 0.01 to 1 mm, for example.

  At least the inner surface of the sheath 5 may be subjected to hydrophilic treatment by a known technique such as chemical modification and plasma treatment. After use, blood adheres to the needle tip 3p and the side surface, but the hydrophilically treated inner surface is effective for holding such blood between the needle body 3 and the sheath 5. Alternatively, a water repellent treatment may be applied.

  Instead of or in addition to the hydrophilic treatment, the sheath 5 may be provided with water absorption. For example, the sheath 5 may be lined with a water absorbent fiber layer, or the sheath 5 may be made of a water absorbent material. Such a structure is also effective for holding blood.

  In any case, the sheath 5 not only shields the needle tip 3p and the side surface of the needle, but also effectively prevents a liquid such as blood or body fluid from flowing out after shielding.

  The outer surface of the sheath 5 may be subjected to a hydrophobic treatment or a waterproof treatment. Alternatively, the sheath 5 may be manufactured from a hydrophobic or waterproof material.

  The structure of the distal end 5a of the sheath 5 will be described with reference to FIGS. 4A to 4D and FIGS. 5A to 5E.

  As shown in FIGS. 4A and 5A, the sheath 5 may be opened toward the tip 5a. Or as shown to FIG. 4B, the front-end | tip 5a may be provided with the cap body 53 which obstruct | occludes this. The cap body 53 prevents blood from dripping from the needle tip 3p, and effectively prevents the sheath 5 from being detached from the needle tip 3p when the needle tip 3p is caught by the cap body 53. In order to increase these effects, a recess 55 may be provided inside the cap body 53.

  Alternatively, as shown in FIGS. 4C and 5D, the cap body 57 may bulge in a spherical shape. The swelled cap body 57 can give a larger capacity to the internal recess 55 to hold blood or body fluid. Of course, the spherical cap body 59 may be solid as shown in FIG. 4D. As will be described in detail later, the spherical cap body can be used to prevent the slider 11 from falling off by locking the slider 11 or to automatically retract a shutter described later.

  Or as shown to FIG. 5B, the cap body 61 may be open | released toward the front-end | tip 5a, expanding outward. Of course, as shown in FIG. 5C, the tip 5a of the bulged cap body 63 may be closed.

  Further alternatively, as shown in FIG. 5E, the tip 5a may be provided with projections 61 and 63 to engage the slider 11 or the shutter, for example.

  Any of the aforementioned cap bodies can be formed by deforming the tip of the sheath by heating or the like. Alternatively, the cap body may be formed independently of the sheath and bonded to the sheath by means such as heating or ultrasonic bonding. Or you may bulge the front-end | tip of a sheath by making a knot in a sheath. Further, a metal or other material ring may be crimped around the sheath.

  The structure of the slider 11 will be described with reference to FIGS. The slider 11 can be formed of an appropriate resin such as polycarbonate, but is not limited thereto.

  Referring to FIG. 6, according to one embodiment, the slider 11 includes a head portion 11a protruding upward from the main body, a through hole 13 penetrating the head portion 11a, and a through hole 15 penetrating the lower portion of the main body. And a through hole 17 penetrating the side surface of the main body, and a cavity 19 inside the main body and communicating with each through hole.

  The upper through hole 13 has a relatively small diameter and is fitted onto the needle body 3. Since the head portion 11a extends upward, the through hole 13 is also relatively long, and therefore fits on the needle body 3 in a relatively wide range. Since the slider 11 is guided by the through hole 13, it can slide smoothly with respect to the needle body 3 without swinging. Moreover, the head 11a fits with and supports the catheter 7 as understood from FIG. 2A.

  The lower through hole 15 and the side through hole 17 are larger in diameter than the upper through hole 13 and allow passage of the sheath 5. The sheath 5 is separated from the needle body 3 in the vicinity of the lower through-hole 15, and is drawn out of the slider 11 through the through-hole 17 on the side surface.

  As can be understood from FIG. 6, the through-hole 15 and the through-hole 17 are always in contact with the sheath 5 and urged while curving the sheath 5 toward the needle body 3. Therefore, as shown in FIG. 2B, when the slider 11 is moved toward the needle tip, the through hole 15 and the through hole 17 fit the sheath 5 into the needle body 3. That is, the slider 11 is dimensioned to rub against the sheath 5 so as to fit the sheath 5 to the needle body 3 when moving.

  Preferably, the shoulder portion 9a of the handle 9 and the lower portion of the slider 11 are engaged with each other to hold the slider 11 in the initial position shown in FIG. 2A. For example, the shoulder 9 a of the handle 9 may include a protrusion that fits into the through hole 15. Or the circumference | surroundings of the through-hole 15 may be provided with the protrusion extended below, and the shoulder part 9a of the handle | steering-wheel 9 may be provided with the recessed part corresponding to this.

  Referring to FIGS. 7A to 7D, the slider 11 may include a shutter 71 that can be fitted into the slider 11 and retracted in the lateral direction. The shutter 71 may protrude slightly outward from the through-hole on the side surface of the slider 11 as illustrated, or may be entirely retracted inward. The shutter 71 can be formed of an appropriate resin such as polycarbonate, but is not limited thereto. The shutter 71 is, for example, a rectangular box that is open at least below, and has a through hole 73 on a side surface thereof. The sheath 5 contacts the through hole 73 of the shutter 71.

  As understood from FIGS. 7A and 7B, the shutter 71 is initially set at a position not interfering with the needle body 3, and one end thereof may slightly protrude from the side surface of the slider 11. When the slider 11 moves in the direction of the needle tip 3 p and the needle tip 3 p is immersed in the slider 11, the cap body 59 of the sheath 5 is caught in the through hole 73 of the shutter 71. When the slider 11 is further advanced, the hooked body 59 pulls the shutter 71 into the slider 11, and the shutter 71 closes the through hole 13 at the top of the slider 11. The needle tip 3 p is prevented from protruding from the slider 11, and blood does not leak through the through hole 13.

  In order to more effectively prevent blood leakage, the shutter 71 may include a water absorbing member, or the shutter 71 itself may be formed of a water absorbing material.

  The shutter 71 may include a recess 75 that engages with the needle tip 3p so that the shutter 71 does not move again. Further, the slider 11 may be provided with a biasing means such as a spring in order to retract the shutter 71. In this case, since the needle tip 3p is immersed in the through-hole 13 and the urging means pulls the shutter 71, the sheath 5 does not need to have a cap body.

  The shutter 71 may be provided with appropriate engaging means so as to be locked at a specific position with respect to the slider 11. For example, in the example shown in FIGS. 8A and 8B, the shutter 71 includes a flexible lance 73 and a claw 75 protruding outward from the tip thereof. The slider 11 also includes locking claws 77 and 79 on its inner surface.

  The shutter 71 is locked at the initial position by the engagement between the locking claw 77 and the claw 75 close to the side surface. When the shutter 71 is pulled, the lance 73 bends inward, so that the claw 75 gets over the locking claw 79 and the claw 75 and the locking claw 79 are engaged. At this time, since the lance 73 emits a clicking sound and a clicking feeling, the user can confirm that the shutter 71 has reached the retracted position. Due to the engagement between the claw 75 and the locking claw 79, the shutter 71 is held in the retracted position.

  9A and 9B, the slider 11 may include a window 81 for confirming the position of the shutter 71. When the shutter 71 is in the initial position, nothing can be seen through the window 81 as shown in FIG. 9A, but when the shutter 71 is pulled to the correct position, the shutter 71 is confirmed through the window 81 as shown in FIG. 9B. . In order to facilitate confirmation of the shutter 71, the shutter 71 may be colored.

  In the above description, the shutter is shaped to move horizontally, but may be modified to move in an oblique direction. That is, as shown in FIG. 10, the slider 11 may have an inclined cavity 83, and the shutter 85 may have a shape corresponding to this. Since the direction in which the shutter 85 moves more closely matches the direction in which the sheath 5 runs, the movement of the shutter 85 becomes easier.

  The sheath 5 does not necessarily have to be pulled out from the side surface of the slider. Referring to FIG. 11, the through-hole 13 ′ has a relatively large diameter so as to allow passage of the sheath 5, and the sheath 5 is drawn out of the slider 11 through this. Even with such a structure, there is no problem in the operation of fitting the sheath 5 to the needle body 3 by the movement of the slider 11 '.

  Further, the sheath 5 does not necessarily have to be pulled out of the slider. Referring to FIG. 12, the slider 11 may be made relatively large, and the entire sheath 5 may be accommodated in the cavity 19 inside thereof. Even with such a structure, there is no problem in the operation of fitting the sheath 5 to the needle body 3 by the movement of the slider 11.

  13 to 14B, the safety needle 1 may further include a lock member 91 for temporarily locking the catheter 7 with respect to the slider 11. Preferably, as shown in FIG. 14A, the lock member 91 is recessed inside the slider 11, and has a through hole 93 at the end thereof. The locking member 91 extends upward at the opposite end to form a latch 95 that engages the base of the catheter 7.

  Since the latch 95 continues to engage with the catheter 7 even when the slider 11 is at the initial first position or at a position slightly advanced therefrom, the catheter 7 is integrated with the slider 11.

  When the slider 11 is advanced to the second position where the needle tip 3p is shielded, the cap body 59 of the sheath 5 is caught in the through hole 93, and the lock member 91 moves to the left as shown in FIG. 14B. The lock member 91 closes the through hole in the upper part of the slider 11, and the catheter 7 is released from the latch 95 and automatically removed from the safety needle 1.

  As can be understood from the above, since the catheter 7 is locked by the latch 95 before the safety needle 1 is used, the catheter 7 does not drop from the needle body 3 unintentionally. After use, the catheter 7 is integral with the slider 11 and shields the needle tip 3p even when the slider 11 is advanced. When the slider 11 reaches a position where the needle tip 3p is shielded, the catheter 7 is finally released from the latch 95. That is, during this series of operations, either the catheter 7 or the sheath 5 always covers the entire needle body 3. It is prevented that someone touches the needle body 3 unintentionally.

  Further, the sheath does not necessarily have to be a single member. For example, as shown in FIG. 15, sheaths 5L and 5R that fit each other may be employed. For example, as shown in FIG. 16A, the sheath 5L may be configured to be fitted to the sheath 5R so as to wrap the sheath 5R fitted to the needle body 3. Alternatively, as shown in FIG. 16B, the sheath 5L, the needle body 3, and the sheath 5R may be configured to be fitted together. Alternatively, as shown in FIG. 16C, the sheath 5L may be provided with a protrusion 5M for fitting, and the sheath 5R may be provided with a recess 5F for receiving the protrusion 5M so as to be fitted together. Alternatively, an adhesive or the like may be used to fix the sheaths 5L and 5R to each other. In any case, the needle is shielded more effectively because the sheath completely surrounds the needle.

  Alternatively, as shown in FIG. 17, the sheath 101 may be a single member or may be configured to wrap the entire needle body 3. Preferably, both edges in the width direction of the sheath 101 have structures that engage with each other. An example of such a structure is a line fastener (so-called zipper). By moving the slider 103 in the direction of the needle tip, both edges engage with each other, so that the sheath 101 wraps the entire needle body 3. Since the sheath completely surrounds the needle, the needle is more effectively shielded.

  In any of the above-described examples, as shown in FIG. 18, the safety needle 1 may include a cover 105 in order to protect the needle body 3 and the catheter 7. The cover 105 preferably has a notch for pulling out the sheath 5 to the outside, and is configured to hold the sheath 5 to bend the sheath 5 downward. The handle 9 may also have a notch that receives the sheath 5. Not only the needle tip 3p is effectively protected in the stage before being used, but also the sheath 5 is effectively prevented from swinging, which is advantageous in terms of convenience of transportation of the safety needle 1.

  A handle 9 or other member can be used to accommodate the sheath 5. 19A to 19C are examples in which the sheath 5 is accommodated in the handle 9.

  Referring mainly to FIG. 19A showing a state before use, the slider 11 is in a first position in contact with the shoulder portion of the handle 9, and the proximal end 109 of the sheath 5 is not fixed to the handle 9. It is drawn into the storage chamber 111 through the opening 113 provided in the storage room. The proximal end of the storage chamber 111 may be open or closed. When opened, the base end 109 may be exposed to the outside of the storage chamber 111 or may be retracted inside. In any case, most of the sheath 5 is accommodated in the accommodation chamber 111 in a state before use. In the figure, the sheath 5 is substantially straight, but may be curved or spiral.

  The sheath 5 is provided with bulging portions or cap bodies for engagement at both ends 107 and 109 thereof. Or the internal cavity may be obstruct | occluded in the both ends 107 and 109 or both. When the closed cavity is engaged with the needle body 3, the same action as that of the bulging portion or the cap body can be achieved.

  In the vicinity of the through hole at the bottom of the slider 11, the sheath 5 is fitted to the needle body 3, and immediately above the sheath 5 is separated from the needle body 3 and pulled out from the side surface of the slider 11. The distal end 107 of the sheath 5 may be engaged with the through-hole on the side surface of the slider 11 from the beginning when the slider 11 includes a shutter, and the through-hole on the side surface of the shutter.

  Referring to FIG. 19B, when the slider 11 moves toward the needle tip 3 p, the slider 11 rubs against the sheath 5 to fit the sheath 5 to the needle body 3 and pulls the sheath 5 out of the storage chamber 111. . At this time, the opening 113 of the handle 9 presses the sheath 5 toward the needle body 3 so as to maintain the fitting of the sheath 5. Therefore, the sheath 5 is fitted to the needle body 3 in a portion above the opening 113, which is a trace that the slider 11 has passed.

  When the slider 11 moves to the second position shown in FIG. 19C where the needle tip 3p is shielded, the sheath 5 is fitted to almost the entire needle body 3 and shields it. Since the distal end 107 is engaged with the through hole and the proximal end 109 is engaged with the opening 113, the slider 11 is prevented from coming off at this position. Alternatively, the closed base end 109 is hooked on the needle body 3 to prevent the slider 11 from coming off. This prevents the needle tip 3p from being exposed. In the case where the slider 11 includes a shutter, the shutter is driven by the tip 107 and the through hole at the top of the slider 11 is closed.

  According to this embodiment, since the sheath 5 does not protrude sideways, the user can easily operate the safety needle 1.

  Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to the above-described embodiments. Based on the above disclosure, a person having ordinary skill in the art can implement the present invention by modifying or modifying the embodiment.

  A safety needle is provided that can shield not only the tip of the needle but also the side surface.

Claims (9)

A needle body having a needle tip and a side surface;
A flexible sheath that is mateable to the side surface and is dimensioned to shield the needle tip and the side surface;
The first of the needle body so as to be movable along the needle body to pass through the second position disengaged from the needle body and the sheath to shield the needle tip from the position exposing the needle tip and A slider slidably fitted to the sheath and dimensioned to rub against the sheath so as to fit the sheath to the needle body when moving from the first position to the second position; ,
Medical safety needle with   2. The medical safety needle according to claim 1, wherein the slider includes a first through hole and a second through hole configured to rub against the sheath, and the needle body includes the first through hole. It penetrates the through hole and the second through hole.   3. The medical safety needle according to claim 2, wherein the slider includes a third through hole, and the distal end of the sheath is pulled out through the third through hole when the slider is in the first position. It is.   4. A medical safety needle as claimed in any preceding claim, wherein the sheath surrounds a cavity dimensioned to receive the needle body and is configured to shield the side surface. Prepare.   5. The medical safety needle according to claim 4, wherein the wall surface is dimensioned to have a clearance capable of holding a liquid between the wall surface and the side surface.   The medical safety needle according to any one of claims 1 to 5, wherein the sheath includes a cap body for closing the needle tip.   5. The medical safety needle according to claim 4, wherein the sheath is a hollow cylinder or a rectangular parallelepiped so as to surround the cavity. 8. The medical safety needle according to claim 4 or 7 , wherein the wall protrudes in the direction of narrowing the slot of the sheath, in order to prevent the needle body contained in the cavity from jumping out again. A pair of valve-like bodies protruding toward each other are provided. The medical safety needle according to any one of claims 1 to 8 , wherein the sheath includes a cap body on which a tip of the needle is hooked.

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