JP6709545B2 - Lancet - Google Patents

Description

The present invention relates to a lancet and a puncture device used for puncturing the skin to collect a small amount of blood, and more particularly to a disposable lancet and a puncture device that can be repeatedly used by exchanging the lancet. is there.

It may be necessary to self-collect a small amount of blood for medical purposes. For example, a diabetic patient needs to collect his own blood in order to regularly check the blood glucose level (blood glucose self-measurement: SMBG). Conventionally, a puncture device has been used so that such self-collection of blood can be performed safely and reliably.

In such a puncture device, generally, the lancet housed in the housing is biased by a spring member, and the puncture body provided at the tip of the lancet is projected from the housing to perform puncture. Specifically, as described in Japanese Unexamined Patent Application Publication No. 2011-67565 (Patent Document 1), a spring member arranged in the back of the housing is compressed and deformed by inserting and pushing in the lancet from the front end opening of the housing. The puncture needle projects from the housing and is punctured by the biasing force of the spring member by the operation of the patient.

By the way, in Patent Document 1, before attachment to the housing, in order to prevent a needle stick accident, the needle (puncture body) is held in an immovable state so that the needle tip is not exposed to the outside, and A lancet (puncture needle cartridge 105) has been proposed in which the needle can be moved in the distal direction after mounting. That is, as shown in FIGS. 3 to 5 of Patent Document 1, a lancet body (203) is provided with a first arm (209) and a second arm (210), and a member extending between the arms ( 214) is provided, and when mounted in the housing, the second arm (210) is deformed by the base mechanism (102) provided in the housing so that the puncture needle (207) is movable in the distal direction. It is supposed to be done.

However, in the structure of Patent Document 1, the first arm and the second arm sandwich the opening end portion (214) of the puncture needle holder (201) in the puncture direction, so that the lancet body moves forward and backward with respect to the puncture needle holder. It is necessary to provide the first arm and the second arm before and after the puncturing direction because the positioning is performed by. Therefore, during the puncturing operation, the first arm and the second arm are in sliding contact with the inner peripheral surface of the puncture needle holder, so that the frictional resistance increases. As a result, in order to realize the puncture operation against the frictional resistance force, it is necessary to employ a spring member having a larger elasticity, which requires unnecessary force for attaching the lancet and the puncture operation. If the second arm is caught on the inner peripheral surface of the puncture needle holder, normal puncture operation may not be realized.

Further, in Patent Document 1, when the puncture needle cartridge is set in the puncture device body (101), the first arm is pushed toward the inner peripheral side by the base mechanism provided in the puncture device body, and The puncture needle holder is disengaged. However, in such a disengagement mechanism for the first arm, the end face of the cylindrical base mechanism merely abuts the first arm in the puncturing direction and guides it toward the inner peripheral side. There is also a possibility that the disengagement operation of is not stably realized.

JP, 2011-67565, A

The present invention has been made in view of the above circumstances, and a problem to be solved is to prevent the puncture body from being exposed in a single lancet before use and realize an efficient puncture operation of the puncture body. (EN) Provided are a lancet having a novel structure and a puncture device using the same .

Hereinafter, embodiments of the present invention made to solve such problems will be described. The constituent elements used in each of the following aspects can be used in any combination as much as possible.

That is, the present invention is
(1) A lancet including a lancet body having a puncture body and a protector that is axially movable relative to the lancet body, wherein the lancet body is provided with an elastic locking piece. A first locking hole and a second locking hole are provided in the protector side by side in the axial direction so as to be separated from each other, and the elastic locking piece is provided on the inner peripheral side of the first locking hole. The lancet body is held in the initial position by being inserted from the inside and locked, and the locking is released by pushing the elastic locking piece inward through the opening on the outer peripheral side of the first locking hole. On the other hand, the elastic locking piece is reused by being inserted into the second locking hole located in front of the first locking hole in the puncturing direction from the inner peripheral side and locked. The protector is held at the preventive position, and a restricting protrusion protruding toward the inner peripheral side is formed between the first locking hole and the second locking hole in the protector. A lancet, wherein the inner peripheral surface of the restriction projection is inclined so that the protruding height toward the inner peripheral side increases as it goes forward in the puncturing direction,
(2) A lancet including a lancet body including a puncture body and a protector that is movably combined with the lancet body in an axial direction, wherein the lancet body is provided with an elastic locking piece, Further, the hub engaged with the output rod is provided so as to project toward the base end side from the elastic locking piece, while the protector is provided with the first locking hole and the second locking hole in the axial direction. The lancet body is provided at a distant position, and the elastic locking piece is inserted into the first locking hole from the inner peripheral side to be locked, whereby the lancet body is held at the initial position, and The elastic locking piece can be unlocked by pushing the elastic locking piece inward through the opening on the outer peripheral side of the locking hole, while the elastic locking piece is inserted in the puncturing direction more than the first locking hole. A lancet, characterized in that the lancet is retained in the reuse preventing position by being inserted into the second locking hole located in the front from the inner peripheral side and locked.
(3) The lancet according to (1) or (2), wherein the elastic locking piece is inclined outward and extends so as to spread rearward in the puncturing direction.
(4) In the lancet body, the plurality of elastic locking pieces are evenly provided in the circumferential direction, and in the protector, the first locking hole and the second locking hole are provided with the plurality of elastic locking pieces. The lancet according to any one of (1) to (3), which is provided at a position corresponding to each piece.
(5) The puncture body is fixedly provided with a hub engaged with the output rod of the puncture device, and the hub is accommodated in the protector over the entire length at the initial position (1) to (4). ) The lancet according to any one of the items,
(6) An engaging portion protruding outward toward the protector is provided at a tip end portion of the elastic engaging piece, and the engaging portion at the initial position is the first engaging portion of the protector. The engaging portion is adapted to be engaged with the hole, and in the reuse preventing position, the engaging portion is adapted to be engaged with the second engaging hole of the protector (1) to ( The lancet according to any one of 5),
Regarding

According to the present invention, in the lancet before use, the elastic locking piece of the hub fixed to the puncture body is locked in the first locking hole of the protector, so that the hub and the protector are relatively opposed in the puncturing direction. Are positioned, and the puncture body is housed and held in the protector. Therefore, when handling the lancet before use, it is possible to avoid the finger or the like from being damaged by the puncture body.

The perspective view which shows the puncture device as one Embodiment of this invention. The top view of the puncture device shown in FIG. The front view of the puncture device shown in FIG. Sectional drawing which shows the internal structure of the puncture device shown in FIG. The top view of the puncture apparatus main body which comprises the puncture device shown in FIG. The front view of the puncture device main body shown in FIG. VII-VII sectional drawing of FIG. The disassembled perspective view of the puncture device main body shown in FIG. The perspective view of the lancet which comprises the puncture device shown in FIG. Sectional drawing which shows the internal structure of the lancet shown in FIG. The disassembled perspective view of the lancet shown in FIG. The top view of the lancet shown in FIG. The front view of the lancet shown in FIG. XIV-XIV sectional drawing of FIG. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a state before the lancet is attached to the puncture device body. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a process of mounting a lancet on the puncture device body. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a puncture standby state in which a lancet is attached to the puncture device body. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a state in which a cap is removed from the hub. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a moment of puncturing. FIG. 3 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a state in which a puncture needle is housed in a protector after puncturing. FIG. 6 is a vertical cross-sectional view illustrating a method of using the puncture device shown in FIG. 1, showing a process of removing a used lancet from the puncture device body. The longitudinal cross-sectional view which expands and shows the principal part in the state which attached the used lancet to the puncture device main body.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a puncture device 10 as one embodiment of the present invention. The puncture device 10 has a structure in which the lancet 14 is detachably attached to the puncture device body 12. In the following description, unless otherwise specified, the axial direction refers to the left-right direction in FIG. 2, which is the central axial direction of the puncture device body 12 and the lancet 14, and the protruding direction of the puncture needle 114 (puncturing direction) described later. 2) is referred to as the front and the right is referred to as the rear.

More specifically, the lancing device body 12 shown in FIGS. 5 to 8 includes a housing 16, and the housing 16 includes a housing body 18 and a protector holder 20. The housing body 18 is a substantially cylindrical member made of a hard resin molded product, and an operation window 22 is opened in the peripheral wall. As shown in FIG. 8, the housing main body 18 of the present embodiment is formed by combining a pair of substantially symmetrical halves and fixing the halves to each other by means of ultrasonic welding or the like. Is formed by.

As shown in FIG. 7, the protector holder 20 is a substantially cylindrical component made of a resin molded product, and an opening locking portion 24 projecting to the outer periphery is integrally formed at the front end. Further, on the inner peripheral surface of the protector holder 20, four guide grooves 26 that continuously extend in the axial direction are formed and are evenly arranged on the circumference.

Further, on the peripheral wall portion of the protector holder 20, four flexible pieces 28 are formed at equal intervals on the circumference. The flexible piece 28 has a substantially rectangular plate shape, and one side of the front side is integrally connected to the peripheral wall of the protector holder 20, and the other three sides are independent from the peripheral wall of the protector holder 20 by cutting. .. As a result, the rear end of the flexible piece 28 is allowed to move to the outer peripheral side with deformation, and the flexible piece 28 is allowed to bend and deform to the outer peripheral side.

Furthermore, the flexible protrusions 28 of the protector holder 20 are provided with engaging protrusions 30, respectively. The engagement protrusion 30 is a protrusion that protrudes toward the inner circumference of the protector holder 20, and has a substantially constant semicircular cross section and extends in the circumferential direction of the protector holder 20 with a predetermined width. The engaging projection 30 is integrally formed at the rear end of the flexible piece 28, and the protruding tip of the engaging projection 30 moves in the radial direction of the protector holder 20 due to the bending deformation of the flexible piece 28. It is possible.

The protector holder 20 is housed in the front opening of the housing body 18. That is, the pair of support protrusions 32, 32 projectingly provided on the outer peripheral surface of the protector holder 20 are inserted into the support recesses 34, 34 formed on the inner peripheral surface of the housing body 18, and the opening holder of the protector holder 20 is opened. The protector holder 20 is positioned and held in the opening portion of the housing body 18 by overlapping the stopper portion 24 with the front end face of the opening of the housing body 18. In this way, the protector holder 20 is attached to the opening portion of the housing body 18 to form the housing 16 of the present embodiment.

Further, when the protector holder 20 is attached to the housing body 18, the rear end portion of the flexible piece 28 including the engaging protrusion 30 is provided with respect to the escape recess 36 that opens to the inner peripheral surface of the housing body 18. , Respectively, and the deformation of the flexible piece 28 to the outer peripheral side is allowed.

The housing 16 also houses an output rod 38 as an output member. The output rod 38 has a substantially cylindrical shape as a whole, and has a bifurcated shape in which a front portion is vertically divided by a slit 40 (upper and lower in FIG. 7). Further, a first lock protrusion 42 and a second lock protrusion 44 are formed on the front portion of the bifurcated output rod 38. Each of the first and second lock protrusions 42, 44 has a substantially right-angled triangular cross section, and the front surface extends in a direction substantially perpendicular to the axis, and the rear surface extends rearward while inclining inward. , Are arranged at a predetermined distance from each other in the axial direction. In the present embodiment, the pair of first and second lock protrusions 42, 44 of the output rod 38 are formed so as to project vertically, and when the output rod 38 is housed in the housing 16, the output rod 38 is Although it is not necessary to specify the vertical direction of 38, the assembling work is facilitated, but the lower first and second locking protrusions 42 and 44 may be omitted, for example.

Further, a pair of connecting protrusions 46, 46 is provided at the front end of the output rod 38. The connecting protrusions 46, 46 project vertically inward at the front end of the output rod 38 having a bifurcated shape, and have a curved shape in which the front end portion inclines upward and downward toward the front.

Furthermore, a rod contact portion 48 is provided behind the connecting convex portion 46 of the output rod 38. In the front end portion of the output rod 38 having a bifurcated shape, the rod contact portion 48 is formed with a pair of vertically opposed protrusions, and the rear surface thereof is a convex curved surface that gradually inclines forward toward the protruding tip. Has been done.

On the other hand, a large diameter expanded contact portion 50 is provided at the rear end of the output rod 38, and an annular step is formed at the front end of the expanded diameter contact portion 50.

A push rod 52 is inserted through the output rod 38. The push rod 52 has a small-diameter, solid, and substantially cylindrical shape, and a pair of push-out portions 54, 54 protruding forward from both sides in the width direction (vertical direction in FIG. 5) are provided at the tip end portion. Has been. The push rod 52 is inserted into the output rod 38 and protrudes rearward of the output rod 38, and the pair of push-out portions 54, 54 protrudes laterally through the slit 40 of the output rod 38.

Further, a puncture spring 56 as a spring member is externally inserted on the push rod 52. The puncture spring 56 is a coil spring, which is externally inserted into the rear end portion of the push rod 52 which projects rearward from the output rod 38 and whose front end is inserted into the expanded diameter contact portion 50 of the output rod 38. Thus, it is in axial contact with the output rod 38.

Further, a discharge switch 58 is attached to the rear end of the push rod 52. The discharge switch 58 has a substantially bottomed cylindrical shape, and the rear end of the push rod 52 is inserted into and fixed to the discharge switch 58. Further, the rear end of the puncture spring 56 is inserted into the discharge switch 58 and is in axial contact therewith, and the puncture spring 56 is sandwiched between the output rod 38 and the discharge switch 58 in the axial direction.

Further, the discharge switch 58 is inserted through the setting dial 60. The setting dial 60 has a substantially tubular shape as a whole, and the discharge switch 58 is inserted through the rear end opening and the front portion is inserted into the housing body 18. Further, a large-diameter engagement portion 62 projecting to the outer circumference is provided at the insertion portion of the setting dial 60 into the housing body 18 over the entire circumference. The large-diameter engagement portion 62 is inserted into the engagement groove 64 opening in the inner peripheral surface of the housing body 18 and locked in the axial direction, whereby the setting dial 60 is axially moved relative to the housing body 18. Is positioned and supported in a state where relative rotation is allowed. The ejection switch 58 is movable forward and backward with respect to the setting dial 60, and is prevented from slipping backward in the axial direction.

Further, a spacer 66 is externally inserted in the intermediate portion of the output rod 38. The spacer 66 has a substantially cylindrical shape, and a flange-shaped spring contact portion 74 is provided at the front end portion so as to project to the outer periphery.

A pressing spring 80 is arranged behind the spacer 66. The pressure spring 80 is a coil spring having a diameter larger than that of the puncture spring 56, and is externally inserted at the rear end of the output rod 38 and the rear portion of the spacer 66, and the spring contact portion 74 of the spacer 66 and the discharge switch. It is arranged in a pre-compressed state axially with respect to 58. As a result, the spacer 66 is urged forward by the pressing spring 80 and pressed against the projecting piece 82 projecting on the inner peripheral surface of the housing main body 18 in the axial direction, so that the spacer 66 is axially moved with respect to the housing main body 18. It is positioned.

A recovery spring 86 is arranged in the housing body 18. The recovery spring 86 is a coil spring and is externally inserted between the first lock protrusion 42 and the second lock protrusion 44 of the output rod 38 in the axial direction, and is formed on the inner circumference of the housing body 18. Is disposed in the accommodated storage portion 88. The accommodating portion 88 is provided with a peripheral wall portion capable of positioning the recovery spring 86 in the axis-perpendicular direction, and front and rear support wall portions 90a, 90b having insertion holes 92 through which the output rod 38 can be inserted on both axial sides. Is equipped with. The insertion hole 92a formed through the front support wall 90a is formed so that the first and second lock protrusions 42 and 44 cannot pass therethrough, while the insertion hole formed through the rear support wall 90b is formed. The second lock projection 44 can pass through the hole 92b.

Further, a ring member 94 is arranged between the rear support wall 90 and the rear end of the recovery spring 86. The ring member 94 has a substantially annular plate shape and is externally inserted between the first lock protrusion 42 and the second lock protrusion 44 of the output rod 38 in the axial direction. The center hole of the ring member 94 has a cross-sectional shape in which the first and second lock protrusions 42 and 44 cannot be inserted so that the second lock protrusion 44 is locked. Since the output rod 38 is bifurcated at the portion where the second lock protrusions 42 and 44 are formed, the output rod 38 can be inserted into the ring member 94 by bending the output rod 38 so as to approach vertically. ..

An operation member 96 is attached to the operation window 22 formed in the housing main body 18 in front of the accommodation portion 88. The operation member 96 includes an operation button 98 exposed to the outside from the operation window 22, and a positioning piece 100 which is integrally formed with the operation button 98 and extends forward and backward. The operation member 96 also includes a plate-shaped lock piece 102. The lock piece 102 extends downward from the front portion of the operation button 98, has an intermediate portion that is an inclined portion 104 that gradually inclines rearward, and both front and rear end portions spread in a substantially axial direction. There is. Further, at the rear end portion of the inclined portion 104, a contact recess 106 that opens to the lower surface at the center portion in the width direction is formed. The abutting recess 106 has a front surface of the bottom surface that extends substantially in the axial direction and a rear surface of the bottom surface that is a guide surface that gradually inclines rearward, so that the first lock protrusion 42 can be inserted. Has been done.

In the operation member 96, the positioning piece 100 is inserted from the operation window 22 and overlapped with the inner peripheral surface of the housing body 18, and the front portion of the lock piece 102 is attached by the support shaft 108 attached to the housing body 18. Is supported from below. The support shaft 108 has a small-diameter columnar shape, and has both axial end portions supported by the housing body 18 and extends in the width direction. The lock piece 102 of the operating member 96 is superposed on the support shaft 108 from above, and the front end of the inclined portion 104 is supported by the support shaft 108. As a result, when the operation button 98 is pressed, the lock piece 102 tilts about the support shaft 108, and the rear end of the lock piece 102 is displaced upward with respect to the output rod 38. There is. Further, the rear end of the lock piece 102 is located between the first lock protrusion 42 and the second lock protrusion 44 in the single body of the lancing device main body 12 to which the lancet 14 is not attached, and thus the first lock. The protrusion 42 is inserted into the contact recess 106.

On the other hand, the lancet 14 is configured by combining a lancet body 110 and a protector 112, as shown in FIGS. 9 to 14. As shown in FIG. 14, the lancet body 110 has a structure in which a puncture needle 114 as a puncture body is substantially entirely covered by a hub 116 and a cap 118 which are integrally formed of resin.

The hub 116 is fixed to the proximal end portion of the puncture needle 114 and protrudes rearward of the puncture needle 114. Furthermore, an annular connecting groove 120 that opens to the outer peripheral surface is formed at the rear end of the hub 116.

Further, the hub 116 is provided with a pair of elastic locking pieces 122, 122. The elastic locking piece 122 is in the shape of a long plate as a whole, extends vertically from the vicinity of the front end of the hub 116, and curves and projects rearward. Further, the elastic locking piece 122 is gradually inclined rearward and upward and outward, and in the present embodiment, the front end portion serving as the base end is curved in a substantially arcuate shape in the thickness direction, and is The rear end portion is formed into an inclined flat plate shape. In this embodiment, since the pair of elastic locking pieces 122, 122 are provided above and below the hub 116, the elastic locking pieces 122, 122 are evenly arranged on the circumference of the hub 116.

Furthermore, at the rear end of the elastic locking piece 122, an engaging portion 124 projecting outward in the vertical direction is integrally formed. The engaging portion 124 has a front surface that extends in a direction substantially perpendicular to the axis, and a rear surface that is an inclined surface that inclines rearward toward the upper and lower sides.

The cap 118 covers the distal end portion of the puncture needle 114 and is integrally formed with the hub 116 via the weakened portion 125. The fragile portion 125 is made thin by an annular groove opening to the outer peripheral surface, and when an external force is applied when removing the cap 118, stress concentrates and breaks preferentially. Further, a large-diameter disk-shaped closing portion 126 is provided at the tip of the cap 118, and a pair of substantially semi-circular plates is formed into a cross shape in the axial direction at the tip of the closing portion 126. A grip portion 128 having a combined shape is formed integrally. Further, an arrow 130 as a marking portion extending in the circumferential direction is integrally formed on the grip portion 128. The arrows 130 are respectively formed between the four plate portions constituting the grip portion 128 in the circumferential direction, and indicate that the cap 118 may be rotated in either of the circumferential directions when the cap 118 is removed, which will be described later. Therefore, arrows 130a and arrows 130b, which are opposite to each other, are alternately arranged on the circumference.

Further, a fitting convex portion 132 protruding rearward is formed on the closing portion 126 of the cap 118. The fitting convex portion 132 has a substantially columnar shape, and has a rear end surface as a first inclined surface 134 that is inclined with respect to the axis-perpendicular direction. The first inclined surface 134 is formed of a flat surface that is inclined substantially uniformly, and the rear end portion of the cap 118 having a small diameter projects rearward from the central portion of the first inclined surface 134. There is.

The protector 112 is externally attached to the lancet body 110 having such a structure. The protector 112 has a substantially cylindrical shape as a whole, and four notches 136 extending in the axial direction are formed at equal intervals on the circumference, whereby the rear end portion is divided into four. In addition, a positioning protrusion 138 protruding to the outer peripheral side is continuously provided over the entire circumference at an axially intermediate portion of the protector 112. Further, behind the positioning protrusion 138 of the protector 112, guide protrusions 140 projecting toward the outer peripheral side and extending in the axial direction are formed at four locations on the circumference.

A pair of first locking holes 142 and second locking holes 144 are formed behind the positioning protrusions 138 of the protector 112. The first locking hole 142 and the second locking hole 144 are rectangular holes that have substantially the same shape and open to the peripheral wall of the protector 112, and are arranged at a predetermined distance in the axial direction to form the second locking hole. Locking hole 144 is located in front of the first locking hole 142. Further, the pair of first locking holes 142, 142 and the pair of second locking holes 144, 144 are formed at positions facing each other in the radial direction, and are mounted on the protector 112 of the lancet body 110 described later. In this state, the first and second locking holes 142 and 144 are arranged on the circumference at positions corresponding to the elastic locking pieces 122. In addition, the inner surface of the second locking hole 144 is formed of an inclined surface in which the rearward portion gradually inclines forward toward the inner peripheral side. In the present embodiment, the first locking hole 142 and the second locking hole 144 are formed between the circumferentially adjacent guide protrusions 140 in the circumferential direction.

Further, between the first locking hole 142 and the second locking hole 144, a restriction protrusion 146 protruding toward the inner peripheral side is formed between the axial directions. The restriction protrusion 146 is a protrusion whose projection height gradually increases toward the front, and both the front surface and the inner peripheral surface gradually incline toward the inner peripheral side toward the front. Further, the front surface of the restriction protrusion 146 is continuous with the rear inner surface of the second locking hole 144, and in the present embodiment, these surfaces are configured by a single inclined flat surface. The protruding height of the restriction protrusion 146 is set in consideration of the elasticity of the elastic locking piece 122, the moving speed of the lancet body 110 at the time of puncture, the axial dimension of the second locking hole 144, and the like. It is desirable that the engaging portion 124, which has passed over the restriction protrusion 146, can be moved forward without entering the second locking hole 144 during the puncturing operation described later.

Further, the protector 112 is formed with a fitting window 148 having a shape corresponding to the first locking hole 142. The fitting window 148 is formed on substantially the same circumference as the first locking hole 142 and at a position outside the first locking hole 142, and the pair of first locking holes 142, 142 are opposed to each other. The pair is arranged so as to face in one radial direction that is substantially orthogonal to the direction.

In addition, a fitting recessed member 150 is provided at the front end of the protector 112. The fitting recessed member 150 has a recessed shape that opens toward the front, and its bottom surface is a second inclined surface 152 that corresponds to the first inclined surface 134 of the cap 118. Further, a hole through which the cap 118 is inserted is formed through the bottom wall of the fitting recessed member 150. The fitting recessed material 150 is fixed to the front end portion of the protector 112 by means such as welding or adhesion, and substantially constitutes a part of the protector 112.

Then, the lancet body 110 is inserted into the protector 112, the fitting convex portion 132 of the cap 118 is fitted into the fitting concave member 150 of the protector 112, and the engaging portion 124 of the elastic locking piece 122 is inserted. , The first locking hole 142 is inserted and locked. As a result, the lancet body 110 including the puncture needle 114 is positioned and held at the initial position behind the protector 112 in the puncture direction to form the lancet 14.

In the state where the lancet body 110 and the protector 112 are positioned and held at the initial positions, the puncture needle 114 and the hub 116 of the lancet body 110 are housed inside the protector 112 over substantially the entire length. Preferably, in the lancet body 110, at least the tip of the puncture needle 114 is always accommodated in the inner circumference of the protector 112, and the coupling groove 120 of the hub 116 is always accommodated in the inner circumference of the protector 112. The puncture needle 114 and the hub 116 are always accommodated in the protector 112 over substantially the entire length.

The lancet 14 having such a structure is attached to the puncture device body 12 when the puncture device 10 is used. That is, as shown in FIG. 15, the lancet 14 is brought closer to the puncture device body 12 from the front, and the lancet 14 is inserted into the front end opening of the puncture device body 12. When the lancet 14 is inserted into the distal end opening of the puncture device body 12, the bifurcated front end of the output rod 38 is pushed open by the rear end of the hub 116 as shown in FIG. The connecting convex portion 46 provided at the front end is inserted into the connecting concave groove 120 of the hub 116 and engaged in the axial direction. As a result, the lancet body 110 and the output rod 38 are coupled so as to move integrally in the axial direction.

Further, by further pushing the lancet 14 rearward, the output rod 38 moves rearward and the puncture spring 56 is axially compressed, as shown in FIG. Further, since the first lock protrusion 42 moves while pushing up the lock piece 102 and is positioned rearward of the lock piece 102, the front end of the first lock protrusion 42 with respect to the rear end of the lock piece 102. Are locked in the axial direction. As a result, the forward movement of the output rod 38 is restricted by the lock piece 102, and the puncture spring 56 is held in a compressed state. As a result, in the mounted state of the lancet 14 shown in FIG. 17, the output rod 38 and the lancet body 110 connected thereto are held at the puncture preparation position where the elastic force of the puncture spring 56 exerts a forward biasing force. ..

Further, the protector 112 of the lancet 14 pushes the flexible piece 28 to the outer peripheral side as shown in FIG. 16 when the rear end portion of the protector 112 comes into contact with the engaging convex portion 30 provided on the protector holder 20 of the housing 16. It is inserted into the protector holder 20 while unfolding. Then, when the lancet 14 is further pushed to move the engagement protrusion 30 to the opening portion of the first locking hole 142, the elasticity of the flexible piece 28 causes the engagement protrusion 30 to move as shown in FIG. 30 enters the first locking hole 142 and is locked in the axial direction. In addition, the engaging projection 30 is inserted into the fitting window 148 and locked in the axial direction. By these, the protector 112 is axially positioned with respect to the protector holder 20, and is attached to the housing 16.

Furthermore, by inserting the engaging projection 30 into the first locking hole 142, the engaging portion 124 of the elastic locking piece 122 is pushed toward the inner peripheral side by the engaging projection 30 to engage. The engagement between the portion 124 and the first engagement hole 142 is released. As a result, the positioning of the lancet body 110 and the protector 112 is released, and the lancet body 110 is allowed to be displaced relative to the protector 112 in the axial direction. As is clear from this, the release protrusion of the present embodiment is formed by the two engagement protrusions 30 and 30 inserted into the first locking holes 142 and 142. In addition, if the front surface of the engaging portion 124 is formed as an inclined surface that is inclined rearward toward the upper and lower sides, the engaging portion 124 can be smoothly removed from the first locking hole 142. The term “unlocked” as used herein means that the operation button 98 is pressed to be ready for puncturing, and the engaging portion 124 of the elastic engaging piece 122 is completely removed from the first engaging hole 142. Not only in the state where the engaging portion 124 and the first engaging hole 142 are released, the engagement between the engaging portion 124 and the first engaging hole 142 is weakened from the initial state, in other words, the engaging area is reduced. It also includes a state in which the engaging portion 124 is easily disengaged from the first locking hole 142.

In the present embodiment, the guide protrusion 140 provided on the outer peripheral surface of the protector 112 is inserted into the guide groove 26 opening on the inner peripheral surface of the protector holder 20, so that the lancet 14 is moved relative to the housing 16. , Is axially inserted while being positioned in the circumferential direction.

In this manner, puncturing with the puncture needle 114 of the lancet 14 is performed with the lancet 14 attached to the puncture device body 12. Hereinafter, the puncture operation of the puncture device 10 will be described with reference to FIGS. 18 to 21.

First, as shown in FIG. 18, in the puncture device 10 in which the lancet 14 is attached to the puncture device body 12, the cap 118 of the lancet body 110 is removed from the hub 116 to expose the tip of the puncture needle 114. As a result, the lancet body 110 is held in the puncture preparation position while being urged forward by the puncture spring 56 to be in the puncture standby state.

The method of removing the cap 118 from the hub 116 is not particularly limited, and the fragile portion 125 may be torn off by applying a tensile force in the axial direction. However, in the present embodiment, the grip portion 128 is grasped to surround the cap 118. When it is rotated in the axial direction, an axial component force is generated by the guiding action of the first inclined surface 134 and the second inclined surface 152, and the component force is applied to the fragile portion 125 in the axial direction. By exerting it as a tensile force, the fragile portion 125 is broken and the cap 118 is removed. The puncture needle 114 is housed on the inner peripheral side of the protector 112 with the cap 118 removed, and prevents the user from accidentally touching the tip of the puncture needle 114.

Next, by pressing the operation button 98 of the operation member 96 while applying the tip of the lancet 14 (protector 112) to the skin of the puncture part of the patient, the rear end of the lock piece 102 is displaced so as to be separated from the output rod 38. Then, the lock between the rear end of the lock piece 102 and the first lock protrusion 42 is released. As a result, as shown in FIG. 19, the output rod 38 is displaced forward based on the biasing force of the puncture spring 56, the puncture needle 114 projects forward from the tip opening of the protector 112, and the skin of the patient is instantaneously exposed. Is punctured by.

Further, when the output rod 38 moves forward, the ring member 94 is pressed forward by the second locking protrusion 44 of the output rod 38, and when the ring member 94 moves forward, the recovery spring 86 is compressed in the axial direction. It As a result, a rearward biasing force based on the elasticity of the recovery spring 86 is exerted on the output rod 38 during puncturing.

Then, when the puncture is completed, as shown in FIG. 20, the output rod 38 is displaced rearward by the urging force of the recovery spring 86, and the puncture needle 114 is quickly accommodated in the inner circumference of the protector 112.

There, the lancet body 110 after completion of the puncture is held at the reuse prevention position in front of the initial position without returning to the initial position before the puncture. That is, when the output rod 38 and the lancet body 110 are moved rearward from the puncture position by the backward biasing force of the recovery spring 86, as shown in FIG. 20, the elastic locking pieces 122 of the lancet body 110 are engaged. The joint portion 124 enters and is locked in the second locking hole 144 without returning to the first locking hole 142. As a result, the lancet body 110 is positioned and held in the axial direction with respect to the protector 112 in a state in which it is positioned forward compared to before the puncturing operation. In the present embodiment, the restriction protrusion 146 is formed between the first locking hole 142 and the second locking hole 144, and the engaging portion 124 abuts on the front surface of the restriction protrusion 146. The first locking hole 142 is not returned to the second locking hole 144.

In such a reuse prevention position, when the used lancet is mounted on the housing 16, the lancet body 110 is located in front of before the puncture, so that the engaging projection 30 of the housing 16 has the elastic locking piece 122. The engaging portion 124 does not abut. Therefore, the lancet body 110 is still strongly held by the protector 112, and even if the lancet body 110 is pressed from the base end side, the lancet body 110 does not move in the distal direction. Further, in the present embodiment, the lancet body 110 and the output rod 38 connected to the lancet body 110 are located in front of before the puncture, so that the first lock protrusion 42 is located in front of the rear end of the lock piece 102. positioned. In short, the output rod 38 is at substantially the same position as the single state of the puncture device body 12 before the lancet 14 is attached, and the urging force of the puncture spring 56 does not act on the output rod 38. Therefore, the puncture operation does not occur even if the operation button 98 is pressed again after the puncture.

Next, as shown in FIG. 21, the discharge switch 58 is pushed forward to move the push rod 52 forward relative to the output rod 38. As a result, the front end of the push rod 52 is inserted between the rod abutting portions 48, 48 of the output rod 38, and the front end portion of the output rod 38 is deformed so as to be vertically separated, so that the connecting convex portion 46 and the hub. The fitting of the connecting groove 120 of 116 is released.

Further, by pushing the push rod 52 forward, the push-out portion 54 is inserted into the notch 136 of the protector 112 and abuts the rear end of the protector 112 at the portion where the notch 136 is formed. As a result, a forward force is exerted on the protector 112 to release the engagement between the engagement protrusion 30 and the first engagement hole 142 and the fitting window 148, and the protector 112 is moved relative to the protector holder 20. Is pushed relatively forward. As a result, the used lancet 14' is discharged from the lancing device body 12 and discarded. If the lancet 14 ′ is not ejected from the lancing device body 12 and is caught while the protector 112 and the protector holder 20 are unlocked, the protector 112 can be grasped and withdrawn with fingers or the like. Also in this case, since the tip of the puncture needle 114 is housed in the protector 112, there is no risk of the puncture needle 114 injuring a finger or the like.

Here, in the puncture device 10 of the present embodiment, the reuse of the used lancet 14' is prevented. That is, in the used lancet 14 ′, as shown in part A of FIG. 22, the engaging portion 124 of the elastic locking piece 122 is inserted into the second locking hole 144, and the lancet body 110 is used. It is located forward of the protector 112 as compared to the front. As a result, even if the used lancet 14 ′ is inserted from the distal end opening of the lancing device main body 12 and pushed backward, the engaging protrusion 124 of the housing 16 does not come into contact with the engaging portion 124 of the elastic locking piece 122, Does not enter the puncture standby state. Further, as shown in part B of FIG. 22, the output rod 38 cannot be moved backward to lock the front surface of the first lock projection 42 and the rear surface of the lock piece 102, and the puncture spring 56 is in a compressed state. Can no longer hold. Therefore, the output rod 38 cannot be displaced forward by the elastic restoring force of the puncture spring 56, and the puncture operation as described above cannot be established. If the used lancet 14' is mistakenly attached to the puncture device body 12, the used lancet 14' can be removed from the puncture device body 12 by pressing the ejection switch 58.

As described above, according to the puncture device 10 of the present embodiment, the relative position between the lancet body 110 and the protector 112 is changed before and after the puncture, and the used lancet 14′ is attached to the puncture device. It is impossible to set and re-puncture the body 12. Therefore, by preventing re-puncture, problems such as infectious diseases can be avoided and hygienic use can be realized.

In addition, the elastic locking pieces 122, which come into sliding contact with the inner peripheral surface of the protector 112 during puncturing, are provided in a pair only in the upper and lower directions, and the frictional resistance due to the sliding contact of the elastic locking pieces 122 is reduced, so that the puncturing is performed. The efficiency of operation is improved. Further, since the pair of elastic locking pieces 122, 122 are provided symmetrically in the vertical direction, sliding contact of the elastic locking piece 122 with the protector 112 suppresses blurring of the hub 116 and the puncture needle 114. The pain at the time of puncture can be reduced. In addition, by arranging the pair of elastic locking pieces 122, 122 evenly on the circumference, a well-balanced sliding contact with the protector 112 is realized, and the number of elastic locking pieces 122 formed is minimized. Therefore, the material for forming the hub 116 including the elastic locking piece 122 can be reduced.

Moreover, the elastic locking piece 122 extends rearward while inclining outward, and when the puncturing operation is performed, the elastic locking piece 122 slides on the inner peripheral surface of the protector 112 and a frictional resistance force acts. However, the elastic locking piece 122 is not deformed so as to open outward in the vertical direction. Therefore, further increase of the frictional resistance force due to the deformation of the elastic locking piece 122 is avoided.

Due to these, in the puncture device 10 of the present embodiment, the mechanism for preventing the reuse of the used lancet 14′ is realized with a structure in which the influence on the puncture operation is minimized, and an efficient puncture operation and The improvement of safety by prevention of reuse is achieved at the same time.

Further, the protector 112 is sufficiently long so that the puncture needle 114 and the hub 116 are accommodated in the protector 112 over substantially the entire length in the lancet 14 before use. Therefore, the hub 116 and the puncture needle 114 fixed thereto are protected by the protector 112, and the hub 116 and the puncture needle 114 are prevented from being damaged.

Moreover, in the used lancet 14 ′ with the cap 118 removed, the lancet body 110 is accommodated in the inner circumference of the protector 112 over the entire length, so that the lancet body 110 can be operated from the outside to protect the protector 112. Displacement is extremely difficult. Therefore, by any chance, in the used lancet 14′, the elastic locking piece 122 is pushed inward to release the locking with the second locking hole 144, and the lancet body 110 with respect to the protector 112 before being used. Even if it is forcibly moved to the position, such work is very troublesome, so that the reuse of the used lancet 14' is more effectively prevented.

Further, the housing 16 of the puncture device 10 is configured by assembling the protector holder 20 as a separate body to the housing body 18. As a result, the protector holder 20 can freely set the shape and elasticity required for switching between the holding and releasing of the protector 112 and the protector holder 20. It is possible to set the required weather resistance, erosion resistance, etc. in consideration of the fact that it is handled in.

Further, the engagement between the engagement portion 124 of the elastic engagement piece 122 and the first engagement hole 142 is such that when the lancet 14 is attached to the lancing device body 12, the engagement protrusion 30 of the protector holder 20 has the first engagement protrusion 30. By being inserted into the locking hole 142, it is released with high reliability. Further, the engaging projection 30 of the protector holder 20 is supported by the flexible piece 28, and when the protector 112 is inserted, the flexible piece 28 is deformed to the outer peripheral side so that the engaging projection 30 escapes to the outer circumference. Then, the protector 112 is inserted to a predetermined position without being caught by the engaging convex portion 30. In this embodiment, the escape recess 36 provided in the housing body 18 is located on the outer peripheral side of the flexible piece 28, and the deformation of the flexible piece 28 on the outer peripheral side abuts on the housing body 18. It is allowed by the relief recess 36 without being limited by.

In addition, since the restricting protrusion 146 protruding to the inner peripheral side is formed between the first locking hole 142 and the second locking hole 144 in the protector 112, the hub 116 is used as the recovery spring after the puncture. When the vehicle is moved backward by the elastic force of 86, the rear end of the elastic locking piece 122 comes into contact with the restriction projection 146. As a result, the engaging portion 124 of the elastic locking piece 122 surely enters the second locking hole 144, and the hub 116 is positioned and held at the reuse prevention position. Moreover, since the front surface of the restriction protrusion 146 is an inclined surface that gradually inclines forward toward the inner circumference, when the rear end of the elastic locking piece 122 contacts the restriction protrusion 146, the engaging portion 124 Are positively guided to the second locking hole 144. In the present embodiment, the rear end surface of the elastic locking piece 122 that abuts the front surface of the restriction protrusion 146 is also an inclined surface corresponding to the front surface of the restriction protrusion 146, so that the guiding action is more effectively exhibited. It is like this.

Further, during the puncturing operation in which the hub 116 moves forward with respect to the protector 112, the elastic locking piece 122 is pushed inward by the engaging portion 124 overcoming the restriction protrusion 146. As a result, the engaging portion 124 of the elastic locking piece 122 does not enter the second locking hole 144 that is disposed in front of and adjacent to the restriction protrusion 146, and reaches the front of the second locking hole 144. Since it can be reliably moved, the reliability of the puncture operation can be improved. In addition, since the inner peripheral surface of the restriction protrusion 146 is inclined such that the protruding height toward the inner peripheral side increases as it goes forward, the engaging portion 124 is caught by the inner peripheral surface of the restriction protrusion 146. Without fail, the stability of operation is ensured.

Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the specific descriptions. For example, in the above-described embodiment, an example in which the pair of elastic locking pieces 122 and 122 are provided and the pair of first and second locking holes 142 and 144 is provided has been described. For example, three or more 122 may be provided on the circumference. In that case, the first and second locking holes 142 and 144 are formed by the number corresponding to the elastic locking pieces 122.

Further, the elastic locking pieces 122 are preferably arranged evenly on the circumference, but are not limited thereto, and may be provided unevenly on the circumference or only on a part thereof.

The first locking hole 142 can also be formed in a slit shape or the like opened at the rear end of the protector 112.

Further, in the embodiment, the relative positional relationship (initial position) between the hub 116 and the protector 112 in the lancet 14 before being set in the puncture device main body 12 and the hub in the lancet 14 in the puncture standby state set in the puncture device main body 12. The relative positional relationship between 116 and the protector 112 (puncturing preparation position) is the same as each other. For example, by setting the lancet 14 on the lancing device main body 12, the hub 116 is moved relative to the protector 112. Alternatively, it may be held after being relatively displaced to the puncture preparation position.

The present invention originally includes the inventions described below, and a supplementary note will be given regarding the configuration and operational effects thereof.
The present invention is
(I) In a puncture device in which a lancet housed in a housing is urged by a spring member to cause a puncture body provided at the tip of the lancet to protrude from the housing and perform a puncture operation, the lancet is fixed to the puncture body. And a protector externally fitted to the hub. The hub is provided with an elastic locking piece extending to the outer peripheral side, and the elastic is provided in the first locking hole opened in the peripheral wall of the protector. The hub is held at an initial position rearward in the puncturing direction by locking the end of the locking piece, and a release projection is provided on the inner peripheral surface of the housing so as to project. Is inserted from the front end opening of the housing, the release projection is inserted into the first locking hole, the locking of the elastic locking piece with the first locking hole is released, and the hub is punctured. A puncture device characterized by being set to a puncture standby state held in the preparation position, (ii) The hub is held at a reuse prevention position different from that before use with respect to the protector after puncturing operation. The puncture device according to (i),
(Iii) A second locking hole is formed on the peripheral wall of the protector, the second locking hole opening at a position apart from the first locking hole forward in the puncturing direction. The puncture device according to (ii), wherein an end portion is locked in the second locking hole so that the hub is held at a reuse prevention position in front of the puncturing direction.
(Iv) Between the first locking hole and the second locking hole of the protector, there is provided a restriction protrusion whose projection height gradually increases toward the inner peripheral side as it goes forward in the puncturing direction. The puncture device according to (iii), which is inclined toward the rear in the puncture direction and extends outward.
(V) The plurality of elastic locking pieces are evenly provided on the circumference of the hub, and the plurality of first locking holes correspond to the elastic locking pieces on the circumference of the protector. A puncture device according to any one of (i) to (iv),
(Vi) The puncture device according to any one of (i) to (v), wherein the hub is housed in the protector over the entire length.
(Vii) An engaging portion projecting outward toward the protector is provided at an end of the elastic engaging piece, and the engaging portion is engaged with the first engaging hole of the protector. The puncture device according to any one of (i) to (vi),
(Viii) The housing has a structure in which a tubular protector holder is housed in a hollow housing body, and the release protrusion is provided on the inner peripheral surface of the protector holder so as to project (i) to (vii). The puncture device according to any one of the above items,
(Ix) Any one of (i) to (viii) in which a flexible piece that is allowed to be flexibly deformed to the outer periphery is provided on the peripheral wall of the housing, and the release projection is projected on the flexible piece. A puncture device according to item 1;
(X) An output member connected to the hub is housed in the housing, and an operation member exposed on the outer surface of the housing is provided, and the output member is housed by housing the lancet in the housing. And the operating member are locked to each other so that the lancet connected to the output member is held at the puncture preparation position, and the operating member is operated to release the locking to the output member. The puncture device according to any one of (i) to (ix), in which the puncture body connected to the output member is projectingly displaced by the spring member to perform a puncture operation.
Including inventions.
In the invention described in (i) above, in the lancet alone, the elastic locking piece is locked in the first locking hole, so that the puncture body and the hub are positioned immovably with respect to the protector. The puncture body is not exposed to the outside of the protector, and it is possible to avoid accidentally injuring a finger or the like with the puncture body. Moreover, in order to position the puncture body and the hub and the protector immovably, it is not always necessary to provide a plurality of elastic locking pieces in the puncturing direction, and the number of elastic locking pieces reduces frictional resistance during the puncturing operation, It is also possible to realize a smooth puncture operation. Further, when the lancet is mounted on the housing, the release protrusion provided on the inner peripheral surface of the housing is inserted into the first locking hole of the protector to lock the elastic locking piece and the first locking hole. Is to be released. As a result, simply by mounting the lancet on the housing, the puncture waiting state in which the relative displacement of the puncture body with respect to the protector is allowed can be performed without requiring a special operation, and blood collection can be performed easily. it can. Moreover, since the release projection protruding to the inner peripheral side of the housing is inserted into the first locking hole, the elastic locking piece and the first locking hole can be unlocked with high reliability. .. In addition, the release projection is inserted into the first locking hole to prevent the protector from being detached from the housing.
In the invention described in (ii) above, the hub is held at different positions with respect to the protector before and after puncture use. As a result, even if the lancet after the puncture use is attached to the housing for reuse, the elastic locking piece is held in the state of being locked by the protector, so that the puncture operation does not occur. Therefore, the reuse of the used lancet is mechanically prevented, and infections and the like can be prevented.
In the invention described in (iii) above, after the puncturing operation, the elastic locking piece is locked in the second locking hole of the protector, and the puncture body and the hub are positioned in the front-rear direction with respect to the protector. It is possible to prevent the puncture body from being exposed to the outside from the protector.
In the invention described in (iv) above, when the puncturing operation is performed, the elastic locking piece is elastically locked by passing over the opening of the second locking hole while being pushed inward by the restriction protrusion. The target puncturing operation is reliably realized without the piece getting caught in the second locking hole. On the other hand, when the puncture body and the hub are retracted rearward after the puncture is completed, the rear end of the elastic locking piece comes into contact with the regulation projection, so that the elastic locking piece enters the second locking hole and is locked. .. As a result, it is possible to surely prevent reuse while realizing the desired puncturing operation. In addition, since the elastic locking piece extends rearward in the puncturing direction while inclining outward, even if the elastic locking piece moves while slidingly contacting the inner peripheral surface of the protector during the puncturing operation, the elastic locking piece is elastically locked. The piece is unlikely to get caught on the inner peripheral surface of the protector, which realizes smooth operation. Moreover, the frictional resistance between the elastic locking piece and the protector does not act to open the elastic locking piece to the outside, and an increase in frictional resistance is avoided.
In the invention described in (v) above, when the puncturing operation is performed, the plurality of elastic locking pieces evenly slidably contact the inner peripheral surface of the protector on the circumference, thereby preventing the hub from tilting with respect to the protector. A stable puncture operation is realized, and pain at the time of puncture due to blurring of the puncture body is reduced. Moreover, since the elastic locking pieces are locked at the plural positions on the circumference with respect to the first locking hole, the puncture body and the hub are stably positioned and held with respect to the protector, and With high reliability, accidents such as needle sticks can be prevented.
In the invention described in (vi) above, the puncture body and the hub are protected by the protector, so that durability and reliability are improved. Moreover, in the used lancet, the hub is housed in the protector over substantially the entire length, so even if the hub is forcibly returned to the pre-use position with respect to the protector and the hub is reused, It is difficult to operate, and it takes a lot of time to restore it to a reusable state. Therefore, the reuse of the lancet is more effectively avoided, and the safety is ensured.
In the invention described in (vii) above, the elastic locking piece is stably engaged with the first locking hole because the engaging portion is formed to project at the rear end of the elastic locking piece. Since the lancet is held in the stopped state, the hub and the protector can be stably positioned and held in the lancet alone.
In the invention described in (viii) above, since the lancet is housed in the protector holder that is separate from the housing, the support structure for the lancet, the release projection, and the like can be provided in the protector holder with a high degree of freedom, and The material and shape of the housing can be freely set without being limited by the support structure of the lancet or the like.
In the invention described in the above (ix), when the lancet is inserted into the housing and accommodated therein, it is possible to prevent the release projection from escaping to the outer circumference by the flexible piece bending to the outer circumference, and preventing the release projection from being caught by the protector. it can. Moreover, when the release projection reaches the opening position of the first locking hole, the release projection is inserted into the first locking hole based on the elasticity of the flexible piece, and the elastic locking piece and the first locking hole are inserted. The holes are unlocked.
In the invention described in (x) above, the housing for reusing the means for holding the elastic force of the spring member by locking and the means for releasing the locking and allowing the puncturing operation by the elastic force of the spring member are reused. The structure of the disposable lancet can be simplified by providing the lancet. As a result, the lancet can be easily manufactured and the cost can be reduced.

Reference numeral 10: puncture device, 12: puncture device main body, 14: lancet, 16: housing, 18: housing main body, 20: protector holder, 28: flexible piece, 30: engaging convex portion (release protrusion), 38: output rod (Output member), 96: operation member, 112: protector, 114: puncture needle (puncture body) , 116: hub, 122: elastic locking piece, 124: engaging portion, 142: first locking piece, 144 : Second locking piece, 146: Restricting protrusion

Claims (6)

A lancet including a lancet body including a puncture body, and a protector that is movably combined with the lancet body in the axial direction,
An elastic locking piece is provided on the lancet body, while a first locking hole and a second locking hole are provided on the protector side by side in the axial direction and apart from each other,
The elastic locking piece is inserted into the first locking hole from the inner peripheral side and locked, whereby the lancet body is held at the initial position and the opening of the first locking hole on the outer peripheral side is held. The locking can be released by pushing the elastic locking piece inward through
The elastic locking piece is inserted into the second locking hole, which is located forward of the first locking hole in the puncturing direction, from the inner peripheral side to be locked, so that the elastic locking piece is held at the reuse prevention position. has become,
Between the first locking hole and the second locking hole in the protector, there is formed a restricting protrusion protruding toward the inner peripheral side, and the inner peripheral surface of the restricting protrusion is forward in the puncturing direction. The lancet is inclined so that the protruding height toward the inner peripheral side increases as it goes to . A lancet including a lancet body including a puncture body, and a protector that is movably combined with the lancet body in the axial direction,
An elastic locking piece is provided on the lancet body , and a hub engaged with the output rod is provided so as to project toward the base end side from the elastic locking piece , while the protector has a first The locking hole and the second locking hole are provided at positions separated from each other in the axial direction,
The elastic locking piece is inserted into the first locking hole from the inner peripheral side and locked, whereby the lancet body is held at the initial position and the opening of the first locking hole on the outer peripheral side is held. The locking can be released by pushing the elastic locking piece inward through
The elastic locking piece is inserted into the second locking hole, which is located forward of the first locking hole in the puncturing direction, from the inner peripheral side to be locked, so that the elastic locking piece is held at the reuse prevention position. A lancet characterized by being. The lancet according to claim 1 or 2 , wherein the elastic locking piece is inclined outward and extends so as to spread rearward in the puncturing direction. In the lancet body, a plurality of the elastic locking pieces are evenly provided in the circumferential direction, and in the protector, the first locking hole and the second locking hole are respectively provided with the plurality of elastic locking pieces. the lancet according to any one of claim 1 to 3 are provided at the corresponding positions. Has a hub which is engaged said puncture body is fixed to the output rod of the puncture device, any one of the claims 1-4 in which the hub is accommodated in the protector over the entire length in the initial position Lancet described in paragraph. An engaging portion protruding outward toward the protector is provided at a tip portion of the elastic engaging piece, and the engaging portion engages with the first engaging hole of the protector at the initial position. together are adapted to be locked, in the reuse preventing position, claim 1, the engagement portion is adapted to be engaged with the second locking hole of the protector The lancet according to item 1.

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