JP7419809B2 - Puncture device - Google Patents

Description

The present disclosure relates to a puncturing device, and particularly to a disposable puncturing device for blood collection.

Blood may be collected by puncturing the skin surface and exuding a small amount of blood. A disposable puncture device may be used for such blood collection. In a disposable puncture device, a lancet having a puncture needle at its tip is biased by a spring and housed in a housing. By releasing the biasing force, the tip of the lancet protrudes from the housing and pierces the skin surface, causing blood to ooze from the skin.

Various mechanisms have been considered for holding the lancet so that the biasing force can be released during use. For example, there is a mechanism in which a lancet is provided with a movable part such as an arm, and the movable part is releasably locked to a part of the housing (for example, see Cited Document 1). However, in such a mechanism, when releasing the movable part, a lateral force is applied to the lancet, which may cause the axis of the lancet to deviate from the axial direction or deform when released, resulting in undesired results. There is a problem that the needle moves in an uneven trajectory and shakes during puncturing.

As a configuration that does not require applying a lateral external force to the lancet, there is a configuration in which a rotatable locking ring is provided within the housing. In this case, the locking ring receives the energized lancet, and by rotating the locking ring, the lancet and the locking ring are disengaged, and the lancet passes through the locking ring and the tip side (see, for example, Patent Document 2). With such a mechanism, when releasing the biasing force, no lateral force is applied to the lancet, so that the needle is less likely to shake during puncturing.

Japanese Patent Application Publication No. 2011-56076 Japanese Patent Application Publication No. 2012-5518

However, it has been newly confirmed that puncture blur may still occur in a mechanism having a locking ring. That is, there is a demand for miniaturization of disposable lancing devices, but if the locking ring is made smaller, the shaft of the lancet hub that passes through the locking ring must be made thinner. On the other hand, disposable lancing devices are manufactured with a spring biasing force applied to the lancet so that they can be used immediately. It was confirmed that the product was deformed and bent. If the shaft of the lancet hub is bent, the puncture needle swings during puncturing, which tends to cause puncturing blur.

An object of the present disclosure is to make it possible to realize a puncturing device that is unlikely to cause puncturing blur.

One aspect of the puncture device of the present disclosure includes a lancet having a puncture needle and a lancet hub that holds the puncture needle so as to protrude from the tip, a housing that accommodates the lancet, and a lancet attached in a direction in which the puncture needle protrudes from the housing. The housing includes a locking ring through which the lancet hub is inserted, and a puncture depth setting section provided on the distal side of the locking ring, and the lancet hub is provided on the distal side. It has a depth determining protrusion that collides with the puncturing depth setting part to determine the puncturing depth.

According to one aspect of the puncturing device, the depth determining protrusion provided on the distal end side of the lancet hub collides with the puncturing depth setting part to determine the puncturing depth. The movement of the puncture needle during puncture when the shaft of the lancet hub is bent and deformed is due to the relative position of the part that collides with the puncture depth setting part and the puncture needle. The further away the part is from the puncture needle, the larger the range of movement of the puncture needle swings, and the more the puncture needle wobbles. Therefore, by providing the depth determining protrusion on the distal end of the lancet hub, the occurrence of puncturing blur can be suppressed compared to when the depth determining protrusion is provided on the proximal end. .

In one embodiment of the puncturing device, the depth determining protrusion can be provided at a position where it can pass through the locking ring during the puncturing operation. By doing so, the user can easily press the puncture button while keeping the puncturing area and the button in view. Further, it is possible to reduce the situation where the depth determining protrusion impairs the visibility of the puncture portion after puncturing.

In one aspect of the puncture device, the housing includes a transparent skin-contacting cylinder part that is provided on the distal side of the puncture depth setting part and has a transparent interior that allows the interior to be visually checked, The thickness setting portion can be made thinner than the portion provided with the setting portion. With such a configuration, it is possible to prevent the puncture depth setting section from obstructing visibility when visually confirming blood oozing.

In one embodiment of the puncture device, the length from the tip of the skin-contacting tube to the puncture depth setting section can be made larger than the diameter of the tip of the skin-contacting tube. With such a configuration, blood seepage due to puncturing can be visually observed more reliably.

One aspect of the puncturing device further includes a puncturing button that performs a puncturing operation when pressed, and the direction in which the puncturing depth setting section projects may be parallel to the direction in which the button is pressed. Since users tend to press the button with their thumbs, the puncture site is rarely checked from a viewpoint parallel to the direction in which the button is pressed. Therefore, it is possible to reduce the possibility that the puncture depth setting section obstructs visibility.

According to the puncturing device of the present disclosure, puncturing blur can be made less likely to occur.

It is a front view showing the puncture device of this embodiment in an unused state. It is a side view showing the puncture device of this embodiment in an unused state. It is an exploded perspective view showing the puncture device of this embodiment in an unused state. 2 is a sectional view taken along the line IV-IV in FIG. 1. FIG. 3 is a sectional view taken along line VV in FIG. 2. FIG. FIG. 3 is a plan view of the cap body viewed from the proximal end side. It is a side view of a cap body. FIG. 3 is a partially cutaway perspective view of the cap body. 8 is a sectional view taken along line IX-IX in FIG. 7. FIG. It is a perspective view showing a locking ring. FIG. 2 is a cross-sectional view taken along line IV-IV in FIG. 1 in a puncture preparation state. FIG. 3 is a cross-sectional view taken along line VV in FIG. 2 in a puncture preparation state. FIG. 7 is a plan view of the locking ring viewed from the proximal end in a puncturing preparation state. FIG. 2 is a sectional view taken along line IV-IV in FIG. 1 in a puncturing state. FIG. 3 is a cross-sectional view taken along line VV in FIG. 2 in a puncturing state. FIG. 7 is a plan view of the locking ring seen from the proximal end side in the puncturing state. FIG. 2 is a cross-sectional view taken along line IV-IV in FIG. 1 after puncturing. FIG. 3 is a cross-sectional view taken along line VV in FIG. 2 after puncturing. FIG. 3 is an enlarged sectional view showing the distal end portion of the present embodiment in a puncturing state.

As shown in FIGS. 1 to 5, the puncture device of this embodiment includes a lancet 101, a housing 102 that accommodates the lancet 101, and a compression coil spring 103 that is a biasing member that biases the lancet 101. There is. In the following description, the side brought into contact with the skin will be referred to as the distal end, and the opposite side will be referred to as the proximal end.

The lancet 101 includes a lancet hub 111 and a puncture needle 112 attached to the lancet hub 111 so that its sharp tip protrudes. In the unused state shown in FIGS. 1 to 5, the tip of the puncture needle 112 is covered with a needle cover 113.

The lancet hub 111 is rod-shaped, and a spring seat 151 for fixing the compression coil spring 103 is formed at the base end of the lancet hub 111 . A pair of proximal protrusions 152 are integrally formed on the outer peripheral surface of the proximal end of the lancet hub 111 and protrude on both sides in a direction perpendicular to the central axis of the lancet hub 111 . A pair of distal protrusions 153 are integrally formed on the outer peripheral surface of the distal end of the lancet hub 111 and protrude on both sides in a direction perpendicular to the central axis of the lancet hub 111 . Further, a pair of depth determining protrusions 154 that protrude on both sides in a direction perpendicular to the central axis of the lancet hub 111 are integrally formed on the proximal end side of the distal end protrusion 153 by a predetermined distance. The depth determining protrusion 154 is provided on the distal end side compared to the axial center of the lancet hub 111. Furthermore, the puncture needle 112 extends toward the proximal end of the portion where the depth determining protrusion 154 is located within the lancet hub, thereby improving the strength of the lancet hub.

The protruding direction of the tip side protrusion 153 and the protruding direction of the depth determining protrusion 154 are different from each other. In this embodiment, the protruding direction of the tip-side protrusion 153 and the protruding direction of the depth determining protrusion 154 are shifted from each other by 90 degrees around the central axis. In this embodiment, the protrusion direction of the distal protrusion 153 and the protrusion direction of the proximal protrusion 152 are the same around the central axis; The protrusion direction of the end side protrusion 152 does not need to be the same as the protrusion direction.

The needle cover 113 has a rod shape whose central axis coincides with the lancet hub 111, and is integrally formed at the tip of the lancet hub 111. The boundary between the lancet hub 111 and the needle cover 113 is a constricted threaded portion 155 with a reduced outer diameter, and by twisting the needle cover 113 around the central axis relative to the lancet hub 111, the threaded portion 155 is formed. The needle cover 113 can be manually removed from the lancet hub 111 by threading the lancet hub 111 . By removing the needle cover 113 from the lancet hub 111, the tip of the puncture needle 112 that was covered by the needle cover 113 can be exposed.

The tip portion of the needle cover 113 is a flat gripping portion 156, and the proximal end of the gripping portion 156 is formed with a protrusion 157 and a tongue-shaped elastic claw 158 protruding from both sides in the width direction. .

The lancet 101 is housed in the housing 102 with its central axis aligned with the central axis of the housing 102. The housing 102 includes a housing body 121 and a cap body 122 attached to the distal end side of the housing body 121.

The housing main body 121 has a substantially cylindrical shape with a base end closed by a top plate portion and an open tip, and the tip has a slightly larger diameter than the base end. The top plate portion of the housing body 121 is provided with a spring seat 126 that protrudes from the center of the inner surface toward the tip side. Further, a pair of body-side guide grooves 130 extending in the axial direction are provided in the inner wall of the housing body 121. The body side guide groove 130 has a circumferential width and a radial depth set so as to be able to guide the proximal protrusion 152 provided on the lancet hub 111 in the axial direction. By fitting and sliding the proximal protrusion 152 into the main body guide groove 130, the lancet hub 111 can be moved smoothly in the axial direction, and the lancet hub 111 can be prevented from rotating around the axis.

An operating piece 124, which is a puncturing button, is formed near the tip of the housing body 121. The operating piece 124 is disposed within a through window 134 formed in the peripheral wall of the housing body 121 and is partially connected to the peripheral wall of the housing body 121. By pressing the operation piece 124 with a finger, the connecting portion is elastically deformed, and the operation piece 124 is displaced toward the inside of the housing body 121.

A connecting rib 136 for connecting the cap body 122 is integrally formed at the tip of the housing body 121. As shown in FIGS. 6 to 9, a connecting ring 138 that receives a connecting rib 136 is integrally formed at the base end of the cap body 122. The connecting ring 138 is connected and supported to the cap body 122 by a connecting portion 141 that projects from the outer peripheral surface of the cap body 122 . In this embodiment, four connecting ribs 136 and four connecting parts 141 are provided, and by aligning the connecting parts 141 between the connecting ribs 136, the connecting ribs 136 are engaged with the connecting ring 138. let Thereby, the housing body 121 and the cap body 122 are positioned and fixed in the axial direction, and the cap body 122 is positioned and fixed so as not to rotate relative to the housing body 121.

The cap body 122 has a support cylinder portion 142 that protrudes further toward the proximal end than the connection ring 138 . The support cylinder portion 142 is provided with a notch groove 144 that receives a pair of distal protrusions 153 provided on the lancet hub 111. A cap-side guide groove 146 for receiving a pair of depth determining protrusions 154 provided on the lancet hub 111 is provided at a position offset from the notch groove 144 in the support cylinder portion 142. The cap side guide groove 146 extends from the distal end of the cap body 122 to a position a predetermined distance away from the proximal end side.

The positional relationship between the notch groove 144 and the cap side guide groove 146 matches the positional relationship between the distal end side protrusion 153 provided on the lancet hub 111 and the depth determining protrusion 154. Further, the notch groove 144 has a circumferential width dimension and a radial depth dimension so as to receive a protrusion 157 provided on the needle cover 113 and a distal end protrusion 153 provided on the lancet hub 111. The cap side guide groove 146 has a circumferential width dimension and a radial depth dimension so as to receive the depth determining protrusion 154 provided on the lancet hub 111 .

A cover locking protrusion 147 that engages with a protrusion 157 and an elastic claw 158 provided on the needle cover 113 is provided at a position where the notch groove 144 is extended at the tip of the cap body 122. A puncture depth setting part 163 with which the depth determining protrusion 154 collides is provided at the tip of the cap side guide groove 146. The puncture depth setting portion 163 is a protrusion that protrudes perpendicularly to the central axis of the housing 102, and the distal end surface of the depth determining protrusion 154 collides with the proximal end surface. In this embodiment, a guide wall is provided around the puncture depth setting part 163 to guide the depth determination protrusion 154 to ensure that the depth determination protrusion 154 collides with the puncture depth setting part 163. ing. By providing the puncture depth setting part 163 at the tip of the cap-side guide groove 146 that guides the depth determining protrusion 154, the depth determining protrusion 154 can reliably collide with the puncturing depth setting part 163. can guide you. On the other hand, the base end of the cap-side guide groove 146 is tapered and formed to have a large width, so that the depth determining protrusion 154 can be easily introduced into the cap-side guide groove 146. The puncture depth setting portion 163 protrudes inward to a greater extent than the cover locking protrusion so that the depth determining protrusion 154 does not pass through in the event of a collision. However, the cap-side guide groove 146 may be provided as needed, and may not be provided. Further, the puncture depth setting portion 163 does not need to protrude inward to a large extent compared to the cover locking protrusion.

A compression coil spring 103 and a locking ring 172, which are biasing members, are housed in the housing 102. The compression coil spring 103 is fitted and fixed between a spring seat 126 provided on the top plate portion of the housing body 121 and a spring seat 151 of the lancet hub 111. At the position where the lancet hub 111 is displaced toward the proximal end, the compression coil spring 103 is compressed and deformed, and a biasing force accompanying the compression deformation is applied in a direction to push the lancet hub 111 from the housing 102 toward the distal end.

As shown in FIG. 10, the locking ring 172 has a substantially circular ring shape with a through hole in the center through which the lancet hub 111 is inserted, and is rotatably attached to the support cylinder portion 142 of the cap body 122. ing. The locking ring 172 has a thick inner flange-shaped engagement portion 175 provided on the proximal end side, and a pair of abutting leg portions 174 protruding toward the distal end side. In this embodiment, the contact leg portion 174 is inserted between the four connecting portions 141 provided around the support cylinder portion 142. When the locking ring 172 is rotated, the contact leg portion 174 abuts against the connecting portion 141 in the circumferential direction, so that the rotational range of the locking ring 172 in the circumferential direction on the support cylinder portion 142 is limited. becomes smaller than 45°.

A pair of first passage grooves 176 and a pair of second passage grooves 178 are formed on the inner circumferential surface of the inner flange-shaped engaging portion 175, facing each other in the radial direction. The first passage groove 176 and the second passage groove 178 each extend linearly over the entire length of the engaging portion 175 in the axial direction.

The inner diameter of the engaging portion 175 is slightly larger than the outer diameter of the lancet hub 111 and the needle cover 113, and the locking ring 172 is fitted onto the lancet hub 111 and the needle cover 113. The first passage groove 176 of the engaging portion 175 has a slightly larger cross-sectional shape than the distal protrusion 153 of the lancet hub 111, and the distal protrusion 153 is movable in the first passage groove 176 in the axial direction. It is. On the other hand, the second passage groove 178 of the engaging portion 175 has a slightly larger cross-sectional shape than the depth determining protrusion 154 of the lancet hub 111. is movable in the axial direction.

The angle (intersection angle) between the straight line connecting the pair of first passage grooves 176 and the straight line connecting the pair of second passage grooves 178 in the locking ring 172 is the angle between the pair of tip side protrusions in the lancet hub 111. The angle (intersection angle) between the protruding direction of the portion 153 and the protruding direction of the pair of depth determining protrusions 154 is different. Specifically, the angle between the straight line connecting the pair of first passage grooves 176 and the straight line connecting the pair of second passage grooves 178 is approximately 60°, and the protrusion direction of the distal end protrusion 153 is approximately 60°. The angle between this and the protruding direction of the pair of depth determining protrusions 154 is 90°. Therefore, when the lancet hub 111 inserted through the locking ring 172 has the distal end protrusion 153 and the first passage groove 176 aligned, the depth determining protrusion 154 is aligned with the second passage groove 178. Can't pass. On the other hand, when the depth determining protrusion 154 and the second passage groove 178 are aligned, the tip end side protrusion 153 cannot pass through the first passage groove 176.

The distance between the proximal end surface of the distal end protrusion 153 and the distal end surface of the depth determining protrusion 154 on the lancet hub 111 is slightly larger than the thickness of the engaging portion 175 . Therefore, the distal protrusion 153 passes through the first passage groove 176 and is located on the distal side of the engaging part 175, and the depth determining protrusion 154 is located on the proximal side of the engaging part 175. It can be done. In this state, the locking ring 172 fitted onto the lancet hub 111 can be rotated relative to the lancet hub 111.

A pair of pressing pieces 180 are integrally formed on the outer peripheral surface of the locking ring 172 so as to protrude from both sides in the radial direction. This pressing piece 180 has a scalene right triangle shape when the locking ring 172 is viewed in the axial direction, and the surface corresponding to the hypotenuse becomes a pressing slope surface 182 that is inclined around the central axis of the locking ring 172. . The pair of pressing pieces 180 are aligned so that they are located inside the operating piece 124 of the housing body 121 in a state where the locking ring 172 is attached to the support cylinder part 142. By pushing the operation piece 124 into the housing 102 with a finger, one circumferential end of the operation piece 124 is pressed against the pressing inclined surface 182 and pressed. The pressing force of the operating piece 124 rotates the locking ring 172 based on the component force exerted according to the inclination angle of the pressing slope 182.

In the unused state with the needle cover 113 attached as shown in FIGS. 4 and 5, the cover locking protrusion 147 of the cap body 122 is sandwiched between the protrusion 157 formed on the needle cover 113 and the elastic claw 158. It is locked. In this state, the lancet 101 compresses and deforms the compression coil spring 103, which is a biasing member, until the depth determining protrusion 154 of the lancet hub 111 reaches the base end side of the housing body 121 where it does not come into contact with the locking ring 172. Being pushed. Therefore, the biasing force of the compression coil spring 103 is received by the engagement between the protrusion 157 and elastic claw 158 of the needle cover 113 and the cover locking protrusion 147 of the cap body 122.

In the unused state, the first passage groove 176 of the locking ring 172 is aligned with the notch groove 144 of the support tube 142, and the distal end protrusion 153 of the lancet hub 111 is aligned with the notch groove 144 of the support tube 142. It is located astride between the first passage groove 176 of the support cylinder 142 and the notch groove 144 of the support cylinder part 142. Therefore, even if the operating piece 124 is operated, the locking ring 172 does not rotate relative to the lancet hub 111.

When using an unused puncture device 100 with a needle cover 113 attached, first grasp the housing 102 with one hand, pinch the needle cover 113 with the other hand, and rotate the needle cover 113. As a result, the protrusion 157 and elastic claw 158 of the needle cover 113 are separated from the cover locking protrusion 147 of the cap body 122. Further, the needle cover 113 is separated from the lancet hub 111 by being threaded at the threaded portion 155, and the needle cover 113 is removed from the cap body 122.

When the needle cover 113 is removed, the lancet hub 111 is moved toward the distal end by the biasing force of the compression coil spring 103. As a result, the depth determining protrusion 154 of the lancet hub 111 comes into a puncturing preparation state, as shown in FIGS. In this embodiment, in the puncture preparation state, the biasing force of the compression coil spring 103 is received by the contact between the depth determining protrusion 154 and the engaging portion 175 of the locking ring 172. In the puncture preparation state, the distal protrusion 153 passes through the first passage groove 176 and is located on the distal side, and the locking ring 172 is in a rotatable state.

When the locking ring 172 is rotated by pushing the operation piece 124 of the puncture device 100 in the puncture preparation state with a finger, the position of the second passage groove 178 of the locking ring 172 is changed as shown in FIGS. 14 to 16. This coincides with the position of the depth determining protrusion 154 of the lancet hub 111 that was in contact with the proximal end surface of the locking ring 172. Due to the biasing force of the compression coil spring 103, the depth determining protrusion 154 passes through the second passage groove 178 and moves toward the distal end until it collides with the puncture depth setting part 163. Thereby, the tip of the puncture needle 112 protrudes from the tip opening of the cap body 122 by a predetermined length, and puncturing is performed. The cover locking protrusion 147 provided on the distal side of the puncture depth setting part 163 of the cap body 122 is designed to have a size that does not prevent the distal protrusion 153 of the lancet hub 111 from passing through. Furthermore, the proximal protrusion 152 of the lancet hub 111 is designed so as not to come into contact with the proximal end of the locking ring 172 even at the puncturing position, and the proximal protrusion 152 is also provided in the main body guide groove 130. There are no protrusions or the like that collide with each other.

The compression coil spring 103 whose biasing force is released stretches beyond its free length and then returns to its free length. Both ends of the compression coil spring 103 in the axial direction are fixed to the spring seat 126 of the housing body 121 and the spring seat 151 of the lancet hub 111, respectively, so that the lancet 101 after puncturing is caused by the restoring force of the compression coil spring 16. It is pulled back to the proximal end side and enters the used state shown in FIGS. 17 and 18. In the used state, lancet 101 is held in a position determined by the free length of compression coil spring 103.

A puncturing device is required to achieve a predetermined puncturing depth and to minimize the damage caused to the skin during puncturing. Inserting the puncture needle vertically into the skin and removing it vertically can minimize the damage caused to the skin. However, blurring occurs during puncturing, so the angle of the puncturing needle changes when it enters the skin and when it is withdrawn, making the wound larger and causing more pain. In order to minimize wobbling during puncturing, it is possible to minimize the clearance between each part, but if you take into account that the lancet hub will bend and deform over time, a certain amount of clearance will be required. .

If the protrusion for setting the puncture depth is provided on the proximal end of the lancet hub, there is no need to consider interference with the locking ring, but if the shaft of the lancet hub is bent, the protrusion for setting the puncture depth The swinging angle when the needle collides with the puncture depth setting section increases, resulting in blurring during puncture and increased pain.

In the puncturing device of this embodiment, the depth determining protrusion 154 that passes through the locking ring 172 and moves toward the distal end collides with a puncturing depth setting section 163 provided in the housing. Since the depth determining protrusion 154 is located on the distal end side of the lancet hub 111 that passes through the locking ring 172 during puncturing, it is less susceptible to bending deformation due to the biasing force of the compression coil spring 103, and is therefore less susceptible to deformation during puncturing. blur is less likely to occur.

Further, since the depth determining protrusion 154 is located on the distal end side of the lancet hub, when the axis of the lancet hub is bent, the distal end surface of the depth determining protrusion 154 is It is less likely to tilt significantly compared to when it is on the proximal end of the hub. Therefore, when the distal end surface of the depth determining protrusion 154 collides with the puncture depth setting section 163, it is possible to reduce the wobbling until the surfaces come into contact. In addition, in the puncture preparation state, by being in contact with the proximal end surface of the locking ring 172, it can also serve as regulating the axial position of the puncture needle in the puncture preparation state, and the influence of interference with the locking ring 172 can be taken into account. Can be minimized By providing a protrusion for setting the puncture depth at the most distal end of the lancet hub 111, the influence of deflection of the lancet hub 111 can be minimized. However, in this case, a collision part on the side of the cap body 122 that collides with the protrusion for setting the puncture depth must be provided near the tip of the cap body. If the collision part is provided near the tip of the cap, the visibility of the punctured part from the outside will be reduced. After the puncture, the user presses the tip of the cap body against the skin until blood leaks from the puncture site, but if visibility is reduced, it becomes difficult to determine whether blood has oozed out or not, which is not preferable. However, in this embodiment, the depth determining protrusion 154 is provided closer to the proximal end than the distal protrusion 153 so that it passes through the locking ring 172 during puncturing. Therefore, the puncture depth setting section 163 can be provided at a position away from the distal end of the cap body 122 by a predetermined distance toward the proximal end, and the visibility of the puncture portion from the outside can be improved.

Note that, as shown in FIG. 19, by providing a thin skin-contacting cylinder portion 164 at the tip of the cap body 122, visibility can be further improved. The wall thickness t of the skin contact cylinder portion 164 is thinner than at least the maximum thickness of the portion of the cap body 122 where the puncture depth setting portion 163 protrudes inward, and is thinner than the maximum thickness of the portion of the cap body 122 where the puncture depth setting portion 163 protrudes inward. It is also preferable that the thickness of the proximal depth determining protrusion 154 is thinner than that of the portion through which the proximal depth determining protrusion 154 passes. Furthermore, if the inner diameter φ of the skin contacting cylinder part 164 is made larger than the depth determining protrusion 154, a sufficient space can be provided around the blood that oozes out after the puncture, and the ooze blood can be transferred to the cap body. 122 can be made less likely to occur. Furthermore, since a guide groove is not provided in the skin-contacting cylindrical portion 164, if the skin-contacting cylindrical portion 164 is made of a highly transparent material, it will be easier to see the inside and prevent blood from seeping out. It becomes possible to check the condition visually. Note that only the skin-contacting cylinder portion 164 can be made transparent, or the entire cap body 122 can be made transparent.

From the viewpoint of more reliably visualizing the blood seeping out due to the puncture, the length L from the tip of the skin-contacting cylinder part 164 to the puncture depth setting part 163 is equal to the inner diameter φ of the tip of the skin-contacting cylinder part 164. It is preferable that it is larger than . Further, by making the inner diameter φ of the tip of the skin contacting cylinder part larger than the maximum width of the depth determining protrusion 154, blood adhesion to the skin contacting cylinder part can be suppressed. Further, when the cap-side guide groove 146 is provided, it is preferable to provide the puncture depth setting portion 163 at the tip of the cap-side guide groove 146. In this way, the positions of the cap-side guide groove 146 and the puncture depth setting portion 163, which obstruct visibility, are concentrated and visibility can be prevented from being obstructed.

During the puncturing operation, the operating piece 124 is likely to be pressed by the thumb, and the operating piece 124 is naturally placed in a position slightly diagonally shifted from the position facing the front of the body. For this reason, it is preferable that there be no irregularities that would impede visual recognition in the angular range where the central angle with the operating piece on the circumference of the cap body 122 is from ±25° to 65°. Specifically, it is preferable that the puncture depth setting portion 163 and the cap-side guide groove 146 are not in this angle range, and a pair of puncture depth setting portions 163 are provided facing each other on the circumference of the cap body 122. In this case, it is preferable that the circumferential position of one puncture depth setting section 163 and the circumferential position of the operation piece 124 overlap. In this case, the direction in which the puncture depth setting section 163 protrudes (the direction connecting the puncture depth setting section 163 and the central axis of the housing 102) matches the direction in which the operation piece 124 is pressed in a plan view from the distal end side. do. In addition, when the cover locking protrusion 147 is provided, it is preferable that the cover locking protrusion 147 is also not within this angle range. It is preferable that the positions be shifted by .degree. Further, it is preferable that no other protrusions or the like exist on the circumference between the puncture depth setting portion 163 and the cover locking protrusion 147.

In this embodiment, the distal end protrusion 153 is provided at the distal end of the lancet hub 111, but the distal protrusion 153 may not be provided. In this case, instead of the mechanism for preventing erroneous rotation of the locking ring 172 using the tip side protrusion 153, another erroneous rotation prevention mechanism can be provided. In addition, if the locking ring can be rotated by some operation from outside the housing 102 without allowing the depth determining protrusion 154 to pass in the puncture preparation state, it would be possible to It is also possible to have a configuration like this. Further, in this embodiment, the depth determining protrusions 154 protrude on both sides of the central axis of the lancet hub 111 so as to face each other. In this way, by arranging the pair of depth determining protrusions 154 symmetrically with respect to the central axis, the lancet 101 is prevented from shaking when the depth determining protrusions 154 collide with the puncture depth setting part 163. can do.

In this embodiment, the depth determining protrusion 154 contacts the locking ring 172 in the puncturing preparation state and prevents the lancet 101 from moving toward the distal end. This configuration has the advantage that the structure can be simplified. However, an abutting protrusion that abuts the locking ring 172 in the puncturing preparation state and prevents the lancet 101 from moving toward the distal end side may be provided separately from the depth determining protrusion 154. With this configuration, since no force is applied to the depth determining protrusion 154 in the puncture preparation state, it is possible to make it more difficult for the depth determining protrusion 154 to become oblique.

In the above embodiment, the depth setting part is provided separately from the cover locking projection 147, but the cover locking projection 147 can also be used as the depth setting part. In this case, although the visibility of the tip of the cap body 122 is reduced, it is possible to reduce blurring during puncturing. Further, the depth determining protrusion may be the distal protrusion 153 or may be provided at the base end of the distal protrusion 153.

In the embodiment described above, the depth determining protrusion 154 comes into contact with the locking ring when the cap is removed, and has the function of fixing the position of the lancet hub. , the function may be separated from the depth determining protrusion 154. Moreover, although the depth determining protrusion 154 is located on the proximal side of the locking ring, the depth determining protrusion 154 may be located within the locking ring. For example, by extending a portion of the locking ring toward the proximal end, positioning the depth determining protrusion 154 within the locking ring, and pressing a button, the depth determining protrusion 154 moves the locking ring. It may also be allowed to pass through.

Further, the depth determining protrusion 154 may be used as a safety mechanism to exclude defective products. For example, if the shaft of the lancet hub is bent significantly due to some abnormal situation, the depth determining protrusion 154 will not be able to pass through the locking ring 172, and puncturing will not be performed, resulting in the shaft of the lancet hub being bent excessively. Defective products can also be made unusable. Further, the cover locking protrusion 147 may be used as a puncture depth setting section. In this case, the number of protrusions provided near the tip can be reduced, and visibility at the tip of the cap body 122 can be further improved. Furthermore, the puncture depth setting section 163 may be provided at approximately the same height as the cover locking protrusion 147. In this case, the effect of suppressing puncturing blur can be improved without excessively impairing visibility.

The puncturing device of the present disclosure is less prone to puncturing blur and can be widely used for blood sampling and the like.

100 Puncture device 101 Lancet 102 Housing 103 Compression coil spring 111 Lancet hub 112 Puncture needle 113 Needle cover 121 Housing body 122 Cap body 124 Operation piece 126 Spring seat 130 Body side guide groove 134 Penetration window 136 Connection rib 138 Connection ring 141 Connection part 142 Support cylinder part 144 Notch groove 146 Cap side guide groove 147 Cover locking protrusion 151 Spring seat 152 Proximal protrusion 153 Distal protrusion 154 Depth determining protrusion 155 Threaded part 156 Gripping part 157 Protrusion 158 Elastic claw 163 Puncture depth setting part 164 Skin contact cylinder part 172 Locking ring 174 Contact leg part 175 Engagement part 176 First passage groove 178 Second passage groove 180 Pressing piece 182 Pressing slope

Claims (3)

a lancet having a lancet hub and a puncture needle integrated with the lancet hub ;
a housing that accommodates the lancet;
a biasing member that biases the lancet in a direction in which the puncture needle protrudes from the housing ;
a locking ring through which the lancet is inserted and rotated to displace the lancet to the distal end side and perform a puncturing operation ;
The housing includes a housing body and a cap body attached to a tip of the housing body,
The cap body has a puncture depth setting part on the distal side of the locking ring ,
By rotating the locking ring, the lancet hub passes through the locking ring and collides with the puncture depth setting section at a position on the distal side of the locking ring to determine the puncture depth. A disposable puncture device that has a protrusion for determining depth. The puncturing device according to claim 1, wherein the depth determining protrusion is in contact with the locking ring when the lancet is in a puncturing preparation state urged by the urging member. The cap body has a transparent skin-contacting cylindrical part that is provided on the distal side of the puncture depth setting part and allows the inside to be visually checked;
The puncture device according to claim 1 or 2, wherein the skin contacting cylinder portion is entirely thinner than a portion of the cap body above the puncture depth setting portion.

Images