JP7429646B2 - lancing device - Google Patents

Description

The present invention relates to a puncturing device.

2. Description of the Related Art Portable administration devices that are attached to the user's skin have been known as devices used to administer medicinal solutions such as insulin into living bodies. For example, Patent Document 1 describes an administration device that includes a cradle that can be attached to a living body, a double-structured puncture device consisting of an inner needle and a cannula, and an inserter for inserting the cannula into the living body. ing. The inserter of the administration device includes a biasing member that applies a biasing force to the puncture tool in a direction to cause the puncture tool to protrude from the cradle.

In the above-described administration device, after a puncture tool is used to puncture a living body using an inserter, the inserter is removed from the cradle while the cannula is engaged with a protrusion on the cradle attached to the living body. Thereafter, by attaching a storage section in which a predetermined medicinal solution or the like is stored to the cradle, the medicinal solution is delivered into the living body through the cannula.

Special Publication No. 2010-531197

The above-described engagement between the cannula and the protrusion is achieved by the cannula riding over the protrusion using part of the biasing force applied to the puncture tool when the puncture tool is inserted into the living body by the inserter. In the process of getting over the protrusion, the cannula also receives force from the protrusion due to contact with the protrusion, so it cannot necessarily be said that the cannula is maintained in a position perpendicular to the skin.

Further, if the user operates the inserter incorrectly, the inserter may not operate in a stable position on the cradle, and the inserter may not be sufficiently fixed (fitted) to the cradle.

An object of the present invention is to provide a puncture device that has excellent operability and can more reliably insert a cannula into a living body.

To achieve the above object, a puncture device according to the present invention includes a main body that can be attached to a living body surface, a cannula, a puncture needle that includes an inner needle inserted into the cannula, and a casing that accommodates the puncture needle. a puncture mechanism that is provided within the casing and performs a puncturing operation that introduces the puncture needle into the living body as the casing rotates relative to the main body; a fixing mechanism for fixing the cannula to the main body in the protruding state; and guiding rotation of the casing so that the casing rotates parallel to a bottom portion of the main body that is attached to the biological surface. and a guide section.

According to the lancing device according to the present invention, when the casing provided with the lancing mechanism is rotated relative to the main body that can be attached to the surface of a living body, the guide part allows the casing to be rotated relative to the bottom of the main body. can be rotated in parallel. Therefore, the user of the puncture device can more reliably insert the cannula into the living body with a simpler operation.

It is a perspective view showing an example of operation of the puncture device concerning an embodiment. It is a perspective view showing an example of operation of the puncture device concerning an embodiment. FIG. 1 is an exploded perspective view of a puncturing device according to an embodiment. FIG. 1 is an exploded perspective view showing a housing of a puncturing device according to an embodiment. It is a figure which shows a part of housing|casing before and after making a puncture needle protrude. FIG. 7 is an enlarged view showing how the housing holding the cannula is engaged with the main body. It is an enlarged perspective view showing a first claw part, a second claw part, a first engaging part, and a second engaging part. It is an enlarged perspective view showing a 1st recessed part and a 2nd recessed part. FIG. 3 is a plan view of the main body. FIG. 1 is a perspective view showing a medical device (medicinal solution administration device) according to an embodiment. FIG. 7 is a perspective view showing a puncturing device according to a modified example. FIG. 7 is a plan view showing a puncturing device according to a modified example. FIG. 7 is a perspective view showing a casing according to a modified example.

Embodiments of the present invention will be described below with reference to the attached drawings. Note that the following description does not limit the technical scope or meaning of terms described in the claims. Further, the dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

1 and 2 are perspective views showing usage examples of the lancing device 100 according to the present embodiment, and FIGS. 3 to 9 are diagrams showing the configuration of each part of the lancing device 100 according to the present embodiment, and FIG. FIG. 1 is an exploded perspective view showing a medical device (medicinal solution administration device) 1 according to the present embodiment.

The puncture device 100 according to this embodiment can be used together with a predetermined liquid delivery mechanism 200 for delivering a drug such as a drug solution (for example, insulin, etc.) (see FIG. 10). The puncture device 100 and the liquid feeding mechanism 200 can constitute a drug solution administration device 1 that administers a drug solution into a living body.

As shown in FIGS. 1 to 3, the puncture device 100 generally includes a main body 10 that can be attached to the surface of a living body, a puncture needle 20 that includes a cannula 21 and an inner needle 22 inserted into the cannula 21, and a housing 30 that accommodates the needle 20; a puncture mechanism 110 that is provided within the housing 30 and performs a puncturing operation that introduces the puncture needle 20 into the living body as the housing 30 rotates relative to the main body 10; , a fixing mechanism 120 (see FIG. 6) that fixes the cannula 21 to the main body 10 in a state in which the puncture needle 20 protrudes from the main body 10; It has a guide part 300 that guides the rotation of the housing 30 so that the body 30 rotates in parallel.

As shown in FIG. 3, the puncture device 100 is provided with a safety cap 40 attached to a casing 30 connected to the main body 10. The main body portion 10 can be attached to a desired location in the living body where the cannula 21 is desired to be placed. When the safety cap 40 is removed, the housing 30 becomes rotatable relative to the main body 10 around the protruding direction Z of the puncture needle 20. In conjunction with the operation of rotating the housing 30 relative to the main body 10, the puncture needle 20 protrudes, the cannula 21 is fixed to the main body 10, and the connection between the main body 10 and the housing 30 is released. is performed continuously.

First, the overall configuration of the puncture device 100 will be described.

As shown in FIGS. 1 to 3, the main body 10 includes an attachment section 16 that can be attached to a living body, and an attachment section that can be attached to a liquid delivery mechanism 200 that delivers a predetermined dose into the living body via a cannula 21. 18, and is configured as a cradle. For example, known resin materials and metal materials can be used for the materials constituting each part of the main body (cradle) 10.

The attachment portion 16 of the main body portion 10 is provided on the bottom surface which is placed facing the surface layer of the skin of a living body when the device is used. The attachment portion 16 can be formed of double-sided tape, adhesive, or the like. Furthermore, the attachment portion 16 can be covered with release paper or the like before use.

As shown in FIG. 3, the attachment part 18 of the main body part 10 has a bottom part 11 on which a flat mounting surface 12 is formed, and a side wall part 13 rising from the bottom part 11. The liquid feeding mechanism 200 can be placed on the placement surface 12 in a state after the casing 30 is removed from the main body 10 (see FIG. 2(B)). The mounting surface 12 is formed with an insertion hole 12a (see FIG. 9(A)) through which the puncture needle 20 can be inserted.

The side wall portion 13 of the main body portion 10 includes a first side wall 13a extending in one direction along the outer periphery of the placing surface 12, and another direction intersecting the first direction along the outer periphery of the placing surface 12. The third side wall 13c extends along the outer periphery of the mounting surface 12, facing the first side wall 13a.

The cannula 21 and the inner needle 22 can be constituted by, for example, a known hollow needle having a flow path formed therein. The outer diameter, inner diameter, length, etc. of the cannula 21 and the inner needle 22 may be of any value as long as they allow puncturing into a living body, and any values can be used depending on the purpose for which they are used.

As shown in FIGS. 3, 4(A), and 4(B), the housing 30 includes a first member 31 that accommodates the puncturing mechanism 110, and a state in which the puncturing needle 20 protrudes when the first member 31 is covered. The second member 35 is rotatably attached to the first member 31 with the direction Z as an axis.

As shown in FIGS. 3 and 4(B), the first member 31 includes a substantially cylindrical body 32 and extends from the outer peripheral surface of the body 32, and the first member 31 is connected to the main body 10. The leg portion 33 abuts against the mounting surface 12 of the mounting portion 18 when the mounting portion 18 is placed on the mounting surface 12 . The outer circumferential surface of the cylindrical body 32 forms a guide surface that guides the rotation of the second member 35 relative to the first member 31 about the protrusion direction Z of the puncture needle 20 as an axis.

As shown in FIGS. 4(B) and 8, the leg portion 33 has a first recess 33a into which the first side wall 13a of the mounting portion 18 is inserted when the first member 31 is connected to the mounting portion 18. and a second recess 33b into which the second side wall 13b of the mounting section 18 is inserted when the first member 31 is connected to the mounting section 18. By inserting the first side wall 13a into the first recess 33a, movement of the first member 31 is restricted in a direction intersecting the extending direction of the first side wall 13a. Further, by inserting the second side wall 13b into the second recess 33b, movement of the first member 31 is restricted in a direction intersecting the extending direction of the second side wall 13b.

As shown in FIGS. 4A and 7, the second member 35 includes a first cylinder 36 having a substantially cylindrical shape and a second cylinder having an outer diameter larger than the outer diameter of the first cylinder 36. The cylindrical body 37, the third cylindrical body 38 connecting the first cylindrical body 36 and the second cylindrical body 37, and the position of the puncture needle 20 with respect to the first cylindrical body 36 and the second cylindrical body 37. It has a knob portion 39 that applies a rotational force about the protrusion direction Z as an axis. By applying a rotational force to the knob portion 39, the user guides the inner circumferential surface of the first cylindrical body 36 of the second member 35 by the outer circumferential surface of the cylindrical body 32 of the first member 31, The second member 35 can be rotated relative to the first member 31.

<Puncture mechanism>
As shown in FIG. 3, the puncture mechanism 110 includes a puncture needle holding part 111 including a first holding part 130 that holds the cannula 21 and a second holding part 140 that holds the inner needle 22, and a puncture needle holding part 111 that holds the puncture needle 20 in the main body part 10. and a biasing member 112 that applies a biasing force in the protrusion direction Z to the puncture needle holder 111 to cause the puncture needle holder 111 to protrude from the puncture needle holder 111 .

The puncture needle holding section 111 has a first holding section 130 that holds the cannula 21 and a second holding section 140 that holds the inner needle 22. The puncture needle holder 111 is housed in the housing 30 in a movable state in the protruding direction Z of the puncture needle 20.

As shown in FIG. 3, the first holding part 130 includes a base part 131 that holds the cannula 21 in a partially protruding state, and a liquid feeding tube that supplies a medicinal solution from the outside of the first holding part 130 is inserted. It has a connection port 132 with a lumen. The first holding part 130 also includes a cap (not shown) attached to cover the connection port 132 and a lid member (not shown) attached to a side of the base 131 that is different from the side that holds the cannula 21. , and a sealing member (not shown) provided between the base 131 and the lid member.

The second holding part 140 has a base part 141 that holds the inner needle 22, as shown in FIG. The base portion 141 removes the inner needle 22 from the cannula 21 as the second holding portion 140 is pulled up from the main body portion 10 .

The biasing member 112 applies a biasing force in the protruding direction Z of the puncture needle 20 within the housing 30 . As shown in FIG. 1A, when the housing 30 is connected to the main body 10, movement of the housing 30 in the protruding direction Z of the puncture needle 20 and in the opposite direction is restricted. Therefore, the urging force applied by the urging member 112 restricts the housing 30 from moving in the protruding direction Z of the puncture needle 20 and the opposite direction. On the other hand, the puncture needle holder 111 is disposed so as to be movable in the protruding direction Z of the puncture needle 20 while housed in the housing 30 . Therefore, the puncture needle holding part 111 moves toward the protruding direction Z of the puncture needle 20 by the urging force applied from the urging member 112. As a result, the puncture needle 20 can pass through the insertion hole 12a formed in the placement surface 12 of the main body 10 and protrude from the main body 10.

Specifically, as shown in FIG. 5A, the top of the knob portion 39 of the second member 35 comes into contact with the second holding portion 140 of the puncture needle holding portion 111, and the second The movement of the holding part 140 is restricted. As shown in FIG. 5(B), when the second member 35 is rotated, the keyhole 39c formed in the knob portion 39 is aligned with the locking protrusion 143 of the second holding portion 140. When the positions of the locking protrusion 143 and the keyhole 39c overlap, the biasing force of the biasing member 112 is released, and the second holding part 140 moves in the protruding direction Z, as shown in FIG. 22 is projected toward the insertion hole 12a of the main body portion 10.

<Fixing mechanism>
As shown in FIG. 6, the fixing mechanism 120 is configured to move as the first holding part 130 moves relative to the main body part 10 in a direction different from the protruding direction Z (rotating action of the second member 35). A fitting part 150 that engages the first holding part 130 with the main body part 10 is provided. The fitting part 150 includes a first fitting part 151 provided on the first holding part 130 side and a second fitting part 152 provided on the main body part 10 side and fitting into the first fitting part 151. Be prepared.

The first holding part 130 and the main body part 10 are arranged so that the first holding part 130 and the main body part When rotated relative to 10, they fit into each other via the respective fitting parts 151 and 152.

<Guide section>
The guide section 300 is configured to support the housing 30 at three or more points relative to the main body 10 when the housing 30 rotates relative to the main body 10 .

In this embodiment, the guide part 300 is a first claw part formed on the second member 35, as shown in FIGS. 7(A), 7(B), 9(A), and 9(B). 310, a second claw part 320, a third claw part 330, and a first engagement part 360, a second engagement part 370, and a third engagement part 380 formed on the main body part 10. There is.

As shown in FIG. 4(A), the first claw part 310, the second claw part 320, and the third claw part 330 are formed on the second cylindrical body 37 of the second member 35.

As shown in FIGS. 3, 9(A), and 9(B), the first engaging portion 360 is formed on the first side wall 13a of the side wall portion 13. As shown in FIG. The second engaging portion 370 is formed on the second side wall 13b of the side wall portion 13. The third engaging portion 380 is formed on the bottom portion 11.

As shown in FIG. 7(A), the first engaging portion 360 is constituted by a hole into which the first claw portion 310 can engage. The second engaging portion 370 is constituted by a hole into which the second claw portion 320 can engage, as shown in FIG. 7(B). As shown in FIGS. 1(A), 9(A), and 9(B), the third engaging portion 380 includes a hole 381 into which the third claw portion 330 can engage.

The first claw portion 310 has a predetermined length along the rotational direction of the second member 35, as shown in FIG. 7(A). The first claw portion 310 separates from the first engagement portion 360 when the second member 35 rotates relative to the main body portion 10 while being engaged with the first engagement portion 360 .

The second claw portion 320 has a predetermined length along the rotational direction of the second member 35, as shown in FIG. 7(B). The second claw portion 320 separates from the second engagement portion 370 when the second member 35 rotates relative to the main body portion 10 while being engaged with the second engagement portion 370 . The second claw portion 320 is formed at a different position from the first claw portion 310 in the circumferential direction of the second member 35 .

As shown in FIG. 4(A), the third claw portion 330 protrudes downward from the second cylindrical body 37 of the second member 35 (the side opposite to the side where the knob portion 39 is arranged). . As shown in FIGS. 1(A) and 1(B), the third claw portion 330 is formed on the main body portion 10 while the second member 35 is rotating relative to the first member 31. The third engaging portion 380 is slid along the third engaging portion 380.

As shown in FIGS. 1(A), 1(B), 9(A), and 9(B), the third engaging portion 380 has an arc shape extending along the rotation direction of the second member 35. This is a cutout hole 381. The hole 381 passes through the mounting surface 12 of the bottom 11 of the main body 10 and the bottom surface (the surface on the side that is placed on the body surface of the living body). Note that FIG. 9(A) is a plan view of the main body 10 seen from the mounting surface 12 side, and FIG. 9(B) is a plan view of the main body 10 seen from the bottom side.

As shown in FIGS. 9A and 9B, the holes 381 are formed at a first portion 381a that guides the sliding movement of the second member 35 with respect to the bottom portion 11, and at an end of the first portion 381a. and a second portion 381b that allows the third claw portion 330 to be removed from the hole portion 381.

The second portion 381b is formed wider than the first portion 381a. Therefore, while the third claw part 330 is slidingly moving in the first part 381a, it is prevented from separating from the first part 381a, and when it reaches the second part 381b, it is inserted into the hole through the second part 381b. You can leave 381.

As described above, the housing 30 and the main body part 10 are connected via the guide part 300 (each claw part 310, 320, 330 and each engaging part 360, 370, 380). The connection between the casing 30 and the main body 10 is such that the second member 35 of the casing 30 is connected to the first holding part 130 (see FIG. 3) of the lancing mechanism 110. It is released by further rotation relative to part 10. Thereby, the user can fix the first holding part 130 of the puncture mechanism 110 to the main body part 10 by a series of simple operations of rotating the second member 35 of the housing 30 relative to the main body part 10. and disconnection of the housing 30 and the main body 10 can be performed successively. Furthermore, while the safety cap 40 restricts the movement of the second holding part 140 by the locking protrusion 143 of the second holding part 140 and the keyhole 39c, the relative rotation of the second member 35 is restricted, and the guide part The respective claw portions 310, 320, 330 of 300 are in a state of being engaged with the respective engaging portions 360, 370, 380, and the connection between the main body portion 10 and the casing 30 can be prevented from being inadvertently disconnected.

<Example of operation of puncturing device>
Next, an example of operation of the puncture device 100 according to this embodiment will be described with reference to FIGS. 1(A), 1(B), 2(A), and 2(B).

The user prepares the puncture device 100 and attaches the puncture device 100 to the body surface using the attachment section 16 provided on the main body section 10. As shown in FIG. 1(A), the user moves the second member 35 of the housing 30 in the direction of arrow Rotate as shown. As shown in FIG. 1(B), the second member 35 of the housing 30 is guided (held) by three claws 310, 320, and 330 when rotating. Therefore, it is possible to prevent the second member 35 of the housing 30 from rotating in an inclined state. Therefore, the casing 30 can be rotated parallel to the bottom 11 of the main body 10, and the puncture needle 20 protrudes with the second member 35 of the casing 30 lifted from the main body 10, and the first holding It is possible to prevent the portion 130 from being attached to the main body portion 10 in an inclined state or from being left in a state where the fitting portion 150 is insufficiently fixed.

As shown in FIGS. 2(A) and 2(B), the user places the first claw part 310 in a position where it comes out of the first engaging part 360 and the second claw part 320 in a position where it comes out of the second engaging part 370. When the third claw portion 330 reaches the second portion 381b of the hole portion 381, the second member 35 of the housing 30 can be removed from the main body portion 10. Note that the puncturing of the puncturing needle 20 by the puncturing mechanism 110 occurs when the second member 35 of the housing 30 rotates to a predetermined position and the locking protrusion 143 and the keyhole 39c are aligned (see FIG. 5(C)). ), the puncture needle 20 protrudes from the insertion hole 12a of the main body 10.

After placing the cannula 21 in the living body using the puncture device 100, the user removes the housing 30 from the main body 10. Next, the user attaches the liquid feeding mechanism 200 to the main body 10, as shown in FIG.

As described above, after the housing 30 is removed from the main body 10, the first holding part 130 remains in the main body 10 with the cannula 21 introduced into the living body. By connecting the liquid delivery mechanism 200 for administering a predetermined drug to the first holding section 130, the drug can be delivered into the living body via the connection port 132 of the first holding section 130.

The liquid feeding mechanism 200 is not particularly limited as long as it is configured to be able to feed a predetermined dose into the cannula 21, but for example, as shown in FIG. A reusable part 210 including a drive mechanism 211 that generates a driving force, a disposable part 220 that can be connected and separated from the reusable part 210, and a drug solution storage part 221 filled with insulin disposed in the disposable part 220 is used. can do. The user can arrange and connect the liquid feeding mechanism 200 on the mounting surface 12 of the main body part 10 with the reusable part 210 and the disposable part 220 connected.

As described above, the puncture device 100 according to the present embodiment includes the main body 10 that can be attached to the surface of a living body, the puncture needle 20 that includes the cannula 21 and the inner needle 22 inserted into the cannula 21, and the housing that houses the puncture needle 20. a puncture mechanism 110 that is provided in the housing 30 and performs a puncturing operation to introduce the puncture needle 20 into the living body as the housing 30 rotates relative to the main body 10; A fixing mechanism 120 that fixes the cannula 21 to the main body 10 in a state protruding from the body 10 and a housing 30 that rotates parallel to the bottom 11 that is attached to the biological surface of the main body 10. It has a guide part 300 that guides the rotation of.

According to the puncture device 100 configured as described above, when the housing 30 in which the puncture mechanism 110 is provided is rotated relative to the main body 10 that can be attached to the surface of a living body, the guide part 300 The housing 30 can be rotated parallel to the bottom 11 of the section 10. Therefore, the user using the puncture device 100 can more reliably insert the cannula into the living body with a simpler operation.

Furthermore, the guide section 300 supports the housing 30 at three or more points relative to the main body 10 when the housing 30 rotates relative to the main body 10 . Therefore, when rotating the casing 30, the user can suitably prevent the casing 30 from being disposed diagonally or from being operated with unstable rotation.

Further, the housing 30 is rotatable relative to the first member 31 that accommodates the puncture mechanism 110 and the first member 31 about the protruding direction of the puncture needle 20 while covering the first member 31. The second member 35 is attached to the second member 35. The main body portion 10 has a side wall portion 13 rising from a bottom portion 11. The guide portion 300 includes a first claw portion 310, a second claw portion 320, and a third claw portion 330 formed on the second member 35, and a first claw portion 310, a second claw portion 320, and a third claw portion 330 formed on the side wall portion 13 and engageable with the first claw portion 310. 1 engaging portion 360, a second engaging portion 370 formed on the side wall portion 13 and engageable with the second claw portion 320, and a third engaging portion 370 formed on the bottom portion 11 and engageable with the third claw portion 330. It has 380. Therefore, the guide part 300 rotates the second member 35 of the housing 30 in a state in which the respective claw parts 310, 320, 330 and the respective engaging parts 360, 370, 380 are engaged. 35 can be rotated parallel to the bottom 11 of the main body 10.

Further, the third engaging portion 380 is a hole portion 381 cut out in an arc shape and extending along the rotation direction of the second member 35 . Therefore, the user can support the second member 35 with respect to the main body 10 by engaging the third claw 330 with the hole 381 formed in the bottom 11 of the main body 10. .

Further, the hole 381 is formed at a first portion 381a that guides the sliding movement of the second member 35 with respect to the bottom portion 11, and at an end of the first portion 381a, and allows the third claw portion 330 to be removed from the hole 381. and a second portion 381b. Therefore, the user can guide the sliding movement of the second member 35 through the hole 381, and can easily move the third claw 330 out of the hole 381 in conjunction with the rotation of the second member 35. be able to.

Note that the first portion 381a may have a stepped structure that allows the third claw portion 330 to slide easily. This stepped structure may be engaged with the third claw part 330, or the third claw part 330 may be inserted into the bag-like structure to form a sliding passage. With this structure, even when rotating the second member 35 of the housing 30 with the main body 10 attached to the surface of a living body, the third claw 330 will not get caught on the double-sided tape or the skin. This allows for a structure that is easy to rotate.

<Modified example>
11 to 13 show a puncturing device 100A according to a modified example. In the puncture device 100A according to the modification, a convex portion 330A, which is a constituent member of the guide portion 300A, is formed on the first member 31 of the main body portion 10. Furthermore, a support portion 380A capable of supporting the convex portion 330A is formed on the inner surface of the third side wall 13c of the side wall portion 13 of the main body portion 10. Note that each claw portion 310, 320 and each engaging portion 360, 370 are the same as in the embodiment described above.

The convex portion 330A has a flange portion 333 formed at an end portion 331 disposed on the support portion 380A side. The support portion 380A has a restriction portion 381c that comes into contact with the flange portion 333 to restrict rotation of the convex portion 330A. The regulating portion 381c is configured to be able to come into contact with the flange portion 333 over a predetermined length.

When rotating the second member 35 of the housing 30, the user can fix and support the first member 31 with respect to the main body 10 until the rotation operation is completed. Therefore, it is possible to prevent the first member 31 from being disposed diagonally or floating up. Therefore, the housing 30 can be rotated parallel to the bottom 11 of the main body 10.

Further, the guide portion 300A according to the modification can be provided in the puncture device 100A without forming the hole 381 in the main body portion 10. Therefore, it is possible to suppress the influence on the arrangement pattern of the attachment part 16 arranged on the bottom surface of the bottom part 11 of the main body part 10, and at the same time, it is possible to prevent the strength of the bottom part 11 from decreasing.

Although the puncturing device according to the present invention has been described above through the embodiments, the present invention is not limited to only the contents explained in the specification, and can be modified as appropriate based on the description of the claims. be.

In the description of the embodiments, a liquid drug administration device has been cited as an application example of the puncture device according to the present invention, but the medical device to which the puncture device is applied is not particularly limited. The medical device may be, for example, a testing device that includes a testing section that is inserted into a living body.

This application is based on Japanese Patent Application No. 2018-209896 filed on November 7, 2018, the disclosure content of which is incorporated by reference in its entirety.

1 drug solution administration device,
10 main body,
11 bottom,
13 side wall part,
13a first side wall;
13b second side wall;
13c third side wall,
20 puncture needle,
21 cannula,
22 Inner needle,
30 housing,
31 first member,
35 second member,
100, 100A puncture device,
110 puncture mechanism,
120 fixation mechanism,
200 liquid feeding mechanism,
210 Reuse Department,
220 Disposable section,
300, 300A guide part,
310 first claw part,
320 second claw part,
330 third claw part,
330A convex part,
333 flange part,
360 first engagement part,
370 second engagement part,
380 third engagement part,
380A support part,
381 hole,
381a 1st part,
381b second part,
381c Regulation Department.

Claims (2)

A main body that can be attached to the surface of a living body,
a puncture needle comprising a cannula and an inner needle inserted into the cannula;
a casing that accommodates the puncture needle;
a puncture mechanism that is provided within the housing and performs a puncture operation that introduces the puncture needle into the living body as the housing rotates relative to the main body;
a fixing mechanism that fixes the cannula to the main body in a state in which the puncture needle protrudes from the main body;
a guide portion that guides rotation of the casing so that the casing rotates parallel to a bottom portion of the main body portion that is attached to the biological surface ;
The guide portion supports the casing at three or more points relative to the main body when the casing rotates relative to the main body,
The casing includes a first member that accommodates the puncture mechanism, and is rotatably attached to the first member while covering the first member about the protruding direction of the puncture needle. a second member;
The main body portion has a side wall portion rising from the bottom portion,
The guide portion includes a first claw portion, a second claw portion, and a third claw portion formed on the second member, and a first engagement portion formed on the side wall portion that is engageable with the first claw portion. a second engaging portion formed on the side wall portion and engageable with the second claw portion; and a third engaging portion formed on the bottom portion and engageable with the third claw portion;
The third engaging portion is a hole cut out in an arc shape extending along the rotation direction of the second member,
The hole includes a first portion that guides the sliding movement of the second member relative to the bottom portion, and a third claw portion that is formed at an end of the first portion and that enables removal of the third claw from the hole. It has 2 parts and
In the puncturing device , the second portion is formed wider than the first portion . A main body that can be attached to the surface of a living body,
a puncture needle comprising a cannula and an inner needle inserted into the cannula;
a casing that accommodates the puncture needle;
a puncture mechanism that is provided within the housing and performs a puncture operation that introduces the puncture needle into the living body as the housing rotates relative to the main body;
a fixing mechanism that fixes the cannula to the main body in a state in which the puncture needle protrudes from the main body;
a guide portion that guides rotation of the casing so that the casing rotates parallel to a bottom portion of the main body portion that is attached to the biological surface;
The guide portion supports the casing at three or more points relative to the main body when the casing rotates relative to the main body,
The casing includes a first member that accommodates the puncture mechanism, and is rotatably attached to the first member while covering the first member about the protruding direction of the puncture needle. a second member;
The main body portion has a side wall portion rising from the bottom portion,
The guide portion is engageable with a first claw portion and a second claw portion formed on the second member, a convex portion formed on the first member, and the first claw portion formed on the side wall portion. a first engaging portion, a second engaging portion formed on the side wall portion and engageable with the second claw portion, and a support portion formed on the side wall portion capable of supporting the convex portion. ,
The convex portion has a flange portion formed at an end portion disposed on the support portion side,
In the puncturing device, the support portion includes a restriction portion that comes into contact with the flange portion and restricts rotation of the convex portion .