JP5396980B2 - Insertion device - Google Patents

Description

  The present invention relates to an insertion device, and more particularly to an insertion device for inserting a cannula in an indwelling member of a hypodermic syringe into a wearer's body.

  2. Description of the Related Art Conventionally, a subcutaneous injector for injecting a drug solution into a wearer's body is known. As a general example of a hypodermic injector, an indwelling member is placed on the body surface of the wearer so that a cannula is inserted into the wearer's body.

  An insertion device for inserting a cannula of an indwelling member as described above into a wearer's body has been conventionally known. Examples of such an insertion device include those described in Patent Documents 1 to 4 below.

US Patent Application Publication No. 2006/0173410 US Patent Application Publication No. 2006/0173414 US Pat. No. 6,355,021 International Publication No. 2005/068006 Pamphlet

  Each of the insertion devices described in Patent Documents 1 to 4 has a function of storing a puncture needle provided in the insertion device after use and preventing erroneous puncture by the puncture needle. However, in the insertion devices described in Patent Documents 1 to 4, the puncture operation with the puncture needle and the storage operation of the puncture needle after the puncture cannot be performed with one hand.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an insertion device capable of performing a puncture operation with a puncture needle and a storage operation of the puncture needle with one-hand operation. It is in.

An insertion device according to the present invention is an insertion device for inserting a cannula in an indwelling member of a hypodermic syringe into a wearer's body, a puncture needle inserted into the cannula, an outer cylinder holding the puncture needle, An inner cylinder inserted into the outer cylinder so as to be coaxial with the outer cylinder, and the outer cylinder can be lifted upward in a state where the cannula is inserted into the body of the wearer. It has an upper end portion exposed from the outer cylinder, can press the upper end portion from above, and has a pressing portion that presses the indwelling member downward when pressed from above.

  In the present specification, “upward” means a direction away from the body surface of the wearer, and “downward” means a direction approaching the body surface of the wearer.

  According to the said structure, an indwelling member is pressed toward a wearer's body surface by pressing an inner cylinder from upper direction. Furthermore, after the cannula is inserted into the wearer's body, the outer cylinder provided coaxially with the inner cylinder can be pulled upward, so that the indwelling member is pressed downward with the pressing portion provided on the inner cylinder, The puncture needle held by the outer cylinder can be pulled upward and stored inside the inner cylinder. Therefore, it is possible to realize the puncture operation with the puncture needle and the storage operation of the puncture needle with one-hand operation.

In the insertion device, the outer cylinder includes a cylindrical main body and a flange portion that protrudes radially outward with respect to the main body.

  According to the said structure, after inserting a cannula in a wearer's body, it becomes easy to pull up the outer cylinder provided coaxially with the inner cylinder.

  In the insertion device, preferably, the inner cylinder includes a cylindrical main body and an engaging portion that protrudes radially inward with respect to the main body and engages with the indwelling member, and the cannula is inserted into the body of the wearer. By pulling up the outer cylinder with respect to the inner cylinder in the inserted state, the engagement between the engaging portion and the indwelling member is released.

  According to the said structure, the indwelling member before inserting in a wearer's body surface can be more reliably hold | maintained because an inner cylinder has an engaging part. Further, after the cannula is inserted into the wearer's body, the engaging portion and the engaging portion are not moved unless the outer tube is pulled up with respect to the inner tube and the puncture needle held by the outer tube is stored in the inner tube. Since the engagement with the indwelling member cannot be released, erroneous puncture by the puncture needle after use can be further advantageously prevented, and the safety of the insertion device is further improved.

  According to the present invention, the puncture operation with the puncture needle and the storage operation of the puncture needle can be realized by one-hand operation.

It is a disassembled perspective view which shows the insertion apparatus which concerns on Embodiment 1 of this invention. It is a perspective view of the outer cylinder contained in the insertion apparatus shown in FIG. It is a figure which shows the III-III cross section in FIG. It is a figure which shows the IV-IV cross section in FIG. It is a perspective view of the inner cylinder contained in the insertion apparatus shown in FIG. It is a figure which shows the VI-VI cross section in FIG. It is a figure which shows the VII-VII cross section in FIG. It is a perspective view which shows the 1st state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the IXA-IXA cross section in FIG. 8, (B) is a figure which shows the IXB-IXB cross section in FIG. It is a perspective view which shows the 2nd state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the XIA-XIA cross section in FIG. 10, (B) is a figure which shows the XIB-XIB cross section in FIG. It is a perspective view which shows the 3rd state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the XIIIA-XIIIA cross section in FIG. 12, (B) is a figure which shows the XIIIB-XIIIB cross section in FIG. It is a disassembled perspective view which shows the insertion apparatus which concerns on Embodiment 2 of this invention. It is a perspective view of the outer cylinder contained in the insertion apparatus shown in FIG. It is a figure which shows the XVI-XVI cross section in FIG. It is a figure which shows the XVII-XVII cross section in FIG. It is a perspective view of the inner cylinder contained in the insertion apparatus shown in FIG. It is a figure which shows the XIX-XIX cross section in FIG. It is a figure which shows the XX-XX cross section in FIG. It is a perspective view which shows the 1st state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the XXIIA-XXIIA cross section in FIG. 21, (B) is a figure which shows the XXIIB-XXIIB cross section in FIG. It is a perspective view which shows the 2nd state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the XXIVA-XXIVA cross section in FIG. 23, (B) is a figure which shows the XXIVB-XXIVB cross section in FIG. It is a perspective view which shows the 3rd state in the use condition of the insertion apparatus shown in FIG. (A) is a figure which shows the XXVIA-XXVIA cross section in FIG. 25, (B) is a figure which shows the XXVIB-XXVIB cross section in FIG.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, unless otherwise specified, it is planned from the beginning to appropriately combine the configurations of the first and second embodiments described later.

(Embodiment 1)
1 is an exploded perspective view showing an insertion apparatus according to Embodiment 1. FIG. Referring to FIG. 1, the insertion device according to the present embodiment includes puncture needle 100, outer cylinder 200, and inner cylinder 300. The insertion device is for inserting the indwelling member 400 constituting the subcutaneous injector into the body of the wearer.

  The indwelling member 400 constitutes a hypodermic injector used for continuous insulin infusion (CSII), and includes a cannula 410, a protrusion 420, and a base 430. The cannula 410 is a part that is inserted into the body of the wearer. The protruding portion 420 is a portion protruding upward with respect to the base portion 430, and the chemical solution is supplied to the cannula 410 by connecting the chemical solution supply portion to the protruding portion. The base part 430 is a part attached to the body surface of the wearer, and an adhesive layer for fixing the base part 430 to the skin of the patient (wearer) on the back surface (the lower surface in FIG. 1). Is provided.

  The subcutaneous injector can also be applied to a use for supplying a medical solution other than insulin into the body (for example, pain treatment).

  The puncture needle 100 is a metal needle and serves as a core material when the cannula 410 is inserted into the wearer's body. The outer cylinder 200 holds the puncture needle 100. The inner cylinder 300 is disposed coaxially with the outer cylinder 200. The outer cylinder 200 and the inner cylinder 300 are relatively movable along the axial direction.

  Next, the structure of the outer cylinder 200 will be described with reference to FIGS. 2 is a perspective view of the outer cylinder 200, and FIGS. 3 and 4 are views showing a III-III section and an IV-IV section in FIG. 2, respectively.

  2 to 4, the outer cylinder 200 is typically a resin member, and includes a contact surface 210, a main body 220, a flange portion 230, and a holding portion 240. The The contact surface 210 is an end surface on the distal end side of the main body 220 and is a surface that contacts the base portion 430 of the indwelling member 400 when the indwelling member 400 is inserted into the wearer's body. The main body 220 is a portion formed in a cylindrical shape. The flange portion 230 is provided integrally with the main body 220 on the base end side of the main body 220, and protrudes radially outward with respect to the main body 220. The flange portion 230 has a convex shape on the upper side (left side in FIGS. 3 and 4) so as to follow the shape of the wearer's finger during a pulling operation described later. The holding portion 240 has a substantially cylindrical shape, and the puncture needle 100 is held on the central axis thereof. In the present embodiment, the holding portion 240 is provided integrally with the main body 220 via a plate-like connecting portion 250 that extends radially outward from a part of the outer peripheral surface thereof. The puncture needle 100 is held so as to be located at the radial center of the outer cylinder 200.

  In addition, the main body 220 of the outer cylinder 200 is integrally provided with a pair of locking claw portions 260 and 260 at the intermediate portion in the axial direction so as to face each other in the radial direction. Each locking claw portion 260 has a tip portion protruding radially inward. Note that the number of the locking claws 260 can be changed as appropriate.

  Next, the structure of the inner cylinder 300 will be described with reference to FIGS. 5 is a perspective view of the inner cylinder 300, and FIGS. 6 and 7 are cross-sectional views taken along lines VI-VI and VII-VII in FIG. 5, respectively.

  5 to 7, the inner cylinder 300 includes a contact surface 310, a main body 320, and a flange portion 330. The contact surface 310 is an end surface on the distal end side of the main body 320 and is a surface that contacts the protruding portion 420 of the indwelling member 400. The main body 320 is a portion formed in a cylindrical shape, and has a large-diameter portion 340 and a small-diameter portion 350, and a step surface between the large-diameter portion 340 and the small-diameter portion 350 serves as a locking surface 360. ing. The main body 320 is provided with a slit 370 extending in the axial direction from the contact surface 310 to the locking surface 360. The main body 320 is inserted into the main body 220 of the outer cylinder 200. At the time of insertion, the connecting portion 250 of the main body 220 of the outer cylinder 200 is inserted into the slit 370 of the main body 320. As a result, the relative rotation between the inner cylinder 300 and the outer cylinder 200 is restricted, and the outer cylinder 200 can move relative to the inner cylinder 300 in a straight line in the axial direction. The main body 320 has a larger axial length than the main body 220 of the outer cylinder 200. The flange portion 330 is formed at the upper end of the main body 320. The flange portion 330 is provided integrally with the main body 320 and protrudes radially outward with respect to the main body 320.

Next, the effect | action of the insertion apparatus which concerns on this Embodiment is demonstrated using FIGS.
FIG. 8 is a perspective view showing a first state in use of the insertion device according to the present embodiment. 9A is a diagram showing a IXA-IXA cross section in FIG. 8, and FIG. 9B is a diagram showing a IXB-IXB cross section in FIG.

  8 and 9 show a state before the indwelling member 400 is installed on the wearer's body surface. As shown in FIGS. 8 and 9, puncture needle 100 is inserted into cannula 410. Thereby, the indwelling member 400 is hold | maintained at an insertion apparatus. The contact surface 210 of the outer cylinder 200 is in contact with the base portion 430 of the indwelling member 400, and the contact surface 310 of the inner cylinder 300 is in contact with the protruding portion 420 of the indwelling member 400.

  The wearer holds the outer cylinder 200 between the thumb and another finger (for example, an index finger). In this state, the cannula 410 is inserted into the wearer's body together with the puncture needle 100. Thereby, the indwelling member 400 is attached to a wearer's body surface.

  FIG. 10 is a perspective view showing a second state following the first state. 11A is a diagram showing a cross section taken along the line XIA-XIA in FIG. 10, and FIG. 11B is a diagram showing a cross section taken along the line XIB-XIB in FIG.

  10 and 11 show a state in which the storing operation for storing the puncture needle 100 protruding from the outer cylinder 200 and the inner cylinder 300 into the inner cylinder 300 is performed. The wearer holds the outer cylinder 200 with other fingers (for example, the index finger and the middle finger) while pressing the flange portion 330 of the inner cylinder 300 with the thumb, and as shown in FIGS. With the flange portion 330 pressed downward, the outer cylinder 200 sandwiched by a plurality of fingers is pulled upward. Thereby, the puncture needle 100 moves upward together with the outer cylinder 200 and is stored in the inner cylinder 300. Here, since the contact surface 310 of the inner cylinder 300 is in contact with the protruding portion 420 of the indwelling member 400, the indwelling member 400 is pressed against the body surface of the wearer. Therefore, in order to prevent the indwelling member 400 from separating from the wearer's body surface, it is not necessary to press the base portion 430 of the indwelling member 400 downward with the other finger, and the storing operation of the puncture needle 100 is performed with one hand. be able to. In the state where the storage operation is completed, as shown in FIG. 11, the locking claw portion 260 provided on the main body 220 of the outer cylinder 200 is locked to the locking surface 360 provided on the main body 320 of the inner cylinder 300. Thus, the outer cylinder 200 is prevented from returning downward relative to the inner cylinder 300, and the puncture needle 100 is securely stored in the inner cylinder 300. Further, in the state where the storing operation is completed, the end surface of the connecting portion 250 provided in the outer cylinder 200 comes into contact with the end surface of the slit 370 provided in the inner cylinder 300, and the outer cylinder 200 is further moved upward. Movement is blocked.

  FIG. 12 is a perspective view showing a third state following the second state. 13A is a view showing a cross section taken along line XIIIA-XIIIA in FIG. 12, and FIG. 13B is a view showing a cross section taken along line XIIIB-XIIIB in FIG.

  12 and 13 show a state in which the insertion device is removed after the installation of the indwelling member 400 is completed. As shown in FIGS. 12 and 13, the insertion device is removed so as to be separated upward with respect to the indwelling member 400. At this time, since the puncture needle 100 is housed in the inner cylinder 300, there is no possibility of erroneous puncture at the tip of the puncture needle 100.

  According to the insertion device according to the present embodiment, since inner cylinder 300 has contact surface 310 that presses indwelling member 400 downward when pressed from above, inner cylinder 300 is pressed from above. Thus, the indwelling member 400 is pressed toward the body surface of the wearer. Furthermore, after the cannula 410 is inserted into the wearer's body, the outer cylinder 200 provided coaxially with the inner cylinder 300 can be lifted upward, so that the indwelling member 400 is brought into contact with the contact surface 310 provided on the inner cylinder 300. The puncture needle 100 held by the outer cylinder 200 can be pulled upward and stored in the inner cylinder 300 while pressing the button downward. Therefore, the puncture operation by the puncture needle 100 and the storage operation of the puncture needle 100 can be realized by one-hand operation.

  Further, since the outer cylinder 200 has a flange portion 230 that protrudes radially outward with respect to the cylindrical main body 220, it is possible to put a finger on the flange portion 230 and attach the cannula 410 to the wearer. After insertion into the body, the outer cylinder 200 provided coaxially with the inner cylinder 300 can be easily lifted upward.

  Furthermore, since the axial length of the inner cylinder 300 is larger than the axial length of the outer cylinder 200 and the upper end portion of the inner cylinder 300 is formed with a flange portion 330 so as to protrude radially outward, the outer cylinder 200. When the puncture needle 100 is housed in the inner cylinder 300 by pulling upward, it is easy to press the inner cylinder 300 from above.

  The above contents are summarized as follows. That is, the insertion device according to the present embodiment is an insertion device for inserting the cannula 410 in the indwelling member 400 of the hypodermic injector into the body of the wearer, and the puncture needle 100 inserted into the cannula 410 and the puncture device An outer cylinder 200 holding the needle 100 and an inner cylinder 300 inserted into the outer cylinder 200 so as to be coaxial with the outer cylinder 200 are provided. The outer cylinder 200 inserts the cannula 410 into the body of the wearer. The inner cylinder 300 can be pressed from above, and when the inner cylinder 300 is pressed from above, the “pressing portion” presses the indwelling member 400 downward. The contact surface 310 is provided.

(Embodiment 2)
FIG. 14 is an exploded perspective view showing the insertion device according to the second embodiment. Referring to FIG. 14, the insertion device according to the present embodiment is a modification of the insertion device according to the first embodiment. Similarly to the first embodiment, puncture needle 100, outer cylinder 200, The inner cylinder 300 is included.

  Next, the structure of the outer cylinder 200 will be described with reference to FIGS. FIG. 15 is a perspective view of the outer cylinder 200, and FIGS. 16 and 17 are views showing an XVI-XVI section and an XVII-XVII section in FIG. 15, respectively.

  Referring to FIGS. 15 to 17, outer cylinder 200 according to the present embodiment is similar to outer cylinder 200 according to the first embodiment, with contact surface 210, main body 220, flange portion 230, and holding portion. 240. The main body 220 is formed with four locking claws 260 in the circumferential direction, and the holding portion 240 is provided integrally with the main body 220 via the connecting portion 250.

  Next, the structure of the inner cylinder 300 will be described with reference to FIGS. 18 is a perspective view of the inner cylinder 300, and FIGS. 19 and 20 are views showing a XIX-XIX section and a XX-XX section in FIG. 18, respectively.

  Referring to FIGS. 18 to 20, inner cylinder 300 according to the present embodiment includes a contact surface 310, a main body 320, and a flange portion 330, similarly to inner cylinder 300 according to the first embodiment. Furthermore, the engaging part 380 and the inclination part 390 are included. The main body 320 includes a large diameter part 340, a small diameter part 350, a locking surface 360, and a slit 370.

  The engaging portion 380 is formed at the lower end of the main body 320 and engages with the protruding portion 420 of the indwelling member 400 to hold the indwelling member 400, as will be described later. The inclined portion 390 is a portion formed on the upper side with respect to the engaging portion 380, and the engaging portion 380 moves radially outward by pushing the inclined portion 390 radially inward. Two engaging portions 380 and inclined portions 390 are formed at positions 180 degrees apart in the circumferential direction, but three or more of these may be formed. The outer surface of the inclined portion 390 is formed so as to spread outward in the radial direction from below to above.

  Next, the effect | action of the insertion apparatus which concerns on this Embodiment is demonstrated using FIGS.

  FIG. 21 is a perspective view showing a first state of the insertion device according to the present embodiment in use. 22A is a view showing a cross section XXIIA-XXIIA in FIG. 21, and FIG. 22B is a view showing a cross section XXIIB-XXIIB in FIG.

  21 and 22 show a state before the indwelling member 400 is installed on the body surface of the wearer.

  As shown in FIGS. 21 and 22, puncture needle 100 is inserted into cannula 410. Further, the engaging portion 380 of the inner cylinder 300 is engaged with a concave portion 420 </ b> A formed in the protruding portion 420 of the indwelling member 400. The radially inner surface of the engaging portion 380 has an inclined surface that extends radially inward from below to above, and the inner cylinder 300 is attached to the indwelling member 400 by having this inclined surface. When pressed, the two engaging portions 380 open and engage with the concave portion 420 </ b> A of the indwelling member 400. Thereby, the indwelling member 400 is hold | maintained at an insertion apparatus.

  Both the contact surface 210 of the outer cylinder 200 and the contact surface 310 of the inner cylinder 300 are in contact with the base portion 430 of the indwelling member 400.

  The wearer holds the outer cylinder 200 between the thumb and another finger (for example, an index finger). In this state, the cannula 410 is inserted into the wearer's body together with the puncture needle 100. Thereby, the indwelling member 400 is attached to a wearer's body surface.

  FIG. 23 is a perspective view showing a second state following the first state. 24A is a diagram showing a cross section XXIVA-XXIVA in FIG. 23, and FIG. 24B is a diagram showing a cross section XXIVB-XXIVB in FIG. 23.

  23 and 24 show a state in which the storing operation for storing the puncture needle 100 protruding from the outer cylinder 200 and the inner cylinder 300 into the inner cylinder 300 is performed. The wearer holds the outer cylinder 200 with other fingers (for example, the index finger and the middle finger) while pressing the flange portion 330 of the inner cylinder 300 with the thumb, and as shown in FIGS. With the flange portion 330 pressed downward, the outer cylinder 200 sandwiched by a plurality of fingers is pulled upward. Thereby, the puncture needle 100 moves upward together with the outer cylinder 200 and is stored in the inner cylinder 300. Here, since the contact surface 310 of the inner cylinder 300 is in contact with the base portion 430 of the indwelling member 400, the indwelling member 400 is pressed against the body surface of the wearer. Therefore, it is not necessary to press the base portion 430 of the indwelling member 400 downward to prevent the indwelling member 400 from moving away from the wearer's body surface, and the storing operation of the puncture needle 100 can be performed with one hand.

  In the state in which the storing operation is completed, the inclined portion 390 is pressed radially inward by the lower end portion of the outer cylinder 200 as shown in FIG. Thereby, the engaging part 380 opens in the direction of the arrow DR380, and the engagement between the engaging part 380 and the protruding part 420 is released. As a result, the insertion device can be removed from the indwelling member 400. Further, in the state in which the storing operation is completed, as shown in FIG. 24, the locking claw portion 260 provided on the main body 220 of the outer cylinder 200 is placed on the locking surface 360 provided on the main body 320 of the inner cylinder 300. The outer cylinder 200 is prevented from returning downward relative to the inner cylinder 300 by being locked, and the puncture needle 100 is securely stored in the inner cylinder 300. Further, in the state where the storing operation is completed, the end surface of the connecting portion 250 provided in the outer cylinder 200 comes into contact with the end surface of the slit 370 provided in the inner cylinder 300, and the outer cylinder 200 is further moved upward. Movement is blocked.

  FIG. 25 is a perspective view showing a third state following the second state. 26A is a diagram showing a cross section XXVIA-XXVIA in FIG. 25, and FIG. 26B is a diagram showing a cross section XXVIB-XXVIB in FIG.

  25 and 26 show a state where the insertion device is removed after the installation of the indwelling member 400 is completed. As shown in FIGS. 25 and 26, the insertion device is removed so as to be separated upward with respect to the indwelling member 400. At this time, the engagement between the engaging portion 380 of the inner cylinder 300 and the protruding portion 420 of the indwelling member 400 is released. Further, since the puncture needle 100 is housed in the inner cylinder 300, there is no possibility of erroneous puncture at the tip of the puncture needle 100.

  The insertion device according to the present embodiment has the same effects as the insertion device according to the first embodiment, and further has the following effects.

  That is, according to the insertion device according to the present embodiment, the inner cylinder 300 has the engaging portion 380 that protrudes inward in the radial direction with respect to the main body 320 and engages with the indwelling member 400. The indwelling member 400 before being inserted into the table can be held more reliably. Further, after the cannula 410 is inserted into the wearer's body, it is not after the outer cylinder 200 is pulled up with respect to the inner cylinder 300 and the puncture needle 100 held by the outer cylinder 200 is stored in the inner cylinder 300. As long as the engagement between the engagement portion 380 and the indwelling member 400 cannot be released, it is possible to more advantageously prevent erroneous puncture by the puncture needle 100 after use, and the safety of the insertion device is further increased. improves.

  The above contents are summarized as follows. That is, the insertion device according to the present embodiment is a modification of the insertion device according to the first embodiment, and has the same configuration as that of the insertion device according to the first embodiment. Includes a cylindrical main body 320 and an engaging portion 380 that protrudes radially inward with respect to the main body 320 and engages with the indwelling member 400, and after the cannula 410 is inserted into the body of the wearer, By pulling up the cylinder 200 with respect to the inner cylinder 300, the engagement between the engaging portion 380 and the indwelling member 400 is released.

  Although the embodiments of the present invention have been described above, the embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 puncture needle, 200 outer cylinder, 210 abutting surface, 220 main body, 230 flange portion, 240 holding portion, 250 connecting portion, 260 locking claw portion, 300 inner cylinder, 310 abutting surface, 320 main body, 330 flange portion, 340 Large diameter part, 350 Small diameter part, 360 Locking surface, 370 Slit, 380 Engagement part, 390 Inclination part, 400 Indwelling member, 410 Cannula, 420 Projection part, 430 Base part.

Claims (2)

An insertion device for inserting a cannula in an indwelling member of a hypodermic syringe into a wearer's body,
A puncture needle inserted into the cannula;
An outer cylinder holding the puncture needle;
An inner cylinder inserted into the outer cylinder so as to be coaxial with the outer cylinder,
The outer cylinder can be pulled upward with the cannula inserted into the wearer's body,
The inner cylinder has an upper end portion exposed from the outer cylinder, can press the upper end portion from above, and has a pressing portion that presses the indwelling member downward when pressed from above. ,
The outer cylinder is an insertion device including a cylindrical main body and a flange portion projecting radially outward with respect to the main body . The inner cylinder includes a cylindrical main body and an engaging portion that protrudes radially inward with respect to the main body and engages with the indwelling member,
The cannula in the state of being inserted into the body of the wearer, by pulling the outer tube to the inner tube, the engagement between the indwelling member and the engaging portion is released, according to claim 1 Insertion device.

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