Puncture apparatus

Abstract

To provide a puncture apparatus that facilitates puncture of a cannula into a patient's body and also facilitates detachment of an inner needle and the like from an apparatus holder after the cannula has been punctured into the body.SOLUTION: A puncture apparatus 10A includes a cannula unit 60, a puncture unit for puncturing a cannula 62 into a patient's body BO, and a cannula lock 28 slidable along an apparatus holder 20. After an inner needle 52 and the cannula 62 are punctured into the patient's body BO, the cannula lock 28 moves to a lock position to position and fix a cannula support portion 600 to the apparatus holder 20. After the puncture unit 24 is removed from the apparatus holder 20, a drug solution administration apparatus for administering a drug solution to the patient is attached to the apparatus holder 20.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to lancing devices. [Background technology]

[0002] When using a portable drug solution administration device, the device holder is first positioned on the patient's body surface. Conventionally, the device holder has a cannula and a cannula support portion that supports the cannula. The user uses a puncture device to protrude the cannula from the device holder toward the body surface. As the cannula protrudes, it punctures the patient's body. The user then detaches the puncture device from the device holder and then attaches the drug solution administration device to the device holder.

[0003] An example of a puncture device is the insertion device described in Japanese Patent Publication No. 5904500. The puncture device has an inner needle. A cannula is inserted into the body together with the inner needle. The inner needle is then removed from the body while the cannula remains in place, as described in International Publication WO 2016 / 189066. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 5904500 (see especially paragraph

[0089] ) [Patent Document 2] WO 2016 / 189066 (see especially Figures 17 and 19) Summary of the Invention [Problem to be solved by the invention]

[0005] There is a demand for a puncture device that makes it easy to insert the cannula into the patient's body and that makes it easy to remove the inner needle and the like from the device holder after the cannula has been inserted into the body.

[0006] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0007] (1) A first aspect of the present disclosure is a puncture device comprising: a device holder positioned on a body surface of a patient; and a puncture unit detachably attached to the device holder for puncturing a cannula into the body of the patient; wherein a medicinal solution administration device for administering a medicinal solution to the patient can be attached to the device holder after the puncture unit is removed from the device holder, the puncture device comprising: a cannula unit having the cannula and a cannula support portion supporting the cannula; and a cannula lock slidable along the device holder; the puncture unit is positioned on the device holder and comprises a support member movably supporting the cannula unit; an operating member movable relative to the support member; and an operating member movable relative to the support member. the cannula and the inner needle unit are inserted into the body of the patient in a puncture direction, and the inner needle unit has an inner needle that is movably supported and that punctures the body of the patient together with the cannula, and an inner needle holding part that holds the inner needle; a puncture drive part that moves the inner needle unit and the cannula unit in a puncture direction toward the body of the patient when the operating member moves relative to the support member; and a removal drive part that moves the inner needle unit in a removal direction that is the opposite direction to the puncture direction after the cannula and the inner needle have punctured the body of the patient, and the cannula lock moves to a lock position that positions and fixes the cannula support part to the device holder after the puncture drive part has completed the insertion of the inner needle and the cannula into the body.

[0008] As described above, by moving the operating member relative to the support member, the cannula and inner needle can be easily inserted into the patient's body. Moreover, because the cannula support part is positioned and fixed to the device holder by the cannula lock, it is easy to move the inner needle unit in the removal direction while leaving the cannula indwelling in the patient's body.

[0009] (2) In the puncture device described in item (1) above, the support member may be a hollow casing, and in the initial state before the operating member starts to move, the support member may house the inner needle unit and the cannula unit inside the support member.

[0010] With this configuration, the inner needle unit and the cannula unit can be protected by the support member.

[0011] (3) In the puncture device described in item (1) or (2) above, the puncture drive unit has an elastic member and a receiving member that is movably supported on the support member and receives a force from the elastic member in the puncture direction, the operating member has a first engagement portion, and the receiving member has a second engagement portion that engages with the first engagement portion in an initial state before the operating member starts to move, and as the operating member starts to move, the engagement between the first engagement portion and the second engagement portion is released and the receiving member is urged toward the puncture direction by the elastic member, and the receiving member urged toward the puncture direction may push the inner needle holding portion in the puncture direction.

[0012] In this configuration, as the operating member is moved toward the support member, the inner needle holding portion is pushed in the puncture direction by the receiving member, and the cannula support portion is pushed in the puncture direction by the inner needle holding portion. This movement of the receiving member makes it possible to easily insert the cannula into the patient's body.

[0013] (4) In the puncture device described in item (3) above, the receiving member has a third engagement portion, and the inner needle holding portion has a fourth engagement portion that engages with the third engagement portion in the initial state, and after the cannula and the inner needle have punctured the patient's body, the operating member may move in a direction pushing the receiving member to push the receiving member, thereby disengaging the third engagement portion from the fourth engagement portion.

[0014] In this case, the receiving member, inner needle unit, and cannula unit can easily move together in the puncture direction from the initial state until the movement in the puncture direction is completed, and the inner needle unit can easily be detached from the receiving member and moved in the removal direction.

[0015] (5) In the puncture device described in item (4) above, the removal drive unit may have a pressing portion provided on the operating member, and as the operating member moves relative to the support member, the pressing portion may press the receiving member to release the engagement between the third engagement portion and the fourth engagement portion.

[0016] According to this configuration, the inner needle unit can be easily moved in the removal direction simply by moving the operating member in a direction approaching the support member.

[0017] (6) In the puncture device described in any one of items (3) to (5) above, the receiving member pressed by the operating member may push the cannula lock, causing the cannula lock to slide toward the locked position.

[0018] In this case, the cannula support portion can be positioned and fixed to the device holder by a simple operation of pushing the operating member toward the support member.

[0019] (7) In the puncture device described in item (1) or (2) above, the puncture drive unit has a puncture elastic member that urges the inner needle holding unit toward the puncture direction, the operating member has a first engagement portion, and the inner needle holding unit has a second engagement portion that engages with the first engagement portion in an initial state before the operating member starts to move, and as the operating member starts to move, the engagement between the first engagement portion and the second engagement portion is released, and the inner needle holding unit is urged toward the puncture direction by the puncture elastic member, and the inner needle holding unit urged toward the puncture direction may push the cannula support unit in the puncture direction.

[0020] In this configuration as well, the cannula can be easily inserted into the patient's body by moving the operating member.

[0021] (8) In the puncture device described in item (7) above, the removal drive unit has a removal elastic member that urges the inner needle unit in the removal direction, and the operating member has a detachment pusher portion for detaching the puncture elastic member from the inner needle holding unit, and as the operating member moves toward the support member, the detachment pusher portion pushes the puncture elastic member to detach it from the inner needle holding unit, and the removal elastic member may urge the inner needle holding unit that has detached from the puncture elastic member in the removal direction.

[0022] Thus, with this configuration, the inner needle unit can be easily moved in the removal direction by moving the operating member in a direction approaching the support member.

[0023] (9) In the puncture device described in item (7) or (8) above, the operating member may move in a direction pushing the cannula lock, causing the operating member to push the cannula lock, thereby causing the cannula lock to slide toward the locked position.

[0024] In this case, the cannula support portion can be positioned and fixed to the device holder by moving the operating member.

[0025] (10) In the puncture device described in any one of items (1) to (9) above, the operating member may be a hollow housing that is slidably held relative to the device holder and that can house the support member therein, and as the operating member moves in a direction approaching the support member, the inner needle unit and the cannula unit move in the puncture direction, and thereafter, as the operating member moves further in a direction approaching the support member, the inner needle unit moves in the removal direction and the cannula lock moves to the locked position.

[0026] With this configuration, by moving the operating member so that it approaches the support member, it is possible to move the inner needle unit and the cannula unit in the puncture direction, move the inner needle unit in the removal direction, and move the cannula lock to the locked position, thereby preventing the user from making an error in the series of operations.

[0027] (11) In the puncture device described in any one of items (1) to (9) above, the operating member may be slidably held relative to the device holder and may be detachable from the device holder after the cannula lock reaches the locked position.

[0028] With this configuration, the operating member can be easily detached from the device holder.

[0029] (12) In the puncture device described in item (1) above, the puncture drive unit may have an elastic member, a rotating body rotatably supported on the support member and urged by the elastic member, and a conversion member that converts the rotation of the rotating body into movement of the inner needle holding unit along the puncture direction, the operating member has a first engaging portion, and the cannula support unit has a second engaging portion that engages with the first engaging portion in an initial state before the operating member starts to move, and as the operating member starts to move, the engagement between the first engaging portion and the second engaging portion is released, and as the engagement between the first engaging portion and the second engaging portion is released, the elastic member causes the rotating body to rotate, and as the rotating body rotates, the conversion member may move the inner needle unit in the puncture direction.

[0030] In this configuration, when the operating member is moved, the rotating body is urged by the elastic member to rotate, and the conversion member moves the inner needle unit in the puncture direction. Following this, the cannula unit also moves in the puncture direction. Through these operations, the cannula can be easily inserted into the patient's body.

[0031] (13) In the puncture device described in item (12) above, the puncture drive unit may also serve as the removal drive unit, and as the rotating body further rotates after the cannula has been inserted into the body, the conversion member may move the inner needle unit in the removal direction.

[0032] In this case, the inner needle unit can be easily moved in the removal direction by further rotating the rotating body after the cannula has been inserted into the body.

[0033] (14) In the puncture device described in item (12) or (13) above, the support member may have a hook portion, and the device holder may have an engagement groove into which the hook portion engages, and the hook portion may be made detachable from the engagement groove by pushing the periphery of the hook portion of the support member toward the inside of the support member.

[0034] With this configuration, the support member is stably positioned in the device holder until the user performs a pressing operation (detachment operation) on the support member. Also, by performing a detachment operation on the support member, the user can easily remove the support member from the device holder.

[0035] (15) In the lancing device according to any one of the above items (12) to (14), the operating member may be a lever rotatably supported by the support member.

[0036] Since the operating member is supported by the support member, the support member and the operating member can be removed integrally from the device holder.

[0037] (16) In the puncture device described in any one of items (12) to (15) above, the operating member may have an operating portion operated by a user and a pressing portion that presses the cannula lock, and as the user operates the operating member, the pressing portion presses the cannula lock, causing the cannula lock to slide toward the locked position.

[0038] The user can position and fix the cannula support part to the device holder by operating the operating part of the operating member.

[0039] (17) In the puncture device described in any one of items (12) to (16) above, the rotating body may be a first link member, the conversion member may be a second link member connected to the first link member so as to be rotatable relative to the first link member, and the inner needle holding portion may be connected to the second link member.

[0040] The first link member and the second link member constitute a link mechanism. This link mechanism, which has a simple configuration, makes it possible to move the inner needle unit and the cannula unit in the puncture direction and to move the inner needle unit in the removal direction. [Effects of the Invention]

[0041] According to the present disclosure, it is easy to insert the cannula and inner needle into the patient's body, and it is also easy to move the inner needle unit in the removal direction while maintaining the cannula indwelling in the patient's body. [Brief explanation of the drawings]

[0042] [Figure 1] FIG. 1 is a schematic perspective view of a lancing device according to a first embodiment of the present invention in an initial state. [Figure 2] FIG. 2 is an exploded perspective view of the lancing device. [Figure 3] FIG. 3 is a schematic perspective view of an operating member that constitutes the lancing device. [Figure 4] FIG. 4 is a side cross-sectional view of the lancing device in an initial state, as viewed from the width direction perpendicular to the axial direction. [Figure 5] FIG. 5 is a side cross-sectional view showing a state in which the receiving member, the inner needle unit, and the cannula unit have moved in the puncture direction. [Figure 6] FIG. 6 is a side cross-sectional view showing a state in which the receiver member is rotated. [Figure 7]FIG. 7 is a side cross-sectional view showing a state in which the inner needle unit has moved in the removal direction. [Figure 8] FIG. 8 is a schematic perspective view of a lancing device according to a second embodiment of the present invention in an initial state. [Figure 9] FIG. 9 is an exploded perspective view of the lancing device. [Figure 10] FIG. 10 is a schematic perspective view of an operating member that constitutes the lancing device. [Figure 11] FIG. 11 is a side cross-sectional view of the lancing device in an initial state, as viewed from the width direction perpendicular to the axial direction. [Figure 12] FIG. 12 is a side cross-sectional view showing a state in which the inner needle unit and the cannula unit have moved in the puncture direction. [Figure 13] FIG. 13 is a side cross-sectional view showing the cannula lock moved to the locked position. [Figure 14] FIG. 14 is a perspective view of a main portion showing the elastic member for puncturing detached from the inner needle unit. [Figure 15] FIG. 15 is a side cross-sectional view showing a state in which the inner needle unit has moved in the removal direction. [Figure 16] FIG. 16 is a schematic perspective view of a lancing device according to a third embodiment of the present invention in an initial state. [Figure 17] FIG. 17 is an exploded perspective view of the lancing device. [Figure 18] FIG. 18 is an exploded perspective view of the operating member and the support member that constitute the lancing device. [Figure 19] FIG. 19 is a side cross-sectional view of the lancing device in the initial state, as viewed from the width direction perpendicular to the axial direction. [Figure 20] FIG. 20 is a side cross-sectional view showing a state in which the inner needle unit and the cannula unit have moved in the puncture direction. [Figure 21] FIG. 21 is a side cross-sectional view showing a state in which the inner needle unit has moved in the removal direction. DETAILED DESCRIPTION OF THE INVENTION

[0043] In the following, the term "user" refers to an operator who uses the lancing devices 10A to 10C to insert the cannula 62 into the patient's body BO (see FIG. 4). A typical example of the user is a patient. The user may also be a medical professional such as a doctor.

[0044] [First embodiment] Fig. 1 is a schematic perspective view of a lancing device 10A according to the first embodiment in an initial state (described below). Fig. 2 is an exploded perspective view of the lancing device 10A. The lancing device 10A includes a device holder 20, a lancing unit 24, a cannula unit 60 (see Fig. 2), and a cannula lock 28. The lancing unit 24 is removably attached to the device holder 20. The cannula lock 28 is slidably attached to the device holder 20.

[0045] As shown in FIG. 2, the device holder 20 has a base portion 202 extending along the axial direction and a U-shaped wall portion 220 bent approximately perpendicular to the base portion 202. Hereinafter, for each component, the end portion facing one axial direction of the device holder 20 will be referred to as the front end, and the end portion opposite the front end will be referred to as the rear end. The rear end of the device holder 20 is the end portion where the U-shaped wall portion 220 is not formed. Furthermore, the direction perpendicular to the axial direction and away from the patient's body surface BS (see FIG. 4) will be referred to as the removal direction. For each component, the end portion facing the body surface BS will be referred to as the bottom end, and the end portion opposite the bottom end will be referred to as the top end. The direction perpendicular to both the axial direction and the removal direction will be referred to as the width direction.

[0046] Furthermore, the direction in which the cannula 62 and inner needle 52 move toward the patient's body BO is called the puncture direction, and the direction opposite to the puncture direction is called the withdrawal direction. The puncture direction and withdrawal direction are collectively called the insertion / removal direction. The angle between the body surface BS and the insertion / removal direction is an acute angle, and is preferably between 40° and 50°.

[0047] As shown in Fig. 2, base portion 202 is a plate-like portion having main surface 204 facing puncturing unit 24 and back surface 206 facing the patient's body surface BS. An adhesive sheet S shown in Fig. 4 is provided on back surface 206, which is a flat surface. By attaching adhesive sheet S to body surface BS, device holder 20 is positioned on body surface BS. At this time, main surface 204 is positioned approximately parallel to body surface BS.

[0048] Returning to FIG. 2, the base portion 202 is formed with a pair of sliding slits 208 and a pair of locking slits 210. The pair of sliding slits 208 and the pair of locking slits 210 extend along the axial direction. The pair of sliding slits 208 are longer than the pair of locking slits 210. In the width direction, the pair of locking slits 210 are located inside the pair of sliding slits 208.

[0049] A first removal hole 212 and a second removal hole 214 are connected to each of the pair of sliding slits 208. The first removal hole 212 and the second removal hole 214 are through grooves for removing the operating member 30 constituting the puncture unit 24 from the device holder 20. The first removal hole 212 is located on the outer side in the width direction at the front end of each of the pair of sliding slits 208. The second removal hole 214 is located closer to the front end of each of the pair of sliding slits 208 than the center between the front and rear ends.

[0050] A first locking protrusion 216 is provided around each of the pair of locking slits 210. The first locking protrusion 216 is a part of the device holder 20. That is, a portion of the device holder 20 adjacent to the rear end of each of the pair of locking slits 210 protrudes in the removal direction. This protruding portion is the first locking protrusion 216. The first locking protrusion 216 is located more inward in the width direction than each of the pair of locking slits 210.

[0051] A pair of insertion holes 218 are formed in the base portion 202 at positions closer to the front end than the pair of sliding slits 208. In the width direction of the base portion 202, the pair of insertion holes 218 are located more inward than the pair of sliding slits 208 and more outward than the pair of locking slits 210.

[0052] The device holder 20 has a through hole 224 formed in the base portion 202. The through hole 224 is located inward from the pair of locking slits 210. The axial length of the through hole 224 is slightly larger than that of the pair of locking slits 210.

[0053] In the first embodiment, the puncture unit 24 has a support member 40, an operating member 30, an inner needle unit 50, a puncture drive section 70, and a removal drive section 80. In the illustrated example, the support member 40 is a hollow casing 41, and the operating member 30 is a hollow housing 31. However, the support member 40 is not limited to the casing 41, and the operating member 30 is not limited to the housing 31. The support member 40 may be, for example, in the shape of a frame. The operating member 30 may be, for example, a switch such as a button.

[0054] 2 and 3, the housing 31 constituting the operating member 30 has a skirt portion 300 facing the device holder 20, a main body portion 310 connected to the top end of the skirt portion 300, and a restricting portion 320 connected to the front end of the main body portion 310. The front end of the restricting portion 320 is closer to the front end of the device holder 20 than the front end of the skirt portion 300.

[0055] The skirt portion 300 has a pair of first hook claws 302 and a pair of second hook claws 304. The pair of first hook claws 302 are closer to the front end than the pair of second hook claws 304. The pair of second hook claws 304 are located near the rear end of the skirt portion 300. When the lancing unit 24 is attached to the device holder 20, the first hook claws 302 and the second hook claws 304 are inserted into the first removal hole 212 (see FIG. 2 ) and the second removal hole 214. In this state, the housing 31 is pulled toward the rear end of the device holder 20. As a result, the housing 31 slides toward the rear end along the main surface 204 of the base portion 202 while being guided by the pair of sliding slits 208. As a result, the first hook claws 302 and the second hook claws 304 hook onto the back surface 206 of the device holder 20. This prevents pricking unit 24 from coming off device holder 20 .

[0056] When puncturing unit 24 is to be detached from device holder 20, housing 31 slides along main surface 204 of base portion 202 toward the front end of device holder 20 while being guided by a pair of sliding slits 208. When housing 31 moves to the front end side, the positions of first hook claw 302 and first detachment hole 212 are aligned, and the positions of second hook claw 304 and second detachment hole 214 are aligned.

[0057] The inner surface of the skirt portion 300 in the width direction has a recess 306 (see FIG. 3) that is recessed outward in the width direction. The rear end of the skirt portion 300 also has a guide hole 308 for allowing the guide rib 222 of the device holder 20 to pass through.

[0058] As shown in Fig. 3, a protrusion 312 is provided on the inner surface of the main body 310 in the width direction. The protrusion 312 protrudes inward in the width direction. Therefore, inside the housing 31, the bottom end of the protrusion 312 protrudes inward in the width direction compared to the recess 306 of the skirt portion 300. Furthermore, the front end of the protrusion 312 protrudes inward in the width direction compared to the inner surface of the restricting portion 320. Hereinafter, the front end of the protrusion 312 will be referred to as a pressing portion 800. The pressing portion 800 is an inclined surface that is inclined so as to approach the removal direction (the top end of the housing 31) as it moves from the front end of the main body 310 toward the front end of the restricting portion 320.

[0059] The restricting portion 320 has a pair of first engaging portions 322 on its inner surface in the width direction. The pair of first engaging portions 322 protrude inward in the width direction.

[0060] As shown in FIG. 2, the casing 41 has a pair of support walls 400 facing each other in the width direction. Each of the pair of support walls 400 has a leg portion 402, a bent portion 406, and a head portion 408. The leg portion 402 extends from the main surface 204 of the base portion 202 in the removal direction. In the removal direction, the length of the front end of the leg portion 402 is greater than the length of the rear end of the leg portion 402. The leg portion 402 has an insertion protrusion 404 at a position near the front end of the bottom end. That is, the pair of support walls 400 each have a pair of insertion protrusions 404. The pair of insertion protrusions 404 are inserted into a pair of insertion holes 218, respectively. A clearance may be formed between the inner surface of each insertion hole 218 and each insertion protrusion 404.

[0061] The bent portion 406 is connected to the top end of the leg portion 402. The bent portion 406 is inclined so as to approach the front end from the rear end as it moves in the removal direction. The inclination direction of the bent portion 406 is parallel to the insertion / removal direction. The head portion 408 is connected to the top end of the bent portion 406. Connecting walls 410 are interposed between the rear ends, front ends, and top ends of the two head portions 408 facing each other in the width direction of the casing 41. Therefore, the top end of the casing 41 has a small box shape.

[0062] A pair of slits 412 are formed in each of the pair of support walls 400. The pair of slits 412 are inclined so as to approach the front end from the rear end in the removal direction. In other words, the pair of slits 412 extend along the insertion / removal direction.

[0063] The casing 41 has an inclined tube portion 414 interposed between the pair of support walls 400 in the width direction. The inclined tube portion 414 has a substantially semi-cylindrical shape and extends from the rear end of the bent portion 406 so as to approach the rear end of the head portion 408 as it moves toward the removal direction. Therefore, the inclined tube portion 414 extends along the insertion / removal direction. The inclined tube portion 414 is not interposed between the rear ends of the two leg portions 402.

[0064] 4, the top end of the casing 41 has a box shape that protrudes in the removal direction from the bent portion 406. The casing 41 has a support tube portion 416 inside the top end.

[0065] 1, in the initial state before the housing 31 starts to move, a part of the connecting wall 410 at the top end of the casing 41 is covered by the connecting wall 324 that forms the top end of the main body 310 of the housing 31. The pair of first hook claws 302 and the pair of second hook claws 304 prevent the housing 31 from coming off the device holder 20, and therefore the connecting wall 324 presses the top end of the casing 41, preventing the casing 41 from coming off the device holder 20.

[0066] As shown in Figures 2 and 4, the casing 41 houses a puncture drive unit 70. In the initial state, the puncture drive unit 70 pushes the inner needle unit 50 and the cannula unit 60 in the puncture direction. In the first embodiment, the puncture drive unit 70 has an elastic member 71 and a receiving member 700. In the illustrated example, the elastic member 71 is a coil spring 72, but the elastic member 71 is not limited to the coil spring 72. The elastic member 71 may also be a disc spring.

[0067] As shown in FIG. 2 , the receiving member 700 has a pair of turning portions 702 facing each other in the width direction. The receiving member 700 has a locking plunger portion 704, a spring receiving portion 706, a second engagement portion 708, a third engagement portion 710, and a retaining claw 712. The third engagement portion 710 has a key groove shape with a portion of the turning portion 702 facing the removal direction cut out, and extends along the insertion / removal direction. The spring receiving portion 706 is interposed between the pair of turning portions 702 and protrudes in a direction substantially perpendicular to the insertion / removal direction. The locking plunger portion 704 protrudes from each of the pair of turning portions 702 in a direction substantially perpendicular to the insertion / removal direction. The protruding direction of the locking plunger portion 704 is opposite to the protruding direction of the spring receiving portion 706.

[0068] The second engagement portions 708 protrude outward in the width direction from each of the pair of turning portions 702. A pillar portion 707 is interposed between each turning portion 702 and the second engagement portion 708. The pillar portion 707 is movably inserted into the slit 412 of the casing 41. The second engagement portions 708 are exposed from the slit 412. Therefore, the second engagement portions 708 do not interfere with the inner surface of the slit 412. In an initial state, the second engagement portions 708 engage with the first engagement portions 322 of the housing 31 (see FIG. 3).

[0069] 2, the holding claws 712 are provided at the ends in the puncture direction of each of the pair of turning portions 702. The holding claws 712 protrude inward in the width direction.

[0070] 4, the end of the coil spring 72 in the removal direction is inserted into the support tube portion 416 inside the top end of the casing 41. The end of the coil spring 72 in the puncture direction abuts against the spring receiving portion 706 of the receiving member 700. In the initial state, the coil spring 72 abuts against the spring receiving portion 706 in a compressed state. Therefore, a force in the puncture direction is applied from the coil spring 72 to the receiving member 700.

[0071] As shown in FIG. 2 , the inner needle unit 50 has an inner needle 52 and an inner needle holding portion 500 that holds the inner needle 52. The inner needle 52 extends from the inner needle holding portion 500 in the puncture direction and is inserted into the lumen of the cannula 62 so as to be relatively movably connected to the cannula 62. The inner needle holding portion 500 has a fourth engagement portion 502 and a guide protrusion 504 at its end in the removal direction. The fourth engagement portion 502 protrudes toward the rear end. The guide protrusion 504 protrudes outward in the width direction. In the initial state, the fourth engagement portion 502 engages with the third engagement portion 710 of the receiving member 700, and the guide protrusion 504 is movably inserted into the slit 412 of the casing 41.

[0072] The cannula unit 60 has a cannula 62 and a cannula support part 600 that holds the cannula 62. The cannula 62 extends from the cannula support part 600 in the puncture direction. The cannula support part 600 has a tube connection part 602. The tube connection part 602 extends toward the rear end. The tube connection part 602 is a part to which a liquid supply tube that constitutes a drug solution administration device (not shown) is connected. The drug solution is sent from the liquid supply tube of the drug solution administration device to the tube connection part 602, and then administered to the patient via the cannula 62.

[0073] Cannula support part 600 has second locking protrusion 604 and holding protrusion 606. Second locking protrusion 604 and holding protrusion 606 protrude outward in the width direction from the side surface of cannula support part 600. Second locking protrusion 604 extends along the axial direction at the bottom end of cannula support part 600. When cannula unit 60 moves to the end in the puncture direction, second locking protrusion 604 overlaps with first locking protrusion 216 of device holder 20 in the removal direction.

[0074] Holding protrusion 606 is inclined so as to be approximately perpendicular to the insertion / removal direction and approximately parallel to holding claw 712. In the initial state, holding protrusion 606 is engaged with holding claw 712. Receiving member 700 is movably supported on casing 41 by having pillar portion 707 (see FIG. 2) pass through slit 412 of casing 41. Therefore, cannula unit 60 is movably supported on casing 41 via receiving member 700.

[0075] In the first embodiment, the removal drive member 80 includes a pressing member 800 inside the housing 31. As will be described later, the pressing member 800 moves the inner needle unit 50, which is located at the end in the puncture direction, in the removal direction.

[0076] Cannula lock 28 has a pair of arm portions 250 extending along the axial direction and a connecting end portion 252 interposed between arm portions 250 in the width direction. In the first embodiment, connecting end portion 252 is the front end of cannula lock 28. Arm portions 250 face the rear end of device holder 20. Each arm portion 250 has a pair of clamp portions 254 at its rear end. Each clamp portion 254 has a first locking claw 256 and a second locking claw 258 that protrude inward in the width direction. First locking claw 256 faces base portion 202 of device holder 20, and second locking claw 258 faces the removal direction. The bottom end of first locking claw 256 is movably inserted into each locking slit 210 formed in base portion 202.

[0077] Cannula lock 28 is movable from an unlocked position to a locked position along a pair of locking slits 210. In the first embodiment, the unlocked position is at the front end of device holder 20, and the locked position is at the rear end of device holder 20. When cannula lock 28 is in the unlocked position, first locking protrusion 216 and second locking protrusion 604 are not constrained by each clamping portion 254. In contrast, when cannula lock 28 is in the locked position, first locking protrusion 216 and second locking protrusion 604 are constrained by each clamping portion 254.

[0078] Next, the operation of lancing device 10A will be described.

[0079] First, as shown in FIG. 4, the device holder 20 is attached to the patient's body surface BS via an adhesive sheet S. The device holder 20 is attached to the body surface BS, for example, with the front end facing the patient's left hand and the rear end facing the patient's right hand. At this point, the housing 31, which is the operating member 30, has not yet started to move, and the lancing device 10A is in its initial state. In the initial state, each of the first hook claws 302 (see FIG. 2) is hooked on the back surface 206 of the base portion 202 at a position away from the first detachment hole 212, and each of the second hook claws 304 is hooked on the back surface 206 of the base portion 202 at a position away from the second detachment hole 214. This prevents the housing 31 from falling off the device holder 20.

[0080] As described above, in the initial state, the second engaging portion 708 (see FIG. 2) of the receiving member 700 engages with the first engaging portion 322 (see FIG. 3) of the housing 31, and, as shown in FIG. 4, the fourth engaging portion 502 of the inner needle holding portion 500 engages with the third engaging portion 710 of the receiving member 700. In addition, the holding claws 712 of the inner needle holding portion 500 engage with the holding projections 606 of the cannula support portion 600. The pillar portions 707 of the receiving member 700 and the guiding projections 504 of the inner needle holding portion 500 are movably inserted into the slits 412.

[0081] Furthermore, the receiving member 700, the inner needle unit 50, and the cannula unit 60 are positioned at the end in the removal direction. Therefore, the coil spring 72 is in a compressed state. Furthermore, the cannula lock 28 is positioned in the unlocked position.

[0082] Next, as shown in FIG. 5 , the user grasps the housing 31 with their hand and moves the housing 31 toward the front end of the device holder 20. As this movement occurs, the second engagement portion 708 moves to the rear end relative to the first engagement portion 322 and disengages from the first engagement portion 322. That is, the engagement between the first engagement portion 322 and the second engagement portion 708 is released, and the receiving member 700 is released from the constraint of the housing 31. As a result, the coil spring 72 expands. The expanded coil spring 72 presses the spring receiving portion 706 of the receiving member 700 in the puncture direction. Therefore, the receiving member 700, the inner needle unit 50, and the cannula unit 60 move together in the puncture direction.

[0083] As a result, the cannula 62 and the inner needle 52 are exposed from the through-hole 224 (see FIG. 2) of the device holder 20 and inserted into the patient's body BO (see FIG. 5). The cannula 62 inserted into the body BO is in a position inclined at a predetermined angle with respect to the removal direction and the axial direction. In addition, the second locking protrusion 604 of the cannula support part 600 overlaps with the first locking protrusion 216 of the device holder 20. The second locking protrusion 604 is positioned in the removal direction relative to the first locking protrusion 216.

[0084] As shown in FIG. 6 , after the inner needle 52 and the cannula 62 have punctured the cannula, the user further moves the housing 31 toward the front end. This movement causes a corner 802 at the bottom end of the pressing portion 800 inside the housing 31 to press the second engagement portion 708. Accordingly, the base member 700 rotates about the pivot portion 702. As a result, the third engagement portion 710 of the base member 700 disengages from the fourth engagement portion 502 of the inner needle holding portion 500, and the holding claw 712 of the base member 700 disengages from the holding projection 606 of the cannula unit 60. That is, the engagement between the third engagement portion 710 and the fourth engagement portion 502 is released, and the engagement between the holding claw 712 and the holding projection 606 is released. Therefore, the inner needle unit 50 is released from the restraint of the base member 700, and the base member 700 is released from the restraint of the cannula unit 60.

[0085] As receiver member 700 rotates around pivot portion 702, locking plunger portion 704 of receiver member 700 moves relatively toward the rear end. This movement causes locking plunger portion 704 to push connecting end portion 252 of cannula lock 28, which is in the unlocked position, toward the rear end. As a result, cannula lock 28 moves toward the rear end along main surface 204 of base portion 202 while being guided by locking slit 210.

[0086] In the locked position, the pair of clamping portions 254 clamps the first locking protrusion 216 and the second locking protrusion 604. Specifically, the first locking protrusion 216 and the second locking protrusion 604 are sandwiched between the first locking claw 256 (see FIG. 2) and the second locking claw 258. At this time, the first locking protrusion 216 faces the first locking claw 256, and the second locking protrusion 604 faces the second locking claw 258. This restrains the cannula unit 60 to the device holder 20 (see FIG. 6). In other words, the cannula unit 60 is fixed in position, and the state in which the cannula 62 is inserted into the patient's body BO is maintained.

[0087] As shown in Fig. 7, after the cannula unit 60 has been positioned and fixed to the device holder 20, the user further moves the housing 31 toward the front end. Because the pressing portion 800 inside the housing 31 is an inclined surface, the guide protrusion 504 of the inner needle holding portion 500 moves in the removal direction along the slit 412 while being pressed by the pressing portion 800. This allows the inner needle 52 to be removed from the patient's body BO while maintaining the state in which the cannula 62 is inserted into the patient's body BO. Note that the cannula unit 60, cannula lock 28, and receiving member 700 do not move.

[0088] When the housing 31 has finished moving to the front end, the entire casing 41 is accommodated inside the housing 31. Furthermore, each of the pair of first hook claws 302 is positioned in the first removal hole 212, and each of the pair of second hook claws 304 is positioned in the second removal hole 214. This allows the housing 31 to be removed from the device holder 20. In this state, when the user lifts the housing 31 in the removal direction, the housing 31 is removed from the device holder 20. Accordingly, the casing 41 is released from the pressure exerted by the connecting wall 324 of the housing 31, and the insertion protrusion 404 (see FIG. 2 ) comes out of the insertion hole 218. Therefore, the casing 41, while still accommodated inside the housing 31, is removed from the device holder 20 together with the housing 31.

[0089] Even at this point, the guide projection 504 of the inner needle holding portion 500 and the pillar portion 707 (see Figure 2) of the receiving member 700 are inserted into the slit 412 of the casing 41. Therefore, when the casing 41 is detached from the device holder 20, the inner needle holding portion 500 and the receiving member 700 are simultaneously detached from the device holder 20 together with the casing 41. The cannula unit 60 and the cannula lock 28 remain in the device holder 20.

[0090] Thereafter, the medicinal liquid administration device is removably mounted on the device holder 20. At this time, the liquid supply tube of the medicinal liquid administration device is connected to the tube connection part 602 of the cannula support part 600. The medicinal liquid stored inside the medicinal liquid administration device is supplied to the cannula support part 600 via the liquid supply tube. The medicinal liquid is further administered to the patient's body BO via the cannula 62.

[0091] When removing the medical solution administration device from the device holder 20, the user slides the medical solution administration device toward the rear end along the main surface 204 of the base portion 202 of the device holder 20. Because the cannula 62 is inclined relative to the axial direction, the cannula support portion 600 is less likely to fall off the device holder 20.

[0092] The effects obtained by the first embodiment will be explained in relation to the configuration and operation.

[0093] The puncture device 10A includes a device holder 20, a puncture unit 24, a cannula unit 60, and a cannula lock 28. The puncture unit 24 has a support member 40, an operating member 30, an inner needle unit 50, a puncture drive section 70, and a removal drive section 80. The operating member 30 is movable relative to the support member 40, and the cannula unit 60 and the inner needle unit 50 are movably supported by the support member 40.

[0094] In this configuration, when the operating member 30 moves relative to the support member 40, the puncture drive unit 70 moves the inner needle unit 50 and the cannula unit 60 in the puncture direction toward the patient's body BO. After the inner needle 52 and the cannula 62 have completely punctured the body BO, the cannula lock 28 moves to a locked position where it positions and fixes the cannula support part 600 to the device holder 20. After the cannula 62 and the inner needle 52 have punctured the patient's body BO, the removal drive unit 80 moves the inner needle unit 50 in the removal direction.

[0095] (Effect 1) By moving the operating member 30 relative to the support member 40, the cannula 62 and the inner needle 52 can be easily punctured into the patient's body BO by the puncture drive unit 70. Thereafter, the inner needle unit 50 can be moved in the removal direction by the removal drive unit 80, while leaving the cannula 62 indwelling in the patient's body BO. As a result, the inner needle 52 is easily removed from the patient's body BO.

[0096] Furthermore, the cannula support part 600 constituting the cannula unit 60 is positioned and fixed to the device holder 20 by the cannula lock 28. Therefore, even if the operating member 30 further moves relative to the support member 40 after the cannula 62 has been inserted into the patient's body BO, it is easy to maintain the state in which the cannula 62 is placed in the patient's body BO.

[0097] The support member 40 is a hollow casing 41. In the initial state before the operating member 30 starts to move, the support member 40 accommodates the inner needle unit 50 and the cannula unit 60 inside the support member 40.

[0098] (Effect 2) In the initial state, the inner needle unit 50 and the cannula unit 60 are surrounded by the support member 40 (casing 41). Therefore, the inner needle unit 50 and the cannula unit 60 are protected by the casing 41.

[0099] The operating member 30 is a hollow housing 31 capable of accommodating the support member 40 therein, and is slidable along the main surface 204 of the base portion 202 of the device holder 20. As the housing 31 moves in a direction approaching the support member 40 (the casing 41 in the illustrated example), the inner needle unit 50 and the cannula unit 60 move in the puncture direction. Thereafter, as the housing 31 moves further in a direction approaching the casing 41, the inner needle unit 50 moves in the removal direction and the cannula lock 28 moves to the locked position.

[0100] (Effect 3) By moving the housing 31 closer to the casing 41, it is possible to move the inner needle unit 50 and the cannula unit 60 in the puncture direction, move the inner needle unit 50 in the removal direction, and move the cannula lock 28 to the locked position. This prevents the user from making mistakes in the series of operations described above.

[0101] The housing 31 of the operating member 30 is slidably held relative to the device holder 20. After the cannula lock 28 reaches the locked position, the housing 31 can be removed from the device holder 20.

[0102] (Effect 4) According to this configuration, the operating member 30 can be easily detached from the device holder 20 while the cannula 62 remains inserted into the patient's body BO.

[0103] The first embodiment further provides the following unique effects.

[0104] The puncture drive unit 70 has an elastic member 71 and a receiving member 700 that is movably supported on the support member 40. The receiving member 700 receives a force from the elastic member 71 in the puncture direction. The operating member 30 has a first engagement portion 322, and the receiving member 700 has a second engagement portion 708. In the initial state, the first engagement portion 322 and the second engagement portion 708 are engaged with each other. The engagement between the first engagement portion 322 and the second engagement portion 708 is released as the operating member 30 starts to move relative to the support member 40.

[0105] As a result of this disengagement, the receiving member 700 is urged by the elastic member 71 in the puncture direction. The receiving member 700, urged in the puncture direction, pushes the inner needle holding section 500 that constitutes the inner needle unit 50 in the puncture direction. The inner needle holding section 500 pushes the cannula support section 600 in the puncture direction. As a result, the receiving member 700, the inner needle unit 50, and the cannula unit 60 move in the puncture direction. As a result, the cannula 62 punctures the patient's body BO.

[0106] By moving the operating member 30 toward the support member 40, the engagement between the first engagement portion 322 of the operating member 30 and the second engagement portion 708 of the receiving member 700 is released. As a result of this disengagement, the receiving member 700 is biased by the elastic member 71 so as to move in the puncture direction. As a result, the inner needle holding portion 500 is pushed in the puncture direction by the receiving member 700, and the cannula support portion 600 is pushed in the puncture direction by the inner needle holding portion 500.

[0107] The receiving member 700 has a third engagement portion 710, and the inner needle holding portion 500 has a fourth engagement portion 502. In the initial state, the third engagement portion 710 and the fourth engagement portion 502 are engaged with each other. After the cannula 62 and the inner needle 52 have been inserted into the patient's body BO, the operating member 30 moves in the pushing direction to push the receiving member 700. This releases the engagement between the third engagement portion 710 and the fourth engagement portion 502.

[0108] As can be seen from the above, with this configuration, the receiver member 700, the inner needle unit 50, and the cannula unit 60 can easily move together in the puncture direction from the initial state to the end of movement. Furthermore, because the engagement between the third engagement portion 710 and the fourth engagement portion 502 is released, it is easy to detach the inner needle unit 50 from the receiver member 700 and move the inner needle unit 50 in the removal direction.

[0109] The receiving member 700, pressed by the operating member 30, presses the cannula lock 28. This causes the cannula lock 28 to slide toward the locked position.

[0110] Thus, with this configuration, the cannula support portion 600 can be easily positioned and fixed to the device holder 20.

[0111] The removal drive unit 80 has a pressing unit 800 provided on the operating member 30. As the operating member 30 moves relative to the support member 40, the pressing unit 800 presses the receiving member 700 to release the engagement between the third engagement unit 710 and the fourth engagement unit 502.

[0112] According to this configuration, the inner needle unit 50 can be easily moved in the removal direction simply by moving the operating member 30 in a direction approaching the support member 40.

[0113] [Second embodiment] Next, a lancing device 10B according to a second embodiment will be described with reference to Figures 8 to 15. Note that the same components as those shown in Figures 1 to 7 are given the same reference numerals, and detailed description thereof will be omitted.

[0114] Fig. 8 is a schematic perspective view of the lancing device 10B in its initial state. Fig. 9 is an exploded perspective view of the lancing device 10B. The lancing device 10B comprises a device holder 20, a lancing unit 25, a cannula unit 60 shown in Fig. 9, and a cannula lock 29. The lancing unit 25 is removably attached to the device holder 20. The cannula lock 29 is supported by a cannula support portion 610 in its initial state, and slides along the main surface 204 of the device holder 20 after the inner needle 52 and the cannula 62 have punctured the patient's body BO.

[0115] In the second embodiment, the puncturing unit 25 has a casing 42 as a support member 40, a housing 32 as an operation member 30, an inner needle unit 50, a puncturing drive unit 70, and a removal drive unit 80. The support member 40 may be in the shape of a frame. The operation member 30 may be a switch such as a button.

[0116] 8 to 10, the housing 32 constituting the operating member 30 has a skirt portion 330 facing the device holder 20, and a main body portion 340 connected to the top end of the skirt portion 330. The front end of the main body portion 340 is closer to the front end of the device holder 20 than the front end of the skirt portion 330.

[0117] As in the first embodiment, the skirt portion 330 has a pair of first hook claws 332 and a pair of second hook claws 334. When the housing 32 moves to the front-most side along the main surface 204 of the base portion 202, the positions of the first hook claws 332 and the first removal hole 212 (see FIG. 9 ) are aligned, and the positions of the second hook claws 334 and the second removal hole 214 are aligned.

[0118] 10 , a pair of pressing protrusions 336 are provided at the bottom end of the inner surface of skirt portion 330. A pair of removal pusher portions 338 are provided on the inner surface of skirt portion 330 at positions closer to the removal direction than the pair of pressing protrusions 336. The protruding length of the pair of removal pusher portions 338 is greater than the protruding length of the pair of pressing protrusions 336.

[0119] A pair of claw-shaped first engagement portions 344 are provided on the inner surface of the connecting wall 342 located at the top end of the main body portion 340. The first engagement portions 344 protrude toward the skirt portion 330 and extend in the removal direction.

[0120] The casing 42 has a pair of side walls 420 facing each other in the width direction. Each of the pair of side walls 420 has a pair of leg portions 422, a pair of bent portions 426, and a pair of head portions 428. Each of the pair of leg portions 422 has an insertion protrusion 424 that is inserted into the insertion hole 218 of the device holder 20. As shown in FIG. 8 , in the initial state, a portion of the top end of the casing 42 is covered by the connecting wall 342 of the housing 32. The pair of first hook claws 332 and the pair of second hook claws 334 prevent the housing 32 from coming off the device holder 20, and therefore the connecting wall 342 presses against the top end of the casing 42, preventing the casing 42 from coming off the device holder 20.

[0121] Each bent portion 426 is bent relative to each leg portion 422 so as to be parallel to the insertion / removal direction. A guide rail 427 extending along the insertion / removal direction is provided on the inner surface of each bent portion 426. Each head portion 428 is connected to the top end of each bent portion 426.

[0122] The casing 42 has a first inclined wall 430 and a second inclined wall 432 that are inclined along the insertion / removal direction. The first inclined wall 430 is interposed between a pair of bent portions 426. A pair of insertion slits 434 are formed in the first inclined wall 430. An escape slit 435 is connected to the insertion slits 434.

[0123] The second inclined wall 432 is interposed between the pair of heads 428. An insertion hole 436 is formed in the second inclined wall 432. A cylindrical storage section 440 is provided at the rear end of each of the first inclined wall 430 and the second inclined wall 432. The end of the storage section 440 in the puncture direction is a closed end, and the end of the storage section 440 in the removal direction is an open end. A columnar support section 442 and a fixing section 444 are provided spaced apart on the surface of the storage section 440 at a portion facing the rear end of the device holder 20. The columnar support section 442 extends along the width direction. The fixing section 444 protrudes toward the rear end of the device holder 20 and is hook-shaped.

[0124] The inner needle unit 50 has an inner needle 52 and an inner needle holding section 510 that holds the inner needle 52. The inner needle holding section 510 has a pair of protective walls 512 facing each other in the width direction in a section facing the puncture direction. A pair of support protrusions 514 and a pair of guide protrusions 516 are provided on the outer surfaces of the pair of protective walls 512, respectively. The pair of support protrusions 514 and the pair of guide protrusions 516 protrude outward in the width direction. The inner needle unit 50 is inclined so that the pair of guide protrusions 516 are oriented to extend along the axial direction.

[0125] The inner needle holding portion 510 has a restricting portion 518 in a portion facing the removal direction. The restricting portion 518 is generally trapezoidal in shape and has a spring pressing portion 520 and a second engaging portion 524. The spring pressing portion 520 faces the open end of the storage portion 440. The second engaging portion 524 is part of the top end of the restricting portion 518 and extends parallel to the support protrusion 514. The rear end of the top end of the restricting portion 518 is exposed from the insertion hole 436 of the casing 42.

[0126] The cannula unit 60 has a cannula 62 and a cannula support part 610. The cannula support part 610 has a second locking protrusion 612 on its side surface. The second locking protrusion 612 protrudes outward in the width direction near the bottom end of the cannula support part 610. As shown in FIG. 11 , the second locking protrusion 612 has a rear protrusion 614, an intermediate protrusion 615, and a front protrusion 616. The front protrusion 616 is located further in the removal direction than the rear protrusion 614. The intermediate protrusion 615 is inclined toward the removal direction from the rear end to the front end, and connects the rear protrusion 614 and the front protrusion 616.

[0127] In the initial state, the support protrusion 514 of the inner needle holding section 510 overlaps with the rear protrusion 614. At this time, the support protrusion 514 is positioned further in the removal direction than the rear protrusion 614. In this state, the first locking claw 256 (see FIG. 9) and the second locking claw 258 of the clamp section 254 of the cannula lock 29 surround the rear protrusion 614 and the support protrusion 514. As a result, the cannula support section 610 is supported by the inner needle holding section 510 via the cannula lock 29 (see FIG. 11). The rear protrusion 614 faces the first locking claw 256, and the support protrusion 514 faces the second locking claw 258.

[0128] In the second embodiment, the connecting end 252 of the cannula lock 29 is the rear end of the cannula lock 29. The arm portion 250 and the clamp portion 254 of the cannula lock 29 face the front end of the device holder 20. The unlocked position is the rear end side, and the locked position is the front end side. In the initial state, the front protrusion 616 is exposed from the clamp portion 254 in the unlocked position toward the front end side.

[0129] In the second embodiment, the puncturing drive member 70 is an elastic puncturing member 73, and the removal drive member 80 is an elastic removal member 81. In the aspect shown in Figures 9 and 11, the puncturing elastic member 73 is a double torsion spring 720, and the removal elastic member 81 is a compression spring 810. However, the puncturing elastic member 73 may be any elastic member that is capable of biasing the inner needle holding section 510 in the puncturing direction. The removal elastic member 81 may be any elastic member that is capable of biasing the inner needle holding section 510 in the removal direction. The elastic force (biasing force) of the puncturing elastic member 73 is greater than the elastic force (biasing force) of the removal elastic member 81.

[0130] The double torsion spring 720 has a fixed end 722, a first free end 724, a second free end 726, a first spiral portion 728, and a second spiral portion 730. The first spiral portion 728 is inserted into one end of the columnar support portion 442 in the width direction. The second spiral portion 730 is inserted into the other end of the columnar support portion 442 in the width direction. The fixed end 722 is hooked onto the fixed portion 444. The first free end 724 and the second free end 726 are passed through the respective insertion slits 434 of the casing 42 and abut against the end of the guide protrusion 516 of the inner needle holding portion 510 facing in the removal direction. The first free end 724 and the second free end 726 press the guide protrusion 516 in the puncture direction. As a result, the inner needle holding portion 510 is biased in the puncture direction by the double torsion spring 720. However, in the initial state, the second engaging portion 524 provided on the restricting portion 518 of the inner needle holding portion 510 engages with the first engaging portion 344 provided inside the housing 32. This engagement prevents the inner needle holding portion 510 from moving in the puncture direction.

[0131] The compression spring 810 is housed in the housing section 440 of the casing 42. The end of the compression spring 810 in the puncture direction abuts against the closed end of the housing section 440. In the initial state, the end of the compression spring 810 in the removal direction is exposed from the open end of the housing section 440 and abuts against the spring pressing section 520 of the restricting section 518 in the inner needle holding section 510. In the initial state, the amount of compression of the compression spring 810 is slight.

[0132] Next, the operation of lancing device 10B will be described.

[0133] As in the first embodiment, as shown in Fig. 11, the device holder 20 is attached to the patient's body surface BS via an adhesive sheet S. At this point, the housing 32, which is the operating member 30, has not yet started to move, and the puncture device 10B is in its initial state. In the initial state, the second engagement portion 524 of the inner needle holding portion 510 engages with the first engagement portion 344 of the housing 32, and the cannula support portion 610 is supported by the inner needle holding portion 510 via the cannula lock 29. The cannula lock 29 is in the unlocked position. The inner needle holding portion 510 is also biased in the puncture direction by the double torsion spring 720.

[0134] Next, as shown in FIG. 12 , the user moves the housing 32 toward the front end of the device holder 20. As a result of this movement, the second engagement portion 524 moves to the rear end relative to the first engagement portion 344 and disengages from the first engagement portion 344. This releases the engagement between the first engagement portion 344 and the second engagement portion 524, and the inner needle holding portion 510 is released from the constraint of the housing 32. As described above, the biasing force of the double torsion spring 720, which is the elastic member 73 for puncturing, is greater than the biasing force of the compression spring 810, which is the elastic member 81 for removal. Therefore, the inner needle holding portion 510 is biased in the puncturing direction by the double torsion spring 720. As a result, the inner needle holding portion 510 moves in the puncturing direction. Therefore, the inner needle unit 50 and the cannula unit 60 move together in the puncturing direction. In addition, the compression spring 810 is compressed.

[0135] As a result, the cannula 62 and the inner needle 52 are exposed from the through-hole 224 of the device holder 20 and inserted into the patient's body BO. Also, the bottom end of the first locking claw 256 (see FIG. 9) of the cannula lock 29 is inserted into the locking slit 210 of the device holder 20. Furthermore, the front protrusion 616 constituting the second locking protrusion 612 of the cannula support part 610 overlaps with the first locking protrusion 216 of the device holder 20 (see FIG. 12). The front protrusion 616 is positioned in the removal direction relative to the first locking protrusion 216.

[0136] After the inner needle 52 and the cannula 62 have punctured the cannula, the user further moves the housing 32 toward the front end. As shown in Fig. 13 , this movement causes the pair of pressing protrusions 336 provided inside the housing 32 to push the connecting end 252 of the cannula lock 29, which is in the unlocked position, toward the front end. As a result, the cannula lock 29 moves toward the front end along the main surface 204 of the base portion 202 while being guided by the pair of locking slits 210. Accordingly, the rear protrusion 614 of the second locking protrusion 612 gradually becomes exposed from the clamp portion 254, and the rear protrusion 614 of the second locking protrusion 612 gradually enters the clamp portion 254.

[0137] In the locked position, the pair of clamping portions 254 clamps the first locking protrusion 216 and the front protrusion 616. That is, the first locking protrusion 216 and the front protrusion 616 are sandwiched between the first locking claw 256 (see FIG. 9) and the second locking claw 258. The first locking protrusion 216 faces the first locking claw 256, and the front protrusion 616 faces the second locking claw 258. This restrains the cannula unit 60 to the device holder 20 (see FIG. 13). In other words, the cannula unit 60 is fixed in position, and the cannula 62 remains inserted into the patient's body BO.

[0138] Meanwhile, the support projection 514 of the inner needle holding part 510 is exposed from the clamp part 254 and is located more inward in the width direction than the arm part 250. In other words, the cannula lock 29 is in a state where it does not interfere with the support projection 514. As a result, the connection between the inner needle holding part 510 and the cannula support part 610 is released. In other words, the inner needle unit 50 is released from restraint by the cannula support part 610.

[0139] 14, the pair of removal pusher portions 338 push the first free end 724 and the second free end 726 of the double torsion spring 720 outward in the width direction. Accordingly, the first free end 724 and the second free end 726 move outward in the width direction beyond the guide projection 516 and are inserted into the escape slit 435. As a result, the inner needle holding portion 510 is released from the biasing force of the double torsion spring 720.

[0140] 15, the compression spring 810 expands and urges the inner needle holding portion 510 in the removal direction. As a result, the inner needle holding portion 510 moves in the removal direction. This allows the inner needle 52 to be removed from the patient's body BO while maintaining the state in which the cannula 62 is inserted into the patient's body BO. The cannula unit 60 and cannula lock 29 do not move.

[0141] When the housing 32 has finished moving to the front end, the entire casing 42 is accommodated inside the housing 32. Furthermore, each of the pair of first hook claws 332 is positioned in the first removal hole 212, and each of the pair of second hook claws 334 is positioned in the second removal hole 214. This allows the housing 32 to be removed from the device holder 20. In this state, the user can lift the housing 32 in the removal direction, causing the housing 32 to be removed from the device holder 20. Accordingly, the casing 42 is released from the pressure exerted by the connecting wall 342 of the housing 32, and the insertion protrusion 424 (see FIG. 9 ) comes out of the insertion hole 218. Therefore, the casing 42, while still accommodated inside the housing 32, is removed from the device holder 20 together with the housing 32.

[0142] Even at this point, the guide protrusions 516 of the inner needle holding portion 510 are inserted into the guide rails 427 of the casing 42. Therefore, when the casing 42 is detached from the device holder 20, the inner needle holding portion 510, compression spring 810, and double torsion spring 720 are simultaneously detached from the device holder 20 together with the casing 42. The cannula unit 60 and the cannula lock 29 remain in the device holder 20.

[0143] Thereafter, the medicinal liquid is administered into the patient's body BO via the cannula 62 in the same manner as in the first embodiment.

[0144] In addition to the above-mentioned effects 1 to 4, the second embodiment has the following unique effects.

[0145] The puncture drive unit 70 has a double torsion spring 720 that urges the inner needle holding unit 510 in the puncture direction. The housing 32 has a first engagement portion 344, and the inner needle holding unit 510 has a second engagement portion 524 that engages with the first engagement portion 344 in the initial state. In this configuration, as the housing 32 begins to move relative to the casing 42, the engagement between the first engagement portion 344 and the second engagement portion 524 is released, and the inner needle holding unit 510 is urged in the puncture direction by the double torsion spring 720. The inner needle holding unit 510, urged in the puncture direction, pushes the cannula support unit 610 in the puncture direction.

[0146] As described above, according to the above configuration, the cannula 62 can be inserted into the body BO of the patient by a simple operation.

[0147] The removal drive member 80 has a compression spring 810 that urges the inner needle unit 50 in the removal direction. The housing 32 has a removal pusher member 338 for detaching the double torsion spring 720 from the inner needle holding member 510. In this configuration, as the housing 32 moves toward the casing 42, the removal pusher member 338 pushes the double torsion spring 720, causing it to detach from the inner needle holding member 510. Meanwhile, the compression spring 810 urges the inner needle holding member 510 that has detached from the double torsion spring 720 in the removal direction.

[0148] The inner needle unit 50 can be easily moved in the removal direction simply by moving the housing 32 in a direction approaching the casing 42.

[0149] Housing 32 pushes cannula lock 29 by moving relative to casing 42. This causes cannula lock 29 to slide toward the locked position, i.e., cannula support portion 610 is positioned and fixed relative to device holder 20.

[0150] In this way, by moving the housing 32 relative to the casing 42, the cannula support portion 610 can be positioned and fixed to the device holder 20. In other words, the cannula 62 can be maintained in a state where it is inserted into the patient's body BO.

[0151] [Third embodiment] Next, a lancing device 10C according to a third embodiment will be described with reference to Figures 16 to 21. Note that the same components as those shown in Figures 1 to 15 are given the same reference numerals, and detailed description thereof will be omitted.

[0152] Fig. 16 is a schematic perspective view of the lancing device 10C in its initial state. Fig. 17 is an exploded perspective view of the lancing device 10C. The lancing device 10C includes a device holder 21, a lancing unit 26, a cannula unit 60 shown in Fig. 17, and a cannula lock 28. The lancing unit 26 is removably attached to the device holder 21. The bottom end of the clamp portion 254 of the cannula lock 28 is inserted into the locking slit 210 of the device holder 21. This allows the cannula lock 28 to be slidably held relative to the device holder 21. The connecting end 252 is the front end of the cannula lock 28, and the clamp portion 254 faces the rear end of the device holder 21.

[0153] In the third embodiment, the puncturing unit 26 has a casing 43 as a support member 40, a lever 33 as an operating member 30, an inner needle unit 50, a puncturing drive unit 70, and a removal drive unit 80. The support member 40 may be in the shape of a frame. The operating member 30 may be a switch such as a button.

[0154] The casing 43 has a pair of side walls 450 facing each other in the width direction. Each of the pair of side walls 450 has a pair of leg portions 452, a pair of inclined portions 454, and a pair of head portions 456.

[0155] The widthwise separation distance between the pair of leg portions 452 is greater than that between the pair of inclined portions 454 and the pair of head portions 456. The pair of leg portions 452 have a plurality of hook portions 458. The plurality of hook portions 458 are inserted into the plurality of engagement grooves 226 of the device holder 21, respectively. In this state, the side edges of the plurality of hook portions 458 are positioned outward in the widthwise direction from the side edges of the plurality of engagement grooves 226. This prevents the casing 43 from slipping out of the plurality of engagement grooves 226.

[0156] A notch 460 is formed in a portion of each leg portion 452 and a portion of each inclined portion 454. The rigidity around the notch 460 is smaller than that of other portions of the casing 43. A connecting wall 462 is interposed between the pair of inclined portions 454. An insertion slit 464 is formed in the connecting wall 462. A guide rail 466 extending in the insertion / removal direction is formed on the inner surface of the pair of inclined portions 454. The casing 43 has an insertion opening 468 at its rear end. The insertion opening 468 is an opening surrounded by the pair of head portions 456, the connecting wall 462, and the ceiling wall.

[0157] 17 and 18, a pair of annular protrusions 470 and a pair of first receiving holes 472 are respectively provided on the inner surface of the pair of heads 456. The pair of annular protrusions 470 are located near the insertion opening 468. The pair of first receiving holes 472 are closer to the front end. One of the pair of heads 456 has a fixing portion 474 on its inner surface.

[0158] The lever 33 has an operating portion 350, a generally U-shaped biasing leg 352, and a generally U-shaped locking leg 354. The operating portion 350, which has a small hollow box shape, is the top end portion of the lever 33. The operating portion 350 has a pair of second receiving holes 356 at a position near the front end of the bottom end. As shown in FIGS. 16 and 19, the front end of the operating portion 350 is inserted into an insertion opening 468 of the casing 43. A pair of annular protrusions 470 are inserted into the pair of second receiving holes 356, respectively (see FIG. 19). This allows the lever 33 to be rotatably supported by the casing 43. The center of rotation of the lever 33 is each of the annular protrusions 470.

[0159] As shown in FIGS. 17 to 19, the biasing leg 352 has a pair of first swinging portions 357 that extend from a position near the rear end of the bottom end of the operating portion 350 toward the device holder 21. The pair of first swinging portions 357 face each other in the width direction. Each of the pair of first swinging portions 357 has a first engagement portion 360 at a portion that bends from the rear end toward the front end. The first engagement portion 360 is inserted into the casing 43 through an insertion slit 464 (see FIG. 16).

[0160] 17 and 18, the locking leg 354 surrounds the outside of the biasing leg 352. The locking leg 354 has a pair of second swinging portions 358 located outward in the width direction from the pair of first swinging portions 357. The pair of second swinging portions 358 are located outward in the width direction from the pair of side walls 450 of the casing 43. The bottom end of each second swinging portion 358 is inserted into the inside of the casing 43 via a notch 460. A locking pusher portion 362 protruding inward in the width direction is provided at the bottom end of each second swinging portion 358.

[0161] As shown in Figure 17, the inner needle unit 50 has an inner needle 52 and an inner needle holding portion 530. The inner needle holding portion 530 has a pair of protective walls 532 at its end in the puncture direction. The end of the cannula support portion 620 in the removal direction is inserted between the pair of protective walls 532. The inner needle holding portion 530 has a pair of cylindrical projections 534 at its end in the removal direction. The inner needle holding portion 530 further has guide projections 536 that project in the width direction. The guide projections 536 are slidably inserted into guide rails 466 formed on the inner surface of the casing 43.

[0162] Cannula unit 60 has cannula 62 and cannula support portion 620. A second engagement portion 622 that protrudes outward in the width direction is provided on the side surface of cannula support portion 620. In this embodiment, second engagement portion 622 also serves as a second locking protrusion. However, second engagement portion 622 and second locking protrusion may be provided separately on the side surface of cannula support portion 620.

[0163] In the illustrated example, puncturing drive unit 70 also serves as removal drive unit 80. Hereinafter, puncturing drive unit 70 and removal drive unit 80 will be collectively referred to as insertion / removal drive unit 90, and an embodiment will be described in which puncturing unit 26 is provided with insertion / removal drive unit 90. However, puncturing drive unit 70 and removal drive unit 80 may be separate drive units.

[0164] The insertion / extraction drive unit 90 has an elastic member 91, a rotating body 92, and a conversion member 93. In the illustrated example, the elastic member 91 is a torsion spring 910, the rotating body 92 is a first link member 920, and the conversion member 93 is a second link member 930. The first link member 920 and the second link member 930 constitute a link mechanism 94. This configuration will be described below. However, the elastic member 91 may be any member that is capable of rotationally biasing the rotating body 92. The rotating body 92 may be, for example, a disc-shaped member. The conversion member 93 may be any member that is capable of converting the rotation of the rotating body 92 into movement of the inner needle holding section 530 along the puncture direction.

[0165] The first link member 920 has a pair of oval plates 922. A pair of engagement shafts 924 is provided on the outer surfaces of the pair of oval plates 922 at one end in the longitudinal direction. The pair of engagement shafts 924 extend outward in the width direction. The pair of engagement shafts 924 are rotatably inserted into a pair of first receiving holes 472 formed on the inner surface of the casing 43. One of the pair of engagement shafts 924 is passed through the spiral portion 912 of the torsion spring 910.

[0166] A hook 926 is provided on the outer surface of one of the pair of oval plates 922. A free end 914 of the torsion spring 910 is hooked onto the hook 926. The fixed end 916 of the torsion spring 910 is hooked onto a fixing portion 474 provided on the inner surface of the casing 43.

[0167] A connecting shaft 928 is provided at the other longitudinal ends of the pair of oval plates 922. Both ends of the connecting shaft 928 are connected to the inner surfaces of the pair of oval plates 922. In other words, the pair of oval plates 922 are connected via the connecting shaft 928.

[0168] The second link member 930 has a pair of intermediate plates 932. The pair of intermediate plates 932 are connected via a bridge portion 934 extending along the width direction. A pair of engaging holes 936 is provided at one longitudinal end of each of the pair of intermediate plates 932. The connecting shaft 928 of the first link member 920 is inserted into the pair of engaging holes 936 so as to be rotatable relative to each other. A pair of connecting holes 938 is provided at the other longitudinal end of each of the pair of intermediate plates 932. The pair of columnar protrusions 534 of the inner needle holding portion 530 are inserted into the pair of connecting holes 938 so as to be rotatable relative to each other.

[0169] 19 , the first link member 920 and the second link member 930 are in a rotated position where their respective longitudinal ends are connected to each other to form a V-shape. The apex of the V is the connection where the first link member 920 and the second link member 930 are connected to each other, and faces the bottom ends of the pair of heads 456 of the casing 43. The free end 914 of the torsion spring 910 biases the other longitudinal end of the first link member 920 toward the rear end via the hook 926. As a result, the inner needle holding portion 530 and the cannula support portion 620 are biased in the puncture direction. However, in the initial state, the second engagement portion 622 is engaged with the first engagement portion 360. As a result, the inner needle unit 50 and the cannula unit 60 are prevented from moving in the puncture direction.

[0170] Next, the operation of lancing device 10C will be described.

[0171] As shown in Figure 19, device holder 21 is attached to the patient's body surface BS via adhesive sheet S, as in the first and second embodiments. At this point, lever 33, which is operating member 30, has not yet started to rotate, and lancing device 10C is in its initial state. In the initial state, second engagement portion 622 of cannula support portion 620 is engaged with first engagement portion 360 of lever 33. Cannula lock 28 is in the unlocked position. In addition, first link member 920 is biased toward its rear end by torsion spring 910.

[0172] Next, as shown in Figure 20, the user pushes the operating portion 350 of the lever 33 toward the front end with a finger or the like. This causes the lever 33 to rotate. The center of rotation of the lever 33 is the annular protrusion 470. The lever 33 rotates so that the operating portion 350 moves to the front end and the bottom ends of the pair of first swinging portions 357 and the pair of second swinging portions 358 move to the rear end.

[0173] As lever 33 rotates in this manner, second engagement portion 622 moves to the front end relative to first engagement portion 360, thereby disengaging from first engagement portion 360. As a result, cannula unit 60 is released from the constraint of lever 33. As described above, the other longitudinal end of first link member 920 is biased toward the rear end by torsion spring 910, so first link member 920 rotates so that the other longitudinal end faces the rear end.

[0174] Following this rotation, the second link member 930 rotates such that the other longitudinal end of the second link member 930 moves in the puncture direction. As a result, the inner needle unit 50 and the cannula unit 60 move integrally and linearly in the puncture direction. During this movement, the guide protrusion 536 of the inner needle holding part 530 slides along the guide rail 466 of the casing 43. The cannula 62 and the inner needle 52 are exposed from the through-hole 224 (see FIG. 17 ) of the device holder 21 and puncture the patient's body BO. Furthermore, the second engagement part 622 of the cannula support part 620 overlaps with the first locking protrusion 216 of the device holder 21 in the removal direction.

[0175] The torsion spring 910 biases the other longitudinal end of the first link member 920 further toward the rear end. As a result, as shown in FIG. 21 , the first link member 920 and the second link member 930 move to a rotational position where they form a V-shape. The apex of the V-shape is inserted into the front end of the operating part 350 of the lever 33. As the first link member 920 and the second link member 930 rotate in this manner, the inner needle unit 50 moves linearly in the removal direction. This allows the inner needle 52 to be removed from the patient's body BO while maintaining the state in which the cannula 62 is inserted into the patient's body BO.

[0176] The other end in the longitudinal direction of the first link member 920 comes into contact with the inner surface of the operating portion 350, thereby stopping the rotation of the first link member 920 and the second link member 930. The rotation of the lever 33 also stops.

[0177] 19 to 21, as lever 33 rotates as described above, locking pusher portion 362 at the bottom end of pair of second swinging portions 358 moves toward the rear end. Locking pusher portion 362 pushes connecting end portion 252 of cannula lock 28, which is in the unlocked position, toward the rear end. As a result, as shown in FIGS. 20 and 21, cannula lock 28 moves toward the rear end along main surface 204 of base portion 202 while being guided by locking slit 210.

[0178] 21, clamp portion 254 of cannula lock 28 clamps first locking projection 216 and second engagement portion 622 in the locked position. That is, first locking projection 216 and second engagement portion 622 are sandwiched between first locking claw 256 (see FIG. 17) and second locking claw 258. First locking projection 216 faces first locking claw 256, and second engagement portion 622 faces second locking claw 258. This restrains cannula unit 60 to device holder 21 (see FIG. 21). In other words, cannula unit 60 is fixed in position, and the state in which cannula 62 is inserted into the patient's body BO is maintained.

[0179] Next, the user performs a detachment operation. Specifically, the user grasps a portion of the pair of side walls 450 of the casing 43 with their hands and applies a pushing force from the outside to the inside in the width direction. The portion to which the force is applied to the pair of side walls 450 is preferably the portion around the notch 460 (see FIGS. 16 and 17). The portion around the notch 460 has lower rigidity than other portions. This is because the pair of side walls 450 elastically deforms relatively easily.

[0180] As the pair of side walls 450 elastically deform inward in the width direction, the hook portions 458 and the engagement grooves 226 align with each other. This allows the casing 43 to be detached from the device holder 21. In this state, the user can lift the casing 43 in the detachment direction, causing the casing 43 to detach from the device holder 21. As a result, the insertion / extraction drive unit 90 and the inner needle unit 50 detach from the device holder 21 together with the casing 43. The cannula unit 60 and the cannula lock 28 remain in the device holder 21.

[0181] Thereafter, the medicinal liquid is administered into the patient's body BO via the cannula 62 in the same manner as in the first and second embodiments.

[0182] In addition to the above-described effects 1 and 2, the third embodiment has the following unique effects.

[0183] The puncture drive unit 70 has an elastic member 91, a rotating body 92, and a conversion member 93. The operating member 30 has a first engagement portion 360, and the cannula support portion 620 has a second engagement portion 622 that engages with the first engagement portion 360 in the initial state. The engagement between the first engagement portion 360 and the second engagement portion 622 is released as the operating member 30 starts to move. Following this, the rotating body 92 rotates due to the elastic member 91. The conversion member 93 converts the rotation of the rotating body 92 into movement of the inner needle holding portion 530 along the puncture direction. As a result, the inner needle unit 50 and the cannula unit 60 move in the puncture direction.

[0184] As can be seen from the above, by moving the operating member 30, the cannula 62 can be easily inserted into the patient's body BO.

[0185] The puncture drive unit 70 also serves as the removal drive unit 80. That is, the puncture device 10C is equipped with an insertion / removal drive unit 90. As the rotating body 92 rotates further after the cannula 62 has been inserted into the body BO, the conversion member 93 moves the inner needle unit 50 in the removal direction.

[0186] This makes it possible to easily move the inner needle unit 50 and the cannula unit 60 in the puncture direction despite the simple configuration, and also makes it possible to easily move the inner needle unit 50 in the removal direction after puncture with the cannula 62.

[0187] The support member 40 has a hook portion 458, and the device holder 21 has an engagement groove 226 with which the hook portion 458 is engaged. By pressing the periphery of the hook portion 458 of the support member 40 toward the inside of the support member 40, the hook portion 458 becomes detachable from the engagement groove 226.

[0188] As can be seen from this, the support member 40 is prevented from coming off the device holder 21 until the user performs a detachment operation on the support member 40. In other words, the support member 40 is stably positioned on the device holder 21. Furthermore, the user can easily remove the support member 40 from the device holder 21 by pressing the support member 40.

[0189] In one embodiment, the operating member 30 is a lever 33 rotatably supported on a support member 40 .

[0190] According to this configuration, the support member 40 and the operating member 30 can be detached from the device holder 21 as a unit.

[0191] Operating member 30 has an operating portion 350 that is operated by the user, and a locking plunger portion 362 that presses cannula lock 28. As the user operates operating portion 350, locking plunger portion 362 presses cannula lock 28. This causes cannula lock 28 to slide toward the locked position.

[0192] By operating the operating portion 350 of the operating member 30, the user can insert the cannula 62 into the patient's body BO and also position and fix the cannula support portion 620 to the device holder 21.

[0193] In one embodiment, the rotating body 92 is a first link member 920, and the conversion member 93 is a second link member 930. The second link member 930 is connected to the first link member 920 so as to be rotatable relative to the first link member 920. The inner needle holding portion 530 is connected to the second link member 930.

[0194] The first link member 920 and the second link member 930 constitute a link mechanism 94. The link mechanism 94 has a simple configuration and is capable of moving the inner needle unit 50 and the cannula unit 60 in the puncture direction. It is also possible to move the inner needle unit 50 in the removal direction.

[0195] In the above first to third embodiments, the inner needle 52 and the cannula 62 are inclined at a predetermined angle relative to the body surface BS. However, the inner needle 52 and the cannula 62 may be moved so as to be approximately perpendicular to the body surface BS.

[0196] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0197] 10A to 10C... Lancing device 20, 21... Device holder 24-26: Puncture unit 28, 29: Cannula lock 30...Operation member 40...Support member 50...Inner needle unit 52...Inner needle 60...Cannula unit 62...Cannula 70: Puncture drive unit 80: Removal drive unit 90...insertion / extraction drive unit 92...rotating body 93...Conversion member 254...Clamp portion 336...Pressing convex portion 338...Removal pusher portion 500, 510, 530... Inner needle holding portion 600, 610, 620... Cannula support portion 700... Receiving member 362, 704... Locking plunger portion 720...Double torsion spring 800...Pressing part 810...Compression spring 910...Torsion spring 920...first link member 930...second link member BO…Body BS…Body surface

Claims

1. a device holder to be positioned on the patient's body; a puncture unit removably attached to the device holder for puncturing a cannula into the patient's body; a liquid medicine administration device for administering a liquid medicine to the patient can be attached to the device holder after the lancing unit is detached from the device holder, a cannula unit including the cannula and a cannula support portion that supports the cannula; a cannula lock slidable along the device holder; Equipped with The puncturing unit includes: a support member positioned on the device holder and movably supporting the cannula unit; an operating member that is movable relative to the support member; an inner needle unit that is movably supported by the support member and that includes an inner needle that is inserted into the body of the patient together with the cannula, and an inner needle holding portion that holds the inner needle; a puncture drive unit that moves the inner needle unit and the cannula unit in a puncture direction toward the body of the patient when the operating member moves relative to the support member; a removal drive unit that moves the inner needle unit in a removal direction that is a direction opposite to the puncturing direction after the cannula and the inner needle have been inserted into the body of the patient; and The cannula lock moves to a locking position that fixes the position of the cannula support part to the device holder after the puncture drive part has completed puncturing the body with the inner needle and the cannula.

2. 2. The puncture device according to claim 1, wherein the support member is a hollow casing, and in an initial state before the operating member starts to move, the support member accommodates the inner needle unit and the cannula unit therein.

3. 2. The lancing device according to claim 1, wherein the lancing drive unit includes an elastic member and a receiving member that is movably supported by the support member and receives a force from the elastic member in the lancing direction, The operating member has a first engagement portion, the receiving member has a second engaging portion that engages with the first engaging portion in an initial state before the operating member starts to move, As the operation member starts to move, the engagement between the first engagement portion and the second engagement portion is released, and the receiving member is biased in the puncture direction by the elastic member, The receiving member biased in the puncture direction pushes the inner needle holding portion in the puncture direction.

4. 4. The puncture device according to claim 3, wherein the receiving member has a third engagement portion, and the inner needle holding portion has a fourth engagement portion that engages with the third engagement portion in the initial state, A puncture device in which, after the cannula and the inner needle have punctured the patient's body, the operating member moves in a direction pushing the receiving member, thereby pushing the receiving member and thereby releasing the engagement between the third engagement portion and the fourth engagement portion.

5. 5. The lancing device according to claim 4, wherein the removal drive unit has a pressing unit provided on the operation member, The lancing device, wherein, as the operating member moves relative to the support member, the pressing portion presses the receiving member to release the engagement between the third engaging portion and the fourth engaging portion.

6. The puncture device according to claim 3 , wherein the receiving member, when pressed by the operating member, presses the cannula lock, causing the cannula lock to slide toward the locked position.

7. 2. The puncture device according to claim 1, wherein the puncture drive unit has an elastic puncture member that urges the inner needle holding unit in the puncture direction, The operating member has a first engagement portion, the inner needle holding portion has a second engaging portion that engages with the first engaging portion in an initial state before the operating member starts to move, As the operating member starts to move, the engagement between the first engaging portion and the second engaging portion is released, and the inner needle holding portion is urged in the puncturing direction by the elastic member for puncturing, The inner needle holding portion, biased in the puncture direction, pushes the cannula support portion in the puncture direction.

8. 8. The puncture device according to claim 7, wherein the removal drive section has an elastic removal member that urges the inner needle unit in the removal direction, the operating member has a detachment pusher portion for detaching the elastic member for puncturing from the inner needle holding portion, As the operating member moves toward the support member, the removal pusher portion pushes the elastic member for puncturing to remove it from the inner needle holding portion, The elastic removal member urges the inner needle holding section, which has been detached from the elastic puncturing member, in the removal direction.

9. The puncture device according to claim 7, wherein the operating member moves in a direction that pushes the cannula lock, causing the cannula lock to slide toward the locked position.

10. 10. The puncture device according to claim 1, wherein the operating member is a hollow housing that is slidably held relative to the device holder and that can accommodate the support member therein, and wherein as the operating member moves in a direction approaching the support member, the inner needle unit and the cannula unit move in the puncture direction, and thereafter, as the operating member moves further in the direction approaching the support member, the inner needle unit moves in the removal direction and the cannula lock moves to the locked position.

11. A puncture device according to any one of claims 1 to 9, wherein the operating member is slidably held relative to the device holder and is detachable from the device holder after the cannula lock reaches the locked position.

12. 2. The puncture device according to claim 1, wherein the puncture drive unit comprises an elastic member, a rotating body rotatably supported by the support member and biased by the elastic member, and a conversion member that converts rotation of the rotating body into movement of the inner needle holding part along the puncture direction, The operating member has a first engagement portion, the cannula support portion has a second engaging portion that engages with the first engaging portion in an initial state before the operation member starts to move, As the operation member starts to move, the engagement between the first engagement portion and the second engagement portion is released, When the engagement between the first engaging portion and the second engaging portion is released, the rotating body is rotated by the elastic member, The puncture device, wherein the conversion member moves the inner needle unit in the puncture direction in conjunction with the rotation of the rotating body.

13. 13. The lancing device according to claim 12, wherein the lancing drive unit also serves as the removal drive unit, a puncture device, wherein the conversion member moves the inner needle unit in the removal direction as the rotating body further rotates after the cannula has been inserted into the body.

14. 13. The lancing device according to claim 12, wherein the support member has a hook portion, the device holder has an engagement groove into which the hook portion engages, and the hook portion can be released from the engagement groove by pushing the periphery of the hook portion of the support member toward the inside of the support member.

15. 13. The lancing device according to claim 12, wherein the operating member is a lever rotatably supported by the support member.

16. 13. The puncture device according to claim 12, wherein the operating member has an operating portion operated by a user and a pressing portion that presses the cannula lock, The puncture device, wherein the user operates the operating member and the pressing portion presses the cannula lock, causing the cannula lock to slide toward the locked position.

17. In the lancing device according to any one of claims 12 to 16, the rotating body is a first link member, the conversion member is a second link member connected to the first link member so as to be rotatable relative to the first link member, The inner needle holding portion is connected to the second link member.

Images