JP2019136293A - Medical solution injection device - Google Patents

Abstract

To provide a medical solution injection device of a new structure capable of preventing re-exposure of a hollow needle.SOLUTION: There is provided a medical solution injection device 10 in which a chemical solution stored in an interior reservoir 20 is poured out through a hollow needle 12 by a pushing operation of a pusher member 18 from a base end side to a device body 14 equipped with the hollow needle 12 at the tip side, and a needle tip cover 16 for protecting a needle tip 22 of the hollow needle 12 is assembled movably in an axial direction with respect to the device body 14. A positioning mechanism 116 for positing the pusher member 18 at a pushing position to the device body 14 is provided between the pusher member 18 that is pushed directly and the device body 14. Movement of the needle tip cover 16 to the base end side is regulated by a contact action on the pusher member 18 positioned at the pushing position by the positioning mechanism 116.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chemical liquid injector that injects a chemical liquid into a patient's body by pushing a pusher member.

  2. Description of the Related Art Conventionally, as a medical instrument used when injecting a drug solution or the like into a patient in the medical field, a drug solution injection device including a hollow needle is known.

  By the way, if the needle tip removed after the injection of the chemical solution remains exposed, there is a risk of an accidental puncture accident in which a doctor, a nurse, a discarder, or the like accidentally punctures a finger or the like with the exposed needle tip. If an accidental puncture accident occurs, there is a risk of causing an infection due to blood adhering to the needle tip or inadvertently ingesting a chemical solution adhering to the needle tip.

  Therefore, for example, as described in JP-T-2007-506498 (Patent Document 1), there has been proposed a chemical liquid injector provided with a needle tip cover that covers the needle tip after use. That is, in the chemical injection device described in Patent Document 1, a syringe (injection device 4) including a hollow needle (needle 7) is accommodated with respect to a device main body (main body 3) including a needle tip cover (protective sleeve 6). It has come to be. Then, the hollow needle is punctured into the skin and the pusher member (plunger) is pressed (push-in operation), whereby the medical solution stored in the syringe is injected into the patient's body and the hollow needle is removed from the skin. By pulling out, the needle tip cover protrudes from the apparatus main body to the distal end side, so that the needle tip of the hollow needle is protected.

  However, in the chemical injection device described in Patent Document 1, the needle tip cover is only held by the spring (spring 26) in a state where the needle tip of the hollow needle is protected. When an external force is exerted in the direction of being accommodated in the apparatus body, the needle tip may be unintentionally reexposed.

  In addition, as an improvement of the chemical injection device described in Patent Document 1, Japanese Patent Publication No. 2011-510731 (Patent Document 2) discloses that a needle tip cover at a position for protecting the needle tip of a hollow needle is attached to the device body. On the other hand, a fixing means for fixing the needle tip is disclosed, and the problem of re-exposure of the needle tip as described above is solved. However, in the chemical injection device described in Patent Document 2, since the fixing means for the needle tip cover is provided between the needle tip cover and the apparatus main body, the structure of the apparatus main body is likely to be complicated.

  Further, in the chemical liquid injectors described in Patent Documents 1 and 2, a syringe is employed as an internal reservoir for storing the chemical liquid, and the chemical liquid in the syringe is poured out of the apparatus by pushing the plunger of the syringe. It was. Therefore, in use, it is necessary to suck the drug solution sealed in a vial or the like into a syringe, and the operation is troublesome.

Special table 2007-506498 gazette Special table 2011-510731 gazette

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved by the invention described in claims 1 to 9 is that the solution injection of a novel structure capable of preventing the re-exposure of the hollow needle. To provide an apparatus.

  Further, the problem to be solved by the invention described in claims 10 and 11 is to provide a chemical solution injection apparatus having a novel structure that does not require injection of a chemical solution during use and is easy to operate.

  In the first aspect of the present invention, the drug solution stored in the internal reservoir is dispensed through the hollow needle by pushing the pusher member from the proximal end side to the apparatus main body having the hollow needle on the distal end side. At the same time, in the chemical injection device in which a needle tip cover that protects the needle tip of the hollow needle is assembled so as to be movable in the axial direction with respect to the device main body, the pusher member is positioned at the pushing position into the device main body. A positioning mechanism is provided between the pusher member to be directly pushed and the apparatus main body, and the needle tip cover is brought into contact with the pusher member positioned at the pushing position by the positioning mechanism. The movement to the base end side is restricted.

  According to the chemical liquid injector configured in accordance with this aspect, the re-exposure of the needle tip due to the movement of the needle tip cover toward the proximal end is prevented by the abutting action on the pusher member that has been pushed in. Therefore, complication of the apparatus main body for restricting the movement of the needle tip cover toward the proximal end side is avoided. In addition, since the pusher member is pushed directly, it can be moved reliably to the push-in position, and positioning by the positioning mechanism and thus movement regulation to the proximal end side of the needle tip cover can be realized more stably. It becomes.

  Note that the following second or third aspect may be suitably employed as the internal reservoir for storing the chemical solution.

  According to a second aspect of the present invention, in the chemical liquid injector according to the first aspect, a vial including a bottle and a stopper is adopted as the internal reservoir.

  According to a third aspect of the present invention, in the chemical liquid injector according to the first aspect, a prefilled syringe is employed as the internal reservoir.

  In particular, according to the second aspect, by adopting a vial as the internal reservoir, the chemical solution storage part can be simplified. Further, according to the third aspect, employing a prefilled syringe as the internal reservoir eliminates the need for complicated operations such as storing the chemical liquid in the syringe each time.

  According to a fourth aspect of the present invention, in the chemical injection device according to any one of the first to third aspects, in the positioning mechanism, the positioning of the pusher member to the pushing position of the device body is a release operation unit. By adopting a structure that does not include, a reuse prevention mechanism is configured.

  According to the chemical injection device having the structure according to the present embodiment, the release of the positioning of the pusher member pushed into the distal end side with respect to the device main body is virtually impossible, so the provider of the chemical injection device is not assumed. Intentional or unintended reuse by the user is prevented.

  According to a fifth aspect of the present invention, in the chemical injection device according to any one of the first to fourth aspects, the pusher member is pushed into the device main body between the pusher member and the device main body. A lock fixing mechanism that disables the operation is provided.

  According to the chemical injection device having the structure according to this aspect, the pusher member is prevented from being unintentionally pushed in under a situation before use.

  According to a sixth aspect of the present invention, in the chemical injection device according to the fifth aspect, the fixing by the lock fixing mechanism is released by relatively rotating the pusher member and the device main body in the circumferential direction. A pushing operation of the pusher member with respect to the apparatus main body is allowed.

  According to the chemical injection device structured according to this aspect, the pusher member cannot be fixed unless the pusher member is operated in the rotational direction orthogonal to the pushing direction which is the normal operation direction. Therefore, an unintended pushing operation of the pusher member is prevented.

  According to a seventh aspect of the present invention, in the chemical liquid injector according to any one of the first to sixth aspects, a flexible portion that is capable of bending deformation is provided at a proximal end portion of the needle tip cover. The pusher member, which has been directly pushed, gets over the flexible part so that the pusher member reaches the push-in position.

  According to the chemical injection device having the structure according to this aspect, since the flexible portion that can be bent and deformed is provided at the proximal end portion of the needle tip cover, the flexible portion is pushed and deformed. The overpass operation of the proximal end portion of the needle tip cover by the distal end portion of the child member can be stably realized.

  According to an eighth aspect of the present invention, in the chemical liquid injector according to any one of the first to seventh aspects, a flexible piece that can be bent and deformed is provided at a distal end portion of the pusher member. The pusher member reaches the push-in position when the flexible piece of the pusher member that is directly pushed over the base end of the needle tip cover.

  According to the chemical liquid injector configured in accordance with this aspect, the flexible piece is bent and deformed, so that the overpass operation of the proximal end portion of the needle tip cover by the distal end portion of the pusher member can be stably realized.

  According to a ninth aspect of the present invention, in the chemical liquid injector according to any one of the first to eighth aspects, a mutual interference portion is provided between the distal end portion of the pusher member and the proximal end portion of the needle tip cover. In the state where the needle tip cover moves to the proximal end side with respect to the apparatus main body and the needle tip of the hollow needle is exposed, the mutual interference portions overlap each other so that the pusher member While the movement toward the distal end side with respect to the apparatus main body is allowed, the needle tip cover protrudes from the apparatus main body toward the distal end side in a state where the pusher member is positioned at the pushing position with respect to the apparatus main body. Thus, the mutual interference portion is canceled, and the movement of the needle tip cover toward the proximal end side is restricted by the mutual abutting action of the mutual interference portion.

  According to the chemical injection device structured according to this aspect, the mutual movement due to the overlap of the needle tip cover and the pusher member is allowed in one direction, so that the pushing operation of the pusher member and the tip side of the needle tip cover And the movement of the protruding needle tip cover to the proximal end side is restricted.

  According to a tenth aspect of the present invention, the drug solution stored in the internal reservoir is dispensed through the hollow needle by pushing the pusher member from the base end side into the apparatus body having the hollow needle on the distal end side. In the liquid injector, a vial having a bottle and a stopper is adopted as the internal reservoir, the stopper is positioned with respect to the apparatus main body, and the bottle is accompanied by a pushing operation of the pusher member. The drug solution in the vial is poured out through the hollow needle penetrated through the stopper.

  According to the drug solution injection device structured according to this aspect, it is possible to attach a vial containing a drug solution, and the operability can be greatly improved as compared with, for example, a syringe having a conventional structure.

  The eleventh aspect of the present invention is assembled so that it can move in the axial direction from the base end side of the apparatus main body having a hollow needle on the distal end side, and is stored in the internal reservoir by being pushed into the apparatus main body. A pusher member for a chemical solution injection device for pouring out the prepared chemical solution through the hollow needle, the vial constituting the internal reservoir being attached, holding the vial body of the vial, Then, the bottle body is moved with respect to the stopper body of the vial positioned by the apparatus main body by moving it toward the distal end side.

  According to the pusher member for the chemical solution injection device structured according to this aspect, since the vial containing the chemical solution is mounted, the pusher member is assembled and used in the device main body, thereby containing the chemical solution. Work becomes unnecessary. It is also possible to prepare a plurality of vials containing different types of chemical solutions, or to prepare a plurality of types of pusher members on which various types of vials are mounted in advance, and provide them to the user as appropriate.

  According to the chemical injection device having the structure according to the inventions according to claims 1 to 9, the proximal end of the needle tip cover that protects the needle tip of the hollow needle by contact with the pusher member pushed into the distal end side. A chemical injection device having a novel structure can be provided in which re-exposure of the needle tip due to lateral movement is prevented.

  Moreover, according to the chemical injection device constructed according to the inventions of claims 10 and 11, by adopting a vial as the internal reservoir, for example, compared with a case where a conventional syringe is adopted, in the chemical injection device It is possible to improve the operability in use from the storage of the chemical solution to the dispensing.

The top view which shows the chemical | medical solution injection device as the 1st Embodiment of this invention in the state before puncture. II-II sectional drawing in FIG. The cross-sectional view which expands and shows the III-III cross section in FIG. FIG. 2 is a perspective view showing a needle tip cover constituting the chemical liquid injector shown in FIG. 1 in a single product state before being assembled to the apparatus main body. The perspective view from another direction in the needle | hook tip cover shown by FIG. The front view which expands and shows the needle | hook tip cover shown by FIG. VII-VII sectional drawing in FIG. VIII-VIII sectional drawing in FIG. The perspective view which shows the pusher member which comprises the chemical | medical solution injection | pouring apparatus shown by FIG. The perspective view from another direction in the pusher member shown by FIG. The front view which expands and shows the pusher member shown by FIG. XII-XII sectional drawing in FIG. XIII-XIII sectional drawing in FIG. The top view which shows the chemical | medical solution injection apparatus shown by FIG. 1 in the state before use. FIG. 2 is a longitudinal sectional view showing a state in which the pusher member can be rotated around a central axis with respect to the apparatus main body to enable a pushing operation in the chemical liquid injector shown in FIG. 1. The longitudinal cross-sectional view which shows the state which presses against skin and punctures a hollow needle in the chemical | medical solution injection apparatus shown by FIG. The longitudinal cross-sectional view which shows the state in the middle of pushing operation of a pusher member in the chemical | medical solution injection apparatus shown by FIG. The longitudinal cross-sectional view which shows the state which further pushed in the pusher member in the chemical | medical solution injection | pouring apparatus shown by FIG. 17, and reached | attained the pushing position. The longitudinal cross-sectional view which shows the state which rotated the chemical | medical solution injection apparatus shown by FIG. 18 only the predetermined angle around the central axis. The top view which shows the state which the needle-tip cover has moved to the front end side and protected the needle-point of a hollow needle in the chemical injection device shown in FIG. XXI-XXI sectional drawing in FIG. XXII-XXII sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the chemical | medical solution injection device as 2nd Embodiment in this invention in the state before puncture, Comprising: The figure corresponding to FIG. It is a longitudinal cross-sectional view which shows the chemical | medical solution injection device shown by FIG. 23 in a puncture state, Comprising: The figure corresponding to FIG. FIG. 24 is a longitudinal sectional view showing the chemical liquid injector shown in FIG. 23 in a needle tip protection state, corresponding to FIG. 22. The perspective view which shows the chemical | medical solution injection device as the 3rd Embodiment of this invention in the state before puncture, Comprising: The figure which permeate | transmits and shows an apparatus main body. The front view of the chemical injection device shown in FIG. The perspective view shown in the state which punctured the hollow needle and pushed in the pusher member in the chemical | medical solution injection apparatus shown by FIG. The perspective view which shows the chemical | medical solution injection device shown by FIG. 26 in a needle tip protection state.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 to 3 show a chemical solution injection device 10 as a first embodiment of the present invention in a state before puncture with a cap 114 (see FIG. 14) described later removed. The chemical injection device 10 includes an apparatus main body 14 to which the hollow needle 12 is fixed, a needle tip cover 16 provided on the distal end side of the apparatus main body 14, and a pusher member 18 provided on the proximal end side of the apparatus main body 14. It is comprised including. In this embodiment, a vial 20 as an internal reservoir is attached to the pusher member 18, and the vial 20 is obtained by puncturing the hollow needle 12 into the skin and pushing the pusher member 18 from the proximal end side. The medical solution stored inside is injected into the body through the hollow needle 12 (poured out of the vial 20), and the hollow needle 12 is removed from the skin, so that the distal needle as the needle tip of the hollow needle 12 after puncture The tip 22 is protected by a needle tip cover 16 that protrudes from the apparatus main body 14 toward the distal end side. In the following description, the axial direction refers to the left-right direction in FIG. 1 that is the central axial direction of each member constituting the chemical liquid injector 10. Further, the distal end side refers to the left side in FIG. 1 that is the side that is punctured into the skin in the liquid injector 10, while the proximal end refers to the side that performs the pushing operation of the pusher member 18 in the liquid injector 10. The right side in FIG.

  More specifically, the hollow needle 12 of the present embodiment is a double-ended needle, and has a sharp distal tip side needle tip 22 and a proximal end side needle tip 24 at both axial ends. A generally cylindrical needle hub 26 is externally attached to the axially intermediate portion of the hollow needle 12 and is fixed with an adhesive or the like as necessary. A male screw portion 28 is formed on the outer peripheral surface of the proximal end side of the needle hub 26.

  The needle hub 26 to which the hollow needle 12 is fixed is assembled to the apparatus main body 14 that has a substantially cylindrical shape as a whole. In the present embodiment, the apparatus main body 14 has a substantially double cylindrical structure extending in the axial direction, and includes an inner peripheral wall portion 30 and an outer peripheral wall portion 32 that are positioned in an internal / external insertion state. The inner peripheral wall portion 30 and the outer peripheral wall portion 32 both extend substantially straight in the axial direction. In addition, the outer peripheral wall portion 32 has a larger axial dimension than the inner peripheral wall portion 30, and both axial sides of the outer peripheral wall portion 32 protrude outward in the axial direction from the inner peripheral wall portion 30.

  Further, the inner peripheral wall portion 30 and the outer peripheral wall portion 32 are connected to each other by a connecting plate portion 34 extending in a direction perpendicular to the axis at each axial intermediate portion. In the present embodiment, four such connecting plate portions 34 are provided at substantially equal intervals in the circumferential direction, and the pair of connecting plate portions 34a, 34a are on both sides in one radial direction (both sides in the vertical direction in FIG. 3). And another pair of connecting plate portions 34b, 34b are provided on both sides in the direction perpendicular to the connecting plate portions 34a, 34a (both sides in the left-right direction in FIG. 3). In particular, in this embodiment, the circumferential width dimension of the pair of connecting plate portions 34a, 34a is larger than the circumferential width dimension of the other pair of connecting plate portions 34b, 34b.

  Furthermore, in the inner peripheral wall portion 30, the distal end side from the connecting plate portion 34 is a mounting tube portion 36 that is thicker than the connecting plate portion 34 in the base end side. A female screw portion 38 is formed on the inner peripheral surface of the mounting cylinder portion 36. On the other hand, a fixed cylinder portion 40 having a small inner diameter is provided at the proximal end portion of the inner peripheral wall portion 30. The inner diameter dimension of the fixed cylinder portion 40 is substantially equal to or slightly larger than the outer diameter dimension of the hollow needle 12.

  Then, the proximal end portion of the needle hub 26 is inserted into the attachment tube portion 36 on the distal end side of the inner peripheral wall portion 30, and the male screw portion 28 and the female screw portion 38 are screwed together. It is indirectly fixed to the apparatus main body 14 via the hub 26. The hollow needle 12 may be directly fixed to the apparatus main body 14 without using the needle hub 26. The hollow needle 12 is inserted into the inner peripheral wall portion 30, and the tip side needle tip 22 of the hollow needle 12 protrudes to the tip side from the inner peripheral wall portion 30 and the outer peripheral wall portion 32. The proximal end needle tip 24 protrudes to the proximal end side from the inner peripheral wall portion 30 and protrudes with a length that does not reach the proximal end of the outer peripheral wall portion 32. That is, the distal needle tip 22 of the hollow needle 12 protrudes axially outward from the distal end of the apparatus main body 14, and the proximal needle tip 24 is positioned inside the apparatus main body 14. The outer peripheral surface of the proximal end portion of the hollow needle 12 may be fixed to the inner peripheral surface of the proximal end portion (fixed cylinder portion 40) of the inner peripheral wall portion 30 with an adhesive or the like.

  On the other hand, on the outer peripheral surface of the outer peripheral wall portion 32 of the apparatus main body 14, an annular cap engaging portion 42 to which a cap 114 described later is engaged is continuously provided over the entire circumference in the circumferential direction. Is provided. Further, on the inner peripheral surface of the outer peripheral wall portion 32, a tip end side claw portion 44 (see FIG. 19) that protrudes to the inner periphery side is provided at the tip end portion. In the present embodiment, four tip side claw portions 44 are formed at substantially equal intervals in the circumferential direction.

  Further, at the base end side end portion of the outer peripheral wall portion 32, a through window 46 that penetrates the outer peripheral wall portion 32 in the thickness direction, and an elastic piece that can be elastically deformed in the thickness direction with respect to the outer peripheral wall portion 32. 48. In the present embodiment, four through windows 46 and four elastic pieces 48 are formed at substantially equal intervals (approximately every 90 degrees) in the circumferential direction. In particular, in the present embodiment, the through windows 46 and the elastic pieces 48 are elastic. The pieces 48 are alternately formed at intervals of 45 degrees in the circumferential direction.

  The through window 46 has a substantially rectangular shape in which the axial dimension is larger than the circumferential width dimension. On the other hand, at the formation position of the elastic piece 48 on the outer peripheral wall portion 32, a substantially rectangular opening window 50 in which the circumferential width dimension and the axial dimension are substantially equal or the circumferential width dimension is slightly larger. Is formed. An elastic piece 48 protrudes from the inner surface on the distal end side of the opening window 50 toward the proximal end side, and the elastic piece 48 is separated from three sides except for the distal end side on the inner surface of the opening window 50. Thereby, the elastic piece 48 can be elastically deformed in the thickness direction of the outer peripheral wall portion 32. In the elastic piece 48, a proximal end claw portion 52 that protrudes toward the inner peripheral side is formed at the protruding distal end (axially proximal end).

  In addition, on the inner peripheral surface of the outer peripheral wall portion 32, an overpass projection 54 that protrudes toward the inner peripheral side is formed on the axially intermediate portion, specifically, on the base end side of the connecting plate portion 34. In the present embodiment, four overpass projections 54 are provided on the circumference, and these four overpass projections 54 are provided at substantially equal intervals (approximately every 90 degrees) in the circumferential direction. These overpass projections 54 are provided at positions substantially corresponding to restriction projections 70 and 70 in the needle tip cover 16 described later, and in this embodiment, a pair of left and right directions in FIG. The overpass projections 54, 54 oppose each other at a predetermined distance in the circumferential direction. In addition, the distance between the circumferential directions of the overpass projections 54 and 54 facing in the circumferential direction on one side in the left and right direction in FIG. 3 is made larger than the circumferential width dimension of the connecting plate portions 34b and 34b in the apparatus main body 14. Furthermore, the inner peripheral surface of the overpass protrusion 54 is a tapered surface 56 that is inclined in a direction in which the protruding dimension of the overpass protrusion 54 decreases toward the base end side.

  A needle tip cover 16 as shown in FIGS. 4 to 8 is assembled to the distal end side of the apparatus main body 14 having such a structure so as to be movable in the axial direction. The needle tip cover 16 has a substantially cylindrical shape as a whole and includes a peripheral wall 58 extending in the circumferential direction. The outer diameter of the peripheral wall 58 is substantially equal to or slightly smaller than the inner diameter of the outer peripheral wall portion 32 of the apparatus main body 14. And the contact protrusion 60 which protrudes to the outer peripheral side is formed in the front-end | tip of this surrounding wall 58 over substantially the perimeter of the circumferential direction.

  Further, an engagement groove 62 having a predetermined axial dimension is formed on the outer peripheral surface of the distal end portion of the peripheral wall 58 so as to open to the outer peripheral side. The engagement grooves 62 are formed at positions corresponding to the front end side claw portions 44 of the apparatus main body 14 on the circumference, and in the present embodiment, the four engagement grooves 62 are arranged at substantially equal intervals (substantially about the circumference). Formed every 90 degrees). These engagement grooves 62 extend to the substantially axial center portion of the peripheral wall 58. Furthermore, an engagement claw 64 protruding to the outer peripheral side is provided at the proximal end of the engagement groove 62. The base end side surface of the engagement claw 64 is an inclined surface 66 in which the projecting dimension of the engagement claw 64 gradually decreases toward the base end side, and the engagement groove 62 including the engagement claw 64 is formed. The base end portion can be elastically deformed in the thickness direction of the peripheral wall 58. Thereby, the assembly of the needle tip cover 16 to the apparatus main body 14 is facilitated.

  Furthermore, a notch 68 that opens to the proximal end side and penetrates in the thickness direction of the circumferential wall 58 is formed at the proximal end of the circumferential wall 58 with a predetermined axial dimension. In the present embodiment, it extends from the base end of the peripheral wall 58 to the substantially central portion in the axial direction. Further, in the present embodiment, four notches 68 are formed in the circumferential direction at substantially equal intervals (approximately every 90 degrees) in the circumferential direction, and correspond to the connecting plate portion 34 in the apparatus main body 14 on the circumference. . In particular, in the present embodiment, these notches 68 are provided at positions away from the engaging grooves 62 in the circumferential direction, and the notches 68 and the engaging grooves 62 are formed when the needle tip cover 16 is viewed in the axial direction. They are provided alternately at intervals of approximately 45 degrees in the circumferential direction. That is, a pair of notches 68a and 68a are formed to face each other in the vertical direction in FIG. 3, and another pair of notches 68b and 68b are formed to face each other in the left and right direction in FIG. Has been. In particular, in the present embodiment, the circumferential width dimension of the notch 68b is larger than the circumferential width dimension of the notch 68a. Specifically, the circumferential width dimension of the notch 68a is substantially equal to or slightly larger than the circumferential width dimension of the connecting plate portion 34a provided at a corresponding position in the apparatus main body 14.

  Here, from the peripheral wall 58 in the base end side opening part of the notch 68b, a pair of regulating protrusions 70 as mutual interference parts projecting inwardly of the notch 68b are provided facing each other in the circumferential direction. These regulating projections 70 and 70 are opposed to each other with a predetermined circumferential separation distance without contacting each other, and the circumferential separation distance of the regulating projections 70 and 70 is at a corresponding position in the apparatus main body 14. It is made larger than the circumferential width dimension of the provided connecting plate part 34b. The inner peripheral surfaces of the restricting protrusions 70 are inclined surfaces 72 that are inclined in the direction in which the thickness dimension of the restricting protrusions 70 gradually increases toward the base end side. The end surface on the end side is a vertical surface 73 extending in the direction perpendicular to the axis.

  In addition, an annular holding wall portion 74 that protrudes toward the inner peripheral side is provided on the inner peripheral surface of the axially intermediate portion of the peripheral wall 58, and a proximal end is provided on the inner peripheral edge portion of the holding wall portion 74. An insertion tube portion 76 protruding to the side is provided. In this embodiment, the inner diameter dimension of the holding wall portion 74 is larger than the outer diameter dimension of the needle hub 26 attached to the tip of the apparatus main body 14. In the present embodiment, the reinforcing rib 78 is provided on the inner peripheral surface of the peripheral wall 58 from the tip of the peripheral wall 58 to the holding wall portion 74. In particular, in the present embodiment, four reinforcing ribs 78 are provided on the periphery, and the deformation rigidity of the peripheral wall 58 is increased.

  On the other hand, a pusher member 18 as shown in FIGS. 9 to 13 is assembled to the base end side of the apparatus main body 14 so as to be movable in the axial direction. The pusher member 18 has a generally bottomed cylindrical shape as a whole, and includes a peripheral wall 80 extending in the circumferential direction and a substantially circular bottom wall portion 81 that closes the proximal end side opening of the peripheral wall 80. . The outer diameter of the peripheral wall 80 is substantially equal to or slightly smaller than the inner diameter of the outer peripheral wall 32 of the apparatus main body 14. In addition, the base end side end surface 81a of the bottom wall portion 81 is a curved surface in which the central portion is positioned on the front end side with respect to the outer peripheral portion, and the user (for example, a medical worker or the patient himself) is the base end side end surface. It is easy to place the finger on 81a and push the pusher member 18 toward the distal end.

  A circumferential groove 82 extending in the circumferential direction with a predetermined circumferential dimension is provided on the outer circumferential surface of the distal end portion of the circumferential wall 80 so as to open to the outer circumferential side, and one circumferential end of the circumferential groove 82 is provided. From the section, an axial groove 84 extending toward the base end side with a predetermined axial dimension is provided on the outer peripheral side. In this embodiment, the circumferential grooves 82 are formed around the circumferential wall 80 with a circumferential dimension of approximately 45 degrees, and the four circumferential grooves 82 are substantially equidistant on the circumference (approximately every 90 degrees). Is provided. That is, as will be described later, the proximal claw portion 52 positioned in the circumferential groove 82 rotates the pusher member 18 about the central axis by 45 degrees with respect to the apparatus main body 14, so that the axial groove 84 To move to.

  An insertion groove 85 extending in the axial direction from the tip of the circumferential wall 80 is provided at the other circumferential end of the circumferential groove 82, and this is required when assembling the apparatus main body 14 and the pusher member 18. The base end side claw portion 52 of the apparatus main body 14 can be inserted into the circumferential groove 82 through the insertion groove 85. In particular, a retaining protrusion 85a is provided between the insertion groove 85 and the circumferential groove 82, specifically, at the proximal end of the insertion groove 85, protruding from the groove bottom surface to the outer peripheral side. The base end side claw portion 52 can move into the circumferential groove 82 by getting over the retaining protrusion 85a. In the present embodiment, the distal end surface of the retaining protrusion 85a is an inclined surface 85b whose projecting dimension gradually decreases toward the distal end side, so that the operation of passing the retaining protrusion 85a by the proximal end claw portion 52 is easy. To be realized.

  Further, a locking projection 86 that protrudes from the groove bottom surface to the outer peripheral side is provided between the circumferential groove 82 and the axial groove 84, specifically, at one circumferential end of the circumferential groove 82. ing. As a result, unless the external force accompanying the rotation operation is exerted on the pusher member 18, the proximal claw portion 52 does not get over the locking projection 86, and the pusher member 18 on the distal end side with respect to the apparatus main body 14. Movement (push-in operation) to is prevented.

  Further, in the base end portion of the axial groove 84, the positioning protrusion 88 protrudes from the groove bottom surface to the outer peripheral side at a position separated from the base end side wall portion of the axial groove 84 toward the front end side by a predetermined axial dimension. ing. Thus, a substantially rectangular positioning recess 90 surrounded by the peripheral wall constituting the axial groove 84 and the positioning projection 88 is formed at the base end of the axial groove 84. As will be described later, The base end side claw portion 52 moved to the base end side through the directional groove 84 gets over the positioning protrusion 88 and enters the positioning recess 90. That is, the proximal end claw portion 52 that has entered the positioning recess 90 abuts against the proximal end wall portion of the axial groove 84 and the positioning projection 88, thereby preventing its axial movement. Unintentional relative movement between the apparatus main body 14 and the pusher member 18 is prevented in a state where the proximal end side claw portion 52 enters the recess 90.

  Further, an arm portion 92 as a mutual interference portion projecting toward the distal end side is provided at the distal end of the peripheral wall 80 in the pusher member 18. The arm portions 92 have a curved plate shape that is substantially rectangular when viewed from the front as a whole, and a pair of arms 92 are provided to face each other on both sides in one radial direction (right and left sides in FIG. 11). Further, each of these arm portions 92 is sufficiently thin to be able to bend and deform in the radial direction (opposing direction). In this embodiment, these arm portions 92 can be elastically deformed. It has become. That is, in the present embodiment, a flexible piece that can be bent and deformed at the distal end portion of the pusher member 18 is constituted by the arm portion 92. In particular, in the present embodiment, an inclined portion 94 that is inclined toward the outer peripheral side is provided at the distal end portion of the arm portion 92, and an external force is applied to the inclined portion 94 from the distal end side. The elastic deformation in the radial direction can be easily generated. The maximum separation distance on the outer surfaces of the arm portions 92, 92 may be substantially equal to or slightly smaller than the inner diameter dimension of the outer peripheral wall portion 32 in the apparatus main body 14, or may be slightly increased to increase the pusher member. The arm 92 may be slightly elastically deformed to the inner peripheral side when the 18 is assembled to the apparatus main body 14. In the present embodiment, the end surface on the tip side of the inclined portion 94 is a vertical surface 95 that extends in the direction perpendicular to the axis.

  Furthermore, on the inner peripheral surface of the peripheral wall 80, a reinforcing rib 96 extending in the axial direction is provided so as to protrude toward the inner peripheral side from the axially intermediate portion of each arm portion 92 to the proximal end of the peripheral wall 80. In other words, the reinforcing ribs 96 are provided so as to face each other in the radial direction (the left-right direction in FIG. 11) that is the opposing direction of the arm portions 92, 92. On the other hand, from the inner peripheral surface of the peripheral wall 80 including the inner peripheral surfaces of the reinforcing ribs 96, a holding projection 98 that holds the vial 20 described later protrudes toward the inner peripheral side. In the present embodiment, the holding projection 98 protrudes from the inner peripheral surface of each reinforcing rib 96 toward the inner peripheral side and faces in the radial direction (left-right direction in FIG. 11), and on the inner peripheral surface of the peripheral wall 80. The holding protrusions 98 are also provided on both sides of the direction perpendicular to the opposing direction of the holding protrusions 98, 98 (the vertical direction in FIG. 11). That is, in this embodiment, the four holding protrusions 98 are provided at substantially equal intervals (approximately every 90 degrees) in the circumferential direction. The distance between the opposing surfaces of the opposing holding projections 98, 98 is substantially equal to or slightly larger than the outer diameter of the vial 20 described later, and the vial 20 is mounted without being inclined with respect to the pusher member 18. It has come to be.

  On the other hand, on the outer peripheral surface of the pusher member 18, a positioning piece 100 that protrudes to the outer peripheral side is provided at the proximal end portion of the peripheral wall 80. In the present embodiment, the distal end side surface of the positioning piece 100 is an inclined surface 102 in which the protruding dimension of the positioning piece 100 gradually decreases toward the distal end side, and the positioning piece 100 has a substantially right-angled triangular longitudinal section. have. In the present embodiment, the four positioning pieces 100 are formed at substantially equal intervals (approximately every 90 degrees) in the circumferential direction, and the positioning pieces 100 are positioned between the circumferential directions of the axial grooves 84. Yes. Therefore, in the present embodiment, the circumferential groove 82 and the insertion groove 85 are located on the distal end side of the positioning piece 100 on the outer circumferential surface of the pusher member 18, and the shaft is disposed on the distal end side of the axial groove 84. The arm portion 92 is located across the tip side wall portion 101 of the directional groove 84. That is, a gap 101 a that opens to the outer peripheral side is formed between the tip side wall portion 101 and the inclined portion 94 that is inclined to the outer peripheral side at the tip of the arm portion 92. Further, these positioning pieces 100 are not connected to the peripheral wall 80 or the bottom wall portion 81 on the three sides (base end side and both sides in the circumferential direction), that is, are connected to the peripheral wall 80 only at the distal end side. Elastic deformation is possible in the thickness direction (radial direction) of 80.

  The needle hub 26, the apparatus main body 14, the needle tip cover 16, and the pusher member 18 as described above are preferably formed of, for example, hard synthetic resin. The hollow needle 12 is preferably formed of a metal such as stainless steel.

  Inside the pusher member 18 having the above-described structure, a vial 20 for storing a chemical solution is mounted as an internal reservoir. The vial 20 includes a substantially bottomed cylindrical bottle body 104 that opens to the distal end side, and a plug body 106 that closes the distal end side opening of the bottle body 104. The material of the bottle body 104 is not limited at all, and for example, glass, hard synthetic resin, or the like can be suitably used. Moreover, it is suitable for the plug body 106 to be comprised with elastic bodies, such as rubber | gum. A slit 108 penetrating in the axial direction is formed at the center of the plug body 106, and the plug body 106 is inserted and attached to the opening on the distal end side of the bottle body 104. The slit 108 is closed by being compressed from the side, so that the chemical liquid sealed in the vial 20 does not leak out. The slit 108 is not essential. Moreover, the chemical | medical solution stored inside the vial 20 is not limited at all, and a desired chemical | medical solution may be employ | adopted suitably.

  The vial body 104 of the vial 20 is held by the pusher member 18 while the portion constituting the peripheral wall and the bottom wall portion 81 of the pusher member 18 are substantially in contact with each other. It is held by the protrusion 98 without being inclined substantially in the axial direction.

  The needle body cover 16 is assembled to the distal end side so as to be movable in the axial direction with respect to the apparatus main body 14 to which the hollow needle 12 is fixed as described above, and the vial 20 is placed in the proximal end side so as to be movable in the axial direction. The pusher member 18 provided is assembled.

  That is, the needle tip cover 16 is assembled to the device main body 14 by being inserted from the distal end side opening 109, and the engagement groove 62 provided on the outer peripheral surface of the needle tip cover 16 is inserted into the engagement groove 62 of the device main body 14. The front end side claw portion 44 is inserted and positioned in the circumferential direction. In this circumferential positioning state, the connecting plate portions 34a and 34b of the apparatus main body 14 and the notches 68a and 68b of the needle tip cover 16 are aligned with each other in the circumferential direction, and the needle tip cover 16 is aligned with the apparatus main body 14. The connecting plate portions 34a and 34a can move in the notches 68a and 68a in the axial direction when moved to the base end side, and the connecting plate portions 34b and 34b are notched. 68b, 68b can be moved in the axial direction. Since the base end portion of the engagement groove 62 including the engagement claw 64 can be elastically deformed in the radial direction when the distal claw portion 44 is inserted into the engagement groove 62, the engagement groove 62 The engagement claw 64 can be easily inserted into the.

  The tip claw 44 moves in the engagement groove 62 in the axial direction, so that the needle tip cover 16 can move without rotating or tilting with respect to the apparatus main body 14. The movement of the needle tip cover 16 in the axial direction is caused by the end of the tip end of the apparatus main body 14 and the contact protrusion 60 of the needle tip cover 16 abutting each other, the connecting plate portion 34 a of the apparatus main body 14, The movement of the needle tip cover 16 toward the proximal end side is prevented by contacting the inner surface of the tip end side of the notches 68 a and 68 b in the needle tip cover 16, and the distal end side of the apparatus main body 14. The claw portion 44 and the engagement claw 64 of the needle tip cover 16 are in contact with each other, so that the movement of the needle tip cover 16 toward the distal end side is prevented.

  In the present embodiment, a coil spring 110 as an elastic member is interposed between the apparatus main body 14 and the needle tip cover 16 in the axial direction. Specifically, the distal end portion of the coil spring 110 is externally inserted into the insertion tube portion 76 of the needle tip cover 16 and abuts against the holding wall portion 74 and is fixed with an adhesive or the like as necessary. Yes. On the other hand, the base end portion of the coil spring 110 is extrapolated to the mounting cylinder portion 36 of the apparatus main body 14, abuts against the connecting plate portion 34, and is fixed with an adhesive or the like as necessary. In the state before puncturing shown in FIGS. 1 to 3, the coil spring 110 has a substantially natural length or is slightly compressed in the axial direction, and is arranged with respect to the needle tip cover 16. An urging force in the direction of the tip may be exerted. In the state before puncturing, the tip side needle tip 22 of the hollow needle 12 protruding from the apparatus main body 14 is covered and protected by the needle tip cover 16.

  On the other hand, the vial 20 filled with a chemical solution in advance is inserted and attached through the distal end side opening of the pusher member 18, and the pusher member 18 attached with the vial 20 is attached to the proximal end side of the apparatus main body 14. Are assembled. That is, the proximal end side claw portion 52 provided in the proximal end portion of the apparatus main body 14 is inserted into the circumferential groove 82 through the insertion groove 85 provided in the outer peripheral surface of the pusher member 18. The child member 18 and the apparatus main body 14 are positioned with respect to each other in the circumferential direction. In the state before the puncture shown in FIGS. 1 to 3, the proximal end side claw portion 52, the proximal end side wall portion constituting the retaining projection 85 a and the circumferential groove 82 provided at the proximal end of the insertion groove 85. 111 is prevented from moving in the axial direction of the pusher member 18 with respect to the apparatus main body 14 (for example, pushing operation of the pusher member 18), and the circumferential direction of the proximal claw portion 52 and the circumferential groove 82 is prevented. Unintentional relative rotation between the apparatus main body 14 and the pusher member 18 is prevented by abutment with a locking projection 86 provided at one end. That is, in the present embodiment, the lock fixing mechanism 112 that disables the pushing operation of the pusher member 18 with respect to the apparatus main body 14 is arranged between the base end side claw portion 52 and the circumferential direction between the apparatus main body 14 and the pusher member 18. The base end side wall 111 of the groove 82 is included.

  In such a state before puncturing, the pusher member 18 is inserted from the proximal end side opening 113 of the apparatus main body 14, the proximal end portion of the pusher member 18 protrudes from the proximal end of the apparatus main body 14, and the apparatus main body. The proximal end portion (fixed cylinder portion 40) of the inner peripheral wall portion 14 of 14 is inserted into the distal end portion of the peripheral wall 80 of the pusher member 18. In this state, in this embodiment, the proximal end needle tip 24 of the hollow needle 12 is positioned on the distal end side of the stopper body 106 in the vial 20, but the proximal end needle tip 24 is the slit 108 of the stopper body 106. For example, the plug body 106 may be positioned at an intermediate portion in the axial direction or may penetrate the plug body 106.

  The usage method of the above chemical | medical solution injection apparatus 10 is demonstrated and shown below FIGS.

  First, FIG. 14 shows a state before the use of the chemical liquid injector 10, that is, a state that is sold and actually available to the user. In such a state, the cap 114 is externally attached to the distal end portion of the chemical liquid injector 10, that is, the distal end portion of the needle tip cover 16 and the apparatus main body 14. Although the specific shape of this cap 114 is not limited at all, in this embodiment, it is made into the substantially bottomed cylindrical shape opened to a base end side.

  That is, the cap 114 includes a substantially circular distal end wall portion 115a and a cylindrical wall portion 115b protruding from the outer peripheral end portion of the distal end wall portion 115a toward the proximal end side. Further, on the inner peripheral side of the cylindrical wall portion 115b, an abutting cylindrical portion 115c protruding from the distal end wall portion 115a to the proximal end side is provided, and the needle tip cover 16 and the distal end portion of the apparatus main body 14 are disposed. When the cap 114 is extrapolated, the tip portion of the outer peripheral wall portion 32 of the needle tip cover 16 and the apparatus main body 14 is inserted between the radial direction of the cylindrical wall portion 115b and the contact cylindrical portion 115c, and The outer peripheral side of the distal end side needle tip 22 of the hollow needle 12 is covered with a contact cylinder portion 115c. In particular, in this embodiment, in such a mounted state, the cap locking portion 42 provided at the tip of the outer peripheral wall portion 32 contacts the inner peripheral surface of the cylindrical wall portion 115b and the protruding tip of the abutting cylindrical portion 115c. (Axial direction proximal end) is in contact with the distal end of the needle hub 26, thereby preventing the cap 114 from moving toward the proximal end side with respect to the apparatus main body 14.

  In this state, the needle tip cover 16 is not in contact with the cap 114 or is zero-touched, so that an external force from the cap 114 is not exerted on the needle tip cover 16. That is, the needle tip cover 16 is prevented from unintentionally moving to the proximal end side with respect to the apparatus main body 14 in a state before the chemical liquid injector 10 is used.

  The cap 114 is prevented from moving toward the base end side with respect to the apparatus main body 14 because the cap locking portion 42 of the outer peripheral wall portion 32 contacts the inner peripheral surface of the cylindrical wall portion 115b of the cap 114, and It may be achieved by any one of the projecting tip of the contact cylindrical portion 115c contacting the needle hub 26. That is, for example, in the cap 114, the contact cylinder portion 115c may not be provided. Further, for example, the inner peripheral surface of the cap 114 (the inner peripheral surface of the cylindrical wall portion 115 b) may be provided with a convex portion protruding toward the inner peripheral side, and the convex portion is provided at the tip of the outer peripheral wall portion 32. The cap 114 may be prevented from being unintentionally detached from the chemical liquid injector 10 by engaging with the cap locking portion 42 provided.

  And the chemical | medical solution injection device 10 is made into the state before the puncture shown by FIGS. 1-3 by removing the cap 114 from this state. Further, FIG. 15 shows a state in which the pusher member 18 is rotated by a predetermined angle around the central axis with respect to the apparatus main body 14 from such a state. That is, by rotating the pusher member 18 by a predetermined angle around the central axis with respect to the apparatus main body 14, the base end side claw portion 52 of the apparatus main body 14 located in the circumferential groove 82 is engaged with the locking protrusion. 86 is moved over into the axial groove 84. Thereby, the pusher member 18 that has been made immovable in the axial direction with respect to the apparatus main body 14 by coming into contact with the wall portion on the distal end side of the circumferential groove 82 (prevention protruding portion 85a) and the proximal end side wall portion 111, It is possible to move to the front end side with respect to the apparatus main body 14. In short, in the state shown in FIGS. 1 to 3, the lock fixing mechanism 112 has made it impossible to push the pusher member 18 into the apparatus main body 14, but the apparatus main body 14 and the pusher member 18 are moved in the circumferential direction ( By the relative rotation (around the central axis), the lock by the lock fixing mechanism 112 is released, and the pushing operation of the pusher member 18 with respect to the apparatus main body 14 is allowed.

  In the present embodiment, by rotating the pusher member 18 by 45 degrees around the central axis with respect to the apparatus main body 14, the proximal end side claw portion 52 moves from the circumferential groove 82 to the axial groove 84, and the pusher is moved. The member 18 can move in the axial direction with respect to the apparatus main body 14. Then, the pusher member 18 is rotated by a predetermined angle (45 degrees in the present embodiment) around the central axis with respect to the apparatus main body 14 in this way, so that the overpass collision provided on the outer peripheral wall portion 32 in the apparatus main body 14 is performed. The portion 54 and the arm portion 92 provided on the pusher member 18 are aligned with each other in the circumferential direction (that is, the overpass projection 54 is located on the distal end side of the arm portion 92). In such a state, the through window 46 in the apparatus main body 14 and the positioning piece 100 in the pusher member 18 are aligned with each other in the circumferential direction (that is, the through window 46 is located on the distal end side of the positioning piece 100). )

  Further, the distal end side of the drug solution injector 10 in such a state is pressed against the patient's skin. Accordingly, as shown in FIG. 16, the needle tip cover 16 is pushed into the inside of the apparatus main body 14, that is, the proximal end side against the urging force of the coil spring 110, and protrudes from the tip of the needle tip cover 16. The exposed tip 22 of the hollow needle 12 is punctured into the patient's skin. The movement of the needle tip cover 16 toward the proximal end with respect to the apparatus main body 14 is guided by the movement of the connecting plate portions 34a and 34b of the apparatus main body 14 in the notches 68a and 68b of the needle tip cover 16. It has become. Note that the movement of the needle tip cover 16 toward the base end side with respect to the apparatus main body 14 is such that the connecting plate portions 34a and 34b come into contact with the front end surface of the inner surfaces of the notches 68a and 68b, or Can be regulated by contacting the contact protrusion 60 of the needle tip cover 16. In such a state that the needle tip cover 16 is most accommodated with respect to the apparatus main body 14 (a state in which the movement of the needle tip cover 16 toward the proximal end side is restricted), the base of the needle tip cover 16 is set. The restricting protrusion 70 provided at the end and the overpass protrusion 54 provided on the inner peripheral surface of the axially intermediate portion of the apparatus main body 14 are substantially adjacent to each other in the axial direction. The inclined surface 72 that is the peripheral surface and the tapered surface 56 that is the inner peripheral surface of the overpass projection 54 are substantially continuous in the axial direction. In addition, since the coil spring 110 is compressed by moving the needle tip cover 16 toward the base end side with respect to the apparatus main body 14, in this state, the elastic force of the coil spring 110 with respect to the needle tip cover 16. A biasing force toward the distal end side of the apparatus main body 14 is exerted with the restoring action.

  Then, from the state where the distal end needle tip 22 of the hollow needle 12 is punctured into the patient's skin as described above, the pusher member 18 is pushed directly into the distal end side with respect to the apparatus main body 14 as shown in FIG. (For example, a finger is pressed against the proximal end surface 81a of the pusher member 18 to perform a direct pushing operation), whereby the bottle body 104 and the stopper body 106 both move to the distal end side, and the distal end portion of the vial 20 The proximal end needle tip 24 of the hollow needle 12 is inserted into the slit 108 of the plug body 106 provided on the plug body 106 and penetrated. As a result, the inside of the vial 20 and the patient's blood vessel communicate with each other via the hollow needle 12. In such a state, the plug body 106 abuts on the proximal end portion (fixed cylinder portion 40) of the inner peripheral wall portion 30 and cannot be moved further to the distal end side, that is, the plug body 106 is not allowed to move to the inner peripheral wall portion 30. It is positioned in the axial direction with respect to (device main body 14). Further, by pushing the pusher member 18 further toward the distal end side with respect to the apparatus main body 14 from such a state, the bottle body 104 moves toward the distal end side with respect to the stopper body 106, in other words, the inside of the bottle body 104. Since the stopper 106 moves toward the proximal end, the volume in the vial 20 is reduced, and the drug solution stored in the vial 20 is injected into the patient's blood vessel through the hollow needle 12 (poured out of the vial 20). ).

  Further, by pushing the pusher member 18 toward the front end side with respect to the apparatus main body 14 in this way, the arm portion 92 provided at the front end of the pusher member 18 contacts the overpass projection 54 provided in the apparatus main body 14. In contact with each other, the arm portion 92 is elastically deformed to the inner peripheral side in accordance with the guiding action of the tapered surface 56 which is the inner peripheral surface of the ride-over protrusion 54. In the present embodiment, the elastic deformation is easily caused by making the arm portion 92 sufficiently thin.

  18 and 19, when the pusher member 18 is pushed to the deepest portion (push position) with respect to the apparatus main body 14, the base end side moves to the base end side in the axial groove 84. The claw portion 52 gets over the positioning protrusion 88 and is positioned in the positioning recess 90. In particular, since the base end side claw portion 52 is provided at the protruding tip of the elastic piece 48, the overpass operation of the positioning protrusion 88 by the base end side claw portion 52 is more easily realized. Yes. In this state, the positioning piece 100 of the pusher member 18 enters the through window 46 of the apparatus main body 14. That is, by pushing the pusher member 18 toward the distal end side with respect to the apparatus main body 14, the inclined surface 102 of the positioning piece 100 and the peripheral edge portion of the proximal end side opening 113 of the apparatus main body 14 are brought into contact with each other. According to the inclined surface 102, the positioning piece 100 is elastically deformed to the inner peripheral side, and the positioning piece 100 gets over the peripheral wall (outer peripheral wall portion 32) on the proximal end side of the through window 46, whereby the positioning piece 100 is elastically deformed. It is restored and deformed to enter the through window 46. Accordingly, the proximal end of the pusher member 18 with respect to the apparatus main body 14 by the mutual contact between the proximal end claw portion 52 and the positioning projection 88 and the mutual contact between the positioning piece 100 and the proximal end inner surface of the through window 46. Is prevented from moving to the side (the direction opposite to the pushing direction), and the pusher member 18 is brought into contact with the inclined surface 102 of the positioning piece 100 and the inner peripheral side end of the inner surface on the front end side of the through window 46. Thus, movement toward the tip side (in the pushing direction) with respect to the apparatus main body 14 is prevented. Thereby, the pusher member 18 can be positioned in the axial direction with respect to the apparatus main body 14.

  Therefore, in the present embodiment, the positioning mechanism 116 that positions the pusher member 18 at the position where the pusher member 18 is pushed into the apparatus main body 14 includes the proximal end claw portion 52 and the positioning protrusion between the pusher member 18 and the apparatus main body 14. 88 and the fitting of the positioning piece 100 to the through-window 46. The engagement between the base end side claw portion 52 and the positioning projection 88 and the fitting of the positioning piece 100 to the through window 46 are both realized in the apparatus main body 14. Such a positioning mechanism 116 cannot be released from the outside, and has a structure that does not include release operation means. Therefore, in the present embodiment, the pusher member 18 that has been pushed into the push-in position and moved to the proximal end side cannot be reused again, and the positioning mechanism 116 of the present embodiment can be reused. The prevention mechanism 118 is included. In particular, in this embodiment, at the pushing position, the proximal end of the pusher member 18 is substantially the same axial position as the proximal end opening 113 of the apparatus main body 14 or slightly inward in the axial direction. For example, an operation such as grasping the pusher member 18 and forcibly pulling it out to the proximal end side is impossible.

  Further, in the process in which the pusher member 18 reaches the push-in position, the arm portion 92 of the pusher member 18 gets over the overpass projection 54 of the apparatus main body 14 and the regulation projection 70 of the needle tip cover 16 from the inner peripheral side. After getting over, the arm portion 92 is elastically restored and deformed so as to be positioned in the notch 68b of the needle tip cover 16. That is, in other words, in the state where the pusher member 18 is in the pushed-in position, the ride-over protrusion 54 and the restriction protrusion 70 are positioned in the gap 101 a on the outer peripheral side of the arm portion 92. The overpassing operation of the overpass projection 54 and the regulation projection 70 of the arm 92 can be easily realized because the inner peripheral surfaces thereof are the tapered surface 56 and the inclined surface 72, respectively. Then, the tip of the inclined portion 94 of the arm portion 92 elastically deformed to the outer peripheral side in the notch 68b of the needle tip cover 16 abuts on the inner peripheral surface of the outer peripheral wall portion 32 of the apparatus main body 14 or slightly. Separated. In this state, as shown in FIG. 19 in particular, the portions other than the formation position of the arm portion 92 in the peripheral wall 80 of the pusher member 18 are the formation positions of the notches 68a and 68b in the peripheral wall 58 of the needle tip cover 16. It is made to substantially contact with the other parts.

  In this way, the needle tip 22 of the hollow needle 12 is punctured into the skin, the pusher member 18 is pushed to the push-in position to inject the chemical solution, and then the hollow needle 12 is removed from the skin. ˜22, the needle tip cover 16 moves so as to protrude from the apparatus main body 14 to the distal end side according to the urging force of the coil spring 110, and the distal end side needle tip 22 of the hollow needle 12 becomes the needle tip cover 16. Covered and protected.

  In other words, the needle tip cover 16 moves to the distal end side with respect to the apparatus main body 14 from the state where the arm portion 92 of the pusher member 18 enters the notch 68b of the needle tip cover 16, so that the needle tip cover 16 is pushed. It is located on the tip side from the member 18. In short, the needle tip cover 16 moves toward the distal end side from the state where the regulation projection 70 of the needle tip cover 16 is positioned in the gap 101a on the outer peripheral side of the arm portion 92, and thus along the inclined surface 72 of the regulation projection 70. The arm portion 92 is elastically deformed to the inner peripheral side, and the restriction protrusion 70 can be detached from the gap 101a. After the arm portion 92 has passed over the restricting projection 70, the arm portion 92 is elastically restored and deformed to the outer peripheral side, and the tip of the inclined portion 94 of the arm portion 92 is the outer peripheral wall portion 32 of the apparatus main body 14. It contacts with the inner peripheral surface of or is slightly separated.

  In such a state, the restricting protrusion 70 of the needle tip cover 16 is substantially adjacent to the inclined portion 94 of the arm portion 92 in the axial direction, and the restricting protrusion 70 and the inclined portion 94 come into contact with each other. Thus, the movement of the needle tip cover 16 toward the base end side with respect to the apparatus main body 14 is restricted or prevented. In particular, in the present embodiment, the base end side end surface of the restricting protrusion 70 and the tip end side end surface of the inclined portion 94 are both vertical surfaces 73 and 95 extending in the direction perpendicular to the axis. The effect of preventing movement to the base end side is stably exhibited. On the other hand, the movement of the needle tip cover 16 toward the distal end side with respect to the apparatus main body 14 is prevented by the mutual contact between the engaging claw 64 of the needle tip cover 16 and the front end claw portion 44 of the apparatus main body 14. The needle tip cover 16 can be prevented from coming off from 14. In short, in this embodiment, the restricting protrusion 70 of the needle tip cover 16 moved to the proximal end side when the hollow needle 12 is punctured and the pusher moved to the distal end side during the pushing operation and positioned at the pushing position. The arm portions 92 of the child member 18 overlap each other, and the needle tip cover 16 is moved to the distal end side when the hollow needle 12 is removed, so that the overlap between the restricting protrusions 70 and the arm portions 92 is eliminated. It is like that. Then, the restriction projection 70 of the needle tip cover 16 and particularly the inclined portion 94 of the arm portion 92 of the pusher member 18 positioned at the push-in position are in contact with each other in the axial direction, whereby the proximal end of the needle tip cover 16 is obtained. The interfering portions provided at the distal end portion of the pusher member 18 and the proximal end portion of the needle tip cover 16 are respectively connected to the arm portion 92, particularly the inclined portion 94, respectively. It is comprised by the control protrusion 70. FIG.

  That is, in the drug solution injection device 10 of the present embodiment, the tip end cover 16 protects the tip side needle tip 22 of the hollow needle 12 by contacting the pusher member 18 positioned at the pushing position by the positioning mechanism 116. Since the movement of the needle tip cover 16 in the state to the proximal end side is restricted or blocked, the unintended movement of the needle tip cover 16 to the proximal end side, i.e., the intention, has a simple structure. The re-exposure of the tip side needle tip 22 of the hollow needle 12 that is not performed can be prevented.

  In particular, in the present embodiment, the positioning mechanism 116 that positions the pusher member 18 at the pushed-in position engages the proximal claw 52 and the positioning projection 88 and fits the positioning piece 100 to the through window 46. Therefore, the positioning mechanism 116 is provided inside the chemical liquid injector 10. Therefore, for example, it is substantially impossible to cancel the positioning of the pusher member 18 and the apparatus main body 14, and the positioning state of the pusher member 18 and the apparatus main body 14, and consequently the hollow by the needle tip cover 16. The protection state of the tip side needle tip 22 of the needle 12 can be stably maintained.

  Further, in the present embodiment, in a state where both the needle tip cover 16 and the pusher member 18 are housed in the apparatus main body 14, the mutual interference portions (the restriction protrusion 70 and the inclined portion 94 of the arm portion 92 in particular) are provided. Since they are overlapped with each other, it is possible to avoid an increase in the axial dimension of the apparatus main body 14 and consequently the chemical liquid injector 10. In particular, in the present embodiment, since the arm portion 92 is elastically deformable, the overpassing operation of the restricting protrusion 70 by the arm portion 92 can be realized stably.

  Furthermore, in this embodiment, since the vial 20 is employed as an internal reservoir for storing a chemical solution, the internal reservoir can be provided in the chemical injection device 10 only by attaching the vial 20 to the pusher member 18. The leakage of the chemical liquid can be effectively avoided, and the ease of assembling the internal reservoir to the chemical liquid injection apparatus 10 and thus the manufacturing efficiency of the chemical liquid injection apparatus 10 can be improved. In addition, by preparing a plurality of vials 20 with different types of stored chemical solutions, it is possible to easily manufacture a plurality of chemical solution injection devices 10 that can inject different chemical solutions.

  Next, FIG. 23 shows a drug solution injection device 120 as a second embodiment of the present invention before the hollow needle 122 is punctured. FIG. 24 shows the drug solution injector 120 with the hollow needle 122 punctured, and FIG. 25 shows the state after the hollow needle 122 has been punctured. In the liquid injector 120 in this embodiment, a prefilled syringe 124 is employed as an internal reservoir. In the following description, members and parts that are substantially the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and detailed description thereof is omitted.

  That is, the prefilled syringe 124 of the present embodiment includes a syringe barrel 126 that substantially stores a chemical solution and a plunger 128 that is inserted from the proximal end side opening of the syringe barrel 126. A needle hub 130 to which the hollow needle 122 is fixed is integrally formed at the distal end portion of the syringe barrel 126, and the proximal end portion of the hollow needle 122 having only the distal needle tip 22 is fixed to the needle hub 130. Has been. The syringe barrel 126 is inserted and fixed to the inner peripheral wall portion 30 of the apparatus main body 14, and the distal end needle tip 22 of the hollow needle 122 protrudes from the distal end of the apparatus main body 14 to the distal end side.

  On the other hand, the plunger 128 constituting the prefilled syringe 124 is formed integrally with the pusher member 132. That is, the pusher member 132 of the present embodiment is shaped like a double cylinder having a plunger 128 on the inner peripheral side of the peripheral wall 80, and the base end side opening of the peripheral wall 80 has a substantially annular bottom wall portion. A substantially cylindrical plunger 128 extends from the inner peripheral edge of the bottom wall 81 toward the distal end side. A rubber stopper 134 is fixed to the distal end of the plunger 128, and the rubber stopper 134 is compressed in the radial direction by inserting the rubber stopper 134 from the proximal end opening of the syringe barrel 126. It comes in close contact with the peripheral wall of the barrel 126. However, the rubber stopper 134 may not be fixed to the plunger 128, and the rubber stopper 134 and the tip of the plunger 128 are axially separated from each other in the state before puncturing shown in FIG. Also good.

  A syringe barrel 126 including the hollow needle 122 is inserted and positioned in the inner peripheral wall portion 30 of the apparatus main body 14, and a pusher member 132 integrally including a plunger 128 is axially provided on the proximal end side of the apparatus main body 14. In this way, the chemical solution injection device 120 of this embodiment is configured. In the present embodiment, in the state before the puncture shown in FIG. 23, the distal end portions of the rubber stopper 134 and the plunger 128 are inserted from the proximal end side opening portion of the syringe barrel 126, and the proximal end side opening portion of the syringe barrel 126 is inserted. Is liquid-tightly closed.

  The method for containing the chemical in the prefilled syringe 124 is not limited in any way. For example, the hollow needle 122 is inserted in a state where the plunger 128 (pushing member 132) is pushed to the deepest part with respect to the syringe barrel 126. The medical solution can be stored in the prefilled syringe 124 by puncturing the rubber stopper of the vial in which the chemical solution is sealed and withdrawing the plunger 128 from this state. Then, the prefilled syringe 124 and the pusher member 132 in which the medicinal solution is stored are inserted from the proximal end side opening 113 of the apparatus main body 14, the syringe barrel 126 is inserted into the inner peripheral wall 30 of the apparatus main body 14, and the push The chemical injection device 120 of the present embodiment can be manufactured by assembling the child member 132 to the apparatus main body 14.

  The chemical injection device 120 having such a structure is also used in the same manner as in the first embodiment, and the pusher member 132 is centered with respect to the device main body 14 from the state before the puncture shown in FIG. By pushing a predetermined angle (45 degrees in this embodiment) around the axis, the pushing operation of the pusher member 132 to the apparatus main body 14 is allowed. By pressing the medicinal solution injection device 120 in such a state against the skin, the hollow needle 122 is punctured into the skin as shown in FIG. 24, and the pusher member 132 is further pushed into the device main body 14, whereby a prefilled syringe The medicinal solution contained in 124 is injected into the blood vessel of the patient.

  When the pusher member 132 is pushed down to the deepest part, the pusher member 132 is positioned at the push-in position by the positioning mechanism 116, and almost all of the chemical solution in the prefilled syringe 124 is injected into the blood vessel. After the injection of the drug solution, the hollow needle 122 is removed from the skin, so that the needle tip cover 16 is moved to the distal end side by the apparatus main body 14 by the elastic restoring action of the coil spring 110 as shown in FIG. Thus, the tip side needle tip 22 of the hollow needle 122 can be protected by the needle tip cover 16.

  Also in the chemical injection device 120 of the present embodiment configured as described above, the needle tip cover 16 is prevented from moving to the proximal end side by contacting the pusher member 132 positioned at the pushing position. The same effects as those of the first embodiment can be exhibited.

  Next, FIGS. 26 and 27 show a chemical liquid injector 140 as a third embodiment of the present invention. In other words, the shapes of the needle tip cover and the pusher member are not limited to those described in the above embodiment, and the needle tip cover 142 and the pusher member 144 constituting the chemical solution injector 140 of the present embodiment are not limited. It may be a shape. In the present embodiment, the illustration of the apparatus main body (14) is omitted. In the present embodiment, as in the first embodiment, the vial (20) is mounted as an internal reservoir inside the pusher member 144. However, as in the second embodiment, the internal reservoir A prefilled syringe (124) may be attached.

  That is, the peripheral wall 58 of the needle tip cover 142 is provided with a plurality (four in this embodiment) of supporting arm portions 146 projecting toward the proximal end, and the projecting tip portions of the supporting arm portions 146 are provided. A pair of elastic pieces 148 and 148 project from the both ends in the circumferential direction at the axial base end portion, and face each other in the circumferential direction. These elastic pieces 148 have a sufficiently small circumferential dimension, and can be elastically deformed in the circumferential direction.

  And at the projecting tips of these elastic pieces 148, there are provided restricting projections 150 as mutual interference portions projecting in directions approaching each other. That is, the circumferential separation distance of the elastic pieces 148 and 148 is reduced at the base end portion of the elastic piece 148 where the restricting protrusion 150 is formed, and the support arm 146, the elastic pieces 148 and 148, and the restricting protrusion. A region surrounded by the portions 150 and 150 is a storage region 152 extending in the axial direction. In particular, the circumferential separation distance between the restricting protrusions 150 and 150 is smaller than the width dimension of the vertical surface 160 of the positioning protrusion 158 described later. In the present embodiment, the end surface on the front end side of the restricting projection 150 is an inclined surface 154 that is inclined in a direction in which the projecting dimension gradually decreases toward the front end side.

  In addition, the peripheral wall 80 of the pusher member 144 is provided with a plurality of arms (156 in the present embodiment) projecting to the tip side on the periphery, and on the outer peripheral surface of the tip of each arm 156, Positioning protrusions 158 are provided as mutual interference portions protruding to the outer peripheral side. In particular, the positioning projection 158 of the present embodiment has a substantially triangular shape, and the distal end side end surface of the positioning projection 158 is a vertical surface 160 extending in the direction perpendicular to the axis, and the base end side is the restriction projection 150, The inclined surfaces 162 and 162 are inclined in the direction corresponding to the 150 inclined surfaces 154 and 154.

  And in the chemical | medical solution injection device 140 in this embodiment, in the state before puncture, as shown in FIGS. 26 and 27, the positioning projection 158 of the pusher member 144 enters the accommodating region 152 of the needle tip cover 142. . Specifically, the positioning projection 158 is located at the base end of the accommodating region 152, and the inclined surfaces 154 and 154 of the restricting projection 150, which is a mutual interference portion, and the inclined surfaces 162 and 162 of the positioning projection 158 are circumferential. Abutting and overlapping in direction. However, these inclined surfaces 154 and 160 may be separated from each other. By pressing the distal end of the chemical injection device 140 in such a state against the patient's skin, the needle tip cover 142 moves to the proximal end side with respect to the apparatus main body (14) as shown in FIG. By pushing the member 144 toward the distal end side with respect to the apparatus main body (14), the hollow needle 12 is punctured into the patient's skin, and the drug solution is injected into the blood vessel of the patient. At that time (that is, when the needle tip cover 142 is moved to the proximal end side and the pusher member 144 is moved to the distal end side), the positioning projection 158 of the pusher member 144 is moved to the distal end side within the accommodation region 152. Then, as shown in FIG. 28, the storage region 152 is moved to the end on the front end side. At this position, the pusher member 144 is positioned with respect to the apparatus main body (14). In this embodiment, a positioning mechanism for positioning the pusher member 144 and the apparatus main body (14) is not shown, but for example, a positioning mechanism (116) similar to that in the above-described embodiment may be employed.

  And after injection | pouring of a chemical | medical solution, the needle tip cover 142 is moved to the front end side with respect to the apparatus main body (14) by the elastic restoring action of the coil spring 110 by removing the hollow needle 12 from the skin, and it is hollow. The tip side needle tip 22 of the needle 12 can be protected by the needle tip cover 142. Further, in the protection state by the needle tip cover 142, the needle tip cover 142 is positioned on the distal end side with respect to the pusher member 144, and the pusher member 144 is placed against the restricting protrusions 150 and 150 of the needle tip cover 142. The positioning projection 158 abuts from the proximal end side, so that the movement of the needle tip cover 142 toward the proximal end side is prevented.

  In other words, in the present embodiment, the needle tip cover 142 moves toward the distal end side with respect to the pusher member 144 by the elastic restoring action of the coil spring 110 after the needle removal. In short, the positioning projection 158 located at the end on the distal end side of the storage area 152 is moved to the base end side in the storage area 152. At that time, due to the repulsive force of the coil spring 110, the needle tip cover 142 is moved further to the distal end side than the state before puncturing shown in FIGS. 26 and 27, and the positioning projection 158 is moved to the proximal end of the accommodation region 152. By abutting against the restricting protrusions 150 and 150 provided in the side openings, the restricting protrusions 150 and 150 (elastic pieces 148 and 148) are elastically deformed in the circumferential direction outside, that is, in a direction away from each other. As a result, the positioning protrusion 158 can pass between the expanded restricting protrusions 150 and 150, and the restricting protrusions 150 and 150 get over the positioning protrusion 158, as shown in FIG. 150 and 150 (elastic pieces 148 and 148) are elastically restored and deformed to the initial positions so that the base end side end surface of the restricting protrusion 150 is in contact with the vertical surface 160 of the positioning protrusion 158. In particular, in this embodiment, the distal end side surface of the restriction projection 150 and the proximal end side surface of the positioning projection 158 that contacts the distal end side surface are the inclined surface 154 and the inclined surface 162, respectively. The elastic deformation of 150, 150 (elastic pieces 148, 148) outward in the circumferential direction can be facilitated.

  Also in the chemical solution injector 140 of the present embodiment having the above-described structure, the pusher member 144 positioned at the push-in position comes into contact with the needle tip cover 142 from the proximal end side, so that the needle tip protection state is achieved. Since the movement of the needle tip cover 142 to the proximal end side is prevented, the same effect as in the first embodiment can be exhibited.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.

  For example, in the above-described embodiment, the positioning mechanism 116 is configured to include the engagement between the proximal end claw portion 52 and the positioning projection 88 and the fitting of the positioning piece 100 to the through window 46. Either may be sufficient. However, the specific structure of the positioning mechanism for positioning the pusher member with respect to the apparatus main body is not limited in any way. For example, the uneven structure as described above is provided opposite to the apparatus main body and the pusher member. Also good. In the above embodiment, the portion into which the positioning piece 100 is fitted is the through window 46 that penetrates the outer peripheral wall 32 of the apparatus main body 14 in the thickness direction. With the bottom hole shape, it may be more difficult to release the positioning of the apparatus main body 14 and the pusher member 18 by the positioning mechanism 116 from the outside.

  Further, in the above-described embodiment, the base end side claw portion 52, the positioning protrusion 88, the positioning piece 100, and the through window 46 constituting the positioning mechanism 116 are all provided at the base end portions of the apparatus main body 14 and the pusher member 18. In the state where the pusher member 18 is in the push-in position, the positioning mechanism 116 is provided at the proximal end portion of the chemical liquid injectors 10, 120, 140. However, in the positioning mechanism, the pusher member is in the push-in position. In a state, you may provide in the axial direction intermediate part and front-end | tip part of a chemical injection device. Furthermore, as in the above-described embodiment, the positioning mechanism 116 includes the engagement between the proximal end claw portion 52 and the positioning projection 88 and the fitting of the positioning piece 100 to the through window 46. However, these axial positions may be different from each other, for example, either one is between the tip portion or the axial middle portion of the apparatus main body and the tip portion or the axial middle portion of the pusher member. It may be provided.

  Further, in the above-described embodiment, in a state where the pusher member 18 is in the push-in position, the proximal end of the pusher member 18 is substantially at the same axial position as the proximal end side opening 113 of the apparatus main body 14 or slightly in the axial direction. Although it was located inward in the direction, the proximal end of the pusher member may be located axially outward from the proximal end side opening of the apparatus main body. Furthermore, in a state where the pusher member is in the push-in position, the pusher member may be movable in the axial direction (for example, the base end side) by a predetermined distance. That is, when the pusher member moves to the base end side (that is, the direction opposite to the pushing direction), the needle tip cover can also move to the base end side, but with a movement amount that does not expose the needle tip of the hollow needle. If so, the protection state of the needle tip by the needle tip cover can be maintained.

  Further, in the present invention, the lock fixing mechanism 112 that disables the pushing operation of the pusher member 18 with respect to the apparatus main body 14 before the pusher member 18 is punctured is not essential. Even when a lock fixing mechanism is provided, the circumferential groove 82 is not essential, and only an axial groove may be provided. In such a case, a locking projection that disables the pushing operation of the pusher member is provided at the axially intermediate portion of the axial groove, and the proximal claw portion gets over the locking projection so that the pusher The pushing operation of the member may be allowed. In the embodiment, the lock by the lock fixing mechanism 112 is released by rotating the pusher member 18 by 45 degrees in the circumferential direction with respect to the apparatus main body 14. The rotation angle is not limited at all.

  Furthermore, in the above-described embodiment, the coil spring 110 is employed as an elastic member that exerts an urging force toward the distal end side on the needle tip cover 16, but it may be a cylindrical member made of a rubber elastic body, a magnetic force, etc. The urging force may be exerted on the needle tip cover by using. However, such an elastic member or the like is not essential, and the needle tip cover that has moved to the proximal side when the hollow needle is punctured may be manually moved to the distal side when the hollow needle is removed.

  Furthermore, in the above-described embodiment, the distal end portions (arm portions 92, 156) of the pusher members 18, 132, 144 positioned at the push-in positions directly contact the proximal end portions of the needle tip covers 16, 142, and the needle tips. Although movement to the base end side of the covers 16 and 142 was prevented, an intermediate member may be provided between the needle tip cover and the pusher member, and the intermediate member is interposed therebetween. The needle tip cover and the pusher member may be brought into contact with each other to prevent the needle tip cover from moving toward the proximal end side.

  Moreover, in the said 1st Embodiment, although the vial 20 was mounted | worn inside the pusher member 18, a pusher member may be comprised by the vial itself. Specifically, the pusher member may be constituted by a bottle constituting the vial. In such a case, for example, the pusher member is pushed between the inner circumferential surface of the outer circumferential wall portion and the outer circumferential surface of the bottle body. A positioning mechanism for positioning the child member (bottle body) at the push-in position may be provided.

  In the second embodiment, the plunger 128 is integrally formed inside the pusher member 132. However, the pusher member and the plunger may be separated. That is, the syringe barrel may be assembled to the apparatus main body and the plunger may be assembled to the pusher member, and the apparatus main body and the pusher member may be assembled to each other. In such a case, a commercially available syringe can be used. is there. When the internal reservoir is a syringe type as described above, it is not limited to the mode of assembling a prefilled syringe in which a chemical solution is stored in advance as in the second embodiment, and a chemical solution injection device is manufactured. After that, the drug solution may be accommodated in the syringe barrel through the tip of the hollow needle. Specifically, the chemical injection device is manufactured in a state where it is advanced to a position immediately before the pusher member is positioned with respect to the device main body, and in this state, the needle tip of the hollow needle is immersed in the chemical, If a member is moved to the base end side, a chemical | medical solution can be accommodated in a syringe barrel. In the second embodiment, the syringe barrel 126 is not indispensable, and an internal reservoir can be constituted by the inner peripheral wall portion.

  Furthermore, in the present invention, it is essential that the needle tip cover at the position for protecting the needle tip of the hollow needle is in contact with the pusher member positioned at the push-in position to prevent the movement toward the proximal end side. It is not a thing. That is, the needle tip cover as in the above embodiment is not essential, and for example, a mechanism for protecting the needle tip of the hollow needle after use may be provided separately, or the needle tip of the hollow needle after use is not necessarily protected. It does not have to be done.

  In the first embodiment, the stopper body 106 is pushed into the bottle body 104 of the vial 20 to the deepest part (until the stopper body 106 comes into contact with the bottom wall portion on the proximal end side of the bottle body 104). Although the position is the pushing position of the pusher member 18 with respect to the apparatus main body 14, it is not limited to this mode. That is, for example, the position where the stopper is pushed to the middle portion in the axial direction of the bottle may be set as the pushing position and positioned by the positioning mechanism. Similarly, in the said 2nd Embodiment, the position where the plunger was pushed in to the axial direction intermediate part of the syringe barrel may be made into the pushing position, for example.

  Further, in the first and second embodiments, the arm portion 92 gets over the restricting protrusion 70 by elastically deforming the arm portion 92 toward the inner peripheral side with respect to the restricting protrusion 70. The restricting projection that can be flexibly deformed or elastically deformed elastically deforms toward the outer peripheral side with respect to the arm portion, so that the arm portion may get over the restricting projection. In such a case, the flexible portion that can be bent and deformed at the proximal end portion of the needle tip cover can be constituted by the restricting protrusion.

  Furthermore, in the first and second embodiments, the vial 20 and the prefilled syringe 124 are employed as the internal reservoir. However, as the internal reservoir, for example, the distal end side and the proximal end side are sealed with a plug or the like, and the internal reservoir is disposed inside. You may employ | adopt the cartridge in which the chemical | medical solution is stored. In this case, for example, the proximal end needle tip of the hollow needle that is a double-ended needle can be punctured with respect to the distal end side plug body, and the proximal end side plug body becomes a cartridge along with the pushing operation of the pusher member. It is possible to move to the tip side inside. In addition, when such a cartridge is employed, the proximal end of the hollow needle is punctured into the plug on the distal end so that the chemical solution inside the cartridge does not leak from the hollow needle, and the inside and outside of the cartridge are communicated. The operation is performed when the cartridge is pushed to the front end side with respect to the apparatus main body in accordance with the pushing operation of the pusher member, when the pusher member to which the cartridge is fixed is attached to the apparatus main body, or when the pusher member is attached to the apparatus main body. It may be configured to be achieved when the cartridge is attached to the apparatus main body before being attached to the main body. In the chemical injection device having such a structure, for example, the cartridge is moved to the distal end side by the pushing operation of the pusher member, and the proximal end needle tip of the hollow needle is punctured into the distal end side stopper body. Further, when the pusher member is pushed, the plug on the proximal end side moves to the distal end side inside the cartridge, and the medical solution inside the cartridge is configured to be administered to the patient.

10, 120, 140: Chemical solution injection device, 12, 122: Hollow needle, 14: Device body, 16, 142: Needle tip cover, 18, 132, 144: Pusher member, 20: Vial (internal reservoir), 22: Tip side needle tip (needle tip), 70: restriction protrusion (mutual interference portion), 92: arm portion (mutual interference portion, flexible piece), 94: inclined portion (mutual interference portion), 104: bottle body, 106 : Plug body, 112: lock fixing mechanism, 116: positioning mechanism, 118: reuse prevention mechanism, 124: prefilled syringe (internal reservoir), 150: regulating projection (mutual interference portion), 158: positioning projection (mutual interference portion) )

Claims (11)

By pushing the pusher member from the base end side against the main body having a hollow needle on the distal end side, the medicinal solution stored in the internal reservoir is poured out through the hollow needle, and the needle tip of the hollow needle is In the chemical injection device in which the needle tip cover to be protected is assembled to be movable in the axial direction with respect to the device main body,
A positioning mechanism for positioning the pusher member to the pushing position into the apparatus main body is provided between the pusher member to be directly pushed and the apparatus main body, and is positioned to the pushing position by the positioning mechanism. The chemical liquid injector according to claim 1, wherein movement of the needle tip cover toward the proximal end side is restricted by an abutting action on the pusher member.   The chemical injection device according to claim 1, wherein a vial including a bottle and a stopper is adopted as the internal reservoir.   The chemical injection device according to claim 1, wherein a prefilled syringe is employed as the internal reservoir.   The reuse mechanism according to any one of claims 1 to 3, wherein in the positioning mechanism, the pusher member is positioned so as not to have a release operation means for positioning the pusher member into the apparatus main body. The chemical injection device according to claim 1.   5. The lock fixing mechanism according to claim 1, wherein a lock fixing mechanism is provided between the pusher member and the apparatus main body to disable a pushing operation of the pusher member with respect to the apparatus main body. Chemical injection device.   The fixing by the lock fixing mechanism is released by relatively rotating the pusher member and the apparatus main body in the circumferential direction, and the pushing operation of the pusher member to the apparatus main body is allowed. Item 6. A chemical injection device according to Item 5.   The proximal end portion of the needle tip cover is provided with a flexible portion that can be bent and deformed, and the distal end portion of the pusher member that has been directly pushed in passes over the flexible portion, thereby the pusher member. The chemical solution injection device according to any one of claims 1 to 6, wherein the liquid injection device reaches the push-in position.   A flexible piece that can be bent and deformed is provided at the distal end portion of the pusher member, and the flexible piece of the pusher member that has been directly pushed in passes over the proximal end portion of the needle tip cover. The chemical injection device according to any one of claims 1 to 7, wherein the pusher member reaches the push-in position. A mutual interference part is provided between the distal end portion of the pusher member and the proximal end portion of the needle tip cover,
The distal end of the pusher member with respect to the device main body is formed by the mutual interference portions overlapping each other in a state where the needle tip cover moves to the proximal end side with respect to the device main body and the needle tip of the hollow needle is exposed. While movement to the side is allowed,
In a state where the pusher member is positioned at the pushing position with respect to the apparatus main body, the needle tip cover protrudes from the apparatus main body to the distal end side, thereby eliminating mutual overlap in the mutual interference portion, The drug solution injection device according to any one of claims 1 to 8, wherein movement of the needle tip cover toward the proximal end side is regulated by the mutual abutting action of the mutual interference portions. In the chemical solution injection device in which the chemical solution stored in the internal reservoir is pushed out through the hollow needle by pushing the pusher member from the proximal end side with respect to the device main body provided with the hollow needle on the distal end side,
A vial provided with a bottle and a stopper is adopted as the internal reservoir, the stopper is positioned with respect to the apparatus main body, and the bottle moves to the distal end side with the pushing operation of the pusher member. Then, the drug solution injection device is characterized in that the drug solution in the vial is poured out through the hollow needle penetrated through the stopper. A chemical solution that is assembled so as to be movable in the axial direction from the base end side of the apparatus main body provided with a hollow needle on the distal end side, and is stored in the internal reservoir by being pushed into the apparatus main body is injected through the hollow needle. A pusher member for a chemical solution injection device that can be put out,
A vial that constitutes the internal reservoir is mounted, and the vial body that is positioned by the device body is held by holding the vial body and moving the vial body toward the distal end side with respect to the device body. The pusher member is characterized by moving the bottle body.

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