JP2014188094A - Liquid administering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid administering tool capable of preventing liquid from discharging from the tip of a needle tube when interrupting liquid administration.SOLUTION: A liquid administering tool includes: a cylindrical body having a cylindrical shape and allowing filling liquid therein; a needle tube provided on the tip end side of the cylindrical body so as to be communicated with the cylindrical body or communicable therewith, and having a sharp needle tip on the tip end; a gasket slidable in the cylindrical body; an operation member performing a pressing operation of pressing the gasket to the tip end direction, and discharging the liquid filled in the cylindrical body through the needle tube; and a liquid stopping mechanism having an elastic member and switching a first state in which the liquid is prevented from flowing in the inner cavity of the needle tube by the elastic deformation of the elastic member, and a second state in which the liquid can flow in the inner cavity of the needle tube.

Description

  The present invention relates to a liquid administration device.

  Conventionally, a prefilled syringe that is filled with a chemical solution aseptically and that can administer the chemical solution is known.

  The prefilled syringe is a syringe outer cylinder having a mouth part for discharging a chemical solution, a needle tube provided at the mouth part of the syringe outer cylinder and having a sharp needle tip at the tip, a gasket capable of sliding in the syringe outer cylinder, A drug solution filled in a space surrounded by the syringe outer cylinder and the gasket, and a plunger connected to the proximal end side of the gasket and pressing the gasket toward the distal end to discharge the drug solution from the mouth. Yes. When administering a drug solution using a prefilled syringe, the needle tube is punctured into the living body, and the plunger is pressed in this punctured state. Thereby, a chemical | medical solution will be discharged from a mouth part with a gasket, Therefore The said chemical | medical solution can be administered to a biological body via a needle tube.

  In addition, in the prefilled syringe described in Patent Document 1, the needle tube is surrounded by a cylindrical foldable needle cover in order to conceal the needle tube so as not to be visible during administration of the drug solution.

  By the way, when a drug solution is administered to a living body, there is a case where it is desired to temporarily stop the administration for the purpose of, for example, reducing the pain caused by the drug solution.

  However, in the conventional prefilled syringe including the prefilled syringe described in Patent Document 1, when the administration of the drug solution is interrupted and the needle tube is removed from the living body, if the plunger is accidentally pushed, the drug solution is discharged from the needle tip of the needle tube. There is a risk of it.

Japanese National Patent Publication No. 10-506822

  The objective of this invention is providing the liquid administration tool which can prevent that a liquid discharges from the front-end | tip of a needle tube, when the administration of a liquid is interrupted.

Such an object is achieved by the present inventions (1) to (15) below.
(1) a cylindrical body that can be filled with liquid;
A needle tube which is provided on the distal end side of the cylindrical body so as to communicate with or communicate with the cylindrical body and has a sharp needle tip at the distal end;
A gasket that can slide in the cylinder;
An operation member that performs a pressing operation of pressing the gasket toward the distal end and discharging the liquid filled in the cylindrical body through the needle tube;
A first state in which an elastic member is provided and the liquid is prevented from flowing through the lumen of the needle tube by elastic deformation of the elastic member; and a second state in which the liquid can flow through the lumen of the needle tube A liquid administration device comprising: a liquid stopping mechanism for switching to the state.

  (2) The liquid stop mechanism moves the needle tube in the axial direction of the needle tube by expansion and contraction of the elastic member, so that in the first state, the needle tube does not communicate with the cylinder, and the second In this state, the liquid administration device according to (1), wherein the needle tube is configured to communicate with the cylindrical body.

(3) The needle tube is a double-ended needle,
A support member that supports the needle tube, and is disposed on the distal end side of the cylindrical body so as to be movable in the axial direction of the needle tube with respect to the cylindrical body;
A sealing member that is installed on the distal end side of the cylindrical body and seals an outlet of the liquid filled in the cylindrical body;
The support member includes a non-communication position where the proximal end side of the needle tube does not pierce the sealing member due to expansion and contraction of the elastic member, and the needle tube does not communicate with the cylinder, and a proximal end of the needle tube The liquid administration device according to (2), wherein the needle tip on the side penetrates the sealing member and the needle tube moves to a communication position where the needle tube communicates with the cylindrical body.

  (4) The liquid administration device according to (3), wherein the support member has an abutting surface that abuts against a surface of the living body when the liquid is administered to the living body.

(5) In the second state, the support member moves in a proximal direction against the elastic force of the elastic member by a reaction force when the contact surface is pressed against the surface of the living body, A needle tip on the proximal end side of the needle tube penetrates the sealing member, and the needle tube communicates with the cylindrical body,
When the pressing of the contact surface against the surface of the living body is released, the elastic member is extended by its elastic force, the support member is moved in the distal direction by the elastic member, and the proximal end side of the needle tube is moved. The liquid administration device according to (4), wherein the needle tip does not pierce the sealing member, and the needle tube does not communicate with the cylindrical body, and switches to the first state.

  (6) The needle tip on the proximal end side of the double-ended needle has a function of preventing a part of the sealing member from clogging the lumen of the needle tip when the sealing member is punctured with the needle tip. The liquid administration device according to any one of (3) to (5) above, comprising:

(7) The cylindrical body has a first engagement portion,
The support member has a second engagement portion that can engage with the first engagement portion,
In the non-communication position, the support member is prevented from moving in the distal direction when the second engagement portion engages with the first engagement portion. (3) to (6) The liquid administration device according to any one of the above.

  (8) The liquid administration device according to any one of (2) to (7), wherein the elastic member has a cylindrical shape and is disposed concentrically with the needle tube.

  (9) The liquid administration device according to any one of (2) to (8), wherein the elastic member biases the support member and the cylindrical body in a direction away from each other.

  (10) In the first state, the liquid stopper mechanism seals the needle tip with the elastic member, and in the second state, the elastic member contracts in an axial direction of the needle tube, and the elastic member The liquid administration device according to (1), wherein the needle tip projects from a tip of a member.

  (11) A base end portion of the elastic member is disposed at a distal end portion of the cylindrical body, and abuts against the distal end portion of the elastic member when the liquid is administered to the living body. The liquid administration device according to the above (10) having a surface.

(12) In the second state, the elastic member contracts due to a reaction force when the contact surface is pressed against the surface of the living body, and the needle tip protrudes from the contact surface,
When the pressing of the contact surface against the surface of the living body is released, the elastic member expands by its elastic force, seals the needle tip, and switches to the first state (11) The liquid administration device described.

  (13) The above (10) to (10), wherein the needle tip has a function of preventing a part of the elastic member from being clogged in a lumen portion of the needle tip portion when the elastic member is punctured with the needle tip. The liquid administration device according to any one of 12).

  (14) The liquid administration device according to any one of (1) to (13), wherein the operation member includes an auxiliary mechanism that generates an auxiliary force for pressing the gasket.

  (15) The liquid administration device according to (14), wherein the auxiliary mechanism includes a biasing member that biases the cylindrical body and the operation member toward each other.

  According to the present invention, since the liquid stopping mechanism is provided, it is possible to prevent the liquid from being discharged from the tip of the needle tube removed from the living body when the liquid administration is temporarily interrupted. In addition, administration of the liquid can be resumed.

  Thereby, it is possible to prevent the liquid from being wasted or insufficient, and a sufficient amount of the liquid can be administered to the living body.

It is a side view which shows 1st Embodiment of the liquid administration device of this invention. It is a longitudinal cross-sectional view of the liquid administration device shown in FIG. It is a figure for demonstrating the operation | movement at the time of use of the liquid administration device shown in FIG. It is a figure for demonstrating the operation | movement at the time of use of the liquid administration device shown in FIG. It is a figure which shows the other structural example of the double-ended needle of the liquid administration device shown in FIG. It is a side view which shows 2nd Embodiment of the liquid administration device of this invention. It is a longitudinal cross-sectional view of the liquid administration device shown in FIG. It is a figure for demonstrating the operation | movement at the time of use of the liquid administration device shown in FIG. It is a figure for demonstrating the operation | movement at the time of use of the liquid administration device shown in FIG. It is a side view (figure which notched partially) which shows the operation state at the time of use of a 3rd embodiment of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a disassembled perspective view which shows the positional relationship of the operation member with which the liquid administration tool of this invention is equipped, and a control member. It is a disassembled perspective view which shows the positional relationship of the control member with which the liquid administration tool of this invention is provided, and a cover member. It is the figure which looked at the regulating member with which the liquid administration device of the present invention is provided from the tip side. It is a perspective view which shows the puncture needle with which the liquid administration tool of this invention is provided. It is a side view (figure which notched partially) which shows the operation state at the time of use of the 4th embodiment of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a side view (figure which notched partially) which shows the operation state at the time of use of the liquid administration device of the present invention in order. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG. It is a longitudinal cross-sectional view of the liquid administration device in the state shown in FIG.

  Hereinafter, the liquid administration device of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

<First Embodiment>
FIG. 1 is a side view showing a first embodiment of the liquid administration device of the present invention. 2 is a longitudinal sectional view of the liquid administration device shown in FIG. 1, FIG. 2 (a) is an overall longitudinal sectional view, and FIG. 2 (b) is an enlarged longitudinal sectional view of a distal end portion of the liquid administration device, FIG.2 (c) is a longitudinal cross-sectional view of the vicinity of the proximal end needle point of a double-ended needle. FIGS. 3 and 4 are views for explaining the operation when using the liquid administration device shown in FIG. 1, respectively. FIGS. 3 (a) and 4 (a) are side views and views, respectively. 3 (b) and FIG. 4 (b) are longitudinal sectional views, respectively, and FIG. 3 (c) and FIG. 4 (c) are enlarged longitudinal sectional views of the distal end portion of the liquid administration device, respectively. FIG. 5 is a diagram showing another configuration example of the double-ended needle of the liquid administration device shown in FIG.

  In the following, the upper side in FIGS. 1 to 4 is “base end (rear end)”, the lower side is “tip”, the vertical direction is “axial direction” or “longitudinal direction”, and the right side in FIG. The description will be made with the “base end (rear end)” and the left side as the “front end”.

  A liquid administration device 10 shown in FIG. 1 is a medical instrument used when a liquid is administered (injected) into a living body. The liquid is appropriately selected according to the purpose of use. For example, hematopoietic agents, vaccines, hormone preparations, anti-rheumatic agents, anti-cancer agents, anesthetics, anticoagulants, etc. are mainly injected subcutaneously. Chemicals.

  As shown in FIG. 1 and FIG. 2, the liquid administration device 10 is installed in a cylinder (syringe outer cylinder) 17 that can be filled with a liquid, and in the cylinder 17, and in the axial direction (longitudinal direction) of the cylinder 17. A gasket 3 that can slide along, a plunger (operation member) 18 that moves (presses) the gasket 3 along the axial direction of the cylindrical body 17, a double-ended needle (needle tube) 2, and a support member 9. A first state in which the liquid flows through the lumen of the double-ended needle 2 by elastic deformation, and a second state in which the liquid can flow through the lumen of the double-ended needle 2 An elastic member 5 is provided as a liquid stopper mechanism for switching to a state. The gasket 3 is connected to the tip of the plunger 18.

  The cylindrical body 17 includes a bottom 171 at the front end, a side wall 172 standing from the edge of the bottom 171 and a member having an opening at the base end, that is, a member having a bottomed cylindrical shape. The bottom 171 has a mortar shape. The cylindrical body 17 can be filled with a liquid. Further, a scale (not shown) indicating the amount of liquid is attached to the outer peripheral surface of the cylindrical body 17. The scale may be omitted.

A flange 175 is integrally formed on the outer periphery of the proximal end portion of the cylindrical body 17.
Further, at the distal end portion of the cylindrical body 17, that is, the central portion of the bottom portion 171, a mouth portion (reduced diameter portion) 173 through which the liquid passes through is reduced in diameter with respect to the portion of the side wall 172 of the cylindrical body 17. Is formed. From the mouth 173, liquid is sucked or discharged.

  In addition, a cylindrical wall portion 174 is integrally formed at the distal end portion of the cylindrical body 17, that is, at a portion on the outer peripheral side of the mouth portion 173 in the bottom portion 171. The wall portion 174 is disposed concentrically with the mouth portion 173 on the outer peripheral side of the mouth portion 173.

  In addition, four grooves 176 extending along the axial direction of the wall portion 174 are formed on the outer peripheral surface of the wall portion 174 (see FIGS. 1 and 2). The grooves 176 are arranged in parallel at equal angular intervals along the circumferential direction of the wall portion 174. In addition, each groove 176 is formed up to the front of the front end of the wall portion 174, thereby forming a stepped portion (first engaging portion) 177 at the front end portion of each groove 176 of the wall portion 174. In addition, the site | part corresponding to each groove | channel 176 of the wall part 174 is thick, and each groove | channel 176 is formed in the thick site | part.

  Further, the cylindrical body 17 is provided with a sealing member (sealing portion) 191 that seals the mouth portion 173 in a liquid-tight manner, and the sealing member 191 is fixed by a fixing member 192 from the distal end side. Yes.

  The sealing member 191 is made of an elastic body, and has a convex portion formed on the base end surface thereof. The convex portion is liquid-tightly fitted to the mouth portion 173, thereby sealing the mouth portion 173 in a liquid-tight manner. doing.

  The fixing member 192 is a cylindrical member. The fixing member 192 is fitted to the sealing member 191 and the mouth portion 173 from the front end side and the outer peripheral side of the sealing member 191 and the mouth portion 173, and fixes the sealing member 191 to the cylindrical body 17. Thereby, the separation of the sealing member 191 from the cylindrical body 17 is reliably prevented. The fixing method of the fixing member 192 is not particularly limited, and may be a method using adhesion or a method using welding.

  Moreover, it does not specifically limit as a constituent material of the cylinder 17, the plunger 18, the fixing member 192, and the supporting member 9, For example, polyvinyl chloride, polyethylene, a polypropylene, cyclic polyolefin, polystyrene, poly- (4-methylpentene- 1) Polycarbonate such as polycarbonate, acrylic resin, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polyethylene naphthalate, butadiene-styrene copolymer, polyamide (for example, nylon 6, nylon 6,6, nylon 6, 10 and nylon 12). Among them, resins such as polypropylene, cyclic polyolefin, polyester, and poly- (4-methylpentene-1) are preferable because they are easy to mold. .

  Moreover, it does not specifically limit as an elastic material which comprises the sealing member 191, the gasket 3, and the elastic member 5, For example, natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, silicone rubber, etc. Examples thereof include elastic materials such as rubber materials, various thermoplastic elastomers such as polyurethane, polyester, polyamide, olefin, and styrene, and mixtures thereof.

  As shown in FIG. 2, a puncture needle 50 is disposed at the distal end portion of the cylindrical body 17. The puncture needle 50 includes a double-ended needle (needle tube) 2 and a support member 9 that supports and fixes the double-ended needle 2.

  The double-ended needle 2 is a hollow needle tube, has a sharp distal needle tip (needle tip) 21 at the distal end, and has a sharp proximal needle tip (needle tip) 23 at the proximal end. The double-ended needle 2 can puncture the living body with the distal needle tip 21 and can pierce the sealing member 191 with the proximal needle tip 23.

  Further, when the proximal end needle tip 23 of the double-ended needle 2 pierces (punctures) the sealing member 191 with the proximal end needle tip 23, a part of the sealing member 191 becomes a part of the proximal end needle tip 23. It has a function of blocking the flow path 22 (lumen), that is, coring. Specifically, the external shape of the proximal end needle tip 23 of the double-ended needle 2 has a conical shape, and two openings 24 communicating with the flow path 22 of the double-ended needle 2 are formed on the side surface of the cone. ing. The openings 24 are arranged at equiangular intervals (90 ° intervals) along the circumferential direction of the double-ended needle 2.

  Accordingly, the proximal end of the double-ended needle 2 is used when the administration of the liquid is temporarily interrupted and then the administration of the liquid is resumed, or when the liquid filled in the cylindrical body 17 is administered in a plurality of times. Even if the side needle tip 23 pierces the sealing member 191 many times, the coring of the double-ended needle 2 can be prevented, and the liquid can be reliably administered.

  In addition, the structure of the proximal end needle tip 23 of the double-ended needle 2 having the function of preventing the coring is not limited to the above-described structure, and for example, FIG. 5 (a), FIG. 5 (b), Examples include the structures shown in FIGS. 5C, 5D, 5E, 5F, and 5G.

  The lumen portion (hollow portion) of the double-ended needle 2 communicates with the cylindrical body 17 with the proximal needle tip 23 pierced through the sealing member 191, and the flow through which the liquid from the cylindrical body 17 passes. It functions as the path 22.

  After the living body is punctured from the skin to a predetermined depth with the distal needle tip 21 of the double-ended needle 2, the proximal needle tip 23 penetrates the sealing member 191, and the liquid passes through the flow path of the double-ended needle 2 into the body. Injected.

  In addition, it does not specifically limit as a constituent material of the double-ended needle 2, For example, metal materials, such as stainless steel, aluminum, or an aluminum alloy, titanium, or a titanium alloy, are mentioned.

  The double-ended needle 2 having such a configuration is configured such that the elastic member 5 described later expands and contracts at the distal end portion of the cylindrical body 17 via the support member 9, that is, the wall portion 174, so that the cylindrical body 17 (double-ended needle 2). It is mounted so as to be movable along the axial direction. The support member 9 supports the double-ended needle 2 movably along the axial direction of the cylindrical body 17 (double-ended needle 2) with respect to the cylindrical body 17. The support member 9 has a bottomed cylindrical shape. The double-ended needle 2 is supported and fixed to the bottom portion of the support member 9 at an intermediate position. The distal end surface of the support member 9 is a contact surface that contacts the surface of the living body when the liquid is administered to the living body.

  Further, four arm portions 95 are formed on the base end portion of the support member 9 so as to protrude in the base end direction (see FIGS. 1 and 2). The arm portions 95 are arranged side by side at equal angular intervals along the circumferential direction of the support member 9. A protrusion (second engagement portion) 951 that protrudes toward the center of the support member 9 is formed on the inner peripheral side of the base end portion of each arm portion 95. In addition, the position of the base end of each arm part 95 and the position of the base end of parts other than the arm part 95 of the support member 9 correspond.

  As shown in FIGS. 1 and 2, in an unused state (initial state), the protrusion 951 of each arm portion 95 is inserted into each groove 176 of the wall portion 174 of the cylindrical body 17, and is engaged with each groove 176. By combining, the puncture needle 50 is prevented from rotating in the circumferential direction during puncturing. Thereby, when the proximal end needle tip 23 of the double-ended needle 2 penetrates the sealing member 191, coring can be prevented.

  Further, the support member 9 (puncture needle 50) is prevented from moving in the distal direction by engaging the protrusions 951 of the arm portions 95 with the step portions 177 of the wall portion 174 in the non-communication position. The separation from the tip of the body 17 is prevented.

  As described above, the double-ended needle 2 is supported so as to be movable along the axial direction with respect to the cylindrical body 17 via the support member 9. As a result, the double-ended needle 2 has the proximal end needle tip 23 of the double-ended needle 2 separated from the sealing member 191 of the cylindrical body 17 and the separated state shown in FIGS. 23 can take the piercing state shown in FIG. 3 where the sealing member 191 is pierced. That is, in the support member 9 (puncture needle 50), the proximal needle tip 23 of the double-ended needle 2 does not pierce the sealing member 191 due to expansion and contraction of the elastic member 5 described later, and the double-ended needle 2 is in the cylindrical body 17. The non-communication position that does not communicate and the proximal end needle tip 23 of the double-ended needle 2 pierce the sealing member 191, and the double-ended needle 2 moves to a communication position that communicates within the cylindrical body 17. Therefore, unintentional leakage of the liquid from the double-ended needle 2 is prevented until the piercing state is reached, that is, until the support member 9 moves to the communication position. Further, when the support member 9 is moved again from the communication position to the non-communication position when the separation state is reached again from the piercing state, unintentional leakage of the liquid from the double-ended needle 2 is prevented. The separated state is a first state where the liquid is prevented from flowing through the lumen of the double-ended needle 2, and the piercing state is a second state where the liquid can flow through the lumen of the double-ended needle 2. State.

  The gasket 3 is accommodated in the cylinder 17 so as to be slidable along the axial direction of the cylinder 17. Note that the space surrounded by the gasket 3 and the cylindrical body 17 is filled with a liquid in advance. Then, by moving the gasket 3 toward the distal end direction, the liquid in the cylindrical body 17 can be pushed out from the double-ended needle 2 in a state communicating with the cylindrical body 17.

  The gasket 3 has a disk-like outer shape, and two projecting portions 31 and 32 are formed to project from the outer periphery thereof. The protrusion 31 and the protrusion 32 are separated along the axial direction of the gasket 3. Further, each of the protrusions 31 and 32 has a ring shape along the circumferential direction of the gasket 3, and the outer diameter thereof is slightly larger than the inner diameter of the cylindrical body 17 in a natural state where no external force is applied. Thereby, each of the protrusions 31 and 32 can slide while being in close contact with the inner peripheral portion of the side wall 172 of the cylindrical body 17. Improvement can be achieved.

  Further, the base end surface of the gasket 3 is opened with a concave portion 33 into which the main body portion 181 of the plunger 18 is inserted (fitted) and connected.

  The plunger 18 is a member that performs a pressing operation (discharge operation) for discharging the liquid in the cylindrical body 17 from the double-ended needle 2 by pressing and moving the gasket 3 toward the distal direction.

  The plunger 18 has a rod-like main body 181 whose cross section is, for example, a cross or circular shape, and the gasket 3 is fixed to the tip of the main body 181. A disc-shaped flange 182 is formed at the base end of the main body 181.

  A connecting portion 183 corresponding to the shape of the concave portion 33 of the gasket 3 is formed at the distal end portion of the main body portion 181. By inserting the connecting portion 183 into the recess 33 of the gasket 3, the plunger 18 and the gasket 3 are connected. In addition, the method of fixing the gasket 3 to the main body 181 is not limited to this. For example, a male screw is formed on the main body 181 and a female screw is formed on the gasket 3 to be screwed to the male screw. And a method of screwing the two together. In the present embodiment, the plunger 18 is connected to the proximal end side of the gasket 3, but may not be connected.

  The elastic member 5 has a cylindrical shape and a bellows shape, and is configured to be stretchable. The elastic member 5 is installed at the tip of the cylindrical body 17. That is, the elastic member 5 is disposed concentrically with the double-ended needle 2 on the outer peripheral side of the double-ended needle 2, the proximal end portion of the elastic member 5 is fixed to the fixed member 192, and the distal end portion is fixed to the support member 9. Yes.

  The supporting member 9 (puncture needle 50) and the cylindrical body 17 are urged by the elastic member 5 in a direction away from each other. That is, the support member 9 is urged toward the distal end with respect to the cylindrical body 17.

  More specifically, in the first state shown in FIGS. 1 and 2, the elastic member 5 is in a natural state where no external force is applied, or in a state where the elastic member 5 is slightly contracted in the axial direction of the double-ended needle 2. When the elastic member 5 is in the second state shown in FIG. 3, the elastic member 5 is contracted in the axial direction of the double-ended needle 2 and biases the support member 9 in the distal direction. By moving the support member 9 in the axial direction of the double-ended needle 2 by the expansion and contraction of the elastic member 5, the double-ended needle 2 does not communicate with the cylindrical body 17 in the first state, and the double-ended needle in the second state. 2 communicates with the cylindrical body 17. That is, in the second state, the support member 9 moves in the proximal direction against the elastic force of the elastic member 5 by the reaction force when the distal end surface is pressed against the surface of the living body, and the base of the double-ended needle 2 The end side needle tip 23 penetrates the sealing member 191, and the double-ended needle 2 communicates with the cylindrical body 17. Further, when the support member 9 releases the pressing of the distal end surface against the surface of the living body, the elastic member 5 expands by the elastic force, and the support member 9 is moved in the distal end direction by the elastic member 5, and the double-ended needle The second proximal needle tip 23 does not pierce the sealing member 191, and the double-ended needle 2 does not communicate with the cylindrical body 17, and switches to the first state.

  Next, a method of using the liquid administration device 10 and an operating state at the time of use will be described with reference to FIGS.

  [1] As shown in FIGS. 1 and 2, a liquid administration device 10 in an unused state (initial state) is prepared. The liquid administration device 10 in the unused state is in the first state, that is, in the separated state, and the proximal end needle tip 23 of the double-ended needle 2 is separated from the sealing member 191 of the cylindrical body 17. The member 191 has not yet been pierced. Thereby, the aseptic state of the liquid can be maintained until the administration of the drug solution is started. Further, it is possible to prevent liquid from being discharged from the tip side needle tip 21 of the double-ended needle 2.

[2] Next, as shown in FIG. 3, the liquid administration device 10 is grasped, the liquid administration device 10 is moved in the distal direction at the puncture position of the living body, and the distal needle tip 21 of the double-ended needle 2 is placed on the living body. Puncture. When the distal end surface of the support member 9 comes into contact with the living body and the puncture of the double-ended needle 2 into the living body is completed, subsequently, the support member 9 moves in the proximal direction against the biasing force of the elastic member 5, As a result, the proximal needle tip 23 of the double-ended needle 2 pierces the sealing member 191, and thus the double-ended needle 2 that has punctured the living body and the cylindrical body 17 communicate with each other. That is, the liquid administration device 10 is in the second state (puncture state).

  [3] Next, as shown in FIG. 4, the plunger 18 is pressed in the distal direction. Accordingly, the gasket 3 is pressed and moved toward the distal end by the plunger 18, and the liquid in the cylindrical body 17 is discharged from the double-ended needle 2 to administer the liquid to the living body. Then, when the administration of the liquid to the living body is completed, the double-ended needle 2 is removed from the living body. As a result, the support member 9 (puncture needle 50) urged in the distal direction by the elastic member 5 moves in the distal direction by the urging force of the elastic member 5, and the proximal end needle tip 23 of the double-ended needle 2. Is removed from the sealing member 191 to be in the first state.

  [4] Here, during the administration of the liquid, there is a case where it is desired to temporarily interrupt the administration of the liquid, for example, when the pain due to the liquid is strong. In this case, the double-ended needle 2 is removed from the living body. As a result, the support member 9 is moved in the distal direction by the urging force of the elastic member 5, and the proximal needle tip 23 of the double-ended needle 2 is removed from the sealing member 191 to be in the first state (FIG. 2). reference). Thereby, it is possible to prevent liquid from being discharged from the tip side needle tip 21 of the double-ended needle 2.

  Thereafter, for example, after the pain disappears, [2] and [3] are performed, and the liquid administration is resumed.

  As described above, according to the liquid administration device 10, when the liquid administration is temporarily interrupted, for example, when the pain due to the liquid is strong, the liquid is discharged from the tip side needle tip 21 of the double-ended needle 2. Can be prevented. In addition, administration of the liquid can be resumed.

  Similarly, when the liquid filled in the cylindrical body 17 is administered in a plurality of times, the tip side of the tip of the double-ended needle 2 is completed until the prescribed administration is completed and the next administration is performed. It is possible to prevent liquid from being discharged from 21.

  Thereby, it is possible to prevent the liquid from being wasted or insufficient, and a sufficient amount of the liquid can be administered to the living body.

  When the double-ended needle 2 is punctured into the living body, the distal end needle tip 21 of the double-ended needle 2 punctures the living body, and then the proximal end needle tip 23 of the double-ended needle 2 pierces the sealing member 191 and the double-ended needle. Since 2 communicates with the lumen of the cylinder 17, the liquid in the cylinder 17 can be used without waste.

  When the double-ended needle 2 is removed from the living body when the liquid administration is temporarily interrupted, the proximal needle tip 23 of the double-ended needle 2 is removed from the sealing member 191, and the double-ended needle 2 is removed from the cylindrical body 17. Since the tip side needle tip 21 of the double-ended needle 2 is removed from the living body after it is no longer communicated with the lumen, the liquid in the cylindrical body 17 can be used without waste.

  In addition, the dimension of the elastic member 5 is not specifically limited, For example, the diameter may be further larger and may be further smaller. Further, the number of elastic members 5 is not limited to one and may be plural.

  Moreover, as an elastic member, it is not limited to the thing of the structure mentioned above, For example, a coil spring etc. are mentioned.

Second Embodiment
FIG. 6 is a side view showing a second embodiment of the liquid administration device of the present invention. 7 is a longitudinal sectional view of the liquid administration device shown in FIG. 6, FIG. 7 (a) is an overall longitudinal sectional view, and FIG. 7 (b) is an enlarged longitudinal sectional view of the distal end portion of the liquid administration device, FIG. 7C is a longitudinal sectional view of the vicinity of the needle tip of the needle tube. 8 and FIG. 9 are diagrams for explaining the operation when using the liquid administration device shown in FIG. 6, respectively. FIG. 8 (a) and FIG. 9 (a) are respectively a side view and a diagram. 8 (b) and FIG. 9 (b) are longitudinal sectional views, respectively, and FIG. 8 (c) and FIG. 9 (c) are enlarged longitudinal sectional views of the distal end portion of the liquid administration device, respectively.

  In the following description, the upper side in FIGS. 6 to 9 is referred to as “base end (rear end)”, the lower side is referred to as “tip”, and the vertical direction is referred to as “axial direction” or “longitudinal direction”.

  Hereinafter, the second embodiment will be described with a focus on the differences from the first embodiment described above, and the description of the same matters will be omitted.

  As shown in FIGS. 6 and 7, the liquid administration device 10 of the second embodiment includes an elastic member 7 as a liquid stopper mechanism.

  The elastic member 7 has a columnar shape and can be expanded and contracted. Further, the shape of the elastic member 7 in plan view is circular in this embodiment. In addition, a hole 71 that opens to the base end is formed at the base end of the elastic member 7. Thereby, the elastic member 7 can expand and contract easily. In the present embodiment, the outer diameter of the elastic member 7 gradually increases from the intermediate portion toward the distal end side, and gradually increases from the intermediate portion toward the proximal end side.

  The elastic member 7 is installed at the tip of the cylindrical body 17. That is, the elastic member 7 is disposed concentrically with the needle tube 2 a on the outer peripheral side of the needle tube 2 a, and the base end portion of the elastic member 7 is fixed to the wall portion 174 of the cylindrical body 17 by the fixing member 193. The distal end surface of the elastic member 7 is a contact surface that comes into contact with the surface of the living body when liquid is administered to the living body.

  In the unused state (initial state), the elastic member 7 is in the first state shown in FIGS. 6 and 7 and is in a natural state where no external force is applied. In this first state, the elastic member 7 covers and seals the needle tip 25 of the needle tube 2a, thereby preventing inadvertent leakage of the liquid from the needle tube 2a.

  In the second state shown in FIG. 3, the elastic member 7 is contracted in the axial direction of the needle tube 2 a, and the needle tip 25 of the needle tube 2 a protrudes from the tip of the elastic member 7.

  That is, in the second state, the elastic member 7 contracts due to a reaction force when the distal end surface is pressed against the surface of the living body, and the needle tip 25 of the needle tube 2a protrudes from the distal end surface of the elastic member 7. Further, when the pressing of the distal end surface of the elastic member 7 to the surface of the living body is released, the elastic member 7 expands by its elastic force, seals the needle tip 25 of the needle tube 2a, and switches to the first state. .

  In addition, as a constituent material of the elastic member 7, what was mentioned as a constituent material of the said elastic member 5, etc. can be used, for example.

  The elastic member 7 is fixed to the distal end portion of the cylindrical body 17 by a fixing member 193. The fixing member 193 is a cylindrical member whose axial length is relatively short. The fixing member 193 is fitted to the wall portion 174 and the elastic member 7 from the front end side and the outer peripheral side of the wall portion 174, and fixes the elastic member 7 to the cylindrical body 17. Thereby, the detachment | leave from the cylinder 17 of the elastic member 7 is prevented reliably. The fixing method of the fixing member 193 is not particularly limited, and may be a method using adhesion or a method using welding.

  A puncture needle 50 composed of a needle tube 2a is disposed at the distal end of the cylindrical body 17. The needle tube 2 a is fixed to the mouth portion 173 of the cylindrical body 17 at the base end portion thereof and communicates with the cylindrical body 17.

  The needle tube 2 a is a hollow needle, has a sharp needle tip 25 at the tip, and can puncture a living body with the needle tip 25.

  Further, when the needle member 25 of the needle tube 2a pierces (punctures) the elastic member 7 with the needle tip 25, a part of the elastic member 7 is clogged in the flow path 22 (lumen part) of the needle tip 23, That is, it has a function of preventing coring. Specifically, the external shape of the needle tip 25 of the needle tube 2a is the same shape as the proximal end needle tip 23 of the double-ended needle 2 of the first embodiment.

  Thereby, when the liquid administration is temporarily interrupted and then the liquid administration is resumed, or when the liquid filled in the cylindrical body 17 is divided into a plurality of times, the needle tip 25 of the needle tube 2a is used. However, even if the elastic member 7 is pierced many times, the coring of the needle tube 2a can be prevented and the liquid can be reliably administered.

  Note that the structure of the needle tip 25 of the needle tube 2a having the function of preventing the coring is not limited to the above structure, as in the first embodiment, and, for example, FIG. 7 (c) and FIG. The structures shown in (a), FIG. 5 (b), FIG. 5 (c), FIG. 5 (d), FIG. 5 (e), FIG. 5 (f), and FIG. Preferably, the structure shown in FIG.

  Next, a method of using the liquid administration device 10 and an operating state at the time of use will be described with reference to FIGS.

  [1] As shown in FIGS. 6 and 7, a liquid administration device 10 in an unused state (initial state) is prepared. This unused liquid administration device 10 is in the first state, and the needle tip 25 of the needle tube 2 a is sealed by the elastic member 7. Thereby, the aseptic state of the liquid can be maintained until the administration of the drug solution is started. Further, it is possible to prevent the liquid from being discharged from the needle tip 25 of the needle tube 2a.

  [2] Next, as shown in FIG. 8, the liquid administration tool 10 is gripped, and the distal end surface of the elastic member 7 is brought into contact with the surface of the living body at the puncture position of the living body to resist the elastic force of the elastic member 5. Then, the liquid administration device 10 is moved in the distal direction, and the needle tip 25 of the needle tube 2a is punctured into the living body. At this time, the elastic member 7 contracts in the axial direction, and the needle tip 25 of the needle tube 2a protrudes from the tip of the elastic member 7 to be in the second state.

  [3] Next, as shown in FIG. 9, the plunger 18 is pressed in the distal direction. Thereby, the gasket 3 is pressed and moved toward the distal end by the plunger 18, the liquid in the cylindrical body 17 is discharged from the needle tube 2a, and the liquid is administered to the living body. Then, when the administration of the liquid to the living body is completed, the needle tube 2a is removed from the living body. Thereby, the elastic member 7 is extended in the axial direction by the elastic force, and the needle tip 25 of the needle tube 2a is sealed by the elastic member 7 to be in the first state.

  [4] Here, during the administration of the liquid, there is a case where it is desired to temporarily interrupt the administration of the liquid, for example, when the pain due to the liquid is strong. In this case, the needle tube 2a is removed from the living body. Thereby, the elastic member 7 is extended in the axial direction by the elastic force, and the needle tip 25 of the needle tube 2a is sealed by the elastic member 7 to be in the first state (see FIG. 7). Thereby, it is possible to prevent the liquid from being discharged from the needle tip 25 of the needle tube 2a.

Thereafter, for example, after the pain disappears, [2] and [3] are performed, and the liquid administration is resumed.
According to this liquid administration device 10, the same effect as the first embodiment described above can be obtained.

<Third Embodiment>
10 to 17 are side views (partially cut-out views) sequentially illustrating the operating states when the third embodiment of the liquid administration device of the present invention is used. 18 to 25 are longitudinal sectional views of the liquid administration device in the state shown in FIGS. 10 to 17, respectively. FIG. 26 is an exploded perspective view showing the positional relationship between the operating member and the regulating member provided in the liquid administration device of the present invention. FIG. 27 is an exploded perspective view showing the positional relationship between the regulating member and the cover member provided in the liquid administration device of the present invention. FIG. 28 is a view of the regulating member provided in the liquid administration device of the present invention as seen from the distal end side. FIG. 29 is a perspective view showing a puncture needle provided in the liquid administration device of the present invention.

  In the following description, the upper side in FIGS. 10 to 27 and 29 will be described as “base end (rear end)”, the lower side as “tip”, and the vertical direction as “axial direction” or “longitudinal direction”.

  Hereinafter, the third embodiment will be described with a focus on differences from the first embodiment described above, and descriptions of the same matters will be omitted.

  As shown in FIGS. 10 to 25, the liquid administration device 10 of the third embodiment includes an inner cylinder (tubular body) 1, a puncture needle 50 composed of a double-ended needle 2 and a support member 9, and an inner cylinder 1. A gasket 3 slidable inside, an operation member 8 connected to the base end side of the gasket 3, a restriction member 4 for restricting the operation of the operation member 8, and a cover member arranged on the outer peripheral side of the inner cylinder 1 6, a coil spring 60 that is a biasing member that biases the cover member 6 toward the distal end, an auxiliary mechanism 40, and the elastic member 5. The elastic member 5 is the same as that in the first embodiment, and a description thereof will be omitted.

  The inner cylinder 1 has a member having a bottom 12 and a side wall 13 erected from an edge of the bottom 12 at the tip, that is, an inner cylinder main body 14 constituted by a member having a bottomed cylindrical shape. Yes. The inner cylinder 1 can be filled with liquid.

The bottom portion 12 has a mortar shape, and a mouth portion 121 through which a liquid passes is formed through the center portion.
The side wall 13 has a cylindrical shape.

  Further, the inner cylinder 1 has a sealing member (sealing part) 15 for liquid-tightly sealing the mouth part 121 of the inner cylinder main body 14 and a fixing member 16 for fixing the sealing member 15 from the distal end side. doing.

  The sealing member 15 is formed of a disk-shaped elastic piece, and a ring-shaped recess 151 is formed on the base end surface thereof. A ring-shaped convex portion 122 protruding from the mouth portion 121 of the inner cylinder main body 14 can be fitted into the concave portion 151 in a liquid-tight manner. Thereby, the sealing member 15 can be mounted on the mouth portion 121 of the inner cylinder main body 14 and the mouth portion 121 can be sealed in a liquid-tight manner.

  The fixing member 16 is a ring-shaped member. The fixing member 16 is fitted to the sealing member 15 from the outer peripheral side, and the sealing member 15 is sandwiched between the fixing member 16 and the convex portion 122, whereby the sealing member 15 is attached to the inner cylinder main body 14. It can be securely fixed. Thereby, the detachment | leave from the inner cylinder main body 14 of the sealing member 15 is prevented reliably. The method for fixing the fixing member 16 is not particularly limited, but may be a method using adhesion or a method using welding.

  Moreover, it does not specifically limit as a constituent material of the inner cylinder main body 14, the fixing member 16, the cover member 6, the support member 9, the operation member 8, and the control member 4, For example, in 1st Embodiment, the structure of the cylinder 17 Those listed as materials can be used. For the other members, the same constituent materials as the corresponding members in the first embodiment can be used.

  A puncture needle 50 is disposed on the distal end side of the inner cylinder 1. The double-ended needle 2 of the puncture needle 50 is attached to the inner cylinder 1 via a support member 9. The support member 9 supports the double-ended needle 2 so as to be movable along the central axis direction with respect to the inner cylinder 1. The support member 9 includes a fixed portion (support portion) 91 having a disk shape and a wall portion 92 erected from the edge of the fixed portion 91 toward the proximal direction.

  The fixing portion 91 can support and fix the double-ended needle 2 at the center thereof. The portion supported by the fixing portion 91 of the double-ended needle 2 is in the middle of the double-ended needle 2 in the longitudinal direction.

  The wall portion 92 is a ring-shaped portion along the edge of the fixed portion 91. As shown in FIG. 18, a plurality of engaging portions (second engaging portions) 921 projecting inward are formed on the inner peripheral portion of the base end of the wall portion 92. The engaging portions 921 are arranged at equal intervals along the circumferential direction of the wall portion 92. Each engaging portion 921 is a first engaging portion 123 or a second engaging portion that is formed by being recessed in the edge portion of the bottom portion 12 of the inner cylinder 1 according to the position of the puncture needle 50 with respect to the inner cylinder 1. Can be engaged with the engaging portion 124 (see FIGS. 18 and 21). The puncture needle 50 is in the inner state in any state where each engaging portion 921 engages with the first engaging portion 123 and each engaging portion 921 engages with the second engaging portion 124. The separation from the tip of the tube 1 is prevented.

  When the support member 9 (puncture needle 50) is located at the non-communication position, that is, in the separated state, each engagement portion 921 is engaged with the first engagement portion 123, and the support member 9 Is prevented from moving in the distal direction, and the support member 9 is prevented from being detached from the distal end portion of the inner cylinder 1. In the piercing state, each engaging portion 921 is engaged with the second engaging portion 124.

  The gasket 3 is accommodated so as to be slidable along the axial direction of the inner cylinder 1. Note that a space surrounded by the gasket 3 and the inner cylinder 1 is filled with a liquid in advance. The liquid in the inner cylinder 1 can be pushed out from the double-ended needle 2 that is in communication with the inner cylinder 1 by moving the gasket 3 toward the distal direction.

  In addition, a recess 33 is formed in the proximal end surface of the gasket 3 so that the distal end portion of the plunger 82 of the operation member 8 is inserted (fitted) and connected.

  The operation member 8 is a member that performs a pressing operation (discharging operation) in which the gasket 3 is pressed toward the distal end to discharge the liquid from the double-ended needle 2. The operation member 8 includes an operation member main body 8a coupled to the gasket 3 and a grip member (grip portion) 8b gripped when a pressing operation is performed.

  As shown in FIG. 26, the operation member main body 8 a includes a top plate 81 having a disk shape, and a plunger 82 that is formed on the lower surface of the top plate 81 so as to protrude in a columnar shape.

  On the edge side of the top plate 81, a plurality of claw portions 83 formed from the top plate 81 toward the distal end are arranged. Then, by engaging each claw portion 83 with a rib 851 formed in a ring shape along the circumferential direction of the outer peripheral portion 85 of the cylindrical holding member 8b, the operation member main body 8a and the holding member 8b Are fixed to each other (see FIGS. 10 and 19). Then, when operating the operation member 8, for example, the index finger to the little finger of one hand is hung on the outer peripheral portion 85 of the gripping member 8b, and the thumb is hung on the top plate 81 of the operation member main body 8a. Can be done.

  As shown in FIGS. 18 to 25, in the liquid administration device 10, a cylindrical regulating member 4 is disposed on the outer peripheral side of the inner cylinder 1, and a cylindrical cover member 6 is formed on the outer peripheral side of the regulating member 4. Is arranged. These members are arranged concentrically. Further, the regulating member 4 is supported so as to be rotatable around its central axis with respect to the inner cylinder 1, and the cover member 6 is supported so as to be movable along the central axis direction with respect to the inner cylinder 1. .

  The cover member 6 includes a first position (see FIGS. 10, 11, 18, and 19), a second position (see FIGS. 12 to 15 and FIGS. 20 to 23), and a third position (see FIGS. 16 and FIG. 24). In the first position, the cover member 6 can cover at least the tip side needle tip 21 of the double-ended needle 2. Thereby, it is possible to reliably prevent erroneous puncture by the tip side needle tip 21 and damage to the tip side needle tip 21. Further, at the second position moved (retracted) from the first position in the proximal direction, the distal needle tip 21 is exposed. Thereby, the living body can be punctured with the tip side needle tip 21. Further, at the third position moved in the distal direction from the second position, at least the distal needle tip 21 of the double-ended needle 2 can be covered again, and movement to the second position is prevented.

  The cover member 6 is urged by the urging force of the coil spring 60 in the direction of moving from the second position to the first position (third position).

  As shown in FIGS. 18 to 24, the coil spring 60 is housed in the cover member 6 in a compressed state. The coil spring 60 has a distal end 601 in contact with the ring-shaped distal end wall 63 of the cover member 6, and a proximal end 602 in contact with the rib 43 of the inner cylinder 1. And between these, the coil spring 60 is compressed. Thereby, the cover member 6 can be reliably urged in the direction from the second position toward the first position. By such an urging force of the coil spring 60, the tip side needle tip 21 of the puncture needle 50 can be covered with the cover member 6 before and after the liquid administration device 10 is used. Can be reliably prevented.

  Further, the restricting member 4 can take a pressing operation restricting state (see FIGS. 18 and 19) and a pressing operable state (see FIGS. 21 to 23) with respect to the operating member 8. The pressing operation restriction state is a state in which the pressing operation by the operation member 8 can be restricted when the cover member 6 is in the first position. The pressing operation possible state is a state in which the pressing operation by the operation member 8 is enabled (allowed) when the cover member 6 moves from the first position to the second position.

  Furthermore, the regulating member 4 has a first movable state (see FIGS. 10 to 12), a second movable state (see FIG. 15), and a movement restricted state (see FIG. 16) with respect to the cover member 6. And can take. The movable state is a state in which the cover member 6 is allowed (allowed) to move from the first position to the second position. The second movable state is a state that allows (allows) the cover member 6 to move from the second position to the third position in conjunction with the completion of the pressing operation. The movement restricting state is a state in which the cover member 6 is temporarily retracted to the second position, moved to the third position, and then moved to the second position again.

Hereinafter, a configuration for taking these states will be described.
As shown in FIGS. 26 and 27, a rib 41 formed in a ring shape protrudes from the proximal end portion of the inner peripheral portion of the regulating member 4 (one member) along the circumferential direction. The rib 41 is formed with a plurality (two in the present embodiment) of inner protrusions (inner follower portions) 42 that protrude toward the inner side and serve as slider portions. These inner protrusions 42 are arranged at equal intervals along the circumferential direction of the rib 41 (inner peripheral part of the regulating member 4).

  Further, a rib 43 formed in a ring shape projects along the circumferential direction of the outer peripheral portion in the middle of the axial direction on the outer peripheral portion of the regulating member 4. The rib 43 is formed with a plurality (two in the present embodiment) of outer protrusions (outer follower portions) 44 protruding outward, which serve as outer slider portions positioned outside the inner protrusion 42. Has been. These outer protrusions 44 are arranged at equal intervals along the circumferential direction of the rib 43 (the outer peripheral portion of the regulating member 4).

  Further, a pair of hooks 46 are formed on the outer peripheral portion of the regulating member 4. Each hook 46 is disposed between the rib 41 and the rib 43, and is disposed at equiangular intervals along the circumferential direction of the regulating member 4.

  As shown in FIG. 26, the plunger 82 (the other member) disposed concentrically with the regulating member 4 on the inner side of the regulating member 4 has an inner rail portion (inside rail portion) on which the inner protrusion 42 slides on the outer peripheral portion. The same number of inner grooves (inner cam grooves) 84 as the inner protrusions 42 are formed as rail portions. A plurality of these inner grooves 84 are arranged so as to correspond to the respective inner protrusions 42, and one corresponding inner protrusion 42 is inserted.

  Note that the number of the inner protrusions 42 and the inner groove portions 84 may be one, but it is preferable that there are a plurality as in the present embodiment. Thereby, the regulating member 4 can be stably rotated.

  Since the configuration of each inner groove portion 84 is the same, one inner groove portion 84 will be representatively described.

  The inner groove portion 84 includes an inner vertical groove (longitudinal rail) 841, an inner horizontal groove (lateral rail) 842, and an inner inclined groove 843.

  The inner longitudinal groove 841 is formed in the same direction as the operation direction during the pressing operation by the operation member 8, that is, along the axial direction (longitudinal direction) of the plunger 82.

  The inner lateral groove 842 is formed in a direction perpendicular to the operation direction during the pressing operation, that is, along the circumferential direction of the plunger 82. The inner lateral groove 842 intersects the middle of the inner longitudinal groove 841 in the longitudinal direction, that is, communicates (continuously).

  The inner inclined groove 843 is formed along a direction inclined with respect to the axial direction of the plunger 82. The inner inclined groove 843 has a tip portion intersecting with a base end portion of the inner longitudinal groove 841.

  The inner lateral grooves 842 of the adjacent inner groove portions 84 communicate with each other, and the inner lateral grooves 842 of the four inner groove portions 84 constitute a ring-shaped groove as a whole.

  As shown in FIGS. 18 and 19, when the cover member 6 is in the first position, the inner protrusion 42 is positioned in the inner lateral groove 842. Thereby, it will be in the press operation control state which controls the press operation by the operation member 8. FIG.

  As shown in FIGS. 21 to 23, when the cover member 6 moves from the first position to the second position against the biasing force of the coil spring 60, the inner protrusion 42 is interlocked with the movement. Is moved from the inner horizontal groove 842 to the inner vertical groove 841, and the inner vertical groove 841 (including the intersection between the inner vertical groove 841 and the inner horizontal groove 842, and the intersection between the inner vertical groove 841 and the inner inclined groove 843). Located in. As a result, a pressing operation enabling state in which the pressing operation by the operation member 8 is possible is obtained. Note that the movement of the inner protrusion 42 from the inner lateral groove 842 to the inner vertical groove 841 is performed by the rotation of the restriction member 4, and the rotational force is applied to the cover member described later by the outer protrusion 44 of the restriction member 4. It is generated by moving the outer groove 61 of the six.

  As shown in FIG. 24, until the cover member 6 returns from the second position to the first position by the biasing force of the coil spring 60, the inner protrusion 42 moves from the inner longitudinal groove 841 to the inner inclined groove 843. The inner inclined groove 843 is advanced. Also at this time, the regulating member 4 rotates in the same direction as described above.

  A pair of hooks 821 are formed on the outer peripheral portion of the base end portion of the plunger 82. The hooks 821 are arranged at equiangular intervals along the circumferential direction of the plunger 82.

  As shown in FIG. 27, the cover member 6 is formed with the same number of outer grooves (outer cam grooves) 61 as the outer protrusions 44 as outer rail parts on which the outer protrusions 44 slide. A plurality of these outer groove portions 61 are arranged so as to correspond to the respective outer protrusions 44, and one corresponding outer protrusion 44 is inserted.

  The number of the outer protrusions 44 and the outer groove portions 61 may be one, but it is preferable that there are a plurality of outer protrusions 44 and outer groove portions 61 as in this embodiment. Thereby, coupled with the plurality of inner protrusions 42 and inner groove portions 84, the restricting member 4 can be rotated more stably.

  Since the configuration of each outer groove 61 is the same, one outer groove 61 will be representatively described.

  The outer groove 61 includes a first outer vertical groove (first outer vertical rail) 611, a second outer vertical groove (second outer vertical rail) 612, a third outer vertical groove 613, The first outer inclined groove (outer inclined rail) 614, the second outer inclined groove 615, the outer lateral groove (outer lateral rail) 616, and the outer engaging portion 617 are configured. The first outer longitudinal groove 611 to the outer lateral groove 616 are through-holes penetrating from the inner peripheral portion to the outer peripheral portion of the cover member 6, that is, through the wall portion of the cover member 6 having a cylindrical shape.

  The first outer longitudinal groove 611 is formed in the same direction as the operation direction during the pressing operation by the operation member 8, that is, along the axial direction of the plunger 82.

  The second outer longitudinal groove 612 is located away from the first outer longitudinal groove 611 along the circumferential direction of the plunger 82 in the direction opposite to the operation direction during the pressing operation, that is, the first It is formed in parallel with the outer longitudinal groove 611.

  The third outer longitudinal groove 613 is formed between the first outer longitudinal groove 611 and the second outer longitudinal groove 612 in the direction opposite to the operation direction during the pressing operation.

  The first outer inclined groove 614 is formed between the first outer vertical groove 611 and the third outer vertical groove 613 along a direction inclined with respect to the operation direction during the pressing operation. The distal end of the first outer inclined groove 614 intersects with the distal end of the third outer longitudinal groove 613, and the proximal end intersects with the distal end of the first outer longitudinal groove 611.

  The second outer inclined groove 615 is formed along a direction inclined with respect to the operation direction at the time of the pressing operation, and the distal end thereof intersects with the base end portion of the first outer vertical groove 611.

  The outer lateral groove 616 is formed between the second outer longitudinal groove 612 and the third outer longitudinal groove 613 along a direction perpendicular to the operation direction during the pressing operation. One end of the outer lateral groove 616 intersects the base end of the second outer longitudinal groove 612, and the other end is the distal end of the third outer longitudinal groove 613 and the distal end of the first outer inclined groove 614. Intersects.

  The outer engaging portion 617 is an elastic piece formed by a part of the wall portion of the cover member 6 that defines the second outer longitudinal groove 612. The outer engagement portion 617 is disposed at the proximal end portion of the second outer longitudinal groove 612, and can be engaged with the outer protrusion 44 from the distal end side when the cover member 6 returns to the first position. Yes (see FIG. 16). Further, the outer engagement portion 617 formed of an elastic piece can be elastically deformed, and therefore, when the cover member 6 is moved from the second position to the third position, the outer protrusion 44 is moved. The outer engagement portion 617 can be exceeded, and thus its movement can be allowed.

  As shown in FIGS. 10 to 12, the outer protrusion 44 can sequentially move the second outer inclined groove 615, the first outer vertical groove 611, and the first outer inclined groove 614. As a result, the cover member 6 is in a first movable state in which the cover member 6 can move from the first position to the second position.

  Further, when the outer protrusion 44 moves in the first outer inclined groove 614, the restricting member 4 can rotate. As described above, by this rotation, the inner protrusion 42 can move from the inner lateral groove 842 to the inner longitudinal groove 841, so that a pressing operation possible state in which a pressing operation by the operation member 8 is possible can be achieved.

  As shown in FIGS. 13 to 15, when the cover member 6 is in the second position, the outer protrusion 44 can move in the outer lateral groove 616. This movement is performed by the rotation of the regulating member 4, and the rotational force is generated when the inner protrusion 42 moves in the inner inclined groove 843.

  As shown in FIG. 15, when the outer protrusion 44 has moved in the outer lateral groove 616, the second outer vertical groove 612 can be moved subsequently. As a result, the cover member 6 enters a second movable state in which the cover member 6 can move from the second position to the third position.

  As shown in FIG. 16, when the cover member 6 moves from the second position to the third position, the outer protrusion 44 moves in the second outer longitudinal groove 612. The outer protrusion 44 is engaged with the outer engagement portion 617. Thereby, it will be in the movement control state in which the cover member 6 moves to the 2nd position again, but is controlled.

  Moreover, the outer side groove part 61 is a through-hole as mentioned above, and the outer side protrusion part 44 can be exposed. As shown in FIG. 16, in the movement restricted state, the outer protrusion 44 and the outer engagement portion 617 engaged with the outer protrusion 44 are covered with the gripping member 8 b of the operation member 8. Accordingly, it is possible to reliably prevent the engagement between the outer protrusion 44 and the outer engagement portion 617 from being unintentionally released, and thus it is possible for the cover member 6 to reliably remain in the first position. it can. The cover member 6 covers the tip side needle tip 21 and prevents erroneous puncture and the like.

  As shown in FIGS. 18 to 24, the puncture needle 50 can move along the axial direction with respect to the inner cylinder 1. And the regulating member 4 can also take the puncture needle movement regulation state which regulates the movement of the puncture needle 50 (support member 9), when the cover member 6 exists in a 1st position. Next, a configuration for taking this puncture needle movement restricted state will be described.

  As shown in FIG. 28, a plurality (four in this embodiment) of inner protrusions (second inner protrusions) 45 projecting inward are formed at the tip of the inner peripheral portion of the regulating member 4. ing. These inner protrusions 45 are arranged at equal intervals along the circumferential direction of the regulating member 4.

  As shown in FIG. 29, a plurality of step portions 922 are formed on the outer peripheral portion of the wall portion 92 of the support member 9 of the puncture needle 50. Each step portion 922 is formed so as to cause a step toward the outside in the outer peripheral portion of the wall portion 92.

  When the cover member 6 is in the first position, the inner protrusion 45 engages with each step 922 from the base end side (see “inner protrusion 45” shown by a solid line in FIG. 29). As a result, the movement of the puncture needle 50 is restricted, and the movement of the puncture needle 50 is restricted. Therefore, the double-ended needle 2 unintentionally pierces the sealing member 15 of the inner cylinder 1 before using the liquid administration device 10. This prevents liquid leakage from the double-ended needle 2.

  Then, when the restricting member 4 is rotated as described above from the puncture needle movement restricted state, the inner protrusions 45 are detached from the respective step portions 922 ("inner protrusion 45" indicated by a two-dot chain line in FIG. 29). Reference), the puncture needle movement restriction state is released. Thereby, the puncture needle 50 becomes movable to the proximal end side, and thus the double-ended needle 2 can pierce the sealing member 15 of the inner cylinder 1.

  The auxiliary mechanism 40 has a function of generating an auxiliary force that presses the gasket 3 via the plunger 82 of the operation member 8, that is, an auxiliary force that the operation member 8 presses the gasket 3. In the present embodiment, the auxiliary mechanism 40 is configured by a coil spring (tensile coil spring: biasing member) 401. In the extended state, the coil spring 401 has a base end portion hooked (fixed) on the hook 821 of the plunger 82 and a tip end portion hooked (fixed) on the hook 46 of the regulating member 4. As a result, the coil spring 401 biases the inner cylinder (tubular body) 1 and the operation member 8 in a direction approaching each other. That is, the coil spring 401 generates an auxiliary force that presses the gasket 3 in the distal direction via the plunger 82 of the operation member 8. Thereby, the operation member 8 can be easily moved in the distal direction.

  In addition, it does not specifically limit as a constituent material of the coil spring 401, For example, the material similar to the constituent material of the coil spring 60 can be used.

  Next, a method of using the liquid administration device 10 and an operating state at the time of use will be described with reference to FIGS.

  [1] The liquid administration device 10 in an unused state (initial state) shown in FIGS. 10 and 18 is prepared. In the unused liquid administration device 10, the cover member 6 is in the first position and covers the tip side needle tip 21 of the double-ended needle 2. In this unused state, the state where the tip side needle tip 21 is covered with the cover member 6 by the urging force of the coil spring 60 is maintained. Thereby, the erroneous puncture by the tip side needle tip 21 can be prevented reliably.

  As shown in FIG. 18, the liquid administration device 10 is in the first state, and the puncture needle 50 is such that the proximal end needle tip 23 of the double-ended needle 2 is separated from the sealing member 15 of the inner cylinder 1. The sealing member 15 is not yet pierced. The state in which the proximal end needle tip 23 is separated from the sealing member 15 of the inner cylinder 1 is reliably maintained by the restricting member 4 in the puncture needle movement restricting state. Thereby, the aseptic state of the liquid can be maintained until the administration of the liquid is started. Further, it is possible to prevent the liquid from being discharged from the needle tip 25 of the needle tube 2a.

  Further, in the restricting member 4, each inner protrusion 42 is positioned in the inner lateral groove 842 of the plunger 82 of the operation member 8, and the operation member 8 is in a pressing operation restriction state. Thereby, the pressing operation by the operating member 8 is restricted (cannot be performed).

  Further, the restricting member 4 has each outer protrusion 44 positioned in the second outer inclined groove 615 and is movable with respect to the cover member 6.

  [2] Next, the operation member 8 of the liquid administration device 10 in an unused state is gripped, and as shown in FIGS. 11 and 19, the tip wall 63 of the cover member 6 is brought into contact with the living body, The operating member 8 is pressed toward the distal direction. Accordingly, the cover member 6 starts to move from the first position to the second position against the urging force of the coil spring 60. In the movement process, each outer protrusion 44 advances through the second outer inclined groove 615. As a result, the regulating member 4 rotates and the puncture needle movement restriction state is released, so that the puncture needle 50 becomes movable to the proximal end side.

  [3] When the operation member 8 is further pressed toward the distal end from the state shown in FIG. 11, each outer protrusion 44 advances through the first outer longitudinal groove 611 (see FIG. 12), and the cover member 6 is moved. Move from the puncture prevention position to the puncture possible position. At this time, the distal needle tip 21 of the double-ended needle 2 protrudes from the opening 631 of the distal wall 63 of the cover member 6, and the living body is punctured with the distal needle tip 21 (see FIGS. 12 and 20). ).

  As the cover member 6 moves, the distal wall 63 of the cover member 6 starts to press the support member 9 of the puncture needle 50 toward the proximal direction (see FIG. 20).

  [4] When the operation member 8 is continuously pressed in the distal direction from the state shown in FIG. 12, each outer protrusion 44 advances through the first outer inclined groove 614 (see FIG. 13). As a result, the regulating member 4 rotates and the inner protrusion 42 moves to the inner longitudinal groove 841, and a pressing operation is possible (see FIG. 21).

  At this time, the distal wall 63 of the cover member 6 further presses the support member 9 of the puncture needle 50 toward the proximal direction. Thereby, the sealing member 15 of the inner cylinder 1 can be pierced by the proximal end needle tip 23 of the double-ended needle 2, so that the double-ended needle 2 that has punctured the living body and the inner cylinder 1 communicate with each other. It will be in a 2nd state (refer FIG. 21).

  As a result, the operating member 8 can move in the distal direction and the gasket 3 can move in the distal direction by the biasing force of the coil spring 401, that is, the auxiliary force.

  [5] Due to the urging force of the coil spring 401, the inner protrusion 42 advances in the inner vertical groove 841 and the inner inclined groove 843 in order, and the gasket 3 moves to the movement limit where it abuts against the bottom 12 of the inner cylinder 1. Can be discharged from the double-ended needle 2 (see FIGS. 22 and 23). Thereby, the administration of the liquid is completed.

  In addition, when the inner protrusion 42 advances through the inner inclined groove 843, the regulating member 4 rotates. Thereby, the outer side protrusion 44 advances the outer side horizontal groove 616, and reaches the 2nd outer side vertical groove 612 (refer FIG. 14, FIG. 15).

  [6] Next, as shown in FIGS. 16 and 24, the liquid administration device 10 is separated from the living body. As a result, the cover member 6 is urged toward the distal end by the urging force of the coil spring 60, and the outer protrusion 44 advances through the second outer longitudinal groove 612 and returns to the first position.

  At this time, the restricting member 4 can engage the outer engaging portion 617 with the outer engaging portion 617, and thus is in a movement restricting state with respect to the cover member 6. Thus, the movement of the cover member 6 to the second position again is reliably restricted, and erroneous puncture by the distal end side needle tip 21 is prevented.

  Further, the support member 9 (puncture needle 50) urged in the distal direction by the elastic member 5 moves in the distal direction by the urging force of the elastic member 5, and the proximal end needle tip 23 of the double-ended needle 2 is moved. It is removed from the sealing member 15 to be in the first state.

  Thus, in the liquid administration device 10, the liquid is administered after puncturing the living body. That is, the liquid administration device 10 can be used reliably in the order of “puncture” and “administration”. Therefore, it is possible to reliably prevent the pressing operation for discharging the liquid by the operation member 8 before the puncture is performed on the living body.

  [7] During the administration of the liquid, there is a case where it is desired to temporarily interrupt the administration of the liquid, for example, when the pain due to the liquid is strong. In this case, as shown in FIGS. 17 and 25, the double-ended needle 2 is removed from the living body. As a result, the support member 9 is moved in the distal direction by the urging force of the elastic member 5, and the proximal end needle tip 23 of the double-ended needle 2 is removed from the sealing member 15 to be in the first state. Thereby, it is possible to prevent liquid from being discharged from the tip side needle tip 21 of the double-ended needle 2. Further, since the inside of the inner cylinder 1 is sealed, the operation member 8 is not moved in the distal direction by the urging force of the coil spring 401. Further, the cover member 6 moves in the distal direction by the urging force of the coil spring 60 and returns to the first position.

Thereafter, for example, after the pain disappears, the above [2] to [6] are performed, and the liquid administration is resumed.
According to this liquid administration device 10, the same effect as the first embodiment described above can be obtained.

  In the liquid administration device 10, the movement of the operation member 8 in the distal direction can be assisted or moved in the distal direction by the urging force of the coil spring 401, that is, the assisting force. Thereby, for example, a user who is difficult to press the operation member 8 such as an elderly person or a woman with weak power, such as a rheumatic patient whose finger has pain or deformation, can easily and reliably administer the liquid. .

<Fourth embodiment>
FIGS. 30 to 37 are side views (partially cutaway views) sequentially illustrating the operating states of the liquid administration device according to the fourth embodiment of the present invention when in use. 37 to 45 are longitudinal sectional views of the liquid administration device in the state shown in FIGS. 30 to 37, respectively.

  In the following description, the upper side in FIGS. 30 to 45 is referred to as “base end (rear end)”, the lower side as “tip”, and the vertical direction as “axial direction” or “longitudinal direction”.

  Hereinafter, the fourth embodiment will be described with a focus on differences from the second and third embodiments described above, and description of similar matters will be omitted.

  As shown in FIGS. 30 to 45, the liquid administration device 10 of the fourth embodiment includes an elastic member 7 as a liquid stopper mechanism. Note that the elastic member 7 is substantially the same as that of the second embodiment, and a description thereof will be omitted.

  The elastic member 7 is installed at the distal end portion of the regulating member 4. That is, the elastic member 7 is disposed concentrically with the needle tube 2 a on the outer peripheral side of the needle tube 2 a, the proximal end portion of the elastic member 7 is disposed at the distal end portion of the regulating member 4, and the proximal end portion is the cover member 6. It is in contact with the tip wall 63.

  Further, the needle tube 2 a is fixed to the mouth portion 12 of the inner cylinder 1 at the base end portion thereof, and communicates with the cylinder body 17. The needle tube 2a can be fixed, for example, by filling the mouth portion 12 with an adhesive, resin, or the like (not shown).

  Next, the method of using the liquid administration device 10 and the operating state at the time of use will be described with reference to FIGS. 30 to 45, but most of them are the same as in the third embodiment, and thus the differences are mainly described. Explained.

  [1] The liquid administration device 10 in an unused state (initial state) shown in FIGS. 30 and 38 is prepared. In the unused liquid administration device 10, the cover member 6 is in the first position and covers the needle tip 25 of the needle tube 2a. In this unused state, the state in which the needle tip 25 is covered with the cover member 6 is maintained by the urging force of the coil spring 60. Thereby, the erroneous puncture by the needle tip 25 can be prevented reliably.

  As shown in FIG. 38, the liquid administration device 10 is in the first state, and the needle tip 25 of the needle tube 2a is sealed by the elastic member 7. Thereby, the aseptic state of the liquid can be maintained until the administration of the drug solution is started. Further, it is possible to prevent the liquid from being discharged from the needle tip 25 of the needle tube 2a.

  Further, in the restricting member 4, each inner protrusion 42 is positioned in the inner lateral groove 842 of the plunger 82 of the operation member 8, and the operation member 8 is in a pressing operation restriction state. Thereby, the pressing operation by the operating member 8 is restricted (cannot be performed).

  Further, the restricting member 4 has each outer protrusion 44 positioned in the second outer inclined groove 615 and is movable with respect to the cover member 6.

  [2] Next, as shown in FIG. 31 and FIG. 39, the distal end wall 63 of the cover member 6 is brought into contact with the living body by grasping the operation member 8 of the liquid administration device 10 in an unused state, The operating member 8 is pressed toward the distal direction. Accordingly, the cover member 6 starts to move from the first position to the second position against the urging force of the coil spring 60. In the movement process, each outer protrusion 44 advances through the second outer inclined groove 615. As a result, the restricting member 4 rotates and the puncture needle movement restriction state is released, so that the puncture needle 50 becomes movable to the proximal end side.

  [3] When the operation member 8 is further pressed toward the distal end from the state shown in FIG. 31, each outer protrusion 44 advances through the first outer longitudinal groove 611 (see FIG. 32), and the cover member 6 is moved. Move from the puncture prevention position to the puncture possible position. At this time, the elastic member 7 contracts in the axial direction, and the needle tip 25 of the needle tube 2a protrudes from the tip of the elastic member 7 to be in the second state (see FIG. 40). At this time, the needle tip 25 of the needle tube 2a projects from the opening 631 of the distal end wall 63 of the cover member 6, and the needle tip 25 is punctured with respect to the living body (see FIGS. 32 and 40).

  [4] When the operation member 8 is continuously pressed toward the distal end from the state shown in FIG. 32, each outer protrusion 44 advances through the first outer inclined groove 614 (see FIG. 33). As a result, the regulating member 4 rotates and the inner protrusion 42 moves to the inner longitudinal groove 841, and a pressing operation is possible (see FIG. 41).

  As a result, the operating member 8 can move in the distal direction and the gasket 3 can move in the distal direction by the biasing force of the coil spring 401, that is, the auxiliary force.

  [5] Due to the urging force of the coil spring 401, the inner protrusion 42 advances in the inner vertical groove 841 and the inner inclined groove 843 in order, and the gasket 3 moves to the movement limit where it abuts against the bottom 12 of the inner cylinder 1. Can be discharged from the needle tube 2a (see FIGS. 42 and 43). Thereby, the administration of the liquid is completed.

  In addition, when the inner protrusion 42 advances through the inner inclined groove 843, the regulating member 4 rotates. Thereby, the outer side protrusion 44 advances the outer side horizontal groove 616, and reaches the 2nd outer side vertical groove 612 (refer FIG. 34, FIG. 35).

  [6] Next, as shown in FIGS. 36 and 44, the liquid administration device 10 is separated from the living body. As a result, the cover member 6 is urged toward the distal end by the urging force of the coil spring 60, and the outer protrusion 44 advances through the second outer longitudinal groove 612 and returns to the first position.

  At this time, the restricting member 4 can engage the outer engaging portion 617 with the outer engaging portion 617, and thus is in a movement restricting state with respect to the cover member 6. Thus, the movement of the cover member 6 to the second position again is reliably restricted, and erroneous puncture by the distal end side needle tip 21 is prevented.

  The elastic member 7 extends in the axial direction by the elastic force, and the needle tip 25 of the needle tube 2a is sealed by the elastic member 7 to be in the first state.

  Thus, in the liquid administration device 10, the liquid is administered after puncturing the living body. That is, the liquid administration device 10 can be used reliably in the order of “puncture” and “administration”. Therefore, it is possible to reliably prevent the pressing operation for discharging the liquid by the operation member 8 before the puncture is performed on the living body.

  [7] During the administration of the liquid, there is a case where it is desired to temporarily interrupt the administration of the liquid, for example, when the pain due to the liquid is strong. In this case, as shown in FIGS. 37 and 45, the double-ended needle 2 is removed from the living body. Thereby, the elastic member 7 is extended in the axial direction by the elastic force, and the needle tip 25 of the needle tube 2a is sealed by the elastic member 7 to be in the first state. Thereby, it is possible to prevent the liquid from being discharged from the needle tip 25 of the needle tube 2a. Further, since the inside of the inner cylinder 1 is sealed by sealing the needle tip 25 of the needle tube 2a, the operating member 8 does not move in the distal direction by the urging force of the coil spring 401. Further, the cover member 6 moves in the distal direction by the urging force of the coil spring 60 and returns to the first position.

Thereafter, for example, after the pain disappears, the above [2] to [6] are performed, and the liquid administration is resumed.
According to this liquid administration device 10, the same effects as those of the second and third embodiments described above can be obtained.

  The liquid administration device of the present invention has been described based on the illustrated embodiment, but the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. can do. In addition, any other component may be added to the present invention.

  Further, the present invention may be a combination of any two or more configurations (features) of the above embodiments.

  In the above embodiment, the cylinder is preliminarily filled with the liquid. However, the present invention is not limited to this. For example, the cylinder is not initially filled with the liquid, and the cylinder is filled with liquid later. It may be filled and used.

  Moreover, in the said embodiment, although one urging | biasing member is a compression spring, in this invention, it is not restricted to this, For example, a tension spring etc. may be sufficient and things other than a spring may be sufficient.

  In the embodiment, the other biasing member is a tension spring. However, in the present invention, the present invention is not limited to this, and for example, a compression spring or the like may be used.

  Moreover, in the said embodiment, the inner side protrusion is formed in the control member of an operation member and a control member, and the inner side groove part in which an inner side protrusion is inserted is formed in the plunger of the operation member. In this invention, it is not limited to this, An inner side protrusion part may be formed in the plunger of an operation member, and the inner side groove part may be formed in the control member.

  Moreover, in the said embodiment, an outer side protrusion is formed in the restriction member of a restriction member and a cover member, and the outer side groove part in which an outer side protrusion is inserted is formed in the cover member. In this invention, it is not limited to this, An outer side protrusion part may be formed in a cover member, and the outer side groove part may be formed in the control member.

In the outer groove portion, the third outer longitudinal groove can be omitted.
In the above-described embodiment, the restriction member has been described as having a cylindrical shape, but the height direction of the cylinder may be short, and may be a disk shape (doughnut shape) having a hole substantially in the center. It is assumed that the “cylindrical” concept in the description of the restricting member of the book includes a disk shape.

  In addition, the outer rail portion and the inner rail portion are each configured with a groove in the above embodiment, but the outer slider portion and the inner slider portion are not limited to this as long as the outer slider portion and the inner slider portion can slide along the rail. The outer rail portion and the inner rail portion may each be constituted by a ridge (rib) or a step.

10 Liquid administration device 1 Inner cylinder (tubular body)
12 bottom part 121 mouth part 122 convex part 123 1st engaging part 124 2nd engaging part 13 side wall 133 inner peripheral part 14 inner cylinder main body 15 sealing member (sealing part)
151 concave portion 16 fixing member 17 cylindrical body 171 bottom portion 172 side wall 173 mouth portion 174 wall portion 175 flange 176 groove 177 stepped portion 18 plunger 181 main body portion 182 flange 183 connecting portion 191 sealing member 192, 193 fixing member 2 double needle 21 a needle Tip side needle tip (needle tip)
22 channel 23 proximal end needle tip 24, 26 opening 25 needle tip 3 gasket 31, 32 protrusion 33 recess 4 regulating member 41 rib 42 inner protrusion (inner follower portion)
43 Rib 44 Outer protrusion (outer follower)
45 Inner protrusion (second inner protrusion)
46 Hook 5 Elastic member 6 Cover member 61 Outer groove (outer cam groove)
611 First outer longitudinal groove (first outer longitudinal rail)
612 Second outer longitudinal groove (second outer longitudinal rail)
613 Third outer longitudinal groove 614 First outer inclined groove (outer inclined rail)
615 Second outer inclined groove 616 Outer lateral groove (outer lateral rail)
617 Outer engagement part 63 Tip wall part 631 Opening part 7 Elastic member 71 Hole 8 Operation member 8a Operation member body 8b Gripping member (gripping part)
81 Top plate 82 Plunger 821 Hook 83 Claw part 84 Inner groove part (Inner cam groove)
841 Inner vertical groove (longitudinal rail)
842 Inner lateral groove (lateral rail)
843 Inner inclined groove 85 Outer peripheral portion 851 Rib 9 Support member 91 Fixed portion (support portion)
92 Wall portion 921 Engaging portion 922 Stepped portion 95 Arm portion 951 Projection 50 Puncture needle 60 Coil spring 601 Tip 602 Base end

Claims (15)

A cylindrical body that can be filled with liquid,
A needle tube which is provided on the distal end side of the cylindrical body so as to communicate with or communicate with the cylindrical body and has a sharp needle tip at the distal end;
A gasket that can slide in the cylinder;
An operation member that performs a pressing operation of pressing the gasket toward the distal end and discharging the liquid filled in the cylindrical body through the needle tube;
A first state in which an elastic member is provided and the liquid is prevented from flowing through the lumen of the needle tube by elastic deformation of the elastic member; and a second state in which the liquid can flow through the lumen of the needle tube A liquid administration device comprising: a liquid stopping mechanism for switching to the state.   The liquid stop mechanism moves the needle tube in the axial direction of the needle tube by expansion and contraction of the elastic member, so that in the first state, the needle tube does not communicate with the cylinder, and in the second state, The liquid administration device according to claim 1, wherein the needle tube is configured to communicate with the cylindrical body. The needle tube is a double-ended needle,
A support member that supports the needle tube, and is disposed on the distal end side of the cylindrical body so as to be movable in the axial direction of the needle tube with respect to the cylindrical body;
A sealing member that is installed on the distal end side of the cylindrical body and seals an outlet of the liquid filled in the cylindrical body;
The support member includes a non-communication position where the proximal end of the needle tube does not pierce the sealing member due to expansion and contraction of the elastic member, and the needle tube does not communicate with the cylinder, and a proximal end of the needle tube The liquid administration device according to claim 2, wherein a needle tip on the side pierces the sealing member, and the needle tube moves to a communication position where the needle tube communicates with the cylindrical body.   The liquid administration device according to claim 3, further comprising a contact surface that contacts a surface of the living body when the liquid is administered to the living body at a distal end portion of the support member. In the second state, the support member moves in the proximal direction against the elastic force of the elastic member by a reaction force when the contact surface is pressed against the surface of the living body, and the base of the needle tube The needle tip on the end side pierces the sealing member, the needle tube communicates with the cylindrical body,
When the pressing of the contact surface against the surface of the living body is released, the elastic member is extended by its elastic force, the support member is moved in the distal direction by the elastic member, and the proximal end side of the needle tube is moved. The liquid administration device according to claim 4, wherein the needle tip does not pierce the sealing member, and the needle tube does not communicate with the cylindrical body, and switches to the first state.   The needle tip on the proximal end side of the double-ended needle has a function of preventing a part of the sealing member from being clogged in the lumen of the needle tip when the sealing member is punctured with the needle tip. Item 6. The liquid administration device according to any one of Items 3 to 5. The cylinder has a first engaging portion,
The support member has a second engagement portion that can engage with the first engagement portion,
7. The support member according to claim 3, wherein movement of the support member in a distal direction is prevented when the second engagement portion engages with the first engagement portion at the non-communication position. 2. A liquid administration device according to item 1.   The liquid administration device according to any one of claims 2 to 7, wherein the elastic member has a cylindrical shape and is disposed concentrically with the needle tube.   The liquid administration device according to any one of claims 2 to 8, wherein the elastic member biases the support member and the cylindrical body in a direction away from each other.   In the first state, the liquid stopper mechanism seals the needle tip with the elastic member, and in the second state, the elastic member contracts in the axial direction of the needle tube, and the tip of the elastic member The liquid administration device according to claim 1, wherein the needle tip is configured to protrude from the top.   A base end portion of the elastic member is disposed at a distal end portion of the cylindrical body, and has a contact surface that contacts the surface of the living body when the liquid is administered to the living body at the distal end portion of the elastic member. The liquid administration device according to claim 10. In the second state, the elastic member contracts due to a reaction force when the contact surface is pressed against the surface of the living body, and the needle tip protrudes from the contact surface,
12. When the pressing of the contact surface against the surface of the living body is released, the elastic member expands by its elastic force, seals the needle tip, and switches to the first state. Liquid dosing device.   13. The needle tip has a function of preventing a part of the elastic member from being clogged in a lumen portion of the needle tip portion when the elastic member is punctured with the needle tip. The liquid administration device according to Item.   The liquid administration device according to any one of claims 1 to 13, wherein the operation member includes an auxiliary mechanism that generates an auxiliary force for pressing the gasket.   The liquid administration device according to claim 14, wherein the auxiliary mechanism has a biasing member that biases the cylindrical body and the operation member in a direction in which they approach each other.

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