JP5734752B2 - Cartridge type syringe - Google Patents

Description

  The present invention relates to a cartridge type syringe that can be appropriately replaced every time it is used by configuring the filling portion of the content liquid as a cartridge.

  As a conventional cartridge type syringe, after a cartridge including a storage cylinder (syringe) having a nozzle and a piston is loaded into a main body cylinder (loading tool), the main body cylinder is integrated by fitting a lock pipe. (See, for example, Patent Document 1).

Japanese Patent No. 3747220

  However, in the conventional cartridge type syringe, a through hole leading to the nozzle is formed in the housing cylinder portion of the cartridge, and the piston is closely fitted to the rear end portion of the through hole, while the cap is tightly fitted to the tip portion of the nozzle. The dispensing is merely pushing the piston of the cartridge with the operating rod. For this reason, in the conventional cartridge type syringe, the content liquid cannot be sucked and injected from the outside.

  Further, in general, the piston can be pushed only directly through the operation rod, whereas the pulling out of the piston requires drawing the operation rod while holding the storage cylinder portion. For this reason, there is room for improvement in workability in sucking the content liquid. In addition, when a small amount of content liquid is to be poured out, it is preferable that the amount to be poured can be appropriately adjusted by the amount desired by the user.

  An object of the present invention is to provide a novel cartridge type syringe that allows the content liquid to be easily exchanged from the outside and allows easy adjustment of the amount to be dispensed while allowing the content liquid to be filled and replaced. There is to do.

The present invention includes a syringe and a cartridge that includes a piston member that is slidably held in a through-hole of the syringe, a loading tool that has a space for loading the cartridge and that has a passage that leads to the space, A cartridge-type syringe comprising a plunger capable of pushing a piston member through a passage of a loading device,
Provided is a sleeve member that is rotatably held between the front end side protrusion and the rear end side protrusion provided on the outer peripheral surface of the plunger at an interval in the axial direction and that can be accommodated in the passage of the loading device,
On the outer peripheral surface of the sleeve member, a projection is formed to fit the slit hole formed in the loading tool from the inside, and the sleeve member is advanced and retracted along the slit hole, and on the inner peripheral surface of the sleeve member, When the rear end protrusion provided on the plunger is joined, a key groove is formed that allows only the plunger to be pushed in . When the rear end protrusion provided on the plunger does not fit the key groove, the plunger The sleeve member is pushed onto the plunger by pushing in, and the sleeve member is pushed in,
An elastic member is provided between the sleeve member and the loading tool to give a restoring force against the pushing of the sleeve member,
The rear end portion of the piston member protruding from the rear end of the syringe and the front end portion of the plunger are each formed into a fitting shape that can be attached to and detached from each other.

  The rear end portion of the piston member and the front end portion of the plunger can be connected using various fitting shapes. For example, the cartridge loading port formed in the loading device is connected to the front end of the loading device. While forming with the opening part notched toward the rear end, while constituting the rear-end part of a piston member as a flange part, the narrow part which hooks a flange part can be provided in the front-end | tip part of a plunger. Further, the rear end portion of the piston member can be configured as an elastic tongue piece having a claw portion, and a narrow portion for hooking the claw portion can be provided at the distal end portion of the plunger.

  Further, the sleeve member can be formed on the outer peripheral surface thereof with a longitudinal rib which is joined from the inside to a groove portion formed in the loading tool and advances and retracts the sleeve member together with the plunger along the groove portion. Furthermore, it is preferable that the tip side protrusion provided on the plunger is configured as an elastic piece. Further, the protrusion provided on the sleeve member is also preferably configured as an elastic piece.

  In the present invention, the piston member can be advanced and retracted by the plunger by fitting the rear end of the piston member to the tip of the plunger. For this reason, the content liquid can be sucked from the outside by a simple operation of fitting the rear end of the piston member to the front end of the plunger.

  Further, since the plunger is held by the elastic member with respect to the loading tool via the sleeve member, the plunger automatically returns to the initial position only by releasing the finger after pushing the plunger. For this reason, the content liquid from the outside can be automatically sucked by a simple operation of releasing the finger after pushing the plunger.

  In addition, in the present invention, if the plunger is rotated clockwise or counterclockwise around the axis line so that the rear end side projection is aligned with the key groove, the plunger is moved along the key groove without depending on the elastic member. Can only be pushed in separately. For this reason, the user can appropriately pour out a desired amount of content liquid by adjusting the pushing amount of the plunger regardless of the biasing force of the elastic member.

  Therefore, according to the present invention, there is provided a novel cartridge type syringe that allows the content liquid to be sucked from the outside while allowing the content liquid to be filled and exchanged, and that the adjustment of the amount dispensed is easy. be able to.

(a) is a cartridge according to the first embodiment of the cartridge-type injector according to the present invention, and is a partial cross-sectional view showing a state at the time of distribution before use from the side, (b) It is sectional drawing which shows the needle part with which the cartridge which concerns on a form is mounted | worn from a side surface. It is a partial cross section figure which shows the state at the time of use of the cartridge based on the form from a side surface. It is a partial cross section figure which shows the operating instrument based on the form from the side. The loading device according to the embodiment, wherein (a) and (b) are a side view and a bottom view showing the loading device from above, respectively, and are an AA end surface and a BB end surface of (a). , CC end surface and DD end surface are shown together. (a) is a side view showing a plunger according to the same configuration, (b) is a side view showing a sleeve member according to the same configuration, and (c) is a bottom view of (b). (a) is the syringe which concerns on the same form, Comprising: It is the fragmentary sectional view which shows the initial state and suction state from upper direction, (b) is the EE sectional drawing. (a) is the syringe which concerns on the same form, Comprising: It is the fragmentary sectional view which shows the 1st pushing state from upper direction, (b) is the FF sectional drawing. (a) is the injection device which concerns on the same form, Comprising: It is the fragmentary sectional view which shows the 2nd pushing state from upper direction, (b) is the GG sectional drawing. (a) is a cartridge according to a second embodiment of the cartridge-type injector according to the present invention, and is a partial cross-sectional view showing a state in use from the side, and (b) is a bottom view of the main part thereof. FIG. It is a syringe based on the same form, Comprising: It is a fragmentary sectional view which shows the initial state from upper direction. It is a syringe based on the form, Comprising: It is a partial cross section figure which shows the pushing state from upper direction. It is a syringe based on the form, Comprising: It is a fragmentary sectional view which shows the suction state from upper direction.

  Hereinafter, with reference to drawings, various forms of a cartridge type syringe which is the present invention are explained in detail.

  1 to 8 show a first embodiment of the present invention. In FIG. 1 (a), reference numeral 1 is a disposable cartridge with an overcap C attached, and reference numeral 2 is a synthetic resin syringe filled with the content liquid. The syringe 2 has a body part 3 forming a waist (constricted part), a tip part 4 having a smaller outer diameter than the body part 3, and a rear end part 5 having a larger outer diameter than the body part 3. The part 4 is integrally provided with a cylindrical part 7 surrounding the tip part 4 via an annular wall 6.

In addition, the syringe 2 has a through hole 8 formed through the opening A ₁ formed at the front end 2a and the opening A ₂ formed at the rear end 2b. The through-hole 8 has a small-diameter hole 8a surrounded by the front end portion 4 and a large-diameter hole 8b surrounded by the trunk portion 3 and the rear end portion 5, and is interposed between the small-diameter hole 8a and the large-diameter hole 8b. Is formed with an enlarged diameter hole 8c. The diameter-enlarged hole 8c forms a step portion whose slope 8f expands from the small-diameter hole 8a toward the large-diameter hole 8b.

Reference numeral 10 denotes a synthetic resin piston member. The piston member 10 has a piston body 11 that is slidably held in the small-diameter hole 8a. The space R formed between the piston body 11 and the syringe 2 can be filled with the content liquid from the outside. it can. The piston body 11 is integrally provided with a guide portion 12 that guides the piston member 10. Guiding portion 12 surrounds the piston body 11, is composed of four thin plate-like member, a portion thereof is exposed from the opening A ₂ through the large diameter hole 8b.

  A rear end portion 13 of the piston member 10 is integrally provided at the lower end of the guide portion 12. The rear end 13 is shaped as a flange. Thereby, while the rear end 10b of the rear end part 13 functions as a pressing part for pushing the piston member 10, the front-end | tip 10a of the piston main body 11 functions as a pressurization surface which pumps a content liquid.

  In addition, the guide portion 12 has a hypotenuse 10f. The oblique side 10f forms a stepped portion whose diameter increases toward the rear end portion 13, and contacts the stepped portion of the syringe 2 (the inclined surface 8f of the diameter-expanded hole 8c) to restrict the pushing of the piston member 10. That is, the inclined surface 8f of the syringe 2 and the oblique side 10f of the piston member 10 also function as stoppers that restrict the pushing-in of the piston member 10 in order to discharge the content liquid by a certain amount. Such a configuration is useful for dispensing a certain amount of the content liquid. In addition, according to this invention, the step part (8f, 10f) of the syringe 2 and piston member 10 is not limited to an inclined surface, The thing comprised by the perpendicular | vertical surface is also included. Further, according to the present invention, when the piston member 10 is pushed into the syringe 2, the pushing amount can also be regulated by bringing the rear end portion 13 into contact with the rear end 2 b of the syringe 2.

Reference numeral 15 denotes a needle part made of synthetic resin that can be attached to the distal end portion 4 of the syringe 2. The needle part 15 includes a needle 16 and a needle holder 17 as shown in FIG. The needle holder 17 has an opening A ₃ at the lower end thereof, and is formed with a recess 17n that allows the needle holder 17 to communicate with the outside through the opening A ₃ . Thus, the needle holder 17, through the opening A _3, the tip 4 of the syringe 2 can be fitted and held in the recess 17n.

  Furthermore, the needle holder 17 is provided with a flange portion 17 s that is screwed into a screw portion 7 s formed inside the cylindrical body portion 7 of the syringe 2. The flange portion 17s functions as a screw portion. Thereby, the needle part 15 can be attached to the cartridge 1 by screwing the needle holder 17 into the syringe 2 as shown in FIG.

  Next, reference numeral I in FIG. 3 is an example of an operating instrument to which the cartridge 1 according to the present invention can be applied, and reference numeral 20 is a synthetic resin loading tool that accommodates the cartridge 1. As shown in FIG. 4, the loading tool 20 has a peripheral wall 21 that surrounds the axis O, and a through hole 22 is formed inside thereof. The through-hole 22 also has a small-diameter hole 22a, a large-diameter hole 22b having a larger inner diameter than the small-diameter hole 22a, and a medium-diameter hole 22c formed therebetween, and between the small-diameter hole 22a and the medium-diameter hole 22c. A step portion 22d extending perpendicularly (diameter direction) to the axis O is formed.

In addition, a loading port A ₄ for loading the cartridge 1 is formed in the peripheral wall 21. In this embodiment, as shown in FIG. 4, the loading port A ₄ includes an opening cut out in the direction of the axis O from the tip 20a of the loading tool 20 to the medium diameter hole 22c. Thus, the peripheral wall 21 forming the small diameter hole 22a and the medium diameter hole 22c has a C-shaped cross section as shown by the AA end face.

  Further, in the direction of the axis O, the convex portion 23 is formed and extends around the axis O as shown by the DD end face. That is, the inner peripheral surface of the peripheral wall 21 that forms the small-diameter hole 22a is configured as an arc-shaped convex portion 23 that protrudes radially inward from the inner peripheral surface of the peripheral wall 21 that forms the medium-diameter hole 22c. Therefore, the convex portion 23 is aligned with the body portion 3 of the syringe 2 in the direction of the axis O, and the front end of the convex portion 23 (tip 20a of the loading tool 20) and the rear end of the convex portion 23 (stepped portion 22d). Thus, the annular wall 6 and the rear end portion 5 of the cylinder 2 are regulated to prevent the syringe 2 from moving in the axis O direction so that the syringe 2 does not move in the axis O direction with respect to the loading tool 20.

In addition, of the peripheral wall 21 that forms the loading port A ₄ , the portion corresponding to the body 3 of the syringe 2 (body side peripheral wall) 21 a has a C-shaped cross section as shown by the AA end face. None, the gap between them is narrower than the outer diameter of the body 3. Thereby, the trunk | drum 3 of the syringe 2 is hooked and each latched by the said surrounding wall 21a by being pushed in into the clearance gap formed between the trunk | drum side surrounding walls 21a. For this reason, it is possible to fit the convex portion 23 through the loading port A _{4 by} a simple operation of pushing the syringe 2 into the loading port A ₄ . In particular, in this embodiment, a locking projection 21p is provided on the inner peripheral surface of the peripheral side of the peripheral wall 21a. Reference numeral 24 denotes a finger hook provided on the peripheral wall 21.

Reference numeral 30 in FIG. 3 is a plunger accommodated in the loading tool 20. The plunger 30 is accommodated in the through hole 22 through the opening A ₅ formed at the rear end 20 b of the loading tool 20. As shown in FIG. 5 (a), the plunger 30 constitutes a shaft having a cross-sectional shape made up of four thin plate-like members 31, and a pressure receiving portion 32 that is pressed by a user with a finger is provided at the rear end. It has been.

Further, the plunger 30 has a tip 33 which projects from the loading port A _4. The distal end portion 33 is provided with a concave portion 34 for accommodating the rear end portion 13 of the piston member 10 and a concave narrow portion 35 for accommodating the guide portion 12 of the piston member 10 and hooking the rear end portion 13. Thereby, when the cartridge 1 is loaded through the loading port A ₄ , the piston member 10 can be advanced and retracted by the plunger 30 by the rear end portion 13 of the piston member 10 being hooked and locked to the tip portion 33 of the plunger 30. it can. In addition, according to this invention, the narrow part 35 can employ | adopt the structure similar to the trunk | drum side surrounding wall 21a of the loading tool 20. FIG.

  Further, the plunger 30 is provided with a front-end-side projection 36 and a rear-end-side projection 37 at intervals in the direction of the axis O on two plate-like members 31 facing each other across the axis O. Yes. The front end side protruding portion 36 is configured as an elastic piece that expands toward the rear end. Further, the rear end side protruding portion 37 is configured as a step formed on the plate-like member 31.

3 and 5, reference numeral 40 denotes a synthetic resin sleeve member in which a through hole A ₆ is formed. The inner diameter of the sleeve member 40 has a shape that rotatably holds a cross-shaped shaft composed of four plate-shaped members 31, and the distal end 40 a of the sleeve member 40 is slidably retained by contact with the distal end side projection 36. In addition to being held, the rear end 40 b is slidably held by contact with the rear end side projection 37. As a result, as shown in FIG. 3, the sleeve member 40 can rotate between the front-end-side protrusion 36 and the rear-end-side protrusion 37 that are provided on the outer peripheral surface of the plunger 30 with an interval in the direction of the axis O. Retained.

  Further, the outer diameter of the sleeve member 40 has a shape that can be accommodated in the passage (large diameter hole) 22b of the loading device 20, and two first protrusions are provided on the outer peripheral surface at positions facing each other with the axis O therebetween. A portion 41 is formed. The first projecting portion 41 is also configured as an elastic piece that expands toward the rear end in the same manner as the front end projecting portion 36, and fits into the slit hole 25 formed in the loading tool 20 from the inside. Thereby, the sleeve member 40 can be advanced and retracted along the slit hole 25 in the passage 22b, and both side end surfaces 25e function as a stopper together with the first protrusions 41.

  In addition, four vertical ribs 42 are formed on the outer peripheral surface of the sleeve member 40 at intervals from the protrusion 41 in the direction of the axis O. The vertical ribs 42 are formed with an interval around the axis O. As shown in FIG. 6A, each of the vertical ribs 42 is joined from the inside to the groove portion 26 formed in the loading tool 20. Thereby, the sleeve member 40 can be advanced and retracted along the groove 26 in the passage 22b.

  Further, as shown in FIGS. 5 (c) and 7 (b), four key grooves 43 are formed on the inner peripheral surface of the sleeve member 40 so that the rear end side projections 37 provided on the plunger 30 are joined. ing. The key grooves 43 are formed at intervals around the axis O so as to correspond to the vertical ribs 42. Each of the key grooves 43 extends along the axis O. As a result, the plunger 30 is rotated clockwise or counterclockwise around the axis O with respect to the sleeve member 40, so that the rear end side protrusion 37 becomes the key groove 43 as shown in FIG. , It can be pushed into the sleeve member 40 along the key groove 43, and its end side edge 37e contacts the end surface (butting surface) 43e of the key groove 43, so that the end surface of the key groove 43 It functions as a stopper together with 43e.

  Reference numeral 50 denotes an elastic member that is interposed between the loading tool 20 and the sleeve member 40 and can be deformed and restored. The elastic member 50 gives a restoring force to the pushing of the sleeve member 40. Thereby, when the plunger 30 is pushed against the loading device 20 against the elastic force of the elastic member 50, the plunger 30 can automatically return to the initial position by the restoring force of the elastic member 50. Examples of the elastic member 50 include a coil spring. However, according to the present invention, the elastic member 50 is not limited to this.

  Next, the operation of the cartridge type syringe according to this embodiment will be described.

  In this embodiment, the user attaches the needle 16 to the cartridge 1 as shown in FIG. 2 by screwing the needle part 15 after removing the overcap C from the filled cartridge 1 shown in FIG. To do.

Next, as shown in FIG. 6, the cartridge 1 with a needle is stored in the loading device 20 through the loading port A ₄ . Syringe 2 is that its body portion 3 is pushed into mutual peripheral wall 21a which forms a loading port A _4, locked caught on each said peripheral wall 21a. Thus, the needle equipped cartridge 1, without separately providing a loading port A ₄ closing member, it can be attached to the operating device (loader 20).

At the same time, the piston member 10 is integrated with the plunger 30 by the rear end portion 13 of the piston member 10 being hooked and locked to the tip portion 33 of the plunger 30 exposed through the loading port A ₄ . As a result, the piston member 10 can be advanced and retracted by the plunger 30 with a simple operation of loading the cartridge 1 into the operating instrument I. In addition, the cartridge 1 raises the catch with respect to the trunk | drum 3 by providing the latching protrusion 21p in the edge side inner peripheral surface of the trunk | drum side surrounding wall 21a.

  Next, when the content liquid is aspirated from the outside, for example, the content liquid filled in the ampule is aspirated, the following operation is performed.

  First, in the state shown in FIG. 6A, the user confirms that the rear end projection 37 does not coincide with the key groove 43 as shown in FIG. Is pushed against the urging force of the elastic member 50 as shown in FIG. Next, in this state, if the needle 16 is inserted into an ampoule or the like filled with the content liquid to release the pushing of the plunger 30, the piston member 10 and the plunger 30 together with the plunger 30 due to the restoring force of the elastic member 50 are shown in FIG. It automatically returns to the initial position shown in a). At this time, since a negative pressure is generated in the filling space R, the content liquid can be automatically sucked into the filling space R by this negative pressure.

  In the actual injection stage, the pushing amount of the plunger 30 can be adjusted without being affected by the urging force of the elastic member 50 by performing the following preliminary operation. In this case, when the user rotates the plunger 30 clockwise or counterclockwise around the axis O, as shown in FIG. 8B, the user aligns the rear end protrusion 37 with the key groove 43. As shown in FIG. 8A, the user can separately push only the plunger 30 along the key groove 43 without depending on the urging force of the elastic member 50. For this reason, the user can appropriately pour out a desired amount of content liquid by adjusting the pushing amount of the plunger 30 regardless of the urging force of the elastic member 50. Moreover, since the urging force of the elastic member 50 does not act, even if the pouring operation is stopped halfway, the remaining portion can be poured out again.

  After use, only the cartridge 1 can be removed from the operating instrument I by grasping the cylindrical body portion 7 of the syringe 2 and pulling the cartridge 1 with the used needle outward. Thereby, the operating instrument I which removed the cartridge 1 can inject | pour content liquid repeatedly using the cartridge 1 with a new needle.

  Furthermore, the needle part 15 can be removed from the cartridge 1 by turning around the axis O with respect to the cartridge 1 and loosening the screw. Thereby, the needle part 15 and the cartridge 1 can be separated and discarded. When the cartridge 1 is discarded, an overcap C is attached as shown in FIG. Thereby, the cartridge 1 can be discarded safely and hygienically. Further, the needle part 15 can be disposed of safely and hygienically by attaching an overcap to the needle holder 17 as in the conventional case.

The operating instrument I is simply inserted into the plunger 30 through the through-hole A _{6 of the} sleeve member 40 and then the plunger 30 having the sleeve member 40 is inserted from the opening A ₅ of the rear end 20 b of the loading tool 20. Easy to assemble with simple work.

  In particular, in this embodiment, since the distal end side protruding portion 36 is an elastic piece with respect to the plunger 30, the distal end side protruding portion 36 is elastically deformed when the plunger 30 is inserted into the sleeve member 40, and the plunger 30 Since it is caught by the upper end 40a of the sleeve member 40 without obstructing the pushing, the sleeve member 40 can be retained and retained together with the rear end side projection 37. For this reason, the assembly work of the plunger 30 and the sleeve member 40 can be easily performed.

  Further, since the first protrusion 41 is also an elastic piece with respect to the sleeve member 40, the first protrusion 41 is elastically deformed when the sleeve member 40 is inserted into the loading device 20, and the sleeve member 40 The sleeve member 40 can be prevented from coming off because it is caught on the end face 25e of the slit hole 25 without obstructing the pushing. For this reason, the assembly | attachment operation | work with the loading tool 20 and the plunger 30 provided with the sleeve member 40 can also be performed easily.

  As described above, in this embodiment, the piston member 10 can be advanced and retracted by the plunger 30 by fitting the rear end portion 13 of the piston member 10 to the distal end portion 33 of the plunger 30. For this reason, the content liquid can be sucked from the outside by a simple operation of fitting the rear end portion 13 of the piston member 10 to the front end portion 33 of the plunger 30.

  Further, since the plunger 30 is held by the elastic member 50 with respect to the loading device 20 via the sleeve member 40, the plunger 30 is automatically returned to the initial position only by releasing the finger after pushing the plunger 30. Return. For this reason, the content liquid from the outside can be automatically sucked by a simple operation of simply releasing the finger after pushing the plunger 30.

  In addition, in this embodiment, if the plunger 30 is rotated clockwise or counterclockwise around the axis O so that the rear end-side protrusion 37 coincides with the key groove 43, the key is not used regardless of the elastic member 40. Only the plunger 30 can be separately pushed along the groove 43 to the key groove end surface 43e. For this reason, the user can appropriately pour out a desired amount of content liquid by adjusting the pushing amount of the plunger 30 regardless of the urging force of the elastic member 50.

  Therefore, according to this embodiment, it is possible to provide a novel cartridge-type syringe that allows the content liquid to be easily aspirated from the outside while allowing the content liquid to be filled and exchanged, and to easily adjust the amount of the liquid dispensed. be able to.

  Incidentally, in the first embodiment described above, the cartridge 1 with the needle 16 is connected to the plunger 30 and then the content liquid is sucked. However, according to the present invention, the plunger 30 is moved simultaneously with the content liquid suction operation. The piston member 10 can be connected.

  9 to 12 show a second embodiment of the present invention. In the present embodiment, the same parts as those in the first embodiment have the same reference numerals, and the description thereof is omitted.

  In the cartridge 1 according to the present embodiment, as shown in FIG. 9, the rear end portion 13 of the piston member 10 is configured as a plurality of elastic tongue pieces 13a that can be deformed and restored. Each of the elastic tongue pieces 13a has an outward claw portion 13b and is disposed so as to surround the axis O.

  Next, the connection between the cartridge 1 and the plunger 30 and the suction of the content liquid in the cartridge type syringe according to this embodiment will be described. Since other operations are the same as those in the first embodiment, description thereof is omitted.

In the present embodiment, as in the first embodiment, first, as shown in FIG. 9, the needle part 15 is attached to the cartridge 1 and then loaded into the operating instrument I through the opening A _{4 as} shown in FIG.

  Next, when the plunger 30 is pushed toward the front end side against the urging force of the elastic member 50, the rear end portion 10 b of the piston member 10 comes into contact with the front end portion 33 of the plunger 30. At this time, since the elastic tongue 13a having the outward claw portion 13b is deformed, when the claw portion 13b reaches the concave portion 34 through the narrow portion 35, it is restored in the concave portion 34, thereby The rear end portion 13 of the member 10 is caught by the front end portion 33 of the plunger 30 and locked. Accordingly, the rear end portion 10b of the piston member 10 is integrally connected to the front end portion 33 of the plunger 30 as shown in FIG.

  Therefore, if the needle 16 is inserted into an ampoule or the like filled with the content liquid in the state shown in FIG. 11 to release the plunger 30, the restoring force of the elastic member 50 causes the same as in the first embodiment. The content liquid can be automatically sucked into the filling space R. Thereby, the connection of the cartridge 1 and the plunger 30 and the suction of the content liquid can be easily performed.

  In this embodiment, since the rear end portion 10b of the piston member 10 is substantially the same as the press-fitting fit to the distal end portion 33 of the plunger 30, the narrow portion 35 formed in the distal end portion 33 of the plunger 30 is penetrated. It can also be configured as a hole. The operation at the stage of actual injection is the same as in the first embodiment.

The above description only shows one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the loading port A ₄ has a shape that is cut out along the axis O from the tip 20 a of the loading tool 20, so that the tip 20 a of the loading tool 20 is used for catching with the body 3. It is not limited to. For example, if the annular projection 23 is separately provided on the inner peripheral surface of the peripheral wall 3 and the loading port A ₄ is formed at a position corresponding to (opposed to) that portion, the tip 20 a of the loading tool 20 is connected to the trunk 3. There is no need to use it. In this case, when the cylindrical body portion 7 is housed in the loading tool 20, the outer diameter of the tip portion 4 surrounded by the cylindrical body portion 7 is further reduced, so that a smaller amount can be dispensed. It becomes. In addition, the needle part 15 may employ a pipe or a nozzle instead of the needle 16. Furthermore, according to this invention, the component of each form can be diverted between each form.

  The present invention includes a syringe and a cartridge that includes a piston member that is slidably held in a through-hole of the syringe, a loading tool that has a space for loading the cartridge and that has a passage that leads to the space, A cartridge type syringe provided with a plunger capable of pushing the piston member through the passage of the loading device can be applied to various types. Also, the type of contents is not limited.

DESCRIPTION OF SYMBOLS 1 Cartridge 2 Syringe 3 Syringe trunk | drum 4 Syringe front-end | tip part 5 Syringe rear end part 6 Annular wall 7 Cylindrical body part 7s Screw part 8 Through-hole 8a Small diameter hole 8b Large diameter hole 8c Large diameter hole 8f Slope 10 Piston member 10a Piston front end 10b Piston rear end 11 Piston body 12 Guide portion 12f Oblique side 13 Piston rear end portion 15 Needle parts 16 Needle 17 Needle holder 17s Flange portion (thread portion)
20 loading tool 20a loading tool front end 20b loading tool rear end 21 loading tool peripheral wall 21a trunk side peripheral wall 21e peripheral wall edge 21p locking projection 22 through hole 22a small diameter hole 22b large diameter hole (passage)
22c Medium diameter hole 22d Step part 23 Protrusion part 25 Slit hole 25e Slit hole end surface 30 Plunger 30a Plunger front end 30b Plunger rear end 31 Plate member 32 Pressure receiving part 33 Plunger front end part 34 Narrow part 35 Recessed part 36 Front side protrusion part 37 Rear end Side projection 40 Sleeve member 41 First projection 42 Vertical rib 43 Key groove 43e Key groove end surface 50 Elastic member

Claims (6)

A cartridge including a syringe and a piston member that is slidably held in the through-hole of the syringe, a loading tool having a space for loading the cartridge, and a passage communicating with the space, and a passage for the loading tool A cartridge-type syringe comprising a plunger through which a piston member can be pushed,
Provided is a sleeve member that is rotatably held between the front end side protrusion and the rear end side protrusion provided on the outer peripheral surface of the plunger at an interval in the axial direction and that can be accommodated in the passage of the loading device,
On the outer peripheral surface of the sleeve member, a projection is formed to fit the slit hole formed in the loading tool from the inside, and the sleeve member is advanced and retracted along the slit hole, and on the inner peripheral surface of the sleeve member, When the rear end protrusion provided on the plunger is joined, a key groove is formed that allows only the plunger to be pushed in . When the rear end protrusion provided on the plunger does not fit the key groove, the plunger The sleeve member is pushed onto the plunger by pushing in, and the sleeve member is pushed in,
An elastic member is provided between the sleeve member and the loading tool to give a restoring force against the pushing of the sleeve member,
A cartridge-type injector characterized in that a rear end portion of a piston member protruded from a rear end of a syringe and a front end portion of a plunger are formed into fitting shapes that can be attached to and detached from each other.   2. The cartridge according to claim 1, wherein a loading port of the cartridge formed in the loading tool is formed by an opening cut out from a front end to a rear end of the loading tool, and a rear end portion of the piston member is configured as a flange portion. On the other hand, a cartridge type syringe provided with a narrow portion for hooking the flange portion at the distal end portion of the plunger.   2. The cartridge type syringe according to claim 1, wherein the rear end portion of the piston member is configured as an elastic tongue piece having a claw portion, and a narrow portion for hooking the claw portion is provided at a tip portion of the plunger.   4. The vertical rib for forming the sleeve member together with the plunger along the groove portion is formed on the outer peripheral surface of the sleeve member from the inside along the groove portion formed on the loading device. A cartridge type syringe characterized by that.   The cartridge type syringe according to any one of claims 1 to 4, wherein the tip side protrusion provided on the plunger is configured as an elastic piece.   The cartridge type syringe according to any one of claims 1 to 4, wherein the protrusion provided on the sleeve member is configured as an elastic piece.

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