JP2022168261A - Medical solution injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical solution injector which has a novel structure and can achieve at least one of the followings (a) to (c) where (a) a filter can be easily arranged, and the remaining of air in a medical solution is easily prevented, (b) the injector is excellent in portability, and (c) the medical solution is easily filled in a medical solution reservoir.

SOLUTION: A medical solution injector 10 includes at least one of the followings (A) to (C). (A) A holding means 77 for holding a medical solution reservoir 14 in a posture where a medical solution outflow port 72 to which a filter 68 is fixed is located on an upper side of the medical solution reservoir 14 is provided. (B) Cross sections of the medical solution reservoir 14 and a housing 12 have corresponding flat shapes. (C) A plunger 106 which presses a bottom part 94 for contracting the medical solution reservoir 14 is provided to be separated from the bottom part 94.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a drug injection device for continuously injecting drug solutions such as anesthetics, analgesics, anticancer drugs, and antibiotics into the body.

When administering drug solutions such as anesthetics, analgesics, anticancer drugs, and antibiotics to patients, where it is required to continuously administer small amounts of drug solutions over a long period of time, from several hours to several days. There is also In such a case, a portable liquid medicine injection device has been conventionally used for continuously discharging the liquid medicine stored in the liquid medicine reservoir and injecting the liquid medicine into the patient's body. For example, a fluid ejection device described in Japanese Patent Laying-Open No. 8-68383 (Patent Document 1) is an example of the above-described chemical injection device, and as disclosed in FIG. It has a structure in which a tank member (medicine reservoir) to store is pressed by a spring member. It is designed to be injected into the body of

However, the fluid ejection device described in Patent Document 1 has the following points to be improved.

The first point to be improved in the fluid ejection device disclosed in Patent Document 1 is that air tends to remain in the chemical liquid stored in the tank member. That is, as shown in FIG. 1 of Patent Document 1, if the fluid ejection device is used in such a direction that the outflow port of the chemical solution opens to the side of the tank member, air mixed in the chemical solution stored in the tank member will be discharged. However, it is difficult to discharge to the outside even by priming, and there is a risk that the remaining air will flow out of the tank member together with the chemical solution. Furthermore, when the liquid medicine is administered by the fluid ejection device, the liquid medicine is passed through a filter for removing foreign matter. There is also the problem that the work of setting the correct orientation and position is complicated.

The second point to be improved in Patent Document 1 is that the outer shape of the tank member is circular. Second, the tank member is bulky. As a result, there is a problem that the tank member is pressed against the patient, causing a sense of discomfort, and the clothes are distorted and swelled, which makes it difficult to carry.

The third point to be improved in Patent Document 1 is the difficulty of injecting the chemical liquid into the tank member. That is, since the tank member is always pressurized by the spring member, when injecting the chemical liquid into the tank member, it is necessary to inject the chemical liquid into the tank member against the biasing force of the spring member and store it. be. As a result, it is difficult for the chemical solution to enter the tank member, and if the chemical solution is injected too vigorously at a high flow rate, air tends to be mixed with the chemical solution in the tank member.

JP-A-8-68383

The present invention was made against the background of the above circumstances, and the first invention was made in view of the first point to be improved, and the first invention is the problem to be solved. The object of the present invention is to provide a liquid medicine injector having a novel structure in which a filter is appropriately arranged and air is easily prevented from remaining in the liquid medicine reservoir by priming.

The second invention has been made in view of the above-mentioned second point to be improved. To provide a liquid medicine injection device with a novel structure which is also excellent.

The third invention has been made in view of the third point to be improved, and the problem to be solved by the third invention is that the operation of filling the chemical solution reservoir with the chemical solution can be easily performed. To provide a liquid medicine injector with a new structure capable of

Hereinafter, aspects of the present invention that have been made to solve such problems will be described. It should be noted that the constituent elements employed in each aspect described below can be employed in any possible combination.

A first aspect of the first invention is provided with a chemical reservoir having a chemical reservoir area and a chemical outlet communicating with the chemical reservoir area, wherein the chemical liquid stored in the chemical reservoir is discharged to the In the chemical injection device that continuously flows out from the chemical liquid outlet, the chemical liquid outlet is provided with a filter for removing foreign substances in the chemical liquid stored in the chemical liquid storage area, and the chemical liquid outlet is connected to the chemical liquid reservoir. is provided with holding means for holding the liquid medicine reservoir in an orientation positioned above the liquid medicine reservoir.

According to the drug solution injector constructed according to this aspect, since the filter is provided in advance at the drug solution outlet, even if the filter has directionality, injection connected to the drug solution outlet Regardless of the direction of the flow path, the fluid flowing out of the chemical reservoir can be reliably passed through a correctly set filter.

Furthermore, the holding means holds the chemical reservoir in such a direction that the chemical outlet is positioned above the chemical reservoir, and air in the chemical reservoir gathers at the chemical outlet due to buoyancy. Air can be efficiently discharged to the outside from the chemical solution outlet.

A second aspect of the first invention is the chemical injector according to the first aspect of the first invention, wherein the upper wall surface of the chemical reservoir region in the chemical reservoir faces the chemical outlet. It is configured including an upwardly inclined tapered surface.

According to the chemical injection device constructed according to this aspect, during priming, the air (bubbles) floating in the chemical reservoir is guided to the chemical outlet by the tapered surface. it gets harder.

A third aspect of the first invention is the drug solution injector according to the first or second aspect of the first invention, wherein the drug solution outlet is expanded in diameter at a communication port to the drug solution reservoir area. The filter is disposed in the communication port, and at least one of the upper portion and the lower portion of the communication port than the filter has a tapered shape with a smaller diameter in the upward direction. is.

According to the chemical injection device constructed according to this aspect, the communication port of the chemical solution outlet is tapered at least one of the upper side and the lower side than the filter, so that the air can flow into the vicinity of the filter and the chemical solution outlet. hard to stay.

In particular, if the upper portion of the filter is tapered, the diameter of the communication port of the chemical outflow port is enlarged, and a large space for arranging the filter can be obtained. At the same time, it is possible to secure a large effective area of the filter while reducing the diameter of the chemical outlet.

A fourth aspect of the first invention is the drug solution injector according to any one of the first to third aspects of the first invention, further comprising a hard housing for accommodating the drug solution reservoir. The liquid medicine outflow port is provided through the upper wall portion of the housing, and the holding means is constituted by the lower surface of the housing which can be placed on a flat support surface.

According to the chemical injection device constructed according to this aspect, by placing the hard housing on a flat support surface, the chemical outlet provided in the upper wall of the housing is positioned above the chemical reservoir accommodated in the housing. By priming with the housing resting on the support surface, air in the chemical reservoir can be efficiently expelled.

A first aspect of the second invention is provided with a chemical reservoir having a chemical reservoir area, a chemical outlet communicating with the chemical reservoir area, and a chemical liquid stored in the chemical reservoir. In the chemical injection device that continuously flows out from the chemical outlet, the chemical reservoir has a bellows structure, and the chemical stored in the chemical reservoir area of the chemical reservoir is caused to flow by contraction of the chemical reservoir. While it is possible to continuously flow out from the outlet, the cross section of the liquid medicine reservoir is flat and the cross section of the hard housing that accommodates the liquid medicine reservoir corresponds to the liquid medicine reservoir. It is characterized in that it has a flat shape in the direction of

According to the drug solution injection device constructed according to this mode, the housing has a flat shape in cross section, so that the housing does not press the patient when the patient carries it in a pocket of clothes, for example. It is difficult to give a sense of incongruity when it is pushed open, and it is difficult to cause a bulge when a pocket or the like is pushed open, and it is excellent in portability.

In addition, since the liquid medicine reservoir housed in the housing also has a flat shape in cross section, the volume of the liquid medicine reservoir can be secured even if the housing is made thin in order to improve the portability of the liquid medicine injection device. can be done.

A second aspect of the second invention is the drug solution injector according to the first aspect of the second invention, wherein a spring member is provided to exert a force in a contraction direction on the drug solution reservoir, and a plurality of The spring members are arranged in parallel in the longitudinal direction of the cross section of the liquid medicine reservoir.

According to the drug solution injector constructed according to this aspect, the drug solution reservoir having a flat cross-sectional shape can be stably contracted by the plurality of spring members without being tilted in the longitudinal direction.

A third aspect of the second invention is the drug solution injector according to the first or second aspect of the second invention, wherein both the cross section of the drug solution reservoir and the cross section of the housing are oval. It is assumed to be a shape.

According to the chemical injection device constructed according to this aspect, it is possible to prevent the corners of the housing from being pressed against the user or clothes, thereby further improving the portability.

A first aspect of the third invention is provided with a chemical reservoir having a chemical reservoir area and a chemical outlet communicating with the chemical reservoir area, and the chemical liquid stored in the chemical reservoir is discharged to the A chemical injection device for continuously discharging a chemical from a chemical outlet is provided with a plunger that presses the bottom of the chemical reservoir to contract the chemical reservoir, and the bottom of the chemical reservoir and the plunger are separable. It is characterized by

According to the chemical injection device constructed according to this aspect, for example, by filling the chemical solution into the chemical solution reservoir while the chemical solution reservoir is held in a contracted state away from the plunger, the chemical solution reservoir is filled with the chemical solution. The extension is not restricted by the pressing force from the plunger, and the inflow of the drug solution into the drug solution reservoir is less likely to be blocked by the plunger. Therefore, the chemical liquid can be smoothly filled into the chemical liquid reservoir, and air remaining in the chemical liquid reservoir can be reduced.

A second aspect of the third aspect of the invention is the chemical injection device according to the first aspect of the third aspect of the invention, further comprising reservoir contraction holding means for holding the chemical solution reservoir in a contracted state, A pressure releasing means is provided for releasing the pressure applied from the plunger to the liquid medicine reservoir.

According to the chemical injection device constructed according to this aspect, the chemical reservoir is filled with the chemical fluid while the chemical fluid reservoir is held in the contracted state by the reservoir contraction holding means, whereby the extension of the chemical fluid reservoir is applied by the pressing force from the plunger. is allowed without being restricted by the liquid medicine, so that the liquid medicine is smoothly filled into the liquid medicine reservoir. Moreover, there is no need to fill the chemical solution under a large pressure into the chemical solution reservoir, and the amount of air remaining in the chemical solution reservoir can be reduced.

Furthermore, if the plunger is released from the pressure releasing means after the chemical liquid is completely filled into the chemical liquid reservoir, the bottom portion of the chemical liquid reservoir is pushed by the plunger to contract the liquid chemical reservoir, thereby causing the liquid chemical to flow out from the chemical liquid outlet port. can be made

A third aspect of the third aspect of the present invention is the chemical injection device according to the second aspect of the third aspect of the present invention, wherein a hard housing for accommodating the chemical reservoir is provided with a small projection protruding inward. The reservoir contraction holding means is constituted by locking the liquid medicine reservoir against the small projection.

According to the chemical injection device constructed according to this mode, the chemical reservoir is housed in the housing in a contracted state, so that the chemical reservoir is engaged with the small protrusion protruding inside the housing, and the chemical reservoir is contracted. , the reservoir contraction holding means can be realized with a simple structure.

A fourth aspect of the third invention is the chemical injector according to the third aspect of the third invention, wherein the chemical reservoir is applied to the small projection with a force that can be released by the inflow pressure of the chemical. By being engaged, the reservoir contraction holding means is constituted.

According to the drug injection device constructed according to this aspect, when the drug solution flows into the drug solution reservoir, the engagement between the drug solution reservoir and the small protrusion is automatically released. smoothly realized.

A fifth aspect of the third invention is the drug solution injector according to any one of the second to fourth aspects of the third invention, further comprising a hard housing that accommodates the plunger. A spring member is provided between the plunger and the bottom of the housing for urging the plunger toward the bottom of the chemical reservoir. The pressing releasing means is provided so that the holding means can be held at a position away from the reservoir.

According to the liquid injector constructed according to this aspect, the force exerted by the plunger on the bottom of the liquid reservoir can be obtained with a simple structure by the elasticity of the spring member arranged between the plunger and the bottom of the housing. can. In addition, when the plunger is brought closer to the bottom of the housing against the elastic force of the spring member, the plunger can be separated from the liquid reservoir by locking the pressure releasing means provided on the housing to the plunger. can be held in place.

A sixth aspect of the third invention is the drug solution injector according to any one of the first to fifth aspects of the third invention, wherein the drug solution reservoir has a bellows structure. .

According to the drug solution injector constructed according to this mode, expansion and contraction of the drug solution reservoir can be largely allowed while suppressing changes in the outer peripheral shape.

A seventh aspect of the third invention is the drug solution injector according to any one of the first to sixth aspects of the third invention, wherein a buffer is provided between the bottom of the drug solution reservoir and the plunger. are distributed.

According to the chemical injection device constructed according to this aspect, when the plunger is released from the pressure releasing means and pressed against the bottom of the chemical reservoir, abnormal noise due to the collision between the plunger and the chemical reservoir is eliminated. , can be reduced by a buffer.

According to the drug solution injector constructed according to the first invention, the drug solution can stably flow out through the filter, and priming can be performed efficiently. According to the chemical injection device constructed according to the second aspect of the invention, the flat shape of the housing and the chemical reservoir makes it possible to achieve excellent portability while ensuring the volume of the chemical reservoir. According to the chemical injector constructed according to the third invention, by filling the contracted chemical reservoir with the chemical, it is possible to reduce the amount of air remaining in the chemical reservoir, and to reduce the amount of the chemical to the chemical reservoir. filling becomes easier.

1 is a perspective view showing a chemical injection device as one embodiment of the present invention; FIG. FIG. 2 is a perspective cross-sectional view of the drug solution injector shown in FIG. 1; FIG. 2 is a perspective cross-sectional view showing another cross section of the drug solution injector of FIG. 1 ; FIG. 2 is a perspective cross-sectional view showing another cross section of the drug solution injector of FIG. 1 ; FIG. 2 is a front view of the drug solution injector shown in FIG. 1; FIG. 2 is a plan view of the drug solution injector shown in FIG. 1; FIG. 2 is a bottom view of the drug solution injector shown in FIG. 1; VIII-VIII sectional view of FIG. IX-IX cross-sectional view of FIG. XX sectional view of FIG. FIG. 2 is a cross-sectional view showing the drug solution injector shown in FIG. 1 and showing a state before the drug solution is filled into the drug solution reservoir; FIG. 2 is a perspective cross-sectional view showing the drug solution injector shown in FIG. 1, showing a state after filling of the drug solution is completed and before injection of the drug solution into the patient is started; FIG. 2 is a cross-sectional view showing the drug solution injector shown in FIG. 1, showing a state in which the drug solution has been completely injected into the patient;

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

FIGS. 1-10 show a chemical injection device 10 as one embodiment of the present invention. This liquid medicine injection device 10 comprises a hollow housing 12 , and a liquid medicine reservoir 14 and an actuator 16 housed in the housing 12 . In the following description, the vertical direction means the vertical direction in FIG.

The housing 12 is made of a hard synthetic resin or the like, has a hollow structure with a housing space 18 therein, and has a flat, substantially oval cross section as shown in FIG. As shown in FIGS. 1 to 5 and FIGS. 8 and 9, the housing 12 of this embodiment includes a housing body 20 having a long cylindrical shape with a bottom, and a cover member 22 that closes the upper opening of the housing body 20 .

The inner peripheral shape of the housing body 20 is larger than the maximum outer peripheral shape of the peripheral wall portion 80 of the chemical reservoir 14, which will be described later, so that the chemical reservoir 14 can be arranged on the inner periphery. Furthermore, a plurality of small projections 23 are provided on the inside (inner peripheral surface) of the housing body 20, as shown in FIG. The small protrusion 23 has a tapered shape in which the vertical dimension becomes smaller toward the tip of the protrusion, so that the protrusions 102, 102, which will be described later, can easily get over. Furthermore, bottom mounting cylinder portions 26, 26 are integrally formed on the bottom portion 24 of the housing body 20 so as to protrude upward, and are fitted to lower end portions of coil springs 108, 108, which will be described later. The housing body 20 of the present embodiment is transparent or translucent, and as shown in FIGS. It is

Further, the bottom portion 24 of the housing body 20 is provided with a slide hook 30 as a pressure release means. As shown in FIGS. 2 to 4, the slide hook 30 integrally includes an operation portion 32 that is slidably operated on the lower surface of the housing body 20 and a hook portion 34 that protrudes upward from the operation portion 32 .

More specifically, the operating portion 32 has a substantially triangular plate shape, is arranged in a groove portion 36 that extends linearly in the minor axis direction on the lower surface of the housing body 20, and is movable in the groove portion 36 in the minor axis direction. It is

A hook insertion hole 38 penetrating vertically is formed in the groove portion 36 of the housing body 20 , and the hook portion 34 is inserted into the hook insertion hole 38 so that the hook portion 34 is inserted into the accommodation space 18 of the housing 12 . it is put in. The hook portion 34 extends upward from a portion of the operation portion 32 and has a distal end portion protruding in the short axis direction of the housing body 20 . As the operation portion 32 moves within the groove portion 36 , the hook portion 34 moves within the hook insertion hole 38 in the minor axis direction. The operating portion 32 is provided with engaging pieces 40, 40 that are slidably engaged with the opening edge portion of the hook insertion hole 38. 40 is in contact with the inner peripheral surface of the hook insertion hole 38 in the short axis direction (vertical direction in FIG. 7), so that the amount of sliding displacement of the slide hook 30 with respect to the housing body 20 is adjusted to both sides in the short axis direction. is limited by Further, in the present embodiment, the hook portion 34 having a structure capable of moving in the short axis direction of the housing body 20 is illustrated, but the hook portion 34 may have a structure capable of moving in the long axis direction of the housing body 20 .

On the other hand, the cover member 22 has a substantially elongated disk shape as a whole, and on the lower surface of the outer peripheral portion thereof, a fitting protrusion 42 to be fitted into the opening of the housing body 20 is continuously formed in the circumferential direction. is provided. Furthermore, the fitting protrusion 42 has a plurality of portions that protrude greatly in the circumferential direction, and has a locking protrusion 44 that protrudes outward from the lower end thereof.

In addition, downwardly protruding reservoir connecting pieces 46 , 46 are integrally formed on the inner peripheral portion of the cover member 22 . The reservoir connecting piece 46 has a curved plate shape that curves in the circumferential direction. An engaging pawl 48 is provided that protrudes inward in the axial direction. Slits 50 , 50 penetrating vertically through the cover member 22 are formed adjacent to the reservoir connecting pieces 46 , 46 on the inner peripheries of the reservoir connecting pieces 46 , 46 .

Further, a reservoir connecting portion 52 is integrally formed on the inner circumference of the cover member 22 with respect to the reservoir connecting pieces 46 , 46 . The reservoir connecting portion 52 has a cylindrical shape and is fitted with a cylindrical seal ring 54 made of silicone rubber or the like.

Furthermore, a syringe connection portion 56 and a tube connection portion 58 are provided on the inner circumference of the reservoir connection portion 52 in the cover member 22 . The syringe connection portion 56 has a bottomed tubular shape that protrudes vertically from the cover member 22 as a whole. , the inner cavity of the syringe connecting portion 56, and the inner peripheral region of the reservoir connecting portion 52 constitute a liquid medicine inlet 60 that passes through the cover member 22 and is connected to a liquid medicine reservoir area 78 of the liquid medicine reservoir 14, which will be described later. there is Further, a tubular elastic valve body 62 is fitted to the lower portion of the syringe connecting portion 56 , and the liquid medicine inlet 60 is closed by the valve body 62 . Furthermore, a flange-shaped lock portion 64 protruding outward is integrally formed at the upper end portion of the syringe connection portion 56, and a syringe 118, which will be described later, is held by a screw thread formed on the outer peripheral surface of the lock portion 64. It is connectable to the connecting portion 56 .

The tube connecting portion 58 has a substantially cylindrical shape, is provided in parallel with the syringe connecting portion 56 , and protrudes upward from the cover member 22 . Further, a filter accommodating portion 66 having a diameter larger than that of the tube connecting portion 58 is integrally formed on the lower side of the tube connecting portion 58, and a filter 68 is disposed on the inner circumference of the filter accommodating portion 66. there is

The filter 68 is formed of a porous material or the like, and filters the chemical liquid to trap foreign substances when the chemical liquid flows out through the chemical liquid outlet port 72 (described later). , and is bonded while being fitted in the filter housing portion 66 . In addition, a step is provided in the upper and lower intermediate portions of the filter housing portion 66, and the lower side of the step has a larger diameter than the upper side. It is arranged on the inner periphery of the filter accommodating portion 66 .

Further, a tapered surface 70 is formed above the step in the filter accommodating portion 66 . The tapered surface 70 has a shape that slopes upward toward the inner periphery and is provided above the filter 68 . Air bubbles that have passed through the filter 68 are You will be guided to

In addition, the lumen of the tube connecting portion 58 is connected to the inner peripheral region of the reservoir connecting portion 52 via the lumen of the filter housing portion 66, and the lumen of the tube connecting portion 58 and the filter housing portion 66 are connected to each other. and the inner peripheral region of the reservoir connecting portion 52 constitute the drug solution outlet 72 of the present embodiment. The drug solution outlet 72 is provided vertically through the cover member 22 , and the lower opening of the drug solution outlet 72 is formed by the inner cavity of the filter housing portion 66 and the inner peripheral region of the reservoir connection portion 52 . A communication port 74 is formed as a part.

The communication port 74 has a lower portion formed by the inner peripheral region of the reservoir connection portion 52 and has a larger diameter than an upper portion formed by the inner cavity of the filter housing portion 66 , and is positioned around the filter housing portion 66 . The upper bottom surface of the inner peripheral region of the reservoir connection portion 52 is formed as a tapered surface 75 that slopes upward toward the inner periphery. In short, in this embodiment, the communication port 74 of the chemical outlet 72 is provided with the tapered surface 70 above the filter 68 and the tapered surface 75 below the filter 68 .

The fitting protrusion 42 of the cover member 22 is fitted into the upper opening of the housing body 20 , and a plurality of locking protrusions 44 provided on the fitting protrusion 42 of the cover member 22 are engaged with the housing body 20 . The housing main body 20 and the cover member 22 are fixed to each other by being fitted into a plurality of engaging holes 76 formed through the upper portion and locked to the inner surfaces of the engaging holes 76 in the vertical direction. . Thus, the housing 12 is composed of the housing main body 20 and the cover member 22 , and an accommodation space 18 is formed inside the housing 12 between the housing main body 20 and the cover member 22 . The housing body 20 and the cover member 22 can also be fixed by welding. , and fixing by welding may be employed in combination.

The lower surface of the housing body 20 has a flat mounting surface 77 at the portion outside the groove 36, and the housing 12 has the mounting surface 77 superimposed on a horizontal surface 124 (described later) as a flat support surface. It is considered to be able to stand on its own. In the independent state of the housing 12, the cover member 22 constitutes the upper portion of the housing 12, and the liquid medicine outflow port 72 is positioned in the upper portion of the housing 12 and extends linearly in the vertical direction.

In addition, from the viewpoint of achieving both portability and securing the volume of the liquid medicine reservoir 14, the housing 12 has a ratio of the long axis to the short axis in the cross section (aspect ratio of the cross section) in the range of 6:4 to 8:2. It is desirable that the ratio is 7:3 in this embodiment. However, by adopting a housing 12 with a larger cross-sectional aspect ratio, portability can be improved, and by adopting a housing 12 with a smaller cross-sectional aspect ratio, the volume of the chemical reservoir 14 can be reduced. can also be obtained to a large extent.

A storage space 18 of the housing 12 accommodates a liquid medicine reservoir 14 . As shown in FIGS. 2 to 4 and 8 to 10, the liquid medicine reservoir 14 has a bag-like shape with a flat, substantially elliptical cross section, and has a liquid medicine reservoir area 78 in which the liquid medicine is stored. ing.

More specifically, the peripheral wall portion 80 of the liquid medicine reservoir 14 has a bellows structure, and the vertical expansion and contraction deformation is allowed by the bellows structure. It is said that it can be changed by deformation. The volume of the liquid medicine reservoir area 78 is not particularly limited, but in consideration of the portability of the liquid medicine injector 10, it is preferable that the plunger 106, which will be described later, is positioned at the lowest end. 50 to 150 ml when filled to the maximum. While the chemical reservoir 14 can be expanded and contracted by changing the angle of the pleats of the bellows structure in the peripheral wall portion 80, it is desirable that the peripheral wall portion 80 has little elasticity due to its material. Also, the method of manufacturing the chemical reservoir 14 is not particularly limited, but it can be manufactured, for example, by synthetic resin blow molding.

Further, the upper bottom portion 82 of the liquid medicine reservoir 14 is formed with a communicating hole 84 penetrating vertically, and a cylindrical engaging portion 86 projecting upward from the peripheral edge of the opening of the communicating hole 84 is integrally formed. . The cylindrical engaging portion 86 has a contact projection 88 projecting inwardly at its lower portion and an engaging projecting portion 90 projecting outwardly at its upper portion. , the chemical reservoir 14 is positioned vertically with respect to the housing 12 . In the present embodiment, the upper bottom wall surface of the liquid medicine reservoir area 78 in the liquid medicine reservoir 14 includes the inner peripheral surface of the contact protrusion 88, and the inner peripheral surface of the contact protrusion 88 is formed by the inner peripheral surface of the contact protrusion 88. It is a tapered surface 92 that slopes upward.

Furthermore, the bottom portion 94 of the liquid medicine reservoir 14 is thicker than the peripheral wall portion 80 and has a recess 96 that opens to the bottom surface. It's stuck. The sponge 98 is made of a porous foamed synthetic resin or the like with excellent cushioning properties, and is shaped like an oval disk. , and positioned below the bottom 94 of the chemical reservoir 14 . The peripheral wall of the recess 96 is located on the inner peripheral side of the peripheral wall portion 80 of the liquid medicine reservoir 14, and the peripheral wall of the recess 96 in the contracted state of the liquid medicine reservoir 14 is the peripheral wall portion of the folded liquid medicine reservoir 14. 80 to be inserted into the inner circumference.

Furthermore, the bottom wall portion of the recess 96 is provided with an extrusion protrusion 100 that protrudes upward. The push-out protrusion 100 is provided at a position vertically corresponding to a communication hole 84 provided in the upper bottom portion 82 of the chemical reservoir 14, and when the chemical reservoir 14 is contracted, the protrusion 100 extends from the communication hole 84 to the cylindrical engaging portion 86. It is designed to be inserted into the inner circumference of the

Furthermore, the bottom portion 94 of the chemical reservoir 14 is provided with protruding portions 102, 102 protruding to the outer periphery. The protruding portions 102 protrude on both sides of the liquid medicine reservoir 14 in the short axis direction (left and right direction in FIG. 8), and protrude to the outer periphery from the outermost peripheral edge of the peripheral wall portion 80 in the contracted state.

The chemical reservoir 14 is inserted into the inner circumference of the housing body 20, and the engaging protrusions 90 of the chemical reservoir 14 are engaged with the engaging claws 48 of the reservoir connecting pieces 46 of the cover member 22 in the vertical direction. As a result, it is arranged in the accommodation space 18 of the housing 12 while being suspended from the cover member 22 . As shown in FIG. 10, the housing 12 is flattened in the direction corresponding to the liquid medicine reservoir 14 arranged in the housing space 18, and the long axis directions of the housing 12 and the liquid medicine reservoir 14 are in the same direction (see FIG. 10). left-right direction in 10). Furthermore, in this embodiment, the gap between the inner peripheral surface of the housing body 20 and the peripheral wall portion 80 of the chemical reservoir 14 is substantially constant over the entire circumference.

In addition, the upward displacement of the chemical reservoir 14 with respect to the cover member 22 is restricted by the contact protrusion 88 of the chemical reservoir 14 being in contact with the reservoir connecting portion 52 of the cover member 22 in the vertical direction. It is difficult to release the lock between the mating protrusion 90 and the engaging claw 48 .

Furthermore, since the seal ring 54 is radially compressed between the tubular engaging portion 86 of the liquid medicine reservoir 14 and the reservoir connecting portion 52 of the cover member 22 , the tubular engaging portion 86 and the reservoir connecting portion 52 are separated from each other. are liquid-tightly sealed. As a result, the liquid medicine storage area 78 of the liquid medicine reservoir 14 and the inner peripheral area of the reservoir connecting part 52 are connected in a fluid-tight manner from the outside, and the inner peripheral area of the reservoir connecting part 52 is included. The chemical inlet 60 and the chemical outlet 72 communicate with the chemical reservoir area 78 .

In the state where the chemical reservoir 14 is attached to the cover member 22, the inner peripheral edge of the tapered surface 92 provided on the chemical reservoir 14 is less than the inner peripheral surface of the reservoir connecting portion 52 provided on the cover member 22. They are positioned substantially at the same position in the radial direction, so that bubbles in contact with the tapered surface 92 are easily guided to the chemical outlet 72 .

On the other hand, an actuator 16 is arranged below the liquid medicine reservoir 14 in the housing space 18 of the housing 12 . The actuator 16 includes a plunger 106 superimposed on the bottom portion 94 of the chemical reservoir 14 and a coil spring 108 as a spring member that urges the plunger 106 upward.

The plunger 106 is directly overlaid on the bottom portion 94 of the chemical reservoir 14 at its outer peripheral portion and indirectly overlaid with a sponge 98 interposed therebetween at its inner peripheral portion. As the plunger 106 is vertically displaced, the position of the bottom portion 94 of the chemical reservoir 14 is changed along with the deformation of the peripheral wall portion 80 . Indicating lines 110 extending in the circumferential direction are formed on the outer peripheral surface of the plunger 106 by printing, adhesive tape, or the like.

Further, the plunger 106 has an upside-down bottomed cylindrical shape as a whole, and has a structure in which an elongated cylindrical guide cylinder portion 112 extends downward from the outer peripheral edge of the upper bottom portion. Furthermore, on the upper bottom portion of the plunger 106, two upper mounting cylinder portions 114 to be fitted into the upper end portions of the coil springs 108 are provided side by side in the longitudinal direction (major axis direction) of the cross section of the plunger 106. .

The upper mounting cylinder portion 114 is arranged at a position corresponding to the lower mounting cylinder portion 26 provided on the bottom portion 24 of the housing body 20 in the vertical direction and separated vertically. Further, the guide tube portion 112 is provided at a position away from the upper attachment tube portion 114 toward the outer circumference, and has a vertical dimension larger than that of the upper attachment tube portion 114 .

In addition, as shown in FIGS. 3 and 4, the plunger 106 is provided with a hook engagement portion 116 that constitutes pressure release means at the central portion in the longitudinal direction. The hook locking portion 116 can be vertically locked to the hook portion 34 of the slide hook 30 attached to the housing body 20 when the plunger 106 is positioned at the lowest position. The engagement between the hook engagement portion 116 and the hook portion 34 prevents the plunger 106 from being displaced upward, and the plunger 106 is held at the lower end position.

A coil spring 108 is arranged between the plunger 106 and the bottom portion 24 of the housing body 20, as shown in FIGS. The upper mounting cylinder portion 114 of the plunger 106 is fitted into the upper end portion of the coil spring 108, and the lower mounting cylinder portion 26 of the housing body 20 is fitted into the lower end portion of the coil spring 108. 106 and one of housing body 20 . In this embodiment, two coil springs 108 are arranged in parallel in the longitudinal direction (major axis direction) of the cross section of the liquid medicine reservoir 14, that is, in the longitudinal direction of the plunger 106 in the cross section.

Furthermore, the upper portion of the coil spring 108 is inserted into the inner periphery of the guide tube portion 112 , and the guide tube portion 112 is interposed between the coil spring 108 and the peripheral wall portion 80 of the housing body 20 .

2 to 4, 8 and 9 show a state in which the coil spring 108 is contracted and the hook portion 34 and the hook engaging portion 116 are released from engagement. In this state, the plunger 106 is urged upward toward the bottom portion 94 of the chemical reservoir 14 by the elasticity of the coil spring 108, and the plunger 106 is pressed against the bottom portion 94 of the chemical reservoir 14 from below. Coil spring 108 exerts a force in the direction of contraction on chemical reservoir 14 via plunger 106 , and plunger 106 presses bottom 94 of chemical reservoir 14 , causing the liquid in chemical reservoir 14 containing the chemical to expand. The storage area 78 is pressurized based on the elasticity of the coil spring 108 .

In addition, the bottom 94 of the chemical reservoir 14 and the plunger 106, which are in contact in FIGS. , can be separated from each other in the vertical direction.

Since the liquid medicine injection device 10 having such a structure is provided in a state in which the liquid medicine is not injected into the liquid medicine reservoir 14 , the liquid medicine is first injected into the empty liquid medicine reservoir 14 .

That is, before injecting the drug solution, the drug solution injector 10 is held in a state in which the drug solution reservoir 14 is contracted to the maximum, as shown in FIG. In the present embodiment, the projecting portions 102 provided on the bottom portion 94 of the chemical reservoir 14 are engaged with the plurality of small projections 23 projecting from the inner peripheral surface of the housing 12 in the vertical direction. A bottom 94 of the drug reservoir 14 is positioned relative to the housing 12 to hold the drug reservoir 14 in a contracted state. In this manner, the reservoir contraction holding means for holding the liquid medicine reservoir 14 in the contracted state is configured by engaging the projecting portions 102 , 102 forming the bottom portion 94 with the plurality of small projections 23 . Of course, the small protrusions 23 are not essential, and for example, the frictional resistance between the protrusions 102 and 102 and the inner peripheral surface of the housing 12 may ensure a holding force for holding the liquid medicine reservoir 14 in the contracted state. Moreover, the specific shape of the small protrusion 23 is not particularly limited, and may be, for example, a thin flexible piece. Furthermore, in the present embodiment, the small protrusions 23 are formed integrally with the housing body 20 and are hard, but it is also possible to employ elastically deformable small protrusions 23 formed of rubber, resin elastomer, or the like. .

The protruding portions 102, 102 are engaged with the plurality of small protrusions 23 with a small holding force that is released by the pressure (inflow pressure) acting upon the inflow of the liquid medicine when the liquid medicine is filled into the liquid medicine reservoir 14. It is In the present embodiment, the liquid medicine reservoir 14 is adjusted by the engagement margin between the protrusions 102 and 102 and the plurality of small protrusions 23, the inclination of the tip corners of the protrusions 102 and 102, the inclination of the upper and lower surfaces of the small protrusions 23, and the like. The retention force that holds it in the contracted state is adjusted. Further, when the small protrusion 23 is a flexible piece or formed of an elastic material, the holding force can be adjusted by the spring constant of the small protrusion 23 .

Further, the plunger 106 of the actuator 16 is spaced downwardly relative to the bottom 94 of the medicament reservoir 14 . That is, in a state in which the plunger 106 is pushed down to the lowest end and the coil spring 108 is compressed, the operating portion 32 of the slide hook 30 is displaced in the short axis direction (vertical direction in FIG. 7), thereby sliding the housing 12. Hook portion 34 of hook 30 is engaged with hook engaging portion 116 of plunger 106 . As a result, the plunger 106 cannot be displaced upward with respect to the housing 12 and is held at the lowest end against the biasing force of the coil spring 108, so that the bottom portion 94 of the contracted medical fluid reservoir 14 On the other hand, the plunger 106 is held in a downwardly spaced position, and no pressing force from the plunger 106 acts on the liquid medicine reservoir 14 . As described above, in the present embodiment, the locking of the hook portion 34 and the hook locking portion 116 constitutes a pressing release means for releasing the pressing force applied from the plunger 106 to the liquid medicine reservoir 14 .

Then, while the chemical reservoir 14 and the actuator 16 are contracted, the syringe 118 is connected to the syringe connection portion 56 of the housing 12 , and the chemical is injected from the syringe 118 into the chemical reservoir 14 . When injecting the chemical into the chemical reservoir 14 , the tube 120 connected to the tube connector 58 is blocked by a clamp (not shown) to prevent the chemical from flowing out of the chemical outflow port 72 . Further, when injecting the liquid medicine from the syringe 118, the valve body 62 inserted over the syringe connection portion 56 is expanded by the injection pressure of the liquid medicine, so that the blocking of the liquid medicine inlet 60 by the valve body 62 is released. be.

When the liquid medicine flows into the liquid medicine reservoir 14 from the syringe 118, the projections 102, 102 of the liquid medicine reservoir 14 and the small protrusions 23 of the housing 12 are automatically released by the inflow pressure of the liquid medicine. As a result, the liquid medicine reservoir 14 expands according to the inflow amount of the liquid medicine, and the volume of the liquid medicine reservoir area 78 expands, so that the liquid medicine can be smoothly injected with a small resistance, and the liquid medicine in the contracted state is expanded. Since the initial amount of air in the reservoir 14 is small, it is possible to reduce the amount of air remaining in the liquid medicine reservoir area 78 after injection of the liquid medicine.

Moreover, since the plunger 106 of the actuator 16 is positioned and held with respect to the housing 12 by the slide hook 30, the expansion of the chemical reservoir 14 is not hindered by the elasticity of the coil spring 108, and the chemical is supplied with a small pressure. Can be easily injected.

12 is completed, the slide hook 30 of the housing 12 is slid in the short axis direction (horizontal direction in FIG. 8), and the hook portion of the slide hook 30 is 34 and the hook engaging portion 116 of the plunger 106 are released. As shown in FIG. 8, the operation portion 32 of the slide hook 30 has a substantially right-angled triangle shape when viewed from the side, and is thickened toward one side in the short axis direction. The hook portion 34 and the hook locking portion 116 can be easily slid in the direction of releasing the lock. In particular, in this embodiment, an anti-slip projection is provided on the oblique side of the operation portion 32 to facilitate operation. On the other hand, in the state after the slide displacement in which the hook portion 34 and the hook engaging portion 116 are disengaged, the end of the operation portion 32 on the thick side is close to the wall surface of the groove portion 36, so that the operation portion It is difficult to insert a finger between 32 and groove portion 36 to move operation portion 32 to the position before slide displacement, so that the operation portion 32 is prevented from being reused by mistake.

By releasing the engagement between the hook portion 34 and the hook engagement portion 116 in this manner, the plunger 106 is pressed against the bottom portion 94 as shown in FIGS. The chemical reservoir 14 is pressurized based on the elasticity of the coil spring 108 . In this embodiment, since the sponge 98 is arranged between the bottom portion 94 of the liquid medicine reservoir 14 and the plunger 106, when the hook portion 34 and the hook locking portion 116 are unlocked, the bottom portion 94 and the plunger 106 are separated from each other. Abnormal noise caused by hitting is reduced.

By pressurizing the liquid medicine reservoir 14, the valve body 62 is pressed against the outer peripheral surface of the syringe connecting portion 56, and the liquid medicine inlet 60 is blocked. does not occur. In this manner, the valve body 62 functions as a one-way valve that allows the inflow of the chemical liquid to the chemical liquid reservoir 14 and prevents the outflow of the chemical liquid from the chemical liquid reservoir 14 at the chemical liquid inlet 60 .

Furthermore, the blocking by the clamp (not shown) of the tube 120 connected to the tube connection portion 58 is released. One end of the tube 120 is connected to the tube connecting portion 58, and the other end is provided with a connector (not shown) connected to an indwelling needle or the like. By releasing the blockage of the tube 120 by the clamp, the medical fluid stored in the pressurized medical fluid reservoir 14 flows out from the medical fluid outflow port 72 into the lumen of the tube 120 and out of the opening of the connector. do. As a result, the air inside the drug solution reservoir 14 and the injection line 122 including the tube 120 is discharged from the connector to the outside, completing the priming.

By placing the housing 12 on the horizontal surface 124 in a self-supporting state, the drug solution injector 10 of the present embodiment can hold the drug solution reservoir 14 in such a direction that the drug solution outlet 72 is positioned above the drug solution reservoir 14 . It is possible. Therefore, by performing priming with the liquid medicine injector 10 placed on the horizontal surface 124, the air in the liquid medicine reservoir 14 is collected on the side of the liquid medicine outflow port 72, and the air is discharged from the liquid medicine outflow port 72 to the outside. can be done. The holding means of this embodiment is constituted by the mounting surface 77 of the housing 12 that can be mounted on the horizontal surface 124, and particularly the mounting surface 77 is a horizontal plane corresponding to the horizontal surface 124. It consists of

Especially in this embodiment, the tapered surface 92 is formed around the communicating hole 84 in the chemical reservoir 14 , so that the air in the chemical reservoir 14 is easily led to the chemical outlet 72 by the tapered surface 92 . Further, since the periphery of the lower opening of the filter accommodating portion 66 in the cover member 22 is formed as a tapered surface 75, the air entering the inner periphery of the cylindrical engaging portion 86 from the communication hole 84 is injected by the tapered surface 75. It is easy to be led to line 122 . As a result, the air in the chemical reservoir 14 is discharged more efficiently during priming.

After priming is completed, a connector (not shown) connected to the tube 120 is connected to an indwelling needle (not shown) indwelled in the patient's body lumen (such as a blood vessel) to start administering the drug solution to the patient.

Since the filter 68 is arranged at the chemical solution outlet 72, the chemical solution pushed out from the chemical solution storage area 78 to the chemical solution outlet 72 must pass through the filter 68 to remove foreign substances, and then the injection line 122. It is designed to be administered to the patient through the drug solution, and contamination of foreign matter is prevented in the drug solution to be administered. The injection line 122 for connecting the tube connection portion 58 and the indwelling needle and injecting the drug solution from the drug solution reservoir 14 into the patient's body includes, in addition to the tube 120 and the connector, for example, a flow controller, a clamp, and a PCA (not shown). It may be equipped with a device or the like.

Furthermore, the upper side (patient side) of the communication port 74 of the drug solution outlet 72 is provided with an inclined tapered surface 70, and the cross-sectional area of the drug solution outlet 72 is smaller above the communication port 74. ing. As a result, the flow velocity of the chemical passing through the filter 68 is reduced while preventing air from remaining in the chemical outflow port 72 due to the difference in level, and the chemical slowly passes through the filter 68, thereby improving the foreign matter removal performance. is planned.

Furthermore, the communication port 74 of the chemical outflow port 72 is provided with an inclined tapered surface 75 below the filter 68 (on the side of the chemical reservoir). By guiding the air to the inner periphery of the filter accommodating portion 66 , it becomes difficult for the air to remain in the inner peripheral region of the reservoir connecting portion 52 .

The flow rate (flow velocity) of the chemical solution per unit time is set by the flow resistance of the injection line 122, etc., and the bottom 94 of the chemical solution reservoir 14 is pushed upward by the plunger 106 due to the elasticity of the coil spring 108. However, the drug solution reservoir 14 does not shrink significantly at once. That is, the chemical reservoir 14 pressurized by the plunger 106 gradually contracts in the vertical direction due to the deformation of the bellows, and the contraction of the chemical reservoir 14 causes the chemical to flow from the chemical reservoir region 78 to the chemical outlet 72 little by little. outflow. The drug solution flowing out from the drug solution outlet port 72 to the injection line 122 is continuously injected into the patient's body by a predetermined amount through an indwelling needle (not shown) connected to the injection line 122 .

In this embodiment, indicator lines 110 are provided on the outer peripheral surface of the plunger 106, and scale lines 28 are provided on the peripheral wall of the housing 12 which is transparent or translucent. 28, it is possible to externally grasp the remaining amount of the liquid medicine in the liquid medicine reservoir 14, the time until the injection is completed, and the like. In particular, in this embodiment, the chemical reservoir 14 has a bellows structure so that the deformation of the chemical reservoir 14 is uniform and the change in shape of the chemical reservoir 14 in the direction perpendicular to the axis is suppressed. With the line 110 and the scale line 28, it is possible to more accurately grasp the remaining amount of the liquid medicine in the liquid medicine reservoir 14 and the time until the injection is completed.

In order to continuously inject the drug solution over a long period of time, the drug solution injection device 10 may be carried in, for example, the pocket of the patient's clothes. Since the liquid injection device 10 of the present embodiment has a flat cross-sectional shape of the housing 12, it is not bulky when it is carried in a breast pocket of clothes, etc., and the pocket portion is less bulky and protruding. be. Therefore, the drug solution injector 10 is easier to carry than the conventional one with a circular cross section, and is suitable for long-term use. In particular, since the housing 12 of this embodiment has a substantially elliptical cross-sectional shape, it is less likely that the corners will be stretched or protrude, making it easier to carry.

Moreover, since the liquid medicine reservoir 14 has a flat cross-sectional shape, it is possible to obtain a sufficiently large volume of the liquid medicine storage region 78 while allowing the flat cross-sectional shape of the housing 12 . . In addition, since the chemical reservoir 14 is bag-shaped, the fluid tightness of the chemical reservoir region 78 to the outside can be ensured regardless of the cross-sectional shape of the chemical reservoir 14 .

Furthermore, the plunger 106 also has a flat cross-sectional shape corresponding to the liquid reservoir 14, but the two coil springs 108, 108 arranged side by side in the longitudinal direction of the plunger 106 cause the plunger 106 to tilt. is becoming less likely to occur. In this embodiment, the inclination of the plunger 106 with respect to the housing 12 is also restricted by the guide tube portion 112 provided at the outer peripheral end of the plunger 106 .

Finally, as shown in FIG. 13, when the drug solution reservoir 14 is contracted to the state before it is filled with the drug solution and the injection of the drug solution into the patient is completed, the connector (not shown) is removed from the indwelling needle. The used injection line 122 and the liquid injection device 10 can be washed and reused, but it is desirable to discard them in consideration of hygiene. In short, the drug solution injector 10 of this embodiment is a disposable type.

In the contracted state of the liquid medicine reservoir 14 shown in FIG. 13, the extrusion protrusion 100 provided on the bottom portion 94 of the liquid medicine reservoir 14 is inserted into the cylindrical engaging portion 86 of the cover member 22 through the communication hole 84 of the liquid medicine reservoir 14. be done. As a result, the amount of the liquid medicine remaining on the inner periphery of the cylindrical engaging portion 86 after the injection of the liquid medicine is completed is reduced.

Although the embodiments of the present invention have been described above, the present invention is not to be construed as being limited by the specific descriptions in such embodiments, and various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art. It is possible to implement in a mode in which

For example, in the above-described embodiment, the filter 68 is provided in the communication port 74 of the drug solution outlet 72 to the drug solution reservoir region 78, but the filter 68 may be provided on the inner circumference of the tube connection portion 58. good.

Further, in the above-described embodiment, the holding means for holding the liquid medicine reservoir 14 in a specific orientation is configured by the flat lower surface of the housing 12 that can be placed on the flat horizontal surface 124. The holding means can also be configured by providing projections protruding downward at a plurality of circumferential locations on the lower surface so that the housing 12 can be placed on the horizontal surface 124 by these projections. This makes it possible to stably place the housing 12 even on a support surface that is not necessarily flat. Furthermore, the holding means can be constituted by a separate stand on which the housing 12 can rest on a support surface. Further, for example, it is possible to hold the chemical reservoir 14 in a specific orientation by providing a hook for holding the housing 12 in a specific orientation while it is hung on a wall surface or the like.

Further, the housing 12, the liquid reservoir 14, and the plunger 106 preferably have flat cross-sectional shapes in directions corresponding to each other, but are not necessarily limited to elliptical cross-sectional shapes. It can be a flattened polygon such as a rectangle. Further, if the housing 12, the chemical reservoir 14, and the plunger 106 have a flat shape in which the outer dimensions in the direction perpendicular to the axis change in the circumferential direction, the maximum outer dimensions and the minimum outer dimensions can be appropriately set. Furthermore, the flattened housing 12, chemical reservoir 14, and plunger 106 may have a cross-sectional shape having a long axis and a short axis like the oval cross-section shown in the above embodiment. , a shape that does not have a distinct major axis and minor axis (flat variant, etc.). Also, the housing 12 and the medicament reservoir 14 need not have corresponding cross-sectional shapes, for example, a housing with an oval cross-section and a medicament reservoir with a rectangular cross-section can be combined. The same applies to the cross-sectional shape of the housing and plunger, or the chemical reservoir and plunger.

Furthermore, in the above-described embodiment, a plurality of coil springs 108 are arranged side by side in the longitudinal direction of the plunger 106 in order to prevent the plunger 106 having a flat cross-sectional shape from tilting. Only one may be arranged in the central portion. In addition, when the coil spring 108 is one, it may be of a general cylindrical shape.

Furthermore, the spring member is not limited to the coil spring 108 exemplified in the above embodiment.

Further, the pressing release means is not limited to the lock by the slide hook 30 shown in the above embodiment. For example, a pin can be inserted through a hole penetrating the peripheral wall of the housing 12, and the pin inserted through the hole can be locked to the upper surface of the plunger 106, thereby holding the plunger 106 at the lowest end and allowing the pin to be inserted. The plunger 106 may be pulled out of the hole to release the engagement of the pin with the coil spring 108 so that the elastic force of the coil spring 108 is exerted on the drug solution reservoir 14 .

Furthermore, the reservoir contraction holding means is not limited to the locking of the protrusions 102, 102 and the small projections 23 shown in the above embodiment. With a pin that can be inserted into and removed from, it is possible to switch between holding and releasing the contracted state of the liquid medicine reservoir 14 . Further, for example, a coil spring having a small spring constant that is contracted by the inflow pressure of the chemical may be provided separately from the spring member as the reservoir contraction and holding means.

In the above embodiment, the case where the liquid medicine injector 10 is provided in an empty state without being filled with the liquid medicine and is filled with the liquid medicine before use has been described. can also In this case, the drug solution outlet 72 is closed with a plug or the like so that the drug solution does not spill out from the drug solution outlet 72 before use.

10: chemical injection device, 12: housing, 14: chemical reservoir, 23: small projection (reservoir contraction holding means), 30: slide hook (press releasing means), 68: filter, 70: tapered surface, 72: chemical outlet , 74: communication port, 75: tapered surface, 77: lower surface (holding means), 78: drug solution storage area, 92: tapered surface, 94: bottom portion, 98: sponge (buffer), 102: projecting portion (reservoir shrinkage holding means), 106: plunger, 108: coil spring (spring member), 116: locking portion (press release means), 124: horizontal surface (support surface)

Claims (11)

A chemical injection device comprising a chemical reservoir having a chemical storage area, a chemical outlet communicating with the chemical storage area, and causing the chemical stored in the chemical reservoir to continuously flow out from the chemical outlet. in the instrument,
The medical liquid reservoir has a bellows structure, and the medical liquid stored in the medical liquid storage region of the medical liquid reservoir can be continuously discharged from the medical liquid outlet by contraction of the medical liquid reservoir. on the other hand,
A liquid medicine characterized in that the cross section of the liquid medicine reservoir is flattened, and the cross section of a hard housing that houses the liquid medicine reservoir is flattened in a direction corresponding to the liquid medicine reservoir. injection device. 2. The liquid medicine reservoir according to claim 1, wherein a spring member is provided to exert a force in the direction of contraction on the liquid medicine reservoir, and a plurality of said spring members are arranged in parallel in the longitudinal direction of the cross section of the liquid medicine reservoir. Liquid injection device. 3. The drug solution injector according to claim 1, wherein both the cross section of the drug solution reservoir and the cross section of the housing are oval. A plunger is provided for pressing the bottom of the chemical reservoir to contract the chemical reservoir, the bottom of the chemical reservoir and the plunger are separable, and reservoir contraction holding means for holding the chemical reservoir in a contracted state. 4. The liquid injector according to any one of claims 1 to 3, further comprising a pressing force releasing means for releasing a pressing force exerted by the plunger on the liquid medicine reservoir. A chemical injection device comprising a chemical reservoir having a chemical storage area, a chemical outlet communicating with the chemical storage area, and causing the chemical stored in the chemical reservoir to continuously flow out from the chemical outlet. in the instrument,
A chemical injection device, comprising: a plunger that presses the bottom of the chemical reservoir to contract the chemical reservoir, and the bottom of the chemical reservoir and the plunger are separable. 6. The liquid injection method according to claim 5, further comprising reservoir contraction holding means for holding the liquid medicine reservoir in a contracted state, and pressure release means for releasing the pressure applied from the plunger to the liquid medicine reservoir. instrument. A hard housing that houses the liquid medicine reservoir is provided with a small protrusion protruding inward, and the liquid medicine reservoir is engaged with the small protrusion to form the reservoir contraction holding means. Item 7. The chemical injection device according to item 6. 8. The drug solution injector according to claim 7, wherein the reservoir contraction holding means is constructed by locking the drug solution reservoir against the small projection with a force that can be released by the inflow pressure of the drug solution. A rigid housing containing the plunger is provided, and a spring member is provided between the plunger and the bottom of the housing to bias the plunger toward the bottom of the reservoir, 9. The liquid injector according to any one of claims 6 to 8, further comprising the pressure releasing means that enables the plunger to be held at a position away from the liquid medicine reservoir against the urging force of the spring member. The drug solution injector according to any one of claims 5 to 9, wherein the drug solution reservoir has a bellows structure. The drug solution injector according to any one of claims 5 to 10, wherein a buffer is arranged between the bottom of the drug solution reservoir and the plunger.

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