Patent Application
20230338188
The present invention relates to a liquid discharge device that discharges a small amount of liquid. Further, the present invention relates to a dosing device that can be suitably used in a case where a small amount of a liquid medicine such as eye drops are administered to an eyeball or the like of a patient.
In recent years, with the aging of patients, the number of patients who cannot administer the eye drops while looking upward or who cannot accurately drop the eye drops onto the surface of the eyeball is increasing. In addition, a patient with rheumatism or a patient with poor grip strength cannot press an eye-drop container by himself or herself or cannot open the eye-drop container.
In addition, it is said that the maximum amount of eye drops that can be held on the surface of the human eyeball is about 7 μL. Therefore, in a case where as much as 25 to 50 μL of eye drops are dropwise administered as in the related art, not only an excessive amount of eye drops inevitably flow out of the eye to cause the medicine not to be effectively utilized, but also there is a concern that the eye drops are absorbed by tissues around the eye and side effects associated with migration to the whole body are caused.
Therefore, an eyeglass-type ophthalmic device that administers a small amount of drug to the eye has been proposed (Patent Document 1 and Patent Document 2).
In Patent Document 1, a thermal jet type dispenser is employed as liquid injection means (refer to FIGS. 5 and 6 of Patent Document 1), and in Patent Document 2, a piezo jet type dispenser or a thermal jet type dispenser is employed.
Patent Document 1: WO 1994/003135 A
Patent Document 2: JP 2005-21701 A
However, the flying distance of the liquid medicine by the thermal jet type or the piezo jet type as in Patent Documents 1 and 2 is only about several millimeters in the horizontal direction, and it is difficult to perform accurate administration unless the discharge port is brought close to the eyeball. Therefore, there is a problem that it is difficult to perform the medication in a state of facing the front, and the accuracy of the administration is poor in a case where the medication is directly performed by his/her hand or in a case where the medication is performed by a third party such as a doctor. In addition, the device and the like are complicated, and thus, there is a problem that the product cost could increase.
Therefore, an object of the present invention is to provide a liquid discharge device capable of discharging a predetermined small amount of liquid. In addition, another object of the present invention is to provide a dosing device capable of easily administering a predetermined small amount of a liquid medicine even by a person who is difficult to administer a liquid medicine by himself or herself, a doctor, or the like.
An aspect of the present invention for resolving the above-described problem is a liquid discharge device including: a liquid storage portion; a tube member; a striking portion; an operation portion; and a discharge port capable of discharging liquid, wherein the tube member has an end portion communicating with an inside of the liquid storage portion, the tube member delivering the liquid from the liquid storage portion to a discharge port side, wherein the tube member has an elastic region elastically deformable at least partly in a longitudinal direction, and wherein when the operation portion is operated, at least a part of the elastic region of the tube member is struck with an impact force by the striking portion to allow the liquid in the tube member to be pushed out and discharged from the discharge port.
The term “strike with an impact force or strike” as used herein means to strike by applying an impact force.
The term “liquid” as used herein refers to one having fluidity, and includes a liquid medicine, oil, water, an organic solvent, an aqueous solution, an ionic liquid, and the like.
In a preferable aspect, the tube member delivers the liquid from the liquid storage portion to the discharge port side by capillarity.
In a preferable aspect, an entire region of the tube member constitutes the elastic region.
In a preferable aspect, the elastic region is formed of at least one elastic material selected from the group consisting of polyethylene, polypropylene, silicone, fluororubber, polytetrafluoroethylene, nylon, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, natural rubber, and synthetic rubber.
In a preferable aspect, a maximum inner diameter of the elastic region in the tube member is 0.1 mm or more and 2 mm or less.
The term “maximum inner diameter” as used herein refers to the smallest enclosing circle diameter of the internal space of the tube member in the cross section orthogonal to the extension direction of the tube member, and refers to the diameter of the smallest circle including the entire internal space.
In a preferable aspect, a discharge amount of the liquid from the discharge port when the operation portion is operated once is 0.01 μL or more and 100 μL or less.
In a preferable aspect, an area of the tube member struck by the striking portion is a range of 1 mm or more and 30 mm or less in a longitudinal direction.
In a preferable aspect, when the operation portion is operated with the discharge port facing a horizontal direction, the liquid is discharged from the discharge port substantially linearly at least in a range of more than 0 cm and 0.5 cm or less.
The term “substantially linearly” as used herein includes not only a case of being completely linear but also a case of being slightly curved to an extent of being regarded as almost linear due to the influence of gravity or the like. Specifically, the angle of the straight line connecting the start point (liquid discharge port) and the end point is 5 degrees or less, preferably 3 degrees or less, and more preferably 1 degree or less.
In a preferable aspect, the liquid discharge device further includes: a main body portion; and a liquid cartridge, wherein the main body portion includes the striking portion and the operation portion, and wherein the liquid cartridge includes the liquid storage portion and the tube member, the liquid cartridge being attachable to and detachable from the main body portion.
In a preferable aspect, the liquid discharge device further includes: a case portion accommodating at least a part of the tube member so as to incorporate the discharge port therein; and a closing portion configured to move or change a posture relative to the case portion, following a movement of the operation portion, the case portion having a liquid passage hole at a position facing the discharge port, wherein the liquid discharge device includes: a closed state where the closing portion closes the liquid passage hole; and an open state where the closing portion opens the liquid passage hole, the closed state and the open state being changeable when the operation portion is operated to move or to change a posture of the closing portion.
In a preferable aspect, the liquid discharge device further includes a case member; and a striking member having the striking portion, wherein the striking member has a connection portion supported in a cantilever manner by the case member, wherein the elastic region of the tube member is at a position higher than the connection portion, and wherein when the operation portion is operated, the striking member is elastically deformed to allow the striking portion to strike at least a part of the elastic region by a restoring force.
An aspect of the present invention is a liquid discharge device including: a liquid storage portion; a tube member; a striking portion; an operation portion; and a discharge port, wherein the tube member has a first end portion immersed in liquid inside the liquid storage portion, and a second end communicating with an outside via the discharge port, wherein the tube member has an elastic region at an intermediate portion in a longitudinal direction, the elastic region being elastically deformable and having a maximum inner diameter of 0.1 mm or more and 2 mm or less, and wherein when the operation portion is operated, at least a part of the elastic region of the tube member is struck with an impact force by the striking portion to allow the liquid inside the liquid storage portion to be pushed out and to be discharged from the discharge port.
The term “intermediate portion” as used herein refers to a portion between opposing end portions.
An aspect of the present invention is a dosing device using the liquid discharge device described above, wherein the liquid is a liquid medicine.
An aspect of the present invention is a liquid discharge device including: a liquid storage portion; a tube member; a striking portion; a struck portion; an operation portion; and a discharge port capable of discharging liquid, wherein the tube member has an end portion communicating with an inside of the liquid storage portion, the tube member delivering the liquid from the liquid storage portion to a discharge port side, wherein the tube member has an elastic region elastically deformable at least partly in a longitudinal direction, wherein when the operation portion is operated in a state where the tube member is positioned close to a struck portion side between the striking portion and the struck portion, at least a part of the elastic region of the tube member is struck with an impact force by the striking portion without the struck portion moving to the striking portion, thereby the striking portion pressing the tube member to the struck portion side to sandwich the tube member together with the struck portion, so that the liquid in the tube member is pushed out and discharged from the discharge port, and wherein the tube member is replenished with the liquid from the liquid storage portion by capillarity, the capillarity being caused when a shape of the tube member is restored from a state elastically deformed by a pressing force of the striking portion.
An aspect of the present invention is a dosing device including: a liquid medicine storage portion; an operation portion; and a discharge port, wherein a liquid medicine in the liquid medicine storage portion is discharged to a surface of an eyeball when the operation portion is operated, and wherein when the operation portion is operated 10 times, a single discharge amount from the discharge port is less than 7 μL and a standard deviation is 0.05 or less.
In a preferable aspect, the single discharge amount from the discharge port is less than 1 μL when the operation portion is operated 10 times.
In a preferable aspect, the liquid discharging device further includes: a main body; and a plurality of liquid medicine cartridges (storage members) that can be attached to the main body portion separately, wherein each of the plurality of liquid medicine cartridges includes: the liquid medicine storage portion; and the discharge port, wherein the plurality of liquid medicine cartridges include: a first liquid medicine cartridge (first storage member); and a second liquid medicine cartridge (second storage member), and wherein when the operation portions is operated, liquid medicine of the first liquid medicine cartridge and liquid medicine of the second liquid medicine cartridge can be simultaneously discharged from the respective discharge ports.
With the liquid discharge device of the present invention, it is possible to discharge a predetermined small amount of liquid.
With the dosing device of the present invention, it is possible to easily perform administration even by a person who is difficult to perform administration or by a doctor or the like at the time of medical examination.
Hereinafter, embodiments of the present invention will be described in detail. In the following description, unless otherwise specified, an eyeball 101 side of a patient is defined as the front side, and the distal side as viewed from the patient is defined as the rear side, based on a posture (vertical posture) in
A dosing device 1 (liquid discharge device) of the first embodiment of the present invention includes a discharge port 8 on an end surface as illustrated in
One of the features of the dosing device 1 is that, as illustrated in
The dosing device 1 includes, as main components, a case member 2, a striking member 3, a liquid medicine unit 4, an energizing member 7, and the discharge port 8 as illustrated in
The liquid medicine unit 4 mainly includes a liquid medicine storage portion 5 (liquid storage portion) and a tube member 6.
As illustrated in
The first case portion 10 includes a main body wall portion 20, side wall portions 21 to 24, and a shaft portion 25.
The main body wall portion 20 is a substantially quadrangular wall portion, and the side wall portions 21 to 24 are standing wall portions standing from each side of the main body wall portion 20.
The shaft portion 25 is a rod-shaped part erected with respect to the main body wall portion 20, and is a part forming a rotation axis of the striking member 3 at the time of assembly. The shaft portion 25 is also a fixing portion for fixing the energizing member 7.
As illustrated in
The main body wall portion 30 is a substantially quadrangular wall portion, and the side wall portions 31 to 34 are standing wall portions standing from each side of the main body wall portion 30.
The guide groove 35 is a groove for guiding the striking member 3, and is a through-groove that is provided in the main body wall portion 30, and penetrates the main body wall portion 30 in a thickness direction. The guide groove 35 extends in an arc shape in a circumferential direction around the shaft fixing hole 36 when the main body wall portion 30 is viewed from the front.
As illustrated in
As illustrated in
The main body portion 50 is a hammer piece including a first extending portion 55, and a second extending portion 56 extending obliquely from an end portion of the first extending portion 55.
The first extending portion 55 includes a fixing portion 57 capable of fixing the end portion of the energizing member 7.
The striking portion 51 is a part that strikes a part of the tube member 6 with an impact force to discharge the liquid medicine 100 from the discharge port 8. That is, the striking portion 51 is a part that partially presses the tube member 6 to forcibly discharge the liquid medicine 100 in the tube member 6 from the discharge port 8.
As illustrated in
The projecting portion 59 is a ridge which forms a pair with a recessed portion 69 of the liquid medicine storage portion 5 and extends to cross the tube member 6 when assembled. That is, the projecting portion 59 extends in a direction intersecting an extension direction of the tube member 6, and is provided on the upstream side of the striking portion 51 in a capillarity flow direction of the liquid medicine 100 of the tube member 6.
The operation portion 52 is a part for operating the striking portion 51, and is a rod-shaped part that is provided on the second extending portion 56 and erected with respect to the second extending portion 56.
The shaft hole 53 is an insertion hole into which the shaft portion 25 can be inserted, and is a through-hole provided on the proximal end side of the first extending portion 55 and penetrating the first extending portion 55 in the thickness direction.
As illustrated in
As illustrated in
As illustrated in
The struck portion 62 is a part which is struck with an impact force by the striking portion 51 of the striking member 3 via the tube member 6, and includes a flat portion 68, and the recessed portion 69 recessed with respect to the flat portion 68.
The recessed portion 69 is a recessed groove extending to cross the tube member 6 when assembled, and extends in a direction intersecting the extension direction of the tube member 6.
The storage hole 63 is a bottomed hole having a depth linearly in a front-rear direction from the front end surface of the liquid medicine storage portion 5, and is a hole that causes the storage space 65 to communicate with the outside.
The communication hole 64 is a through-hole that causes the storage space 65 to communicate with the outside and extends vertically or obliquely from the outside toward the storage space 65, and is also an insertion hole into which the tube member 6 can be inserted.
As illustrated in
The through-hole 66 is an air hole for outside air introduction, which introduces air into the storage space 65 from the outside, and is a through-hole penetrating in the thickness direction. That is, the through-hole 66 is a hole for introducing the outside air into the storage space 65 and constantly keeping the internal pressure and the external pressure in the liquid medicine storage portion 5 equal.
Note that the perimeter of the through-hole 66 may be subjected to hydrophilic processing or hydrophobic processing as necessary so that the liquid medicine 100 does not leak from the through-hole 66. In this manner, the liquid medicine 100 is less likely to leak from the through-hole 66.
As illustrated in
The tube member 6 has a cylindrical body that is hollow inside and extends with a length. The tube member 6 of the present embodiment is a cylindrical tube, and has a circular cross-sectional shape.
The tube member 6 has an elastic region in which at least a part in the longitudinal direction is formed of an elastic body, and the elastic region is elastically deformable in a direction intersecting the longitudinal direction.
In the tube member 6 of the present embodiment, the entire region in the longitudinal direction is an elastic region.
The tube member 6 is not particularly limited as long as it is elastically deformable, and can be formed of, for example, at least one elastic material selected from the group consisting of polyethylene, polypropylene, silicone, fluororubber, polytetrafluoroethylene, nylon, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, natural rubber, and synthetic rubber.
By using these elastic materials, a desired amount of the liquid medicine 100 can be reproducibly discharged.
In addition, the tube member 6 preferably has lipophilicity in a case where the liquid medicine is an oily preparation, and hydrophilicity in a case where the liquid medicine is an aqueous preparation, from the viewpoint of replenishing the liquid medicine 100 therein by capillarity.
The inner diameter (maximum inner diameter) of the tube member 6, that is, the smallest enclosing circle diameter of the internal space of the tube member 6 in the cross section orthogonal to the extension direction of the tube member 6 may be within a range in which the liquid medicine 100 can be transferred by capillarity, and is preferably 0.1 mm or more and 2 mm or less, and more preferably 0.3 mm or more and 1.5 mm or less.
The outer diameter (maximum outer diameter) of the tube member 6, that is, the smallest enclosing circle diameter of the outer surface of the tube member 6 in the cross section orthogonal to the extension direction of the tube member 6 is larger than the inner diameter of the tube member 6, and is preferably 0.2 mm or more and 5 mm or less.
The thickness (difference between the outer diameter and the inner diameter) of the tube member 6 is preferably 0.05 mm or more and 3 mm or less.
Within these ranges, the pressing force by the striking portion 51 is not excessively absorbed in the tube member 6, and can be efficiently transmitted to the internal liquid medicine 100.
The inner surface of the tube member 6 in liquid contact may be subjected to a hydrophobizing treatment or a hydrophilizing treatment as necessary.
The energizing member 7 is a member that energizes the striking portion 51 toward the liquid medicine storage portion 5.
Specifically, as illustrated in
The coil portion 80 is an annular part, and the shaft portion 25 can be inserted at the center thereof.
The arm portions 81 and 82 are rod-shaped parts extending from the coil portion 80.
The discharge port 8 is an opening through which the liquid medicine 100 is discharged, and the discharge port 8 of the present embodiment is formed of an end portion of the tube member 6.
Subsequently, the positional relationship of the members of the dosing device 1 according to the first embodiment will be described.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
The striking portion 51 receives the energizing force of the energizing member 7, and presses a part of the tube member 6 toward the liquid medicine storage portion 5.
As illustrated in
The tube member 6 is sandwiched between the struck portion 62 of the liquid medicine storage portion 5 and the striking portion 51 of the striking member 3, and a pressed portion 85 (
The projecting portion 59 of the striking portion 51 presses a portion of the tube member 6 corresponding to the recessed portion 69 of the struck portion 62.
The length of the striking part of the striking portion 51 illustrated in
Within this range, the liquid medicine 100 in the tube member 6 can be discharged with good reproducibility.
Subsequently, a general process assumed in a case where a patient uses the dosing device 1 to administer the drug to the surface of the eyeball 101 will be described. Note that the dosing device 1 can take any posture, and can administer the liquid medicine 100 from any direction such as upward, downward, or sideways, but in order to facilitate understanding of the features of the present invention, a case where the liquid medicine 100 can be discharged in the horizontal direction will be described.
First, as illustrated in
In this case, as illustrated in
Then, as illustrated in
In this case, the liquid medicine 100 discharged from the discharge port 8 is a small amount of the liquid medicine 100, and is substantially linearly discharged from the discharge port 8 at least in a range of more than 0 cm and 0.5 cm or less.
Further, the discharge amount of the liquid medicine 100 from the discharge port 8 in this case is preferably 0.01 μL or more and 100 μL or less, more preferably 0.1 μL or more and 10 μL or less, particularly preferably 0.1 μL or more and 7 μL or less, and still particularly preferably 0.1 μL or more and less than 1 μL.
Within this range, it is possible to prevent excessive administration of the liquid medicine 100, and it is possible to reduce problems caused by excessive administration, side effects caused by preservatives and the like.
A method of adjusting the discharge amount of the liquid medicine 100 from the discharge port 8 is not particularly limited, but the discharge amount can be adjusted by, for example, changing the length D of the striking part of the striking portion 51 or changing the inner diameter of the tube member 6.
Subsequently, the liquid medicine 100 that can be suitably used in the dosing device 1 will be described.
The liquid medicine 100 is not particularly limited as long as it is used as an ophthalmic drug.
The liquid medicine 100 is preferably any one of an oily preparation, an aqueous preparation, an aqueous suspension preparation, an oily suspension preparation, and an emulsion preparation, and more preferably an oily preparation.
The solvent that can be used as the base of the liquid medicine 100 is not particularly limited as long as it is liquid in a temperature range from a cold place to room temperature. Examples of the solvent include water, ethyl alcohol, ethylene glycol, polyethylene glycols, propylene glycol, medium-chain fatty acid triglycerides, glycerin, liquid paraffin, vegetable oil, animal oil, mineral oil, perfluorocarbons, and the like, and mixtures thereof.
Examples of the drug of the liquid medicine 100 include anti-inflammatory agents such as dipotassium glycyrrhizinate, epsilon aminocaproic acid, allantoin, berberine chloride, and berberine sulfate; antihistamines such as diphenhydramine hydrochloride and chlorpheniramine maleate; corneal therapeutic agents such as flavin adenine dinucleotide sodium, cyanocobalamin, retinols, pyridoxine hydrochloride, panthenol, sodium pantothenate, and sodium chondroitin sulfate; decongestants such as epinephrine, ephedrine hydrochloride, tetrahydrozoline hydrochloride, naphazoline hydrochloride, phenylephrine hydrochloride, and dl-methylephedrine hydrochloride; antibacterial agents such as ofloxacin, levofloxacin, tosufloxacin, gatifloxacin, gentamicin, sulfamethoxazole, and sulfisoxazole; β-lactam antibiotics such as cephalexin, imipenem, and meropenem; antifungal agents such as amphotericin B, ketoconazole, and fluconazole; cooling agents such as menthol, borneol, and camphor; therapeutic agents for glaucoma and ocular hypertension such as timolol maleate, pilocarpine hydrochloride, carteolol, latanoprost, tafluprost, travoprost, and Ripasudil; therapeutic agents for cataract such as phacolysine, glutathione, pirenoxine, and sodium pentacesylsulfonate; antibiotics such as chloramphenicol, colistin, and erythromycin; immunosuppressants such as rapamycin, tacrolimus, and cyclosporin; adrenocortical hormone agents such as hydrocortisone acetate, prednisolone acetate, dexamethasone, triamcinolone acetonide, and fluorometholone; carbonic anhydrase inhibitors such as brinzolamide, dorzolamide, and methazolamide; α2 agonists such as brimonidine; al blockers such as bunazosin; antioxidants such as tocopherols and vitamin C; mucosal repair agents (dry eye therapeutic agents) such as hyaluronic acid, chondroitin sulfate ester, gefarnate, vitamin U, and rebamipide; local anesthetics such as lidocaine hydrochloride and dibucaine hydrochloride; test agents such as fluorescein, rose bengal, cyclopentolate, and tropicamide; protein preparations; antibody preparations; and nucleic acid preparations.
The viscosity of the liquid medicine 100 is not particularly limited, but is preferably 10,000 cps or less, more preferably 1,000 cps or less, and still more preferably 300 cps or less.
With the dosing device 1 of the first embodiment, since the liquid medicine 100 is discharged from the discharge port 8 by operating the operation portion 52, the patient does not need to face upward, and the liquid medicine 100 can be administered from any direction without depending on gravity. Therefore, even a person who is difficult to take medication such as a patient who is difficult to change his/her posture, an elderly person, a rheumatism patient, or a patient with poor grip strength can accurately administer a predetermined small amount of the liquid medicine 100 to the surface of the eyeball 101 of the patient. As a result, it is possible to improve patient convenience, prevent excessive administration of the liquid medicine 100, and reduce side effects of the preservatives.
Further, with the dosing device 1 of the first embodiment, since the patient does not need to face upward, in a case where the test agent is instilled into the eye in the ophthalmic examination room, the liquid medicine 100 can be administered while the patient is sitting, and convenience can be improved.
With the dosing device 1 of the first embodiment, the amount of the liquid medicine to be discharged (for example, 0.001 to 7 μL) is much smaller than the amount of drops (25 to 50 μL) by dropwise administration of conventional eye drops. Therefore, the amount of the liquid medicine 100 discharged onto the surface of the eyeball 101 is small, and there is no possibility that the liquid medicine 100 flows out of the eye, and all the liquid medicine can be effectively used.
In addition, with the dosing device 1 of the first embodiment, it is possible to administer a smaller amount of the liquid medicine 100 than that by the dropwise administration from the conventional eye-drop container, and the influence of the liquid medicine 100 on the living body is also reduced. Therefore, the degree of freedom in design of the liquid medicine 100 is high, for example, so that it is possible to provide a wide pH range, a wide osmotic pressure range, and a wide viscosity range in liquid medicine design. In addition, the oily liquid medicine 100 can also be administered without disquiet.
Furthermore, with the dosing device 1 of the first embodiment, since the liquid medicine 100 to be administered to the surface of the eyeball 101 can be reduced to a small amount of droplets, it is possible to prevent the patient from feeling disquiet or feeling irritation in the eyeball 101.
With the dosing device 1 of the first embodiment, by operating the operation portion 52, a part of the tube member 6 is struck by the striking portion 51, and a part of the liquid medicine 100 in the tube member 6 is pushed out and discharged from the discharge port 8. Therefore, a small amount of the liquid medicine 100 can be linearly discharged.
With the dosing device 1 of the first embodiment, the tube member 6 delivers liquid from the liquid medicine storage portion 5 toward the discharge port 8 by capillarity. Therefore, the liquid medicine 100 can be automatically and easily replenished into the tube member 6.
With the dosing device 1 of the first embodiment, since the entire region of the tube member 6 constitutes the elastic region, the tube member 6 is not needed to combine a plurality of types of elastic materials, leading to easy manufacturing.
With the dosing device 1 of the first embodiment, by operating the operation portion 52, the posture of the striking portion 51 is changed against the energizing force from the energizing member 7, and the striking portion 51 strikes the tube member 6 with the energizing force. That is, since the striking can be made by the energizing force of the energizing member 7, the liquid medicine 100 can be more accurately discharged from the discharge port 8.
With the dosing device 1 of the first embodiment, by operating the operation portion 52 in a state where the discharge port 8 faces the horizontal direction, the liquid medicine 100 is substantially linearly discharged from the discharge port 8 at least in a range of more than 0 cm and 0.5 cm or less. Therefore, even in a case where a third person such as a doctor, a nurse, or a caregiver performs medication, the medication can be easily performed.
With the dosing device 1 of the first embodiment, the projecting portion 59 is provided on the upstream side of the striking portion 51 in the flow direction of the liquid medicine 100 of the tube member 6 due to the capillarity. Therefore, in a case where the tube member 6 is struck by the striking portion 51, the projecting portion 59 can block the movement of the liquid medicine 100 toward the liquid medicine storage portion 5, and the liquid medicine 100 can be more accurately discharged from the discharge port 8.
Subsequently, a dosing device 500 of a second embodiment of the present invention will be described. The same components as those of the dosing device 1 of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. The same applies hereinafter. Similarly to the first embodiment, the dosing device 500 can take any posture, and can administer the liquid medicine 100 from any direction such as upward, downward, or sideways, but in order to facilitate understanding of the features of the present invention, a description will be given on the basis of a posture in which the liquid medicine 100 can be discharged in the horizontal direction and an operation member 512 is on the upper side.
As illustrated in
As illustrated in
As illustrated in
As can be seen from
The case member 510 includes an internal space 542 surrounded by the wall portions 530 to 533 and 535.
As illustrated in
The liquid medicine passage hole 550 is a hole through which the liquid medicine discharged from the discharge port 8 of the liquid medicine cartridge 502 passes.
The case-side restriction groove 551 is a groove that restricts the movement direction of a closing portion 583 that closes the discharge port 8 of the liquid medicine cartridge 502 of the operation member 512, and the depth thereof is longer than the length of the closing portion 583 of the operation member 512.
As illustrated in
As illustrated in
As illustrated in
The top wall portion 532 includes a communication hole 560 penetrating in the vertical direction from the outside toward the internal space 542 and communicating with the internal space 542.
The communication hole 560 is an insertion hole into which an operation-side pressing portion 585 and an operation-side engagement portion 586 of the operation member 512 can be inserted, and is also continuous with the restriction groove 556 of the attachment portion 555.
As illustrated in
The guide portions 561 are triangular plate-shaped parts that guide a main body plate portion 595 of the operation member 512 toward the side wall portion 535b.
The guide portions 561 of the present embodiment are configured by arranging a plurality of right triangular plate-shaped pieces in the front-rear direction, and an inclined portion 562 is formed on the side of the guide portion 561 close to the side wall portion 535 by an inclined surface of each plate-shaped piece.
As illustrated in
The slide grooves 565 and 566 are restriction grooves that restrict the sliding direction of leg portions 588 and 589 of the operation member 512 in the vertical direction.
The locking grooves 567 and 568 are parts that extend in the vertical direction, are locked with locking claws 590 and 591 of side wall portions 581 and 582, and prevent separation of the operation member 512 from the case member 510.
That is, in the locking grooves 567 and 568, the inner wall portions positioned at the upper end portions of the locking grooves 567 and 568 constitute locking surfaces for locking the locking claws 590 and 591 of the side wall portions 581 and 582.
The guide wall portions 536 and 537 are parts that guide the movement direction of the operation member 512 in the vertical direction, and are wall portions projecting upward from the top wall portion 532.
The position fixing portion 538 is a part that fixes a distance and a position between discharge port 8 and the eyeball 101 of the user.
The fixing point for striking 540 is a part that holds a connection portion 572 of the striking member 511.
The fitting portions 541 (541a, 541b) are parts that are fitted to each other and fix the case portions 520 and 521.
In the case portions 520 and 521, the fitting portion 541a of one case portion 520 is a recessed portion as illustrated in
As illustrated in
The striking portion 570 includes the flat portion 58, the projecting portion 59 projecting with respect to the flat portion 58, and an engagement portion 575.
The engagement portion 575 is a part that engages with a locking surface 597 of the operation member 512 in a state with no load on the operation member 512.
The elastic portion 571 is an elastically deformable member, specifically, a leaf spring.
The elastic portion 571 is supported in a cantilever manner by the case member 510 via the connection portion 572, and extends from the connection portion 572 toward the same direction (forward direction) as the striking portion 570.
The connection portion 572 is a part that is fixed to the fixing point for striking 540 and is connected to the case member 510, and is also a part that connects the proximal end portion of the striking portion 570 and the proximal end portion of the elastic portion 571.
As illustrated in
The operation surface portion 580 is a part pressed to be operated by the user, and is a plate-shaped part constituting the top surface of the dosing device 500.
As illustrated in
The main body portion 587 is a plate-shaped part extending in the front-rear direction, and includes the locking claws 590 and 591, which lock separation of the operation member 512 from the case member 510, at a lower end portion or in the vicinity of the lower end portion.
The leg portions 588 and 589 are projecting portions that project downward from the lower end portion of the main body portion 587.
As illustrated in
The closing portion 583 has a plate-shaped body extending downward from the operation surface portion 580, and includes an operation-side through-hole 592 penetrating in the thickness direction.
The operation-side through-hole 592 is an open hole that opens the discharge port 8 of the liquid medicine cartridge 502 in a case where the operation member 512 is operated.
The operation-side pressing portion 585 is a projection portion extending downward from the operation surface portion 580, and is a part that presses the elastic portion 571 of the striking member 511 at an end portion in the extension direction.
As illustrated in
The main body plate portion 595 is a projection portion extending downward from the operation surface portion 580, and is a part that presses the guide portions 561 of the case portion 521 at an end portion in the extension direction.
The locking portion 596 is a part that is provided at an intermediate portion of the main body plate portion 595 in the extension direction, engages with the engagement portion 575 of the striking portion 570 of the striking member 511, and locks the upward movement of the striking member 511.
The locking portion 596 is a projecting portion that projects in a direction intersecting the extension direction of the main body plate portion 595, and includes the locking surface 597, and an inclined surface 598.
The locking surface 597 is a surface that faces downward and abuts on and locks the engagement portion 575 of the striking portion 570, and is a vertical surface standing perpendicularly to the inner surface of the main body plate portion 595.
The inclined surface 598 is a surface inclined at an acute angle with respect to the inner surface of the main body plate portion 595.
As illustrated in
The liquid medicine storage portion 601 is a rectangular parallelepiped member that has the storage space 65 therein and extends in an insertion direction of the liquid medicine cartridge 502.
The liquid medicine storage portion 601 includes a cutout portion 602 from the distal end portion side of the insertion direction toward the base end portion side, and the tube member 6 is disposed in the cutout portion 602.
The struck portion 62 is provided on the inner surface of the cutout portion 602, and the flat portion 68 and the recessed portion 69 are formed.
As illustrated in
Next, the positional relationships of respective members of the dosing device 500 in a state where the operation member 512 is not operated, that is, in a no-load state will be described.
As illustrated in
As illustrated in
The fitting portion 541b of the case portion 521 is inserted and fitted into the fitting portion 541a of the case portion 520.
As illustrated in
As illustrated in
The closing portion 583 of the operation member 512 is inserted into the case-side restriction groove 551 of the case member 510, and closes the liquid medicine passage hole 550. That is, the dosing device 500 is in a closed state in which the liquid medicine passage hole 550 is closed by the closing portion 583.
The liquid medicine cartridge 502 is attached to the attachment portion 555, and the ridge portion 603 is inserted into the restriction groove 556 of the case member 510.
Subsequently, a dosing method at the time of administration to a user using the dosing device 500 will be described.
First, as can be seen from
In this case, the liquid medicine cartridge 502 is moved linearly along the restriction groove 556 of the attachment portion 555, and the tube member 6 is disposed to face the striking portion 570.
In this case, since the dosing device 500 is in the closed state as illustrated in
Subsequently, as illustrated in
In a case where the operation surface portion 580 of the operation member 512 is pressed to be operated, and the elastic portion 571 and the striking portion 570 further rotate in a state where the distal end surface of the main body plate portion 595 is in contact with the guide portions 561 of the case member 510 as illustrated in
In this case, the operation-side through-hole 592 is linearly aligned with the liquid medicine passage hole 550, the liquid medicine passage hole 550 is opened, and the open posture illustrated in
In a case where the engagement between the locking surface 597 of the locking portion 596 and the engagement portion 575 of the striking portion 570 is released, as illustrated in
Then, the liquid medicine 100 in the tube member 6 is linearly discharged from the discharge port 8 by the striking force, passes through the liquid medicine passage hole 550 and the operation-side through-hole 592, and reaches the eyeball 101 of the user.
In this case, a centrifugal force about the connection portion 572 acts on the striking portion 570, and the striking portion 570 strikes the elastic region of the tube member 6 by inertia exceeding the height of the connection portion 572.
As illustrated in
In a case where the user stops the pressing operation on the operation surface portion 580, as illustrated in
With the dosing device 500 of the present embodiment, since the liquid medicine cartridge 502 is attachable to and detachable from the main body portion 501, it is possible to easily replace the liquid medicine in a case where the liquid medicine runs out or in a case where it is desired to drop a different liquid medicine.
With the dosing device 500 of the present embodiment, in a case where the pressing operation is not performed, the dosing device 500 is in the closed state in which the closing portion 583 closes the liquid medicine passage hole 550, and in a case where the pressing operation is performed, the closing portion 583 is moved with the pressing operation to automatically open the liquid medicine passage hole 550. That is, in a case where the pressing operation is not performed, since the discharge port 8 of the tube member 6 is always protected by the closing portion 583, the discharge port 8 is not exposed to the outside except in a case where the liquid medicine cartridge 502 is replaced or in a case where eye drops are applied, and the discharge port 8 is less likely to be contaminated.
With the dosing device 500 of the present embodiment, the striking portion 570 is elastically deformed by the pressing operation, and the restoring force causes the striking portion 570 to strike at least a part of the elastic region at a position higher than the connection portion 572 with an impact force. That is, like a pendulum, since the striking portion 570 strikes the tube member 6 by the restoring force and the inertial force of the striking portion 570, it is not necessary to further provide a energizing member for striking with an impact force, and the cost can be reduced.
Subsequently, a dosing device 700 of a third embodiment of the present invention will be described.
As illustrated in
Similarly to the dosing device 500 of the second embodiment, in the dosing device 700, the discharge ports 8 and 8 of the liquid medicine cartridges 502a and 502b are blocked by the closing portion 583 in the closed state, the state is changed to the open state by the pressing operation on the operation surface portion 580, the discharge ports 8 and 8 of the liquid medicine cartridges 502a and 502b overlap the operation-side through-hole 592 to be opened, and the liquid medicine of the liquid medicine cartridges 502a and 502b can be simultaneously discharged from the discharge ports 8 and 8.
With the dosing device 700 of the third embodiment, since the plurality of liquid medicine cartridges 502a and 502b can be attached to the main body portion 501, different types of liquid medicines can be administered simultaneously, and the patient can be released from the troublesome multi-drug administration.
With the dosing device 700 of the third embodiment, since the liquid medicine cartridges 502a and 502b can be replaced individually, the liquid medicines in the liquid medicine cartridges 502a and 502b can be used to the end.
In the above-described embodiments, the tube member 6 has a uniform inner diameter from the liquid medicine storage portion 5 to the discharge port 8, but the present invention is not limited thereto. A narrowed portion may be provided in a part of the tube member 6 between the inside of the liquid medicine storage portion 5 and the discharge port 8. For example, an orifice may be provided at an end portion of the struck part of the tube member 6 on the discharge port 8 side. In this way, the discharge distance of the liquid medicine 100 can be improved.
In the above-described embodiment, the recessed portion 69 is provided in the struck portion 62, and the projecting portion 59 is provided in the striking portion 51, but the present invention is not limited thereto. As illustrated in
In addition, the projecting portion 59 and the recessed portion 69 may not be provided in the struck portion 62 and the striking portion 51. That is, the struck portion 62 and the striking portion 51 may be formed only of the flat portion 68 and the flat portion 58.
In the embodiments described above, the cross-sectional shape of the tube member 6 is a circular shape, but the present invention is not limited thereto. The cross-sectional shape of the tube member 6 may be a polygonal shape such as a triangle, a quadrangle, a pentagon, or a hexagon, or may be a flat shape, an elliptical shape, or an oval shape.
In the embodiments described above, the tube member 6 has a uniform wall thickness, but the present invention is not limited thereto. There may be a partially thin portion. For example, the struck part of the tube member 6 may be thicker than other portions.
In the embodiments described above, the entire tube member 6 is formed of an elastic material, so that the entire region of the tube member 6 is an elastic region, but the present invention is not limited thereto. At least a part of the tube member 6 in the longitudinal direction, for example, only the region where the tube member 6 is struck by the striking portion 51 or only the vicinity of the region where the tube member 6 is struck by the striking portion 51 may be the elastic region.
In the embodiments described above, the tube member 6 is formed of one elastic material, but the present invention is not limited thereto. As illustrated in
In the embodiments described above, the striking member 3 changes its posture against the energizing force from the energizing member 7 to cause the striking by the striking portion 51 using the reaction force, but the present invention is not limited thereto. The striking member 3 may be moved against the energizing force from the energizing member 7 to cause the striking by the striking portion 51 using the reaction force.
In the embodiments described above, the case where the dosing devices 1, 500, and 700 are used for eye drops has been described, but the present invention is not limited thereto. The dosing devices 1, 500, and 700 may be used for nasal, ear, oral, or transdermal administration.
In the embodiments described above, the storage space 65 of the liquid medicine storage portion 5 extends in the horizontal direction in a posture in which the discharge port 8 of the dosing device 1 faces the horizontal direction, but the present invention is not limited thereto. For example, as illustrated in
In the first embodiment described above, the liquid medicine unit 4 is not attachable to and detachable from the case member 2, but the present invention is not limited thereto. The liquid medicine unit 4 may be attachable to and detachable from the case member 2. In this way, the used liquid medicine unit 4 can be replaced with a new liquid medicine unit 4 as in the cartridge system. Therefore, other members other than the liquid medicine unit 4 can be reused.
The dosing device 1 according to the embodiment described above may be provided with a protective cover for protecting the discharge port 8 and the tube member 6 as necessary.
The dosing device 1 according to the first embodiment described above may be provided with a fixing jig or the like for fixing the distance or position between the discharge port 8 and the eyeball 101 as necessary.
In the embodiments described above, the tube member 6 is struck by changing the posture of the striking portions 51 and 570, but the present invention is not limited thereto. The striking portions 51 and 570 may be moved relative to the tube member 6 to strike the tube member 6.
In the second embodiment described above, the closed state in which the closing portion 583 closes the liquid medicine passage hole 550 and the open state in which the closing portion 583 is moved relative to the case member 510 to open the liquid medicine passage hole 550 are changed by operating the operation member 512, but the present invention is not limited thereto. The closed state may be changed to the open state by changing the posture of the closing portion 583 with respect to the case member 510 by operating the operation member 512.
In the embodiments described above, the case where the liquid discharge device is used as the dosing device has been described, but the present invention is not limited thereto. The liquid discharge device of the present invention can be used in other applications. For example, it can also be used as a liquid dispensing pipette, an adhesive applicator, a dropper for aromatic oil, perfume, or the like, an oil filling device for precision parts, an animal medicine administration device, or an insecticide discharge device.
In the embodiments described above, each component can be freely replaced or added between the embodiments as long as it is included in the technical scope of the present invention.
Hereinafter, the present invention will be specifically described with reference to examples. Note that the present invention is not limited to the following examples, and can be appropriately modified without changing the gist thereof.
In the dosing device according to the first embodiment described above, a silicone tube having an inner diameter of 0.5 mm and an outer diameter of 0.6 mm was used as the tube member, and the length of the striking part of the striking portion (the length D of the pressed portion of the tube member) was set to 6 mm. In addition, medium-chain fatty acid triglyceride (specific gravity: 0.953 g/cm3) was used as the liquid medicine. This was designated as Example 1.
The same procedure as in Example 1 was carried out except that an orifice having an orifice diameter of 0.15 mm was provided at the discharge port of the tube member, and this procedure was designated as Example 2.
(Discharge amount test)
The liquid medicine is transferred from the liquid medicine reservoir to the tube member by capillarity, and the influence of the discharge interval (administration interval: 1 second, 5 seconds, 10 seconds, 20 seconds) on the discharge amount was examined.
In this case, a medium-chain fatty acid triglyceride was used as the liquid medicine, the discharge amount was measured as a weight using a semi-microbalance, and then the discharge amount (μL) was calculated from the specific gravity of the liquid medicine (test temperature was room temperature). Specifically, the sample was discharged 10 times, and the total weight (mg) of the sample was measured to calculate the single discharge amount (μL).
The results are listed in Table 1.
As listed in Table 1, the discharge amount of Example 1 was 1/80 or less as compared with the discharge amount from a normal eye drop bottle (about 40 μL to 50 μL), and was a sufficiently small amount. In Example 2 with the orifice, since discharge resistance is generated by the orifice, the discharge amount was smaller than that in Example 1 without the orifice.
As listed in Table 1, in each of Examples 1 and 2, the standard deviation of the single discharge amount (one droplet amount) was 0.05 or less even in the case where the sample was repeatedly discharged, that is, the accuracy was high. In Examples 1 and 2, when we changed the discharge interval, with repeatedly discharging, such as 1 second, 5 seconds, 10 seconds, and 20 seconds, the discharge amount tended to slightly increase, but the discharge amount was not at a level that causes a problem.
As described above, it was found that a small amount of the liquid medicine can be quantitatively administered with high accuracy. In addition, it was found that a small amount of the liquid medicine can be linearly discharged from the trajectory of the liquid medicine.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/JP2021/000021 | Jan 2021 | US |
| Child | 18343024 | US |
