Medicine solution administration device

Abstract

To provide a medicine solution administration device for administering medicine solution filled in a medicine solution container which is capable of administering medicine solution with high accuracy.SOLUTION: A medicine solution administration device 1 has: a drive mechanism 30 that advances a presser 11 pressing medicine solution 2 out of a medicine solution container 10 filled with the medicine solution 2 to an end opening 12 of the medicine solution container 10; and a housing 50 capable of housing the medicine solution container 10 and the drive mechanism 30. The drive mechanism 30 has: a motor 31 for imparting to the presser 11 a driving force to advance the presser 11; and an optical rotation detection part 32 optically detecting rotation of the motor 31. The optical rotation detection part 32 has: a light emitting part 33 for emitting detection light; and a light receiving part 34 for receiving the detection light. There are provided light quantity reduction parts (70, 71, 72) for reducing an input light quantity of light other than the detection light to the light receiving part 34.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a drug solution administration device capable of administering a drug solution with high accuracy. [Background technology]

[0002] 2. Description of the Related Art Conventionally, so-called syringe pump type drug solution administration devices for administering a drug solution filled in a drug solution container have been known. As an example of such a drug solution administration device, Patent Document 1 (JP 2018-507747 A) discloses a drug delivery pump (drug solution administration device) having a structure in which the speed of movement of a piston (110, 1110, 2110) (plunger seal (60) in a barrel (58)) is controlled by a drive mechanism (100) equipped with an electric actuator (101) consisting of a motor or the like, to push out a fluid (drug solution) from a drug chamber (21) defined in a drug container (50). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Table 2018-507747 Summary of the Invention [Problem to be solved by the invention]

[0004] In a medicinal solution administration device, the accuracy of medicinal solution administration is ensured by detecting the operation of the drive mechanism (such as the rotation of the motor). An optical rotation detection unit that optically detects the rotation of the motor is used as the rotation detection unit that detects the rotation of the motor. Optical rotation detection units have the advantage over contact-type rotation detection units in that they do not impede the rotation of the motor (do not provide resistance to the rotation of the motor). On the other hand, when an optical rotation detection unit is used, there are cases where the rotation speed of the motor is determined to be abnormal even though there is no abnormality in the rotation of the motor, which can reduce the accuracy of medicinal solution administration or, in some cases, activate a safety device and interrupt the administration of medicinal solution. In response to this problem, the inventors have come to the realization that light other than the detection light may be having an adverse effect. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a liquid medicine administration device for administering a liquid medicine filled in a liquid medicine container, which is capable of administering the liquid medicine with high accuracy. [Means for solving the problem]

[0005] The above objectives are achieved by the following: (1) A drug solution administration device having a drive mechanism that advances a pusher that pushes out a drug solution from a drug solution container filled with the drug solution toward a tip opening of the drug solution container, and a housing that can accommodate the drug solution container and the drive mechanism, the drive mechanism includes a motor that applies a drive force to the plunger to move the plunger forward, and an optical rotation detection unit that optically detects rotation of the motor, the optical rotation detector includes a light emitter that emits detection light and a light receiver that receives the detection light, The medicinal liquid administration device includes a light amount reduction unit that reduces the amount of light other than the detection light that enters the light receiving unit.

[0006] (2) The drug solution administration device is used by being attached to a living body part, the housing has a lower surface portion that is attached to the living body part, an upper surface portion that faces the lower surface portion with the optical rotation detection unit therebetween, and a pair of side surfaces that connect both side surfaces of the lower surface portion and the upper surface portion to each other; The medicinal solution administration device according to (1) above, wherein the light amount reducing section is provided at least on the upper surface of the housing. (3) The medicinal solution administration device according to (2), wherein the light reduction section is provided on the top surface and the side surface of the housing. (4) The optical rotation detector is disposed in a base end portion of the housing, The drug solution administration device according to any one of (1) to (3) above, wherein the light amount reducing section has a base end side light amount reducing section provided on the base end side of the optical rotation detecting section. (5) A drug solution administration device described in any of (1) to (4) above, wherein the optical rotation detection unit is a transmissive photointerrupter in which the light-emitting unit and the light-receiving unit are arranged opposite each other across the detected part, or a reflective photointerrupter in which the light-emitting unit and the light-receiving unit are arranged on the same side of the detected part. (6) The housing is formed of a light-transmitting material that allows visible light to pass therethrough, A drug solution administration device described in any of (1) to (5) above, wherein the light receiving unit is capable of receiving light with a wavelength of 700 to 1000 nm, and the light amount reduction unit has a lower transmittance of light with a wavelength of 700 to 1000 nm than the housing. (7) The housing is formed of a light-transmitting material that allows visible light to pass therethrough, The medicinal liquid administration device according to any one of (1) to (6) above, wherein the light reduction unit is constituted by a light reduction member separate from the housing. (8) The drug solution administration device according to (7), wherein the light amount reducing member is made of an insulating material and is disposed inside the housing. (9) The drug solution administration device according to any one of (1) to (8), wherein the light amount reduction section has a total light transmittance of 30% or less. (10) The housing is formed of a light-transmitting material that can transmit visible light, The drug solution administration device according to any one of (1) to (9) above, wherein the light amount reducing section includes a near-infrared absorbing material and constitutes a part of the housing. (11) The drug solution administration device according to any one of (1) to (10) above, wherein the light amount reducing section has a light absorbing section or a non-reflective section on the side of the optical rotation detecting section. (12) The medicinal liquid administration device according to any one of (1) to (11) above, wherein the medicinal liquid administration device includes the medicinal liquid container attached to the medicinal liquid administration device. The above objectives are also achieved by the following: (13) A drug solution administration device having a drive mechanism that advances a pusher that pushes out a drug solution from a drug solution container filled with the drug solution toward a tip opening of the drug solution container, and a housing that can accommodate the drug solution container and the drive mechanism, the drive mechanism includes a motor that applies a drive force to the plunger to move the plunger forward, and an optical rotation detection unit that optically detects rotation of the motor, the optical rotation detector includes a light emitter that emits detection light and a light receiver that receives the detection light, the drug solution administration device includes a chassis that is accommodated inside the housing, is fixable to the housing, and is capable of holding or accommodating the optical rotation detection unit; the housing is formed of a light-transmitting material that allows visible light to pass therethrough; the chassis is made of a light-impermeable material through which visible light is hardly transmitted, and has holes formed therein; the drug solution administration device includes a light amount reduction unit that reduces the amount of light other than the detection light entering the light receiving unit, the light amount reduction unit being separate from the housing and the chassis and being configured by a light-shielding member made of a light-resistant hard resin material that is difficult for visible light to transmit through; The light-blocking member reduces the amount of light entering the light-receiving unit through the hole formed in the chassis. [Effects of the Invention]

[0007] The drug solution administration device of the present invention is a drug solution administration device having a drive mechanism that advances a plunger that pushes the drug solution out of a drug solution container filled with the drug solution toward the tip opening of the drug solution container, and a housing that can accommodate the drug solution container and the drive mechanism, wherein the drive mechanism has a motor that provides a drive force to advance the plunger, and an optical rotation detection unit that optically detects the rotation of the motor, and the optical rotation detection unit has an emitter that emits detection light and a light receiver that receives the detection light, and is equipped with a light amount reduction unit that reduces the amount of light other than the detection light that enters the light receiver. This reduces the possibility of the optical rotation detection unit malfunctioning, i.e., determining that the rotation speed is abnormal even though there is no abnormality in the motor rotation, resulting in a decrease in the accuracy of medicinal solution administration, or in some cases, the activation of a safety device that interrupts the administration of medicinal solution. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the basic configuration of an embodiment of a drug solution administration device according to the present invention. [Figure 2] FIG. 2 is a front view of FIG. [Figure 3] FIG. 3 is a plan view of FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is a plan view showing the layout of some of the components in FIG. 3 by dashed lines. [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line BB in FIG. [Figure 7] FIG. 7 is an enlarged schematic front view for explaining the configuration of an optical rotation detection unit used in an embodiment of the drug solution administration device of the present invention. [Figure 8] FIG. 8 is a right side view of FIG. [Figure 9] FIG. 9 is an explanatory diagram showing a state in which the motor has rotated from the state shown in FIG. [Figure 10] FIG. 10 is a front view showing the arrangement of some of the components in FIG. 2 by dashed lines. [Figure 11] FIG. 11 is a right side view of FIG. 2, illustrating the second housing member excluding the same. [Figure 12] FIG. 12 is a plan view showing an embodiment of the drug solution administration device of the present invention. [Figure 13] FIG. 13 is a front view of FIG. [Figure 14] 14 is a right side view showing a state in which a first light amount reduction member is attached to a first housing member of the drug solution administration device shown in FIG. 12. FIG. [Figure 15]FIG. 15 is a right side view of FIG. 12, illustrating the second housing member being omitted. [Figure 16] FIG. 16 is a schematic front view showing the state in which the drug solution administration device and administration implement of the present invention are attached to a living body site. [Figure 17] FIG. 17 is an enlarged schematic front view for explaining the configuration of an optical rotation detection unit used in another embodiment of the drug solution administration device of the present invention. [Figure 18] FIG. 18 is a right side view of FIG. [Figure 19] FIG. 19 is a front view showing another embodiment of the drug solution administration device of the present invention. [Figure 20] 20 is a right side view showing a state in which a first light amount reduction member is attached to a first housing member of the drug solution administration device shown in FIG. 19. FIG. [Figure 21] FIG. 21 is a right side view showing another embodiment of the drug solution administration device of the present invention, and is an explanatory view showing the drug solution administration device without the second housing member. [Figure 22] FIG. 22 is a schematic cross-sectional view taken along the line CC in FIG. [Figure 23] FIG. 23 is an explanatory diagram showing the drug solution administration device shown in FIG. 21 without the light-shielding member. DETAILED DESCRIPTION OF THE INVENTION

[0009] The liquid medicine administration device of the present invention will be described with reference to the embodiment shown in the drawings. 1 to 15 , the drug solution administration device 1 of the present invention includes a drive mechanism 30 that advances a plunger 11 that pushes the drug solution 2 from a drug solution container 10 filled with the drug solution 2 toward a distal end opening 12 of the drug solution container 10, and a housing 50 that can accommodate the drug solution container 10 and the drive mechanism 30. The drive mechanism 30 includes a motor 31 that applies a driving force to the plunger 11 to advance the plunger 11, and an optical rotation detector 32 that optically detects the rotation of the motor 31. The optical rotation detector 32 includes a light emitter 33 that emits detection light and a light receiver 34 that receives the detection light. The optical rotation detector 32 is equipped with light intensity reducers (top-side light intensity reducer 70, side-side light intensity reducer 71, and base-side light intensity reducer 72, which will be described later) that reduce the amount of light other than the detection light entering the light receiver 34. The drug solution administration device 1 of this embodiment includes a drug solution container 10 attached to the drug solution administration device 1.

[0010] Although illustrations and detailed description are omitted, the medicinal liquid administration device 1 of this embodiment, like the medicinal liquid administration device proposed by the present applicant in WO2020 / 202922, includes a detection unit that detects the detection target portion of the plunger 11 and detects completion of delivery of the medicinal liquid based on the detection result, a control unit that controls the operation of the medicinal liquid administration device 1 including the drive mechanism 30, and a power supply unit that supplies the power necessary for operation of the drive mechanism 30, the control unit, etc. The control unit can be configured, for example, by a known microcomputer (electronic circuit elements) equipped with a CPU, RAM, ROM, etc., and comprehensively controls the operation of the medicinal liquid administration device 1 including the drive mechanism 30, the detection unit, the power supply unit, and the optical rotation detection unit 32 described below.

[0011] 1 to 6, housing 50 of the present embodiment includes first housing member (front case) 51 and second housing member (rear case) 52, and defines an internal storage space 53. Housing space 53 of housing 50 accommodates chassis 54 that can be fixed to housing 50 and can hold liquid medicine container 10, plunger 11, drive mechanism 30 (and further, a detection unit, a control unit, a power supply unit), etc.

[0012] In this embodiment, chassis 54 is formed from a hard resin material and includes a substantially plate-shaped substrate portion 55 forming the lower portion (bottom portion), and a base end wall portion 56 extending upward from the base end portion of substrate portion 55. Chassis 54 is provided with shapes for holding drug solution container 10, plunger 11, drive mechanism 30, etc., and further, holes for molding such shapes (by injection molding, etc.) are unavoidably formed. In this embodiment, chassis 54 is formed from a light-transmitting material to improve visibility inside housing 50, but it may also be formed from a light-semitransmitting material, a light-nontransmitting material, or a light-difficult-to-transmit material.

[0013] A base end opening 57 for inserting chassis 54 into accommodation space 53 of housing 50 is formed on the base end side in the longitudinal direction of first housing member 51 of housing 50. Base end opening 57 of first housing member 51 is closed by second housing member 52 in a state in which chassis 54 is accommodated in accommodation space 53. In this embodiment, housing 50 (first housing member 51 and second housing member 52) is formed from a light-transmitting material that is capable of transmitting visible light, making it possible to visually check the inside of housing 50 (particularly the state of drug solution container 10 held by chassis 54 and accommodated in housing 50) from the outside.

[0014] As will be described later (see FIG. 16 ), the drug solution administration device 1 of this embodiment is used by being attached to a living body part 90, and the housing 50 has a lower surface part (living body attachment side part) 58 that is attached to the living body part 90, an upper surface part 59 that faces the lower surface part 58 with the optical rotation detection unit 32 in between, and a pair of side surfaces 60, 60 that connect both sides of the lower surface part 58 and the upper surface part 59. Note that the lower surface part 58 and the upper surface part 59 are connected to the side surfaces 60, 60 smoothly (without edges) in order to reduce stress on the living body (patient) to which the drug solution administration device 1 is attached and to prevent damage to the drug solution administration device 1, and therefore the boundaries between them are not necessarily clear. The contact surface (lower surface 58) of the housing 50 of the drug solution administration device 1 with the biological part 90 is provided with a sheet-like adhesive part (not shown) that can be attached to the surface of the biological part 90, and in the initial state before the drug solution administration device 1 is attached to the user (patient), a peelable protective sheet is attached to the adhesive surface of the adhesive part.

[0015] The liquid medicine container 10 of this embodiment is a so-called prefilled type liquid medicine container, and as shown in Fig. 4, includes a cylindrical (barrel-shaped) main body 13 to be filled with the liquid medicine, and the liquid medicine is pre-filled in a lumen 14 of the main body 13 of the liquid medicine container 10. The tip of the liquid medicine container 10 is provided with a tip opening 12 for discharging the liquid medicine 2 (administering it to a patient). The main body 13 of the liquid medicine container 10 is preferably made of a light-transmitting material. This allows the interior of the liquid medicine container 10 (the administration state of the liquid medicine 2) to be visually observed from the outside.

[0016] Various types of medicinal liquids can be used as the medicinal liquid 2 (liquid medicine) filled in the medicinal liquid container 10, including, for example, protein preparations, narcotic analgesics, diuretics, insulin, analgesics, anti-cancer treatment drugs, local anesthetics, HIV drugs, iron chelating drugs, pulmonary hypertension treatment drugs, vitamins, and medicinal liquids containing antibiotics.

[0017] When not in use, a sealing member 15 is disposed at a tip opening (discharge port) 12 formed at the tip of the liquid medicine container 10 to prevent leakage of the liquid medicine 2. As shown in Fig. 4, the tip opening 12 of the liquid medicine container 10 is disposed so as to protrude to the outside from the housing 50 (first housing member 51). In addition, the tip of the liquid medicine container 10 protruding from the housing 50 (first housing member 51) is provided with a connector portion (liquid medicine container-side connector portion) 16 that can be connected to a tube 101 (see Fig. 16) connected to an administration instrument 100, which will be described later.

[0018] A plunger 11 having a generally cylindrical shape is inserted into the lumen 14 of the main body 13 of the liquid medicine container 10 from the base end side (see FIG. 4 ). A gasket 18 that can slide along the inner wall of the liquid medicine container 10 is attached to the tip of the plunger 11. The gasket 18 can be made of a flexible resin material such as rubber or elastomer. The outer periphery of the gasket 18 is in liquid-tight contact with the inner circumferential surface of the main body 13 of the liquid medicine container 10, thereby liquid-tightly sealing the base end side of the lumen 14 filled with the liquid medicine 2. In this embodiment, the shape of the tip of the gasket 18 is formed to be generally the same as the shape inside the tip of the liquid medicine container 10.

[0019] The drive mechanism 30 has a motor 31, a reduction mechanism (power transmission mechanism) equipped with gears (here, motor side gear 35, intermediate gear 36, and drug solution container side gear 37) that transmit the driving force of the motor 31, an optical rotation detection unit 32 that detects the rotation of the motor 31 and is provided adjacent to the reduction mechanism, and a feed screw 38 connected to the reduction mechanism (here, drug solution container side gear 37).

[0020] The feed screw 38 is disposed on the chassis 54 so as to be rotatable but immovable in the axial direction of the liquid medicine container 10. The feed screw 38 has a male thread portion provided on its outer circumferential surface, which is connected (screwed) to a base end connecting portion (female thread portion) 19 disposed near the base end of the plunger 11. The plunger 11 is immovable relative to the feed screw 38 but is movable in the axial direction of the liquid medicine container 10, and rotation of the feed screw 38 causes the plunger 11 to be screwed and move in the axial direction of the liquid medicine container 10. In other words, the feed screw 38 converts the rotational motion transmitted from the motor 31 via a reduction mechanism (motor-side gear 35, intermediate gear 36, liquid medicine container-side gear 37) into linear motion, and moves the plunger 11 forward in the longitudinal direction (the axial direction of the main body (barrel) 13 of the liquid medicine container 10). As the plunger 11 advances toward the tip side of the liquid medicine container 10 , the liquid medicine 2 in the lumen 14 of the main body 13 of the liquid medicine container 10 is pushed out from the tip opening 12 .

[0021] The optical rotation detector is preferably a transmissive photointerrupter in which the light-emitting element and the light-receiving element are disposed opposite each other across the detected element (in this embodiment, the blade 40, described later), or a reflective photointerrupter in which the light-emitting element and the light-receiving element are disposed on the same side of the detected element. As shown in FIGS. 6 and 7, in this embodiment, the optical rotation detector 32 is a transmissive photointerrupter in which the light-emitting element 33 and the light-receiving element 34 are disposed opposite each other. As shown in FIGS. 5 and 10, the optical rotation detector 32 is disposed in the proximal end portion of the housing 50. FIGS. 17 and 18 show an example in which a reflective photointerrupter is used as the optical rotation detector 32a. In the optical rotation detector 32a, the light-emitting element 33 and the light-receiving element 34 are disposed on the same side (the right side in FIG. 17) of the detected element (the blade 40).

[0022] The light receiving unit 34 of the optical rotation detector 32 of this embodiment is preferably capable of receiving light with a wavelength of 700 to 1000 nm (so-called near-infrared light). In other words, the optical rotation detector 32 preferably uses light with a wavelength of 700 to 1000 nm as detection light. Optical rotation detectors 32 equipped with such a light receiving unit 34 are common, relatively inexpensive, and rarely malfunction.

[0023] Here, the detection of rotation of the motor 31 by the optical rotation detector 32 in this embodiment will be specifically described. As shown in FIGS. 7 to 9 , a motor-side gear 35 is connected to the base end of the rotation shaft of the motor 31. The motor-side gear 35 rotates in conjunction with the rotation of the motor 31. The motor-side gear 35 has a motor-side gear portion 39 at its tip end that meshes with an intermediate gear 36, and three blades 40 formed at its base end. The blades 40, 40, 40 each have the same shape (a fan-shaped plate shape) and are provided at equal intervals in the circumferential direction. Each blade 40 is positioned so as to pass between the light-emitting portion 33 and the light-receiving portion 34. When each blade 40 (detection target portion) is located between the light-emitting portion 33 and the light-receiving portion 34, the detection light emitted from the light-emitting portion 33 is blocked by the blade 40, and is not detected by the light-receiving portion 34 (or the amount of light received is reduced). The optical rotation detector 32 detects the rotation of the motor 31 by detecting whether or not the detection light emitted from the light emitter 33 is received by the light receiver 34 (or the difference in the amount of received light).

[0024] The optical rotation detection unit 32 is electrically connected to the control unit, and if it determines that there is an abnormality in the rotation of the motor 31 (abnormal rotation speed), it can issue a warning or activate a safety device to interrupt the administration of the medicinal solution.

[0025] That is, when motor 31 is rotated, the speed reduction mechanism is driven to rotate feed screw 38, and plunger 11 advances within medicinal solution container 10. Then, optical rotation detector 32 provided adjacent to the speed reduction mechanism (motor-side gear 35 in this case) detects the rotation of motor 31, and the control unit calculates the rotation speed of motor 31 and determines whether motor 31 is rotating or not, thereby determining whether medicinal solution is being administered normally.

[0026] In this embodiment, as shown in FIG. 11, an LED (alert lamp) 61 is disposed at the base end of the chassis 54, and the operating state of the medicinal solution administration device 1 (the rotation state of the motor 31) can be visually confirmed from the outside based on the light emission state of the LED 61. For example, when the motor 31 is operating normally, the LED 61 can be made not to emit light or can be made to emit a predetermined color (e.g., green) to notify the user that the rotation of the motor 31 (administration of the medicinal solution 2) is normal. On the other hand, when an abnormality is detected in the rotation of the motor 31, the LED 61 can be made to emit a predetermined color (e.g., red) to notify the user of the occurrence of the abnormality. Note that it is preferable that the LED 61 does not emit light that can be detected by the light receiving unit 34, for example, light with a wavelength of 700 to 1000 nm.

[0027] The medicinal solution administration device 1 is provided with light intensity reduction units (top surface side light intensity reduction unit 70, side surface side light intensity reduction unit 71, and base end side light intensity reduction unit 72, which will be described later) that reduce the amount of light other than detection light that enters the light receiving unit 34 of the optical rotation detection unit 32. This reduces the possibility of the optical rotation detection unit 32 malfunctioning, that is, determining that there is an abnormality in the number of rotations of the motor 31 even though there is no abnormality in the rotation, thereby reducing the accuracy of medicinal solution administration or, in some cases, activating a safety device to interrupt the administration of medicinal solution.

[0028] The light amount reducing portion is preferably provided at least on the top surface 59 of the housing 50. In this embodiment, as shown by crosshatching in FIGS. 12 and 13 , the light amount reducing portion is provided on the top surface 59 and side surface 60 of the housing 50 (top surface light amount reducing portion 70 and side surface light amount reducing portion 71). When the drug solution administration device 1 of this embodiment is attached to a living body site 90 and used, the penetration (incoming light) of light (sunlight, etc.) other than the detection light from the bottom surface 58 (the living body site side) is relatively small. Therefore, by providing the light amount reducing portions (top surface light amount reducing portion 70 and side surface light amount reducing portion 71) on the top surface 59 and side surface 60 of the housing 50, the amount of light other than the detection light entering the light receiving unit 34 of the optical rotation detection unit 32 can be efficiently reduced, thereby reducing the possibility of malfunction of the optical rotation detection unit 32.

[0029] 12 and 13 , the light intensity reducing portions (top surface-side light intensity reducing portion 70 and side surface-side light intensity reducing portion 71) are preferably provided so as to cover the optical rotation detecting portion 32 in the axial direction of the liquid medicine container 10 (the left-right direction in FIG. 12 ), in other words, so as to extend distally and proximally beyond the optical rotation detecting portion 32. In order to ensure visibility inside the housing 50 of the liquid medicine administration device 1 (particularly the liquid medicine container 10), the distal end of the light intensity reducing portion (particularly the top surface-side light intensity reducing portion 70) is preferably located proximally beyond the proximal end of the gasket 18 housed in the lumen 14 of the liquid medicine container 10, and more preferably located proximally beyond the proximal end of the main body 13 of the liquid medicine container 10.

[0030] Furthermore, in this embodiment, the light intensity reducing unit has a base-side light intensity reducing unit 72 provided on the base-end side of the optical rotation detection unit 32. Specifically, as shown by crosshatching in FIGS. 13 and 15 , the base-side light intensity reducing unit 72 is provided on the base-end surface of the base-end wall portion 56 of the chassis 54. In this embodiment, the base-side light intensity reducing unit 72 has side light intensity reducing units 72a, 72a extending (forward) to the side surface portion 60 of the housing 50 so as to cover both sides of the optical rotation detection unit 32. Note that, as in the medicinal solution administration device 1a (first light intensity reducing member 73a) shown in FIGS. 19 and 20 , all or part of the side-side light intensity reducing unit 71a (here, a part on the base-end side) may be extended downward to provide side light intensity reducing units 71b, 71b covering both sides of the optical rotation detection unit 32.

[0031] In the drug solution administration device 1 of this embodiment, the chassis 54 is made of a light-transmitting material, and holes are formed in the chassis 54 (proximal end wall portion 56) to hold certain components or as a result of unavoidable molding processes, and there is a risk that light other than the detection light may enter by passing through the chassis 54 or through the holes formed in the chassis 54. Therefore, by providing a proximal end light amount reduction portion 72 (particularly, a proximal end light amount reduction portion 72 that covers the entire surface of the proximal end wall portion 56 and is provided so as to block the holes formed in the proximal end wall portion 56), the amount of light other than the detection light that enters the light-receiving portion 34 of the optical rotation detection unit 32 can be effectively reduced, and the possibility of malfunction of the optical rotation detection unit 32 can be reduced.

[0032] Furthermore, in the medicinal solution administration device 1 of this embodiment, an LED (alarm lamp) 61 is disposed at the base end portion of the chassis 54 for visually confirming the operating state of the medicinal solution administration device 1. For example, if the LED 61 emits light of a wavelength that can be detected by the light receiving unit 34 (in other words, light that affects the detection accuracy), by providing a base end side light amount reduction unit 72 (particularly, a base end side light amount reduction unit 72 that is arranged to block the light of the LED 61) in the medicinal solution administration device 1, the amount of light other than the detection light (light from the LED 61) that enters the light receiving unit 34 of the optical rotation detection unit 32 can be effectively reduced, and the possibility of malfunction of the optical rotation detection unit 32 can be reduced.

[0033] In the drug solution administration device 1 of this embodiment, the housing 50 (first housing member 51 and second housing member 52) is formed of a light-transmitting material that allows visible light to pass through, and the light receiving unit 34 of the optical rotation detection unit 32 is capable of receiving light with a wavelength of 700 to 1000 nm. In this case, it is preferable that the light amount reducing units (top-side light amount reducing unit 70, side-side light amount reducing unit 71, and base-side light amount reducing unit 72) have a lower transmittance of light with a wavelength of 700 to 1000 nm than the housing 50 (first housing member 51 and second housing member 52). This reduces the amount of light with a wavelength of 700 to 1000 nm that penetrates the housing 50 (first housing member 51 and second housing member 52) and enters the light receiving unit 34, thereby reducing the possibility of malfunction of the optical rotation detection unit 32.

[0034] The light intensity reducing portions (top surface side light intensity reducing portion 70, side surface side light intensity reducing portion 71, base end side light intensity reducing portion 72) preferably have a total light transmittance of 30% or less. This effectively reduces the amount of light other than detection light (light from LED 61) entering the light receiving portion 34 of the optical rotation detection portion 32 to a necessary and sufficient level, thereby reducing the possibility of malfunction of the optical rotation detection portion 32. Note that the "total light transmittance" referred to here is measured based on JIS K7375:2008 (Plastics - Determination of total luminous transmittance and total luminous reflectance).

[0035] It is preferable that the light intensity reducing portions (top surface side light intensity reducing portion 70, side surface side light intensity reducing portion 71, base end side light intensity reducing portion 72) have a light absorbing portion or a non-reflective portion (black) on the optical rotation detection unit 32 side (surface facing the light receiving unit 34). As a result, even if light other than the detection light enters the optical rotation detection unit 32 side of the light intensity reducing portion, such light is absorbed (reduced) by the portion of the light intensity reducing portion on the optical rotation detection unit 32 side (surface facing the light receiving unit 34). This reduces the amount of light other than the detection light (light from the LED 61) that enters the light receiving unit 34 of the optical rotation detection unit 32, and reduces the possibility of malfunction of the optical rotation detection unit 32. On the other hand, the portions (surfaces facing outward) of the light intensity reducing portions (top surface-side light intensity reducing portion 70, side surface-side light intensity reducing portion 71, base end-side light intensity reducing portion 72) opposite to the optical rotation detection unit 32 side may be light reflecting portions (for example, white portions or mirrored portions). This reflects external light to reduce the amount of light entering the light receiving unit 34 and prevents overheating inside the housing 50.

[0036] In this embodiment, the light amount reducing portions (top surface side light amount reducing portion 70, side surface side light amount reducing portion 71, base end side light amount reducing portion 72) are configured by light amount reducing members (first light amount reducing member 73, second light amount reducing member 74) separate from the housing 50. Specifically, in this embodiment, the top surface side light amount reducing portion 70 and the side surface side light amount reducing portion 71 are configured by the first light amount reducing member 73 disposed inside the housing 50 (first housing member 51), and the base end side light amount reducing portion 72 is configured by the second light amount reducing member 74 disposed inside the housing 50 (second housing member 52).

[0037] Furthermore, such light-intensity reducing members (first light-intensity reducing member 73, second light-intensity reducing member 74) are preferably formed from an insulating material and disposed inside the housing 50. Such light-intensity reducing members may be any known light-intensity reducing member, such as a light-shielding film, a light-shielding sheet, a light-shielding thin plate, or a light-shielding tape. Furthermore, the light-intensity reducing member preferably has an adhesive layer (adhesive portion) for attachment to the housing. Light-shielding adhesive tape is particularly preferred as a light-intensity reducing member. For example, a light-shielding polyester-based adhesive tape (product name "DAITAC (registered trademark) LS-050H-2") manufactured by DIC Corporation may be used as the light-shielding adhesive tape. In this embodiment, the light amount reducing members (first light amount reducing member 73, second light amount reducing member 74) are attached (pasted) to the housing 50 or the chassis 54 via an adhesive layer, thereby forming the light amount reducing sections (top surface side light amount reducing section 70, side surface side light amount reducing section 71, base end side light amount reducing section 72). Note that, as the light amount reducing members, the above-mentioned flexible film, sheet, or tape-like members can be suitably used in view of their attachability to the medicinal solution administration device 1 (housing 50, chassis 54, etc.). However, for example, members formed from a hard resin material molded to fit the shape of the part to which they are attached can also be used.

[0038] Another advantage is that design freedom and the use of standard components are possible by making the light-amount reducing member that constitutes the light-amount reducing unit separate from the housing 50. For example, even if the shape (size) of the drug solution container differs depending on the type of drug solution to be administered, a common housing can be used, and the light-amount reducing unit can be provided using a light-amount reducing member of an appropriate shape for each, taking into consideration the required visibility of the drug solution container and the light-amount reducing ability for the light-receiving unit.

[0039] Furthermore, by disposing the light amount reducing members (first light amount reducing member 73, second light amount reducing member 74) inside the housing 50, it is possible to prevent the medicinal solution administration device 1 from becoming larger in size and the light amount reducing members (first light amount reducing member 73, second light amount reducing member 74) from falling off. Furthermore, various components (medicinal solution container 10, plunger 11, drive mechanism 30, control unit, power supply unit, etc.) are housed inside the housing 50, and by forming the light amount reducing members (first light amount reducing member 73, second light amount reducing member 74) from an insulating material, it is possible to avoid the risk of short circuiting.

[0040] As shown in Figure 16, the drug solution administration device 1 of this embodiment is configured to be connectable to an administration instrument 100. An outline of the administration instrument 100 will now be described. Administration device 100 has a connector portion (administration device side connector portion) 102, a tube 101, a needle tube 103 to be inserted into a living body (living body part 90), and a puncture portion (cannula housing) 104.

[0041] The connector portion 102 is configured to be connectable to the medicinal solution administration device 1. Specifically, the connector portion 102 is connected to the medicinal solution administration device 1 by being fitted onto the outside of a connector portion 16 provided at the tip portion of the medicinal solution container 10 that protrudes outside the housing 50. Although not shown, a connecting needle portion capable of piercing a sealing member 15 arranged at the tip portion of the medicinal solution container 10 is arranged inside the connector portion 102. The tube 101 is communicated with the inner cavity 14 of the main body portion 13 of the medicinal solution container 10 via the connecting needle portion.

[0042] A flow path (not shown) that connects the inner lumens of tube 101 and needle tube 103 is formed inside puncturing part 104. When plunger 11 of medicinal solution administration device 1 advances inside medicinal solution container 10 with needle tube 103 puncturing the living body, medicinal solution 2 filled in medicinal solution container 10 is sent to puncturing part 104 via tube 101 and administered into the living body through the flow path formed inside puncturing part 104 and needle tube 103.

[0043] Like the drug solution administration device 1, the administration device 100 is configured as a patch type that is attached to the body surface 91 of a user. A sheet-like adhesive part (not shown) that can be attached to the body surface 91 is provided on the contact surface (bottom surface) of the puncture part 104 of the administration device 100. In the initial state before the administration device 100 is attached to the user, a peelable protective sheet is attached to the adhesive surface of the adhesive part.

[0044] The drug solution administration device of the present invention is not limited to the above-described embodiment. For example, the housing 50 may be formed of a light-transmitting material that allows visible light to pass through, and the light-amount reducing portion may include a near-infrared absorbing material and constitute a part of the housing 50. In other words, in the drug solution administration device 1, the housing 50 as a whole may be light-transmitting, but the light-amount reducing portion that constitutes a part of the housing 50 may have reduced light transmittance by including a near-infrared absorbing material. This reduces the amount of light other than the detection light entering the light-receiving unit 34 of the optical rotation detection unit 32 at a desired portion of the housing 50 (the portion where the light-amount reducing portion is formed), thereby reducing the possibility of malfunction of the optical rotation detection unit 32. Note that such an embodiment can be realized, for example, by molding the housing 50 by two-color molding using a light-transmitting material and a material containing a near-infrared absorbing material, or by insert-molding the housing 50 with a light-amount reducing portion (light-amount reducing member) formed of a material containing a near-infrared absorbing material.

[0045] Furthermore, although the medicinal liquid administration device 1 of this embodiment is equipped with a medicinal liquid container 10 attached to the medicinal liquid administration device 1 (housed in the housing 50), it is also possible to prepare a medicinal liquid administration device 1 without a medicinal liquid container and the medicinal liquid container 10 separately, and attach a specified medicinal liquid container 10 to the medicinal liquid administration device 1 at the time of use, sale, etc.

[0046] Furthermore, the manner in which the optical rotation detector detects the rotation of the motor is not limited to the above. For example, a disk may be provided at the base end of the motor-side gear, and multiple slits may be provided in the disk. Furthermore, a blade member (a member having blades 40) or a slit member (a member provided with slits) that rotates in conjunction with the rotation of motor 31 may be provided separately from the motor-side gear. Even in such a manner, the rotation of motor 31 can be detected by detecting whether or not detection light passes through as the motor rotates, and detecting the presence or absence of the detection light.

[0047] Furthermore, in the above-described embodiment (medicinal solution administration device 1), the light amount reduction sections (top surface side light amount reduction section 70, side surface side light amount reduction section 71, base end side light amount reduction section 72) are configured by light amount reduction members (first light amount reduction member 73, second light amount reduction member 74) separate from the housing 50, but this is not limiting. For example, the light amount reduction sections can be configured by applying a coating with a light amount reduction function (providing a coating layer) to the housing 50 or the chassis 54. The light amount reduction sections can also be configured by blending fine particles with a light amount reduction function into a part of the housing 50 or the chassis 54. The light amount reduction sections can also be configured by applying mechanical processing (such as embossing) to a part of the surface of the housing 50 or the chassis 54 to reduce the amount of light (light transmittance).

[0048] The location of the light reduction portion is not limited to the above-described embodiment. For example, the light reduction portion may be provided on the bottom surface of the housing (first housing member) (bottom-side light reduction portion). The base-side light reduction portion may be provided inside the housing (second housing member) (for example, a light reduction member may be attached to the inner surface of the second housing member).

[0049] Furthermore, the first housing member 51 and the second housing member 52 constituting the housing 50 may be formed of different materials. For example, the first housing member 51 and the second housing member 52 may be formed of materials with different light transmittances (in other words, the light transmittance of the first housing member 51 may be different from that of the second housing member 52).

[0050] Next, another embodiment of the drug solution administration device of the present invention will be described using the example shown in the drawings. In the following description, the same components as those of the drug solution administration device 1 described above will be designated by the corresponding names and symbols, and detailed description thereof will be omitted.

[0051] As shown in Figures 21 to 23, the drug solution administration device 1b of this embodiment is a drug solution administration device 1b that has a drive mechanism 30 that advances a plunger 11 that pushes out the drug solution 2 from a drug solution container 10 filled with the drug solution 2 toward the tip opening 12 of the drug solution container 10, and a housing 50b that can accommodate the drug solution container 10 and the drive mechanism 30.The drive mechanism 30 has a motor 31 that applies a drive force to the plunger 11 to advance the plunger 11, and an optical rotation detection unit 32 that optically detects the rotation of the motor 31.The optical rotation detection unit 32 has a light emitting unit 33 that emits detection light and a light receiving unit 34 that receives the detection light. The drug solution administration device 1b is accommodated inside the housing 50b and is provided with a chassis 54b that can be fixed to the housing 50b and that can hold or accommodate the optical rotation detection unit 32, the housing 50b being formed from a light-transmitting material that can transmit visible light, and the chassis 54b being formed from a light-impermeable material that makes it difficult for visible light to transmit, and having a hole 76 formed therein. Furthermore, the drug solution administration device 1b is equipped with a light reduction section that reduces the amount of light other than the detection light that enters the light receiving section 34, and the light reduction section is separate from the housing 50b and the chassis 54b and is composed of a light-shielding member 75 made of a light-resistant hard resin material that makes it difficult for visible light to pass through, and the light-shielding member 75 reduces the amount of light that enters the light receiving section 34 from a hole 76 formed in the chassis 54b.

[0052] In the drug solution administration device 1b of this embodiment, the chassis 54b is formed of a material that is difficult to transmit light. More specifically, as shown in FIGS. 22 and 23 , the chassis 54b is generally box-shaped overall and includes a first chassis (substrate) member 77 that forms a lower wall portion and a second chassis member 78 that forms a side wall portion (including a base end wall portion 56) and an upper wall portion. The optical rotation detector 32 is held and housed in a base end portion inside the chassis 54b. Specifically, the optical rotation detector 32 is held on the first chassis member 77 and housed in a space formed by the first chassis member 77 and the second chassis member 78. As shown in FIGS. 22 and 23 , a hole 76 is formed in the chassis 54b (here, the base end wall portion 56 of the second chassis member 78) to hold a predetermined member or as an unavoidable part of the molding process.

[0053] In this embodiment, the chassis 54b (first chassis member 77 and second chassis member 78) is formed of a material (light-impermeable material) that has a lower visible light transmittance than at least the material (light-transmitting material) that constitutes the housing 50b. Furthermore, the chassis 54b (first chassis member 77 and second chassis member 78) preferably has a lower transmittance for light with wavelengths of 700 to 1000 nm than the housing 50b (first housing member 51 and second housing member 52). This reduces the amount of light with wavelengths of 700 to 1000 nm that penetrates the housing 50b (first housing member 51 and second housing member 52) and enters the light-receiving unit 34, thereby reducing the possibility of malfunction of the optical rotation detector 32.

[0054] Furthermore, it is preferable that the chassis 54b (first chassis member 77 and second chassis member 78) have a total light transmittance of 30% or less. This effectively reduces the amount of light other than detection light entering the light-receiving unit 34 of the optical rotation detector 32, thereby reducing the possibility of malfunction of the optical rotation detector 32. Note that the "total light transmittance" referred to here refers to the value measured in accordance with JIS K7375:2008 (Plastics - Determination of total light transmittance and total light reflectance). The total light transmittance of the chassis 54b may vary depending on the part (for example, the total light transmittance of the first chassis member 77 may be different from the total light transmittance of the second chassis member 78).

[0055] The drug solution administration device 1b includes a light-blocking member 75 that is separate from the housing 50b and the chassis 54b and is made of a light-impermeable hard resin material that makes it difficult for visible light to pass through. Specifically, as shown in FIGS. 21 and 22 , the light-blocking member 75 is disposed adjacent to the base end wall portion 56 on a first chassis member 77 that protrudes in the base end direction from the base end wall portion 56 of the second chassis member 78, and is configured to block the hole 76 (at least a part of the hole 76) formed in the chassis 54b (the base end wall portion 56 of the second chassis member 78) from the base end side. Note that the light-blocking member 75 may be configured to block part or all of the hole 76 formed in the chassis 54b (the base end wall portion 56 of the second chassis member 78) from the base end side. In this embodiment, the light-shielding member 75 reduces the amount of light entering the light-receiving unit 34 from the hole 76 formed in the chassis 54b (base end wall portion 56), and functions as a light-amount reducing portion that reduces the amount of light other than detection light entering the light-receiving unit 34.

[0056] In this embodiment, the light-blocking member 75 is formed of a material (light-impermeable material) that has a lower visible light transmittance than at least the material (light-transmitting material) that constitutes the housing 50b. Furthermore, the light-blocking member 75 preferably has a lower transmittance for light with wavelengths of 700 to 1000 nm than the housing 50b (first housing member 51 and second housing member 52). This reduces the amount of light with wavelengths of 700 to 1000 nm that penetrates the housing 50b (first housing member 51 and second housing member 52) and enters the light-receiving unit 34, thereby reducing the possibility of malfunction of the optical rotation detector 32.

[0057] Furthermore, it is preferable that the light-shielding member 75 has a total light transmittance of 30% or less. This effectively reduces the amount of light other than the detection light entering the light-receiving unit 34 of the optical rotation detector 32, thereby reducing the possibility of malfunction of the optical rotation detector 32. Note that the "total light transmittance" referred to here is measured based on JIS K7375:2008 (Plastics - Determination of total light transmittance and total light reflectance). It is also preferable that the total light transmittance of the light-shielding member 75 is equal to or lower than the visible light transmittance of the chassis 54b.

[0058] In the medicinal solution administration device 1b of this embodiment, the housing 50b is formed from a light-transmitting material that allows visible light to pass through, making it possible to visually check the inside of the housing 50b (particularly the state of the medicinal solution container 10 held by the chassis 54b and housed in the housing 50b) from the outside, while the chassis 54b that can hold or house the optical rotation detection unit 32 is formed from a light-impermeable material that makes it difficult for visible light to pass through, thereby reducing the amount of light other than detection light that enters the light-receiving unit 34. Furthermore, the medicinal solution administration device 1b includes a light-shielding member 75 made of a light-impermeable hard resin material that blocks the hole 76 formed in the chassis 54b (the base-end wall portion 56 of the second chassis member 78) from the base end side, thereby effectively reducing the amount of light that enters the light-receiving unit 34 of the optical rotation detection unit 32 and reducing the possibility of malfunction of the optical rotation detection unit 32. [Explanation of symbols]

[0059] 1. Chemical solution administration device 2. Chemical Solution 10. Chemical container 11 Pusher 12 Tip opening 30 Drive mechanism 31 Motor 32 Optical rotation detector 33 Light-emitting part 34 Light receiving part 38 Lead screw 40 Blade 50 Housing 51 first housing member 52 second housing member 58 Bottom part 59 Top part 60 Side part 70 Light reduction section (upper surface light reduction section) 71 Light reduction section (side light reduction section) 72 Light intensity reduction section (proximal end side light intensity reduction section) 73 First light reduction member 74 Second light reduction member 90 Body Parts 100 Administration Equipment

Claims

1. A drug solution administration device including: a drive mechanism that advances a pusher that pushes out a drug solution from a drug solution container filled with the drug solution toward a tip opening of the drug solution container; and a housing that can accommodate the drug solution container and the drive mechanism, the drive mechanism includes a motor that applies a drive force to the plunger to move the plunger forward, and an optical rotation detection unit that optically detects rotation of the motor, the optical rotation detector includes a light emitter that emits detection light and a light receiver that receives the detection light, The drug solution administration device is characterized in that it includes a light amount reduction unit that reduces the amount of light other than the detection light that enters the light receiving unit.

2. The drug solution administration device is used by being attached to a living body part, the housing has a lower surface portion that is attached to the living body part, an upper surface portion that faces the lower surface portion with the optical rotation detection unit therebetween, and a pair of side surfaces that connect both side surfaces of the lower surface portion and the upper surface portion to each other; The drug solution administration device according to claim 1 , wherein the light reduction section is provided at least on the upper surface of the housing.

3. The drug solution administration device according to claim 2 , wherein the light reduction section is provided on the top surface and the side surface of the housing.

4. the optical rotation detector is disposed in a base end portion of the housing, The drug solution administration device according to claim 1 , wherein the light amount reducing unit includes a proximal-end light amount reducing unit provided on the proximal side of the optical rotation detecting unit.

5. The drug solution administration device described in claim 1 or 2, wherein the optical rotation detection unit is a transmissive photointerrupter in which the light-emitting unit and the light-receiving unit are arranged opposite each other across the detected unit, or a reflective photointerrupter in which the light-emitting unit and the light-receiving unit are arranged on the same side of the detected unit.

6. the housing is formed of a light-transmitting material that allows visible light to pass therethrough; The drug solution administration device described in claim 1 or 2, wherein the light receiving unit is capable of receiving light with a wavelength of 700 to 1000 nm, and the light reduction unit has a lower transmittance of light with a wavelength of 700 to 1000 nm than the housing.

7. the housing is formed of a light-transmitting material that allows visible light to pass therethrough; The drug solution administration device according to claim 1 or 2, wherein the light reduction unit is configured by a light reduction member separate from the housing.

8. The drug solution administration device according to claim 7 , wherein the light amount reducing member is made of an insulating material and is disposed inside the housing.

9. 3. The drug solution administration device according to claim 1, wherein the light amount reducing section has a total light transmittance of 30% or less.

10. the housing is formed of a light-transmitting material that allows visible light to pass therethrough; The drug solution administration device according to claim 1 or 2, wherein the light amount reducing portion includes a near-infrared absorbing material and constitutes a part of the housing.

11. 3. The drug solution administration device according to claim 1, wherein the light amount reducing section has a light absorbing or non-reflective portion on the side of the optical rotation detecting section.

12. The liquid medicine administration device according to claim 1 or 2, further comprising the liquid medicine container attached to the liquid medicine administration device.

13. A drug solution administration device including: a drive mechanism that advances a pusher that pushes out a drug solution from a drug solution container filled with the drug solution toward a tip opening of the drug solution container; and a housing that can accommodate the drug solution container and the drive mechanism, the drive mechanism includes a motor that applies a drive force to the plunger to move the plunger forward, and an optical rotation detection unit that optically detects rotation of the motor, the optical rotation detector includes a light emitter that emits detection light and a light receiver that receives the detection light, the drug solution administration device includes a chassis that is accommodated inside the housing, is fixable to the housing, and is capable of holding or accommodating the optical rotation detection unit; the housing is formed of a light-transmitting material that allows visible light to pass therethrough; the chassis is made of a light-impermeable material through which visible light is hardly transmitted, and has holes formed therein; the drug solution administration device includes a light amount reduction unit that reduces the amount of light other than the detection light entering the light receiving unit, the light amount reduction unit being separate from the housing and the chassis and being configured by a light-shielding member made of a light-resistant hard resin material that is difficult for visible light to transmit through; A medicinal liquid administration device, characterized in that the light-blocking member reduces the amount of light entering the light-receiving unit through the hole formed in the chassis.

Images