Medical solution administration device

Abstract

To provide an improved medical solution administration device capable of suppressing the backlash of a component when a shock is added.SOLUTION: A medical solution administration device 10 includes: a syringe 12 storing a medical solution; a pusher pushing out the medical solution in the syringe 12; a drive mechanism 26 for advancing the pusher; a chassis member 28 holding the syringe 12, the pusher, and the drive mechanism 26; and a housing 34 storing the chassis member 28, the syringe 12, the pusher, and the drive mechanism 26. The chassis member 28 has a base plate supporting the pusher and the drive mechanism 26, and a wall part projecting upward from the base plate, and the top edge of the wall part has a rib engaged with the housing 34.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drug solution administration device for extruding a drug solution from a syringe using a drive mechanism and administering the drug solution to a living body. [Background technology]

[0002] BACKGROUND ART Syringe pump-type drug solution administration devices have been proposed in the past, in which a syringe filled with a drug solution is pressed by a plunger to administer the drug solution into a living body (for example, Patent Document 1).

[0003] In this medical solution administration device, the syringe and the drive mechanism are mounted on a chassis separate from the housing, and the syringe and the drive mechanism are held inside the housing via the chassis. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 168988 Summary of the Invention [Problem to be solved by the invention]

[0005] Because a drug solution administration device is a precision instrument equipped with a drive mechanism, it is required to have a structure that can suppress rattle of internal parts, which can be a cause of failure when an impact is applied.

[0006] An object of the present invention is to solve the above-mentioned problems. [Means for solving the problem]

[0007] One aspect of the following disclosure is a drug solution administration device comprising: a syringe containing a drug solution; a plunger that pushes the drug solution out of the syringe; a drive mechanism that moves the plunger forward; a chassis member that holds the syringe, the plunger, and the drive mechanism; and a housing that houses the chassis member, the syringe, the plunger, and the drive mechanism, wherein the chassis member has a base plate that supports the plunger and the drive mechanism, and a wall portion that protrudes upward from the base plate, and the upper end of the wall portion has a rib that engages with the housing. [Effects of the Invention]

[0008] The medicinal solution administration device according to the above aspect can suppress rattle of the internal parts. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram of a state in which a drug solution administration device according to an embodiment is used. [Figure 2] FIG. 2 is an exploded perspective view of the drug solution administration device of FIG. [Figure 3] 3A is a view showing the main body of the housing of FIG. 1 as seen from the opening side, and FIG. 3B is a view showing the inside of the lid. [Figure 4] FIG. 4A is a perspective view of a chassis member to which a syringe, a plunger, and a drive mechanism are assembled, and FIG. 4B is a perspective view of only the chassis member. [Figure 5] 5A is an explanatory diagram showing the connection relationship between the syringe, plunger, and drive mechanism, and FIG. 5B is a perspective view of the underside of the chassis member of FIG. 4A. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] 8A is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 2, and FIG. 8B is a perspective view of the control board. [Figure 9]FIG. 9A is a perspective view of a chassis member according to a first modified example of the embodiment, and FIG. 9B is a cross-sectional view showing a connection structure between a housing according to the first modified example and the chassis member of FIG. 9A. [Figure 10] FIG. 10 is a cross-sectional view showing a connection structure between a housing and a chassis member according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] As shown in FIG. 1, a medicinal solution administration device 10 according to this embodiment is used to administer a medicinal solution M filled in a syringe 12 into a living organism L. The medicinal solution administration device 10 continuously administers the medicinal solution M to the living organism L over a relatively long period of time. Note that the medicinal solution administration device 10 can also administer the medicinal solution M to the living organism L by an intermittent administration operation. The medicinal solution M is not particularly limited, but examples thereof include a protein preparation, a narcotic analgesic, and a diuretic.

[0011] In use, an administration line 14 is connected to the medicinal solution administration device 10. The administration line 14 is, for example, a patch-type needle-equipped tube 16. The needle-equipped tube 16 has a connector 18, a liquid delivery tube 20, and a patch unit 22. The patch unit 22 is fixed to the living organism L with a needle 24 piercing the skin of the living organism L. The medicinal solution M from the medicinal solution administration device 10 is administered to the living organism L through the administration line 14. Note that the administration line 14 is not limited to the needle-equipped tube 16, and may be a needle member directly connected to the port 12a, or the like.

[0012] The medicinal solution administration device 10 will be described in more detail below.

[0013] 2, the drug solution administration device 10 includes a syringe 12, a drive mechanism 26, a chassis member 28, a control board 30, and a housing 34. The housing 34 accommodates the syringe 12, the drive mechanism 26, the chassis member 28, the control board 30, a battery 32 (see FIG. 4A), and a plunger 70 (see FIG. 4A).

[0014] The housing 34 has a main body 36 and a lid 38. As shown in FIG. 1, the main body 36 has a generally rectangular shape in a plan view. As shown in FIG. 2, the main body 36 has a cylindrical shape with an internal hollow portion 36d extending in the axial direction. The main body 36 has a tip wall 36a at its tip. The tip wall 36a partially closes the tip of the hollow portion 36d. The tip wall 36a has an insertion portion 36b through which the tip (port 12a) of the syringe 12 is inserted. The insertion portion 36b has an inner periphery of a seal member 36c that fits tightly against the outer circumferential surface 12b of the syringe 12. The seal member 36c fits tightly against the outer circumferential surface 12b of the syringe 12 to liquid-tightly seal the gap between the insertion portion 36b and the syringe 12, thereby preventing water and dust from entering the housing 34.

[0015] As shown in Fig. 3A, the main body 36 has a hollow portion 36d that accommodates the chassis member 28 (see Fig. 2) therein. The hollow portion 36d extends in the axial direction and forms an opening 36e at the base end of the main body 36. As shown in Fig. 2, the chassis member 28 is inserted into the hollow portion 36d of the main body 36 through the opening 36e. As shown in Fig. 3A, the main body 36 has a rail portion 40 that protrudes toward the hollow portion 36d.

[0016] In this embodiment, the rail portion 40 is located on the upper surface 36f of the main body 36. The upper surface 36f is a surface having an operation button 42. The rail portion 40 extends in the axial direction of the main body 36. The rail portion 40 has grooves 41 extending in the axial direction, and the grooves 41 hold ribs 44 (described later) of the chassis member 28, thereby suppressing rattle of the chassis member 28 in the width direction and rotational direction. Furthermore, when the chassis member 28 is accommodated in the main body 36 of the housing 34, the ribs 44 can be slid and inserted into the grooves 41 of the rail portion 40, facilitating assembly of the medicinal solution administration device 10. In the illustrated example, two rail portions 40 are provided, but the number of rail portions 40 is not limited thereto, and one or more (three or more) rail portions 40 may be provided in the main body 36.

[0017] The rail portion 40 may have a step portion 40a and an end face 40b that prevent the chassis member 28 from moving toward the tip. The step portion 40a and the end face 40b come into contact with a stopper plate portion 54g of the chassis member 28, which will be described later, and prevent the chassis member 28 from displacing toward the tip. Note that the structure that comes into contact with the stopper plate portion 54g may be located in a portion of the main body 36 other than the rail portion 40. In this case, the rail portion 40 does not need to have a structure that prevents the chassis member 28 from moving toward the tip.

[0018] The main body 36 has a bottom surface 36i located opposite the top surface 36f, which abuts against a base plate 46 (described later) of the chassis member 28 to hold the chassis member 28. The chassis member 28 is held inside the main body 36 by being sandwiched between the rail portion 40 of the main body 36 and the bottom surface 36i.

[0019] As shown in FIG. 2, the lid portion 38 of the housing 34 covers the opening 36e of the main body portion 36, thereby closing the cavity 36d. A rubber gasket 37 is disposed at the mating portion between the lid portion 38 and the main body portion 36, and the lid portion 38 liquid-tightly seals the cavity 36d. The lid portion 38 sandwiches the chassis member 28 between itself and the tip wall 36a of the main body portion 36 to prevent rattling in the axial direction. The lid portion 38 also has a mating structure 38a. The mating structure 38a includes a locking piece 39 that fits into the claw portion 35 (see FIG. 6) of the main body portion 36. The lid portion 38 is fixed to the main body portion 36 via the mating structure 38a.

[0020] Although not particularly limited, the lid portion 38 may be integrally formed from a transparent resin material. In this case, as shown in FIG. 3B, the lid portion 38 may have a light guide portion 48 and a light emitter portion 50. The light emitter portion 50 functions as a display portion that notifies the user of the operating status of the medicinal solution administration device 10 by emitting light guided from a light emitting element 86 (see FIG. 8B) of the control board 30. The light guide portion 48 is a rib-like structure that protrudes from the lid portion 38 toward the cavity portion 36d. The light guide portion 48 has a first end portion 48a and a second end portion 48b. The first end portion 48a is located opposite the light emitting element 86. The second end portion 48b is located inside the light emitting portion 50 on the outer surface of the lid portion 38. The light guide portion 48 guides light from the light emitting element 86 of the control board 30 to the light emitting portion 50. The light emitting portion 50 has an uneven structure 50a for efficiently emitting light to the outside. In the illustrated example, a pair of light emitting units 50 are arranged at the corners of the cover unit 38 .

[0021] As shown in FIGS. 2, 4A, and 5B, the chassis member 28 holds the syringe 12, the drive mechanism 26, the control board 30, the battery 32, and the plunger 70. As shown in FIGS. 4B and 5B, the chassis member 28 has a base plate 46 and a wall portion 54. The wall portion 54 is formed integrally with the base plate 46. The wall portion 54 may have a frame-like structure that is connected as a whole. Alternatively, the wall portion 54 may have a frame-like structure formed by multiple separate plate-like portions. In the illustrated example, the wall portion 54 has a structure that includes multiple plate-like portions. The chassis member 28 has a battery holding portion 56, a board holding portion 58, a syringe holding portion 60, a drive mechanism holding portion 62, and a plunger holding portion 64. The battery holding portion 56, the board holding portion 58, the syringe holding portion 60, the drive mechanism holding portion 62, and the plunger holding portion 64 are formed by the wall portion 54.

[0022] As shown in FIG. 4B, the base plate 46 is located below the chassis member 28 and is formed in a plate shape. As shown in FIG. 5B, an abutment surface 46a that abuts against the bottom surface 36i of the housing 34 is formed on the lower surface of the base plate 46. The abutment surface 46a has a flat plate-like portion and a rib-like portion that extend in the axial direction. The abutment surface 46a has a curved surface that follows the curved shape of the inner surface of the bottom surface 36i of the housing 34 and is in surface contact with the bottom surface 36i. By abutting against the bottom surface 36i, the abutment surface 46a prevents downward displacement (wobble) of the chassis member 28.

[0023] The chassis member 28 further has a chassis-side contact portion 46b. The chassis-side contact portion 46b is a portion that contacts the lid-side contact portion 38b of the lid portion 38. By contacting the lid portion 38, the chassis-side contact portion 46b prevents displacement (wobbling) of the chassis member 28 toward the base end in the axial direction. In this embodiment, the chassis-side contact portion 46b is configured as a step portion on the base end side of the base plate 46.

[0024] As shown in FIG. 4A , the base plate 46 supports the syringe 12 and the drive mechanism 26 from below. The battery holding portion 56 is formed to protrude from the base plate 46 toward the tip. In other words, the base plate 46 is not formed in the battery holding portion 56. The wall portion 54 has multiple plate-like portions that protrude upward from the base plate 46 in a wall-like manner. The plate-like portions that make up the wall portion 54 are made of a resin material and are formed integrally with the base plate 46. The wall portion 54 is formed in a frame shape. A portion of the wall portion 54 protrudes toward the tip beyond the base plate 46 to form the battery holding portion 56. The wall portion 54 separates the battery holding portion 56, the syringe holding portion 60, the drive mechanism holding portion 62, and the plunger holding portion 64.

[0025] The wall 54 has a support surface 54a near its upper end. The support surface 54a is formed on multiple wall portions 54. The multiple support surfaces 54a are located at the same height. The chassis member 28 has a board holding portion 58 that positions (vertically and / or in-plane) and holds the control board 30. The support surface 54a forms part of the board holding portion 58 that supports the control board 30 in the vertical direction. Because the support surface 54a is located higher than the drive mechanism 26, the syringe 12, and the battery holding portion 56, the control board 30 is held at a higher position than the drive mechanism 26, the syringe 12, and the battery holding portion 56. As shown in FIG. 2, the control board 30 is arranged so as to overlap above the drive mechanism 26, the syringe 12, and the battery holding portion 56, allowing it to be accommodated compactly inside the housing 34.

[0026] The wall portions 54 on one and the other widthwise sides of the base plate 46 form sidewall portions 54b. The sidewall portions 54b extend in the axial direction. The sidewall portions 54b have support surfaces 54a near their upper ends in the height direction. The sidewall portions 54b also have ribs 44 that protrude higher than the support surfaces 54a. The ribs 44 on the sidewall portions 54b are located outside the support surfaces 54a in the width direction. The ribs 44 sandwich and hold the control board 30 from both sides, thereby positioning the control board 30 in the in-plane direction and forming board holding portions 58 that suppress rattle of the control board 30 in the in-plane direction. In other words, the upper portion of the wall portions 54 forms the board holding portions 58, and at least a portion of the ribs 44 also serve as the board holding portions 58. The ribs 44 protrude higher than the support surfaces 54a and engage with the rail portions 40 of the housing 34. The lower ends of the side wall portions 54b are connected to the sides of the base plate 46. The lower ends of the side wall portions 54b (the sides of the base plate 46) of the chassis member 28 abut against the bottom surface 36i of the housing 34. The upper and lower ends of the side wall portions 54b abut against the housing 34, allowing the chassis member 28 to be housed without rattle.

[0027] As shown in FIG. 4B, the side wall portion 54b has a holding structure 55 that holds the control board 30. The holding structure 55 is one aspect of the rib 44, and is included in the board holding portion 58 in this embodiment. The holding structure 55 has an engagement hole 55a formed in the side wall portion 54b that receives the engagement piece 30a of the control board 30. The engagement hole 55a is located at the same height as the support surface 54a. The holding structure 55 also has a claw portion 55b that holds down the control board 30 from above, at a position facing the engagement hole 55a across the control board 30. As shown in FIG. 2, the holding structure 55 having the engagement hole 55a and the claw portion 55b holds the control board 30 and prevents the control board 30 from lifting up relative to the chassis member 28.

[0028] Furthermore, the side wall portion 54b has stopper plates 54g that protrude laterally in the width direction. The stopper plates 54g are respectively disposed on one side wall portion 54b and the other side wall portion 54b in the width direction. The stopper plates 54g abut against the step portion 40a or the end face 40b of the rail portion 40, thereby preventing the chassis member 28 from displacing toward the tip in the axial direction relative to the housing 34.

[0029] In the chassis member 28, the syringe holding portion 60 holds the base end of the syringe 12. The syringe holding portion 60 has a flange accommodating groove 60a that accommodates the flange 12d at the base end of the syringe 12. A locking piece 66 fits into the flange accommodating groove 60a. When the locking piece 66 is fitted into the flange accommodating groove 60a, the flange 12d of the syringe 12 is fixed in the flange accommodating groove 60a, and the syringe 12 is fixed to the syringe holding portion 60.

[0030] The plunger holding portion 64 is located on the proximal end side of the syringe holding portion 60. The plunger holding portion 64 is formed to extend in the axial direction. As shown in FIG. 6 , the plunger holding portion 64 accommodates a plunger 70 connected to a gasket 68 of the syringe 12.

[0031] As shown in FIG. 4A, the drive mechanism holding portion 62 has a motor accommodating portion 62a and a gear accommodating portion 62b. The motor accommodating portion 62a is a portion that accommodates the motor 72. In this embodiment, the motor accommodating portion 62a extends long in the axial direction and can accommodate a small motor 72 that is long in the axial direction. The rotation shaft of the motor 72 faces the axial direction. In this embodiment, the motor accommodating portion 62a is arranged in parallel to the side of the plunger holding portion 64 in the width direction. This arrangement can reduce the axial dimension of the chassis member 28 and is suitable for miniaturizing the chassis member 28.

[0032] The gear accommodating portion 62b accommodates a gear mechanism 74 that transmits the rotational force of the motor 72 to the shaft 70b. The gear accommodating portion 62b is located on the base end side of the motor accommodating portion 62a and the plunger holding portion 64. The gear accommodating portion 62b extends in the width direction and accommodates multiple gears (75a, 75b, 75c) (three in the illustrated example). As shown in FIG. 4B, the gear accommodating portion 62b has a bearing that supports the gear 75.

[0033] As shown in FIG. 5B, the battery holding portion 56 opens toward the lower side of the chassis member 28 and accommodates the battery 32 from below. The battery 32 is, for example, a button battery. The battery holding portion 56 accommodates one or more batteries 32. An electrode terminal 57 is disposed in the battery holding portion 56. The electrode terminal 57 is electrically and mechanically connected to the control board 30 by soldering.

[0034] The chassis member 28 is configured as described above. Next, the syringe 12, the drive mechanism 26, and the control board 30 will be described.

[0035] As shown in FIG. 5A, the syringe 12 has a hollow cylindrical shape. As shown in FIG. 6, the syringe 12 has a chamber 12c filled with a medicinal liquid M. The syringe 12 has a port 12a, a gasket 68, and a flange 12d. The port 12a is located at the tip of the syringe 12. The port 12a has a rubber stopper and seals the tip of the chamber 12c. The gasket 68 is located inside the syringe 12 and seals the base end of the chamber 12c. The gasket 68 is advanced toward the tip by a plunger 70 to push out the medicinal liquid M from the chamber 12c. The flange 12d is located at the base end of the syringe 12 and is held by the chassis member 28. The locking piece 66 fits into the gap between the flange 12d and the flange receiving groove 60a to prevent the syringe 12 from falling off the chassis member 28.

[0036] As shown in FIG. 5A, the drive mechanism 26 includes a plunger 70, a motor 72, and a gear mechanism 74. The plunger 70 is disposed at the base end of the syringe 12. As shown in FIG. 6, the plunger 70 includes a shaft 70b and a pressing portion 70c. The shaft 70b is a rod-shaped member extending in the axial direction. The shaft 70b has a screw groove 70a on its outer periphery and is rotatable around an axis of rotation in the axial direction. The pressing portion 70c is a plate-shaped member disposed outside the shaft 70b and extending in the axial direction. The pressing portion 70c is threadedly engaged with the screw groove 70a. When the shaft 70b rotates, the pressing portion 70c moves in the axial direction due to the screw groove 70a. The pressing portion 70c is displaced toward the tip side to press the gasket 68 of the syringe 12 toward the tip.

[0037] The motor 72 is located on a side of the plunger 70 in the width direction. The rotation shaft of the motor 72 faces the base end in the axial direction and rotates around the axis. The motor 72 is rotated by a drive current from the control board 30. The gear mechanism 74 transmits the rotational motion of the motor 72 to the shaft 70b. In this embodiment, the gear mechanism 74 has three gears 75 (a first gear 75a, a second gear 75b, and a third gear 75c). The first gear 75a is connected to the drive shaft of the motor 72. The third gear 75c is connected to the shaft 70b. The second gear 75b is disposed between the first gear 75a and the third gear 75c and transmits rotational force therebetween. An encoder plate 75d is connected to the first gear 75a. The encoder plate 75d is disposed so as to pass through the detection position of the encoder 78 (see FIG. 8B) on the control board 30. The encoder plate 75d enables the control board 30 to detect the rotation speed of the motor 72.

[0038] 2, the control board 30 has a tactile switch 80 on its upper surface. The tactile switch 80 is located inside the operation button 42 formed on the upper surface portion 36f of the housing 34. The tactile switch 80 receives operation input from the user via the operation button 42. As shown in FIG. 8B, the control board 30 has a contact switch 84, an encoder 78, and a light-emitting element 86 on its lower surface facing the drive mechanism 26.

[0039] The contact switch 84 is located at a position where it can come into contact with the pressing portion 70c of the plunger 70 and detects the position of the pressing portion 70c. The encoder 78 is located at a position where the encoder plate 75d passes through. The encoder 78 has the encoder plate 75d sandwiched between the light receiving and emitting portions and detects the rotation speed of the motor 72. The light emitting element 86 is, for example, a full-color LED element and indicates the operating status of the medicinal solution administration device 10 by color and flashing pattern. The light emitting element 86 is located at a position facing the first end 48a of the light guiding portion 48. Light emitted from the light emitting element 86 is emitted to the outside from the light emitting portion 50 of the lid portion 38 via the light guiding portion 48. The control board 30, although not specifically described with reference to figures, includes a control circuit that controls the operation of each portion of the medicinal solution administration device 10.

[0040] The medicinal liquid administration device 10 of this embodiment is configured as described above, and its operation will be described below.

[0041] 6, the housing 34 of the drug solution administration device 10 has a structure in which a cylindrical main body 36 is provided and a lid 38 is provided at the base end of the main body 36. The chassis member 28 is housed inside the main body 36. The chassis member 28 integrally houses the syringe 12, the drive mechanism 26, the control board 30, and the battery 32, thereby protecting these components from the effects of deformation of the housing 34.

[0042] As shown in FIG. 7, the chassis member 28 is prevented from moving downward by the abutment surface 46a on the bottom side abutting against the bottom surface 36i of the housing 34. Also, as shown in FIG. 8A, the chassis member 28 has a rib 44 provided on the upper end of the side wall 54b that engages with a groove 41 formed in the rail portion 40 of the main body 36. The rib 44 and the rail portion 40 prevent the chassis member 28 from moving in the width direction and the rotation direction (wobbling). The rib 44 also abuts against the upper surface 36f of the housing 34, preventing the chassis member 28 from moving upward. The rib 44 is disposed on the wall portion 54, which increases the rigidity of the chassis member 28 and provides a reinforcing effect. This prevents deformation of the chassis member 28 due to external forces or impacts, thereby minimizing the effects on the drive mechanism 26.

[0043] 4B, stopper plate portion 54g provided on side wall portion 54b abuts against step portion 40a and end face 40b of rail portion 40, preventing axial displacement of chassis member 28 toward the tip. As shown in FIG. 7, chassis-side abutment portion 46b provided on base plate 46 abuts against lid-side abutment portion 38b of lid portion 38, preventing axial displacement of chassis member 28 toward the base end.

[0044] The above structure can prevent the chassis member 28 from rattling inside the housing 34.

[0045] (First Modification of the Embodiment) 9A and 9B, in a medicinal solution administration device 10A of the first modified example, a chassis member 28A differs from the chassis member 28 shown in Fig. 4B in that a second rib 45A is further formed on the side wall portion 54b so as to extend outward. Note that in this modified example, a description of the same configuration as the embodiment will be omitted.

[0046] The second rib 45A is formed by protruding so that the base plate 46 extends outward from the side wall portion 54b (in the wall thickness direction of the side wall portion 54b). The second rib 45A protrudes slightly outward from the side wall portion 54b and extends long in the axial direction. The second rib 45A is located below the rib 44 and closer to the lower end than the center in the up-down direction of the side wall portion 54b. The second rib 45A may be formed at the lower end of the chassis member 28A.

[0047] 9B, the second rib 45A is accommodated in the main body 36A of the housing 34A according to this modification. The main body 36A has second rails 43A that protrude inward on the side surfaces 36g and 36h. The second rails 43A are located in portions corresponding to the second ribs 45A and have second grooves 47A that extend in the axial direction. The second grooves 47A engage with the second ribs 45A to hold the chassis member 28A.

[0048] In this modification, the chassis member 28A can be fixed to the housing 34A via the second rib 45A, so that rattles of the internal parts of the medicinal solution administration device 10A can be more effectively suppressed.

[0049] (Second Modification of the Embodiment) As shown in FIG. 10 , in a medical solution administration device 10B of this modified example, a second rail portion 43B is provided on a chassis member 28B, and a second rib 45B is provided on a main body portion 36B of a housing 34B. The second rail portion 43B of the chassis member 28B protrudes slightly outward from a side wall portion 54b and extends long in the axial direction. The second rail portion 43B is located below the rib 44 and closer to the lower end than the center in the vertical direction of the side wall portion 54b. The second rail portion 43B may be formed at the lower end of the chassis member 28B. The second rail portion 43B of the chassis member 28B has a second groove portion 47B extending in the axial direction. The second rail portion 43B engages with the second rib 45B of the housing 34B at the second groove portion 47B.

[0050] The housing 34B has a second rib 45B that protrudes toward the side wall portion 54b. The second rib 45B is located in a portion corresponding to the second rail portion 43B and extends in the axial direction. The second rib 45B of the housing 34B engages with the second rail portion 43B of the chassis member 28B.

[0051] This modification also provides the same effects as those of the chemical solution administration device 10A according to the modification shown in FIGS. 9A and 9B.

[0052] The present embodiment can be summarized as follows.

[0053] The drug solution administration device (10) comprises a syringe (12) containing a drug solution (M), a plunger (70) that pushes the drug solution out of the syringe, a drive mechanism (26) that moves the plunger forward, a chassis member (28) that holds the syringe, the plunger, and the drive mechanism, and a housing (34) that houses the chassis member, the syringe, the plunger, and the drive mechanism, and the chassis member has a base plate (46) that supports the plunger and the drive mechanism and a wall portion (54) that protrudes upward from the base plate, and the upper end of the wall portion has a rib (44) that engages with the housing.

[0054] The ribs of the liquid medicine administration device described above can hold the chassis member inside the housing without rattle. Because the ribs of this liquid medicine administration device are provided on a strong wall portion of the chassis member, deformation of the chassis member due to external force or impact can be suppressed, and rattle of the internal parts can be suppressed.

[0055] In the above-described medicinal solution administration device, the wall portion may include a side wall portion (54b) located on a side portion of the base plate, and the side wall portion may have the rib at an upper end. By providing the rib on the side wall portion provided on the outer side in the width direction of the base plate, this medicinal solution administration device can more effectively suppress rattle of the chassis member.

[0056] In the above-described drug solution administration device, the housing may have a rail portion (40) extending in the axial direction and having a groove portion (41) for holding the rib, and the chassis member may be held to the housing via the rail portion. Such a rail portion can achieve both ease of assembly of the chassis member and the housing and suppression of rattle of the chassis member.

[0057] The above-described liquid medicine administration device may further include a control board (30) that controls the drive mechanism, and the chassis member may have a board holder (58) on the upper portion that positions and holds the control board. This board holder enables the control board to be held on the chassis member, thereby integrating the control board with the chassis member. In this liquid medicine administration device, the control board can be protected by the chassis member. Furthermore, the structure in which the control board is integrated with the chassis member facilitates assembly during the manufacturing process.

[0058] In the above-described medicinal solution administration device, the chassis member may have a second rib (45A) below the rib, protruding outward from the side wall portion and extending in the axial direction, and the housing may have a second rail portion (43A) extending in the axial direction and having a second groove portion (47A) formed therein for holding the second rib. This medicinal solution administration device can more effectively suppress rattle of internal components.

[0059] In the above-described medicinal solution administration device, the chassis member may have a second rail portion (43B) on the side wall portion below the rib and having a second groove portion (47B) extending in the axial direction, and the housing may have a second rib (45B) protruding toward the side wall portion, extending in the axial direction, and held in the second groove portion. This medicinal solution administration device can effectively suppress rattle of internal parts.

[0060] In the liquid medicine administration device, the control board may be disposed above the plunger and the drive mechanism. In this liquid medicine administration device, the control board can be housed compactly inside the housing, allowing the housing to be made smaller.

[0061] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0062] 10, 10A, 10B...medicinal solution administration device 12...syringe 26... Drive mechanism 28, 28A, 28B... Chassis members 30...Control board 34, 34A, 34B...Housing 36, 36A, 36B...Main body 36a...Tip wall 36e...Opening part 38...Lid part 40...Rail section 44...Rib 46...Base plate 54...Wall

Claims

1. A syringe containing a medicinal liquid; A pusher for pushing out the drug solution from the syringe; A drive mechanism for advancing the plunger; a chassis member that holds the syringe, the plunger, and the drive mechanism; a housing that accommodates the chassis member, the syringe, the plunger, and the drive mechanism, the chassis member has a base plate supporting the pusher and the drive mechanism, and a wall portion protruding upward from the base plate, The upper end of the wall portion has a rib that engages with the housing. Drug administration device.

2. A medicinal solution administration device as described in claim 1, wherein the housing has a rail portion extending in the axial direction and having a groove portion formed therein for holding the rib, and the chassis member is held in the housing via the rail portion.

3. 2. The drug solution administration device according to claim 1, further comprising a control board for controlling the drive mechanism, the chassis member having a board holding portion at an upper portion thereof for positioning and holding the control board.

4. The drug solution administration device according to claim 3 , wherein the control board is disposed above the plunger and the drive mechanism.

5. A medicinal solution administration device as described in any one of claims 1 to 4, wherein the wall portion includes a side wall portion located on a side of the base plate, and the side wall portion has the rib at an upper end.

6. A medicinal solution administration device as described in claim 5, wherein the chassis member has a second rib below the rib, protruding outward from the side wall portion and extending in the axial direction, and the housing has a second rail portion extending in the axial direction and having a second groove portion formed therein for holding the second rib.

7. A medicinal solution administration device as described in claim 5, wherein the chassis member has a second rail portion on the side wall portion below the rib and having a second groove portion extending in the axial direction formed therein, and the housing has a second rib that protrudes toward the side wall portion, extends in the axial direction, and is held in the second groove portion.

Images