JP2011067229A - Attachment for holding cylinder of syringe and syringe drive device having the attachment mounted thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the attachment mounted on a syringe drive device to certainly hold two kinds of syringes different in outer shape. <P>SOLUTION: The attachment is mounted on the syringe drive device for driving the pistons of the syringes constituted of the cylinders having flanges provided thereto on the rear end sides thereof and the pistons inserted in the cylinders in a freely movable manner. A first recessed part 2 in which the cylinder of the first syringe is fitted, a second recessed part 4 in which the cylinder of the second syringe different in outer shape from the cylinder of the first syringe is fitted and a flange receiving groove 3 in which the flanges of the cylinders of the first and second syringes are fitted in common are formed to an attachment body 1 to be provided in adjacent relation in the order of the first recessed part 2, the flange receiving groove 3, and the second recessed part 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an attachment for holding a cylinder of a syringe and a syringe driving device for driving a piston of a syringe held by the attachment.

  Conventionally, in the case of preparing a drug for infusion in a hospital, for example, a plurality of bottled drugs are extracted with a syringe, and the drugs are mixed and prepared in the syringe. And the chemical | medical agent after this preparation is extruded from a syringe, for example, is filled with an infusion bag.

  This syringe is composed of a cylindrical cylinder having a liquid injection port at one end and an opening at the other end, and a piston movably inserted into the cylinder from the opening at the other end of the cylinder. When the medicine is drawn out from the bottle using this syringe, the piston is drawn out from the cylinder, and when the medicine is pushed out to the drip bag or the like, the piston is pushed into the cylinder.

  However, in order to withdraw the drug from the bottle, the piston must be pulled against the negative pressure generated when the piston is pulled, and in order to push the drug into an infusion bag, etc. The piston must be pushed against the positive pressure generated by the intervening filter, the narrow injection port of the cylinder, the injection needle provided in the injection port, and the like. At this time, the reaction force due to the negative pressure or the positive pressure is extremely large as several tens N.

  Therefore, conventionally, a syringe drive device that drives the piston of the syringe has been proposed as a device that supports the syringe operation. For example, in Patent Document 1, the outer shape of a cylinder is held by a support member provided on the main body in a state where a non-slip flange provided on the rear end side of the cylinder is fitted in a flange receiving groove provided on the main body. A syringe drive is disclosed. Further, for example, Patent Literature 2 discloses a syringe drive device including a syringe interface that holds the rear end side of a cylinder.

  Here, the syringe drive device disclosed in Patent Document 2 will be described in more detail. In this syringe drive device, a cradle extending forward is attached to the front wall of the main body. Two syringe adapter holding portions are provided in parallel at the front end of the cradle. These syringe adapter holding parts hold syringe adapters, respectively. The syringe adapter has a substantially semicircular inner surface that matches the outer shape of the cylinder that it holds, and a flange receiving groove into which a flange provided on the rear end side of the cylinder fits, and holds the rear end side of the cylinder . When the syringe is held by the syringe adapter fitted to the syringe adapter holding portion, the cylinder of the syringe projects forward from the front end of the cradle, and the piston moves backward, that is, toward the front wall of the main body of the syringe drive device. Protruding. The syringe interface includes these cradle, syringe adapter holding portion, and syringe adapter, and is attached to the front wall of the main body of the syringe drive device. This syringe drive device includes a drive member for individually driving the pistons of the two syringes held by the syringe interface in its main body.

JP 59-51400 A Japanese Patent No. 4256667

  As described above, conventionally, a syringe driving device that drives a piston of a syringe has been proposed as a device that supports syringe operation. However, syringes have different cylinder outlines (length and diameter) for each volume, and even cylinders have different cylinder outlines for the same volume. Therefore, in the syringe drive device that holds the outer shape of the cylinder by the support member provided in the main body while the flange of the cylinder is fitted in the flange receiving groove provided in the main body, only the syringe having a certain outer shape is reliably held. The holding of syringes with other outer shapes becomes unstable. Therefore, in order to ensure the holding of the syringe, the user of the syringe driving device has to prepare a syringe driving device for each outer shape of the syringe to be used. Moreover, in the syringe drive device which holds a syringe using a syringe adapter, since the external shape of the syringe that can be reliably held is different for each syringe adapter, the user of the syringe drive device must have the external shape of the syringe to be used. It was necessary to prepare a syringe adapter.

  Furthermore, in the conventional syringe drive device, when holding a plurality of syringes having different outer shapes, the positions of the tips of the injection needles attached to the syringes are not constant, and the workability of sucking and extruding the chemical solution is reduced. There was also the problem of getting worse.

  An object of this invention is to provide the attachment which can hold | maintain two types of syringes from which an external shape differs in view of the said problem, and the syringe drive device with which the attachment is mounted | worn.

  Furthermore, the present invention provides an attachment capable of making the position of the tip of the injection needle attached to the syringe constant in the syringe driving device and the attachment, even when two types of syringes having different outer shapes are held. It aims at providing the syringe drive device with which it is equipped.

  An attachment according to the present invention is an attachment that is attached to a syringe drive device that drives the piston of a syringe that includes a cylinder having a flange on the rear end side and a piston that is movably inserted into the cylinder. The attachment body has a first recess into which a cylinder of a first syringe is fitted, a second recess into which a cylinder of a second syringe having a cylinder shape different from that of the first syringe is fitted, and the first A flange receiving groove into which the flanges of the cylinders of the first and second syringes are commonly fitted is formed by connecting the first recess, the flange receiving groove, and the second recess in this order. And

  In the attachment of the present invention described above, the first recess, the flange receiving groove, and the first from the tip of the first syringe in which a flange is fitted in the flange receiving groove and the cylinder is supported by the first recess. A distance to the center position of the attachment main body in the direction in which the two recesses are connected, and the center position from the tip of the second syringe in which a flange is fitted in the flange receiving groove and the cylinder is supported by the second recess The flange receiving groove may be formed at a position where the distance up to is equal.

  The syringe drive device of the present invention is provided with a fitting portion to which the above-described attachment of the present invention is fitted, and drives the piston of the syringe held by the attachment fitted to the fitting portion. And

  According to the preferred form of the attachment of the present invention, two types of syringes having different outer shapes can be reliably held. Therefore, according to the preferable form of the attachment and the syringe drive device of the present invention, the user of the syringe drive device only needs to prepare a smaller number of attachments than the types of the outer shape of the syringe to be used.

  Moreover, according to the preferable form of the attachment of this invention, even when holding two types of syringes having different outer shapes, the position of the tip of the injection needle attached to these syringes is made constant in the syringe drive device. Can do. Therefore, according to the preferable form of the attachment and the syringe drive device of the present invention, in the syringe drive device, the position of the tip of the injection needle attached to at least two types of syringes having different outer shapes can be made constant, As a result, the workability of sucking and extruding the chemical solution can be improved.

The perspective view of the attachment concerning an embodiment of the invention The top view of the attachment concerning an embodiment of the invention The front view of the attachment concerning an embodiment of the invention The rear view of the attachment concerning an embodiment of the invention The perspective view which shows a mode that a syringe is hold | maintained by the attachment which concerns on embodiment of this invention. The top view which shows a mode that a 1st syringe and a 2nd syringe are hold | maintained with the attachment which concerns on embodiment of this invention. The perspective view which shows a mode that the attachment main body is fitted to the syringe drive device which concerns on embodiment of this invention in the state which removed the cylinder pressing part and the piston restraint part. The perspective view which shows schematic structure of the syringe drive device which concerns on embodiment of this invention. The top view which shows schematic structure of the principal part of the syringe vicinity of the syringe drive device which concerns on embodiment of this invention. The perspective view which shows the 1st state of the mechanism part of the syringe drive device which concerns on embodiment of this invention. The perspective view which shows the 2nd state of the mechanism part of the syringe drive device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the attachment and syringe drive device of the present invention will be described with reference to the drawings. However, elements previously described are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  1 is a perspective view of an attachment according to the embodiment of the present invention, FIG. 2 is a plan view of the attachment according to the embodiment of the present invention, FIG. 3 is a front view of the attachment according to the embodiment of the present invention, and FIG. FIG. 5 is a rear view of the attachment according to the embodiment of the present invention, and FIG. 5 is a perspective view showing a state in which the syringe is held by the attachment according to the embodiment of the present invention.

  As shown in FIGS. 1 to 4, a first recess 2, a flange receiving groove 3, and a second recess 4 are linearly connected in this order in the main body 1 of this attachment. The inner surface of the first recess 2 has a shape that matches the outer shape so that the outer shape of the cylinder of the first syringe that is arbitrarily selected can be securely held. The inner surface of the second recess 4 has a shape that matches the outer shape of the second syringe 4 so that the outer shape of the cylinder of the second syringe, which is arbitrarily selected, is different from that of the first syringe.

  The flange receiving groove 3 is formed so that the flanges of the cylinders of the first and second syringes are fitted together. Specifically, as shown in FIG. 4, the bottoms of the first recess 2 and the second recess 4 have the same height, and the flange receiving groove 3 is formed by attaching the first syringe and the second syringe by the attachment body 1. When held, the cylinders of these syringes are formed so as to come into contact with each other without floating from the bottoms of the first recess 2 and the second recess 4.

  FIG. 5 shows a state in which the first syringe 5 is held by the attachment body 1. As shown in FIG. 5, the attachment main body 1 holds the cylinder 6 of the first syringe 5 on the rear end side. Specifically, in the first syringe 5, a flange 7 provided on the rear end side of the cylinder 6 is fitted into the flange receiving groove 3, and the rear end side of the cylinder 6 is supported by the first recess 2. Although not shown, the second syringe is similarly held by the attachment body 1 with the cylinder flange fitted in the flange receiving groove 3 and the rear end side of the cylinder supported by the second recess 4. That is, the first syringe and the second syringe are fitted to the attachment body 1 with their directions reversed.

  Here, the syringe will be described by taking the first syringe 5 shown in FIG. 5 as an example. The syringe 5 includes a cylindrical cylinder 6 having a liquid injection port 8 at one end and an opening (not shown) at the other end, and a piston 9 movably inserted into the cylinder 6 from the opening at the other end of the cylinder 6. An anti-slip flange 7 is provided on the rear end side of the cylinder 6.

  According to this attachment, two types of syringes having different outer shapes can be reliably held. Therefore, the user of the syringe drive device only needs to prepare a smaller number of attachments than the type of the outer shape of the syringe to be used.

  Furthermore, in this embodiment, as shown in FIG. 2, the flange receiving groove 3 is formed from the center position of the attachment body 1 in the direction in which the first recessed portion 2, the flange receiving groove 3, and the second recessed portion 4 are connected. It is formed at an offset position. Specifically, the position of the flange receiving groove 3 is the distance from the center position of the attachment body 1 by a distance that is half the difference between the cylinder length of the first syringe 5 and the cylinder length of the second syringe 10. It is offset to the side of the recess where the shorter syringe fits. If it does in this way, as shown in FIG. 6, it will be fitted to the distance from the front-end | tip of the 1st syringe 5 fitted to the said 1st recessed part 2 side to the said center position, and the said 2nd recessed part 4 side. Further, the distance from the tip of the second syringe 10 to the center position becomes equal.

  Therefore, according to the attachment in this embodiment, even when two types of syringes having different outer shapes are held, the position of the tip of the injection needle attached to these syringes in the syringe drive device to which this attachment is attached Can be made constant. Therefore, even if various attachments prepared according to the outer shape of the syringe used by the user of the syringe drive device are attached, the injection needles attached to the plurality of syringes having different outer shapes held by them, respectively. The position of the tip can be made constant. Furthermore, since the position of the tip of the injection needle becomes constant, the workability of the suction and extrusion of the chemical solution can be improved.

  Then, the syringe drive device with which the attachment demonstrated above is mounted | worn is demonstrated. FIG. 7 is a perspective view showing a schematic configuration of the syringe drive device according to the embodiment of the present invention. FIG. 7 shows a state in which the attachment main body 1 is fitted to the fitting portion 11 in a state where a cylinder pressing portion and a piston restraining portion described later are removed. As shown in FIG. 7, the syringe drive device is provided with a fitting portion 11 into which the attachment main body 1 is fitted, and the user of this syringe drive device matches the outer shape of the syringe to be used. Various prepared attachments can be exchanged and installed.

  FIG. 8 is a perspective view showing a schematic configuration of the syringe drive device according to the embodiment of the present invention, and FIG. 9 is a plan view showing a schematic configuration of a main part near the syringe of the syringe drive device according to the embodiment of the present invention. is there. As shown in FIG. 8 and FIG. 9, the direction of the center axis of the cylinder and the horizontal holding state are secured with respect to the syringe drive device by the attachment fitted to the fitting portion 11.

  FIG. 10 is a perspective view showing a first state of the mechanism portion of the syringe drive device according to the embodiment of the present invention, and FIG. 11 is a perspective view showing a second state of the mechanism portion of the syringe drive device according to the embodiment of the present invention. FIG. 10 and 11 show the mechanism portion of the syringe drive device with a main body case and a cover portion to be described later removed. FIG. 11 shows an opening 12 formed at the other end of the cylinder 6.

  This syringe drive device drives the piston of the syringe held by the attachment main body 1 fitted to the fitting portion 11 in the central axis direction. Hereinafter, this syringe drive device will be described in detail with reference to FIGS. 7 to 11, taking as an example the case of driving the piston of the first syringe 5.

  As shown in FIGS. 7 and 8, the syringe drive device includes a main body case 13. A grip portion 14 is provided at the lower portion of the main body case 13. This syringe drive device is a portable type, and the user of the syringe drive device operates the operation buttons 15 and 16 with the tip of the index finger while holding the grip portion 14 in the manner of holding the handgun with the right hand, for example. . Further, fingers other than the thumb and forefinger are holding the syringe driving device by a finger placement surface 14 a provided on the gripping portion 14.

  Further, as shown in FIGS. 7 and 9, a cylinder holding portion 17 that holds the cylinder 6 is provided above the main body case 13. The cylinder holding part 17 has a semicircular recess whose upper surface is open. The bottom of the recess is the same height as the bottoms of the first recess 2 and the second recess 4 in a state where the attachment main body 1 is fitted to the fitting portion 11. As shown in FIGS. 8 to 11, the rear portion of the cylinder 6 is accommodated in the attachment body 1 and the cylinder holding portion 17 in a state where the attachment body 1 is fitted in the fitting portion 11.

  As shown in FIGS. 8 and 11, a cylinder pressing portion 18 is mounted on the upper surface of the cylinder 6. The cylinder pressing portion 18 is provided with a shaft 19 (see FIG. 11) on one end side 18a, and a spring (not shown) is disposed below the shaft 19, and the other end side 18b is It is a free end. The one end side 18a is once lifted against the pulling force of the spring, and the other end side 18b can be rotated 90 degrees counterclockwise in the lifted state. For this reason, when the attachment body 1 and the cylinder holding part 17 hold the cylinder 6, first, the one end side 18 a of the cylinder pressing part 18 is lifted once against the pulling force of the spring, and then the other end side 18 b is moved in that state. The upper surface of the cylinder holding part 17 is opened by rotating 90 degrees counterclockwise, and then the cylinder 6 is held by the attachment body 1 and the cylinder holding part 17. In this state, the other end side 18b of the cylinder pressing portion 18 is rotated 90 degrees clockwise, the cylinder 6 is pressed by the cylinder pressing portion 18, and the cylinder 6 is fixed. In this manner, the setting of the syringe 5 to the syringe drive device is completed.

  As shown in FIGS. 8 and 11, a lock claw 20 that engages with the other end side 18 b is provided on the other end side 18 b of the cylinder pressing portion 18. By engaging the lock claw 20 with 18, it is possible to prevent the cylinder pressing portion 18 from being inadvertently detached.

  As shown in FIG. 11, a flange 21 is provided at the rear end of the piston 9 inserted from the opening 12 into the cylinder 6, and the flange 21 is in contact with the piston operating rod 22. In order to constrain the piston 9 to the piston operating rod 22 in this state, a piston restricting portion 23 is provided on the opposite side of the piston operating rod 22 with the rod 21 interposed therebetween. That is, the flange 21 of the piston 9 to be inserted into the cylinder 6 held by the attachment body 1 and the cylinder holding portion 17 is disposed between the piston restraining portion 23 and the piston operating rod 22.

  Similarly to the cylinder pressing portion 18, the piston restraining portion 23 is provided with a shaft 24 at one end side 23a, and a spring (not shown) is disposed below the shaft 24, and the other end side 23b. Is a free end. The one end side 23a is once lifted against the pulling force of the spring, and in this state, the other end side 23b can be rotated 90 degrees clockwise. For this reason, when the piston 9 is restrained by the piston operating rod 22, first, the one end side 23a of the piston restraining portion 23 is once lifted against the pulling force of the spring, and then the other end side 23b is rotated 90 ° clockwise in that state. Rotate it. Thereafter, the cylinder 6 is held by the attachment body 1 and the cylinder holding portion 17, and then the flange 21 at the rear end of the piston 9 is brought into contact with the piston operating rod 22. The piston operating rod 22 is provided with a groove (not shown) for the flange 21 of the piston 9. By fitting the flange 21 in this groove, the direction of the central axis of the piston 9 and the horizontal holding state are ensured. It has come to be. In this state, the other end side 23b of the piston restraining portion 23 is rotated 90 degrees counterclockwise, the piston 9 is restrained by the piston restraining portion 23, and the setting of the piston 9 is completed.

  As shown in FIGS. 8 and 11, the other end side 23 b of the piston restraining portion 23 is provided with a lock claw 25 that engages with the other end side 23 b. By engaging the lock claw 25 with the piston 23, the restraint of the piston 9 by the piston restraining portion 23 is prevented from being inadvertently released.

  As shown in FIG. 11, the piston operating rod 22 extends on both sides orthogonal to the central axis direction of the piston 9, and is coupled to the rear ends of the cylindrical racks 26 and 27 at both ends. Intermediate portions of these racks 26 and 27 are pivotally supported by shaft portions 28 and 29. Further, as shown in FIGS. 7 to 10, retaining portions 30 and 31 are attached to the front ends of the racks 26 and 27. These racks 26 and 27 are movable in the central axis direction of the set piston 9, that is, in the central axis direction of the set cylinder 6.

  As shown in FIG. 10, a notch 32 is provided below the shaft portion 28. Although not shown, a notch is similarly provided below the shaft portion 29. From these cutouts, teeth 33 and 34 provided on the lower sides of the racks 26 and 27 are exposed downward. Gears (pinions) 35 and 36 provided below the respective notches are engaged with the teeth 33 and 34, respectively. The gears 35 and 36 are provided with gears 37 provided below them. , 38 are engaged with each other. A gear 39 is also provided between the gears 37 and 38, and these gears 37 to 39 are fixed to a single shaft 40 that is supported by left and right bearings 41 and 42. Therefore, these gears 37 to 39 rotate integrally. A worm gear 43 is engaged with the gear 39, and a motor 44 is coupled to the worm gear 43.

  In this syringe drive device, when the operation button 15 is operated, the motor 44 rotates forward, and the racks 26 and 27 and the piston operating rod 22 drive the piston 9 in the direction indicated by the arrow 45 shown in FIG. On the other hand, when the operation button 16 is operated, the motor 44 is reversed, and the racks 26 and 27 and the piston operating rod 22 drive the piston 9 in the direction indicated by the arrow 46 shown in FIG.

  Subsequently, the operation of the syringe drive device when the drug is prepared or when the prepared drug is filled into an infusion bag or the like will be described. When a medicine is prepared, an injection needle 47 is attached to the liquid injection port 8 of the cylinder 6 as shown in FIG.

  First, the case where a medicine is prepared will be described. In this case, the user of the syringe drive device first inserts the injection needle 47 into the medicine bottle with the right hand holding the grip 14 and holding the medicine bottle with the left hand. In this state, the operation button 15 is operated. By this operation, the motor 44 rotates in the forward direction, whereby the gears 37, 38, and 39 rotate counterclockwise in FIG. 10, thereby rotating the gears 35 and 36 in the clockwise direction. Then, the left and right racks 26 and 27 move backward (in the direction indicated by the arrow 45 shown in FIG. 8) from the state shown in FIG. 10 to the state shown in FIG.

  A piston operating rod 22 is coupled to the rear ends of the racks 26 and 27, and the piston 9 is restrained by the piston operating rod 22 and the piston restraining portion 23. Therefore, when the left and right racks 26 and 27 move rearward from the state shown in FIG. 10 to the state shown in FIG. 11, the piston 9 is pushed by the groove for the piston restraining portion 23 or the flange 21, and the piston 9 moves outwardly from the cylinder 6 ( (Direction indicated by the arrow 45 shown in FIG. 8). Thereby, the medicine can be sucked into the cylinder 6 from the inside of the medicine bottle into which the injection needle 47 provided in the liquid injection port 8 is inserted.

  In order to suck the next medicine into the cylinder 6, the operation of the operation button 15 is stopped, the rotation of the motor 44 is stopped, the suction operation is stopped, the medicine bottle is replaced, and the suction operation is similarly performed. In this way, a plurality of types of drugs are sucked into the cylinder 6, whereby the drugs are prepared in the cylinder 6.

  Then, the case where the medicine after mixing is filled in an infusion bag or the like will be described. When the preparation of the medicine is completed, this time, the operation button 16 is operated with the index finger of the right hand holding the grip 14. Then, the motor 44 is reversed, whereby the gears 37, 38, 39 are rotated in the clockwise direction in FIG. 10, and thereby the gears 35, 36 are rotated in the counterclockwise direction. Then, the left and right racks 26 and 27 move forward (the direction indicated by the arrow 46 shown in FIG. 8) from the state shown in FIG. 11 to the state shown in FIG.

  Thus, when the left and right racks 26 and 27 move forward from the state shown in FIG. 11 to the state shown in FIG. 10, the piston 9 is pushed into the cylinder 6 by being pushed by the piston operating rod 22. Thereby, a chemical | medical agent is extruded from the cylinder 6 to an infusion bag, for example.

  As understood from the above description of the operation, in this embodiment, when the piston 9 is pulled out or pushed in from the cylinder 6, power is transmitted from the piston operating rod 22 and the piston restraining portion 23 to the rod 21 of the piston 9. . This power is supplied by the racks 26 and 27 from the left and right of the central axis of the piston 9. In other words, the output of the motor 44 is transmitted from the worm gear 43 to the gear 39 and distributed to the gears 37 and 38 integrally formed via the shaft 40. The forces distributed to the gears 37 and 38 are transmitted to the racks 26 and 27 via the gears 35 and 36, respectively. The force transmitted to the racks 26 and 27 located on the left and right of the central axis of the piston 9 becomes a force for driving the piston 9 via the piston operating rod 22 and the piston restraining portion 23.

  As described above, the driving force transmission system that is substantially symmetrical with respect to the central axis of the piston 9 is configured. The working moment load can be suppressed. As a result, it is not necessary for each member constituting the driving force transmission system to withstand a large moment load. Therefore, the drive part of piston 9 can be reduced in size and weight, and also the syringe drive apparatus can be reduced in size and weight. Specifically, the left and right racks 26 and 27 can be made of, for example, aluminum having a small diameter, and the gears 35 to 39 can be made of, for example, synthetic resin. Therefore, the syringe drive device can be a portable type that can be easily held and operated with one hand as described above.

  In addition, in connection with the portable type with one hand, the syringe drive device according to this embodiment is configured with sufficient consideration for the safety of the user. Hereinafter, the safety of the syringe drive device according to this embodiment will be described.

  A cover portion 48 that protrudes outward is provided below the shaft portion 28 as shown in FIGS. Although not shown, a cover portion protruding outward is similarly provided below the shaft portion 29. In the pair of left and right cover portions, teeth 33 and 34 of racks 26 and 27 and gears 35 to 39 that are exposed from the notches of the shaft portions 28 and 29 are housed. As a result, the hand that grips the grip 14 does not touch these movable parts (the teeth 33 and 34 of the racks 26 and 27 and the gears 35 to 39), and the safety of the user of the syringe drive device is high. Become. Further, since the motor 44 and the worm gear 43 are also covered with the cover portion 49 as shown in FIGS. 7 and 8, the safety of the user of the syringe drive device is increased. In this embodiment, since these cover portions are integrally formed with the main body case 13, the number of components is not increased, and the size and weight can be reduced.

  In this embodiment, the piston 9 is driven in the direction of sucking the chemical into the cylinder 6 by pressing the operation button 15 and driven in the direction of pushing out the chemical in the cylinder 6 by pressing the operation button 16. . In this case, it is preferable to know which operation button is touched with the touch of a finger when the button is touched. In particular, the operation button 16 gives a drive instruction in the direction of pushing out the chemical liquid in the cylinder 6, and it is necessary to avoid as much as possible the risk of leaking the chemical liquid by an erroneous operation. In this embodiment, as shown in FIGS. 7 and 8, the height of the operation button 16 is made lower than that of the operation button 15 to alert the user of the syringe drive device. In addition to making the heights of the two operation buttons different in this way, for example, the shapes of the two operation buttons may be made different. Specifically, for example, the operation button 15 may have a convex shape, and the operation button 16 may have a concave shape. Further, for example, an enable button is provided separately from the operation buttons 15 and 16, and the driving in the direction of pushing out the chemical liquid in the cylinder 6 is executed only by double pressing the enable button and the operation button 16. May be.

  Further, it is possible to provide a volume adjusting unit that can adjust each driving speed or driving force with respect to driving in the direction of sucking the chemical into the cylinder 6 and driving in the direction of pushing out the chemical in the cylinder 6. In particular, regarding the driving in the direction of sucking the chemical into the cylinder 6, since a specified amount of the chemical is aspirated, a volume adjustment unit capable of adjusting the driving speed or driving force is provided in the syringe driving device. Is desirable.

  In this embodiment, the output of the motor 44 is transmitted to the shaft 40 by the worm gear 43 and the gear 39 and distributed to the gears 37 and 38 integrally formed with the shaft 40, and is racked via the gears 35 and 36. However, the present invention is not limited to this configuration. For example, the worm gear 43 and the gear 39 may be bevel gears, the gears 35 and 36 may be omitted, and the gears 37 and 38 may be configured with large diameters and directly meshed with the rack 26 and the rack 27. Also good.

  The attachment according to the present invention can reliably hold two types of syringes having different outer shapes. Therefore, the attachment and syringe drive device according to the present invention can suppress the number of attachments to be prepared, and is an apparatus that supports the operation of a syringe used for preparing a drug for infusion in a hospital or the like. Useful.

DESCRIPTION OF SYMBOLS 1 Attachment main body 2 1st recessed part 3 Flange receiving groove 4 2nd recessed part 5 1st syringe 6 Cylinder 7 Cylinder flange 8 Cylinder injection port 9 Piston 10 2nd syringe 11 Fitting part 12 Cylinder opening 13 Main body case 14 Grasping hand part 14a Finger rest surface 15, 16 Operation button 17 Cylinder holding part 18 Cylinder pressing part 18a One end side of cylinder pressing part 18b Other end side of cylinder pressing part 19 Axis 20 Locking claw 21 Piston rod 22 Piston operation桿 23 Piston restraint portion 23a One end side of the piston restraint portion 23b Other end side of the piston restraint portion 24 Shaft 25 Lock claw 26, 27 Rack 28, 29 Shaft portion 30, 31 Detachment portion 32 Notch 33, 34 Teeth 35-39 Gear 40 shaft 41, 42 bearing 43 worm Ya 44 motor 47 needle 48 and 49 cover

Claims (3)

  An attachment mounted on a syringe drive device for driving the piston of a syringe comprising a cylinder provided with a flange on the rear end side, and a piston movably inserted into the cylinder, the attachment body A first recess into which a cylinder of the first syringe fits, a second recess into which a cylinder of a second syringe having an outer shape different from that of the first syringe, and the first and second syringes The flange receiving groove into which the flanges of the cylinders are commonly fitted is formed by connecting the first recess, the flange receiving groove, and the second recess in this order.   In the direction in which the first recess, the flange receiving groove, and the second recess are connected from the tip of the first syringe in which a flange is fitted in the flange receiving groove and the cylinder is supported by the first recess. A position at which the distance to the center position of the attachment body is equal to the distance from the tip of the second syringe to which the flange is fitted in the flange receiving groove and the cylinder is supported by the second recess to the center position. The attachment according to claim 1, wherein the flange receiving groove is formed in the attachment.   The fitting part by which the attachment in any one of Claim 1 or 2 is fitted is provided, The piston of the syringe which the said attachment fitted to the said fitting part hold | maintains is driven, It is characterized by the above-mentioned. Syringe drive device.

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