JP2010233787A - Syringe driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe driving device having a reduced size. <P>SOLUTION: The syringe driving device includes a cylinder holding part 7 for holding a cylinder 6 of a syringe 5, and a piston driving portion for driving a piston 10 in the axis direction with respect to the cylinder 6 held by the cylinder hold part 7. The piston driving portion has racks 20 and 21 for driving the piston 10 in the axis direction, on both sides orthogonal to the axis direction of the piston 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a syringe drive device for driving a syringe.

  Conventionally, when infusion medicines are prepared in hospitals, for example, a plurality of bottled medicines are extracted by a syringe and the medicines are mixed in the syringe.

  And the medicine after this preparation is pushed out from a syringe next, for example, is filled in a drip 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 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 into the drip bag, 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 the drip bag, it is interposed in the extrusion path. The piston must be pushed against the positive pressure generated by the filter. At this time, the reaction force due to the negative pressure and the positive pressure is as large as several tens of N.

  In general, drug preparation is performed by holding a drug bottle or drip bag with one hand and holding a syringe with the other hand. Further, depending on the situation, it is carried out while appropriately maintaining the relative posture relationship between the medicine bottle or the infusion bag and the syringe. That is, it is very troublesome because it is necessary to alternately pull out and push in the piston while holding the posture of the syringe with one hand and withstanding a reaction force of several tens of N.

  On the other hand, as a device that supports syringe operation, a syringe drive device has been proposed for the purpose of constant flow injection of a drug into the human body.

  The block diagram of the conventional syringe drive device is shown in FIG.

As this syringe drive device, a cylinder holding part 63 for holding a cylinder (outer cylinder) 62 of a syringe 61 and a piston (absorber) 64 for a cylinder (outer cylinder) 62 held by the cylinder holding part 63. The piston driving unit (slider) 65 that drives in the axial direction is provided. When the feed screw 68 is driven by the motor, the driven member 67 that engages with the feed screw 68 moves linearly. The piston driving part (slider) 65 is connected to a driven member 67 via a connecting member 66, and drives the piston 64 in accordance with the movement of the driven member 67 (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-42213

  However, in the conventional syringe drive device, there is one drive transmission system for driving the piston, and the piston drive unit applies a driving force to push or pull the piston to the piston at one point directly behind the piston. It has a cantilever structure to convey. Therefore, a so-called unidirectional moment load is applied to the portion that transmits this driving force. As described above, since the force for driving the piston is as large as several tens of N, the one-way moment load applied to the portion that transmits the driving force is extremely large.

  Further, in the conventional syringe drive device, a feed screw constituting a drive transmission system for driving the piston, a driven member engaged with the screw, a piston drive unit connected to the driven member via a connecting member, etc. Has a large strength (thickness) enough to withstand a large unidirectional moment load, and as a result, the syringe drive device is enlarged.

  Then, an object of this invention is to provide the syringe drive device for solving the above-mentioned subject.

  In order to achieve the above object, a syringe driving device according to the present invention is a syringe driving device for driving a syringe composed of a cylinder and a piston, the cylinder holding portion holding the cylinder, and the cylinder holding portion. A piston drive unit that drives a piston inserted in a cylinder held by the cylinder in an axial direction thereof, and both sides of the piston drive unit in a direction orthogonal to the central axis of the held cylinder are first and second It is engaged with the drive means.

  As described above, according to the present invention, it is possible to provide a syringe drive device that does not generate a large one-way moment load and can be miniaturized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals and description thereof is omitted.

(Embodiment 1)
1 is a perspective view of a syringe drive device according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a first form of a mechanism portion of the syringe drive device according to Embodiment 1. FIG. These are perspective views which show the 2nd form of the mechanism part of the syringe drive device in Embodiment 1, and FIG. 4 is a figure which shows the syringe drive device seen from the direction of A of FIG.

  2 and 3 are views showing the mechanism portion of the syringe drive device 100 with the main body cover 1 and the cover portion 38 removed. In these drawings, the main body cover 1 and the cover portion 38 are removed. Explained in the state.

  In FIG. 1, the syringe drive device 100 includes a main body case 1 and a grip portion 2 provided at a lower portion of the main body case 1.

  In this Embodiment 1, this syringe drive device 100 is a portable type, and with the tip of the index finger turned to the other side in FIG. The operation buttons 3 and 4 are operated.

  Further, as shown in FIG. 2, a cylinder holding portion 7 that holds the cylinder 6 of the syringe 5 is provided above the main body case 1.

  As can be understood from FIG. 3, the syringe 5 includes a cylindrical cylinder 6 having a liquid injection port 8 at one end and an opening 9 at the other end, and the inside of the cylinder 6 from the opening 9 at the other end of the cylinder 6. And the piston 10 inserted into the.

  As can be understood from FIG. 4, the cylinder holding portion 7 that holds the cylinder 6 is formed by a semicircular recess having an open upper surface. The retainer 11 is mounted on the upper surface of the cylinder 6 in a state where the rear portion of the cylinder 6 (the opening 9 side of the other end) is accommodated in the cylinder holding portion 7 as shown in FIGS. It has become.

  A shaft 12 is provided on one end side of the presser 11, and a spring (not shown) is disposed below the shaft 12, and the other end side is a free end. And one end side (axis 12 side) is once lifted against the pulling force of the spring, and the other end side (free end) can be rotated 90 degrees counterclockwise in the lifted state. .

  For this reason, when the cylinder holding part 7 holds the cylinder 6, first, the one end side of the presser 11 is lifted once against the pulling force of the spring, and then the other end side (the free end) is turned in that state. By rotating 90 degrees clockwise, the upper surface of the cylinder holding part 7 is opened, and then the cylinder 6 is held by the cylinder holding part 7.

  In this state, the other end side (free end) of the presser 11 is rotated 90 degrees clockwise, and the cylinder 6 is pressed by the presser 11 as shown in FIGS. 1 and 3, and the cylinder 6 is fixed. To do. Thus, the setting of the cylinder 6 to the syringe drive device 100 is completed.

  Since the lock claw 13 shown in FIG. 1 is provided on the other end side (free end) of the presser 11, the lock claw 13 is engaged with the presser 11 after the setting of the cylinder 6 is completed. This prevents the cylinder 6 from being fixed by the presser 11 unintentionally. The lock claw 13 is configured such that the height of the lock claw 13 is shifted from that of the presser 11 so that the lock claw 13 is higher than the presser 11. By adopting such a configuration, even when the lock claw 13 is engaged with the presser 11, the lock claw 13 can be easily pinched and operated easily.

  Since a non-slip flange 14 is provided at the rear end (opening 9 side) of the cylinder 6, a groove (not shown) in which the flange 14 is fitted is provided in the cylinder holding portion 7. Yes. Therefore, as shown in FIGS. 1 and 3, even when the cylinder 6 is set in the cylinder holding portion 7, the position of the flange 14 is defined by the groove, so that the direction of the center axis of the cylinder 6 and the horizontal holding state are ensured. It has come to be.

  As shown in FIG. 3, a flange 15 is provided at the rear end of the piston 10 inserted from the opening 9 into the cylinder 6 (the outer portion of the cylinder 6). Yes. In this state, in order to restrain the piston 10 to the piston operating rod 16 portion, a piston restricting portion 17 is provided on the opposite side of the piston operating rod 16 with the rod 15 interposed therebetween as shown in FIG.

  As with the presser 11, the piston restraining portion 17 is also provided with a shaft 18 at one end thereof, and a spring (not shown) is disposed below the shaft 18, and the other end is a free end. It has become. Then, one end side (shaft 18 side) is once lifted against the pulling force of the spring, and in this state, the other end side (free end) can be rotated 90 degrees clockwise in FIG. ing.

  Therefore, when the piston 10 is restrained by the piston operating rod 16, first, one end side (the shaft 18 side) of the piston restraining portion 17 is once lifted against the pulling force of the spring, and then in that state, the other end side ( The free end) is rotated 90 degrees clockwise to open the upper surface of the piston 10, and then the rod 15 at the rear end of the piston 10 is brought into contact with the piston operating rod 16. The piston operating rod 16 is provided with a groove (not shown) for the flange 15 of the piston 10. By fitting the flange 15 into this groove, the direction of the central axis of the piston 10 and the horizontal holding state are ensured. It has come to be.

  Then, in this state, the other end side (free end) of the piston restraining portion 17 is rotated 90 degrees counterclockwise, and the piston 10 is restrained by the piston restraining portion 17 as shown in FIGS. The setting of the piston 10 is completed.

  A lock claw 19 shown in FIG. 3 is provided on the other end side (free end) of the piston restraining portion 17. Therefore, after the setting of the piston 10 is completed, the lock claw 19 is engaged with the piston restraining portion 17, thereby preventing the piston 10 from being restrained unintentionally by the piston restraining portion 17. The lock claw 19 is configured such that the height of the lock claw 19 is shifted from that of the piston restricting portion 17 so that the lock claw 19 is higher than the piston restricting portion 17. With such a configuration, even when the lock claw 19 is engaged with the piston restraining portion 17, the lock claw 19 can be easily pinched and operated easily.

  Now, as shown in FIG. 3, the piston operating rod 16 extends on both sides orthogonal to the central axis direction of the piston 10, and is coupled to the rear ends of the cylindrical racks 20 and 21 at both ends.

  Intermediate portions of these racks 20 and 21 are pivotally supported by shaft portions 22 and 23 provided on both sides of the cylinder holding portion 7. Further, as shown in FIG. 2, stoppers 24 and 25 are attached to the front ends of the racks 20 and 21 (opposite the rear end coupled to the piston operating rod 16).

  Notches 26a and 26b are respectively provided below the shaft portions 22 and 23, and teeth 27a and 27b provided on the lower sides of the racks 20 and 21 at the notches 26a and 26b are exposed downward. Yes.

  Further, gears (pinions) 28 and 29 are provided below the notches 26a and 26b of the shaft portions 22 and 23, and these gears 28 and 29 are notched portions 26a and 26b of the shaft portions 22 and 23. Thus, the racks 20 and 21 are engaged with the teeth 27a and 27b.

  Further, gears 30 and 31 are engaged with the gears 28 and 29 below, and the gears 30 and 31 and a gear 32 provided therebetween are configured to rotate integrally.

  That is, the gears 30, 31, and 32 are fixed to a single shaft 33, and the shaft 33 is pivotally supported by the left and right bearings 34 and 35. Therefore, the gears 30, 31, and 32 rotate together. Is configured to do.

  In this state, a worm gear 36 is engaged with the gear 32, and a motor 37 is coupled to the worm gear 36.

  In the first embodiment, the operator presses the operation button 3 with the tip of the index finger turned to the other side in FIG. 1 in the state where the hand grip 2 shown in FIG. Then, the motor 37 rotates forward, and the racks 20 and 21 and the piston operating rod 16 are driven in the direction 102 in FIG. Accordingly, the state shown in FIG. 2 is changed to the state shown in FIG. 3, and the medicine can be sucked into the cylinder 6 from the inside of the medicine bottle into which the injection needle (not shown) provided in the liquid injection port 8 is inserted. I can do it.

  This operation will be specifically described. Although not shown in FIGS. 1 to 4, an injection needle (not shown) is attached to the liquid injection port 8. The user of the syringe drive device 100 of the first embodiment first inserts an injection needle (not shown) into the medicine bottle while holding the hand grip 2 with the right hand and holding the medicine bottle with the left hand. It will be in the state.

  When the operation button 3 is operated in this state, the motor 37 rotates in the forward direction, whereby the gears 30, 31, and 32 are rotated in the counterclockwise direction in FIG. 2, whereby the gears 28 and 29 are rotated in the clockwise direction. To do. Then, the left and right racks 20 and 21 are moved backward (direction 102 in FIG. 1) from the state in FIG. 2 to the state in FIG.

  As shown in FIG. 3, the piston operating rod 16 is coupled to the rear ends of the racks 20 and 21, and the piston 10 is restrained by the piston operating rod 16 and the piston restraining portion 17. Therefore, when the left and right racks 20 and 21 move rearward (direction 102 in FIG. 1) from the state shown in FIG. 2 to the state shown in FIG. 6 is pulled out in the outward direction (direction 102 in FIG. 1), so that the medicine can be sucked into the cylinder 6 from the inside of the medicine bottle.

  In order to suck the next medicine into the cylinder 6, the operation of the operation button 3 is stopped, the rotation of the motor 37 is stopped, the suction action is stopped, the medicine bottle is replaced, and the suction action is similarly performed. Make it.

  Then, a plurality of kinds of medicines are sucked into the cylinder 6 in this way, so that the medicine is prepared in the cylinder 6.

  In this way, when the suction and blending of the medicine is completed, when the operation button 4 is operated with the index finger of the right hand holding the grip part 2 this time, the motor 37 is reversed, so that the gears 30, 31, and 32 are shown in FIG. 2 rotates clockwise, thereby causing gears 28 and 29 to rotate counterclockwise. Then, the left and right racks 20 and 21 move forward (direction 103 in FIG. 1) from the state of FIG. 3 to the state of FIG.

  When the left and right racks 20 and 21 are moved forward (direction 103 in FIG. 1) from the state of FIG. 2 to the state of FIG. 2 in this way, the piston 10 is pushed into the cylinder 6 by the piston operating rod 16. In this way, the drug is pushed out of the cylinder 6 into, for example, an infusion bag.

  As can be understood from the above description of the operation, in the first embodiment, when the piston 10 is pulled out or pushed into the cylinder 6, the piston operating rod 16 and the piston restraining portion 17 are moved from the piston operating rod 16 to the piston restricting portion 17. Transmit power. The power is supplied by the racks 20 and 21 from the left and right of the central axis of the piston 10. In other words, the output of the motor 37 is transmitted from the worm gear 36 to the gear 32 and distributed to the gears 30 and 31 formed integrally through the shaft 33. The forces distributed to the gears 30 and 31 are transmitted to the racks 21 and 20 via gears 28 and 29, respectively. The force transmitted to the racks 21 and 20 located on the left and right of the central axis of the piston 10 becomes a force for driving the piston 10 via the piston operating rod 16 and the piston restraining portion 17.

  As described above, since the driving force transmission system that is substantially symmetric with respect to the central axis of the piston 10 is configured, the moment load acting on the driving portion (piston operating rod 16 and piston restraining portion 17) of the piston 10 is canceled out. . As a result, the transmission system that drives the piston 10 does not need to withstand a large moment load. Furthermore, this makes it possible to achieve a reduction in size and weight of the syringe drive device 100 itself.

  Specifically, the left and right racks 20 and 21 can be made of aluminum with a small diameter, and the gears 28 to 32 can be made of synthetic resin. As a result, the drive unit and the overall configuration can be reduced in size and weight as the overall configuration.

  For this reason, the syringe drive device 100 of the first embodiment can be a portable type that can be easily held and operated with one hand as described above.

  For this reason, the medicine blending operation using the syringe drive device 100 according to the first embodiment can be easily performed not only in the dispensing chamber but also in an appropriate place (for example, a nurse station). It is possible to improve efficiency.

  Further, in connection with the portable type with one hand, the syringe drive device 100 according to the first embodiment is configured with sufficient consideration for the safety of the user.

  Hereinafter, the safety of the syringe drive device 100 according to the first embodiment will be described.

  As shown in FIG. 1, cover portions 38a and 38b projecting outward are provided on both sides of the cylinder holding portion 7 above the grip portion 2, and notches 26a and 26b are provided in the cover portions 38a and 38b. The teeth 27a and 27b of the racks 20 and 21 and the gears 28 to 31 that are exposed in the portion are accommodated. Since it is housed in the cover portions 38a and 38b in this way, the hand gripping the grip portion 2 does not touch these movable portions (the gears 28 to 31 etc.), and the user of the syringe drive device 100 The safety will be higher.

  Further, as shown in FIG. 1, the cover portions 38a and 38b protrude from both sides (outside) of the cylinder holding portion 7. Due to the presence of the cover portion 38, neither the thumb nor the index finger of the hand holding the grip portion 2 touches the teeth 27a and 27b of the racks 20 and 21 that are exposed downward as shown in FIG. This also increases the safety of the user of the syringe drive device 100.

  Since the motor 37 and the worm gear 36 are also covered with the cover 39 as shown in FIG. 1, the safety of the user of the syringe drive device 100 is high. In the first embodiment, since these cover portions 38 and 39 are formed integrally with the main body case 1, the number of components is not increased, and this also enables reduction in size and weight. It can be done.

  Furthermore, a rack end cover 101 is provided on the piston operating rod 16 provided so as to couple both racks to the ends of the racks 20 and 21, as shown in FIG. The rack end cover 101 has an arcuate curved surface that protrudes rearward. Thereby, even if it is going to place an apparatus main body on a desk etc. by making the front end side of the syringe 5 into the upper side, it rotates to either right or left. That is, the syringe drive device 100 main body is not placed in a state where the injection needle attached to the liquid injection port 8 of the syringe 5 faces upward. Thus, by devising the shape of the syringe drive device 100, the work safety of the user is ensured. In the first embodiment, the example in which the rack end cover 101 is provided as a separate member on the piston operating rod 16 has been described. However, these may be integrally formed.

  In the first embodiment, the piston 10 is driven in the direction in which the chemical liquid is sucked into the cylinder 6 by pressing the operation button 3, and is driven in the direction in which the chemical liquid in the cylinder 6 is pushed out by pressing the operation button 4. However, the shapes of the two operation buttons are different so that the user can recognize the difference between the two buttons by touching the buttons. For example, the operation button 3 has a convex shape, and the operation button 4 has a concave shape. In addition, the same effect can be obtained by changing the height of both operation buttons. In particular, the operation button 4 gives a drive instruction in the direction of pushing out the chemical solution in the cylinder 6, and it is necessary to avoid as much as possible the risk of leaking the chemical solution by an erroneous operation. Therefore, it is desirable that the height is made lower than that of the operation button 3 so as to call attention. Alternatively, an enable button (not shown) may be provided, and the drive in the direction of pushing out the chemical solution in the cylinder 6 may be operated only by double pressing the enable button and the operation button 4.

  It should be noted that a volume adjusting unit (not shown) that can adjust each driving speed or driving force can be provided for 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, with respect to driving in the direction in which the chemical solution is sucked into the cylinder 6, a specified amount of the chemical solution is suctioned, and thus a volume adjustment unit capable of adjusting the driving speed or driving force is provided on the syringe driving device 100 main body. It is desirable that

  In the first embodiment, the output of the motor 37 is transmitted to the shaft 33 by the worm gear 36 and the gear 32 and distributed to the gears 30 and 31 integrally formed with the shaft 33, and the gears 28 and 29 are used. Although the information is transmitted to the racks 21 and 20, it is not limited to this configuration. For example, the worm gear 36 and the gear 32 may be bevel gears, the gears 28 and 29 may be omitted, and the gears 30 and 31 may be configured with large diameters and directly meshed with the racks 21 and 20. .

(Embodiment 2)
Next, air venting from the cylinder 6 will be described.

  That is, when a medicine is sucked into the cylinder 6 from the medicine bottle, air may be sucked into the cylinder 6 together from the medicine bottle. At that time (at the time of air suction), the next medicine suction is performed. It is necessary to let air flow out from the cylinder 6 before or when the medicine is delivered to the drip bag.

  Prior to this description, the liquid injection port 8 formed at one end of the cylinder 6 is provided at a position eccentric from the central axis, as is apparent from each drawing. Specifically, as shown in FIGS. 1 to 4, when a drug is sucked from the medicine bottle into the cylinder 6, the liquid injection port 8 exists below the center.

  In this state, since the scale 40 is present on the upper surface of the cylinder 6 as shown in FIG. 1, the suction amount is adjusted while looking at the scale 40 during the drug suction.

  However, when the injection port 8 is present below the center in this way and the piston 10 is sent forward (direction 103 in FIG. 1) to release air, the medicine flows out before the air. Therefore, at this time, the cylinder 6 is rotated 180 degrees from the state shown in FIG. 4, so that the liquid injection port 8 exists above the center as shown by the broken line in FIG. 4.

  Therefore, in the second embodiment, as shown in FIG. 4, rotatable rollers 41 and 42 are provided at two positions on the left and right in the circumferential direction below the cylinder holding portion 7, and the lower surface of the presser 11 is further provided. Also, a rotatable roller 43 is provided. Thereby, in the cylinder holding part 7, the outer periphery of the cylinder 6 is rotatably held by the rollers 41, 42, and 43 at three positions.

  Therefore, if the outer periphery of the cylinder 6 is held by the rollers 41, 42, 43 and the cylinder 6 is rotated 180 degrees from the state of FIG. 4, the liquid injection port 8 may be present above the center. I can do it.

  At this time, the cylinder 6 can be rotated without releasing the holding of the cylinder 6 by the presser 11 and while the cylinder 6 is being held by the cylinder holding part 7 and the presser 11. Therefore, pre-preparation work (turning of the cylinder 6) before the air venting work can be easily performed, and the workability is very good.

  In this state, if the piston 10 is sent forward to vent the air, the air located in the upper portion of the cylinder 6 can be smoothly discharged out of the cylinder 6 through the liquid injection port 8. Since the liquid injection port 8 is in the upper position as described above, the medicine stored in the lower portion of the cylinder 6 according to gravity does not inadvertently flow out of the cylinder 6 when the air is released.

  If the cylinder 6 is rotated 180 degrees again to the state shown in FIG. 4 after the air venting is completed, the liquid injection port 8 can be located below the center.

  Also at this time, the cylinder 6 is easily rotated without releasing the holding of the cylinder 6 by the presser 11 and with the cylinder holding part 7 and the presser 11 being held. It can be very easy to work with.

  When the cylinder 6 is rotated, the flange 14 provided on the outer periphery of the opening 9 at the other end of the cylinder 6 is also rotated. Therefore, a groove (not shown) in the cylinder holding portion in which the flange 14 is fitted is provided. A sufficient depth is required so as not to hinder the rotation of the flange 14.

  In addition, it is desirable that the piston 10 is restrained by the piston operating rod 16 and the piston restraining portion 17 so as to be rotatable around the central axis of the piston 10. Thereby, since the piston 10 can also be rotated substantially integrally with the rotation of the cylinder 6, it is possible to prevent rotational sliding at the contact portion with the piston 10 in the cylinder 6.

(Embodiment 3)
In the second embodiment, the cylinder 6 is rotated while directly touching the outer periphery. However, as in the third embodiment of the present invention shown in FIG. You may go.

  Specifically, in the third embodiment, a gear 45 is mounted and fixed near the flange 14 on the outer periphery of the cylinder 6, and the operating rod 44 is slidably attached to the presser 11. Then, by operating the operating rod 44, the teeth 46 of the operating rod 44 and the gear 45 may be engaged, thereby rotating the cylinder 6.

  As still another embodiment of the present invention, the flange 14 provided in the opening 9 of the cylinder 6 may be circular and the gear 45 may be provided.

  In this case, instead of the rotation operation by the operation rod 44 of FIG. 5, the cylinder rotation operation for engaging with the gear 45 of the flange 14 provided in the opening 9 portion of the cylinder 6 in the vicinity of the cylinder holding portion 7. An operating rod (not shown) will be provided.

  In any of the above-described embodiments, the flange 14 may be provided with a gear 45, and the cylinder holding portion 7 may be provided with a locking means (not shown) for preventing cylinder rotation.

  In other words, in each embodiment of the present invention, even when the cylinder 6 is held by the cylinder holding portion 7, the cylinder 6 can be turned freely to be highly convenient. In order to prevent the rotation, the cylinder holding portion 7 is provided with a lock means (not shown) for preventing the rotation of the cylinder.

  According to the present invention, it is possible to obtain a miniaturized portable syringe drive device, which is held at one place with one hand and the other with a medicine bottle, and thus with both hands, the preparation of the medicine The work can be easily performed, and as a result, the mixing work can be made efficient.

  Therefore, it is highly expected to be used in hospitals.

The perspective view of the syringe drive device in Embodiment 1. The perspective view which shows the 1st form of the mechanism part of the syringe drive device in Embodiment 1. FIG. The perspective view which shows the 2nd form of the mechanism part of the syringe drive device in Embodiment 1. FIG. The figure which shows the syringe drive device seen from the direction of A of FIG. The figure which shows the principal part of the syringe rotation mechanism in Embodiment 3. Configuration diagram of conventional syringe drive device

DESCRIPTION OF SYMBOLS 1 Main body case 2 Grip hand part 3, 4 Operation button 5 Syringe 6 Cylinder 7 Cylinder holding part 8 Injection port 9 Opening 10 Piston 11 Holding tool 12 Axis 13, 19 Lock claw 14 Flange 15 鍔 16 Piston operation rod 17 Piston restraint part 18 shaft 20, 21 rack 22, 23 shaft portion 24, 25 retaining 26a, 26b notch 27a, 27b tooth 28, 29, 30, 31, 32 gear 33 shaft 34, 35 bearing 36 worm gear 37 motor 38, 39 cover portion 40 Scale 41, 42, 43 Roller 44 Operation rod 45 Gear 46 Teeth

Claims (6)

A syringe drive device for driving a syringe composed of a cylinder and a piston,
A cylinder holding part for holding the cylinder;
A piston drive unit that drives a piston inserted in a cylinder held by the cylinder holding unit in the axial direction thereof,
The syringe drive device is characterized in that the piston drive unit is engaged with first and second drive means on both sides in a direction orthogonal to the central axis of the cylinder to be held. The cylinder holding portion includes a cylinder pressing tool and a lock mechanism,
The syringe drive device according to claim 1, wherein the piston drive unit is a piston operating rod provided with a piston restraining unit and a lock mechanism thereof. The syringe drive device according to claim 2, wherein a piston rod inserted into the cylinder held by the cylinder holding portion is disposed between the piston restraining portion and the piston operating rod. The first and second driving means are each configured by a rack movable in a direction of a central axis of a cylinder held by the cylinder holding portion, and a pinion screwed into the rack. The syringe drive device according to any one of 1 to 3. A grip is provided below the cylinder holder,
The syringe drive device according to claim 4, wherein a cover portion in which the pinion is stored is provided on both sides of the cylinder holding portion. The syringe drive device according to any one of claims 2 to 5, wherein a convex arc-shaped cover is provided on the piston operating rod.

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