JPH042069B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a syringe biasing device that allows a liquid medicine in a syringe to be injected into a patient.

[Prior Art] Conventionally, when treating a patient, in order to continuously administer anticancer drugs and various antibiotics to the patient in small amounts over a long period of time, for example, Japanese Patent Application Laid-Open No. 59-97672 and Japanese Utility Model Application No. 58-89053 have been proposed. A syringe biasing device as described in Japanese Utility Model Publication No. 57-33 is used.

A conventional syringe biasing device includes a syringe holder formed on the outer surface of a base, a pushing head that can push a syringe pusher held in the syringe holder, and a feed screw disposed on the base. , a half nut that is integrated with the pushing head in the pushing direction and can be engaged with or disengaged from the feed screw, and a clutch operating section that engages or disengages the half nut with the feed screw. has been done.

At this time, the half nut is always pressed against the feed screw in a state in which it is elasticized by a spring so that it can be engaged, and the clutch operation section is configured to engage the half nut with the feed screw by applying a pushing operation force or a rotation operation force. The setting can be changed to the disengaged position.

That is, the syringe biasing device sets the pushing head to the pushing start position with respect to the pusher of the syringe under a state in which the engagement between the half nut and the feed screw is released by the switching action applied to the clutch operating section. After that, the half nut is engaged with the feed screw by the switching action applied to the clutch operation part, and the pushing head is forcibly moved as the feed screw rotates, pushing the pusher of the syringe and releasing the liquid in the syringe. By releasing the liquid to the outside, it is possible to perform an injection operation into the patient.

[Problems to be Solved by the Invention] However, in the conventional syringe biasing device described above, when the pushing head is manually moved as described above, the half nut is set to a position where it is disengaged from the feed screw. Therefore, it is necessary to keep the clutch operating portion in the pushing operating position or rotating operating position, resulting in poor operability.

Further, if the operating force is weakened while the pushing head is being moved while operating the clutch operating portion as described above, the half nut will mesh with the feed screw, so sufficient care is required.

Furthermore, when the pushing head is manually moved as described above, if the pushing head is guided by the feed screw and the clutch operating part is disposed on the pushing head, the clutch operating part If the pushing head is moved while applying an operating force to the feed screw, the operating force will be applied as an unreasonable force between the pushing head and the feed screw, making it impossible for the pushing head to move smoothly.

Furthermore, in the conventional syringe biasing device described above, the half nut is set to a disengaged position with the feed screw during the forcible movement of the pushing head as described above, and the setting change state is changed. In order to hold it, it is necessary to keep pressing the clutch operation part. For this reason, when the push head runs out of control due to a failure in the control circuit of the feed screw drive motor, etc., it is difficult to reliably stop the runaway of the push head with a single touch and bring it to rest.

The present invention improves the operability of the clutch operation part, allows the pushing head to be moved manually smoothly and easily, and makes it possible to reliably and easily stop the pushing head during forced movement, thereby improving usability. The purpose is to

[Means for Solving the Problems] The present invention provides a syringe holding portion formed on a base, a pushing head that is capable of pushing a pusher of a syringe held on the syringe holding portion, and a pushing head disposed on the base. A biasing mechanism is integrated with the pushing head in the pushing direction, and is always resiliently biased toward the engagement side with the biasing mechanism by the first resilient means, and is biased when engaged with the biasing mechanism. A driven part that transmits force to the pushing head, a clutch operation part that disengages the driven part from the biasing mechanism, and a second triggering means that disengages the driven part from the biasing mechanism and closes the clutch. The clutch is provided with a locking mechanism that resiliently engages with a locked pawl of the operating section to lock the clutch operating section.

[Function] According to the present invention, there are the following effects.

When the clutch operation section sets the driven section to the disengagement position with the biasing mechanism against the elastic force of the first elastic means, the lock mechanism operates the clutch by the elastic force of the second elastic means. The clutch lever engages elastically with the locking pawl of the clutch to lock the clutch operation part.

That is, in the present invention, the driven part can be set to the disengaged position with the biasing mechanism with a one-touch operation of simply pushing the clutch operating part, and that state can be stably and reliably maintained, resulting in extremely good operability. It is.

Therefore, when moving the pushing head manually, there is no need to keep pushing or rotating the clutch operating section, and the pushing head can be moved smoothly and easily.

In addition, if the push head starts running out of control during forced movement of the push head, the clutch operating section can be operated with a single touch to set the driven section to a position where it is disengaged from the biasing mechanism, and the lock mechanism will be activated. Since the clutch operation section is immediately locked and the driven section and the biasing mechanism are maintained in the disengaged state after the setting change, the pushing head that has started running out of control can be reliably and easily stopped.

[Example] Fig. 1 is a plan view schematically showing the internal structure of a syringe biasing device according to an embodiment of the present invention, and Fig. 2 is a side view showing the engaged state of the feed screw and half nut in Fig. 1. Figure 3 is a side view showing the disengaged state of the feed screw and half nut in Figure 1;
FIG. 4 is a plan view showing the appearance of the syringe urging device.

As shown in FIGS. 1 and 4, the syringe biasing device 10 includes a syringe holding portion 13 on the outer surface of a base body 11 that holds the syringe 12 in a predetermined position.
The syringe holding part 13 includes an engagement groove part 15 into which the flange part 14 of the syringe 12 can be engaged. Note that the syringe holding part 13 is
A clamp arm that presses and holds the outer cylindrical portion 16 may be provided. 11A is a power switch, 11B is a start button, 11C is a stop button, 11D is an injection amount display section, and 18 is a liquid agent transport tube.

The syringe biasing device 10 has inside the base 11,
It includes a drive motor 19 and a reduction gear device 20, and supports a feed screw (biasing mechanism) 21 driven by these. The feed screw 21 is attached to the syringe holding part 13
The syringe 12 is disposed along the longitudinal direction of the syringe 12 held in the syringe 12 .

The syringe urging device 10 includes a syringe holding portion 13
The syringe 12 is provided with a pushing head 23 that can push the pusher 22 of the syringe 12 held in the syringe. The push head 23 includes a pusher engaging portion 24 and a guide portion 25 that is loosely attached to the outer circumference of the feed screw 21 and guided by the feed screw 21.

The syringe biasing device 10 is integrated with the pushing head 23 in the pushing direction, and the feed screw 21
It is provided with a half nut (driven part) 26 that can be engaged with or disengaged from. The half nut 26 is provided at the tip of a leaf spring 27 as a first springing means that is cantilever-supported by the pushing head 23, and is constantly pressed against the feed screw 21 while being springed by the leaf spring 27. They are forced to engage.

The syringe biasing device 10 includes a clutch operating lever (clutch operating section) 28 for disengaging the half nut 26 from the feed screw 21. The clutch operation lever 28 is guided by a slide portion 29 provided on the pushing head 23 and moves back and forth, and can abut against the abutting shoulder portion 26A of the half nut 26, and at the reverse end, the half nut 26 is brought into contact with the feed screw 21. The half nut 26 is set in the engaged position (see FIG. 2), and at the forward end, the half nut 26 is set in the engaged or disengaged position with the feed screw 21 (see FIG. 3). The clutch operating lever 28 is provided with a locking pawl 28A at its intermediate portion.

Thus, the syringe biasing device 10 has a stopper (lock mechanism) 30 that locks the clutch operation lever 28 (at the forward end in FIG. 3), which has set the half nut 26 in a position where it is disengaged from the feed screw 21.
Equipped with The stopper 30 is provided at the tip of a leaf spring 31 as a second springing means that is cantilever-supported by the pushing head 23, and is connected to a support shaft 32 implanted in the pushing head 23 through an elongated hole 33. The clutch lever 28 is supported so as to be movable up and down, and is provided with a locking pawl 30A that can engage with a locked pawl 28A of the clutch operating lever 28. That is, the stopper 30 is a leaf spring 31
The clutch operating lever 28 is pushed toward the clutch operating lever 28 side by the clutch operating lever 28, and the half nut 26 is set in a position where it is disengaged from the feed screw 21.
The clutch operating lever 28 is held by engaging the locking pawl 30A with the locked pawl 28A.

Next, the operation of the above embodiment will be explained.

When attaching the syringe 12 to the syringe holding part 13, the pushing head 23 is stopped at a position away from the syringe holding part 13, and after the syringe 12 is attached to the syringe holding part 13, the pushing head 23
is manually set at the starting position of the pusher 22 of the syringe 12. At this time, it is necessary to release the engagement between the half nut 26 and the feed screw 21 by performing the following switching operation on the clutch operating lever 28. That is, when the clutch operating lever 28 is pushed to the forward end and the half nut 26 is set in a position where it is disengaged from the feed screw 21, the pushing head 23 can be freely moved manually. Clutch operation lever 2
8 is pressed in the above manner, the lower surface 28B of the clutch operating lever 28 engages the engagement surface 30B of the stopper 30.
The restraint exerted on the stopper 30 is removed, the stopper 30 is moved upward by the leaf spring 31, and the stopper 30
The locking pawl 30A engages with the locked pawl 28A of the clutch operating lever 28. As a result, the clutch operating lever 28 is locked at the forward end (see FIG. 3).

Clutch operation lever 2 by the stopper 30
The locked state of 8 is achieved by pushing the stopper 30 against the elastic force of the leaf spring 31.
The locking claw 30A of the clutch operating lever 28 is released from its engagement with the locked claw 28A of the clutch operation lever 28. As a result, the clutch operating lever 28 returns to its retracted end by receiving the elastic force of the leaf spring 27 that urges the half nut 26, and the half nut 26 is set in the engagement position with the feed screw 21. Note that the stopper 30 pushed in against the elastic force of the leaf spring 31 is moved upwardly by the engaging surface 30B so that it touches the lower surface 28B of the clutch operation lever 28.
It is restrained and locked in the standby position (see Figure 2).

In this way, the syringe 12 is attached to the syringe holding part 1
3, the pushing head 23 is set to the pushing start position with respect to the pusher 22, and the half nut 26 is set to the engagement position with the feed screw 21. When the drive motor 19 is operated, the feed screw 21 drives the half nut 26, and the pushing head 23 moving together with the half nut 26 pushes the pusher 22 of the syringe 12, thereby injecting the liquid in the syringe 12 accurately at a constant speed.

According to the above embodiment, the clutch operating lever 28
When the half nut 26 is set to the disengaged position with the feed screw 21 against the elastic force of the leaf spring 27, the stopper 30 as a locking mechanism is moved against the clutch operating lever 28 by the elastic force of the leaf spring 31. It resiliently engages with the lock pawl 28A and locks the clutch operating lever 28.

That is, in the above embodiment, the clutch operating lever 2
Half nut 2 with one touch operation just by pressing 8
6 to the disengaged position with the feed screw 21, and this state can be stably and reliably maintained, resulting in extremely good operability.

Therefore, when manually moving the pushing head 23, there is no need to keep pushing or rotating the clutch operating lever 28, and the pushing head 23 can be moved smoothly and easily.

In addition, if the pushing head 23 starts to run out of control during forced movement of the pushing head 23, the clutch operation lever 28 can be operated with a single touch to close the half nut 26.
When the stopper 30 is set to the position where it is disengaged from the feed screw 21, the stopper 30 is moved to the position where the clutch operation lever 2
8, and then tighten the half nut 26 and feed screw 21.
Since the disengaged state after the setting change is maintained, the pushing head 23 that has started running out of control can be stopped reliably and easily.

In carrying out the present invention, the clutch operation section and the lock mechanism are not necessarily disposed on the pushing head, but may be disposed on the base body.

Furthermore, in carrying out the present invention, the pushing head does not need to be guided by the feed screw to move, but may be guided by other guide means such as a guide groove provided in the base.

Further, in carrying out the present invention, the biasing mechanism may be a pinion, the driven portion may be a rack, or other means.

[Effects of the Invention] As described above, according to the present invention, the operability of the clutch operating section is improved, the pushing head can be moved manually smoothly and easily, and the pushing head can be reliably moved during forced movement. Moreover, it can be easily stopped and the usability can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the internal structure of a syringe biasing device according to an embodiment of the present invention, FIG. 2 is a side view showing the engaged state of the feed screw and half nut in FIG. 1, and FIG. The figure is a side view showing the disengaged state of the feed screw and half nut in Figure 1;
FIG. 4 is a plan view showing the appearance of the syringe urging device. 10...Syringe biasing device, 11...Base, 1
2...Syringe, 13...Syringe holding part, 21
...Feed screw (biasing mechanism), 22 ... Pusher, 23
... Pushing head, 26 ... Half nut (driven part), 27 ... Leaf spring, 28 ... Clutch operation lever (clutch operation section), 28A ... Locked pawl,
30...stopper (lock mechanism), 30A...lock claw, 31...plate spring.

Claims (1)

[Scope of Claims] 1. A syringe holding part formed on a base, a pushing head capable of pushing a pusher of a syringe held by the syringe holding part, and a biasing mechanism disposed on the base. , is integrated with the pushing head in the pushing direction and is always pushed toward the engagement side with the biasing mechanism by the first springing means, and when engaged with the biasing mechanism, transmits the biasing force to the pushing head. A driven part that transmits the transmission, a clutch operating part that disengages the driven part from the biasing mechanism, and a second triggering means that releases the locked pawl of the clutch operating part with the driven part disengaged from the biasing mechanism. A syringe biasing device comprising: a locking mechanism that resiliently engages with the clutch operating portion to lock the clutch operating portion. 2. A syringe biasing device according to claim 1, in which a clutch operating portion and a locking mechanism are disposed in a pushing head. 3 In claim 1 or 2,
The biasing mechanism is a feed screw driven by a motor, the driven part is a half nut that is pressed against the feed screw and engages under the condition that it is elasticized by a spring serving as the first elastic means, and the clutch operation part is The clutch operating lever is equipped with a locking pawl, and the locking mechanism is a stopper equipped with a locking pawl that can engage with the locking pawl of the clutch operating lever. A syringe biasing device that holds a clutch operating lever by engaging the locking claw of the clutch operating lever with the driven portion set in the engaged or disengaged position with the biasing mechanism.