JPH01139074A - Syringe energizing device - Google Patents

Abstract

PURPOSE:To enable a press-moved head to move manually, to stop securely and easily, by providing a lock mechanism which locks a clutch operating part in a state of engaging or disengaging a follower drive part with or from an energizing mechanism. CONSTITUTION:A syringe energizing device 10 has a stopper 30 for locking a clutch control lever 28 at such a position that a halfnut 26 engages with or disengages from a feed screw 21. A stopper 30 is provided on a leaf spring 31 which is mounted on a press-moving head 23, and is fixed via a long hole 33 to a supporting axis 32 thrusting through the head 23 to move vertically. The stopper 30 includes a lock nail 30A in mesh with a catch nail 28A of the clutch control lever 28. When the lever 28 is pushed forward to a such a position that the halfnut 26 engages with or disengages from the feed screw 21, the press-moving head 23 is manually moved, and the lock nail 30A engages with the catch nail 28A to lock the control lever 28 on the front edge.

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, a syringe energizing device, such as one described in Japanese Patent Application Laid-open No. 17872/1983, has been used to continuously administer small amounts of anticancer drugs, various antibiotics, etc. to the patient over a long period of time. 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 by the spring so that it can be engaged, and the clutch operating section engages or releases the half nut from the feed screw by applying a pushing operation force. You can change the setting to the position.

That is, the above-mentioned 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 state between the half nut and the feed screw is released by the switching action applied to the clutch operating section. After that, ■ By engaging the half nut with the feed screw by the switching action applied to the clutch operation part, the push head is forcibly moved as the feed screw rotates, and the pusher of the syringe is pushed to release the liquid in the syringe. By discharging it 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 in the above (■), the half nut is not engaged with the feed screw or is in the disengaged position. , it is necessary to keep pressing the clutch operation part, resulting in poor operability.

Also, if you weaken the operating force while moving the push head without operating the clutch 2 operating part as described above, the half nut will mesh with the feed screw, so you need to be very careful. .

In addition, when the pushing head is manually moved as described in (■) above, if the pushing head is guided by the feed screw and the clutch operating section is disposed on the pushing head, the clutch operation If the pushing head is moved without applying any operating force to the part, 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 the engaged or disengaged position with the feed screw by the clutch operating section during the forced movement of the pushing head in accordance with (3) above, and the setting In order to maintain the changed state, it is necessary to keep pressing the clutch operation part. For this reason, when the pushing 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 and calm the running of the pushing head with a single touch.

It is an object of the present invention to improve the operability of a clutch operating section, to enable smooth and easy manual movement of a pushing head, and to reliably and easily stop a pushing head that is being forcibly moved. .

[Means for Solving the Problems] The present invention provides a syringe holding portion formed on a base, a pushing head that allows a syringe held by the syringe holding portion to be pushed, and a pushing head disposed on the base. A biasing mechanism is provided and is integrated with the pushing head in the pushing direction, and is capable of engaging or disengaging from the biasing mechanism, and transmits a biasing force to the pushing head when engaged with the biasing mechanism. A syringe biasing device comprising a driven part and a clutch operation part that engages or disengages the driven part with the biasing mechanism, the syringe biasing device having the driven part engaged with or disengaged from the biasing mechanism. The device is equipped with a locking mechanism that locks the operating section.

[Operation] According to the present invention, when the clutch operating section sets the driven section to the engaged or disengaged position with the biasing mechanism, the locking mechanism locks the clutch operating section, and the engagement between the driven section and the biasing mechanism is changed. The disengaged state after the above setting change is maintained.

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

In addition, if the pushing head starts running out of control during forced movement of the pushing head, when the clutch operating section sets the driven section to the engaged or disengaged position with the biasing mechanism, the locking mechanism will immediately operate the clutch. Since the driven part and the biasing mechanism are kept in the disengaged state after the setting change, it is possible to reliably and easily stop the pushing head that has started to run out of control.

[Example 1] 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, 3rd
The figure is a side view showing a disengaged state of the feed screw and half nut in FIG. 1, and FIG. 4 is a plan view showing the appearance of the syringe biasing device.

The syringe biasing device 10, as shown in FIGS. 1 and 4,
A syringe holding part 13 for holding the syringe 12 in a predetermined position is provided on the outer surface of the base body 11.

The syringe holding part 13 is a flange part 14 of the syringe 12.
It is provided with an engaging structure part 15 that allows the user to engage. The syringe holding part 13 may include a clamp arm that presses and holds the outer cylinder part 16 of the syringe 12, llA is a power switch, IIB is a start button, IIC is a stop button,
110 is an injection amount display section, and 18 is a liquid agent transport pipe.

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

The syringe urging device 10 includes a pushing head 23 that can push the pusher 22 of the syringe 12 held by the syringe holding part 13 . The pushing head 23 is connected to the pusher engaging part 2
4, and a guide portion 25 that is loosely attached to the outer periphery of the feed screw 21 and guided by the feed screw 21.

The syringe biasing device IO is integrated with the pushing head 23 in the pushing direction, and includes a half nut (driven portion) 26 that can be engaged with or disengaged from the feed screw 21. The half nut 26 is provided at the tip of a leaf spring 27 that is supported in a cantilever manner by the pushing head 23, and is constantly pressed and engaged with the feed screw 21 under the condition that the leaf spring 27 is resilient.

The syringe biasing device 10 includes a clutch operating lever (clutch operating section) 28 that engages or disengages the half nut 26 with the feed screw 21.

The clutch operating 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. At the forward end, the half nut 26 is set in the engaged position (see FIG. 2), and the half nut 26 is set in the engaged or disengaged position with the feed screw 21 (see FIG. 3).

Note that the clutch operating lever 28 includes a locked pawl 28A at its intermediate portion.

Thus, the syringe biasing device IO has a stopper (lock mechanism) 30 that locks the clutch operating lever 28 (at the forward end in FIG. 3) when the half nut 26 is set in the engaged or disengaged position with the feed screw 21. Be prepared. Stopper 30
is provided at the tip of a leaf spring 31 that is cantilever-supported by the pushing head 23, and is vertically movably supported by a support shaft 32 implanted in the pushing head 23 via an elongated hole 33. A lock pawl 30A that can engage with a locked pawl 28A of the clutch operation lever 28 is provided. That is, the stopper 30 is urged toward the clutch operating lever 28 by the leaf spring 31, and the clutch operating lever 2 is in a position where the half nut 26 is engaged with the feed screw 21 or disengaged.
The clutch operating lever 28 is held by engaging the locking claw 30A with the locked claw 28A of No. 8.

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

When attaching the syringe 12 to the syringe holding part 13,
After the pushing head 23 is stopped at a position separated from the syringe holding part 13 and the syringe 12 is attached to the syringe holding part 13, the pushing head 23 is manually set to the position where the pushing of the syringe 12 with respect to the pusher 22 starts. do. 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, (1) When the clutch operating lever 28 is pushed to the forward end and the half nut 26 is set in the engaged or disengaged position with the feed screw 21, the pushing head 23 can be freely moved manually.

■When the clutch operating lever 28 is pressed in the above condition (■), the restraint exerted by the lower surface 28B of the clutch operating lever 28 on the engagement surface 30B of the stopper 30 is removed, and the stopper 30 is springed in the L direction by the leaf spring 31. Move and stop - 2 par 30
The lock pawl 30A of the clutch operation lever 28 engages with the locked pawl 28A of the clutch operation lever 28. As a result, the clutch operation lever 2
8 is locked at the forward end (see Figure 3).

The clutch operation lever 28 is locked by the stopper 30 by pushing the stopper 30 against the elastic force of the plate spring 31, thereby locking the stopper 30 (7) and the lock claw 30A.
It is released by disengaging the locking pawl 28A of the clutch operation lever 28. This results in
The clutch operation lever 28 returns to its retreating end in response to 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. The stopper 30 pushed in against the elastic force of the leaf spring 31 is restrained from moving its engagement surface 30B in the opposite direction by the lower surface 28B of the clutch operating lever 28, and is locked in the standby position. (See Figure 2).

In this way, after the syringe 12 is held by the syringe holding part 13, the pushing head 23 is set at the pushing start position with respect to the pusher 22, and the half nut 26 is set at the engagement position with the feed screw 21, the driving When the motor 19 is operated, the feed screw 21 drives the herb nut 26, and the pushing head 23 that moves together with the half nut 26 pushes the pusher 22 of the syringe 12, so that the liquid in the syringe 12 is accurately injected at a constant speed. I will do it.

According to the above embodiment, when the clutch operating lever 28 is used to set the half nut 26 to the engaged or disengaged position with the feed screw 21, the stopper 30 locks the clutch operating lever 28, and the half nut 26 and the feed screw 21 are engaged with each other. The disengaged state after the above setting change is maintained.

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

In addition, if the pushing head 23 starts running out of control during forced movement of the pushing head 23, when the clutch operating lever 28 sets the half nut 26 to the engaged or disengaged position with the feed screw 21, the stopper 30 is moved. Since the clutch operation lever 28 is locked and the disengaged state between the half nut 26 and the feed screw 21 after the setting change is maintained, the pushing head 23 that has started running out of control can be reliably and easily stopped.

In addition, in carrying out the present invention, the clutch operating section and the locking 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 move while being guided by the feed screw, but may move while being guided by other guide means such as a guide groove provided in the base body.

Further, in implementing 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 smoothly and easily manually, and the pushing head is moved during forced movement. Can be stopped reliably and easily.

[Brief explanation of the drawing]

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 a disengaged state of the feed screw and half nut in FIG. 1, and FIG. 4 is a plan view showing the appearance of the syringe biasing device. 10... Syringe biasing device, 11... Base, 12... 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 operating lever (clutch operating part), 2
8A... Locked claw, 30... Stopper (lock mechanism), 3OA... Lock claw, 31... Leaf spring.

Claims (3)

[Claims] (1) A syringe holding part formed on the base, a pushing head that can push the pusher of the syringe held in the syringe holding part, a biasing mechanism disposed on the base, and a pushing head. a driven part that is integrated in the pushing direction and can be engaged with or disengaged from the biasing mechanism, and transmits the biasing force to the pushing head when engaged with the biasing mechanism; and a driven part that is connected to the biasing mechanism. A syringe biasing device comprising a clutch operating section that engages or disengages the biasing mechanism, the syringe biasing device including a locking mechanism that locks the clutch operating section in a state in which the driven section is engaged with or disengaged from the biasing mechanism. Characteristic syringe biasing device. (2) A syringe biasing device according to claim 1, in which a clutch operating section and a locking mechanism are disposed on a pushing head. (3) In claim 1 or 2, the biasing mechanism is a feed screw driven by a motor, and the driven portion is pressed against the feed screw under a state in which it is elasticized by a spring and is engaged. The clutch operating part is a clutch operating lever with a locking pawl, and the locking mechanism is a stopper with a locking pawl that can engage with the locking pawl of the clutch operating lever. With a syringe that holds the clutch operating lever by engaging the locking claw of the clutch operating lever with the driven part set in the engaged or disengaged position with the biasing mechanism. force device.