JPH0263472A - Syringe energizing device - Google Patents

Abstract

PURPOSE:To enable a liquid agent to be reliably injected in a patient by a method wherein on the necessary condition of the starting of operation of an energizing drive part, in which engagement of a driven part with an energizing mechanism is detected by a detecting part, the energizing driven part is controlled. CONSTITUTION:During injection of a liquid agent, through a switching motion applied on a clutch mechanism, a half nut 26 is engaged with a feed screw 21. In this case, a microswitch 40 detects engagement of a fastener 26 with the feed screw 21. When operation starting control of an energizing drive motor 19 is effected by means of an operation starting button 11B of an energizing driven motor 19, a control part 50 starts operation of the energizing driven motor 19 on the condition in which engagement of the half nut 26 with the feed screw 21 is detected by the microswitch 40. Thus, the energizing force of the feed screw 21 driven with the aid of the energizing drive motor 19 causes reliable drive of a press head 23 through the half nut 26 brought into a state to be engaged with the feed screw 21, resulting in the possibility to reliably inject a liquid agent in a syringe 12 in a patient.

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 the one described in Japanese Patent Application Laid-open No. 59-97872, 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 drive motor that drives the feed screw; 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 half nut that engages or disengages from the feed screw. The clutch operation section is configured to include a clutch operation section.

At this time, the half nut is always pressed against the feed screw under the influence of the spring so that it can be engaged, and the clutch operating section engages or disengages the half nut with the feed screw by applying a pushing operation force. You can change the setting to the position.

That is, when the syringe is set, the syringe biasing device moves one step to the pushing position with the half nut and the feed screw disengaged by the switching action applied to the clutch operating section. After setting the pushing head to the pushing start position with respect to the syringe pusher, the half nut is engaged with the feed screw by the switching action applied to the clutch operation section, and the drive motor is started to rotate the feed screw. At the same time, the pushing head is forcibly moved and the pusher of the syringe is pushed to release the liquid in the syringe to the outside, thereby making it possible to perform an injection operation into the patient.

[Problem to be solved by the invention] However, in the above conventional syringe urging device,
The drive motor for the feed screw will start operating if the motor rotation start switch is turned on even under the condition that the clutch production section continues to release the engagement between the half nut and the feed screw. Although the drive motor drives the feed screw, the pushing head and syringe pusher cannot transmit the rotational force of the feed screw and do not move.
No fluid is injected.

In the above situation, for example, when an operator operates multiple syringe energizing devices, he turns on only the motor operation start switch even though the clutch operation part is released as described above, and in reality, This poses a danger to the patient as the patient may think that a liquid medication is being injected even though no liquid medication is being injected.

The present invention reliably drives the pushing head and reliably pushes the pusher of the syringe to ensure that the liquid in the syringe is delivered without driving only the biasing mechanism during operation of the biasing drive unit. The purpose is to make it injectable to patients.

[Means for Solving the Problems] The present invention provides a syringe holding portion formed on a base body, a pushing head capable of pushing a pusher of a syringe held on the syringe holding portion, and a pushing head disposed on the base body. a biasing mechanism that drives the biasing mechanism; a biasing drive unit that drives the biasing mechanism; and a biasing drive unit that is integrated with the pushing head in the pushing direction and that can be engaged with or disengaged from the biasing mechanism; A syringe biasing device comprising a driven part that transmits biasing force to the pushing head when the pushing head is pressed, and a clutch mechanism that engages or disengages the driven part from the biasing mechanism, the driven part being connected to the biasing mechanism. and a detection unit that detects whether or not the driven unit is engaged with the biasing mechanism, and the detection unit detects that the driven unit is engaged with the biasing mechanism as a necessary condition for starting the operation of the biasing drive unit. , a control section that controls the biasing drive section.

[Function] ■When setting the syringe, push the push head while releasing the engagement between the driven part and the biasing mechanism by the switching action applied to the clutch mechanism. Set to the push start position for the child.

(2) When injecting the liquid, the driven part is engaged with the biasing mechanism by a switching action applied to the clutch mechanism.

At this time, the detecting section detects the engagement between the L moving section and the biasing mechanism.Next, when the operation start operation of the biasing drive section is applied by the operation start switch etc. of the biasing drive section, the control The section starts the operation of the biasing drive section on the condition that the detection section detects engagement between the driven section and the biasing mechanism. Therefore, the biasing force of the biasing mechanism driven by the biasing drive section is
Through the driven part that is in engagement with the biasing mechanism as described above,
To reliably drive a push head, and as a result, to reliably inject a liquid in a syringe into a patient.

In addition, in the case (2) above, if the detection section has not yet detected the engagement between the driven section and the biasing mechanism, even if the operation start operation of the biasing drive section is performed by the operation start foot 2 of the biasing drive section, etc. is applied, the control section does not start the energizing drive section.

Therefore, according to the present invention, the energizing drive unit is started by simply performing the operation start operation of the energizing drive unit, and thereafter, the operator injects the liquid even though no liquid is actually injected. It is possible to prevent inconveniences such as people thinking that they are being injected.

[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, Fig. 2 is a plan view showing the off-operation state of the detection section, and Fig. 3 Control block diagram, FIG. 4 is a side view showing the engaged state of the feed screw and half nut in FIG. 1, FIG. 5 is a side view showing the disengaged state of the feed screw and half nut in FIG. 1, and FIG. FIG. 2 is a plan view showing the appearance of the syringe urging device.

The syringe biasing device 10, as shown in FIGS. 1 and 6,
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. In addition, the syringe holding part 13 may be provided with a clamp arm that presses and holds the outer cylinder part 16 of the syringe 12, IIA is a power switch 2, IIB is a start button, IC is a stop button, and IID is an injection amount display part. , 18 is a liquid agent transport pipe.

The syringe biasing bag W10 has a biasing drive motor (biasing drive unit) 19. A reduction gear device JII 20 is provided, and a feed screw (biasing mechanism) 21 driven by the reduction gear device JII 20 is supported. 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 24
In addition, a guide portion 25 is provided loosely on the outer periphery of the feed screw 21 and guided by the feed screw 21.

The syringe biasing device tio is integrated with the pushing head 23 in the pushing direction and includes an eight-flank nut (driven portion) 26 that can be engaged with or detached 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 1110 includes a clutch operating lever (
clutch mechanism) 28. 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.
(See Figure 4).
At the forward end, the half nut 26 is set to a disengaged position with the feed screw 21 (see FIG. 5).The clutch operating lever 28 is provided with a locked pawl 28A at its intermediate portion.

Therefore, the syringe biasing device 10 is
The clutch operating lever 28, which is set to the engaged or disengaged position with the feed screw 21 (at the forward end in FIG. 5), is moved to the low 2
A stopper (lock mechanism) 30 is provided. The stopper 30 is provided at the tip of a leaf spring 31 that is cantilever-supported by the pushing head 23, and is supported by a support shaft 32 implanted in the pushing head 23 through an elongated hole 33 so as to be vertically movable. , and includes a locking pawl 3OA that can engage with a locked pawl 28A of the clutch operation lever 28. That is, the stopper 30 is urged toward the clutch operating lever 28 by the leaf spring 31, and the half nut 26 is pushed toward the feed screw 21.
The clutch operating lever 28 is held by engaging the locking claw 30A with the locked claw 28A of the clutch operating lever 28 set in the disengaged position.

That is, in the syringe urging device 10, when the syringe 12 is attached 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 push head 23 is manually moved to the pusher 2 of the syringe 12.
At this time, it is necessary to release the engagement state between the half nut 26 and the feed screw 21 by performing the following switching operation on the clutch operation lever 28 described above. be. 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 ■, the lower surface 28B of the clutch operating lever 28 is pressed against the stopper 30.
The restraint exerted on the retaining surface 30B of the stopper 30 is removed, and the stopper 30
is moved upward by the leaf spring 31, and the stopper 3
The lock pawl 30A of 0 engages with the locked pawl 28A of the clutch operating lever 28, thereby locking the clutch operating lever 28 at the forward end (see FIG. 5).

The locked state of the clutch operating lever 28 by the stopper 30 is achieved by pushing the stopper 30 against the elastic force of the plate spring 31, thereby causing the lock pawl 3OA of the stopper 30 and the locked pawl of the clutch operating lever 28 to be locked. The clutch operation lever 28 is released by releasing the engagement with the half nut 28A.As a result, the clutch operating lever 28 returns to its retreating end under the elastic force of the leaf spring 27 that is elastically pushing the half nut 26. is set at the engagement position with the feed screw 21.The stopper 30 pushed in against the elastic force of the leaf spring 31 is prevented from moving upwardly by the engagement surface 30B.
, is restrained by the lower surface 28B of the operating lever 28 and locked in the standby position (see FIG. 4).

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 half 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.

Thus, the syringe biasing bag wlO is equipped with a micro sweet 2 (detection section) 40 on the guide section 25 of the pushing head 23. The micro switch 40 is a half nand 26
The barf nut 26 comes into contact with the leaf spring 27 and turns on and off as the barf nut 26 engages and disengages from the feed screw 21 as described above. That is, (1) the microswitch 40 is pressed by the leaf spring 27 (see FIG. 1) when the clutch operating lever 28 is positioned at the aforementioned backward end and the half nut 26 engages with the feed screw 21 (see FIG. 1); (2) the syringe is turned on; 12 or when the pushing head 23 is manually moved after injection, the clutch operating lever 28 is positioned at the forward end described above, and the half nut 26 is positioned at the disengagement position with the feed screw 21. Under the condition, micro switch 40
turns off with the deflection of the leaf spring 27 (see Figure 2).
.

Furthermore, the syringe biasing bag MIO is driven by the aforementioned drive motor 1.
9 is provided. The control unit 50 determines that the microswitch 40 is outputting an on signal (a detection signal indicating that the half nut 26 is engaged with the feed screw 21) as a necessary condition for starting the operation of the energizing drive motor 19. The motor 19 is controlled.

That is, the control unit 50 causes the energizing drive motor 19 to start operating on the condition that both the ON signal (operation start command signal) from the start button 11E described above and the ON signal from the microswitch 40 described above are received. .

Next, the operation of the syringe urging device 10 will be explained.

■When setting the syringe 12, the half nut 26 and feed screw 21 are tightened by the switching action applied to the clutch mechanism.
The pushing head 23 is moved in a state in which the engagement state with the pusher 22 of the syringe 12 is released, and the pushing head 23 is set to the pushing start position with respect to the pusher 22 of the syringe 12.

(2) When injecting the liquid, the half nut 26 is engaged with the feed screw 21 by a switching action applied to the clutch mechanism.

At this time, the micro switch 4o is connected to the half nut 26.
Then, when the drive start button IIB of the energizing drive motor 19 is pressed to start the motor 19, the control section 50 causes the microswitch 40 to switch between the half nut 26 and the feed screw 21. On the condition that engagement with the screw 21 is detected, the biasing drive motor 1
9 starts operation. Therefore, the biasing drive motor 19
The force of the feed screw 21 driven by the screw reliably drives the pushing head 23 via the half nut 26 engaged with the feed screw 21 as described above, and as a result, the liquid in the syringe 12 is reliably delivered. It can be injected into people who have access to the drug.

In addition, in the case (2) above, if the microswitch 40 has not yet detected the engagement between the half nut 26 and the feed screw 21, even if the drive start button IIB of the energizing drive motor 19 is used, the operation of the motor 19 is started. The control unit 50 does not start the motor 19 even if the microswitch 40 outputs an off signal when the start button IIB is turned on. The buzzer 60 sounds for a predetermined period of time to notify the operator of this state.

Therefore, according to the above embodiment, the biasing drive motor 19
By simply performing the operation start operation, the energizing drive motor 19
It is possible to prevent the occurrence of inconveniences such as the operator starting the operation and then assuming that the liquid agent is being injected even though the liquid agent is not actually being injected.

In addition, in implementing the present invention, the clutch mechanism 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 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, when the biasing drive section is operated,
The pushing head can be reliably driven and the pusher of the syringe can be reliably pushed to reliably inject the liquid in the syringe into the patient without idling only the biasing mechanism.

[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 invention, FIG. 2 is a plan view showing the off-operation state of the detection section, and FIG. 3 is a control block diagram. Fig. 4 is a side view showing the engaged state of the feed screw and half nut in Fig. 1, Fig. 5 is a side view showing the disengaged state of the feed screw and half nut in Fig. 1, and Fig. 6 is a side view showing the disengaged state of the feed screw and half nut in Fig. 1. FIG. 2 is a plan view showing the appearance of the device. DESCRIPTION OF SYMBOLS 10... Syringe biasing device 11... Base, 11B... Start button, 12... Syringe, 13... Syringe holding part, 19... Biasing drive motor (biasing drive part), 21...
Feed screw (biasing mechanism), 22... Pusher, 23... Pushing head, 26... Half nut (driven part), 27... Leaf spring, 28... Clutch operation lever (clutch mechanism) ), 28
A: Locked pawl, 30: Stopper (lock mechanism), 30A: Lock pawl, 31: Leaf spring. 40... Micro switch (detection section), 50... Control section.

Claims (1)

[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 biasing mechanism. and a biasing drive unit that is integrated with the pushing head in the pushing direction and can be engaged with or disengaged from the biasing mechanism, and when engaged with the biasing mechanism, transmits a biasing force to the pushing head. A syringe biasing device comprising a driven part that transmits the information, and a clutch mechanism that engages or disengages the driven part from the biasing mechanism,
It includes a detection section that detects whether or not the driven section is engaged with the biasing mechanism, and detects that the detection section detects that the driven section is engaged with the biasing mechanism. A syringe biasing device comprising a control unit that controls the biasing drive unit as a necessary condition for starting operation.