JPH0530467B2 - - 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, in treating patients, in order to continuously administer anti-cancer drugs, various antibiotics, etc. to patients in small amounts over a long period of time, a system equipped with a syringe as described in, for example, Japanese Patent Application Laid-Open No. 59-97672 has been used. force device 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. Clutch operation section.

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 disengages the half nut from the feed screw by applying a pushing operation force. The position can be changed.

That is, when setting the syringe, the syringe biasing device moves the pushing head in a state in which the engagement between the half nut and the feed screw is released by the switching action applied to the clutch operation section, and the pushing head is moved. After setting the head to the position where it starts pushing against the pusher of the syringe, the half nut is engaged with the feed screw by a switching action applied to the clutch operation part,
Furthermore, by starting the drive motor,
The pushing head is forcibly moved as the feed screw rotates, and the pusher of the syringe is pushed to discharge the liquid in the syringe to the outside, thereby making it 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, the drive motor for the feed screw is unable to operate even under the condition that the clutch operating section continues to disengage the half nut and the feed screw. When the motor rotation start switch is turned on, the motor starts operating.
In this case, although the drive motor idles the feed screw, the push head and the pusher of the syringe 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 the operator does not actually operate the motor. 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 without idling only the biasing mechanism during operation of the biasing drive unit, and reliably pushes the pusher of the syringe to ensure that the liquid in the syringe is filled. 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, 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 that drives the biasing mechanism; a biasing drive section 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.

[Operation] When setting the syringe, the push head is pushed while the engagement between the driven part and the biasing mechanism is released by the switching action applied to the clutch mechanism, and the push head is moved to the position of the syringe. Set to the push start position for the pusher.

During injection of fluid, a switching motion applied to the clutch mechanism causes the follower to engage the biasing mechanism. At this time, the detection section detects engagement between the driven section and the biasing mechanism. Next, when an operation of the biasing drive unit is started using an operation start switch or the like of the biasing drive unit, the control unit detects that the detection unit detects the engagement between the driven unit and the biasing mechanism. As a condition, the energizing drive section is started to operate. Therefore, the biasing force of the biasing mechanism driven by the biasing drive unit reliably drives the pushing head via the driven part that is engaged with the biasing mechanism as described above, and as a result, the syringe The liquid medicine inside can be reliably injected into the patient.

In addition, in the above, if the detection part has not yet detected the engagement between the driven part and the biasing mechanism, even if the operation start operation of the biasing drive part is applied by the operation start switch of the biasing drive part, etc. However, the control section does not cause the biasing drive section to start operating.

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, even though no liquid is actually injected, the operator It is possible to prevent inconveniences such as thinking that a liquid agent is 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 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 control block diagram. FIG. 2 is a plan view showing the appearance of the syringe urging device.

As shown in FIGS. 1 and 6, 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 biasing drive motor (biasing drive unit) 19 and a reduction gear device 20, and supports a feed screw (biasing mechanism) 21 driven by these. Feed screw 21
is the syringe 12 held in the syringe holding part 13
are arranged along the longitudinal direction.

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 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 mechanism) 28 that engages or disengages the half nut 26 with respect to the feed screw 21. The clutch operation lever 28 is guided by a slide portion 29 provided on the push head 23 to move 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 moved against the feed screw 21. (see FIG. 4), and at the forward end, the half nut 26 is set to the disengaged position with the feed screw 21 (see FIG. 5). The clutch operating lever 28 is provided with a locking pawl 28A at its intermediate portion.

Thus, the syringe biasing device 10 is a stopper (lock mechanism) that locks the clutch operating lever 28 (at the forward end in FIG. 5) when the half nut 26 is set in the engaged or disengaged position with the feed screw 21.
30. The stopper 30 is connected to the push head 23
A support shaft 3 is provided at the tip of the leaf spring 31 that is cantilever-supported at the
2 is provided with a locking pawl 30A which is vertically movably supported through an elongated hole 33 and can be engaged with a locked pawl 28A of the clutch operation lever 28. That is, the stopper 30 is urged toward the clutch operation lever 28 by the leaf spring 31, and the stopper 30 is engaged with the locked pawl 28A of the clutch operation lever 28, which has set the half nut 26 in the disengaged position with the feed screw 21. 30A to hold the clutch operating lever 28.

That is, in the syringe biasing device 10, when the syringe 12 is attached to the syringe holding part 13, the pushing head 23 is attached to the syringe holding part 13.
After the syringe 12 is mounted on the syringe holding part 13, the pushing head 2
3 is manually set to the position where the syringe 12 starts pushing with respect to the pusher 22. 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 described above. That is,
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 manner, the lower surface 28B of the clutch operating lever 28 no longer acts on the engagement surface 30B of the stopper 30, and the stopper 3
0 is moved upward by the leaf spring 31, and the lock pawl 30A of the stopper 30 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 No. 5).

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 Fig. 4).

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.

Thus, the syringe biasing device 10 includes a micro switch (detection section) 40 on the guide section 25 of the pushing head 23. Micro switch 40
comes into contact with the leaf spring 27 of the half nut 26,
The half nut 26 is turned on and off as it engages and disengages from the feed screw 21 as described above. That is, when the clutch operating lever 28 is located at the aforementioned backward end and the half nut 26 is engaged with the feed screw 21, the micro switch 40 is activated by the leaf spring 2.
7 (see Fig. 1), and when setting the syringe 12 or manually moving the push head 23 after injection, the clutch operating lever 28 is positioned at the forward end as described above. When the half nut 26 is in the disengaged position with the feed screw 21, the micro switch 40 releases the leaf spring 2.
It turns off with the deflection of 7 (see Figure 2).

Furthermore, the syringe biasing device 10 includes a control unit 50 for the drive motor 19 described above. The control unit 50 determines that the micro switch 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 presses the start button 1 described above.
The energizing drive motor 19 is started to operate on the condition that both the on signal (driving start command signal) of the micro switch 1B and the on signal of the micro switch 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 2 is
6 and the feed screw 21 are released, the push head 23 is moved, and the push head 2
3 is set as the pushing start position of the syringe 12 with respect to the pusher 22.

When injecting the liquid, the half nut 26 is moved to the feed screw 2 by a switching action applied to the clutch mechanism.
1. At this time, micro switch 4
0 detects engagement between the half nut 26 and the feed screw 21. Next, when the operation start operation of the motor 19 is applied by the operation start button 11B of the energizing drive motor 19, the control section 50 detects that the micro switch 40 has detected the engagement between the half nut 26 and the feed screw 21. Under the condition, the energizing drive motor 19 is started to operate.
Therefore, the biasing force of the feed screw 21 driven by the bias drive motor 19 reliably drives the pushing head 23 via the half nut 26 engaged with the feed screw 21 as described above. As a result, the liquid medicine in the syringe 12 can be reliably injected into the patient.

In addition, in the above, the micro switch 40
has not yet detected the engagement between the half nut 26 and the feed screw 21, even if the operation start button 11B of the energizing drive motor 19 is pressed, the motor 19
Even if the operation start operation is applied, the control unit 50 does not start the motor 19. Here, if the micro switch 40 is outputting an off signal when the start button 11B is turned on, the control section 50 sounds the buzzer 60 for a predetermined period of time to notify the operator of this state.

Therefore, according to the embodiment described above, the energizing drive motor 19 is started by simply performing the operation start operation of the energizing drive motor 19, and thereafter, even though no liquid is actually injected, the energizing drive motor 19 is started. This prevents inconveniences such as the operator believing that the liquid agent is being injected.

Note that in carrying out the present invention, the clutch mechanism and the lock mechanism are not necessarily disposed on the pushing head;
It may be arranged on the base.

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, when the biasing drive section is operated, only the biasing mechanism is not driven idly;
The pushing head can be reliably driven, the pusher of the syringe can be reliably pushed, and the liquid in the syringe can be reliably injected into the patient.

[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 plan view showing the off 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. 10...Syringe biasing device, 11...Base, 1
1B...Start button, 12...Syringe, 13...
...Syringe holding part, 19...Biasing drive motor (biasing drive part), 21...Feed screw (biasing mechanism), 22
... Pusher, 23 ... Push head, 26 ... Half nut (driven part), 27 ... Leaf spring, 28 ... Clutch operation lever (clutch mechanism), 28A ...
Locked claw, 30...stopper (locking mechanism),
30A... Lock claw, 31... Leaf spring. 40...
Micro switch (detection section), 50...control section.

Claims (1)

[Claims] 1. A syringe holding part formed on a base body, a pushing head capable of pushing a pusher of a syringe held in the syringe holding part, a biasing mechanism disposed on the base body, and a pushing head that drives the biasing mechanism. a biasing drive unit that is integrated with the pushing head in the pushing direction, 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. and a clutch mechanism for engaging or disengaging the driven part from the urging mechanism, the syringe biasing device comprising: a clutch mechanism for engaging or disengaging the driven part from the biasing mechanism; and a control unit for controlling the biasing drive unit, in which the detection unit detects that the driven part is engaged with the biasing mechanism, as a necessary condition for starting the operation of the biasing drive unit. A syringe biasing device comprising: