JPH0135671B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe injection device that allows a liquid medicine in a syringe to be injected into a patient.

Prior Art Conventionally, in treating patients, syringe injection devices have been used to continuously administer small amounts of anticancer drugs, various antibiotics, etc. to patients over a long period of time.

As shown in FIGS. 1 and 2, a conventional syringe injection device 1 includes a syringe holding portion 4 formed on the outer surface of a cabinet 2 to hold a syringe 3.
and a drive motor 5 disposed within the cabinet 2.
and a drive screw 6 driven by a drive motor 5, and a syringe 3 held by the syringe holding part 4.
A pusher head 7 that can push the pusher 3A, and a pusher head 7 that is disposed inside the cabinet 2 and can be connected to the drive screw 6 via a threaded portion 8A formed only on a half of the inner peripheral surface. and a driven nut 8 which is integrated with the pushing head 7 in the pushing direction, and the pushing head 7.
A clutch operation part 9 is disposed close to the drive nut 8 and allows the driven nut 8 and the drive screw 6 to be engaged and disengaged by separating the threaded part 8A of the driven nut 8 from the threaded engagement position with the drive screw 6. have.

That is, the syringe injection device 1 is configured to operate the driven nut 8 by the switching operation applied to the clutch operating portion 9.
When the connection between the drive screw 6 and the drive screw 6 is released,
After setting the pushing head 7 to the pushing start position with respect to the pusher 3A of the syringe 3, the driven nut 8 is moved to the drive screw 6 by a switching action applied to the clutch operation part 9.
By connecting to the syringe 3, the push head 7 is forcibly moved with the rotation of the drive screw 6, and the pusher 3A of the syringe 3 is pushed to release the liquid in the syringe 3 to the outside, thereby injecting into the patient. It is possible to do this. Here, the injection operation by the syringe injection device 1 requires high reliability, such as the need to accurately perform constant, slow injection over a long period of time.

However, in the above-mentioned syringe injection device 1, the slit 2 through which the push head 7 and the clutch operation part 9 can be inserted is inserted into the wall of the cabinet 2.
A is carved in a long range in the pushing direction of the pushing head 7, and the pushing head 7 and the clutch operating portion 9
is movable between one end and the other end of the slit 2A.

Therefore, in the case of the syringe injection device 1,
When a liquid, etc. drops onto the cabinet, a part of the liquid drops from the slit 2A to the cabinet 2.
There is a risk that the particles may enter the interior of the syringe injection device 1, staining the drive mechanism consisting of the drive motor 5, drive screw 6, driven nut 8, etc., and impairing the reliability of the injection operation by the syringe injection device 1. In addition, the above syringe injection device 1
As described above, since injection is performed at a slow rate over a long period of time, changes in the injection operation in the event of an abnormality are minute, and it is extremely difficult to promptly detect an abnormal state. That is,
The syringe injection device 1 has the risk of causing an abnormality in the injection operation, and it is extremely difficult to promptly detect the occurrence of the abnormality, and it is not possible to ensure stable injection operation with high reliability.

Further, in the case of the syringe injection device 1, the internal space of the cabinet 2, which houses the drive mechanism consisting of the drive motor 5, the drive screw 6, the driven nut 8, etc., has a slit 2A forming a relatively wide opening.
Because it is always open to the outside through
There is a risk that lubricating oil, etc. applied to the drive mechanism to ensure smooth operation of the drive mechanism may adhere to the outer surface of the cabinet 2, the push head 7, the clutch operation part 9, etc., and stain the operator's fingers. This may impair the hygiene and the safety of the injection operation.

Therefore, the conventional syringe injection device has the problem that safe and stable injection operation cannot be ensured with high reliability.

OBJECTS OF THE INVENTION The gist of the present invention is a syringe injection device in which the operation of manually setting the pushing head to the pushing start position with respect to the pusher of the syringe can be performed using a clutch operating section provided on the pushing head. It is an object of the present invention to provide a syringe injection device that can ensure safe and stable injection operation with high reliability.

Structure of the Invention In order to achieve the above object, the present invention includes a syringe holding part formed on the outer surface of a cabinet, a driving member disposed inside the cabinet, and a pusher for a syringe held in the syringe holding part. a pushing head capable of pushing the child; a pushing head disposed within the cabinet and connectable to the driving member;
The clutch includes a driven member that is integrated with the pushing head in the pushing direction, and a clutch operating portion that is disposed close to the pushing head and that enables the driven member and the driving member to be engaged and disengaged from each other. In the syringe injection device, one end of a connecting tube extending substantially parallel to the pushing direction of the pusher is fixed to the pushing head, and an intermediate portion of the connecting tube is provided on a vertical wall of the cabinet. , an intermediate member is inserted into the insertion hole provided with the sealing member so as to be movable in the axial direction in a fluid-tight state, and is arranged to extend into the hollow portion of the connecting pipe, and transmits an operation applied to the clutch operating portion to the driven member; A canopy-shaped liquid receiving portion is provided at a portion of the cabinet above the insertion hole.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a sectional view showing a syringe injection device 10 according to an embodiment of the present invention, and FIG.
5 is a sectional view taken along the - line in FIG. 3, FIG. 6 is a sectional view taken along the - line in FIG. 3, and FIG. 7 is a perspective view showing the syringe injection device 10. be.

A syringe holding portion 13 is formed on the outer surface of the cabinet 11 of the syringe injection device 10 to hold 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 inserted, and a clamp arm 17 which can hold the outer cylinder part 16 of the syringe 12 under pressure. Clamp arm 1
Reference numeral 7 makes it possible to press the outer cylindrical portion 16 of the syringe 12 under the biasing force of a compression spring 18 housed within the cabinet 11 .

Further, within the cabinet 11, a drive motor 19 that can be controlled to a predetermined output rotational speed is fixedly disposed, and a drive screw 20, which serves as a drive member in the present invention, is rotatably supported. The output shaft of the drive motor 19 and the drive screw 20 are connected via a drive gear 21 and a driven gear 22. Note that the drive screw 20 is arranged parallel to the central axis of the syringe 12 held by the syringe holding part 13.

Furthermore, a slide groove 23 is carved on the outer surface of the cabinet 11. The slide groove 23 extends in the same direction as the longitudinal direction of the syringe 12 held by the syringe holding part 13.
3 includes a pushing head 2 that can push the pusher 24 of the syringe 12 held in the syringe holding part 13.
The base of 5 is slidably positioned. In the figure, 26 is a head cover of the pushing head 25.

One end of a connecting pipe 27 extending substantially parallel to the pushing direction of the pusher 24 is fixed to the pushing head 25 . The connecting pipe 27 extends parallel to the drive screw 20, and its intermediate portion is connected to the insertion hole 2 formed in the vertical wall portion 28 of the cabinet 11.
9 so as to be movable in the axial direction in a fluid-tight manner, and the other end thereof is located within the cabinet 11.
Note that a sealing member 30 is joined to the insertion hole 29 to ensure a liquid-tight state with respect to the connecting pipe 27. At the other end of the connecting pipe 27, a holding member 3 is provided.
1 is fixed. The holding member 31 has its protrusion 32 slidably engaged in a guide groove 33 in the cabinet 11 which is carved parallel to the drive screw 20. Further, the holding member 31 allows the intermediate portion of the drive screw 20 to be inserted into a hole 35 formed in both side wall portions 34A, 34B. Note that the other end of the connecting pipe 27 passes through one side wall portion 34A of the holding member 31.

In the hollow portion of the connecting pipe 27, an intermediate shaft 36 serving as an intermediate member in the present invention is rotatably extended and arranged. A clutch lever 37, which serves as a clutch operation section in the present invention, is fixed to a portion of the intermediate shaft 36 that projects toward the push head 25 side. The clutch lever 37 is held on both sides by the pushing head 25, and is held by the pushing head 25.
It can be inserted into the housing section 38 inside. A driven nut 39 serving as a driven member in the present invention is fixed to a portion of the intermediate shaft 36 that projects toward the holding member 31 side. The driven nut 39 includes a substantially half-circumferential threaded portion 40, and under the biasing force of a compression spring 41 supported on the back side by the holding member 31, the threaded portion 40 is always kept at the screwed-on position side with the drive screw 20. is under pressure. Further, the driven nut 39 is slidably held on both side walls 34A and 34B of the holding member 31, and is integrated with the pushing head 25 in the pushing direction via the connecting pipe 27. (In addition,
The driven nut 39 may be integrated with the pushing head 25 in the pushing direction via the intermediate shaft 36 and the clutch lever 37 without using the holding member 31 and the connecting pipe 27. ) That is, the clutch lever 37, the intermediate shaft 3
6 and the driven nut 39 are fixed to each other, they apply an operating force to the clutch lever 37 that resists the biasing force of the compression spring 41, and the clutch lever 3
7 is inserted into the accommodating portion 38 of the push head 25, the driven nut 39 is moved through the rotation of the intermediate shaft 36.
rotates between both side walls 34A and 34B of the holding member 31, and the threaded portion 40 of the driven nut 39 engages with the drive screw 2.
0, and it becomes possible to release the connection state between the drive screw 20 and the driven nut 39. Moreover, if the above-mentioned operating force to the clutch lever 37 is removed, the biasing force of the compression spring 41 will cause
The threaded portion 40 of the driven nut 39 returns to its threaded engagement position with the drive screw 20, and the clutch lever 37 projects outward from the housing portion 38 of the push head 25. When the drive screw 20 rotates while the threaded portion 40 of the driven nut 39 and the drive screw 20 are screwed together, the driven nut 39 moves with the rotation of the drive screw 20, and the driven nut 39 and the drive screw 20 move as described above. The pushing head 25, which is integrated in the pushing direction, is also movable in the pushing direction.

A canopy-shaped liquid receiving portion 42 is provided above the insertion hole 29 of the cabinet 11 and protrudes from the vertical wall portion 28 thereof, and the syringe holding portion 1
It is possible to prevent the liquid agent from falling into the insertion hole 29 from the third side. In the figure, numeral 43 is a guide path for causing the liquid agent to fall to a lower position from the insertion hole 29, 44 is an external power input terminal, and 45 is a power switch of the syringe injection device 10.

Specific Effects of the Invention When using the syringe injection device 10 described above, the syringe 12 filled with a liquid agent is first held in the syringe holding portion 13 . Here, the flange portion 14 of the syringe 12 is engaged with the engagement groove portion 15, and the outer cylinder portion 16 of the syringe 12 is held under pressure by the clamp arm 17. A liquid drug injection catheter is connected to the tip 12A of the syringe 12 held in this manner.

Next, the push head 25 and the clutch lever 3
7 applies an operating force to the clutch lever 37 that resists the biasing force of the compression spring 41, and the clutch lever 37 is retracted into the housing portion 38. When the clutch lever 37 is retracted into the accommodating portion 38, the connection between the drive screw 20 and the driven nut 39 is released as described above. is moved along the slide groove 23, and the pushing head 25 is set at the pushing start position with respect to the pusher 24 of the syringe 12.

Next, the operating force applied to the clutch lever 37 is removed, and the threaded portion 40 of the driven nut 39 is returned to the threaded engagement position with the drive screw 20 by the biasing force of the compression spring 41, thereby driving the driven nut 39. Connect to screw 20. Furthermore, if the drive motor 19 is driven,
Through the screw engagement between the drive screw 20, which rotates at a predetermined speed, and the driven nut 39, the push head 25, which is integrated with the driven nut 39 in the pushing direction, moves at a predetermined speed, causing the syringe 12 to be pushed. The child 24 can be pushed at a predetermined pushing speed, and the liquid medicine in the syringe 12 can be injected into the patient at a predetermined injection speed over a long period of time.

Therefore, the syringe injection device 10 has the following effects.

The movement of the clutch lever 37 is controlled by the driven nut 39.
The intermediate shaft 36 that transmits the information to the connecting pipe 27 is disposed to extend into the hollow part of the connecting pipe 27, and the intermediate part of the connecting pipe 27 is inserted into the insertion hole 29 provided in the vertical wall of the cabinet 11 through the sealing member 30 in a liquid-tight manner. , the inside and outside of the cabinet 11 can be sealed liquid-tight.

In particular, since the connecting tube 27 is inserted through the insertion hole 29 so as to be able to move in the axial direction, the sealing surface of the sealing member 30 provided in the insertion hole 29 is always stably and tightly adhered to the entire outer surface of the connecting tube 27. On the other hand, in the case where something like the connecting pipe 27 moves from one end of a slit provided in the cabinet to the other end, even if a sealing member is provided in the slit, the sealing surface of the sealing member is connected to the above-mentioned connection. It is not always possible to maintain stable contact with the entire outer surface of something like the tube 27.

Also, due to the presence of the eave-shaped liquid receiving portion 42, the insertion hole 29 for liquid from the side of the syringe holding portion 13 is prevented.
This makes it possible to more reliably prevent liquid from entering the cabinet 11.

According to the above-mentioned syringe injection device 10, the internal space of the cabinet 11 that houses the drive mechanism consisting of the drive motor 19, the drive screw 20, the drive gear 21, the driven gear 22, the driven nut 39, etc. is liquid-tight from the outside space. It is now possible to seal the cabinet 1.
The liquid agent etc. dripped onto the cabinet 11 will not enter the cabinet 11 and contaminate the drive mechanism, and the lubricating oil etc. in the cabinet 11 will not leak into the cabinet 11.
There is no risk of the injection agent adhering to the outer surface of the container, and safe and stable injection operation can be ensured with high reliability.

Specific Effects of the Invention As described above, the present invention has the following effects.

An intermediate member that can be used as a driven member to control the movement of the clutch operating section is placed in the middle of the connecting pipe, and the middle part of the connecting pipe is fluid-tightly inserted into an insertion hole provided in the vertical wall of the cabinet via a sealing member. Therefore, the inside and outside of the cabinet can be sealed liquid-tight.

In particular, since the connecting tube is inserted through the insertion hole so as to be able to move in the axial direction, the sealing surface of the sealing member provided in the insertion hole always remains in stable contact with the entire outer surface of the connecting tube. On the other hand, in the case where something such as a connecting pipe moves from one end of a slit provided in the cabinet to the other end, even if a sealing member is provided in the slit, the sealing surface of the sealing member is connected to the connecting pipe. It is not possible to always maintain stable contact with the entire outer surface of objects such as.

Further, the presence of the eave-shaped liquid receiving portion prevents the liquid from falling into the insertion hole from the syringe binding portion side, and more reliably prevents the liquid from entering the cabinet.

According to (1) to (1) above, there is no infiltration of liquid or the like into the inside of the cabinet, and there is no adhesion of lubricant or the like to the outer surface of the cabinet, and safe and stable injection operation can be ensured with high reliability.

Further, the syringe injection device according to the present invention is provided with an eave-shaped liquid receiving portion in a portion above the insertion hole of the cabinet, thereby making it possible to more reliably prevent liquid from entering the cabinet. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a syringe injection device according to a conventional example, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view showing a syringe injection device according to an embodiment of the present invention, and FIG. 4 is a sectional view taken along the - line in Fig. 3, Fig. 5 is a sectional view taken along the - line in Fig. 3, Fig. 6 is a sectional view taken along the - line in Fig. 3, and Fig. 7 is a sectional view taken along the - line in Fig. 3. FIG. 10... Syringe injection device, 11... Cabinet, 12... Syringe, 13... Syringe holding part, 20... Drive screw, 24... Pusher, 25...
Pushing head, 27... Connecting pipe, 28... Vertical wall portion, 29... Insertion hole, 30... Seal member, 36
...Intermediate shaft, 37...Clutch lever, 39...
Driven nut, 42...Liquid receiver.

Claims (1)

[Claims] 1. A syringe holding part formed on the outer surface of the cabinet, a driving member disposed inside the cabinet, a pushing head capable of pushing a pusher of a syringe held in the syringe holding part, and the cabinet. a driven member disposed within the drive member and connectable to the drive member and integrated with the pushing head in the pushing direction; a driven member disposed close to the pushing head and the driven member and the drive member; A syringe injection device comprising a clutch operation part that can be connected to and released from the pusher, wherein one end of a connecting tube extending substantially parallel to the pushing direction of the pusher is fixed to the pushing head. The intermediate portion of the connecting pipe is inserted into an insertion hole provided with a sealing member in a vertical wall of the cabinet so as to be movable in the axial direction in a liquid-tight manner, and an operation applied to the clutch operating portion is applied to the driven member. A transmitting intermediate member is disposed to extend in the hollow portion of the connecting pipe, and is located above the insertion hole of the cabinet,
A syringe injection device characterized by being equipped with a canopy-shaped liquid receiver.