JP3498298B2 - Injection device and syringe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe and an injection device suitable for use with a contrast medium or the like.

[0002]

BACKGROUND OF THE INVENTION contrast agent syringe is disposable, syringe after use in hospitals is piled state in garbage dumps
It is Used syringes Ru Ttei such to the cause of environmental pollution as waste. Today the development of friendly syringe to the environment that calls for environmental problems, but it can be said that one of the very important theme, phase in recent years mechanism from the syringe (piston rod
Corresponding part: Hereinafter referred to as a mechanical part. ) Is provided, a new syringe is provided that has succeeded in greatly reducing the amount of garbage. When using this syringe, a mechanism having the same function as the mechanism of the syringe is provided on the injection device side to fill and eject the contrast agent.

The mechanism part of the injection device is used as the packing of the syringe.
(Part corresponding to piston: hereinafter referred to as packing.)
To securely connect to the you form a mechanical coupling structure
A square type may be utilized. Specifically, it is known that a grip is provided on the packing side of the syringe, and a cam structure for hooking the grip is provided on the mechanism side of the injection device so that the mechanism is coupled to the packing. .
Further, there is also one in which a screw structure having a screw thread is provided on the packing side of the syringe, and a hook that hooks on the screw thread of the screw is provided on the mechanism section side of the injection device.

[0004]

When injecting a contrast medium, it is necessary to perform highly precise fine adjustments regarding the filling amount into the syringe, the injection speed, the pressure applied to the mechanism, and the like. Therefore, in the method of providing the contrast agent by providing the mechanism section on the injection device side, it is necessary to complete the coupling between the packing and the mechanism section. Therefore, it is better to automate the joining operation as much as possible to eliminate manual intervention and visual check. The object of the present invention is to provide a predetermined amount of liquid, a predetermined speed,
It is an object of the present invention to provide a syringe and an injection device which are easy to handle and are less likely to fail in normal operation when the packing and the mechanism are coupled so that the contrast agent can be accurately administered at a predetermined pressure.

By the way, at present, the side effect occurrence rate by administration of a contrast agent is as low as 2.7%, but it goes without saying that it is necessary to pay close attention when using a contrast agent. In the above-mentioned conventional technology, a reliable connection is ensured by taking a complicated structure in the connecting portion between the packing and the mechanism portion in consideration of the safety of the human body. If the structure is complicated in this way, even if a failure occurs in a part of the mechanical mechanism, it may be possible to maintain a firm connection, so it is considered that the patient can be protected from an unexpected situation. However, since the manufacturing process of the syringe is complicated, there is a risk of increasing the incidence of defective products. It also becomes difficult to completely sterilize each part of the syringe. Another object of the present invention is to provide a syringe and an injection device which can safely administer a contrast agent while adopting a simple coupling structure.

[0006]

According to the invention, the above mentioned objects are achieved by means of the patent claims. That is,

(1) Outer cylinder of syringe and inside of the outer cylinder of the syringe
That is slidably inserted in the packing and engages with the packing
And a mechanism for sliding the packing in the axial direction of the syringe
Possess the door, the packing Mesune the coupling portion between the mechanism portion
And the mechanical part is attached to the packing side end.
Male screw that can be screwed into the female screw drilled in the
In an injection device using a syringe, form a round shaft at one end.
To rotate the timing pulley fixed to the round shaft.
A ball screw shaft that is supported so that it can rotate with
The ball nut attached to the ball screw shaft and the
Suppresses rotation of the nut nut as the ball screw shaft rotates.
Insert the retaining frame to be stopped and the ball screw shaft into one end
It is screwed to the female screw formed in the packing that slides inside the syringe.
Secure the connector provided with the male screw part to the
When a ball nut shaft rotates
Ability to move back and forth in the axial direction along the outer circumference of the ball screw shaft.
A moving hollow shaft and the connector side end of the hollow shaft
The timing pulley fixed to the
Is supported so that it can slide freely and can rotate in the circumferential direction of the shaft.
Bearing, and the axial direction provided on the round shaft of the ball screw shaft.
Support the thrust of the shaft and support the shaft to rotate in the circumferential direction.
Proximity to the bearing and the end of the hollow shaft on the connector side
Timing pulley and timing bell
To move the shaft so that it can rotate in both forward and reverse directions.
Close to the secondary motor and the round shaft side end of the ball screw shaft.
Is installed on the timing pulley and timing belt
Therefore, the ball screw shaft can be rotated in both forward and reverse directions.
Where the main motor and packing are located in the syringe
The sensor that detects whether or not the packing is
Sensor information to detect where it is located in
The operation of the main motor and the auxiliary motor based on the report
A means for controlling is provided, and it can be placed at any position in the syringe.
The action of connecting a packing to the mechanical section and packing
Push-out and packing retraction
Both the packing and the detaching operation of the mechanical section are automatically performed.
Injector designed to get you there.

(2) The packing is made of rubber or plastic
And the female thread on the rubber or plastic itself
The syringe according to item (1), in which Since
The operation of the present invention will be described below based on the embodiments of the invention.
explain.

[0009]

[Action] mechanism of the injection device is advanced within the barrel of the syringe
By entering the tip of the mechanism portion when the reach position of the packing in the syringe outer cylinder, a screw structure and a screw structure of the packing mechanism tip by screwing binds. At the time of this coupling, the packing may be located anywhere in the axial direction inside the syringe outer cylinder . Unlike the case where a handle or hook is used, the structure of the binding site is simple due to the adoption of a screw structure.
Oh Ru, but is performed reliably binding error-free. After the liquid filling and injection, the mechanism part of the injection device is rotated in the reverse direction to release the coupling between the packing and the male screw part at the tip of the mechanism part .
Remove the used syringe from the mechanism and discard it .
And become possible.

According to a second aspect of the present invention , the rubber packing or the plastic packing having the female screw structure is connected to the mechanical portion of the injection device. When the rubber packing or the plastic packing and the mechanism part are screwed together, the pressure applied from the outer cylinder of the syringe and the pressure applied from the mechanism part of the injection device are balanced, so that the material is made of soft rubber or plastic. Even with packing, the screw shape is sufficiently maintained.
The rubber packing or the plastic packing does not need to be covered or filled with a member made of hard plastic or hard metal. Since the packing made of only a single material of rubber or plastic is easy and error-free, the syringe according to the present invention can be safely used. Also, since it is not necessary to attach a hard member,
The amount of waste is also reduced .

[0011] tail, but the inside of the sterile syringe is filthy and touched by hand, in a join operation in this invention, a possibility that the inside of the syringe is contaminated by hand first, no. Also,
Even when using a pre-field syringe that is pre-filled with liquid, since the sensor is used, there is no risk of accidentally leaking liquid when connecting with the packing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of a syringe according to the present invention. Syringe shown, the outer cylinder 1 which is molded from a transparent plastic <br/> click, and a packing 2 which is formed of rubber having elasticity. A plastic member that can maintain airtightness can be used for the packing 2. Flange 3 of the outer tube 1, Yes in the shape obtained by cutting the both sides of the circular, since the mounting in this part, the outer tube 1 has a structure that does not rotate is firmly fixed.

A threaded portion 4 is provided inside the packing 2, and the threaded portion 4 serves to connect to the mechanical portion of the injection device. The screw portion 4 is directly cut into rubber and has a female screw structure. When the threaded portion 4 is provided on the rubber material, it is usually necessary to attach a hard member having the threaded portion to the rubber material so that the threaded portion has strength.
The rubber packing is directly threaded.

FIG. 2 is a view showing an embodiment of the injection device according to the present invention, FIG. 3 is an enlarged view of the end portion on the side of the connecting portion with the syringe, and FIG . 4 is the connecting portion with the syringe . On the other side
It is the figure which expanded the edge part . In the figure, a connector 6 provided with a threaded portion 5 to be screwed into a threaded portion 4 formed in a packing is fixed to a deformed shaft 7 at the tip of the mechanism portion. Further, a bush 8 having an inner ring having the same shape as the outer shape of the deformed shaft 7 is covered on the deformed shaft 7. The bush 8 synchronizes with the deformed shaft 7 when a rotational force is applied. When a horizontal force is applied to the deformed shaft 7, the deformed shaft 7 can smoothly slide in the bush 8.

The distribution of the bearing 9 and the spacer 10 rolling on the outer circumferential portion of the bush 8 by stop plate 11 in the front plate 12
By installing the bush 8, the bush 8 itself is configured so as to rotate smoothly but not to move in the horizontal direction. The outer periphery of the bush 8 was fixed to the threaded portion 5 side with a fixing screw 14.
A timing pulley 13 is provided . The lower portion of the front plate 12 and the sub-motor 1 5 is arranged, the sub-motor 1 5
A timing pulley 17 is also attached to the rotating shaft 16 by a fixing screw 18. While connecting the timing pulleys 13 and 17 with the timing belt 19,
By rotating the sub-motor 1 5, rotates the profiled shaft 7 clockwise or counterclockwise.

On the side opposite to the connecting portion of the deformed shaft 7 with the syringe.
The ends are solid-wearing flange 20 by welding. Two needle thrust roller bearings 2 are provided on both sides of the flange 20.
1, 21a are arranged, but the needle thrust roller bearing 2
Stop ring 2 to prevent 1,21a from jumping out
It is fixed to the flange 20 using 2 and a fixing screw 23. Profiled shaft 7 by this structure can be a smooth rotational movement by the rotation of the horizontal direction be a load to the secondary motor 1 5. When the ball screw shaft 24 arranged in the hollow portion of the deformed shaft 7 is rotated, the circulating ball 26 of the ball nut 25 circulates. Therefore, the force for rotating the ball screw shaft 24 smoothly moves the ball nut 25 in the horizontal direction. <br/> It is converted into a force that can

Furthermore, the rear end portion of the ball screw shaft 24 is cut handed to the precise round shaft portion 27, on the outer periphery of the round shaft portion 27, the bearing bush 28 and the bearing washer 29 is provided. Since two needle thrust roller bearings 30, two rolling bearings 31, two bearing collars 32, and one bearing collar 33 are arranged between them, smooth rotation is possible even when a horizontal load is applied. Structure that can get exercise
Is forming . The ball nut 25 is fixed to the holding frame 34 by a tightening nut 35. In order to smoothly perform horizontal movement on the left and right of the holding frame 34, and to prevent the ball nut 25 from co-rotating due to the rotation of the ball screw shaft 24, the two slide shafts 36, 36a and the slide shafts 36, 36a are inserted.
That is attached to two of the slide bush 37,37a.

[0018] The round shaft portion 27 of the ball screw shaft 24 projecting from the face plate 38 after holding the roller bearing such, the timing pulley 39 is engaged deposited by fixing screws 40 to the commercial nut 41. The output shaft 43 of Shumo <br/> over data 4 2 attached to the lower portion of the rear plate 38, the timing pulley 44 is fixed with a fixing screw 45, the timing pulley 39 by the timing belt 46, timing Pulley 44
Connecting the door, by rotating the main motor 4 2, the ball nut 25, the holding frame 34, the profiled shaft 7 can smoothly move it horizontally.

[0019] Rotating the sub motor 1 5 in a counterclockwise direction by these mechanisms, the connector 6 is around the screwing direction of the syringe gasket 2, to rotate the main motor 4 2 clockwise at the same time the ball screw shaft 24 The connector 6 is pushed forward through the ball nut 25, the holding frame 34, and the deformed shaft 7. By rotating the connector 6 and pushing out the connector 6 by the amount of the screw lead of the packing 2, the packing 2 can be connected to the screw portion 5 of the connector 6 without moving in the syringe. By reversing the respective motor 1 5, 42, in the same way, it is possible to remove the connection of the packing 2 and the connecting terminal 6.

FIG. 5 is a three-dimensional representation of the above-mentioned connection between the syringe and the injection device. The parts arranged on the front side are not drawn in order to make the arrangement of each part easier to see. Syringe insertion direction, and the primary and secondary motor 1
The rotation directions of 5, 42 are indicated by arrows. The syringe packing 2 has a cross-section and shows an inner threaded portion 4.

[0021]

As described above , according to the present invention,
It has the following effects. (1) The mechanism moves in the axial direction and the sensor moves to the packing position.
When the position is detected, the two motors operate independently
However, it is possible to control the rotation of the mechanism and the movement of the mechanism in the axial direction.
From the, correct connection between the mechanical section and the packing and proper
Axial movement may be performed to inject the desired drug solution. (2) Same as when moving forward with the packing and mechanism unit connected
Because the packing can be retracted with the precision of
It is also easy to suck the liquid into the syringe. (3) After injecting the required amount of drug solution in the syringe and using it,
No matter where the packing is in the syringe, the packing
The mechanism and the mechanical part were quickly separated, and the packing was built in.
It becomes possible to eject the syringe in this state. (4) Even when using a prefield syringe,
Operation by detecting the position and operating
There is no risk of accidentally leaking liquid due to a mistake in production. (5) Go
Female screw directly on the packing made of rubber or plastic
By adopting a structure in which it is drilled and screwed to the mechanism portion , the packing material can be simplified and the cost can be reduced. ・ Easy and accurate connection and disconnection of packing and mechanism
Can be given. -The amount of waste can be reduced and the burden on the environment can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a syringe according to the present invention.

FIG. 2 is a diagram showing an embodiment of an injection device according to the present invention.

FIG. 3 shows the front part of the injection device.

FIG. 4 shows the rear part of the injection device.

FIG. 5 is a diagram illustrating a mounting aspect of a syringe.

[Explanation of symbols]

1 Outer cylinder 2 Packing 3 Flange 4, 5 Screw part 6 Connector 7, 16, 24, 36, 36a, 43 Shaft 8, 28, 37, 37a Bush 9, 21, 21, 21a, 30, 31 Rolling bearing 10 Spacer 11, Spacer 11, 12, 38 plate 13,17,39,44 screws timing pulleys 14,18,23,40 fixing 15, 42 motor 19,46 timing belt 20 flange 22 sealing ring 25,35,41 nut 26 circulating ball 27 round Shaft 29 Bearing washer 32, 33 Bearing collar 34 Holding frame 39, 45 Fixing screw

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61M 5/145 A61M 5/20 A61M 5/315

Claims (2)

(57) [Claims] 1. An outer cylinder of a syringe, and a sliding member inside the outer cylinder of the syringe.
A movably inserted packing and the packing,
And a mechanism for sliding the packing in the axial direction of the syringe.
The packing has a female screw at the connecting portion with the mechanical portion.
The mechanical part is attached to the packing side end part.
A serial screw formed by forming a male screw that can be screwed into the drilled female screw.
In an injection device using a syringe, a round shaft portion is formed at one end and
A bob that is supported so that it can rotate with the rotation of the pulley.
Ball screw shaft, a ball nut attached to the ball screw shaft, and the ball nut rotates as the ball screw shaft rotates.
The ball screw shaft is inserted through the holding frame that prevents it from sliding, and the end slides inside the syringe.
A male screw part that is screwed into the female screw drilled in the packing
The beam connector is fixed, and the ball nut holding frame is attached to the other end.
Is installed on the outside of the ball screw shaft when the ball screw shaft rotates.
A hollow shaft that can move back and forth in the axial direction along the circumference.
And the timing when the hollow shaft is fixed to the end portion on the connector side.
The pulley and the hollow shaft are slidable in the axial direction and the circumferential direction of the shaft
Bearings rotatably supported in the same direction and the axial thrust provided on the round shaft of the ball screw shaft.
A bearing that holds and rotatably supports the shaft in the circumferential direction.
And disposed in proximity to the connector side end of the hollow shaft,
By the timing pulley and timing belt
A sub-motor for rotatably operating the shaft in both forward and reverse directions, and a ball screw shaft are disposed in close proximity to the round shaft side end portion of the auxiliary motor .
The above-mentioned bob
The main motor that rotates the screw shaft in both forward and reverse directions.
And where the packing is located in the syringe.
Sensor and where in the syringe the packing is located.
The main motor based on the detection information of the known sensor and
A means for controlling the operation of the auxiliary motor is provided, and the packing and the mechanism at an arbitrary position in the syringe are provided.
Part and the packing pushing out operation,
Retracting operation of packing and packing and the mechanical section
It is designed to be able to automatically perform both of the leaving action of
Injection apparatus characterized by some. 2. The packing is made of rubber or plastic
At the same time, make a female screw on the rubber or plastic itself.
The syringe according to claim 1, which is provided.