JP2000237308A - Infusion pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent the liquid leakage when opening the door case of an infusion pump and to surely seal the infusion pump. SOLUTION: A door case 5 of the infusion pump is provided with a hook 35 and a seal unit 20 fixed to a front surface cap 4 is provided with a crank mechanism for sliding slide clamp 21 passed through a through-groove 25. The external force applied by a user is transmitted via the hook 35 to the crank mechanism when opening the door case 5, by which the slide clamp 21 is forcibly slid and the tube is inserted into the fine width portion of the through- groove 25, by which the pump is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion pump which is used, for example, in a medical infusion apparatus and sends a liquid contained in a container through a tube. The present invention relates to an infusion pump that achieves high sealing properties of a tube.

[0002]

2. Description of the Related Art An infusion pump is disclosed in Japanese Patent Application No. 10-152544 filed by the present applicant. The details will be described later, but if simply shown, by driving a plurality of fingers arranged in a line,
The tube is changed in the longitudinal direction and crushed in order, and the liquid in the tube is pushed away by the deformation of the tube, so that the drug solution contained in a container such as a drug bag is sent through the tube. Such an infusion pump is used, for example, in a medical infusion device and the like.

[0003]

By the way, such an infusion pump is provided with a door case on the front surface, and when the door case is closed, the tube is sandwiched at a predetermined position between the pump body and the door case. To set the tube completely sealed. However, when the door case is opened, the seal is released, so that the liquid remaining in the tube flows after the infusion pump is used, causing liquid leakage. for that reason,
A sealing means is provided to seal the tube when the door case is opened.However, in the past, sealing was performed using the elastic force of the elastic member, and the response was not good, so that the liquid leakage occurred. It is demanded that this can be reliably prevented.

[0004] Therefore, an object of the present invention is to provide an infusion pump that reliably seals when a door case is opened.

[0005]

In order to achieve the above object, the invention according to claim 1 comprises a pump body having a plurality of fingers in a groove for disposing a tube for sending a liquid, and a tube. An infusion pump having a door case having a plate portion for pressing against the finger, wherein the finger sequentially crushes the tube sandwiched between the plate portion and the finger to quantitatively push the liquid in the tube; A seal member that seals by inserting the tube between the narrow portions of the through groove for a tube that is arranged to penetrate the through groove whose groove width changes, and a predetermined member that is connected to the seal member and receives an external force to receive the external force. A crank mechanism that slides the seal member by performing an operation, and transmits an external force to the crank mechanism to the pump body or the door case. And purpose in that it has a use device.

According to the above configuration, when the external force applied by the user is transmitted to the crank mechanism through the action means, the seal member slides due to the crank movement of the crank mechanism. Thereby, when the door case is opened, the seal member seals the tube by sandwiching the tube between the narrow portions of the through groove, thereby blocking the flow of the liquid. Therefore, when the door case is opened, the crank mechanism and the seal member operate by the external force applied by the user, and the tube is securely sealed.

[0007] The invention described in claim 2 is the first invention.
In the configuration of the invention, the action means is an engagement member provided on the door case that engages with the crank mechanism in a predetermined opening / closing area of the door case and transmits the opening / closing force applied to the door case to the crank mechanism. It is intended. According to the above configuration, the engagement member is engaged in the predetermined opening / closing area of the door case. That is, when the user opens the door case from the closed state of the door case, the engaging member moves the door relative to the crank mechanism provided in the pump body only until a certain opening angle for completing the sealing of the tube. The opening / closing force applied to the case is applied, and thereafter, the engagement is not performed at a certain opening angle or more. Therefore, when the user opens the door case, the crank mechanism always makes a crank movement, so that the tube is sealed with good responsiveness and securely by the seal member.

[0008] Further, the invention described in claim 3 is based on claim 2.
In the configuration of the invention, the engaging member is a hook protruding from the door case, and a notch is formed at one end of a bell crank constituting a crank mechanism, and the hook is provided in the notch only in a predetermined opening / closing area. The intention is to enter. According to the above configuration, the hook portion protruding from the door case, which is the engaging member, enters the notch portion of the bell crank, so that the door case and the pump body are engaged only in the predetermined opening / closing region. Therefore, with such a simple configuration, the crank mechanism operates and the tube can be reliably sealed. Note that the bell crank is an arm member that is bent in a substantially L shape and has a fulcrum at a corner.

The invention described in claim 4 is the first invention.
In the structure of the invention, the action means is a pusher that transmits an external force by linear motion to the crank mechanism. According to the above configuration, the external force applied by the user for opening and closing the door case is transmitted to the crank mechanism by the pusher. Thus, when the door case is opened, the crank mechanism and the seal member operate by the external force applied by the user, and the tube is securely sealed. The invention described in claim 5 is the same as the claim 1.
In the structure of the invention, the action means is a door lock handle that transmits an external force to the crank mechanism by rotational movement. According to the above configuration, the external force applied by the user for opening and closing the door case is transmitted to the crank mechanism by the door locking handle. Thus, when the door case is opened, the crank mechanism and the seal member operate by the external force applied by the user, and the tube is securely sealed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying an infusion pump according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a perspective view showing the door case 5 and the front cover 4 of the infusion pump 1 in the present embodiment separately. Further, a seal unit 20 assembled to the front cover 4 and a slide clamp 21 inserted therein are also shown. The seal unit 20 and the slide clamp 21 will be described later. FIG. 2 is a partial sectional view showing the structure of the infusion pump 1. The infusion pump 1 is used as a medical infusion device, and is a finger drive for transporting a drug solution contained in a container (not shown) such as a drug solution bag to a human body or the like via a tube 2. It is of the system. The infusion pump 1 includes a main body case 3, a front cover 4 thereof, and a door case 5 opened and closed with respect to the front cover 4. The main body case 3 has a handle 6 for transportation.

As shown in FIGS. 1 and 2, the surface lid 4 has a concave groove 7 extending along the center thereof and fingers 9A, 9B, 9C, 9C, 9C, 9C for compressing the tube 2 at the center thereof.
A mounting window 8 for arranging 9D, 9E, 9F, 9G is formed. The concave groove 7 is for mounting the tube 2. In the mounting window 8, a plurality (in this case, "7
) Of the fingers 9A to 9G are vertically aligned. The door case 5 has a finger plate 11 provided at the center of the inner surface 10 thereof in correspondence with the fingers 9A to 9G of the mounting window 8.

Each of the fingers 9A to 9G reciprocates in the depth direction of the concave groove 7 to press and compress the tube 2 with the finger plate 11.
As shown in FIG. 2, among these fingers 9A to 9G,
The one located at the top and the sixth located from the top are the seal fingers 9A and 9F for completely crushing the tube 2. Seal finger 9A, 9F
Is a flat plate-like body, has a horizontal projection in the middle of its tip, and crushes the tube 2 flat with the finger plate 11 to completely shut off the flow path of the drug solution, that is, This is for sealing the flow path.
This is because the complete sealing of the tube 2 is indispensable for ensuring the accuracy of transporting the liquid medicine in the infusion pump 1. These two seal fingers 9A, 9F
The other five fingers 9B to 9E and 9G are tubes 2
Finger 9B for compressing without crushing
９9E, 9G. These compression fingers 9B-9E,
9G differs from the seal fingers 9A and 9F only in a flat plate-like body.

As shown in FIG. 1, the finger plate 11 has an elongated piece 11a and two independent pieces 11b and 11c which can move independently of the piece 11a.
And These independent pieces 11b and 11c are provided corresponding to the respective seal fingers 9A and 9F. In the infusion pump 1, when the door case 5 is closed, the seal fingers 9A or 9F are connected to the independent pieces 11b or 11b of the finger plate 11 as shown in FIG.
c, and the tube 2 is sealed.
That is, when the door case 5 is closed with respect to the main body case 3, the tube 2 is completely sealed, so that the liquid medicine does not leak. And, as shown in FIG.
Is provided with a drive mechanism 13 for driving. The drive mechanism 13 includes push rods 14A to 14G provided corresponding to the respective fingers 9A to 9G, a cam shaft 15 for reciprocating the push rods 14A to 14G, and a pulley 1
6, 17 and a stepping motor 19 for driving via a belt 18. The plurality of cams 15a to 15g on the camshaft 15 have different profiles, and are in contact with the respective push rods 14A to 14G.

Next, FIG. 3 is a partial front view showing a state where the seal unit 20 is incorporated in the front cover 4 of FIG. The seal unit 20 has a fixed block 22 provided with the crank mechanism according to claim 1.
2 is a mounting window 1 of the front cover 4 as shown in FIGS.
It is fitted in 2 and screwed. Further, the slide clamp 21 is slidably held in the slide groove 23 cut out in the fixed block 22. A part of the slide groove 23 is formed to be wide, and a holding block 24 for holding the slide clamp 21 is inserted in the wide part. The slide clamp 21 includes a holding block 24
Slides left and right with the movement of. Slide clean 21
Is a substantially strip-shaped flat plate as shown in FIG. 1, and has a through groove 25 whose groove width changes in the longitudinal direction. Then, the slide block 21 has a holding block 24 fitted to a protruding portion 26 provided at the end thereof, and the slide groove 21 has a through groove 2.
The tube 2 is disposed through the tube 5. Note that the slide clamp 21 corresponds to the seal member according to the first aspect.

Next, the crank mechanism provided in the seal unit 20 will be described with reference to FIGS. The door case 5 opens and closes by rotating about the shaft 27 with respect to the front cover 4, and FIGS. 4 and 5 show that the door case 5 opens slightly at about 3.3 ° with respect to the front cover 4. Indicates a state in which FIG. 4 is a sectional view taken along the line AA of FIG. 1, and FIG. 5 is a sectional view taken along the line BB of FIG. As shown in FIGS. 1 and 5, the crank mechanism is configured such that a bent bell crank 28 and a crank rod 29 are pivotally mounted on a crank pin 30 to perform a crank motion. The crank pin 30 is connected to a pin 32 on the fixed block 22 by a spring 31.
The bell crank 28 is rotatably supported by a support shaft 33,
The distal end of the crank rod 29 is pivotally mounted on the holding block 24.

Conventionally, the operation of opening the door case 5 and sliding the slide clamp 21 and the holding block 24 rightward in FIG. 5 to seal the tube 2 are performed only by the restoring force of the spring 31. I was going. However, the response was poor, and a reliable seal could not be obtained when the door case 5 was opened. Therefore, in the present embodiment, this is forcibly performed.
That is, the short side of the bell crank 28 protruding from the front cover 4 toward the door case 5 is provided with a notch 34 at the tip thereof, while the hook 35 is protruded inside the door case 5. The hook 35 is configured to enter the notch 34.

Next, the infusion pump 1 configured as described above.
Will be described. To use this infusion pump 1,
As shown in FIGS. 1 and 2, a part of the tube 2 connected to a container such as a medical solution bag is fitted along the concave groove 7, and the tube 2 is closed with the door case 5 from above. Thereby, the tube 2
Is held between the cases 3 and 5. In this state, the drive mechanism 13 is operated, and the rotation of the stepping motor 19 is reciprocated by the push rods 14A to 14G via the pulley 17, the belt 18, the pulley 16, and the cam shaft 15. Along with this, the fingers 9A to 9G reciprocate sequentially in the depth direction of the concave grooves 7, respectively.
The tube 2 is compressed sequentially along the length of the groove 7. As a result, the drug solution in the drug solution bag is transported to the human body or the like through the tube 2.

On the other hand, the door case 5 may be opened from the main body case 3 in order to terminate the infusion or replace the tube 2. As described above, the infusion pump 1 is configured such that when the door case 5 is closed with respect to the main body case 3, the tube 2 is completely sealed, and the liquid medicine does not leak. However, when the door case 5 is opened, there is no pressing of the seal fingers 9A, 9F against the independent pieces 11b, 11c of the finger plate 11, and the tube 2 is not sealed. The operation of the crank mechanism when the door case 5 is opened will be described.

FIGS. 6, 7, and 8 are explanatory views for explaining the operation of the crank mechanism when the door case 5 is opened. Among the structures of the door case 5 and the surface lid 4, the operation of the crank mechanism is irrelevant. Are omitted. 6 is a fully closed state, FIG. 7 is an open angle of 3.3 ° as in FIGS. 4 and 5, and FIG.
Indicates the state of °. In the fully closed state, as shown in FIG. 6, the short side of the bell crank 28 is pressed by being pressed by the door case 5, the spring 31 is extended, and the holding block 24 is moved to the left position in the figure. Be placed. Thus, since the tube 2 is disposed in the wide portion of the through groove 25 of the slide clamp 21, the flow of the drug solution is not hindered. At this time, the hook 35 has entered the notch 34.

When the door case 5 starts to be opened with respect to the main body case 3, as shown in FIG. 7, the hook 35 catches the notch 34, thereby forcibly rotating the bell crank 28. Further, the restoring force of the spring 31 is also applied, and the crank pin 30 moves rightward in the drawing, and accordingly, the holding block 24 and the slide clamp 21 also slide rightward in the drawing. Since the tube 2 is not displaced from the positioning groove 4a of the surface lid 4, the slide clamp 2
One of the through grooves 25 is sandwiched and sealed by a narrow portion.
On the other hand, as shown in FIGS. 4 and 5, at this open angle of 3.3 °, the distance between the seal finger 9F and the independent piece 11c is about 0.94 mm, and due to the thickness of the tube wall of the tube 2, It can be said that the tube 2 is also sealed at the seal finger 9F. Therefore, at this opening angle of 3.3 °, the seal finger 9F and the slide clamp 2
1 seals the tube 2 at two places.

When the door case 5 is further opened and the opening angle becomes 5 °, the engagement between the hook 35 and the notch 34 is released as shown in FIG. Therefore, at a further opening angle, the hook 35 does not catch the bell crank 28, and the door case 5 is released from the main body case 3. At this time, since the holding block 24 and the slide clamp 21 have sufficiently moved to the right in the figure, the tube 2 is securely sealed.

Therefore, according to the infusion pump of the present embodiment, the opening angle of the door case 5 with respect to the main body case 3 is 0 to 0.
The external force applied by the user to open the door case 5 because the hook 35 engages with the notch 34 within a range of about 5 ° is transmitted to the notch 34 via the hook 35, and the crank movement is further performed. As a result, the rotational movement of the bell crank 28 becomes the linear movement of the slide clamp 21, and the tube 2 is sandwiched between the narrow portions of the through groove 25 to be sealed. Therefore, the slide clamp 2 is provided at an opening angle of about 3.3 ° or less at which the seal can be performed by the seal finger 9F.
1, the sealing is always performed by either the seal finger 9F or the slide clamp 21 and no liquid leakage occurs.

The hook 35 enters the notch 34 only when the opening angle of the door case 5 is in the range of about 0 to 5 °. When the door 35 is opened further, the hook 35 and the notch 34 are engaged. Do not match. Therefore, when the user opens the door case 5, the crank mechanism always performs the crank movement, so that the responsiveness is good, and the tube 2 is securely sealed by the slide clamp 21 and does not hinder the work after opening. Further, since the crank movement is forcibly performed by the external force, it is not necessary to use a strong spring 31. Therefore, when closing the door case 5 by moving the crank in the reverse direction, the door case 5 can be easily moved with a small force.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the invention. For example, numerical values such as the opening angle of the door case 5 and the distance between the seal finger 9F and the independent piece 11c, which are specifically described in the above embodiment, are merely examples, and can be changed according to design conditions. Further, as a modified example, it can be implemented as follows.

In the above-described embodiment, the hook 35 and the notch 34 are used as the action means for transmitting the external force by the user to the crank mechanism. However, as shown in FIG. 9, the pusher 36 is used. You can also. When opening the door case 5, the user presses the pusher 36 leftward in the figure by grasping the pusher 36 together with the door case 5.
Then, the pusher 36 rotates the bell crank 28, and the slide clamp 21 seals the tube 2 as in the above-described embodiment.

Further, in the above-described embodiment, as an action means for transmitting an external force by the user to the crank mechanism,
Although the hook 35 and the notch 34 are used, a handle 37 can be used as shown in FIG. When opening the door case 5, the user grips the handle 37 together with the door case 5 to rotate the handle 37 upward in the drawing. Then, the projection 38 of the handle 37
Rotates the bell crank 28, and the slide clamp 21 seals the tube 2 as in the above embodiment.

[0027]

According to the present invention, since the external force applied by the user is transmitted to the crank mechanism through the action means, and the crank member of the crank mechanism slides the sealing member to seal the tube, It has become possible to provide an infusion pump capable of reliably sealing a tube that prevents liquid leakage when the door case is opened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a door case, a surface lid, a seal unit, and a slide clamp of an infusion pump according to one embodiment.

FIG. 2 is a partial sectional view showing the structure of the infusion pump.

FIG. 3 is a partial front view showing a surface lid.

FIG. 4 is a sectional view showing a front cover and a door case.

FIG. 5 is a cross-sectional view showing a front cover and a door case.

FIG. 6 is an explanatory diagram for explaining an operation of the crank mechanism.

FIG. 7 is an explanatory diagram for explaining the operation of the crank mechanism.

FIG. 8 is an explanatory diagram for explaining the operation of the crank mechanism.

FIG. 9 is an explanatory diagram for explaining a crank mechanism using a pusher as an action means.

FIG. 10 is an explanatory diagram for explaining a crank mechanism using a handle as an action means.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 infusion pump 2 tube 4 surface lid 5 door case 7 concave groove 9A to 9G finger 11 finger plate 20 seal unit 21 slide clamp 25 through groove 28 bell crank 34 notch 35 hook 36 pusher 37 handle

Claims (5)

[Claims] 1. A pump body having a plurality of fingers in a groove for disposing a tube for sending a liquid, and a door case having a plate for pressing the tube against the fingers, wherein the fingers are provided. In the infusion pump, in which the liquid in the tube is quantitatively pushed by sequentially crushing the tube sandwiched between the plate portion and the liquid, the pump body is arranged by penetrating a through groove having a variable groove width. A seal member that seals the tube by sandwiching the tube between the narrow portions of the through groove; and a crank that is connected to the seal member and slides the seal member by performing a predetermined operation by receiving an external force. A mechanism for transmitting the external force to the crank mechanism to the pump body or the door case. Infusion pump, characterized in that it comprises a. 2. The infusion pump according to claim 1, wherein the operating means is engaged with the crank mechanism in a predetermined opening / closing area of a door case, and applies an opening / closing force applied to the door case to the crank mechanism. An infusion pump, which is an engaging member provided on the door case for transmitting. 3. The infusion pump according to claim 2, wherein the engaging member is a hook protruding from the door case, and a notch is formed at one end of a bell crank constituting the crank mechanism. Wherein the hook enters the notch only in a predetermined opening / closing area. 4. The infusion pump according to claim 1, wherein the action means is a pusher that transmits the external force by a linear motion with respect to the crank mechanism. 5. The infusion pump according to claim 1, wherein the action means is a door lock handle that transmits the external force by rotational movement with respect to the crank mechanism.