JP2023177851A - tube clamp device - Google Patents

Abstract

To provide a tube clamp device which is downsizable and is capable of reliably and quickly clamping a transfusion tube.SOLUTION: A tube clamp device 10 includes: a first swing member 13 which has a first clamp arm 13b clamping a transfusion tube 2 and is opening/closing swung by a drive mechanism including a motor 5; and a second swing member 12 elastically energized in the direction in which it approximates the first clamp arm and has a second clamp arm 12 that can approach and retreat. The first swing member swings the first clamp arm with a motor between a clamp position where the transfusion tube is clamped and a retreat position where the clamp of the transfusion tube is released. The second clamp arm is held at a swing position where the transfusion tube can be clamped by the first holding means 4c between itself and the first clamp arm at a clamp position. By releasing hold of the first holding means, the second clamp arm is configured to be capable of clamping the transfusion tube by an elastic force.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tube clamp device. Specifically, the present invention relates to a tube clamp device that can quickly and reliably block the flow of an infusion when an abnormal operation occurs in an infusion pump or the like that uses an infusion tube.

When administering infusion therapy to a patient, various infusion devices are used. The infusion device includes a pump device such as a roller pump or a peristaltic pump that acts on the middle part of an infusion tube that connects an infusion container to a patient. When performing infusion therapy, if a situation arises in which the flow of the infusion cannot be controlled after an infusion tube filled with infusion is connected to the patient, there is a risk that the infusion will flow freely into the patient, leading to a serious accident. When setting the infusion tube in the infusion device, the infusion tube is clamped with a clamp, so there is little risk of free flow. On the other hand, if an abnormality such as a breakdown occurs in the infusion device, or if the lid of the infusion device is opened during infusion therapy, there is a high possibility that free flow will occur unless the infusion tube is clamped with a clamp. In order to avoid the above-mentioned disadvantages, the above-mentioned infusion device is provided with an automatic clamping device.

Patent No. 5347384

As the automatic clamping device, a mechanical clamping device using the elasticity of a spring or an electric clamping device using a motor or a solenoid is often adopted. Mechanical clamp devices using springs can quickly respond to abnormal operations, such as when a door is accidentally opened, but it is difficult to automate the opening and closing of the clamp during normal operation.

Among electric clamping devices, automatic clamping devices using a motor can respond to various failures by using various sensors. Further, it is easy to automate the clamp operation during steady operation. However, since the clamping device is driven by amplifying the rotational force through gears, etc., the responsiveness of clamping the infusion tube becomes low, making it difficult to quickly clamp the infusion tube in the event of a failure. . Therefore, the above-mentioned free flow will occur until the infusion tube is completely occluded.

On the other hand, automatic clamping devices using a solenoid have high responsiveness, but in order to secure enough pressing force to occlude the infusion tube, a large solenoid is required, which not only increases the size of the infusion device. A large operating current is required, which also increases the cost of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clamp device that can eliminate the above-mentioned disadvantages, reduce the size of the device, and clamp an infusion tube reliably and quickly.

The present invention is a tube clamp device that clamps an infusion tube between a pair of clamping arms, which includes a first clamping arm that clamps the infusion tube, and which is swung open and closed by a drive mechanism including a motor. and a second clamping arm that is elastically biased in a direction approaching the first clamping arm and capable of moving toward and away from the first clamping arm. and a second swinging member, the first swinging member is configured to move the first pinching arm to a pinching position where the infusion tube is pinched and a pinching position where the infusion tube is pinched by the drive mechanism. While the infusion tube is swung between the second clamping arm and the first clamping arm in the clamping position, the second clamping arm is held in the clamping position by the first holding means. By releasing the holding of the first holding means, the second pinching arm is held in a swinging position where it can pinch the first holding means, so that the second pinching arm is moved by the elasticity to the first pinching arm that is in the retracted position. The infusion tube is configured to be placed close to the pressure arm so as to be able to compress the infusion tube.

The tube clamp device according to the present invention holds an infusion tube between a first clamping arm that is swung by the drive mechanism using a motor, and a second clamping arm that is swung by the elasticity of a spring or the like. Apply pressure.

Since the first clamping arm is driven by a motor, its opening and closing operations can be controlled by electrical signals. Therefore, it is easy to incorporate it into a pump device, and various controls can be performed. However, due to the speed reduction mechanism of the motor, it takes time to shift from the open state to the closed state, and responsiveness in an emergency is low. On the other hand, since the second clamping arm is swung by elasticity, the responsiveness of the operation in an emergency is high. However, in order to automatically swing between the open and closed states, a separate drive mechanism such as a motor is required, which increases the size of the device and the manufacturing cost. The present invention is configured such that one of a pair of clamping arms that clamps an infusion tube (first clamping arm) is driven by a motor, and the other (second clamping arm) is driven by elasticity. It is.

The tube clamp device has a first clamping arm that clamps the infusion tube, and a first swinging member that is swinged open and closed by a drive mechanism including a motor, and is adjacent to the first clamping arm. and a second swinging member having a second clamping arm that is elastically biased in the direction and capable of moving toward and away from the first clamping arm.

The first swinging member is configured to allow the first clamping arm to reciprocate between a clamping position where the infusion tube is clamped and a retracted position where the infusion tube is released from the clamping pressure by the drive mechanism. It is oscillated by the motor so as to move. That is, the drive mechanism allows the opening/closing operation during normal operation to be performed automatically based on the control signal of the device. Although the swinging operation by the drive mechanism described above has low responsiveness, it does not pose a problem during steady operation or during non-emergency failures.

On the other hand, the second clamping arm is held by the first holding means in a swinging position where the infusion tube can be clamped between it and the first clamping arm in the clamping position. By releasing the holding of the first holding means, the second clamping arm is brought close to the first clamping arm in the retracted position by the elasticity, and clamps the infusion tube. It is configured so that it can be compressed. That is, the second clamping arm is held at a position where it can clamp the infusion tube between it and the first clamping arm, and is not swung during normal operation. Therefore, in the steady operation, the infusion tube is pinched and pinched and released by the swinging motion of the first pinching arm. On the other hand, when an emergency situation occurs, when the first holding means is released, the second clamping arm is swung toward the first clamping arm by the elastic force. Since the second clamping arm is swung by elasticity, it has high responsiveness and can instantly clamp the infusion tube. Furthermore, since the infusion tube can be clamped regardless of the swinging position of the first clamping arm, the infusion tube can be reliably clamped even if a failure occurs in the drive mechanism.

The configuration of the drive mechanism is not limited. For example, a cam arm that extends from the base end of the first clamping arm of the first swinging member and has a cam protrusion at its tip, is reciprocated by the motor, and the cam protrusion and a cam member having an inclined cam surface that is brought into contact with the cam member. When the above-mentioned cam member is used, it takes time for the first clamping arm to swing, but since the present invention includes the second clamping arm, there is no problem in an emergency, and various drive mechanisms can be adopted. .

The configuration of the first holding means is not limited. That is, it is sufficient if the second clamping arm can be held in the clamping position during steady operation and can be released from the holding in an emergency. For example, an actuator using a solenoid can be used to release the holding of the second clamping arm. Since the holding state is simply released, there is no need for a large solenoid, and the structure can be configured such that the holding state can be released by an electric signal. Further, for example, in the case of an infusion device in which a pump mechanism is formed by a main body and a lid member, a mechanical configuration that can release the holding state when the lid member is inadvertently opened may be adopted.

It is preferable to provide a second holding means capable of holding the second clamping arm in a swinging position retracted from the clamping position. By retracting the second clamping arm from the clamping position, the space between the first clamping arm and the second clamping arm can be increased, making it easier to replace the infusion tube, etc. be able to.

The configuration of the second holding means is not particularly limited. For example, the second holding means is provided with a locking arm extending from the base end of the second clamping arm on the second swinging member, and a fixing member is attached to the tip of the locking arm. It can be constructed by providing a latching member that can be latched to. As the fixing member, for example, the casing or internal structural member of the infusion device can be used. The second holding means can be operated manually, or other actuators can be used.

The first swinging member and the second swinging member can be configured to rotate around an axis, or can be configured to slide and swing. Further, the first swinging member and the second swinging member can be independently provided on separate swinging shafts, or the first swinging member and the second swinging member can be provided independently on separate swinging shafts. Alternatively, the base end portions of the first pinching arm and the second pinching arm may be rotatably connected to each other about the same axis. When held on a common shaft, the second swinging member is provided with a spring arm extending from the base end of the second pinching arm to face the cam arm at a predetermined distance, so that the cam arm and the A compression spring can be arranged between the spring arm and the spring arm. As a result, the second clamping arm is elastically biased toward the first clamping arm. By employing the above configuration, it is possible to downsize the device.

In an infusion pump device, a mechanism for compressing an infusion tube is often provided between the main body and a lid member disposed to cover the front surface of the main body. In the infusion pump configured as described above, the pump mechanism is released by opening the lid member, and at this time, free flow occurs and accidents are likely to occur. Therefore, the first holding means in the tube clamp device can be configured to be linked to the opening/closing operation of the lid member.

That is, in a tube clamp device mounted on an infusion device that includes a lid member constituting a pump mechanism and in which the pump mechanism is driven when the lid member is in the closed state, the second clamp is attached to the lid member in the closed state. The first holding means for holding the pressure arm in the pinching position is provided, and a release mechanism is provided for releasing the locking member constituting the second holding means by closing the lid member. can be provided.

The first holding means may include a locking groove that accommodates and holds the tip of the second clamping arm in the clamping position when the lid member is in the closed state. During normal operation, the lid member is in a closed state, and the second clamping arm is held in the clamping position. When the lid member is opened, the tip of the second clamping arm is removed from the locking groove, and the elasticity causes the second clamping arm to approach the first clamping arm. This prevents free flow and prevents accidents when the lid member is opened inadvertently.

The above-mentioned release mechanism is also not particularly limited. For example, the release mechanism may include a release protrusion that displaces the locking member and releases the locking of the locking member when the lid member is closed.

A tube clamping method according to the present invention is a tube clamping method for an infusion device equipped with a tube clamping device having a pair of clamping arms, which includes a first clamping arm that clamps an infusion tube, and a drive including a motor. a first swinging member that swings open and close by a mechanism; and a first swinging member that is elastically biased in a direction approaching the first pinching arm and swings close to the first pinching arm. and a second swinging member having two pinching arms, and the first pinching arm has a swinging position that blocks the flow of the infusion during normal operation, and a swinging position that allows the flow of the infusion. The driving mechanism controls the drive between the positions, and the second clamping arm is in a position where the infusion tube can be clamped between the first clamping arm and the first clamping arm during the steady operation. The holding state of the second clamping arm is released by a mechanical or electrical output, and the second clamping arm is moved against the first clamping arm by the elastic force. When moved close, the infusion tube is compressed.

In an infusion device including a lid member that covers the infusion tube and is moved to open and close, the holding state of the second clamping arm can be released by opening and closing the lid member.

It is possible to provide a clamp device that can reduce the size of the device and can clamp an infusion tube reliably and quickly.

FIG. 2 is a front view showing a state in which a tube clamp device according to the present invention is attached to an infusion pump device having a lid member. FIG. 2 is a sectional view of a main part taken along the line II-II shown in FIG. 1, and shows a state in which the lid member is opened and an infusion tube is set. 3 is a diagram showing a state in which the lid member is closed from the state shown in FIG. 2. FIG. FIG. 4 is a diagram showing a state in which infusion therapy is started from the state shown in FIG. 3; It is a figure showing the state where a cover member was opened carelessly. 6 is a diagram showing a state in which the clamping pressure of the infusion tube is released from the state shown in FIG. 5. FIG. It is a figure showing the state where the 1st pinching arm was returned to the pinching position. 8 is a diagram showing a state in which the lid member is closed from the state shown in FIG. 7. FIG. It is a figure which returned the 1st clamping arm and the 2nd clamping arm to the clip state in a steady state. FIG. 6 is a diagram showing a state in which the clamping pressure of the infusion tube is released. It is a figure which shows the clamping state of an infusion tube.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the tube clamp device 10 according to the present embodiment is mounted on an infusion pump device 1 in which a main body 3 and a lid member 4 are connected so as to be able to open and close. A peristaltic pump is constructed on the front surface of the main body 3 and the back surface of the lid member 4, and includes a swinging pressing member 25a and a receiving member 25b, which constitute the peristaltic pump 25 so as to sandwich the infusion tube 2 therebetween. The tube clamp device 10 according to the present invention is provided below the peristaltic pump 15.

In the present embodiment, the abnormal situation is set as a case where the lid member 4 is opened inadvertently, and the tube clamp device 10 is configured to operate in conjunction with the lid member 4. The device can also be configured to detect air intrusion using a sensor, operate a solenoid or the like based on a signal from the sensor, and instantly clamp the infusion tube.

As shown in FIG. 2, the tube clamp device 10 includes a first swing member 13 that is swingably held on a swing shaft 21 provided on a fixed wall 11 of the main body 3, and a first swing member 13 that is swingably held on a swing shaft 21 provided on a fixed wall 11 of the main body 3; 21 includes a second swinging member 12 which is held so as to be swingable relative to the first swinging member 13.

The first swinging member 13 includes a first clamping arm 13b that protrudes from the fixed wall 11 and clamps the infusion tube 2, and a first clamping arm 13b that pinches the rotation shaft between the first clamping arm 13b and the rotating shaft. The cam arm 13a is formed to extend to the opposite side, and a cam protrusion 13c is formed on the tip side of the cam arm.

The second swinging member 12 projects from the fixed wall 11 to face the first clamping arm 13b, and clamps the infusion tube 2 between it and the first clamping arm 13b. a second clamping arm 12c, a spring arm 12a extending to the opposite side across the rotation shaft 21, and a latch extending in a direction perpendicular to the second clamping arm 12c and the spring arm 12a. The arm 12b is provided. A first clamping arm 12c is hooked onto the lid member 4 at the distal end of the second clamping arm to hold the second clamping arm 12c in a clamping position that clamps the infusion tube 2 in a steady state. A holding protrusion 12d constituting a holding means is formed.

A drive mechanism for swinging the first swinging member 13 is provided. The drive mechanism includes the cam protrusion 13c, a cam member 15 having an inclined cam surface that slides against the cam protrusion 13c, and a pressing member 5a that is reciprocated by the motor 5. With the cam protrusion 13c in contact with the cam member 15, the cam member 15 is pressed by the pressing member 5a and reciprocated along the sliding surface 5b.

A compression spring 16 is interposed between the cam arm 13a and the spring arm 12a, and the first swinging member 13 and the second swinging member 12 are and the second clamping arm 12c are elastically biased in the direction of approaching each other, and the cam arm 13a is resiliently biased in the direction of approaching the cam member 15.

A latching member 14 constituting a second holding means is rotatably connected to the tip of the latching arm 12b. The tip of the locking member 14 is made to protrude from the opening 11b of the fixed wall 11, and a locking protrusion 14b is provided at the intermediate portion to be hooked to the edge of the opening 11b. Furthermore, a contact portion 14a is provided at the tip of the latching member 14, which abuts against the inner surface when the lid member 4 is moved to close, thereby releasing the latching state of the latching protrusion 14b. It is being

Hereinafter, the operation of the tube clamp device having the above configuration will be explained in order. In this embodiment, the second clamping arm 12 of the tube clamp device 10 is configured to operate in conjunction with the opening/closing movement of the lid member 4, but the operation may also be performed by other actuators such as a solenoid. can.

In FIG. 2, after the lid member 4 is inadvertently opened, the locking protrusion of the locking member 14 of the second release means is locked to the edge of the opening 11b, and the second clamping arm 12c is opened. A state in which the infusion tube 2 is held in a retracted position where the pinching pressure is released is shown. The locking member 14 is operated manually. Note that, prior to this operation, a portion (not shown) of the infusion tube is clamped with a clamp or the like.

After the infusion tube 2 is set or it is confirmed that there is no abnormality, the lid member 4 is moved to close from the above state. When the lid member 4 is moved to close, the release protrusion 4a formed on the back surface of the lid member 4 comes into contact with the contact portion 14a of the hooking member 14 constituting the second holding means, and The latching of the latching protrusion 14b is released. Further, the holding protrusion 12d provided at the tip of the second clamping arm 12c is accommodated in the latching groove 4c of the lid member 4, and the second clamping arm 12c is in the tube clamping position. Retained. As a result, as shown in FIG. 3, the infusion tube 2 is placed in a compressed state.

Thereafter, an infusion start signal is output from a control device (not shown) of the infusion pump main body, and the motor 5 is activated, the pressing member 5a presses the cam member 15, and the cam protrusion 13c is caused to slide on the inclined cam surface. , the first swinging member 13 is caused to swing against the elasticity of the compression spring 16. As a result, as shown in FIG. 4, the first clamping arm 13b swings to the retracted position, the clamp on the infusion tube 2 is released, and infusion is started.

In the infusion pump according to this embodiment, the main body 3 and the lid member 4 constitute a pump mechanism. Therefore, as shown in FIG. 5, if the lid member 4 is erroneously opened during infusion treatment, the function of the pump device will stop, and if this continues, there is a risk that free flow will occur. In this embodiment, when the lid member 4 is opened, the holding protrusion 12d provided at the tip of the second clamping arm 12c is removed from the locking groove 4c. The elasticity of the compression spring 16 causes the second clamping arm 12c to approach the first clamping arm 13b. As a result, the infusion tube 2 is compressed and free flow can be prevented. In addition, in this embodiment, the first pinching arm 13b is driven by a drive mechanism including the motor 5 and a cam mechanism, so the responsiveness is low, and it takes a long time to reach the pinching position of the infusion tube. It takes. On the other hand, since the second clamping arm 12c is driven by the compression spring 16, when the lid member 4 is opened, it is instantly brought close to the first clamping arm 13b and clamps the infusion tube 2. can. Furthermore, the infusion tube 2 can be clamped no matter where the first clamping arm 13b is located. Therefore, safety is extremely high.

After inspecting for abnormalities in the opened state of the lid member 4 shown in FIG. 6, the infusion tube is clamped with a clamp or the like at a position not shown, and the latching protrusion 14b of the latching member 14 is inserted into the opening 11a. By being hooked to the edge, the second pinching arm 12c is retracted from the pinching position. After that, replace the infusion tube and inspect the equipment as necessary.

After replacing or inspecting the infusion tube 2, the drive mechanism is operated based on a signal from a control means (not shown), and the first clamping arm 13b is returned to the clamping position as shown in FIG. . Then, the lid member 4 is moved to close and the infusion is restarted.

If it is determined that there is no abnormality with the first clamping arm 13b shown in FIG. 5 in the retracted position, the lid member 4 can be moved to close as is. As shown in FIG. 8, the holding protrusion 12d provided at the tip of the second narrow pressure arm 12c is configured to be elastically deformable when it comes into contact with the lid member 4, and the holding protrusion 12d is configured to be elastically deformable when it comes into contact with the lid member 4. When the arm 12c is pushed back by the first clamping arm 13b and the holding protrusion 12d is accommodated in the locking groove 4c, it recovers elastically as shown in FIG. 9, and the second clamping arm 12c is configured to be held at the pinching position. This makes it possible to quickly resume infusion if there is no abnormality in the equipment or the like.

The present invention is not limited to the above embodiments. In the embodiment, the present invention is applied to an infusion device that performs intravenous drip, etc., but it can also be applied to, for example, a blood pump device using an infusion tube, a pump device for non-medical use using an infusion tube, and the like. Further, in this embodiment, a configuration is shown in which the tube clamp device is incorporated into an infusion device provided with a lid member, but the tube clamp device according to the present invention can be configured as an independent device.

The tube clamp device according to the present embodiment includes a first clamping arm 13b provided on a first swinging member that is rocked by a drive mechanism including a motor 5, and a first clamping arm 13b that is close to the first clamping arm. Since the infusion tube can be clamped by the second clamping arm, which is elastically biased in the direction and swung close to the first clamping arm, the infusion tube can be compressed quickly in the event that an abnormality occurs in the infusion device. Can correspond to Furthermore, the drive mechanism can be downsized and manufacturing costs can be reduced.

1 Infusion pump 2 Infusion tube 4c Retaining groove (first holding means)
5 Motor 5a Pressing member (drive mechanism)
10 Tube clamp device 12c Second clamping arm 12d Holding protrusion (first holding means)
13 First swinging member 13b First clamping arm 13c Cam protrusion (drive mechanism)
12 Second swinging member 16 Compression spring 15 Cam member (drive mechanism)

Claims (10)

A tube clamp device that clamps an infusion tube between a pair of clamping arms,
a first swinging member having a first clamping arm that clamps the infusion tube and swinging open and closed by a drive mechanism including a motor;
a second swinging member having a second clamping arm that is elastically biased in a direction approaching the first clamping arm and capable of moving toward and away from the first clamping arm; ,
The first swinging member is configured to swing the first clamping arm between a clamping position in which the infusion tube is clamped and a retracted position in which the infusion tube is released from clamping pressure, by the drive mechanism. While moving
The second clamping arm is held by the first holding means in a swinging position where the infusion tube can be clamped between the first clamping arm in the clamping position, and
By releasing the holding of the first holding means, the second clamping arm is brought close to the first clamping arm in the retracted position due to the elasticity, and clamps the infusion tube. A tube clamp device configured to allow pressure. The above drive mechanism is
a cam arm extending from the base end of the first clamping arm of the first swinging member and having a cam protrusion at its tip;
The tube clamp device according to claim 1, further comprising a cam member reciprocated by the motor and having an inclined cam surface with which the cam protrusion comes into contact. The first swinging member and the second swinging member are configured such that base end portions of the first clamping arm and the second clamping arm are rotatably connected to each other about the same axis. ,
The second swinging member includes a spring arm extending from the base end of the second pinching arm and facing the cam arm at a predetermined distance,
The tube clamp according to claim 2, wherein a compression spring is disposed between the cam arm and the spring arm, and the second clamping arm is elastically biased toward the first clamping arm. Device. 3. The tube clamp device according to claim 1, further comprising a second holding means capable of holding the second clamping arm in a swinging position retracted from the clamping position. The second holding means is configured such that the second swinging member is provided with a locking arm extending from the base end of the second pinching arm, and the tip of the locking arm is attached to and detachable from the fixed member. 5. The tube clamp device according to claim 4, further comprising a latching member that can be latched. A tube clamp device mounted on an infusion device that includes a lid member constituting a pump mechanism, and in which the pump mechanism is driven when the lid member is closed,
The lid member is provided with the first holding means that holds the second pinching arm in the pinching position in the closed state, and
6. The tube clamp device according to claim 5, further comprising a release mechanism that releases the latching of the latching member constituting the second holding means by closing the lid member. The first holding means has a locking groove that accommodates and holds the tip of the second pinching arm in the pinching position when the lid member is in the closed state, and
The release mechanism has a release protrusion that displaces the latching member and releases the latching of the latching member by closing the lid member,
The distal end of the second clamping arm is removed from the locking groove by the opening operation of the lid member, and the second clamping arm is brought close to the first clamping arm by the elasticity;
The tube clamp device according to claim 6, wherein the second clamping arm is positioned at the clamping position by releasing the locking member by the release mechanism. A sensor capable of detecting the position of the cam member is provided near the cam member,
The tube clamp according to claim 2, wherein when the sensor detects the position of the cam member and the first clamping arm is in the retracted position, flow in the infusion tube is allowed. Device. A method for clamping a tube in an infusion device including a tube clamp device having a pair of clamping arms, the method comprising:
a first swinging member having a first clamping arm that clamps the infusion tube and swinging open and closed by a drive mechanism including a motor;
a second swinging member having a second clamping arm that is elastically biased in a direction approaching the first clamping arm and swings close to the first clamping arm; Equipped with
During steady operation, the first pinching arm is controlled to be driven by the drive mechanism between a swinging position that blocks the flow of the infusion solution and a swinging position that allows the flow of the infusion solution;
The second clamping arm is held in a position where it can clamp the infusion tube between it and the first clamping arm during the steady operation;
The holding state of the second pinching arm is released by a mechanical or electrical output,
A tube clamping method, wherein the second clamping arm is moved closer to the first clamping arm by the elasticity, and the infusion tube is clamped. 10. The tube clamping method according to claim 9, further comprising a lid member that covers the infusion tube and is moved to open and close, and the holding state of the second clamping arm is released by opening and closing the lid member.

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