JP5908033B2 - Occlusion detection device and infusion device - Google Patents

Description

  [Technical Field] The present invention relates to a flow path for feeding a liquid, mainly a tubular body (a tubular body whose outer shape is deformed by a change in internal pressure, such as a flexible tube), and an infusion solution including the same. It relates to the device.

Conventionally, as this type of technique, a blockage detection technique for a tube (flow path, tubular body) described in Patent Document 1 has been developed.
This comprises a main body part of the most downstream finger in contact with the tube, a magnet provided in the finger main body part, and a Hall element that is arranged opposite to the magnet and detects the displacement amount of the finger main body part. Blockage detection technology.
According to this, the fluctuation | variation of the expansion amount of the tube which arises at the time of tube obstruction | occlusion can be detected by the Hall element as the displacement amount (fluctuation amount of the facing distance from the magnet) of the finger main body. Therefore, the difference in the amount of displacement of the finger main body between the normal time when the tube is not closed and the closed time of the tube is detected by the Hall element to detect the blocking of the tube.

Japanese Patent Laid-Open No. 6-50266 (FIG. 2)

However, in the above prior art, the tube has a configuration in which the outer periphery three sides (upper, lower, and right sides in FIG. 2 of Patent Document 1) are positioned in a narrow groove surrounded by the finger body and the casing. The tube positioning part is easily soiled and it is difficult to clean the part.
When the occlusion detection device is applied to a medical infusion device (infusion pump) or the like, it should be avoided that the structure becomes easily contaminated. However, in the structure as described above, for example, the leaked infusion from above reaches the narrow groove for positioning the tube through the tube, and often remains, so that this portion is easily contaminated. Even if it is easily soiled, it suffices if the portion can be easily cleaned, but there has been a demand for improvement in this regard.
In the above prior art, the tube blockage is detected by the amount of displacement of the finger body, in other words, the amount of movement of the magnet, and is movable to move the magnet facing the Hall element as the tube expands. Requires a mechanism (detection mechanism). In the prior art, this movable mechanism is also used as the main body of the finger, but in any case, it is difficult to reduce the size of the blockage detection component, and an improvement in this respect has been desired.

  The present invention has been made in view of the above-described circumstances, and the location where the flow path (tubular body) is positioned is not easily contaminated, and the location can be easily cleaned, and the blockage detection component can be reduced in size. It is an object of the present invention to provide an occlusion detection device and an infusion device that can be converted into a single body.

In order to achieve the above object, the blockage detecting device according to claim 1 is an infusion device having a pump mechanism for elastically deforming a flexible flow path to send a liquid, and by expansion of the flow path. an apparatus for detecting a blockage of the flow path in the upstream and downstream side of the pump mechanism with a pressure sensor in which the sensor surface is deformed, a predetermined gap on the back surface the flow path is positioned on the surface during occlusion detection placed so as to face the sensor surface, and the sheet-shaped or film-shaped elastic member for transmitting the expansion of the flow channel is interposed between the flow path and the sensor surface to the sensor surface, clogging of the flow path In a detection state, the flow path positioned on the surface of the elastic body is brought into close contact with the elastic body surface with a predetermined pressing force, and a change in the internal pressure of the flow path is brought into contact with the sensor surface of the pressure sensor via the elastic body. Communicate Characterized by comprising a flow path pressing, the.
The blockage detection device according to claim 2 is the blockage detection device according to claim 1, wherein the predetermined channel positioning region on the surface of the elastic body is formed flat or curved without unevenness. It is characterized by.
The blockage detection device according to a third aspect is the blockage detection device according to the first or second aspect, wherein the elastic body is fixed to the frame body and is detachable together with the frame body.
The blockage detection device according to claim 4 is the blockage detection device according to any one of claims 1 to 3, wherein the pressure sensor is a strain gauge that detects external deformation of the flow path in the blockage detection state. And
The occlusion detection device according to claim 5 is the occlusion detection device according to any one of claims 1 to 4, wherein the gap has a predetermined value of 0.5 mm or less. Features.
The occlusion detection system according to claim 6, in the closed detection device according to any one of of the preceding claims 1 to 5, wherein the elastic body, the thickness of its is 0.05mm or more, 0.5 mm or less It is characterized by being.
The infusion device according to claim 7 is characterized in that the flow path is an infusion tube, and the obstruction detection device according to any one of claims 1 to 6 is provided.

According to the present invention, the flow path is not positioned in a narrow groove as in the prior art. In other words, since the elastic body is interposed between the flow path and the sensor surface, the pressure sensor is not in direct contact with the flow path (tubular body), so that dirt due to leakage infusion does not adhere to the sensor surface of the pressure sensor. Cleanliness is maintained, and it is possible to prevent occurrence of detection errors due to adhesion of dirt on the sensor surface. Furthermore, there is an effect that a movable mechanism is not required and the blockage detection component can be easily downsized.
In particular, according to the invention described in claim 2, since the predetermined flow path positioning region on the surface of the elastic body is formed flat or curved without unevenness, the leaked infusion or the like adheres firmly to the location. Can avoid residue, less stains. Even if it gets dirty, cleaning is extremely easy.
Here, the “predetermined flow channel positioning region” means that leaked infusion or the like can be prevented from sticking and remaining firmly at the flow channel positioning location and its periphery in the flow channel positioning region, and it can be dirty. Is set to a size that can be cleaned very easily.

It is a side view which illustrates the basic structure of the obstruction | occlusion detection apparatus which concerns on this invention. It is a perspective view which shows 1st Embodiment of an obstruction | occlusion detection apparatus same as the above. It is a perspective view which shows 2nd Embodiment of an obstruction | occlusion detection apparatus same as the above. It is a perspective view which shows an example of the pressure sensor used by 1st, 2nd embodiment of an obstruction | occlusion detection apparatus same as the above. It is explanatory drawing of the space | gap (DELTA) g of an elastic body back surface and a sensor surface in the same obstruction | occlusion detection apparatus same as the above, and the clearance gap G between a tube pressing front end surface and a sensor surface. It is a graph which shows the relationship between the tube internal pressure at the time of changing the space | gap (DELTA) g and a pressure sensor output voltage. It is a graph which shows the relationship between the tube internal pressure at the time of changing an elastic body thickness, and a pressure sensor output voltage. It is a table | surface figure which shows the relationship between the crushing rate of a tube, and a restoration rate according to temperature. 1 is a perspective view illustrating an infusion device to which a first embodiment of a blockage detection device of the present invention is applied. It is a disassembled perspective view which shows the specific example of the obstruction | occlusion detection apparatus integrated in an infusion apparatus same as the above. It is a figure which expands and shows the cross section of the obstruction | occlusion detection apparatus part in the state with which the tube was mounted | worn with the infusion apparatus same as the above and the door was closed. It is a perspective view which illustrates the infusion apparatus with which 2nd Embodiment of this invention obstruction | occlusion detection apparatus was applied. It is a disassembled perspective view which shows the specific example of the obstruction | occlusion detection apparatus integrated in an infusion apparatus same as the above. It is an expansion perspective view of the cartridge type elastic body in FIG. 12, FIG. It is an enlarged view of the sensor part in FIG. FIG. 13 is an enlarged view of the sensor part in FIG. 12 with the viewpoint slightly moved to the left. It is a figure which shows the state by which the cartridge type elastic body was mounted | worn with the sensor part shown in FIG. It is a figure which shows the state by which the cartridge-type elastic body was mounted | worn with the sensor part shown in FIG. It is a perspective view for demonstrating removal of the cartridge type elastic body with which the sensor part was mounted | worn.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. Prior to that, the background to the present invention and the outline of the present invention will be described first.
A tubular body that is a flow path for feeding a liquid in a pump device, in particular, an infusion tube for feeding medicinal solution or dialysate in an infusion device (infusion pump) used in the medical field, during a liquid feeding operation by a pump mechanism, It must be managed so that it does not become blocked.
Therefore, a device for detecting the blockage of the infusion tube is indispensable as a safety device, and the tube blockage detection technique described in Patent Document 1 has been developed. However, this blockage detection technique has the problems described above.

The present inventors diligently conducted experimental studies on the above problems, and as a result, came to invent a blockage detection apparatus having the basic structure shown in FIG.
The blockage detection device according to the present invention (the blockage detection device of the present invention) is a blockage of the tubular body on the upstream and downstream sides of a flexible flow path, mainly a pump mechanism that elastically deforms the tubular body and feeds liquid. , Which is disposed upstream or downstream of the pump mechanism, or upstream and downstream of the pump mechanism, and detects an internal pressure (internal pressure) of the tubular body during the liquid feeding operation of the pump mechanism. Device.

FIG. 1A is a side view showing an outline of the blockage detection device of the present invention in a blockage detection state of a tubular body (flow channel), here, an infusion tube (hereinafter also referred to as a tube). FIG.1 (b) is a side view which removes a tube from Fig.1 (a) and shows. In addition, the same code | symbol shows the same or equivalent part between each figure referred in this specification.
As can be seen from FIGS. 1A and 1B, the blockage detection device of the present invention includes an elastic body 1, a pressure sensor 2, and a tube presser (flow path presser) 3.
The elastic body 1 is a flat sheet-like or film-like (hereinafter referred to as a sheet-like) elastic body having a front surface and a back surface on which the tube T is positioned in the up-down direction when blockage is detected. As this elastic body 1, a synthetic resin having water resistance and water repellency is suitable.
The pressure sensor 2 is a sensor that places a predetermined gap Δg on the back surface (flat surface) of the elastic body 1 and faces the sensor surface 2a, and outputs a signal corresponding to the deformation of the sensor surface 2a, and a strain gauge is preferable. It is an example. If the elastic body 1 is formed of a translucent material, the state of the sensor surface 2a of the pressure sensor 2 can be confirmed without removing the elastic body 1. The shape of the elastic body 1 does not necessarily need to be completely flat, and a slight curved shape is allowed. In this case, the gap Δg indicates the smallest gap among the gaps between the back surface of the curved elastic body 1 and the sensor surface 2a.
The tube retainer 3 causes the tube T positioned on the surface (flat surface) of the elastic body 1 to be in close contact with the elastic body 1 with a predetermined pressing force in a state in which the tube T is detected to be closed, and changes in the internal pressure of the tube T are pressure sensors. 2 is a pressing member that is transmitted through the elastic body 1 to the second sensor surface 2a. With this tube presser 3, the pressure sensor 2 can correctly detect the change in the internal pressure of the tube T.
Although not shown in FIG. 1, a pump mechanism for feeding a liquid such as a chemical solution through the tube T is disposed above or below the blockage detection device of the present invention. As the pump mechanism, a peristaltic type is used. However, any pump mechanism other than the peristaltic type can be used as long as it is a pump mechanism that elastically deforms the flexible tube T and feeds the liquid. But you can.

In the state of detecting the blockage of the tube T shown in FIG. 1A, if the tube T is blocked during the liquid feeding operation of the pump mechanism, the internal pressure of the tube T that is pressed by the tube presser 3 and is in close contact with the elastic body 1. Changes. The change in the internal pressure of the tube T is transmitted to the sensor surface 2a via the elastic body 1 that is in close contact with the sensor surface 2a of the pressure sensor 2, and deforms the sensor surface 2a. For example, when the tube T is closed and its internal pressure rises and expands to deform its outer shape, this outer shape deformation is transmitted to the sensor surface 2a of the pressure sensor 2 via the elastic body 1 to deform the sensor surface 2a. As a result, the pressure sensor 2 outputs a signal corresponding to the deformation of the sensor surface 2a. Therefore, the blockage of the tube T is detected by the change in the output signal of the pressure sensor 2.
The blockage detection signal from the blockage detection device (pressure sensor 2) of the present invention is used as an input signal of a blockage alarm device, for example, to notify the occurrence of blockage. Further, the pump mechanism is forcibly stopped by being used as a forced stop signal for the pump mechanism.

According to the occlusion detection device of the present invention, the location where the tube T is positioned in the occlusion detection is the flat surface of the elastic body 1 (the flat surface without irregularities). Therefore, for example, even if leaked infusion from above reaches the positioning location (surface) of the tube T through the tube T, the location does not have unevenness, so that it does not adhere firmly and does not remain. It is hard to get dirty. Even if it is dirty, cleaning such as wiping can be performed very easily.
Since the pressure sensor 2 is provided on the back side of the elastic body 1 and is not in direct contact with the tube T, dirt due to the leaked infusion or the like does not adhere to the sensor surface 2a of the pressure sensor 2, and cleanliness is maintained. Be drunk. In addition, it is possible to prevent occurrence of a detection error due to adhesion of dirt on the sensor surface 2a.
When the occlusion detection device is applied to a medical infusion device or the like, it is necessary to avoid a structure that is easily contaminated, and the occlusion detection device of the present invention is extremely useful in this respect.

The outer shape deformation of the tube T is indirectly transmitted to the sensor surface 2a of the pressure sensor 2, but the member that transmits the outer shape deformation is the elastic body 1 and is transmitted to the sensor surface 2a of the pressure sensor 2 without any trouble. it can.
In addition, the pressure sensor 2 has the following advantages because the sensor surface 2a is opposed to the elastic body 1 with a gap Δg on the back surface. That is, in the state shown in FIG. 1B in which the tube T is not positioned on the surface of the elastic body 1, even if the elastic body 1 or the pressure sensor 2 has a variation in position, thickness, etc., there is a gap Δg. As long as the body 1 is not in contact with the sensor surface 2a, the output signal of the pressure sensor 2 can be maintained at a predetermined value, for example, 0. Therefore, it is possible to prevent a decrease in measurement accuracy due to the occurrence of the above-described variation.
Further, the blockage detection apparatus of the present invention does not require a movable mechanism as in the prior art, and the movement amount required for the blockage detection operation is sufficient to be approximately the size of the gap Δg, so that the blockage detection component can be easily downsized.

In the occlusion detection device of the present invention, the following three examples are mainly given as examples of the form and arrangement of the elastic body 1 having a flat surface on which the tube T is positioned.
(1) A thin sheet-like elastic body integrated with a chassis portion of the blockage detection device of the present invention.
(2) A removable or replaceable sheet-like elastic body that is attached to the chassis portion using double-sided tape or the like.
(3) A cartridge-type elastic body in which a sheet-like elastic body is attached and fixed to a frame body that can be detachably incorporated in the chassis portion, and can be removed or replaced together with the frame body.
Of the above examples (1) to (3), any example may be applied to the actual apparatus configuration, and any of the examples can exhibit the above-described effects.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a perspective view showing a first embodiment of the occlusion detection device of the present invention to which the above (1) example is applied, and FIG. 3 is a diagram of the occlusion detection device of the present invention to which the above (3) example is applied. It is a perspective view which shows 2 embodiment. FIG. 4 is a perspective view showing an example of the pressure sensor 2 used in the first and second embodiments.
2 and 3, reference numeral 21 denotes a chassis portion of the blockage detection device of the present invention. In the first embodiment shown in FIG. 2, the thin sheet-like elastic body 1 is integrally provided on the chassis portion 21. In the second embodiment shown in FIG. 3, the sheet-like elastic body 1 is attached and fixed to the frame body 11, and is attached to and detached from the chassis portion 21 as a cartridge-type elastic body 12 that can be removed or replaced together with the frame body 11. Built in freely.
In any embodiment, when the tube T is blocked during the liquid feeding operation of the pump mechanism in the tube T blockage detection state shown in FIG. 1A, the tube T is pressed by the tube presser 3 and is in close contact with the elastic body 1. The internal pressure of the tube T is changed. The change in the internal pressure of the tube T is transmitted to the sensor surface 2a via the elastic body 1 that is in close contact with the sensor surface 2a of the pressure sensor 2, and deforms the sensor surface 2a. Thereby, the pressure sensor 2 outputs a signal corresponding to the deformation of the sensor surface 2a, and the blockage of the tube T is detected by a change in the output signal of the pressure sensor 2. An output signal (blockage detection signal) from the pressure sensor 2 is input to, for example, a blockage alarm device, and the blockage alarm device notifies the occurrence of blockage. In addition, the pump mechanism is forcibly stopped.

Here, when the gap Δg between the back surface of the elastic body 1 and the sensor surface 2a of the pressure sensor 2 shown in FIG. 5 is changed, the internal pressure of the tube T (tube internal pressure) and the pressure sensor 2, here a strain gauge The relationship with the output signal (voltage) is shown in the graph of FIG.
The relationship between the tube internal pressure and the output voltage of the pressure sensor 2 (strain gauge) when the thickness of the elastic body 1 is changed is shown in the graph of FIG.
Regarding types of the tube T, type 1 and type 2 are two types of tubes having different outer diameters, inner diameters, and hardnesses, and type 2 is a harder tube having a smaller outer diameter than type 1.
In addition, since the tube T is pressed by the tube presser 3, the gap G between the distal end surface (the lower surface in FIG. 5) of the tube presser 3 and the sensor surface 2a of the pressure sensor 2 shown in FIG. Is also a small value. In consideration of component tolerances and the like, it is considered that the tube T can be surely pressed if the gap G is set to a value that is at least 0.5 mm smaller than the outer diameter of the tube T.
From the graph shown in FIG. 6, in the case of two types of tubes T (type 1 and type 2) and the gap Δg is 0.5 mm, there is almost no change in the range of −80 kPa to −40 kPa of the type 1 tube T. I understand that. From this result, it can be seen that when the gap Δg is increased to 0.5 mm or more, the tube internal pressure cannot be detected correctly.
Moreover, it can be seen from the graph shown in FIG. 7 that the tube internal pressure can be correctly detected in the range of the thickness of the elastic body 1 of 0.05 mm to 0.5 mm. As the thickness of the elastic body 1 is reduced, the rigidity is reduced, so that the possibility of breakage or the like is increased and the elastic body 1 is not suitable for cleaning. Further, the accuracy of transmitting the change in the internal pressure of the tube T to the pressure sensor 2 decreases as the thickness of the elastic body 1 increases. Considering these practical use conditions, the thickness of the elastic body 1 is preferably in the range of 0.05 mm to 0.5 mm.
On the other hand, from the table shown in FIG. 8, it can be confirmed that the restoration rate of the tube T when left at low temperature (here, left at 5 ° C.) is restored regardless of the crushing rate. However, it can be seen that when left at a high temperature (40 ° C. in this case), the higher the crushing rate, the more the restoration does not occur. Therefore, from this, it can be said that the tube crushing rate should be as small as possible. Further, comparing Type 1 and Type 2, it can be seen that Type 2 has a lower restoration rate.
Based on these, the gap G in measuring the relationship between the pressure in the tube and the output voltage of the pressure sensor 2 was set to a value 0.5 mm smaller than the outer diameter size of the type 2.
From the experimental results shown in FIGS. 6 to 8, the following conclusions were obtained for the gap Δg between the back surface of the elastic body 1 and the sensor surface 2 a of the pressure sensor 2.
That is, in order to measure a stable tube internal pressure, the gap G is set to a value about 0.5 mm smaller than the outer diameter of the tube T, the thickness of the elastic body 1 is set to 0.05 mm to 0.5 mm, and the gap Δg is 0. The result that 0.5 mm or less (over 0 mm and 0.5 mm or less) was desirable was obtained.
In consideration of dimensional errors of the chassis portion 21, the pressure sensor 2, the elastic body 1, etc., the elastic body 1 and the sensor in the state of FIG. It is possible to avoid contact of the surface 2a.

According to the first and second embodiments of the occlusion detection device of the present invention described above, the following effects can be exhibited.
That is, the position where the tube T is positioned when detecting the blockage is the flat surface of the elastic body 1, so that even if, for example, leakage infusion from above travels through the tube T and reaches the positioning position (surface) of the tube T , It does not adhere firmly and remains on the part, and it is hard to get dirty. Cleaning becomes extremely easy even if it gets dirty.
The pressure sensor 2 is provided on the back side of the elastic body 1 and is not in direct contact with the tube T. Therefore, dirt due to leakage infusion does not adhere to the sensor surface 2a of the pressure sensor 2, and cleanliness is maintained. In addition, it is possible to prevent occurrence of a detection error due to adhesion of dirt on the sensor surface 2a.
When the occlusion detection device is applied to a medical device, a structure that tends to become dirty must be avoided, and the occlusion detection device of the present invention is extremely useful in this respect.
Furthermore, since the pressure sensor 2 has a gap Δg on the back surface of the elastic body 1 and the sensor surface 2a is disposed opposite to the pressure sensor 2, even if variations in the position, thickness, etc. of the elastic body 1 or the pressure sensor 2 occur, they can be absorbed. It is possible to prevent a decrease in measurement accuracy. Furthermore, the blockage detection device of the present invention does not require a movable mechanism as in the prior art, and the blockage detection component can be easily downsized.
In particular, according to the second embodiment of the blockage detection device of the present invention, the elastic body 1 can be removed and cleaned as a cartridge-type elastic body 12 that can be attached and detached together with the frame body 11 or to a new elastic body 1. Can be remarkably simplified. Even when the elastic body 1 is damaged, it is only necessary to replace the cartridge-type elastic body 12 in the same manner.

Next, 1st Embodiment of this invention infusion apparatus provided with the obstruction | occlusion detection apparatus mentioned above is described based on FIGS.
In FIG. 9, reference numeral 81 denotes a housing having a handle 82 on the upper surface. The casing 81 accommodates an infusion device main body including an unillustrated driving means, control means, data processing means, alarm means, and the like related to the operation of the pump mechanism P and the infusion device of the present invention, an occlusion detection device 60, and the like. . The alarm means includes a display device 64 that displays an alarm message and the like and a warning sound generator 65 that generates a warning sound when a blockage of the tube (infusion tube) T is detected.

  On the front surface of the housing 81, the left half forms an operation panel surface 83. A pump mechanism arrangement surface 84 is formed at a position retracted to the back side of the right half, and the pump mechanism P and the pressure sensor 2 of the blockage detection device 60 are arranged on the pump mechanism arrangement surface 84. The pressure sensor 2 is located immediately below the pump mechanism P.

Tube guides 85 are provided at a plurality of locations in the vertical direction of the pump mechanism arrangement surface 84, here, at three locations. The tube guide 85 guides and holds the tube T passed in the vertical direction through the surface side of the pump mechanism P and the pressure sensor 2 portion to a fixed position.
The casing 81 is provided with a door 86 that covers the pump mechanism arrangement surface 84. The door 86 can be opened and closed by a hinge 87.
A tube pressing plate 89 is attached to the back surface of the door 86. The tube pressing plate 89 is a pressing member that causes the tube T to be in close contact with the surface of the pump mechanism P when the door 86 is closed, so that the liquid feeding operation is normally performed.
The operation panel surface 83 on the left side of the front surface of the housing 81 has a plurality of power switches, a liquid feeding start switch, a liquid feeding stop switch, a forced stop switch, a warning sound / warning message stop switch, and the like for operating the infusion device of the present invention. A switch (switch group 88) is provided. In addition, a display device 64, a warning sound generating device 65, and the like are also provided, and various operation states and operation states of the infusion device of the present invention, warning sound generation, warning message display, and the like are possible.

  In the first embodiment of the infusion device of the present invention, the occlusion detection device shown in FIG. That is, the elastic body 1 is a thin sheet integrated with the chassis portion 21 of the blockage detection device 60 (when used as the chassis portion of the infusion device, the chassis portion of the infusion device; hereinafter referred to as the device chassis portion) 21. The obstruction | occlusion detection apparatus formed in this is used.

FIG. 10 is an exploded perspective view showing a specific example of the blockage detection device 60 used in the first embodiment of the infusion device of the present invention. As shown in this figure, the tube presser 3 of the blockage detection device 60 has four legs. A tube pressing body 3a provided with 3b and a coil spring 3c are provided.
The tube retainer 3 is provided on the back surface of the door 86 as shown in FIG. 9, and the door 86 is closed in a state where the tube T is attached to the infusion device of the present invention as shown by a two-dot chain line in FIG. At the time, the tube T, the elastic body 1, and the sensor surface 2a of the pressure sensor 2 are brought into close contact as follows. That is, the tube pressing body 3a is urged from the door 86 side to the pressure sensor 2 side by the coil spring 3c, and the tube T is applied to the elastic body 1 with a predetermined pressing force, and the elastic body 1 is also connected to the sensor surface 2a of the pressure sensor 2. [See FIG. 11 and FIG. 1 (a)]. Due to this close contact, the external deformation due to the change in the internal pressure of the tube T, that is, the blockage of the tube T can be normally detected by the pressure sensor 2.
The leg 3b of the tube retainer 3 abuts against the front of the device chassis (pump mechanism placement surface 84) when the door 86 is closed, and the horizontal posture of the tube retainer main body 3a and the crushing rate of the tube T are kept constant. The adhesion between the tube T, the elastic body 1 and the sensor surface 2a of the pressure sensor 2 is maintained.
The tube retainer 3 is formed with a protrusion 3d. When the door 86 is open, a stopper (not shown) provided on the door side and the protrusion 3d come into contact with each other, so that the tube retainer body 3a is coil spring. It is prevented from popping out and leaving by 3c.
Note that the form of the tube retainer 3 is not limited as long as the distance between the tube T and the pressure sensor 2 is reduced, and either the position of the tube T or the pressure sensor 2 is displaced. It doesn't matter.

Next, 2nd Embodiment of the infusion apparatus provided with the obstruction | occlusion detection apparatus is described based on FIGS.
In the second embodiment, a blockage detection device having the form shown in FIG. 3 is used as the blockage detection device 60. That is, the sheet-like elastic body 1 is bonded and fixed to the flexible frame 11 that can be detachably incorporated into the apparatus chassis portion 21 via the frame-like double-sided tape 31, and the frame 11 as a cartridge-type elastic body 12. In addition, a blockage detection device that can be removed or replaced is used (see FIGS. 12 to 14).
As shown in FIG. 14, the frame 11 has convex portions 11 a formed on three sides excluding the upper side of the quadrilateral shape. Further, as shown in FIGS. 15 and 16, a groove portion 22a is formed at a position corresponding to the convex portion 11a of the concave portion 22 formed in the apparatus chassis portion 21 (pump mechanism arrangement surface 84) shown in FIG. ing.

In such a configuration, the elastic body 1 as a constituent member of the blockage detection device 60 is incorporated as follows.
First, the frame 11 (see FIGS. 13 and 14) is pushed into the recessed portion 22 shown in an enlarged manner in FIGS. 15 and 16 while being bent. Then, the convex portions 11 a (three locations) formed on the frame body 11 are respectively fitted into the groove portions 22 a (three locations) formed on the recessed portion 22, and the cartridge-type elastic body 12 is attached to the device chassis portion 21. (FIGS. 17 and 18), and incorporated as the elastic body 1 of the occlusion detection device 60 in the recessed portion 22.
When the elastic body 1 is removed from the recessed portion 22 when the elastic body 1 is replaced, as shown in FIG. 19, the lower side of the quadrilateral frame 11 of the cartridge-type elastic body 12 mounted on the apparatus chassis portion 21 is used. What is necessary is just to hang a fingertip etc. to the near side notch 11b formed in the center part, and to pull it forward. Thereby, the elastic body 1 is removed from the recessed portion 22 together with the frame body 11 as the cartridge-type elastic body 12, and can be replaced with a new elastic body 1 (cartridge-type elastic body 12).
Reference numeral 23 in FIGS. 15 to 19 denotes a concave groove for guiding a fingertip or the like to the notch 11b of the frame body 11 when the elastic body 1 is replaced.
Other configurations are substantially the same as those of the first embodiment of the infusion device of the present invention described above.

In the first and second embodiments (FIGS. 9 and 12) of the infusion device described above, the tube T is held by the tube guide 85, positioned on the pump mechanism P and the pressure sensor 2, and the door 86 is closed. Thus, the switch group 88 on the operation panel surface 83 is operated, and the liquid feeding operation by the pump mechanism P is started. In FIGS. 9 and 12, an arrow in a two-dot chain line added in the tube T indicates a state of the infusion being delivered.
When the blockage detection device 60 detects the blockage of the tube T during the liquid feeding operation, the pump mechanism P automatically stops and safety is achieved. In addition, a warning sound is generated from the warning sound generator 65 and a warning message is displayed on the display device 64, so that the operator knows that the tube T has been blocked.

According to the first and second embodiments of the infusion device of the present invention described above, since the tube positioning portion is the flat surface of the elastic body 1 when detecting the blockage, the leaked infusion or the like firmly adheres to and remains on the portion. There is nothing and it is hard to get dirty. Cleaning becomes extremely easy even if it gets dirty. Further, since the pressure sensor 2 is not in direct contact with the tube T, dirt due to leakage infusion or the like does not adhere to the sensor surface 2a of the pressure sensor 2, and cleanliness is maintained. Therefore, it is possible to prevent the occurrence of detection errors due to the adhesion of dirt to the sensor surface 2a, and there is a great effect when applied to medical use. Further, there is an effect that the movable detection mechanism as in the prior art is not required and the blockage detection component can be easily reduced in size. In particular, according to the second embodiment of the infusion device of the present invention, there is an effect that the replacement of the elastic body 1 of the blockage detection device 60 can be remarkably simplified.
9 and 12, the blockage detection device 60 is provided only on the downstream side of the pump mechanism P, but may be provided only on the upstream side or on both the upstream side and the downstream side. .

  1: elastic body, 2: pressure sensor (strain gauge), 2a: sensor surface, 3: tube press (flow path press), T: tube (flow path, tubular body), Δg: gap.

Claims (7)

In an infusion apparatus having a pump mechanism for elastically deforming a flow path having flexibility and delivering a liquid, a pressure sensor whose sensor surface is deformed by expansion of the flow path is used on the upstream and downstream sides of the pump mechanism . An apparatus for detecting blockage of the flow path,
So that the flow path on the surface during occlusion detection faces the sensor surface with a predetermined gap on the back surface is positioned, the sensor surface expansion of the flow channel is interposed between the flow path and the sensor surface A sheet-like or film-like elastic body to be transmitted to
The flow path positioned on the surface of the elastic body in the state of detecting the blockage of the flow path is brought into close contact with the elastic body surface with a predetermined pressing force, and the change in the internal pressure of the flow path is applied to the sensor surface of the pressure sensor. A blockage detecting device comprising: a flow path pressing member that is transmitted through the elastic body. The blockage detection apparatus according to claim 1, wherein a predetermined channel positioning region on the surface of the elastic body is formed flat or curved without unevenness.   The blockage detection apparatus according to claim 1, wherein the elastic body is fixed to the frame body and is detachable together with the frame body.   The blockage detection device according to claim 1, wherein the pressure sensor is a strain gauge that detects an external deformation of the flow path in the blockage detection state.   The blockage detection device according to any one of claims 1 to 4, wherein the gap has a predetermined value of 0.5 mm or less. The elastic body, the thickness of that is 0.05mm or more, occlusion detection system according to any one of of the preceding claims 1 to 5, wherein the at 0.5mm or less.   An infusion device comprising the blockage detection device according to any one of claims 1 to 6, wherein the flow path is an infusion tube.