JP2016182329A - Portable drip infusion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drip infusion device for drip infusion with a pressure etc. applied to an infusion solution bag, which continues drip infusion stably and is convenient for portable use without the occurrence of an excessive pressure or the suspension of the infusion due to a failure, a battery exhaustion, running out of gas, etc. unlike a case of using a pump or a gas cylinder.SOLUTION: A bellows (6) is incorporated in a pressure cylinder (1) and shrunk with the force of a hoist (35) using a weight (10) or a spiral spring as load applying means, to increase an internal pressure. The pressure is introduced to a well-closed vessel (2) or an expansion bag (23), and an infusion solution bag (11) is pressurized with a constantly suitable force of the pressure or expansion force to discharge a chemical solution in the bag.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medical device, and more particularly to an infusion device that can move along with a body.

  In general drip used for medical treatment of patients in hospitals, etc., use a drip stand, set the drip bag at a position higher than the injection position, and inject the drug solution into the patient's vein by the lift pressure due to the drop. Yes. There is no problem with this method when sleeping on the bed, but if the patient needs to move on foot during the infusion, it must move with the infusion stand. To cope with such cases, the drip stand has 4 or 5 feet on the installation part, and each foot has a free wheel so that the patient can move while pushing the drip stand by hand. It has become.

  However, this system limits the free movement of the patient away from the bed, and is disturbing even when moving within a limited range. Therefore, it was also a cause to make hospitalization more depressed. In order to solve this problem, it is necessary to provide a portable infusion device that eliminates the need to move the infusion container while hanging on a hanger when leaving the bed, and a jacket for holding the infusion device. There is an apparatus shown in 3260115. In this apparatus, an infusion container is placed in a pressurization bag, air is sent into the pressurization bag by an air pump to increase the air pressure in the pressurization bag, and the chemical solution in the infusion container is pushed out. The device further includes a pressure setter for keeping the pressure constant.

  As another means for solving the above problem, there is an apparatus shown in JP-A-10-295810. In this apparatus, compressed gas sealed in a gas cylinder is introduced into a pressurized bag, the drug solution bag is pressed by the expansion force of the pressurized bag, and the drug solution is pushed out.

  Japanese Patent Laid-Open No. 60-220071 discloses another problem to solve the above problem. In this device, a squeezable bag is placed in a movable compartment, and the compartment is squeezed by the force of a spiral spring to press the bag and push out the chemical solution in the bag.

Japanese Patent No. 3260115 JP-A-10-295810 JP-A-60-220071

  The apparatus shown in Patent Document 1 is provided with an air pump and a pressure setting device, and the cost increases. In addition, there is a problem that the apparatus becomes heavy to provide these accessory parts, and the burden increases when the patient moves. Furthermore, it is necessary to incorporate complicated circuits, parts, and software for the control of the pressure setting device. If an abnormality occurs in these, the pressure applied to the infusion container becomes too high, and the infusion flow rate exceeds the appropriate range. However, there is a problem in that a situation in which the patient is put into a dangerous state may occur. Furthermore, in order to carry the apparatus, it is necessary to incorporate a battery for controlling the pressure setting device, and the battery has to be replaced or charged every time it is used a certain number of times. Further, if the replacement or charging is neglected, there is a risk that the drip may stop in the middle due to power shortage.

  The apparatus disclosed in Patent Document 2 requires a highly accurate decompression device when the gas sealed in the cylinder is at a high pressure, and if the decompression device fails and high pressure gas is introduced into the pressure bag. The problem was that the amount of chemicals flowing out increased rapidly and could endanger the patient's body. In order to avoid this problem, when the gas sealed in the cylinder is low pressure, the gas pressure gradually decreases as the gas is introduced into the pressurization bag. There was a problem in that the instilled drip could not be sustained. In addition, the gas cylinder must be replaced every time it is used a certain number of times. Further, if the cylinder was not replaced, there was a risk that the drip would stop midway due to lack of gas.

  The device shown in Patent Document 3 requires a bag suitable for this, and a flat-type gravity drop type infusion bag generally used in a suspended state cannot be used. The reason is that the infusion bag is different from the shape of the compartment and does not crush easily. That is, since the bag collapses irregularly, the pressure of the infusion solution to be delivered may increase or decrease, which may pose a danger to the patient's body. In addition, there is no infusion bag suitable for this device at present. This device is not designed to use the existing infusion bags.

  The present invention has been made to solve the above problems. In the present invention, pressure is applied to the infusion bag to push out the chemical solution, and for that purpose, the infusion bag is placed in a pressurized container and the gas pressure is used as the pressurizing means. However, in the present invention, a hermetic bellows that expands and contracts vertically is used as means for feeding air into the pressurized container. The force for expanding and contracting the bellows is a load generated by a weight or spiral spring placed on the upper surface. The weight or load increases the air pressure in the bellows in an attempt to shrink the bellows. This air pressure or a bag that is inflated by the air pressure presses the infusion bag and pushes out the medicine inside.

  As a method of directly acting the air pressure, by connecting the inside of the bellows and the sealed container containing the infusion bag, the pressure in the sealed container is increased, and the drug solution can be pushed out by pushing the inside infusion bag. In addition, as an infusion bag pressing means, a flexible and sealed expansion bag with elasticity that is installed next to the infusion bag in a container that houses the infusion bag can also be used. The inside of the bellows communicates with the inflatable bag, and the medicinal solution is pushed out by pressing the infusion bag by an inflating force due to an increase in the internal pressure of the inflatable bag.

  Using a spiral spring as a means for generating a load is similar to Patent Document 3. However, in the present invention, the load of the spiral spring is transmitted to the sealed bellows that expands and contracts. It is in communication, and the infusion bag is pressed by the expansion force due to the internal pressure increase of the expansion bag to push out the drug solution.

  According to the present invention, since an air pump and a pressure setting device, or a gas cylinder and a pressure reducing device are not used, the cost can be reduced. Since the air pressure to be generated is low, even a method using a weight as a load application means requires a light weight, and a method using a string wound on a reel of a hoisting device incorporating a spiral spring as a load application means further reduces the weight. be able to. Since it is not necessary to use a pressure setting device or a pressure reducing device, the mass of the entire device can be reduced. The pressure generated in the bellows is a pressure corresponding to the weight of the weight or a pressure corresponding to the rotational force of the reel by the spiral spring, and does not become higher than that. Therefore, abnormal pressure is not generated and the infusion flow rate is increased, so that the patient is not at risk. Since there are no parts that need to be replaced or recharged, such as batteries and gas cylinders, the complexity is eliminated. In addition, there is no trouble that the drip stops in the middle due to power shortage or gas shortage. Moreover, since there are few parts of an apparatus, it becomes compact and lightweight, it becomes easy for a patient to wear and move, and a burden is also lightened. Moreover, since it is made so that the general infusion bag normally used as a gravity dripping type | formula may be used, it is not necessary to make the bag of a special shape according to an apparatus.

It is a top view of Example 1 of the present invention. It is a front view which shows the cross section cut by the dashed-dotted line of FIG. It is a top view of Example 2 of the present invention. It is a front view which shows the cross section cut by the dashed-dotted line of FIG. It is side surface sectional drawing of the pressurization cylinder of Example 3 of this invention. It is a front view of the pressure cylinder of Example 3. It is sectional drawing of Example 4 of this invention. 6 is a top view of Example 4. FIG. 6 is a front view of a pressure cylinder of Example 4. FIG. It is sectional drawing of Example 5 of this invention.

  An embodiment of the present invention will be described with reference to FIGS.

  1 and 2 show Embodiment 1 of the present invention. FIG. 1 is a view of the apparatus as viewed from above, in which a pressure cylinder 1 and an airtight container 2 are integrated by a connecting plate 21. A drip tube 3 is attached to the airtight container 2. From the center of the upper surface of the pressure cylinder 1, a wire 4 connected to the internal weight 10 comes out and is connected to the pulling knob 5. An airtight door 2 </ b> A that can be opened and closed and maintains airtightness when closed is provided on the front surface of the airtight container 2. The airtight door 2 </ b> A is provided to open and close when the infusion bag 11 is taken in and out of the airtight container 2. A shoulder strap 20 is attached to the upper part of the integrated apparatus main body so as to be attached to the body and movable.

  FIG. 2 is a front view of a cross section of the device taken along the dashed line in FIG. A bellows 6 attached to a bottom plate 7 and hermetically sealed is provided inside the pressure cylinder 1. The bellows 6 is made of a soft material, and it is desirable that the bellows 6 itself has almost no spring property. The bottom plate 7 which is a fixed end has a vent hole 8 and further communicates with the airtight container 2 through a communication pipe 9. A weight 10 is placed on the upper surface, which is the free end of the bellows 6. The weight 10 is a disk shape having a diameter slightly smaller than the inner diameter of the pressure cylinder 1 so that the inside of the pressure cylinder 1 can freely move up and down.

  An infusion bag 11 is suspended in the airtight container 2. One end of the conduit tube A12 is connected to the lower part of the infusion bag 11, and the other end is connected to the upper part of the drip tube 3. The conduit tube A12 penetrates the hermetic container 2 on the way, and a seal bush 13 is attached to the penetrating portion. The seal bush 13 is in close contact with both the hermetic container 2 and the conduit tube A12, and maintains the hermetic state of the hermetic container 2 so that the internal pressure does not leak to the outside.

  A liquid breakage occluder 14 is attached to the lower part of the drip tube 3 via a conduit. A float valve 15 is enclosed in the liquid breaker 14 so that the flow path is opened when the float valve 15 is floating, and the flow path is blocked when the float valve 15 is seated in the lower part. It is. Further, a clamp 16 is attached via a conduit. The clamp 16 has a flow rate adjusting knob 17. A conduit tube B18 is connected to the lower part of the clamp 16 and the tip is connected to a drip injection needle (not shown). A check valve 19 is attached to the bottom plate of the airtight container 2.

  The operation of this embodiment will be described. First, the airtight door 2A is opened, the infusion bag 11 is set in the airtight container 2, one end of the conduit tube A12 is connected to the infusion bag 11, and the airtight door 2A is closed. The other end of the conduit tube A12 passes through the seal bush 13 and is already connected to the drip tube 3. The flow rate adjustment knob 17 of the clamp 16 is set to close the flow of the chemical solution. In this state, the wire 4 is pulled up with the pull knob 5. Then, the weight 10 connected to the wire 4 is pulled up. The weight 10 and the upper surface of the bellows 6 are bonded, or the bellows 6 is elastically extended when the load is removed. Since the bellows 6 extends, the internal volume increases and the pressure decreases. Therefore, the bellows 6 sucks air from the vent 8 and the pressure in the hermetic container 2 also decreases. Then, the check valve 19 is opened and air is sucked into the airtight container 2 from the outside. Therefore, both the inside of the bellows 6 and the inside of the airtight container 2 are maintained at almost atmospheric pressure. When the weight 10 is pulled up until the volume in the bellows 6 becomes larger than the volume of the drug solution in the infusion bag 11, the pull knob 5 is released.

  The weight 10 tries to push down the bellows 6 by its own weight. The pressure in the bellows 6 increases by a value commensurate with the force. As a result, the pressure in the airtight container 2 communicating with the vent hole 8 through the communication pipe 9 is also increased. Since the check valve 19 is configured to close the leakage of air from the inside to the outside, the pressure in the airtight container 2 is maintained. Due to this pressure, the infusion bag 11 is given a contraction force, and therefore receives a force that pushes the internal chemical solution outward. In this state, although not shown in the figure, an actual infusion device has a device for extracting air from the flow path, etc., and after bleeding air from the conduit tube B18, etc., a hemostatic band is formed on the patient's arm. Then, a series of medical procedures are performed such that an injection needle (not shown) attached to the end of the conduit tube B18 is inserted into the patient's vein and the hemostatic band is removed. Thereafter, the flow rate adjustment knob 17 of the clamp 16 is gradually turned to open the flow path, and the flow rate is adjusted so that the chemical solution is dropped into the drip tube 3 at appropriate intervals.

  The mass of the weight 10 is set so that the pressure in the bellows 6 corresponds to the water column head of the drop between the liquid level of the infusion bag 11 and the drip site in drip by normal gravity. The elasticity of the bellows 6 is made to be negligible compared to the mass of the weight 10, and the pressure in the bellows 6 and the hermetic container 2 is kept almost constant. Therefore, the drip can be maintained at a stable flow rate in the same manner as a normal gravity drip.

  When the inside of the infusion bag 11 is completely filled with liquid and no air is contained, the infusion is finished when the infusion bag 11 is squeezed out. However, when air is mixed in the infusion bag 11, if the drip is continued until it is deflated, the air is pushed into the patient's body, which may cause a dangerous situation of air embolism in the patient. In order to prevent this, a liquid breakage obturator 14 is provided between the drip tube 3 and the clamp 16. A float valve 15 is enclosed in the liquid breaker 14. The specific weight of the float valve 15 is made smaller than the specific weight of the chemical solution. When the container is filled with the liquid, the float valve 15 is lifted and the flow path is opened. Therefore, the flow path is blocked by being seated on the bottom. With this mechanism, even if air is mixed into the infusion bag 11, the flow of the liquid stops when the liquid runs out in the liquid breakage occluder 14, so that the drip is completed and the patient is not put at risk.

  The pressurizing cylinder 1 and the airtight container 2 are integrated with a connecting plate 21, and the drip cylinder 3 is also integrated therewith, so that the liquid breakage occluder 14 and the clamp 16 are attached to the main body. . Therefore, if this apparatus is worn by a patient, the user can go anywhere and can go up and down the stairs without being inconvenienced to move while pushing the drip stand as in the past. Therefore, in the embodiment, a shoulder strap 20 is attached to the upper portion so that the apparatus can be moved from the shoulder. However, the method of wearing is not limited to the shoulder strap, but it may be a belt type that can be worn on the waist, a rucksack type that can be carried on the back, or can be put on the front.

  3 and 4 show a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, a storage container 22 having an open upper surface is used instead of the airtight container 2 of the first embodiment. FIG. 3 is a top view of the apparatus. An inflatable bag 23 is provided in the storage container 22, and the infusion bag 11 is stored alongside this. The drug solution outlet at the bottom of the infusion bag 11 and the drip tube 3 are connected by a conduit tube A12.

  4 is a side view of a cross section of the device taken along the alternate long and short dash line in FIG. An inflatable bag 23 and an infusion bag 11 are set in parallel in the storage container 22. The inflatable bag 23 is made of a flexible material and has a sealed bag shape. The inflatable bag 23 is inflated in the lateral direction of the drawing when pressure is introduced into the inside. The expansion bag 23 is connected to the lower part of the pressurizing cylinder 1 by the communication pipe 9. The lower part of the pressurizing cylinder 1 communicates with the inside of the bellows 6 through the vent hole 8. Therefore, the inside of the bellows 6 and the inside of the expansion bag 23 communicate with each other. In this embodiment, the drip tube 3 is attached to the pressure tube 1.

  The operation of this embodiment will be described. One end of the conduit tube A12 is connected to the infusion bag 11. The other end of the conduit tube A12 is already connected to the drip tube 3. The flow rate adjustment knob 17 of the clamp 16 is set to close the flow of the chemical solution. The pulling knob 5 is pulled up, and the weight 10 connected by the wire 4 is pulled up. The weight 10 and the upper surface are bonded, or the bellows 6 that extends by itself is extended to increase the volume inside. As a result, the inflatable bag 23 releases air as much as the bellows 6 sucks air, so that the inflatable bag 23 is deflated and a space is formed between the wall of the storage container 22. The infusion bag 11 is inserted into the space. Then release the pull knob 5.

  The weight 10 tries to push down the bellows 6 by its own weight. The pressure in the bellows 6 increases by a value commensurate with the force. As a result, the pressure in the expansion bag 23 communicating with the vent hole 8 through the communication pipe 9 also increases. Due to this pressure, the inflatable bag 23 is inflated and the infusion bag 11 is compressed, so that it receives a force that pushes the chemical solution inside. Subsequent procedures and operations are the same as those in the first embodiment.

  5 and 6 show a third embodiment of the present invention. The present embodiment relates to the pressurizing cylinder 1, and other portions are the same as those in the first embodiment or the second embodiment, and illustration and description thereof are omitted. FIG. 5 shows a side sectional view of the pressure cylinder 1. The pressure cylinder 1 is provided with a slide guide 24 and a slide knob 25, and the slide knob 25 can move up and down along the slide guide 24. The slide knob 25 and the weight 10 are connected by the wire 4 via the pulley 26. If the slide knob 25 is pulled down, the weight 10 is pulled up. Except for the mechanism for pulling up the weight 10, the procedure is the same as in the first or second embodiment, and the procedure and operation are the same as in the first or second embodiment.

  FIG. 6 shows a front view of the pressure cylinder 1. The slide guide 24 is provided with a scale plate 27 so that the position of the scale can be read by a mark such as a protrusion of the slide knob 25. The scale is struck so as to match the amount of air flowing out of the bellows 6. If the slide knob 25 is first lowered to the scale 0, the amount of air pushed out from the bellows 6 can be read as the weight 10 is lowered, and this amount of air matches the amount of medicine pushed out from the infusion bag 11. With this structure, the injection amount and remaining amount of the chemical solution can be known.

  7 to 9 show a fourth embodiment of the present invention. FIG. 7 is a cross-sectional view of the fourth embodiment. In this embodiment, the means for applying a load to the bellows 6 in the pressure cylinder 1 is different from those in the first and second embodiments. An upper end that is a fixed end of the bellows 6 is fixed to the top plate of the pressure cylinder 1 in a sealed state. A bottom plate 28 is attached in a sealed state to the lower end, which is the free end of the bellows 6. Since the bottom plate 28 is not restrained, the lower end of the bellows 6 can move up and down together with the bottom plate 28. Pulleys 29 are attached to both ends of the bottom plate 28, and a string 30 having one end fixed to the top plate of the pressure cylinder 1 is hung on the pulley 29. A hoisting device 35 is installed on the upper surface of the pressure cylinder 1. A reel 38 is attached to the inside of the case 36 of the hoisting device 35 so as to rotate while being supported by the shaft core 37. A spiral spring 39 is provided with the center side fixed to the reel 38 and the outer peripheral side fixed to the case 36. The string 30 is wound around the reel 38 for a necessary length. The spiral spring 39 is deformed and attached so as to give a rotational force to the reel 38.

  A wire 4 is joined to the center of the bottom plate 28, and the wire 4 is joined to the slide knob 25 via a pulley 26. The slide knob 25 can move up and down along the slide guide 24. When the slide knob 25 is pulled up, the bottom plate 28 is pulled down, the string 30 is unwound from the hoisting device 35, the reel 38 rotates, the spiral spring 39 further deforms, and the bellows 6 extends.

  A storage container 22 that is integrated with the pressure cylinder 1 and has an open upper surface is provided. FIG. 8 is a view of the apparatus from above, and an inflatable bag 23 is provided in the storage container 22, and the infusion bag 11 is stored on top of this. An air vent 32 is provided in the upper portion of the pressurizing cylinder 1 and communicates with the inflating bag 23 through a communication pipe 34. The drug solution outlet at the bottom of the infusion bag 11 and the drip tube 3 are connected by a conduit tube A12.

  FIG. 9 shows a front view of the pressure cylinder 1. A scale plate 27 is provided along the slide guide 24 so that the position of the scale can be read by a mark such as a protrusion of the slide knob 25. The scale is struck so as to match the amount of air flowing out of the bellows 6.

  The operation of this embodiment will be described. When the slide knob 25 is first lifted up, a latch (not shown) is applied, and the inflatable bag 23 remains in a contracted state. Therefore, the infusion bag 11 is stored in the inflated bag 23 in this state. Set in the gap between containers 2. Thereafter, when the latch is released, the string 30 pulls up the bottom plate 28 by the pulling load of the hoisting device 35, and the bellows 6 is contracted, so that the internal pressure rises. The pressure causes the inflatable bag 23 to inflate, tightly press against the infusion bag 11, and start the discharge of the chemical solution. Subsequent procedures and operations are the same as those in the first embodiment.

  As the infusion progresses, the bellows 6 shrinks, and the string 30 is wound around the hoisting device 35. The scale plate 27 is slidable. When the scale 0 is set to the mark of the slide knob 25 at the start of the injection of the chemical solution, the scale when the slide knob 25 is moved represents the amount of air pushed out from the bellows 6. Since the amount of air coincides with the amount of the chemical liquid pushed out from the infusion bag 11, the injection amount and remaining amount of the chemical liquid can be known.

  FIG. 10 shows a fifth embodiment of the present invention. In the present embodiment, the lower ends of the two strings 30 are coupled to both ends of the bottom plate 28, and the upper ends are wound around the reel 38 of the hoisting device 35 both outside the pressurizing cylinder 1. The pulley 31 is provided so that the string 30 does not rub against the pressure cylinder 1 directly to cause friction or wear. In this embodiment, the bottom plate 28 rises as the two strings 30 are evenly wound around the hoisting device 35.

An airtight container 2 is installed integrally with the pressure cylinder 1. A vent hole 32 is provided at the upper part of the pressure cylinder 1, and a vent hole 33 is provided at the upper part of the airtight container 2, and these communicate with each other via a communication pipe 34. An infusion bag 11 is suspended in the airtight container 2. The drug solution outlet at the bottom of the infusion bag 11 and the drip tube 3 are connected by a conduit tube A12. The portion where the conduit tube A12 penetrates the hermetic container 2 is kept airtight by the seal bushing 13. The bottom plate of the airtight container 2 is provided with a check valve 19 that does not leak air from the inside to the outside but allows air to flow from the outside to the inside.

  The operation of the present embodiment is the same as that of the fourth embodiment for the pressure cylinder 1 and the same as that of the first embodiment for the airtight container 2. The procedure and operation after the start of the discharge of the chemical solution are the same as in the first embodiment.

  According to Example 4 or 5, since the hoisting device 35 that is lighter than the weight is used as means for applying a force to the bellows 6, the mass of the device can be reduced accordingly. Therefore, the burden when the patient wears and moves is further reduced.

DESCRIPTION OF SYMBOLS 1 Pressurization pipe | tube 2 Airtight container 3 Infusion pipe | tube 5 Pulling knob 6 Bellows 10 Weight 11 Infusion bag 14 Liquid breaker 15 Float valve 16 Clenme 17 Flow control knob 19 Check valve 23 Expansion bag 24 Slide guide 25 Slide knob 27 Scale plate 35 Hoisting device 38 Reel 39 Spiral spring

Claims (7)

  Consists of an infusion bag, conduit tube, clamp, drip tube, injection needle, etc. In a device that performs intravenous drip injection as a medical treatment, the container that houses the infusion bag, one end is a fixed end, and the other end is freely extendable The vent is provided at the fixed part of the bellows, which has a pressure cylinder that houses the bellows that is the end and contains the sealed bellows, pressurizes the free end of the bellows by load applying means, and raises the air pressure in the bellows. A portable infusion device, wherein the infusion bag is communicated with an infusion bag pressing means, and the infusion bag is contracted by the pressing means to push out an internal drug solution.   The load applying means is a weight that is housed in a pressure cylinder and can move up and down freely. The weight is placed on the upper surface of the bellows with the lower end fixed, and the weight pressurizes the bellows by its own weight to increase the air pressure in the bellows. The portable infusion device according to claim 1.   2. The infusion bag compressing means is an airtight container for storing an infusion bag, wherein the vent and the inside of the airtight container are in communication, and the infusion bag is compressed by an increase in pressure in the airtight container. The described portable infusion device.   A part of the airtight container is provided with a check valve that allows air to flow into the airtight container from the outside, but blocks air from flowing out of the airtight container to the outside. The portable infusion device according to claim 3.   The infusion bag compression means is a flexible and sealed expansion bag that is flexible and sealed and is placed in a container for storing the infusion bag, and the vent and the expansion bag communicate with each other. The portable infusion device according to claim 1, wherein the infusion bag is compressed by an expansion force due to an increase in the internal pressure.   A float valve is built in the container in a part of the flow path, and when the liquid is filled in the container, the float valve is lifted by buoyancy to open the flow path, allowing the fluid inside to flow down, 2. The portable infusion device according to claim 1, further comprising a liquid breakage occluder that prevents the fluid from flowing down by closing the flow path by dropping the float valve by its own weight.   The load applying means is a hoisting device in which a rotational force is generated in the reel by a restoring force of the spiral spring, the rotational force of the reel is transmitted to a string wound around the reel, and the load of the string is transmitted to the free end of the bellows. The portable infusion device according to claim 1, wherein the load is a load that acts on the bellows to contract the bellows.

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