JP2019217204A - Portable drip device - Google Patents

Abstract

To provide a portable drip device that enables a stable drip, is compact and light-weighted, and is excellent in versatility.SOLUTION: A drip device 1 comprises a housing 2; and a piston 15 provided in the housing 2 so as to be capable of advancing toward one side in an axial direction. A drug solution bag 20 is loaded between the housing 2 and the piston 15, such that an advance of the piston 15 pushes out drug solution in the drug solution bag 20. The drip device includes in the housing 2: a spiral spring 6 that is elastically deformable; a deceleration gear mechanism 7 that decelerates repulsive force of the spiral spring 6 before outputting the repulsive force; a screw shaft 10 that rotates using drive force output from the deceleration gear mechanism 7; a sliding part 11 that is screwed with the screw shaft 10 and relatively moves while sliding on the shaft; and a link shaft 16 that couples the sliding part 11 with the piston 15. The link shaft 16 is configured to cause the piston 15 to advance interlockingly with movement of the sliding part 11 on the screw shaft 10.SELECTED DRAWING: Figure 1

Description

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

  2. Description of the Related Art Conventionally, an intravenous drip performed in a hospital or the like is performed by using an infusion stand and setting a drug solution bag at a position higher than an injection device. The delivery of the drug solution in the bag utilizes gravity, and the delivery amount is adjusted by a valve or the like. Such an infusion is not particularly inconvenient when the patient is sleeping on the bed, but is inconvenient when the patient leaves the bed, because the patient needs to move together with the infusion stand. Although a drip stand with wheels is used so that the patient can move while pressing the drip stand with his hand, free movement away from the bed is restricted, making it difficult for the patient to move . These inconveniences are causing the hospitalized life to be increasingly depressed for patients.

  To cope with this, for example, a portable infusion apparatus has been proposed so that it is not necessary to move together with the infusion stand when leaving the bed (see Patent Document 1). In this apparatus, a drip container is placed in a pressurized bag, air is sent into the pressurized bag by an air pump to increase the air pressure in the pressurized bag, and the liquid medicine in the drip container is pushed out. The device is further provided with a pressure setting device for keeping the pressure constant.

  In addition, as another portable type infusion device, a compressed gas sealed in a gas cylinder is introduced into a pressurized bag via a decompression device, and the drug solution bag is pressed by the inflation force of the pressurized bag to push out the drug solution. Has been proposed (see Patent Document 2). In addition, there has been proposed an apparatus in which a spiral spring member is used as a driving source, and a sliding member is slid by shortening the spring to press a chemical solution bag (see Patent Document 3).

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

  However, the infusion device described in Patent Literature 1 is provided with an air pump and a pressure setting device, so that the cost is high, and since these accessories are provided, the entire device becomes heavy, and the burden of carrying the device is reduced. There is a possibility that it becomes larger. In addition, it is necessary to incorporate complicated circuits, parts, software, etc. into the control of the pressure setting device, and if any abnormality occurs, the pressure applied to the drip container will be too high and the drip flow rate will be appropriate. The range may be exceeded. Furthermore, the infusion device has a built-in battery for controlling the pressure setting device, and the battery needs to be replaced or charged.If the replacement or charging is neglected, the drip will stop due to insufficient power. There is a risk of doing it.

  The infusion device described in Patent Literature 2 requires a high-precision pressure reducing device when the compressed gas sealed in the gas cylinder has a high pressure. However, if an abnormality occurs in the decompression device, the amount of the drug solution flowing out of the drug solution bag sharply increases, and the drip flow rate may exceed the appropriate range. Further, when the compressed gas sealed in the gas cylinder is at a low pressure, the pressure of the compressed gas decreases as the compressed gas is introduced into the pressurized bag, so that the amount of the chemical solution gradually decreases, and there is a possibility that stable drip cannot be maintained. . Furthermore, while the gas cylinder needs to be replaced, if the replacement is neglected, the drip may be stopped halfway due to lack of gas.

  The infusion device described in Patent Literature 3 cannot use a flat chemical solution bag that is generally suspended and used, and it is necessary to use a chemical solution bag suitable for the infusion device. Since the shape of the compartment of the infusion device and the shape of the flat-shaped drug solution bag are different, when the flat-shaped drug solution bag is used, the collapse of the bag becomes irregular, and the drip flow rate may not be stabilized. There is. Therefore, the infusion device of Patent Document 3 is poor in versatility and has room for improvement in usability.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable drip infusion device that is capable of performing stable drip infusion, is compact, lightweight, and excellent in versatility.

  The portable infusion apparatus of the present invention includes a housing, and a piston provided in the housing so as to be able to advance toward one axial side, and a liquid medicine bag is mounted between the housing and the piston, and the piston A portable liquid infusion device in which the liquid medicine in the liquid medicine bag is extruded by forward movement of the liquid medicine bag, wherein the portable liquid infusion device has an elastically deformable spring member in the housing and a repulsive force of the spring member decelerated. An output reduction gear mechanism; a screw shaft that is rotated by the driving force output from the reduction gear mechanism; a sliding portion that is screwed to the screw shaft and relatively moves while sliding on the shaft; A link mechanism that connects a moving part and the piston, wherein the link mechanism is configured to advance the piston in conjunction with movement of the sliding part on the screw shaft. To.

  The link mechanism is characterized in that the moving direction of the sliding portion and the forward direction of the piston are orthogonal to each other.

  The link mechanism is characterized by comprising one or more link members.

  The sliding portion has a release mechanism for releasing a screwed state in which the sliding portion is screwed with the screw shaft.

  The sliding portion includes a sliding nut screwed to the screw shaft and a carriage to which the sliding nut is assembled. The link mechanism connects the carriage and the piston, and includes a housing. In the above, a guide shaft parallel to the screw shaft is provided between the piston and the screw shaft, and the guide shaft is inserted into the carriage, and the sliding nut moves on the screw shaft, The carriage is configured to be movable coaxially with the slide nut while sliding on the guide shaft.

  A speed control mechanism composed of an escape wheel, an ankle, and a balance is connected to the low-speed gear mechanism.

  The portable infusion apparatus of the present invention includes a screw shaft that rotates by a driving force output from a reduction gear mechanism, a sliding unit that relatively moves while sliding on the shaft of the screw shaft, a sliding unit, A link mechanism for connecting the piston, the link mechanism is configured to advance the piston in conjunction with the movement of the sliding portion on the screw axis, so the configuration of the air pump and the pressure setting device, The configuration of the gas cylinder and the pressure reducing device is not required, so that the cost can be reduced and the weight of the device can be reduced. Further, since there are no parts such as a battery and a gas cylinder which need to be replaced, the operation involved is not complicated, and there is no trouble that the drip is stopped halfway due to insufficient power or lack of gas.

  Furthermore, in the device of the present invention, the repulsive force of the elastic member is reduced by the reduction gear mechanism, and the rotational motion based on the reduced rotational force is converted into linear motion via the sliding portion, and the piston is advanced. The medical solution bag can be pressurized at a predetermined pressure. As a result, the drug solution is almost uniformly extruded, and stable drip can be performed. In addition, since each component used in the apparatus can be small, the entire apparatus is compact and lightweight, and it is easy for the patient to wear and move, and the burden can be reduced. In addition, since a general chemical solution bag used in a gravity dropping type can be stored in the housing of the device, there is no need to make a specially shaped chemical solution bag, which is excellent in versatility.

  Since the link mechanism is configured so that the moving direction of the sliding portion and the forward direction of the piston are orthogonal to each other, the entire device is compact without being elongated, and the load during movement can be further reduced.

  Since the sliding portion has a release mechanism for releasing the screwed state screwed with the screw shaft, after the drip is completed, the sliding portion in the screwed state is separated from the screw shaft and returned to the original position. The piston in the forward state can be quickly retracted. Thereby, workability at the time of exchanging the medical solution bag is improved.

  The sliding portion has a sliding nut screwed to the screw shaft and a carriage. A guide shaft parallel to the screw shaft is inserted into the carriage, the sliding nut moves on the screw shaft, and the carriage slides. Since the piston is configured to be movable in the same direction as the moving nut, the position of the piston is not easily displaced, and the chemical solution bag can be stably pressurized.

  Since the speed control mechanism including the escape wheel, ancillary wheel, and the balance is connected to the low-speed gear mechanism, the piston can be advanced at a low speed and at a predetermined speed, and the chemical can be pushed out at a speed according to the type of the chemical.

It is a schematic sectional drawing which shows an example of the portable drip apparatus of this invention. FIG. 2 is a schematic diagram showing a state before the start of infusion of the apparatus of FIG. 1. It is the schematic which shows the state after the end of infusion of the apparatus of FIG. It is the schematic for demonstrating preparation of the next infusion after completion of infusion. FIG. 9 is an axial cross-sectional view of the carriage for explaining another method of the separated state.

  An example of the portable infusion device of the present invention will be described with reference to FIG. FIG. 1 is a schematic view for easily explaining the mechanism of the device. The infusion device 1 is a portable infusion device that can be easily carried when a patient moves. This device has a mechanism in which the piston is advanced by driving a power unit and a pressurizing unit, which will be described later, to press the chemical solution bag and push out the internal chemical solution. As shown in FIG. 1, the infusion device 1 is roughly divided into a power unit 3, a pressurizing unit 4, and a bag storage unit 5, which are arranged in a housing 2 in a longitudinal direction of the device (the left-right direction in FIG. 1). Are arranged in series along. In addition, the power unit 3 can be made more compact by arranging it in parallel with the pressurizing unit 4.

  The power section 3 has a mainspring 6 as a spring member and a reduction gear mechanism 7. The mainspring spring 6 serving as a power source is connected to a dedicated screwdriver jig 8 provided outside the apparatus, and is elastically deformed by an external force applied to the screwdriver jig 8. The repulsive force generated by this elastic deformation is transmitted to the reduction gear mechanism 7 as the rotational force (drive force) of the gear. The reduction gear mechanism 7 is configured by meshing a plurality of gears having different numbers of teeth, and reduces the transmitted torque by the plurality of gears. As the gear, for example, a spur gear, bevel gear, helical gear, or the like is used. The type and arrangement of each gear in the reduction gear mechanism 7 can employ the configuration of a well-known reduction gear mechanism. The rotation of the mainspring 6 due to the repulsive force is reduced through the reduction gear mechanism 7 and transmitted to the drive gear 9. The provision of the reduction gear mechanism 7 drives the drive gear 9 to rotate at a predetermined speed.

  The spring member that can be used for the power unit 3 is not particularly limited as long as it serves as a driving source, and a coil spring or the like can be used in addition to the mainspring. The spring is more preferable because the repulsive force of the spring member is generated as a rotational force.

  The pressurizing section 4 includes a drive gear 9, a sliding screw mechanism including a screw shaft 10 and a sliding section 11, a piston 15, and a link mechanism 14 connecting the sliding section 11 and the piston 15. The drive gear 9 is integrated with the screw shaft 10, and rotates integrally with the screw shaft 10 by the driving force transmitted from the reduction gear mechanism 7. The screw shaft 10 is rotatably supported at its two axial ends by two bearings 19. The screw shaft 10 has a thread groove portion 10a in which a thread groove is formed on one end side, and no thread groove is formed on the other end side. The sliding portion 11 is engaged with the thread groove 10a.

  As shown in FIG. 1, the sliding portion 11 is arranged between the piston 15 and the screw shaft 10 in the longitudinal direction of the device. The sliding portion 11 includes a sliding nut 12 and a carriage 13, which are fixed by detachable fixing means (for example, fixing pins). A sliding surface 12a of the sliding nut 12 with the screw shaft 10 is formed in an internal thread shape, and the sliding nut 12 is screwed into a thread groove of the screw shaft 10 via the sliding surface 12a.

  Here, the sliding nut 12 does not surround the outer periphery of the screw shaft 10 but is configured to cover a part of the outer periphery of the screw shaft 10 on the piston side. The sliding nut 12 is, for example, a member obtained by dividing a sliding nut used in a general slide screw device in a circumferential direction. In the infusion device 1, the sliding nut 12 is assembled and held on the carriage 13, and the carriage 13 can move along the guide shaft 17. With this configuration, the sliding portion 11 can move while sliding on the screw shaft 10 stably with the rotation of the screw shaft 10.

  As shown in FIG. 1, the guide shaft 17 is provided between the piston 15 and the screw shaft 10 in the longitudinal direction of the device and parallel to the axial direction of the screw shaft 10. The guide shaft 17 is inserted into a through hole formed in the carriage 13. The carriage 13 is movably supported along the guide shaft 17 by two bearings 13c provided in the through holes. A stopper 18 is provided substantially at the center of the guide shaft 17 to limit the movement of the carriage 13 on the guide shaft 17. The guide shaft 17 is a member that regulates the moving direction of the sliding portion 11. The sliding nut 12 moves on the screw shaft, and the carriage 13 moves on the guide shaft 17 in the same direction. As described above, the rotational motion of the screw shaft 10 is converted into the linear motion of the sliding portion 11 by the sliding screw mechanism.

  Assembling of the sliding nut 12 in the carriage 13 will be described. An opening for accommodating the sliding nut 12 is formed in the carriage 13, and is arranged so that the opening faces the screw shaft 10. The sliding nut 12 is housed in the opening, and is fixed to the carriage 13 by the fixing pin 13a in a state where the sliding surface 12a is screwed to the screw shaft 10. The sliding portion 11 is provided with a coil spring 13b that connects the bottom surface of the opening of the carriage 13 and the end surface of the sliding nut 12 opposite to the sliding surface 12a. The coil spring 13b urges the sliding nut 12 toward the screw shaft 10.

  The link mechanism 14 includes a link shaft 16 having one end freely attached to an end of the carriage 13 and the other end freely attached to an end of a piston 15. The device of the present invention is characterized in that the link mechanism is configured to advance the piston in conjunction with the movement of the sliding portion on the screw shaft. In the configuration of FIG. 1, particularly, since the link mechanism 14 is configured so that the moving direction of the sliding portion 11 and the forward direction of the piston 15 are orthogonal to each other, the entire apparatus can be made more compact.

  In FIG. 1, a single link mechanism using one link shaft (link member) is used. However, the link mechanism may be configured to advance the piston in conjunction with the movement of the sliding portion. Or a multi-link mechanism having a plurality of joints. For example, a four-bar link mechanism can be adopted as the link mechanism.

  The bag accommodating portion 5 is a space formed between the housing 2 and one end in the axial direction of the piston 15, and accommodates the chemical solution bag 20 therein. The housing that forms the bag housing 5 is provided with a lid 2a that can be opened and closed, so that the chemical solution bag can be attached and detached. The structure is such that the chemical solution bag 20 can be sandwiched between the piston 15 and the lid 2a. In addition, a liquid feed port is formed in the lower part of the bag housing part 5, a liquid feed tube is connected to the drug solution bag 20, and a syringe needle (not shown) for infusion is connected to a tip thereof.

  As will be described later, the capacity of the bag housing portion 5 is maximum when the piston 15 is located at the bottom dead center, and is minimum when the piston 15 is located at the top dead center. Although the volume of the bag housing section 5 is not particularly limited, it is preferable that the bag housing section 5 has a capacity that can accommodate a general medical solution bag in a state where the capacity is maximized. The capacity of a general drug solution bag is, for example, 250 mL, 500 mL, 1000 mL, or the like.

  Here, the operation of the portable infusion device of the present invention will be described with reference to FIGS. FIG. 2 shows a state in which an unused chemical solution bag is mounted, and the piston is located at the bottom dead center PA. In the present invention, the position of the piston in the longitudinal direction of the device in the state where the volume of the bag housing portion is maximized is defined as the bottom dead center, and the position of the piston in the longitudinal direction of the device in the state where the volume of the bag housing portion is minimized. Dead center. FIG. 2 shows a state where the piston 15 is most retracted. In the present invention, “forward” refers to advancing the piston in a direction to protrude into the bag housing, and “retreat” refers to advancing the piston away from the bag housing.

  In the state of FIG. 2, when the mainspring spring 6 is wound up by the screwdriver jig 8, the driving force is transmitted to the driving gear 9 via the reduction gear mechanism 7. Then, the driving gear 9 and the screw shaft 10 rotate integrally, and the rotational force is converted into a horizontal moving force by the engagement of the sliding nut 12 to move the sliding portion 11 in the arrow X direction. As the link shaft 16 extends toward the chemical solution bag 20 in conjunction with the movement of the sliding portion, the piston 15 moves from the bottom dead center PA in the arrow Y direction. As a result, the drug solution bag 20 is sandwiched between the lid 2a and the piston 15, and is pressurized so that the drug solution gradually starts flowing out.

  FIG. 3 shows a state at the end of the infusion, in which the piston is located at the top dead center PB. FIG. 3 shows a state where the piston 15 is most advanced.

  In FIG. 3, the sliding nut 12 has reached the end of the thread groove portion 10a, that is, the position where the thread groove is eliminated, and is in an idling state. The carriage 13 is stopped by a stopper 18 attached to the guide shaft 17. The link shaft 16 extends substantially along the longitudinal direction of the device. The chemical liquid bag 20 is completely crushed by the piston 15, and the internal chemical liquid has been exhausted.

  Next, FIG. 4 is an explanatory diagram when the infusion on the patient is completed and the piston is quickly returned to the bottom dead center in order to perform the infusion on the next patient. After the infusion, the lid 2a is first opened, and the used drug solution bag is taken out. Thereafter, the lock between the carriage 13 and the sliding nut 12 is released, and the engagement between the sliding nut 12 and the screw shaft 10 is released. Specifically, after removing the fixing pin 13a (see FIG. 1), the coil spring 13b is elastically deformed to displace the sliding nut 12 toward the piston 15 in the longitudinal direction of the device, and the sliding surface 12a is moved from the thread groove 10a. Separate. Then, in this separated state, the sliding nut 12 and the carriage 13 are moved in the arrow Z direction. In conjunction with this movement, the piston 15 moves from the top dead center PB to the bottom dead center PA. Thereafter, the sliding nut 12 is engaged with the screw shaft 10 to lock the carriage 13 and the sliding nut 12. Specifically, the displacement of the sliding nut 12 is returned, the sliding nut 12 is urged toward the screw shaft 10 by the coil spring 13b, and the fixing nut is inserted and fixed. Then, the medical solution bag is attached, the lid 2a is closed, the mainspring 6 is screwed up and wound up by the jig 8, and the preparation for the drip operation is completed.

  Another method for separating the sliding nut from the thread groove portion to make the sliding nut separate will be described with reference to FIG. FIG. 5 is an axial cross-sectional view of a carriage in a drip device different from the drip device 1 shown in FIGS. 1 to 4. As shown in FIG. 5, the sliding surface 12a 'of the sliding nut 12' is in sliding contact with the circumferential half of the thread groove 10a 'of the screw shaft 10'. The coil spring 13b 'urges the sliding nut 12' in a direction to separate it, and the sliding surface 12a 'is engaged with the thread groove 10a'. In the configuration shown in FIG. 5, when the separated state is set, the coil spring 13 b ′ is elastically deformed (compressed), and the sliding nut 12 ′ is turned around the connection point between the sliding nut 12 ′ and the carriage 13 ′. Then, the sliding surface 12a 'is separated from the thread groove 10a'. Then, in this separated state, the sliding nut 12 'and the carriage 13' are moved along the guide shaft 17 '.

  As described above, in the infusion device of the present invention, the release mechanism that quickly retreats the piston that has reached the top dead center to the bottom dead center is provided. Specifically, the sliding nut is mounted on the carriage so as to be displaceable from a state in which the sliding nut is screwed with the screw shaft to a state in which the sliding nut is separated from the screw shaft, so that the workability when replacing the infusion bag can be improved.

  The portable infusion device of the present invention is not limited to the configuration shown in FIGS. For example, a speed control mechanism composed of an escape wheel, an ankle, and a balance may be connected to the low-speed gear mechanism 7. The speed control mechanism is a mechanism used for a timepiece or the like. By adopting this mechanism, the piston can be advanced at a low speed and at a predetermined speed. Further, by changing or switching the speed control mechanism composed of the escape wheel, ankle, and the balance, the discharge amount of the chemical can be arbitrarily adjusted, and the chemical can be pushed out at a speed according to the type of the chemical. When the medical solution bag 20 is smaller than the bag housing part 5, a spacer can be inserted between the piston 15 and the medical solution bag 20 to push out the chemical solution.

  As described above, the portable infusion device of the present invention uses the spring member and the reduction gear mechanism as the power unit, and uses the link mechanism and the slide screw device as the pressurizing unit. In this configuration, the reduction gear mechanism is driven by the reaction force of the spring member, the slide screw device is rotated, and the piston is driven by the link mechanism attached to the slide screw device, thereby pressing the infusion bag in the bag housing portion, The drug solution in the bag can be pushed out.

  INDUSTRIAL APPLICABILITY The portable infusion device of the present invention is capable of performing stable infusion, and is compact, lightweight, and excellent in versatility, so that it can be widely used as a portable infusion device, and suitably reduces the burden of moving a patient. it can.

DESCRIPTION OF SYMBOLS 1 Infusion device 2 Housing 3 Power part 4 Pressurization part 5 Bag accommodation part 6 Spring spring 7 Reduction gear mechanism 8 Screwdriver jig 9 Drive gear 10 Screw shaft 11 Sliding part 12 Sliding nut 13 Carriage 14 Link mechanism 15 Piston 16 Link Shaft 17 Guide shaft 18 Stopper 19 Bearing 20 Chemical liquid bag

Claims (6)

A housing, and a piston provided in the housing so as to be able to advance toward one side in the axial direction; a chemical solution bag is mounted between the housing and the piston; Is a portable infusion device extruded,
The portable drip apparatus includes an elastically deformable spring member, a reduction gear mechanism that reduces and outputs a repulsive force of the spring member, and a driving force output from the reduction gear mechanism in the housing. A screw shaft, a sliding portion that is screwed to the screw shaft and relatively moves while sliding on the shaft, and a link mechanism that connects the sliding portion and the piston;
The portable infusion apparatus according to claim 1, wherein the link mechanism is configured to advance the piston in conjunction with the movement of the sliding portion on the screw shaft.   2. The portable infusion device according to claim 1, wherein the link mechanism is configured such that a moving direction of the sliding portion and a forward direction of the piston are orthogonal to each other.   The portable infusion apparatus according to claim 1, wherein the link mechanism includes one or more link members.   The portable drip device according to any one of claims 1 to 3, wherein the sliding portion has a release mechanism for releasing a screwed state of the screw shaft. The sliding portion has a sliding nut screwed to the screw shaft and a carriage to which the sliding nut is assembled, and the link mechanism connects the carriage and the piston.
In the housing, a guide shaft parallel to the screw shaft is provided between the piston and the screw shaft, the guide shaft is inserted into the carriage, and the sliding nut moves on the screw shaft. 5. The apparatus according to claim 1, wherein the carriage is configured to be movable coaxially with the slide nut while sliding on the guide shaft. 6. Portable infusion device.   The portable drip apparatus according to any one of claims 1 to 5, wherein a speed control mechanism including an escape wheel, an ankle, and a balance is connected to the low-speed gear mechanism.

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