CN112654379B - Occlusion detection device and clamping unit - Google Patents
Occlusion detection device and clamping unit Download PDFInfo
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- CN112654379B CN112654379B CN201980058388.1A CN201980058388A CN112654379B CN 112654379 B CN112654379 B CN 112654379B CN 201980058388 A CN201980058388 A CN 201980058388A CN 112654379 B CN112654379 B CN 112654379B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
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Abstract
Provided are a clamp unit and a closing detection device capable of suppressing the application of a load equal to or greater than a predetermined value to a load detection sensor that detects a load caused by a pressure from a pipe. The occlusion detection device 66 includes: a unit main body 61; a substrate 664 attached to the unit main body 61; a load detection sensor 665 disposed on the substrate 664 and detecting a load caused by a pressure from the pipe; a cover 62 for opening and closing the unit body 61; and a load absorbing unit 80, wherein when a load equal to or greater than a predetermined value is applied to the load detection sensor 665 in a state in which the unit main body 61 is closed by the cover 62 and the tube is disposed between the cover 62 and the load detection sensor 665, the load absorbing unit 80 absorbs the load applied to the substrate 664 via the load detection sensor 665.
Description
Technical Field
The present invention relates to an occlusion detection device and a clamping unit.
Background
Conventionally, a closing detection device including a unit main body, a cover for opening and closing the unit main body, and a load detection sensor for detecting a load caused by a pressure from a pipe has been known (for example, refer to patent document 1).
Prior art literature
Patent literature
Patent document 1 Japanese patent application laid-open No. 2014-83091
Disclosure of Invention
Problems to be solved by the invention
The load detection sensor is broken when a load of a predetermined or more is applied thereto. Therefore, it is desirable to suppress the load of a predetermined value or more from being applied to the load detection sensor.
The object of the present invention is to provide a closing detection device and a clamping unit capable of suppressing the application of a load equal to or greater than a predetermined value to a load detection sensor that detects a load caused by a pressure from a pipe.
Means for solving the problems
The present invention relates to an occlusion detection device including: a unit main body; a substrate mounted to the unit main body; a load detection sensor which is disposed on the substrate and detects a load caused by a pressure from the pipe; a cover part for opening and closing the unit main body; and a load absorbing unit that absorbs a load applied to the substrate via the load detection sensor when a load equal to or greater than a predetermined value is applied to the load detection sensor in a state in which the unit main body is closed by the cover unit and the pipe is disposed between the cover unit and the load detection sensor.
Further, it is preferable that the load absorbing portion has: a rod-shaped guide member that is disposed so as to penetrate the substrate in the thickness direction and supports the substrate so as to be movable in the thickness direction; and a biasing member that allows the substrate to move to a side that absorbs the load applied to the load detection sensor when a load equal to or greater than a predetermined value is applied to the load detection sensor, and that biases the substrate so that the load detection sensor is positioned at a detection position when a load lower than the predetermined value is applied to the load detection sensor.
Further, the biasing member is preferably constituted by 2 spring members, the guide member is provided with 2, the spring members and the guide member are arranged in 1 group, and the 2 groups of the spring members and the guide member are arranged at 2 positions of a portion of the substrate in a surface direction where the load detection sensor is arranged.
In addition, it is preferable that the load absorbing portion further has a connecting member connecting the 2 guide members.
The present invention also relates to a clamping unit including the occlusion detection device, wherein a tube is arranged between the unit body and the cover portion, thereby clamping the tube.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a closing detection device and a clamp unit capable of suppressing the application of a load equal to or greater than a predetermined value to a load detection sensor that detects a load caused by a pressure from a pipe.
Drawings
Fig. 1 is a diagram showing the overall configuration of a hemodialysis apparatus according to an embodiment of the present invention.
Fig. 2 is a front view showing the constitution of the holding unit.
Fig. 3 is a diagram showing an opened state of the clamp unit.
Fig. 4 is a perspective view showing a locked state of the clamp unit.
Fig. 5 is a perspective view of the clamping unit from the underside.
Fig. 6 is a cross-sectional view taken along line A-A in fig. 4.
Fig. 7 is a sectional view taken along line B-B in fig. 4.
Fig. 8 is a cross-sectional view showing the configuration of the load detection section.
Detailed Description
Hereinafter, a preferred embodiment of a hemodialysis apparatus including the clamping unit 60 of the present invention will be described with reference to the accompanying drawings. The hemodialysis apparatus of the present invention purifies blood of a patient suffering from renal insufficiency and/or a patient suffering from drug intoxication, removes excessive moisture in the blood, and supplements moisture (fluid replacement) to the blood as needed.
First, the overall configuration of the hemodialysis apparatus 1 of the present embodiment will be described with reference to fig. 1. The hemodialysis apparatus 1 as a dialysis apparatus includes a dialyzer 10 as a hemodialysis apparatus, a blood circuit 20, a dialysate circuit 30, a replenishment liquid line 38, and a console 100. The console 100 is provided with an operation panel 70, a clamp unit 60, a part of the blood circuit 20, a part of the dialysate circuit 30, a heater 40 as a temperature adjusting unit, a chemical liquid pump 231, a fluid replacement pump 39, and a control device 50.
The dialyzer 10 includes a container body 11 formed in a tubular shape and a dialysis membrane (not shown) housed in the container body 11, and the interior of the container body 11 is partitioned into a blood-side channel and a dialysate-side channel (both not shown) by the dialysis membrane. The container body 11 is formed with a blood inlet 111 and a blood outlet 112 that communicate with the blood-side channel, and a dialysate inlet 113 and a dialysate outlet 114 that communicate with the dialysate-side channel.
The blood circuit 20 includes an arterial line 21, a venous line 22, a drug line 23, and a relief line 24. The arterial line 21, the venous line 22, the drug line 23, and the overflow line 24 are each composed mainly of a flexible tube through which a liquid can flow.
In the present embodiment, the tubes constituting the arterial-side line 21, the venous-side line 22, the drug line 23, and the overflow line 24 are formed of flexible tubes such as polyvinyl chloride (PVC) and silicon (Si). As the tube, for example, a tube having an outer diameter of 5.5mm and an inner diameter of 3.3mm can be used. For example, a pipe having a hardness of about 50 to 85 (JIS K7215) can be used.
One end of the arterial line 21 is connected to an artery of a subject (dialysis patient), and the other end is connected to the blood inlet 111 of the dialyzer 10. The console 100 is disposed in the middle of the arterial line 21. The clamping unit 60 and the blood pump 212 are disposed at a portion of the console 100 through which the arterial line 21 passes. An arterial-side clamp portion (clamp portion) 65, a load detection portion 66, and an arterial-side bubble sensor (bubble detection portion) 67 are disposed at a portion of the clamp unit 60 through which the arterial-side line 21 passes. Details of the holding unit 60 will be described later.
The blood pump 212 is disposed downstream of the clamp unit 60 in the arterial line 21. The blood pump 212 uses a roller to nip the tube constituting the arterial line 21, and sends out the blood, the pre-flush liquid, and other liquid in the arterial line 21.
The venous-side line 22 has one end connected to the blood outlet 112 of the dialyzer 10 and the other end connected to a vein of a subject (dialysis patient). A venous side chamber 222 and a console 100 are disposed in the middle of the venous side line 22. In the console 100, the clamp unit 60 is disposed at a portion through which the vein side tube 22 passes. A vein side clamp portion 69 and a vein side bubble sensor 68 are disposed at a portion of the clamp unit 60 through which the vein side tube 22 passes. Details of the holding unit 60 will be described later.
The venous side chamber 222 is disposed in the venous side line 22 at a location between the dialyzer 10 and the console 100. Venous side lumen 222 retains a prescribed amount (e.g., 20 ml) of blood.
The medicine line 23 supplies a medicine necessary for hemodialysis to the arterial line 21. One end side (proximal end side) of the drug line 23 is connected to the drug solution pump 231 that delivers the drug, and the other end side (distal end side) is connected to a position between the blood pump 212 and the dialyzer 10 in the arterial line 21.
One end side (basal end side) of the overflow line 24 is connected to the venous side chamber 222. The overflow pipe 24 discharges the physiological saline, air, and the like flowing through the vein side pipe 22 in the priming step to the outside. An overflow clamp 241 is disposed in the overflow line 24. The overflow clamp 241 opens and closes the flow path of the overflow pipe 24.
Through the blood circuit 20 described above, blood taken out from an artery of a subject (dialysis patient) flows through the arterial-side line 21 by the blood pump 212 and is introduced into the blood-side flow path of the dialyzer 10. The blood introduced into the dialyzer 10 is purified by a dialysate flowing through a dialysate circuit 30 described later through a dialysis membrane. The blood purified in the dialyzer 10 flows through the venous-side line 22 and returns to the vein of the subject.
In the present embodiment, the dialysate circuit 30 is constituted by a dialysate circuit 30 of a so-called closed capacity control system. The dialysate circuit 30 includes a dialysate chamber 31, a dialysate supply line 32, a dialysate introduction line 33, a dialysate discharge line 34, a drain line 35, a bypass line 36, and a water removal/reverse filtration pump 37.
The dialysate chamber 31 includes a hard container 311 capable of containing a constant volume (e.g., 300ml to 500 ml) of dialysate, and a soft diaphragm (diahragm) 312 dividing the interior of the container 311. The inside of the dialysate chamber 31 is divided into a liquid-feeding storage portion 313 and a liquid-discharging storage portion 314 by a diaphragm 312.
The base end side of the dialysate supply line 32 is connected to a dialysate supply device (not shown), and the tip end side is connected to the dialysate chamber 31. The dialysate supply line 32 supplies dialysate to the liquid supply housing 313 of the dialysate chamber 31.
The dialysate introduction line 33 connects the dialysate chamber 31 to the dialysate introduction port 113 of the dialyzer 10, and introduces the dialysate stored in the liquid-feeding storage 313 of the dialysate chamber 31 into the dialysate-side flow path of the dialyzer 10.
The dialysate discharge line 34 connects the dialysate discharge port 114 of the dialyzer 10 to the dialysate chamber 31, and discharges the dialysate discharged from the dialyzer 10 to the drain housing portion 314 of the dialysate chamber 31.
The drain line 35 is connected to the dialysate chamber 31 at its base end side, and discharges the dialysate contained in the drain container 314.
The bypass line 36 connects the dialysate outlet line 34 with the drain line 35.
A water removal/reverse filtration pump 37 is disposed in the bypass line 36. The water removal/reverse filtration pump 37 is configured by a pump that can be driven so as to send the liquid in a direction (water removal direction) in which the dialysate in the bypass line 36 flows toward the drain line 35 and a direction (reverse filtration direction) in which the dialysate in the bypass line 36 flows toward the dialysate delivery line 34.
The heater 40 heats the dialysate flowing through the dialysate circuit 30 to a predetermined temperature.
The replenishment liquid line 38 is a line for directly supplying the dialysate to the blood circuit 20. As shown in fig. 1, the upstream side of the replenishment liquid line 38 is connected to a position between the dialysate chamber 31 and the dialysate introduction port 113 of the dialyzer 10 in the dialysate introduction line 33 of the dialysate circuit 30. The replenishment liquid pipe 38 is provided with a replenishment liquid holder 381. As shown by the solid line in fig. 1, when the downstream side of the replenishment liquid line 38 is connected to the arterial line 21 at a position between the blood pump 212 and the dialyzer 10, the pre-dilution type hemodialysis is performed. As shown by the broken line in fig. 1, when the downstream side of the replenishment liquid line 38 is connected to the venous side chamber 222 in the venous side line 22, the post-dilution type hemodialysis is performed.
The holding unit 60 is explained.
As shown in fig. 1, the clamping unit 60 is formed as a unit and is attached to the console 100. The holding unit 60 holds the tube constituting the arterial line 21 and the tube constituting the venous line 22 by holding them. The tube constituting the arterial-side line 21 is disposed vertically on one side in the width direction H of the holding unit 60, and the tube constituting the venous-side line 22 is disposed vertically on the other side in the width direction H.
As shown in fig. 2 to 5, the clamp unit 60 includes a unit main body 61, a cover 62 that opens and closes the unit main body 61, a hinge 63, an opening/closing lever 641, an opening/closing engagement portion 642, a base plate 664 (see fig. 5), and a load detection portion 66. The clamp unit 60 fixes the tube by disposing the tube between the unit main body 61 and the cover 62. The clamp unit 60 fixes the tube constituting the arterial line 21 and the tube constituting the venous line 22 by pressing the inner surface of the cover 62 against the inner surface side of the unit body 61 in a state where the tube constituting the arterial line 21 and the tube constituting the venous line 22 are disposed on the inner surface of the unit body 61.
The inner surface of the cap 62 constitutes a tube fixing portion for fixing the tube constituting the arterial side tube 21 and the tube constituting the venous side tube 22 with a constant force. As a material of at least a portion of the inner surface of the cover 62 that presses the tube, for example, a resin material, an ABS resin (acrylonitrile-butadiene-styrene copolymer), an ASA resin (butadiene substituted for the ABS resin, obtained by polymerizing an acrylic rubber), a synthetic resin such as polypropylene, or the like can be used. Thus, the inner surface of the cap 62 can fix the tube constituting the arterial side line 21 and the tube constituting the venous side line 22 with an appropriate holding force sufficient to hold the same without being excessively crushed.
As shown in fig. 2, the hinge 63 is disposed at the other end of the holding unit 60 in the width direction H during closing of the cover 62, and connects the cover 62 to the unit main body 61 so as to be rotatable.
The shutter lever 641 is provided at one end portion in the width direction H of the cover 62 when the cover 62 is closed. As shown in fig. 3, the opening/closing engagement portion 642 is provided at one end portion of the inner surface of the unit main body 61 in the width direction H so as to be engaged with the opening/closing lever 641 when the cover 62 is closed. The unit main body 61 and the cover 62 are opened and closed by operating the opening and closing lever 641.
As shown in fig. 3, a main body artery side tube arrangement portion 611 (tube arrangement portion) and a main body vein side tube arrangement portion 612 (tube arrangement portion) are formed on the inner surface of the unit main body 61. The main body side arterial side tube arrangement portion 611 and the main body side venous side tube arrangement portion 612 are arranged on the inner surface of the unit main body 61 so as to be separated from each other in the width direction H of the unit main body 61 and extend in a straight line. The main body side vein side tube arrangement portion 612 is arranged at a position closer to the hinge portion 63 side in the width direction H than the main body side artery side tube arrangement portion 611.
As shown in fig. 5, a substrate 664 is mounted on an outer surface 613 (see fig. 8) of the unit body 61. A force sensor 665 (load detection sensor) having a load detection unit 66 is attached (disposed) to a 1 st surface 664a (see fig. 8) of the substrate 664 on the unit main body 61 side (see fig. 8, described later).
As shown in fig. 3, a cover-side arterial-side tube arrangement portion 621 arranged so as to face the main-side arterial-side tube arrangement portion 611 when the cover 62 is closed, and a cover-side venous-side tube arrangement portion 622 arranged so as to face the main-side venous-side tube arrangement portion 612 are formed on the inner surface of the cover 62. The cover-side arterial-side tube arrangement portion 621 and the cover-side venous-side tube arrangement portion 622 are arranged on the inner surface of the cover 62 so as to be separated from each other in the width direction H of the cover 62, and extend linearly. The cover-side vein-side tube arrangement portion 622 is arranged at a position closer to the hinge portion 63 in the width direction H than the cover-side artery-side tube arrangement portion 621.
When the cap 62 is closed, a tube constituting the arterial line 21 is disposed between the main body arterial line disposition portion 611 and the cap arterial line disposition portion 621, and a tube constituting the venous line 22 is disposed between the main body venous line disposition portion 612 and the cap venous line disposition portion 622.
First, the configuration of the main body side artery side tube arrangement portion 611 and the cover side artery side tube arrangement portion 621 will be described.
As shown in fig. 3 and 6, when the cap 62 is closed, the arterial-side upstream tube pressing portion 601, the arterial-side clamping portion 65, the load detection portion 66, the arterial-side bubble sensor 67, and the arterial-side downstream tube pressing portion 602 are disposed along the main-body-side arterial-side tube arrangement portion 611 and the cap-side arterial-side tube arrangement portion 621. In the present embodiment, the arterial-side upstream tube pressing portion 601, the arterial-side clamp portion 65, the load detection portion 66, the arterial-side bubble sensor 67, and the arterial-side downstream tube pressing portion 602 are arranged in order from the upstream side toward the downstream side (from the lower side to the upper side in fig. 1 and 3) in the clamp unit 60.
As shown in fig. 3, the main body artery side tube arrangement part 611 is arranged on the inner surface of the unit main body 61. The main body-side arterial tube placement portion 611 includes, in order from the upstream side toward the downstream side (from the lower side to the upper side in fig. 3) of the liquid flowing through the tube constituting the arterial tube 21, a housing recess 601a of the arterial upstream tube pressing portion 601, an arterial movable clamping portion 651 of the arterial clamping portion 65, a load receiving portion 662 of the load detection portion 66, an arterial air bubble sensor receiving member 672 housing the ultrasonic oscillation portion 671 of the arterial air bubble sensor 67 therein, and a housing recess 602a of the arterial downstream tube pressing portion 602.
The cover-side arterial-side tube arrangement portion 621 is arranged on the inner surface of the cover 62, and is arranged so as to face the main body-side arterial-side tube arrangement portion 611 when the cover 62 is closed. The cap-side arterial tube placement unit 621 includes, in order from the upstream side toward the downstream side (from the lower side to the upper side in fig. 3) of the liquid flowing through the tube constituting the arterial tube 21, a pressing protrusion 601b of the arterial upstream tube pressing unit 601, an arterial clamp receiving unit 652 of the arterial clamp 65, a load pressing unit 663 of the load detection unit 66, an arterial bubble sensor pressing member 674 of the ultrasonic wave receiving unit 673 in which the arterial bubble sensor 67 is housed, and a pressing protrusion 602b of the arterial downstream tube pressing unit 602.
The pressing projection 601b of the arterial-side upstream tube pressing portion 601 is disposed so as to face the housing recess 601a disposed in the unit main body 61 when the cover 62 is closed, and presses the tube constituting the arterial-side tube 21 on the upstream side (lower side in fig. 3) of the liquid flowing through the arterial-side tube 21 in the clamp unit 60.
The artery side clamp receiving portion 652 is disposed so as to face the artery side movable clamp portion 651 disposed in the unit main body 61 when the cover 62 is closed. The arterial side clamp receiving portion 652 and the arterial side movable clamp portion 651 constitute an arterial side clamp portion 65, and hold the arterial side clamp portion by sandwiching a tube constituting the arterial side line 21.
As shown in fig. 3 and 6, the artery side clamp 65 includes an artery side movable clamp 651 disposed in the unit main body 61, a solenoid 653 disposed in the unit main body 61 and driving the artery side movable clamp 651, and an artery side clamp receiving portion 652 disposed in the cover 62. The artery-side clip receiving portion 652 is formed to protrude from the inner surface of the cover 62 and extend in the width direction H.
As shown in fig. 6, the artery side movable clamp 651 is formed in a trapezoidal shape having a tip formed in a planar shape extending in the width direction H and a narrow width on the tip side in a cross section cut in the direction in which the tube placement portion extends. An output shaft 653a of the solenoid 653 is connected to the rear end of the arterial side movable grip 651 so as to be movable forward and backward. The arterial side movable clamp 651 clamps a tube constituting the arterial side line 21 or opens and closes the arterial side line 21 by clamping a distal end of the arterial side movable clamp 651 and a distal end of the arterial side clamp receiving portion 652 by advancing and retreating an output shaft 653a of the solenoid 653.
The arterial side clamping portion 65 configured as described above clamps the tube constituting the arterial side line 21, which is disposed between the unit main body 61 and the cap 62, by the arterial side movable clamping portion 651 and the arterial side clamping receiving portion 652 during normal operation of the hemodialysis apparatus 1.
The arterial clamp portion 65 is opened and closed in a pre-flushing and blood returning step using physiological saline. The arterial side gripping portion 65 moves the arterial side movable gripping portion 651 forward and backward, or crushes or opens a tube constituting the arterial side line 21, and opens and closes the flow path of the arterial side line 21, thereby flowing and stopping the flow of the liquid flowing through the tube at a position upstream of the arterial side bubble sensor 67.
The load detection unit 66 detects a load caused by the pressure from the tube constituting the arterial line 21, and can output the load as a voltage value. That is, when the tube is closed, the pressure in the tube becomes positive or negative, the radial direction of the tube changes, and the load changes at the same time, and as a result, the change in the voltage value is detected. As shown in fig. 7, the load detection unit 66 includes a load pressing unit 663, a load receiving unit 662, a force sensor 665 disposed on a substrate 664, and a load absorbing unit 80. The load detection unit 66 constitutes an occlusion detection device.
As shown in fig. 3, 6 and 7, the load pressing portion 663 is disposed so as to face the load receiving portion 662 disposed in the unit main body 61 when the lid portion 62 is closed, and presses the tube constituting the arterial-side line 21. In order to obtain the same voltage value as the voltage value output from the load detection unit 66 when the pipe diameter is changed, the load pressing unit 663 may be configured to be height-adjustable or may be configured to be replaceable with a load pressing unit having a different height.
The load receiving portion 662 receives a load due to pressure from the tube constituting the arterial line 21 pressed by the load pressing portion 663 when the cover 62 is closed. The load receiving portion 662 transmits a load to the force sensor 665 disposed on the substrate 664. As shown in fig. 8, the load receiving portion 662 has a surface piece portion 662a, a pressing portion 662b, and a transmission shaft portion 662c. The surface piece 662a is disposed on the tube side, and abuts against the tube constituting the arterial-side line 21 when the cap 62 is closed. The pressing portion 662b and the transmission shaft portion 662c are disposed in the communication hole 615 of the unit main body 61. The communication hole 615 is formed to communicate the inner surface of the unit main body 61 with the outer surface 613. The surface piece portion 662a, the pressing portion 662b, and the transmission shaft portion 662c are arranged in this order from the inner surface side toward the outer surface 613 side of the unit body 61.
As shown in fig. 8, force sensor 665 is mounted (disposed) on 1 st surface 664a of substrate 664 formed on the unit main body 61 side. The substrate 664 is mounted to the outer surface 613 of the unit body 61. The substrate 664 is disposed so as to intersect with the direction in which the communication holes 615 extend to block the communication holes 615. The 1 st surface 664a of the substrate 664 on the unit main body 61 side is in contact with the outer surface 613 of the unit main body 61, and the 2 nd surface 664b on the opposite side to the 1 st surface 664a is pressed toward the unit main body 61 side by 2 spring members 82, 82 described later.
The force sensor 665 is disposed on the extension line of the communication hole 615 on the outer surface 613 side of the unit body 61. The load receiving portion 662 is disposed in the communication hole 615 as described above.
When the unit main body 61 is closed by the cover 62, the tube and the load receiving portion 662 constituting the arterial side line 21 are arranged in this order from the load pressing portion 663 side toward the force sensor 665 side between the load pressing portion 663 of the cover 62 and the force sensor 665.
The force sensor 665 configured as described above detects a load due to pressure from the pipe via the load receiving portion 662 by the load receiving portion 662 moving in the radial direction of the pipe due to pressure from the pipe acting on the load receiving portion 662. Thus, the force sensor 665 outputs the load due to the pressure from the tube constituting the arterial-side line 21 as a voltage.
As shown in fig. 8, the load absorbing portion 80 is disposed on the substrate 664. When a load equal to or greater than the allowable load (equal to or greater than a predetermined value) is applied to the force sensor 665 in a state where the unit main body 61 is closed by the cover 62 and the tube is disposed between the cover 62 and the force sensor 665, the load absorbing unit 80 absorbs the load applied to the substrate 664 via the force sensor 665. The load absorbing portion 80 has 2 guide marks 81, 81 (guide members), 2 spring members 82, 82 (urging members), and a connecting member 83 connecting the spring members 82, 82.
The guide marks 81 and the spring members 82 are configured such that the guide marks 81 and the spring members 82 are provided as a set, and in the present embodiment, 2 sets of guide marks 81 and spring members 82 are provided. The 2 sets of guide marks 81 and the spring members 82 are disposed at 2 portions of the portion sandwiching the disposition force sensor 665 in the surface direction of the substrate 664, separately.
The 2 guide marks 81, 81 are each formed in a cylindrical bar shape and extend in the thickness direction of the substrate 664. The guide mark 81 is disposed to penetrate the substrate 664 in the thickness direction, and movably supports the substrate 664 in the thickness direction. The 2 guide marks 81, 81 are arranged separately in the width direction H of the holding unit 60. The 2 guide marks 81, 81 are respectively inserted and fixed at one end side into a mounting hole 616 formed in an outer surface 613 of the unit body 61, and protrude from the outer surface 613 of the unit body 61 at the other end side. The 2 mounting holes 616 are formed to extend parallel to the communication holes 615, and are arranged in the width direction H of the holding unit 60 so as to sandwich the communication holes 615 in the surface direction of the substrate 664.
The connection member 83 is formed in a plate shape extending in the width direction H of the clamp unit 60. The connecting member 83 connects the other end side ends of the 2 guide marks 81, 81 to each other. Both ends of the connecting member 83 are fixed to the other end of the guide mark 81 by screws 811, respectively.
As shown in fig. 8, the 2 spring members 82, 82 are each formed in a coil shape externally attached to the guide mark 81. The spring member 82 is disposed so as to be extendable and retractable between the 2 nd surface 664b of the base plate 664 and the connecting member 83. The spring member 82 allows the substrate 664 to move to the side absorbing the load applied to the force sensor 665 when a load equal to or greater than the allowable load is applied to the force sensor 665, and forces the substrate 664 so that the force sensor 665 is positioned at the detection position when a load lower than the allowable load is applied to the force sensor 665.
Thus, when a load equal to or greater than the allowable load is applied to the force sensor 665, the movement of the substrate 664 to the side that absorbs the load applied to the force sensor 665 is allowed, and the application of a load equal to or greater than the allowable load (equal to or greater than a predetermined value) to the force sensor 665 can be suppressed. In the present embodiment, the spring constant of the spring member 82 is set to a value that does not contract when a load lower than the allowable load is applied to the force sensor 665, and contracts only when a load equal to or higher than the allowable load is applied to the force sensor 665.
In the load absorbing portion 80 configured as described above, when a load equal to or greater than the allowable load is applied to the force sensor 665 when the pipe is arranged between the unit main body 61 and the cover 62 in the case where the pipe is arranged in the sandwiching unit 60, the load in the thickness direction of the substrate 664 can be absorbed by the spring member 82. Therefore, the load greater than or equal to the allowable load (equal to or greater than the predetermined value) can be suppressed from being applied to the force sensor 665. Thus, breakage of the force sensor 665 can be prevented.
In addition, in the normal use state of the clamp unit 60, the load applied to the force sensor 665 is lower than the allowable load, and therefore the spring member 82 of the load absorbing portion 80 does not contract. That is, in a normal use state, the spring member 82 of the load absorbing portion 80 is not contracted but is held such that the force sensor 665 is located at the detection position, and therefore the force sensor 665 can normally detect a load caused by a pressure from the pipe. Thus, the load absorbing unit 80 does not affect the detection of the load by the force sensor 665 due to the pressure of the pipe in the normal use state.
Therefore, in a normal use state of the clamp unit 60, when the cap 62 is closed, the cap 62 presses the tube constituting the arterial-side line 21 against the force sensor 665, and the force sensor 665 detects a load due to the pressure from the tube and outputs the load as a voltage value. The detection value detected by the load detection unit 66 is sent to the control device 50, and it is determined whether or not the pipe is closed. Examples of the case of the tube occlusion include a case where the forceps is forgotten to be released after the connection of the blood circuit, a case where the needle tip is blocked by thrombus during blood return during treatment, a case where the needle tip is attached to the blood vessel wall during exsanguination/dialysis, and a case where the blood flow is insufficient due to a blood vessel state during exsanguination/dialysis/blood return.
As shown in fig. 3 and 6, the arterial air bubble sensor pressing member 674 is disposed so as to face the arterial air bubble sensor receiving member 672 disposed in the unit main body 61 at the time of closing the cap 62, and presses the tube constituting the arterial line 21. An ultrasonic wave receiving unit 673 is disposed inside the arterial air bubble sensor pressing member 674. An ultrasonic oscillation portion 671 is disposed inside the arterial air bubble sensor receiving member 672. The ultrasonic wave receiving unit 673 and the ultrasonic wave oscillating unit 671 constitute the arterial side bubble sensor 67. The arterial-side bubble sensor 67 is a sensor that detects the presence or absence of bubbles contained in the liquid flowing through the inside of the arterial-side line 21. The ultrasonic wave receiving unit 673 may be disposed inside the arterial air bubble sensor receiving member 672, and the ultrasonic wave oscillating unit 671 may be disposed inside the arterial air bubble sensor pressing member 674.
When the cap 62 is closed, the arterial air bubble sensor pressing member 674 (see fig. 3) presses the tube constituting the arterial line 21 against the arterial air bubble sensor receiving member 672 side. The ultrasonic wave receiving unit 673 irradiates the liquid flowing through the tube constituting the arterial-side line 21 with ultrasonic energy emitted from the ultrasonic oscillation unit 671, thereby detecting the difference in transmittance between the liquid and the air bubbles, and detecting the presence or absence of the air bubbles.
The pressing convex portion 602b of the arterial-side downstream tube pressing portion 602 is disposed so as to face the housing concave portion 602a disposed in the unit main body 61 when the lid portion 62 is closed, and presses the tube constituting the arterial-side tube 21 on the downstream side (upper side in fig. 3) of the liquid flowing through the arterial-side tube 21 in the clamp unit 60.
Next, the configuration of the main body side vein side tube arrangement portion 612 and the cover side vein side tube arrangement portion 622 provided at the time of closing the cover 62 will be described.
As shown in fig. 3, when the cover 62 is closed, the vein-side upstream tube pressing section 603, the vein-side bubble sensor 68, the vein-side clamp section 69, and the vein-side downstream tube pressing section 604 are arranged along the main body-side vein-side tube arrangement section 612 and the cover-side vein-side tube arrangement section 622. In the present embodiment, the vein-side upstream tube pressing section 603, the vein-side bubble sensor 68, the vein-side clamp section 69, and the vein-side downstream tube pressing section 604 are arranged in this order from the upstream side toward the downstream side (from the upper side to the lower side in fig. 1 and 3) in the clamp unit 60.
As shown in fig. 3, the main body vein side tube arrangement portion 612 is arranged on the inner surface of the unit main body 61. The main body-side vein-side tube arrangement unit 612 includes a housing recess 603a of the vein-side upstream tube pressing unit 603, a vein-side bubble sensor receiving member 682 in which an ultrasonic oscillation unit 681 of the vein-side bubble sensor 68 is housed, a vein-side movable clamp 691 of the vein-side clamp 69, and a housing recess 604a of the vein-side downstream tube pressing unit 604, which are arranged in this order from the upstream side toward the downstream side (from the upper side toward the lower side in fig. 3) of the fluid flowing through the tube constituting the vein-side tube 22.
The cap-side vein-side tube arrangement portion 622 is arranged on the inner surface of the cap 62 so as to face the main body-side vein-side tube arrangement portion 612 when the cap 62 is closed. The cap-side vein-side tube arrangement portion 622 includes, in order from the upstream side toward the downstream side (from the upper side toward the lower side in fig. 3) of the liquid flowing through the tube constituting the vein-side tube 22, a pressing protrusion 603b of the vein-side upstream tube pressing portion 603, a vein-side bubble sensor pressing member 684 of the ultrasonic wave receiving portion 683 in which the vein-side bubble sensor 68 is housed, a vein-side clamp receiving portion 692 of the vein-side clamp portion 69, and a pressing protrusion 604b of the vein-side downstream tube pressing portion 604.
The pressing convex portion 603b of the vein side upstream tube pressing portion 603 is disposed so as to face the housing concave portion 603a disposed in the unit main body 61 when the cover portion 62 is closed, and presses the tube constituting the vein side tube 22 on the upstream side (upper side in fig. 3) of the liquid flowing through the vein side tube 22 in the clamp unit 60.
The venous-side bubble sensor pressing member 684 is disposed so as to face the venous-side bubble sensor receiving member 682 disposed on the unit main body 61 at the time of closing the cover 62, and presses the tube constituting the venous-side tube 22. An ultrasonic wave receiving unit 683 is disposed inside the vein-side bubble sensor pressing member 684. An ultrasonic oscillating portion 681 is disposed inside the vein-side bubble sensor receiving member 682. The ultrasonic wave receiving unit 683 and the ultrasonic wave oscillating unit 681 constitute the vein-side bubble sensor 68. The vein-side bubble sensor 68 is a sensor that detects the presence or absence of bubbles contained in the liquid flowing through the inside of the vein-side tube 22. The ultrasonic wave receiving portion 683 may be disposed inside the vein-side bubble sensor receiving member 682, and the ultrasonic wave oscillating portion 681 may be disposed inside the vein-side bubble sensor receiving member 684.
When the cover 62 is closed, the vein-side bubble sensor pressing member 684 (see fig. 3) presses the tube constituting the vein-side tube 22 against the vein-side bubble sensor receiving member 682 side. The ultrasonic wave receiving unit 683 can detect the presence or absence of air bubbles by detecting the difference in transmittance between the liquid and the air bubbles by irradiating the liquid flowing through the tube constituting the vein-side tube 22 with ultrasonic wave emitted from the ultrasonic wave oscillating unit 681.
The vein side clamp receiving portion 692 is disposed so as to face the vein side movable clamp portion 691 disposed in the unit main body 61 when the cover portion 62 is closed. The vein side clamp receiving portion 692 and the vein side movable clamp portion 691 constitute the vein side clamp portion 69, and hold the tube constituting the vein side tube 22 with a clamp therebetween.
As shown in fig. 3 and 7, the vein side clamp portion 69 includes a vein side movable clamp portion 691 disposed on the unit main body 61, a solenoid 693 disposed on the unit main body 61 and driving the vein side movable clamp portion 691, and a vein side clamp receiving portion 692 disposed on the cover portion 62. The vein-side clip receiving portion 692 is formed so as to protrude from the inner surface of the cover portion 62 and extend in the width direction H.
The movable venous clamp 691 is formed in a trapezoidal shape having a planar distal end extending in the width direction H and a narrow distal end side in a cross section cut along the direction in which the tube arrangement portion extends. An output shaft 693a of the solenoid 693 is connected to a rear end of the vein side movable grip 691 in a retractable manner. The venous movable clamp 691 clamps a tube constituting the venous line 22 or opens and closes the venous line 22 by clamping a distal end of the venous movable clamp 691 and a distal end of the venous clamp receiving part 692 by advancing and retreating an output shaft 693a of the solenoid 693.
The venous side clamping portion 69 configured as described above clamps the tube constituting the venous side line 22, which is arranged between the unit main body 61 and the cover 62, by the venous side movable clamping portion 691 and the venous side clamping receiving portion 692 during normal operation of the hemodialysis apparatus 1.
In addition, the vein side clamp portion 69 is controlled based on the detection result of the air bubbles by the vein side air bubble sensor 68 or the artery side air bubble sensor 67. When bubbles are detected more than a predetermined amount by the vein-side bubble sensor 68 or the artery-side bubble sensor 67, the vein-side clamp portion 69 moves in and out the vein-side movable clamp portion 691 to collapse the tube constituting the vein-side tube 22 and closes the flow path of the vein-side tube 22, thereby stopping the liquid feeding of the liquid flowing through the tube at a position upstream of the vein-side bubble sensor 68.
The pressing protrusion 604b of the vein-side downstream tube pressing portion 604 is disposed so as to face the housing recess 604a disposed in the unit main body 61 when the cover 62 is closed, and presses the tube constituting the vein-side tube 22 on the downstream side (lower side in fig. 3) of the liquid flowing through the vein-side tube 22 in the clamp unit 60.
The clamping unit 60 configured as described above can reliably clamp the tube in the clamping unit 60 by simply closing the cover 62 in a state where the tube constituting the arterial-side line 21 and the tube constituting the venous-side line 22 are disposed in the unit main body 61.
The control device 50 is constituted by an information processing device (computer), and executes a control program to control the operation of the dialysis apparatus 1. The control device 50 controls the operation and the running of the hemodialysis apparatus 1 by executing control programs of various steps. Specifically, the control device 50 controls operations of various pumps, clamps, and the heater 40 and the like disposed in the blood circuit 20 and the dialysate circuit 30, and executes various processes (a priming process, a exsanguination process, a dialysis process, a fluid replacement process, a blood return process, and the like) performed by the hemodialysis apparatus 1.
According to the hemodialysis apparatus 1 of the present embodiment described above, the following effects are achieved.
(1) The load detection unit 66 includes: a unit main body 61; a substrate 664 mounted on the unit main body 61; a force sensor 665 disposed on the substrate 664 and detecting a load caused by a pressure from the pipe; a cover 62 for opening and closing the unit main body 61; and a load absorbing unit 80, wherein when a load equal to or greater than a predetermined value is applied to the force sensor 665 in a state in which the unit main body 61 is closed by the cover 62 and the tube is disposed between the cover 62 and the force sensor 665, the load absorbing unit 80 absorbs the load applied to the substrate 664 via the force sensor 665.
Therefore, when the tube is disposed between the unit main body 61 and the cover 62, it is possible to suppress the load equal to or greater than the allowable load from being applied to the force sensor 665. Therefore, when a load lower than the allowable load is applied to the substrate 664, the detection of the load of the force sensor 665 by the pressure from the pipe is not affected, and the application of a load equal to or higher than the allowable load to the force sensor 665 can be suppressed. This can suppress breakage of the force sensor 665.
(2) The load absorbing portion 80 has: a bar-shaped guide mark 81 that penetrates the substrate 664 in the thickness direction and supports the substrate 664 so that the substrate 664 can move in the thickness direction; and a spring member 82, wherein the spring member 82 allows the substrate 664 to move to a side absorbing the load applied to the force sensor 665 when a load of a predetermined value or more is applied to the force sensor 665, and wherein the spring member 82 biases the substrate 664 so that the force sensor 665 is positioned at the detection position when a load of a lower than a predetermined value is applied to the force sensor 665. Therefore, when a load equal to or greater than the allowable load is applied to the force sensor 665, the load in the thickness direction of the substrate 664 can be absorbed by the spring member 82 in a state where the substrate 664 is guided by the guide marks 81 so as to be movable in the thickness direction. This allows the load applied to the force sensor 665 to be absorbed by a simple structure.
(3) The 2 sets of spring members 82 and the guide marks 81 are arranged at 2 portions of the substrate 664 sandwiching the force sensors 665 in the surface direction. Accordingly, the load in the thickness direction of the substrate 664 can be absorbed by the 2 sets of spring members 82 and the guide marks 81 at the 2 positions sandwiching the force sensor 665. Thus, the load applied to the force sensor 665 can be stably absorbed.
(4) The load absorbing portion 80 further has a connecting member 83 connecting the 2 guide marks 81. This can maintain the parallel state of the 2 guide marks 81, and the substrate 644 guided by the 2 guide marks 81 can be smoothly moved in the thickness direction. This can stably absorb the load applied to the force sensor 665.
While preferred embodiments of the hemodialysis apparatus of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified as appropriate.
For example, in the above embodiment, the guide mark 81 (guide member) and the spring member 82 (urging member) are formed of 2 groups, but the present invention is not limited thereto, and may be formed of 1 group or 3 groups or more.
In the above embodiment, the 2 guide marks 81 are connected by the connecting member 83, but the connecting member 83 may not be provided.
In the above embodiment, the substrate 644 to which the force sensor 665 (load detection sensor) is attached is disposed on the outer surface of the unit main body 61, but the present invention is not limited thereto. For example, a recessed portion may be formed in the inner surface of the unit main body 61, and a substrate 644 to which a force sensor 665 (load detection sensor) is attached may be disposed in the recessed portion of the inner surface of the unit main body 61.
Description of the reference numerals
1. Hemodialysis device (dialysis device)
61. Unit body
62. Cover part
66. Load detection part (occlusion detection device)
80. Load absorbing part
81. Guide mark (guide component)
82. Spring component (force component)
83. Connecting component
664. Substrate board
665. Force sensor (load detection sensor)
Claims (5)
1. An occlusion detection device is provided with:
a unit main body;
a substrate mounted to the unit main body;
a load detection sensor which is disposed on the substrate and detects a load caused by a pressure from the pipe;
a cover part for opening and closing the unit main body; and
a load absorbing unit that absorbs a load applied to the substrate via the load detection sensor when a load equal to or greater than a predetermined value is applied to the load detection sensor in a state in which the unit main body is closed by the cover and the pipe is disposed between the cover and the load detection sensor,
the load absorbing portion has a biasing member that allows the substrate to move to a side that absorbs the load applied to the load detection sensor when a load of a predetermined value or more is applied to the load detection sensor, and biases the substrate so that the load detection sensor is positioned at a detection position when a load lower than the predetermined value is applied to the load detection sensor.
2. The occlusion detection device of claim 1, wherein,
the load absorbing portion has a bar-shaped guide member that penetrates the substrate in the thickness direction and supports the substrate so that the substrate can move in the thickness direction.
3. The occlusion detection device of claim 2, wherein,
the force application member is constituted by 2 spring members,
the guide members are provided with 2 guide members,
the spring members and the guide members are arranged in 1 group, and the spring members and the guide members in 2 groups are arranged at 2 positions of the portion where the load detection sensor is arranged in the surface direction of the substrate.
4. The occlusion detection device of claim 3, wherein,
the load absorbing portion further has a connecting member connecting the 2 guide members.
5. A clamping unit comprising the occlusion detection device according to any one of claims 1 to 4,
the tube is held by disposing the tube between the unit main body and the cover portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018197891A JP7176345B2 (en) | 2018-10-19 | 2018-10-19 | Obstruction detector and clamp unit |
| JP2018-197891 | 2018-10-19 | ||
| PCT/JP2019/040909 WO2020080468A1 (en) | 2018-10-19 | 2019-10-17 | Closure detection device and clamp unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112654379A CN112654379A (en) | 2021-04-13 |
| CN112654379B true CN112654379B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980058388.1A Active CN112654379B (en) | 2018-10-19 | 2019-10-17 | Occlusion detection device and clamping unit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7176345B2 (en) |
| CN (1) | CN112654379B (en) |
| WO (1) | WO2020080468A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101405587A (en) * | 2006-03-29 | 2009-04-08 | 株式会社Jms | Pressure detection apparatus |
| JP2013103102A (en) * | 2011-11-16 | 2013-05-30 | Top Corp | Pressure detection device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04346044A (en) * | 1991-05-23 | 1992-12-01 | Kanegafuchi Chem Ind Co Ltd | Pillow-type pressure sensor |
| EP1591767B1 (en) * | 2003-01-30 | 2011-03-23 | JMS Co., Ltd. | Pressure detector |
| US8495918B2 (en) * | 2010-10-20 | 2013-07-30 | Medtronic Minimed, Inc. | Sensor assembly and medical device incorporating same |
| JP5587958B2 (en) * | 2012-10-19 | 2014-09-10 | 日機装株式会社 | Ironing type pump |
| WO2017086456A1 (en) * | 2015-11-20 | 2017-05-26 | テルモ株式会社 | Medical pump and control method therefor |
| DE102017113398A1 (en) * | 2017-06-19 | 2018-06-21 | Fresenius Medical Care Deutschland Gmbh | Door of a medical sensor device, medical sensor device and medical treatment device |
-
2018
- 2018-10-19 JP JP2018197891A patent/JP7176345B2/en active Active
-
2019
- 2019-10-17 WO PCT/JP2019/040909 patent/WO2020080468A1/en active Application Filing
- 2019-10-17 CN CN201980058388.1A patent/CN112654379B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101405587A (en) * | 2006-03-29 | 2009-04-08 | 株式会社Jms | Pressure detection apparatus |
| JP2013103102A (en) * | 2011-11-16 | 2013-05-30 | Top Corp | Pressure detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020065558A (en) | 2020-04-30 |
| WO2020080468A1 (en) | 2020-04-23 |
| CN112654379A (en) | 2021-04-13 |
| JP7176345B2 (en) | 2022-11-22 |
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