WO2015152296A1 - ピンチバルブおよびピンチバルブを備えた自動分析装置 - Google Patents
ピンチバルブおよびピンチバルブを備えた自動分析装置 Download PDFInfo
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- WO2015152296A1 WO2015152296A1 PCT/JP2015/060261 JP2015060261W WO2015152296A1 WO 2015152296 A1 WO2015152296 A1 WO 2015152296A1 JP 2015060261 W JP2015060261 W JP 2015060261W WO 2015152296 A1 WO2015152296 A1 WO 2015152296A1
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- Prior art keywords
- pinch
- tube
- pressing surface
- valve
- pinch tube
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
- F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
- F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
- F16K7/045—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by electric or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1095—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices for supplying the samples to flow-through analysers
- G01N35/1097—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices for supplying the samples to flow-through analysers characterised by the valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N2035/00346—Heating or cooling arrangements
- G01N2035/00356—Holding samples at elevated temperature (incubation)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/04—Details of the conveyor system
- G01N2035/0439—Rotary sample carriers, i.e. carousels
- G01N2035/0453—Multiple carousels working in parallel
Definitions
- the present invention relates to a pinch valve for sealing a flow path and an automatic analyzer provided with the pinch valve in the flow path.
- Patent Document 1 discloses an automatic analyzer for measuring a biological sample derived from blood, urine, or the like in the field of clinical laboratories, and includes a valve for controlling the measurement flow path to seal the flow path.
- An automatic analyzer that controls stopping and opening is described.
- a pinch valve exists as a main valve for controlling a flow path.
- the pinch valve closes the valve by operating the pinch rod with a coil and holding the pinch tube with the pinch rod and holding surface.
- This pinch valve may be used for, for example, a waste flow path switching unit that wastes a sample after completion of measurement because clogging of liquid and air containing particles does not occur when the flow path is switched.
- a pinch valve When a pinch valve is used to open and close the flow path of an automatic analyzer that needs to process multiple samples continuously, such as in a clinical laboratory, by repeatedly opening and closing the valve, the pinch rod of the pinch valve and If the surface around the pinch tube in contact with the holding surface exceeds the specified maintenance period, it may break due to fatigue cracks.
- the pinch tube is a regular replacement part, and the device for mounting the pinch valve requires regular maintenance. The user of the apparatus cannot perform analysis during execution of the regular maintenance, and there is a possibility that the inspection processing efficiency is lowered.
- the present invention is to prevent pinch tube fatigue and improve the maintainability of the apparatus.
- a holding part that holds a tube through which a fluid can pass, a pressing surface that is formed by a curved surface that contacts the pinch tube held by the holding part, and the pressing part sandwiching the pinch tube
- the shape of the portion that is provided facing the surface and is in contact with the pinch tube is formed with substantially the same shape and the same diameter as the pressing surface, and the width d of the shape of the contact portion is approximately the thickness of the pinch tube. It is characterized by comprising a pinch rod that is 1.5 times and a driving means for closing or opening the pinch tube by driving the pinch rod so that the distance between the holding surface and the pinch rod is variable. Yes.
- a pinch valve capable of reliably controlling the closing and opening of the flow path while reducing fatigue of the pinch tube and an automatic analyzer including the pinch valve are provided. be able to.
- the automatic analyzer will be described with reference to FIG.
- a sample container 102 for holding a sample is installed on a rack 101 of the analyzer 100, and a sample dispensing position near the sample dispensing nozzle 103 is provided by a rack transport line 117. To move.
- a plurality of reaction vessels 105 can be installed on the incubator disc 104, and a rotational movement for moving the reaction vessels 105 installed in the circumferential direction to predetermined positions is possible.
- the sample dispensing tip and reaction container transport mechanism 106 can move in three directions of the X axis, the Y axis, and the Z axis, and the sample dispensing tip and reaction container holding member 107, the reaction container stirring mechanism 108, and the sample dispensing chip.
- the range of the reaction container disposal hole 109, the sample dispensing tip mounting position 110, and a predetermined portion of the incubator disk 104 is moved to carry the sample dispensing tip and the reaction container.
- the sample dispensing tip and reaction vessel holding member 107 is provided with a plurality of unused reaction vessels and sample dispensing tips.
- the sample dispensing tip / reaction container transport mechanism 106 moves above the sample dispensing tip / reaction container holding member 107, descends, lifts after gripping an unused reaction container, and further moves to a predetermined position of the incubator disk 104. Move upward and move down to install the reaction vessel.
- sample dispensing tip and reaction vessel transport mechanism 106 moves above the sample dispensing tip and reaction vessel holding member 107, descends and holds an unused sample dispensing tip, and then moves up to sample sample. It moves above the tip placement position 110 and descends to install the sample dispensing tip.
- the sample dispensing nozzle 103 can be rotated and moved up and down, and after rotating and moving above the sample dispensing tip mounting position 110, the sample dispensing nozzle 103 is lowered and press-fitted into the tip of the sample dispensing nozzle 103. And put on.
- the sample dispensing nozzle 103 equipped with the sample dispensing tip moves upward above the sample container 102 placed on the transport rack 101 and then descends to suck a predetermined amount of the sample held in the sample container 102.
- the sample dispensing nozzle 103 that has sucked the sample moves upward above the incubator disk 104 and then descends to discharge the sample into an unused reaction vessel 105 held on the incubator disk 104.
- the sample dispensing nozzle 103 moves above the sample dispensing tip and the reaction container discarding hole 109 and discards the used sample dispensing tip from the disposal hole.
- a plurality of reagent containers 118 are installed on the reagent disk 111.
- a reagent disk cover 112 is provided above the reagent disk 111, and the inside of the reagent disk 111 is kept at a predetermined temperature.
- a reagent disk cover opening 113 is provided in a part of the reagent disk cover 112.
- the reagent dispensing nozzle 114 can be rotated and moved up and down. The reagent dispensing nozzle 114 descends after rotating above the opening 113 of the reagent disk cover 112 and immerses the tip of the reagent dispensing nozzle 114 in the reagent in a predetermined reagent container. Then, a predetermined amount of reagent is aspirated. Next, after the reagent dispensing nozzle 114 is raised, the reagent dispensing nozzle 114 rotates and moves above a predetermined position of the incubator disk 104 to discharge the reagent into the reaction vessel 105.
- the reaction container 105 from which the sample and the reagent have been discharged moves to a predetermined position by the rotation of the incubator disk 104, and is transported to the reaction container stirring mechanism 108 by the sample dispensing tip and the reaction container transport mechanism 106.
- the reaction vessel stirring mechanism 108 agitates and mixes the sample and the reagent in the reaction vessel by applying a rotational motion to the reaction vessel.
- the stirred reaction container is returned to a predetermined position of the incubator disk 104 by the sample dispensing tip and the reaction container transport mechanism 106.
- the reaction solution suction nozzle 115 can rotate and move up and down, dispenses the sample and the reagent, completes the stirring, moves to a position above the reaction vessel 105 where a predetermined reaction time has passed by the incubator disc 104, and descends. Then, the reaction solution in the reaction vessel 105 is sucked. The reaction liquid sucked by the reaction liquid suction nozzle 115 is analyzed by the detection unit 116.
- the reaction container 105 with the reaction solution sucked is moved to a predetermined position by the rotation of the incubator disk 104, and the sample dispensing chip and the reaction container discard hole 109 are moved from the incubator disk 105 by the sample dispensing chip and reaction container transport mechanism 106. Move upward and discard from the waste hole.
- FIG. 2 is a flow path configuration diagram of the detection unit 116 provided with the pinch valve of the present invention.
- Reaction liquid suction nozzle 201 for sucking or discharging liquid or air
- flow cell detector 202 for detecting an object to be measured
- syringe 203 for generating a pressure difference for sucking or discharging liquid or air
- liquid And a drain 204 for discharging air from the first flow path 206 connecting the nozzle and the inlet connection part 205 of the flow cell detector, and from the outlet connection part 207 of the flow cell detector to the branching part 209 via the first valve 208.
- the second flow path 210 communicating with the second flow path 210, then the third flow path 211 communicating with the syringe via the branch portion 209, and the fourth flow path communicating with the drain 204 from the branch portion 209 via the second valve 212. 213.
- FIG. 3 is a schematic diagram showing the structure of the pinch valve.
- the pinch valve 301 includes a pressing surface 302, a coil portion 303, a movable iron core 304 driven by the coil, a fixed iron core 305 that attracts the movable iron core, a pinch rod 306 that operates together with the aforementioned movable iron core, and a pinch tube 307. Consists of.
- the pinch valve moves the pinch rod toward the pinch tube by moving the movable iron core to the fixed iron core by the coil portion, and presses the upper surface 308 and the lower surface 309 of the pinch tube to be sealed with the pressing surface and the pinch rod, respectively. This closes the flow path in the pinch tube.
- FIG. 4 is an enlarged schematic view of the periphery of the pressing surfaces of the pinch valve 301, the pinch rod 306, and the pinch tube 307 when the valve is opened in the prior art.
- the upper surface 308 and the lower surface 309 of the pinch tube are divided into equal sections in the thickness direction and the length direction. Since the pinch tube is not deformed when the valve is opened, all the sections of the pinch tube have the same area.
- FIG. 5 is an enlarged schematic view of the vicinity of the holding surface of the pinch valve and the pinch tube when the valve is closed in the prior art.
- the pinch rod 306 When the valve is closed, the pinch rod 306 is raised so that the inner surface 501 of the upper surface 308 of the pinch tube and the inner surface 502 of the lower surface 309 are in contact with each other so as to close the flow channel in the pinch tube, and the flow channel is sealed. .
- the upper surface 501 and the lower surface 502 of the pinch tube have the largest amount of deformation at the portion where the pinch rod and the peripheral portion A of the pressing surface come into contact.
- the isosurface section of the upper surface of the pinch tube with which the peripheral edge portion A of the pressing surface 302 contacts is referred to as a maximum deformation location a.
- the deformation amount of the maximum deformation portion a of the pinch tube is determined by the following three factors.
- (1) Shape of holding surface and pinch rod (2) Influence of deformation at other locations (3) Pinch rod drive amount
- the shape of the hold surface and pinch rod and the pinch rod drive amount when the valve is closed are optimized.
- the above-mentioned problem is solved by reducing the amount of deformation at the maximum deformation location of the pinch tube when the valve is closed, and reducing the fatigue crack load on the pinch tube and extending the life.
- FIG. 6A and 6B are enlarged views of the periphery of the pinch valve when the valve is closed when the pressing surface has a curved contact surface that contacts the pinch tube.
- FIG. 6A shows a pinch in which a flat region 401 exists in the contact surface of the pressing surface that contacts the pinch tube, and the peripheral portion of the contact surface has an R chamfered shape (hereinafter, this shape is referred to as a square shape).
- R chamfered shape hereinafter, this shape is referred to as a square shape.
- FIG. 6B is a schematic diagram when the valve is closed with a pinch valve that is a pressing surface (hereinafter referred to as a curved surface shape) that is formed entirely as a curved surface without a flat region in the contact surface.
- the maximum deformation points b and c occur in a part of the pinch tube that contacts the peripheral edge of the contact surface of the pressing surface 302.
- the direction of the arrow indicates the deformation direction of the maximum deformation location
- the length indicates the deformation amount.
- the pinch tube since the pinch tube has a large friction coefficient, it is usually deformed according to the contact surface. Therefore, the deformation of the pinch tube becomes gentler in the curved shape than in the square shape.
- the pinch tube deformation maximum portion b in contact with the pressing surface is not only deformed according to the contact surface but also deformed to be pushed outward from the center with respect to the axial direction 601 of the pinch tube. Further added. Therefore, the deformation amount of the maximum deformation location c in FIG. 6A when the pressing surface is curved is reduced compared to the deformation amount of the maximum deformation location b in FIG. 6B when the pressing surface is square.
- FIG. 7 is a schematic diagram showing the relationship between the shape of the contact surface of the pressing surface 302 and the amount of deformation at the maximum deformation location. It is assumed that the tube thickness t and the pressing surface width d are constant. As R formed on the periphery of the holding surface is increased, the deformation of the maximum deformation portion of the pinch tube that occurs in contact with the periphery of the holding surface becomes gentle, and further, a flat that adds deformation that pushes the pinch tube in the axial direction. Therefore, the amount of deformation of the pinch tube surface can be reduced. In addition, when R becomes 1 / 3d or more, the deformation that pushes the pinch tube in the axial direction decreases, so the maximum deformation amount on the surface of the pinch tube decreases. Further, when R is 1 / 2d, the maximum deformation amount on the surface of the pinch tube is the smallest.
- FIG. 8A to 8C are views in which the width d of the pressing surface is changed in three ways to enlarge the periphery of the pressing surface of the pinch valve when the valve is closed. It is assumed that the width d increases from FIG. 8A to FIG. 8C.
- the pinch tube deformation portion e in contact with the center portion of the pressing surface is deformed so as to be pushed outward from the center portion with respect to the axial direction of the pinch tube as compared with the case of FIG. 8A and FIG. .
- the pinch tube deformation maximum point e in contact with the pressing curved surface is added to the pinch tube deformation maximum point e in contact with the pressing curved surface. Therefore, the amount of deformation on the pinch tube surface increases.
- FIG. 9 shows the relationship between the width d and the maximum deformation when the pressing surface 302 has a curved surface shape.
- the material of the pinch tube is general-purpose silicone rubber and has a hardness of about 50 to 70.
- the width d of the pressing surface When the width d of the pressing surface is small with respect to the thickness t of the pinch tube (in the case of FIG. 8A), the deformation of the pinch tube along the peripheral edge of the pressing surface becomes steep, so that the maximum deformation amount increases. .
- the width d of the pressing surface is larger than the thickness t of the pinch tube (in the case of FIG. 8C), not only the deformation following the curved contact surface but also the deformation pushed out toward the center portion in the axial direction 801. Since it is added, the maximum deformation becomes large.
- the pinch tube is deformed most gently with respect to the thickness t of each pinch tube, and other axial deformations are minimized, and the amount of deformation at the maximum deformation portion of the pinch tube is minimized. There is a width d.
- a curved surface shape R when a pinch tube made of a silicone rubber material having a tube thickness t of 0.5 to 1.5 mm was examined.
- a superelastic simulation using the finite element method was performed, and the deformation amount (strain amount) of the maximum deformation portion of the pinch tube was calculated.
- the amount of deformation of the maximum deformation part of the pinch tube can be reduced by about half to about half as compared with the case of using the pinch valve of the prior art, and the fatigue of the pinch tube Can be prevented.
- the inventor has a proportional relationship between the pinch tube thickness t and the width d ′ of the pressing surface that minimizes the maximum deformation with respect to the pinch tube (FIG. 10), and the diameter of the curved surface R It has been found that the deformation amount of the maximum deformation portion of the pinch tube can be reduced most when the thickness becomes about 1.5 times the pinch tube thickness t.
- FIG. 11A shows a pinch valve when the valve is closed when the holding surface 302 has a curved shape and the pinch rod 306 has a square shape
- FIG. 11B shows a valve when the holding surface 302 and the pinch rod 306 have the same curved shape. It is a pinch valve when closed.
- the amount of deformation of the upper and lower surfaces of the pinch tube becomes non-uniform between the holding surface and the pinch rod surface, and the upper surface 201 of the pinch tube is It expands and deforms to the holding surface side, and the deformation amount of the deformation portion f on the inner wall of the pinch tube increases.
- the deformation amount of the pinch tube deformation maximum point g is further added, the deformation amount of the pinch tube surface increases.
- the pinch valve is usually a structure that seals the flow path in the pinch tube by narrowing the distance between the pinch rod and the holding surface in a state where a fluid such as liquid or gas flows in the pinch tube. Therefore, in order to seal without leakage with the pinch valve, it is necessary to apply a sufficient sealing pressure to the inner surface of the pinch tube with respect to the internal pressure of the pinch tube.
- FIG. 12 is a schematic diagram showing a pinch tube state when the valve is closed when both the pressing surface 302 and the pinch rod 306 have the same curved surface shape.
- a surface pressure p is applied to the inner surface where the upper surface 501 and the lower surface 502 of the pinch tube contact.
- FIG. 13 is a graph showing the relationship between the pinch tube crushing amount h and the surface pressure p applied to the inner surface of the tube when the pinch valve having the shape of FIG. 12 is closed. In this graph, the thickness t of the pinch tube is constant.
- the surface pressure p increases.
- a crushing amount H1 when a pinch tube made of a silicone rubber material having a thickness t of 0.5 to 1.5 mm is used will be examined.
- the sealing pressure P1 at the time of closing the flow path required for the pinch valve is about 200 kPa
- the safety factor is 5
- the surface pressure p applied to the inner surface of the pinch tube at the time of valve closing needs to be about 1.0 MPa or more.
- the surface pressure p is about 1.0 MPa, and the flow path is sufficiently obtained. It was found that it can be sealed.
- the deformation amount strain amount
- the deformation amount can be reduced to about 0.16 times and about 1/10, and excessive force is concentrated, so that the pinch tube Can be prevented from becoming tired early.
- the product to which the pinch tube in the present invention is applied includes an automatic analyzer having a flow path mechanism including a flow cell type detector, and its detection principle and other device configurations may be different from those of the embodiments.
- a pinch valve provided in a flow path for feeding the sample to the electrode film may be used for an ion selective electrode that measures the ion concentration of Na, K, Cl in the sample.
- the pinch valve for closing and opening the flow path which lets gas pass may be sufficient.
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Abstract
Description
(1)押さえ面およびピンチロッドの形状
(2)他箇所変形による影響
(3)ピンチロッド駆動量
本発明では、押さえ面とピンチロッドの形状、および弁閉時のピンチロッド駆動量を最適化することで、弁閉時のピンチチューブの変形最大箇所における変形量を低減し、ピンチチューブへの疲労き裂負荷を減らして長寿命化することにより、上記課題を解決する。
101:ラック
102:サンプル容器
103:サンプル分注ノズル
104:インキュベータディスク
105:反応容器
106:サンプル分注チップおよび反応容器搬送機構
107:サンプル分注チップおよび反応容器保持部材
108:反応容器攪拌機構
109:サンプル分注チップおよび反応容器廃棄孔
110:サンプル分注チップ装着位置
111:試薬ディスク
112:試薬ディスクカバー
113:試薬ディスクカバー開口部
114:試薬分注ノズル
115:反応液吸引ノズル
116:検出ユニット
117:ラック搬送ライン
118:試薬容器
201:検出部
202:フローセル検出器
203:シリンジ
204:ドレイン
205:フローセル検出器入口接続部
206:第一流路
207:フローセル検出器出口接続部
208:第一弁
209:分岐部
210:第二流路
211:第三流路
212:第二弁
213:第四流路
301:ピンチバルブ
302:押さえ面
303:コイル
304:可動鉄心
305:固定鉄心
306:ピンチロッド
307:ピンチチューブ
308:ピンチチューブ上面
309:ピンチチューブ下面
401:平坦な領域
501:ピンチチューブ上面の内面
502:ピンチチューブ下面の内面
701:ピンチチューブ軸方向
Claims (11)
- 流体を通過させることが可能なチューブを保持する保持部と、
前記保持部にて保持されたピンチチューブと接触する面が曲面で形成された押さえ面と、
ピンチチューブをはさんで前記押さえ面と対向して設けられ、前記ピンチチューブと接触する部分の形状が前記押さえ面と略同一形状および略同一径で形成され、前記接触する部分の形状の幅dが当該ピンチチューブの厚みの略1.5倍であるピンチロッドと、
前記押さえ面と前記ピンチロッドとの間の距離を可変とするように駆動させることにより、前記ピンチチューブの閉鎖あるいは開放させる駆動手段と
を備えたことを特徴とするピンチバルブ。 - 請求項1記載のピンチバルブにおいて、
前記押さえ面および前記ピンチロッドが前記ピンチチューブと接触する面の曲率Rは、当該押さえ面および当該ピンチロッドが当該ピンチチューブと接触する面の幅dの略1/3以上であることを特徴とするピンチバルブ。 - 請求項2記載のピンチバルブにおいて、
前記ピンチチューブが、厚みt0.5~1.5mmのシリコーンゴム材質である場合、Rは略1.5であることを特徴とするピンチバルブ。 - 請求項1記載のピンチバルブにおいて、
当該ピンチバルブが閉鎖状態にある場合、
前記駆動手段は、面圧pがピンチチューブ内の内圧に対抗しうる封止圧力P1となる押しつぶし量H1となるよう、前記押さえ面と前記ピンチロッドの間の距離を制御することを特徴とするピンチバルブ。 - 請求項4記載のピンチバルブにおいて、
前記ピンチチューブが、厚みt0.5~1.5mmのシリコーンゴム材質である場合、押しつぶし量H1は略1.7~2.0mmであることを特徴とするピンチバルブ。 - 測定対象試料を分析する分析部と、
分析に使用する流体を通過させる流路と、
分析プロセスに応じて前記流路を開放および閉鎖するピンチチューブと、を備えた自動分析装置において、
前記ピンチバルブは、
前記ピンチチューブを保持する保持部と、
前記保持部にて保持されたピンチチューブと接触する面が曲面で形成された押さえ面と、
ピンチチューブをはさんで前記押さえ面と対向して設けられ、前記ピンチチューブと接触する部分の形状が前記押さえ面と略同一形状および略同一幅で形成され、前記接触する部分の形状の幅dが当該ピンチチューブの厚みの略1.5倍であるピンチロッドと、
前記押さえ面と前記ピンチロッドとの間の距離を可変とするように駆動させることにより、前記ピンチチューブの閉鎖あるいは開放させる駆動手段と
を備えたことを特徴とする自動分析装置。 - 請求項6記載の自動分析装置において、
前記分析部は生体由来試料中に含まれる測定対象成分を定量的または定性的に検出するフローセル検出部を有し、
前記ピンチバルブは、流体をフローセル検出部に連通させる流路上に設けられていることを特徴とする自動分析装置。 - 請求項6記載の自動分析装置において、
前記押さえ面および前記ピンチロッドが前記ピンチチューブと接触する面の曲率Rは、当該押さえ面および当該ピンチロッドが当該ピンチチューブと接触する面の幅dの略1/3以上であることを特徴とする自動分析装置。 - 請求項8記載の自動分析装置において、
前記ピンチチューブが、厚みt0.5~1.5mmのシリコーンゴム材質である場合、Rは略1.5であることを特徴とする自動分析装置。 - 請求項6記載の自動分析装置において、
当該ピンチバルブが閉鎖状態にある場合、
前記駆動手段は、面圧pがピンチチューブ内の内圧に対抗しうる封止圧力P1となる押しつぶし量H1となるよう、前記押さえ面と前記ピンチロッドの間の距離を制御することを特徴とする自動分析装置。 - 請求項11記載の自動分析装置において、
前記ピンチチューブが、厚みt0.5~1.5mmのシリコーンゴム材質である場合、押しつぶし量H1は略1.7mmであることを特徴とする自動分析装置。
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