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JP6888958B2 - Diaphragm and pressure detection chamber - Google Patents

Diaphragm and pressure detection chamber Download PDF

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JP6888958B2
JP6888958B2 JP2017003155A JP2017003155A JP6888958B2 JP 6888958 B2 JP6888958 B2 JP 6888958B2 JP 2017003155 A JP2017003155 A JP 2017003155A JP 2017003155 A JP2017003155 A JP 2017003155A JP 6888958 B2 JP6888958 B2 JP 6888958B2
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annular convex
blood
convex portion
diaphragm
chamber
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田中 明
明 田中
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TRUMO KABUSHIKI KAISHA
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Description

本発明は、血液循環回路内の圧力測定に使用するダイヤフラム及び圧力検出チャンバに関する。 The present invention relates to a diaphragm and a pressure detection chamber used for pressure measurement in a blood circulation circuit.

従来、体外循環装置(人工心肺装置等)の血液循環回路内の圧力測定には圧力検出チャンバが用いられている。圧力検出チャンバの従来例としては、中空状の容器と、容器内を血液循環回路内と連通する血液室と圧力センサと連通する空気室とに仕切るダイヤフラムとを備えた構成が知られている(例えば、下記特許文献1参照)。 Conventionally, a pressure detection chamber has been used for pressure measurement in a blood circulation circuit of an extracorporeal circulation device (artificial heart-lung machine or the like). As a conventional example of the pressure detection chamber, a configuration including a hollow container and a diaphragm that divides the inside of the container into a blood chamber communicating with the blood circulation circuit and an air chamber communicating with the pressure sensor is known ( For example, see Patent Document 1 below).

実開昭61−106253号公報Jikkai Sho 61-106253

血液循環回路内の圧力測定は安全性を高める上で重要であり、より正確に測定することが可能なデバイスが求められているが、従来のものは受圧時のダイヤフラムの動きがスムーズではなく、正確な圧力測定を行うことが難しかった。 Pressure measurement in the blood circulation circuit is important for improving safety, and a device that can measure more accurately is required, but the conventional one does not move the diaphragm smoothly at the time of receiving pressure, and the movement of the diaphragm is not smooth. It was difficult to make accurate pressure measurements.

本発明はこのような課題を考慮してなされたものであり、血液循環回路内の圧力をより正確に測定することが可能なデバイスを提供することを目的とする。 The present invention has been made in consideration of such a problem, and an object of the present invention is to provide a device capable of measuring the pressure in a blood circulation circuit more accurately.

上記の目的を達成するため、本発明は、血液循環回路内の圧力測定に使用する圧力検出チャンバ内に設けられ、前記圧力検出チャンバの内部を血液室と空気室とに仕切る隔膜を構成するダイヤフラムであって、中央膜部と、前記中央膜部を環状に囲むとともに軸に沿った断面形状が波形状の凹凸部と、前記ダイヤフラムの外周部を構成する周縁部と、を備え、前記凹凸部は、軸方向に凸状に設けられた環状凸部を複数有し、前記環状凸部の各々は、軸に沿った断面形状が湾曲形状を有するとともに、前記湾曲形状の曲率半径が0.8〜1.2mmであり、前記周縁部以外の部分の厚さが0.2〜0.4mmであり、ショアA硬度が35以下である、ことを特徴とする。 In order to achieve the above object, the present invention is provided in a pressure detection chamber used for pressure measurement in a blood circulation circuit, and a diaphragm constituting a diaphragm partitioning the inside of the pressure detection chamber into a blood chamber and an air chamber is provided. The concavo-convex portion is provided with a central membrane portion, a concavo-convex portion that surrounds the central membrane portion in an annular shape and has a wavy cross-sectional shape along an axis, and a peripheral edge portion that constitutes an outer peripheral portion of the diaphragm. Has a plurality of annular convex portions provided in a convex shape in the axial direction, and each of the annular convex portions has a curved cross-sectional shape along the axis, and the radius of curvature of the curved shape is 0.8. It is characterized in that it is ~ 1.2 mm, the thickness of the portion other than the peripheral portion is 0.2 to 0.4 mm, and the shore A hardness is 35 or less.

上記の構成を備えたダイヤフラムによれば、断面が波形状の凹凸部を構成する環状凸部の各々の曲率半径が0.8〜1.2mmであるため、受圧時に圧力の変化に応じて滑らかに変形しやすい。また、周縁部以外の部分の厚さが0.2〜0.4mmと薄いため圧力に応じて変形しやすい。さらに、ショアA硬度が35以下と軟らかいため圧力に応じて変形しやすい。従って、本発明のダイヤフラムによれば、受圧時のダイヤフラムの動きがスムーズになり、より正確な圧力測定を行うことが可能となる。 According to the diaphragm having the above configuration, since the radius of curvature of each of the annular convex portions forming the concave-convex portion having a wavy cross section is 0.8 to 1.2 mm, it is smooth according to the change in pressure when receiving pressure. Easy to transform into. Further, since the thickness of the portion other than the peripheral portion is as thin as 0.2 to 0.4 mm, it is easily deformed according to the pressure. Further, since the shore A hardness is as soft as 35 or less, it is easily deformed according to the pressure. Therefore, according to the diaphragm of the present invention, the movement of the diaphragm at the time of receiving pressure becomes smooth, and it becomes possible to perform more accurate pressure measurement.

前記凹凸部は、前記環状凸部として、前記血液室側に凸状に設けられた第1環状凸部及び第2環状凸部を有し、前記第1環状凸部は前記中央膜部を環状に囲み、前記第2環状凸部は前記第1環状凸部を環状に囲んでもよい。 The uneven portion has a first annular convex portion and a second annular convex portion provided convexly on the blood chamber side as the annular convex portion, and the first annular convex portion has the central membrane portion annular. The second annular convex portion may surround the first annular convex portion in an annular shape.

前記凹凸部は、前記環状凸部としてさらに、前記第1環状凸部と前記第2環状凸部との間に、前記空気室側に凸状に設けられた中間環状凸部を備えてもよい。 The uneven portion may further include an intermediate annular convex portion provided in a convex shape on the air chamber side between the first annular convex portion and the second annular convex portion as the annular convex portion. ..

この構成により、第1環状凸部と第2環状凸部との間に設けられた中間環状凸部も、受圧時に圧力の変化に応じて滑らかに変形しやすい。このため、受圧時のダイヤフラムの動きが一層スムーズになる。 With this configuration, the intermediate annular convex portion provided between the first annular convex portion and the second annular convex portion is also likely to be smoothly deformed in response to a change in pressure when receiving pressure. Therefore, the movement of the diaphragm at the time of receiving pressure becomes smoother.

また、本発明は、血液循環回路内の圧力測定に使用する圧力検出チャンバであって、中空状の検出容器と、前記検出容器の内部を血液室と空気室とに仕切る隔壁を構成するダイヤフラムと、を備え、前記ダイヤフラムは、中央膜部と、前記中央膜部を環状に囲むとともに軸に沿った断面形状が波形状の凹凸部と、前記ダイヤフラムの外周部を構成する周縁部と、を備え、前記凹凸部は、軸方向に凸状に設けられた環状凸部を複数有し、前記環状凸部の各々は、軸に沿った断面形状が湾曲形状を有するとともに、前記湾曲形状の曲率半径が0.8〜1.2mmであり、前記周縁部以外の部分の厚さが0.2〜0.4mmであり、ショアA硬度が35以下であることを特徴とする。 Further, the present invention is a pressure detection chamber used for pressure measurement in a blood circulation circuit, and includes a hollow detection container and a diaphragm constituting a partition partition for partitioning the inside of the detection container into a blood chamber and an air chamber. The diaphragm includes a central membrane portion, a concavo-convex portion having a wavy cross-sectional shape along an axis that surrounds the central membrane portion in an annular shape, and a peripheral edge portion that constitutes an outer peripheral portion of the diaphragm. The concave-convex portion has a plurality of annular convex portions provided in a convex shape in the axial direction, and each of the annular convex portions has a curved cross-sectional shape along the axis and the radius of curvature of the curved shape. Is 0.8 to 1.2 mm, the thickness of the portion other than the peripheral edge portion is 0.2 to 0.4 mm, and the shore A hardness is 35 or less.

上記圧力検出チャンバにおいて、前記凹凸部は、前記環状凸部として、前記血液室側に凸状に設けられた第1環状凸部及び第2環状凸部を有し、前記第1環状凸部は前記中央膜部を環状に囲み、前記第2環状凸部は前記第1環状凸部を環状に囲んでもよい。 In the pressure detection chamber, the uneven portion has a first annular convex portion and a second annular convex portion provided in a convex shape on the blood chamber side as the annular convex portion, and the first annular convex portion is The central membrane portion may be surrounded in an annular shape, and the second annular convex portion may surround the first annular convex portion in an annular shape.

上記圧力検出チャンバにおいて、前記凹凸部は、前記環状凸部としてさらに、前記第1環状凸部と前記第2環状凸部との間に、前記空気室側に凸状に設けられた中間環状凸部を備えてもよい。 In the pressure detection chamber, the concavo-convex portion is further provided as an annular convex portion between the first annular convex portion and the second annular convex portion in a convex shape on the air chamber side. A unit may be provided.

前記検出容器は、内部に前記血液室が形成された血液容器部と、内部に前記空気室が形成された空気容器部とを有し、前記血液容器部の前記空気容器部側の端部には外方に突出する第1フランジ部が設けられ、前記空気容器部の前記血液容器部側の端部には外方に突出する第2フランジ部が設けられ、前記ダイヤフラムの前記周縁部は、前記第1フランジ部と前記第2フランジ部との間に挟持され、前記第1フランジ部の外周部と前記第2フランジ部の外周部とは、射出成形された環状結合部材によって接合されていてもよい。 The detection container has a blood container portion having the blood chamber formed inside and an air container portion having the air chamber formed inside, and is provided at an end portion of the blood container portion on the air container portion side. Is provided with a first flange portion that protrudes outward, a second flange portion that protrudes outward is provided at the end portion of the air container portion on the blood container portion side, and the peripheral edge portion of the diaphragm is provided. It is sandwiched between the first flange portion and the second flange portion, and the outer peripheral portion of the first flange portion and the outer peripheral portion of the second flange portion are joined by an injection-molded annular coupling member. May be good.

この構成により、一定の圧力でダイヤフラムの周縁部を挟み込むことができるため、各フランジ部の外周部と環状結合部材との融着部が安定する。 With this configuration, the peripheral edge portion of the diaphragm can be sandwiched with a constant pressure, so that the fused portion between the outer peripheral portion of each flange portion and the annular coupling member is stable.

本発明のダイヤフラム及び圧力検出チャンバによれば、血液循環回路内の圧力をより正確に測定することが可能となる。 According to the diaphragm and the pressure detection chamber of the present invention, it is possible to measure the pressure in the blood circulation circuit more accurately.

体外循環装置の全体概略図である。It is an overall schematic view of an extracorporeal circulation device. 圧力検出チャンバの断面図である。It is sectional drawing of the pressure detection chamber. 血液容器部と空気容器部との結合構造の説明断面図である。It is explanatory sectional view of the connection structure of a blood container part and an air container part. ダイヤフラムの拡大断面図である。It is an enlarged sectional view of a diaphragm. 試験結果を示す図である。It is a figure which shows the test result.

以下、本発明に係るダイヤフラム及び圧力検出チャンバについて好適な実施形態を挙げ、添付の図面を参照しながら説明する。 Hereinafter, a diaphragm and a pressure detection chamber according to the present invention will be described with reference to suitable embodiments with reference to the accompanying drawings.

図1に示す体外循環装置10は、患者Pの血液の体外循環を行う装置である。体外循環装置10は、人工心肺装置として構成されており、患者Pの心臓に血液が循環しないため患者Pの体内でガス交換(血液への酸素付加及び/又は血液からの二酸化炭素の除去)ができない場合に、体外循環装置10により、血液の循環と、血液に対するガス交換を行うことができる。体外循環装置10は、患者Pの心臓に血液が循環し、患者Pの肺でガス交換を行うことができる場合に、血液の循環の補助を行うこともできる。 The extracorporeal circulation device 10 shown in FIG. 1 is a device that extracorporeally circulates the blood of patient P. The extracorporeal circulatory device 10 is configured as an artificial cardiopulmonary device, and since blood does not circulate in the heart of the patient P, gas exchange (addition of oxygen to the blood and / or removal of carbon dioxide from the blood) occurs in the body of the patient P. If this is not possible, the extracorporeal circulation device 10 can circulate blood and exchange gas for blood. The extracorporeal circulatory device 10 can also assist in blood circulation when blood circulates in the heart of patient P and gas exchange can be performed in the lungs of patient P.

図1に示すように、体外循環装置10は、患者Pの静脈(大静脈)から脱血して、血液中のガス交換を行って血液の酸素化を行った後、この血液を再び患者Pの動脈(大動脈)に戻す血液循環回路12を備える。血液循環回路12は、脱血チューブ14と、遠心ポンプ16(血液ポンプ)と、人工肺18と、送血チューブ20とを有する。 As shown in FIG. 1, the extracorporeal circulation device 10 removes blood from the vein (vaginal cava) of patient P, exchanges gas in the blood to oxygenate the blood, and then reconstitutes the blood with the patient P. It is provided with a blood circulation circuit 12 that returns to the arteries (aorta) of The blood circulation circuit 12 includes a blood removal tube 14, a centrifugal pump 16 (blood pump), an artificial lung 18, and a blood feeding tube 20.

脱血チューブ14は、静脈側カテーテル22(脱血側カテーテル)に接続される。静脈側カテーテル22は、患者Pの静脈(大腿静脈)に挿入される。遠心ポンプ16は、脱血チューブ14を介して静脈側カテーテル22に接続される。遠心ポンプ16は、脱血チューブ14を介して脱血した血液を人工肺18に送る。 The blood removal tube 14 is connected to the venous side catheter 22 (blood removal side catheter). The venous catheter 22 is inserted into the vein (femoral vein) of patient P. The centrifugal pump 16 is connected to the venous catheter 22 via the blood removal tube 14. The centrifugal pump 16 sends the bleeding blood to the artificial lung 18 via the bleeding tube 14.

遠心ポンプ16は、駆動モータ24によって回転駆動される。駆動モータ24は、制御装置26によって動作(回転速度)が制御される。なお、血液ポンプとしては、遠心式以外のポンプが用いられてもよい。 The centrifugal pump 16 is rotationally driven by the drive motor 24. The operation (rotational speed) of the drive motor 24 is controlled by the control device 26. As the blood pump, a pump other than the centrifugal type may be used.

人工肺18は、遠心ポンプ16と送血チューブ20との間に配置されており、脱血チューブ14を介して脱血された血液に対するガス交換動作(血液の酸素化)を行う。人工肺18としては、例えば、中空糸膜型人工肺が用いられる。 The artificial lung 18 is arranged between the centrifugal pump 16 and the blood feeding tube 20, and performs a gas exchange operation (oxygenization of blood) with respect to the blood bleeded through the blood removal tube 14. As the artificial lung 18, for example, a hollow fiber membrane type artificial lung is used.

送血チューブ20は、人工肺18によりガス交換がなされた血液を、動脈側カテーテル28(返血側カテーテル)を介して患者Pに戻す。動脈側カテーテル28は、患者Pの動脈(大腿動脈)に挿入される。 The blood feeding tube 20 returns the blood gas exchanged by the artificial lung 18 to the patient P via the arterial catheter 28 (return catheter). The arterial catheter 28 is inserted into the artery (femoral artery) of patient P.

血液循環回路12内を流れる血液の圧力に異常がないかどうかを検知するために、血液循環回路12には、本発明の実施形態に係る圧力検出チャンバ32が接続されている。図1に示す例では、送血チューブ20に圧力検出用分岐チューブ38が設けられており、当該圧力検出用分岐チューブ38に圧力検出チャンバ32が接続されている。圧力検出チャンバ32は、血液室34と空気室36とを有するダイヤフラム式の検出チャンバである。 In order to detect whether or not there is an abnormality in the pressure of blood flowing in the blood circulation circuit 12, the pressure detection chamber 32 according to the embodiment of the present invention is connected to the blood circulation circuit 12. In the example shown in FIG. 1, a pressure detection branch tube 38 is provided in the blood feeding tube 20, and a pressure detection chamber 32 is connected to the pressure detection branch tube 38. The pressure detection chamber 32 is a diaphragm type detection chamber having a blood chamber 34 and an air chamber 36.

圧力検出チャンバ32の血液室34は、圧力検出用分岐チューブ38を介して血液循環回路12と連通している。圧力検出チャンバ32には、連結チューブ40を介して圧力センサ42が接続されている。体外循環装置10は、圧力センサ42(例えば、アネロイド式圧力ゲージ等)により空気室36の圧力を検出することで、血液循環回路12内(図1に示す例では、送血チューブ20内)の圧力を測定することができる。 The blood chamber 34 of the pressure detection chamber 32 communicates with the blood circulation circuit 12 via the pressure detection branch tube 38. A pressure sensor 42 is connected to the pressure detection chamber 32 via a connecting tube 40. The extracorporeal circulation device 10 detects the pressure in the air chamber 36 by a pressure sensor 42 (for example, an aneroid type pressure gauge or the like), thereby causing the blood circulation circuit 12 (in the example shown in FIG. 1, the blood feeding tube 20). The pressure can be measured.

なお、圧力検出用分岐チューブ38は、血液循環回路12の他の部位、例えば、脱血チューブ14に設けられてもよい。圧力検出用分岐チューブ38は、遠心ポンプ16の上流側(脱血チューブ14)及び下流側(遠心ポンプ16と人工肺18との間)にそれぞれ設けられてもよい。圧力検出用分岐チューブ38は、人工肺18の上流側(遠心ポンプ16と人工肺18との間)及び下流側(送血チューブ20)にそれぞれ設けられてもよい。 The pressure detection branch tube 38 may be provided at another site of the blood circulation circuit 12, for example, the blood removal tube 14. The pressure detection branch tube 38 may be provided on the upstream side (blood removal tube 14) and the downstream side (between the centrifugal pump 16 and the artificial lung 18) of the centrifugal pump 16, respectively. The pressure detection branch tube 38 may be provided on the upstream side (between the centrifugal pump 16 and the artificial lung 18) and the downstream side (blood feeding tube 20) of the artificial lung 18, respectively.

図2に示すように、圧力検出チャンバ32は、中空状の検出容器44と、検出容器44の内部を血液室34と空気室36とに仕切る隔膜を構成するダイヤフラム46とを備える。 As shown in FIG. 2, the pressure detection chamber 32 includes a hollow detection container 44 and a diaphragm 46 that constitutes a diaphragm that divides the inside of the detection container 44 into a blood chamber 34 and an air chamber 36.

検出容器44は、内部に血液室34が形成された血液容器部48と、内部に空気室36が形成された空気容器部50とを有する。血液容器部48及び空気容器部50は、例えば、ポリカーボネート等の硬質樹脂により構成される。血液容器部48及び空気容器部50は、内部を観察できるように透明性を有する材料により構成されることが好ましい。 The detection container 44 has a blood container portion 48 having a blood chamber 34 formed inside, and an air container portion 50 having an air chamber 36 formed inside. The blood container portion 48 and the air container portion 50 are made of, for example, a hard resin such as polycarbonate. The blood container portion 48 and the air container portion 50 are preferably made of a transparent material so that the inside can be observed.

血液容器部48は、筒状(円筒状)の周壁部48aと、ダイヤフラム46と反対側で周壁部48aから連なる錐状の端壁部48bとを有する。血液容器部48には、回路接続用ポート56が設けられている。回路接続用ポート56は、血液室34に連通するとともに血液循環回路12(圧力検出用分岐チューブ38)に接続されるポートであり、検出容器44の中心軸a(以下、「軸a」という)に沿って、端壁部48bの頂部(中央部)に設けられている。なお、回路接続用ポート56は、血液容器部48の他の部位に設けられていてもよい。 The blood container portion 48 has a tubular (cylindrical) peripheral wall portion 48a and a cone-shaped end wall portion 48b connected to the peripheral wall portion 48a on the opposite side of the diaphragm 46. The blood container portion 48 is provided with a circuit connection port 56. The circuit connection port 56 is a port that communicates with the blood chamber 34 and is connected to the blood circulation circuit 12 (pressure detection branch tube 38), and is a central axis a (hereinafter, referred to as “axis a”) of the detection container 44. It is provided at the top (center portion) of the end wall portion 48b along the above. The circuit connection port 56 may be provided at another portion of the blood container portion 48.

空気容器部50は、筒状(円筒状)の周壁部50aと、ダイヤフラム46と反対側で周壁部50aから連なる錐状の端壁部50bとを有する。空気容器部50の端壁部50bには、圧力検出用ポート51が設けられている。圧力検出用ポート51は、端壁部50bからダイヤフラム46とは反対側に突出するとともに、連結チューブ40に接続されている。 The air container portion 50 has a tubular (cylindrical) peripheral wall portion 50a and a cone-shaped end wall portion 50b connected to the peripheral wall portion 50a on the opposite side of the diaphragm 46. A pressure detection port 51 is provided on the end wall portion 50b of the air container portion 50. The pressure detection port 51 projects from the end wall portion 50b to the side opposite to the diaphragm 46 and is connected to the connecting tube 40.

血液容器部48と空気容器部50とは、環状結合部材52により相互に結合されている。具体的に、血液容器部48の空気容器部50側の端部には外方に突出する円環状の第1フランジ部58が設けられている。空気容器部50の血液容器部48側の端部には外方に突出する円環状の第2フランジ部60が設けられている。 The blood container portion 48 and the air container portion 50 are connected to each other by the annular connecting member 52. Specifically, an annular first flange portion 58 projecting outward is provided at the end portion of the blood container portion 48 on the air container portion 50 side. An annular second flange portion 60 that projects outward is provided at the end portion of the air container portion 50 on the blood container portion 48 side.

図3に示すように、ダイヤフラム46の後述する周縁部68は、第1フランジ部58と第2フランジ部60との間に弾性圧縮状態で挟持されることで固定されている。第1フランジ部58の外周部58bと第2フランジ部60の外周部60bとは、射出成形された環状結合部材52によって接合されている。このような接合構造は、第1フランジ部58と第2フランジ部60との間に周縁部68を挟み込み、その状態で、第1フランジ部58の外周部58b及び第2フランジ部60の外周部60bに円周状に環状結合部材52を射出成形(インサート成形)することにより得られる。 As shown in FIG. 3, the peripheral edge portion 68 of the diaphragm 46, which will be described later, is fixed by being sandwiched between the first flange portion 58 and the second flange portion 60 in an elastically compressed state. The outer peripheral portion 58b of the first flange portion 58 and the outer peripheral portion 60b of the second flange portion 60 are joined by an injection-molded annular coupling member 52. In such a joining structure, the peripheral edge portion 68 is sandwiched between the first flange portion 58 and the second flange portion 60, and in that state, the outer peripheral portion 58b of the first flange portion 58 and the outer peripheral portion of the second flange portion 60 are formed. It is obtained by injection molding (insert molding) the annular coupling member 52 in a circumferential shape on 60b.

第1フランジ部58の、第2フランジ部60側の面には、周縁部68の軸方向一端が嵌合する第1嵌合凹部58cが設けられている。当該第1嵌合凹部58cは、軸aを中心に一周延在する環状に構成されている。第2フランジ部60の、第1フランジ部58側の面には、周縁部68の軸方向他端が嵌合する第2嵌合凹部60cが設けられている。当該第2嵌合凹部60cは、軸aを中心に一周延在する環状に構成されている。 A first fitting recess 58c into which one end of the peripheral edge portion 68 in the axial direction is fitted is provided on the surface of the first flange portion 58 on the side of the second flange portion 60. The first fitting recess 58c is formed in an annular shape extending around the axis a. The surface of the second flange portion 60 on the side of the first flange portion 58 is provided with a second fitting recess 60c into which the other end in the axial direction of the peripheral edge portion 68 is fitted. The second fitting recess 60c is formed in an annular shape extending around the axis a.

第1フランジ部58は、周壁部48aの開口側端部から径方向外方に突出した環状の基部58aと、当該基部58aから径方向外方に突出した環状の外周部58bとを有する。基部58aと外周部58bとの間には段差58dが形成されている。第2フランジ部60は、周壁部50aの開口側端部から径方向外方に突出した環状の基部60aと、当該基部60aから径方向外方に突出した環状の外周部60bとを有する。基部60aと外周部60bとの間には段差60dが形成されている。 The first flange portion 58 has an annular base portion 58a protruding radially outward from the opening side end of the peripheral wall portion 48a, and an annular outer peripheral portion 58b protruding radially outward from the base portion 58a. A step 58d is formed between the base portion 58a and the outer peripheral portion 58b. The second flange portion 60 has an annular base portion 60a protruding radially outward from the opening side end of the peripheral wall portion 50a, and an annular outer peripheral portion 60b protruding radially outward from the base portion 60a. A step 60d is formed between the base portion 60a and the outer peripheral portion 60b.

環状結合部材52は、外周構成部52aと、外周構成部52aの一端から径方向内方に向かって突出した第1環状突出部52bと、外周構成部52aの他端から径方向内方に向かって突出した第2環状突出部52cとを有し、コーナー部が直角に曲がった断面略U字状に構成されている。外周構成部52a、第1環状突出部52b及び第2環状突出部52cにより、第1フランジ部58の外周部58bと第2フランジ部60の外周部60bとを覆っている。 The annular coupling member 52 has an outer peripheral component 52a, a first annular projecting portion 52b protruding inward in the radial direction from one end of the outer peripheral component 52a, and a radial inward direction from the other end of the outer peripheral component 52a. It has a second annular protruding portion 52c that protrudes from the ground, and has a substantially U-shaped cross section in which the corner portion is bent at a right angle. The outer peripheral component 52a, the first annular protrusion 52b, and the second annular protrusion 52c cover the outer peripheral portion 58b of the first flange portion 58 and the outer peripheral portion 60b of the second flange portion 60.

図2において、ダイヤフラム46は、適度な弾力性を有するように構成された円形の膜状部材である。ダイヤフラム46は、血液室34側に突出した形状を有する。具体的に、ダイヤフラム46は、中央膜部62と、中央膜部62を囲む凹凸部63と、周縁部68とを有する。 In FIG. 2, the diaphragm 46 is a circular film-like member configured to have appropriate elasticity. The diaphragm 46 has a shape protruding toward the blood chamber 34. Specifically, the diaphragm 46 has a central film portion 62, an uneven portion 63 surrounding the central film portion 62, and a peripheral edge portion 68.

中央膜部62は、ダイヤフラム46の中央部を構成する部位であり、平坦な円形に構成されている。 The central film portion 62 is a portion constituting the central portion of the diaphragm 46, and is formed in a flat circular shape.

凹凸部63は、中央膜部62を環状に囲むとともに軸aに沿った断面形状が波形状を有する。ここで、「軸aに沿った断面形状」とは、軸aを含む平面における断面形状のことをいう。凹凸部63は、軸方向に凸状に設けられた環状凸部を複数有する。本実施形態では、凹凸部63は、複数の環状凸部として、第1環状凸部64(第1コンボリューション部)と、第2環状凸部66(第2コンボリューション部)とを有する。 The uneven portion 63 surrounds the central film portion 62 in an annular shape and has a wavy cross-sectional shape along the axis a. Here, the "cross-sectional shape along the axis a" means a cross-sectional shape in a plane including the axis a. The concave-convex portion 63 has a plurality of annular convex portions provided in a convex shape in the axial direction. In the present embodiment, the uneven portion 63 has a first annular convex portion 64 (first convolution portion) and a second annular convex portion 66 (second convolution portion) as a plurality of annular convex portions.

第1環状凸部64は、血液室34側に凸状に設けられ、中央膜部62を円環状に囲むとともに、軸aに沿った断面形状が湾曲形状を有する。本実施形態では、第1環状凸部64の湾曲形状は、血液室34側に膨出するように弧状に湾曲した形状である。図4において、第1環状凸部64の湾曲形状の曲率半径Raは、0.8〜1.2mmに設定されている。ここで、曲率半径Raは、第1環状凸部64の湾曲形状の内側(空気室36側)の面における曲率半径である。 The first annular convex portion 64 is provided in a convex shape on the blood chamber 34 side, surrounds the central membrane portion 62 in an annular shape, and has a curved cross-sectional shape along the axis a. In the present embodiment, the curved shape of the first annular convex portion 64 is a shape curved in an arc shape so as to bulge toward the blood chamber 34 side. In FIG. 4, the radius of curvature Ra of the curved shape of the first annular convex portion 64 is set to 0.8 to 1.2 mm. Here, the radius of curvature Ra is the radius of curvature on the inner surface (on the air chamber 36 side) of the curved shape of the first annular convex portion 64.

第1環状凸部64の湾曲形状(曲率半径Ra)は、単一の曲率半径を有してもよいし、0.8〜1.2mmの範囲内で複数の異なる曲率半径を有してもよい。第1環状凸部64の湾曲形状は、部分的に直線部を含んでいてもよい。例えば、第1環状凸部64の頂部が平坦であってもよい。 The curved shape (radius of curvature Ra) of the first annular convex portion 64 may have a single radius of curvature or may have a plurality of different radii of curvature within the range of 0.8 to 1.2 mm. Good. The curved shape of the first annular convex portion 64 may partially include a straight portion. For example, the top of the first annular convex portion 64 may be flat.

第2環状凸部66は、血液室34側に凸状に設けられ、第1環状凸部64を円環状に囲むとともに、軸aに沿った断面形状が湾曲形状を有する。本実施形態では、第2環状凸部66の湾曲形状は、血液室34側に膨出するように弧状に湾曲した形状である。第2環状凸部66の、軸aに沿った断面における曲率半径Rbは、0.8〜1.2mmに設定されている。ここで、曲率半径Rbは、第2環状凸部66の湾曲形状の内側(空気室36側)の面における曲率半径である。 The second annular convex portion 66 is provided in a convex shape on the blood chamber 34 side, surrounds the first annular convex portion 64 in an annular shape, and has a curved cross-sectional shape along the axis a. In the present embodiment, the curved shape of the second annular convex portion 66 is a shape curved in an arc shape so as to bulge toward the blood chamber 34 side. The radius of curvature Rb of the second annular convex portion 66 in the cross section along the axis a is set to 0.8 to 1.2 mm. Here, the radius of curvature Rb is the radius of curvature on the inner surface (on the air chamber 36 side) of the curved shape of the second annular convex portion 66.

第2環状凸部66の湾曲形状(曲率半径Rb)は、単一の曲率半径を有してもよいし、0.8〜1.2mmの範囲内で複数の異なる曲率半径を有してもよい。第2環状凸部66の湾曲形状は、部分的に直線部を含んでいてもよい。例えば、第2環状凸部66の頂部が平坦であってもよい。 The curved shape (radius of curvature Rb) of the second annular convex portion 66 may have a single radius of curvature or may have a plurality of different radii of curvature within the range of 0.8 to 1.2 mm. Good. The curved shape of the second annular convex portion 66 may partially include a straight portion. For example, the top of the second annular convex portion 66 may be flat.

本実施形態では、第2環状凸部66の中央膜部62からの突出高さH2は、第1環状凸部64の中央膜部62からの突出高さH1よりも高い。なお、第2環状凸部66の中央膜部62からの突出高さH2は、第1環状凸部64の中央膜部62からの突出高さH1と同じか、それより低くてもよい。 In the present embodiment, the protruding height H2 of the second annular convex portion 66 from the central film portion 62 is higher than the protruding height H1 of the first annular convex portion 64 from the central film portion 62. The protrusion height H2 of the second annular convex portion 66 from the central film portion 62 may be the same as or lower than the protrusion height H1 of the first annular convex portion 64 from the central film portion 62.

凹凸部63は、環状凸部としてさらに、第1環状凸部64と第2環状凸部66との間に設けられた中間環状凸部70を有する。中間環状凸部70は、第1環状凸部64を円環状に囲むとともに、軸aに沿った断面形状が湾曲形状を有する。本実施形態では、中間環状凸部70の湾曲形状は、空気室36側に膨出するように弧状に湾曲した形状である。中間環状凸部70の湾曲形状の曲率半径Rcは、0.8〜1.2mmに設定されている。ここで、曲率半径Rcは、中間環状凸部70の湾曲形状の内側(血液室34側)の面における曲率半径である。 The uneven portion 63 further has an intermediate annular convex portion 70 provided between the first annular convex portion 64 and the second annular convex portion 66 as the annular convex portion. The intermediate annular convex portion 70 surrounds the first annular convex portion 64 in an annular shape, and has a curved cross-sectional shape along the axis a. In the present embodiment, the curved shape of the intermediate annular convex portion 70 is a shape curved in an arc shape so as to bulge toward the air chamber 36 side. The radius of curvature Rc of the curved shape of the intermediate annular convex portion 70 is set to 0.8 to 1.2 mm. Here, the radius of curvature Rc is the radius of curvature on the inner surface (on the blood chamber 34 side) of the curved shape of the intermediate annular convex portion 70.

中間環状凸部70の湾曲形状(曲率半径Rc)は、単一の曲率半径を有してもよいし、0.8〜1.2mmの範囲内で複数の異なる曲率半径を有してもよい。中間環状凸部70の湾曲形状は、部分的に直線部を含んでいてもよい。例えば、中間環状凸部70の頂部が平坦であってもよい。 The curved shape (radius of curvature Rc) of the intermediate annular convex portion 70 may have a single radius of curvature or may have a plurality of different radii of curvature within the range of 0.8 to 1.2 mm. .. The curved shape of the intermediate annular convex portion 70 may partially include a straight portion. For example, the top of the intermediate annular convex portion 70 may be flat.

図4において、中間環状凸部70は、中央膜部62と略同じ軸方向位置に設けられている。なお、中間環状凸部70は、中央膜部62と異なる軸方向位置(中央膜部62よりも血液室34側又は中央膜部62よりも空気室36側)に設けられていてもよい。 In FIG. 4, the intermediate annular convex portion 70 is provided at substantially the same axial position as the central film portion 62. The intermediate annular convex portion 70 may be provided at an axial position different from that of the central membrane portion 62 (the blood chamber 34 side of the central membrane portion 62 or the air chamber 36 side of the central membrane portion 62).

ダイヤフラム46は、さらに、周縁部68の内側部から血液室34側に延出するとともに第2環状凸部66に連なる周壁部72を有する。周壁部72の外径は、血液室34側に向かってテーパ状に減少している。軸aに沿った断面において、周縁部68の内側部から連なる周壁部72の根元部72aは、径方向内方へと向かいつつ血液室34側へと湾曲した形状を有する。当該根元部72aの曲率半径Rdは、0.8〜1.2mmに設定されている。ここで、曲率半径Rdは、根元部72aの湾曲形状の内側(血液室34側)の面の曲率半径である。 The diaphragm 46 further has a peripheral wall portion 72 that extends from the inner portion of the peripheral edge portion 68 toward the blood chamber 34 and is connected to the second annular convex portion 66. The outer diameter of the peripheral wall portion 72 is tapered toward the blood chamber 34 side. In the cross section along the axis a, the root portion 72a of the peripheral wall portion 72 extending from the inner portion of the peripheral edge portion 68 has a shape curved toward the blood chamber 34 while moving inward in the radial direction. The radius of curvature Rd of the root portion 72a is set to 0.8 to 1.2 mm. Here, the radius of curvature Rd is the radius of curvature of the surface inside the curved shape of the root portion 72a (on the blood chamber 34 side).

ダイヤフラム46において、周縁部68以外の部分(周縁部68よりも内側の部分)(受圧時に弾性変形する部分)の厚さtは0.2〜0.4mmに設定されている。ダイヤフラム46の周縁部68以外の部分の厚さtは、上記範囲内で部分的に異なっていてもよい。 In the diaphragm 46, the thickness t of the portion other than the peripheral edge portion 68 (the portion inside the peripheral edge portion 68) (the portion elastically deformed when receiving pressure) is set to 0.2 to 0.4 mm. The thickness t of the portion of the diaphragm 46 other than the peripheral edge portion 68 may be partially different within the above range.

ダイヤフラム46は、その全体に亘って、ショアA硬度が35以下である。なお、ダイヤフラム46は、周縁部68以外の部分のショアA硬度が35以下であればよい。ダイヤフラム46のショアA硬度は、上記範囲内で部分的に異なっていてもよい。 The diaphragm 46 has a shore A hardness of 35 or less throughout. The diaphragm 46 may have a shore A hardness of 35 or less at a portion other than the peripheral portion 68. The shore A hardness of the diaphragm 46 may be partially different within the above range.

ダイヤフラム46の構成材料としては、例えば、シリコーンゴム、フッ素ゴム、エチレンプロピレン系ゴム、又はポリウレタン等が挙げられる。 Examples of the constituent material of the diaphragm 46 include silicone rubber, fluororubber, ethylene propylene rubber, polyurethane and the like.

体外循環装置10(図1)の動作時(血液循環回路12内を血液が流通する際)、ダイヤフラム46は、血液の圧力によって空気室36側に変形する。その分だけ、空気室36の容積が減少して空気圧が上昇し平衡状態となる。従って、そのときの空気圧を圧力センサ42(図1)で検出することにより、血液循環回路12内の圧力を測定することができる。 During the operation of the extracorporeal circulation device 10 (FIG. 1) (when blood flows through the blood circulation circuit 12), the diaphragm 46 is deformed toward the air chamber 36 by the pressure of the blood. By that amount, the volume of the air chamber 36 decreases, the air pressure rises, and an equilibrium state is reached. Therefore, the pressure in the blood circulation circuit 12 can be measured by detecting the air pressure at that time with the pressure sensor 42 (FIG. 1).

この場合、本実施形態に係るダイヤフラム46及び圧力検出チャンバ32は、以下の効果を奏する。 In this case, the diaphragm 46 and the pressure detection chamber 32 according to the present embodiment have the following effects.

第1環状凸部64及び第2環状凸部66の各々の湾曲形状の曲率半径Ra、Rbが0.8〜1.2mmであるため、受圧時に圧力の変化に応じて滑らかに変形しやすい。また、周縁部68以外の部分の厚さが0.2〜0.4mmと薄いため圧力に応じて変形しやすい。さらに、ショアA硬度が35以下と軟らかいため圧力に応じて変形しやすい。従って、本発明のダイヤフラム46及びこれを備えた圧力検出チャンバ32によれば、受圧時のダイヤフラム46の動きがスムーズになり、より正確な圧力測定を行うことが可能となる。 Since the radius of curvature Ra and Rb of each of the curved shapes of the first annular convex portion 64 and the second annular convex portion 66 are 0.8 to 1.2 mm, they are easily deformed smoothly according to the change in pressure when receiving pressure. Further, since the thickness of the portion other than the peripheral portion 68 is as thin as 0.2 to 0.4 mm, it is easily deformed according to the pressure. Further, since the shore A hardness is as soft as 35 or less, it is easily deformed according to the pressure. Therefore, according to the diaphragm 46 of the present invention and the pressure detection chamber 32 provided with the diaphragm 46, the movement of the diaphragm 46 at the time of receiving pressure becomes smooth, and more accurate pressure measurement becomes possible.

第1環状凸部64と第2環状凸部66との間には湾曲形状を有する中間環状凸部70が設けられており、当該中間環状凸部70の湾曲形状の曲率半径Rcは、0.8〜1.2mmである。この構成により、第1環状凸部64と第2環状凸部66との間に設けられた中間環状凸部70も、受圧時に圧力の変化に応じて滑らかに変形しやすい。このため、受圧時のダイヤフラム46の動きが一層スムーズになる。 An intermediate annular convex portion 70 having a curved shape is provided between the first annular convex portion 64 and the second annular convex portion 66, and the radius of curvature Rc of the curved shape of the intermediate annular convex portion 70 is 0. It is 8 to 1.2 mm. With this configuration, the intermediate annular convex portion 70 provided between the first annular convex portion 64 and the second annular convex portion 66 is also likely to be smoothly deformed in response to a change in pressure when receiving pressure. Therefore, the movement of the diaphragm 46 at the time of receiving pressure becomes smoother.

図3に示したように、血液容器部48の空気容器部50側の端部には外方に突出する第1フランジ部58が設けられ、空気容器部50の血液容器部48側の端部には外方に突出する第2フランジ部60が設けられ、ダイヤフラム46の周縁部68は、第1フランジ部58と第2フランジ部60との間に挟持されている。そして、第1フランジ部58の外周部58bと第2フランジ部60の外周部60bとは、射出成形された環状結合部材52によって接合されている。この構成により、一定の圧力でダイヤフラム46の周縁部68を挟み込むことができるため、各フランジ部58、60の外周部58b、60bと環状結合部材52との融着部が安定する。 As shown in FIG. 3, a first flange portion 58 projecting outward is provided at the end portion of the blood container portion 48 on the air container portion 50 side, and the end portion of the air container portion 50 on the blood container portion 48 side. Is provided with a second flange portion 60 projecting outward, and a peripheral edge portion 68 of the diaphragm 46 is sandwiched between the first flange portion 58 and the second flange portion 60. The outer peripheral portion 58b of the first flange portion 58 and the outer peripheral portion 60b of the second flange portion 60 are joined by an injection-molded annular coupling member 52. With this configuration, the peripheral edge portion 68 of the diaphragm 46 can be sandwiched with a constant pressure, so that the fused portion between the outer peripheral portions 58b and 60b of the flange portions 58 and 60 and the annular coupling member 52 is stable.

本発明の効果を確認するため、本発明の実施例及び比較例について、圧力応答性確認試験を行った。なお、圧力応答性とは、血液容器部(血液室内)の圧力がどれだけ空気容器部(空気室内)に伝わっているかの度合いを示す。 In order to confirm the effect of the present invention, a pressure responsiveness confirmation test was conducted on Examples and Comparative Examples of the present invention. The pressure responsiveness indicates how much pressure in the blood container portion (blood chamber) is transmitted to the air container portion (air chamber).

図5及び表1は試験結果を示している。図5及び表1に示すように、本試験では、実施例1〜4(本発明)及び比較例1〜5について誤差圧を測定した。なお、表1中の実施例4並びに比較例4及び5については、図5ではグラフ表示を省略している。本試験では、流体として水を満たし、回路側圧力を50〜500mmHgまで変化させて、各圧力について誤差圧を測定した。ここで、誤差圧は、回路側圧力(血液循環回路に直接設置した圧力センサにより検出した圧力)から検出側圧力(空気容器部に接続した圧力センサにより検出した圧力)を引いた値であり、誤差圧が小さいほど、圧力の検出精度が高いといえる。 FIG. 5 and Table 1 show the test results. As shown in FIG. 5 and Table 1, in this test, the error pressure was measured for Examples 1 to 4 (the present invention) and Comparative Examples 1 to 5. In addition, about Example 4 and Comparative Examples 4 and 5 in Table 1, the graph display is omitted in FIG. In this test, water was filled as a fluid, the circuit side pressure was changed from 50 to 500 mmHg, and the error pressure was measured for each pressure. Here, the error pressure is a value obtained by subtracting the detection side pressure (pressure detected by the pressure sensor connected to the air container portion) from the circuit side pressure (pressure detected by the pressure sensor directly installed in the blood circulation circuit). It can be said that the smaller the error pressure, the higher the pressure detection accuracy.

Figure 0006888958
Figure 0006888958

表1において、「Rどり」の項目は、第1環状凸部及び第2環状凸部が湾曲形状(曲率半径1.0mm)を有する場合に「あり」と表記し、湾曲形状を有しない場合(各環状凸部が台形状の場合)に「なし」と表記した。 In Table 1, the item of "R-dori" is described as "yes" when the first annular convex portion and the second annular convex portion have a curved shape (curvature radius 1.0 mm), and when the first annular convex portion does not have a curved shape. (When each annular convex part is trapezoidal) is described as "None".

本試験では、回路側圧力が高いほど、誤差圧が大きくなる傾向が見られた。そこで、目標圧(回路側圧力の設定値)500mmHgにおける誤差圧が4mmHg以下の場合に、「圧力応答性がよい」と評価した。表1においては、目標圧500mmHgにおける誤差圧が4mmHgを基準値とし、当該基準値以下のものを「OK」(圧力応答性がよい)と表記し、基準値を超えるものを「NG」(圧力応答性が悪い)と表記した。 In this test, the higher the circuit side pressure, the larger the error pressure tended to be. Therefore, when the error pressure at the target pressure (set value of the circuit side pressure) of 500 mmHg is 4 mmHg or less, it is evaluated as "good pressure response". In Table 1, an error pressure of 4 mmHg at a target pressure of 500 mmHg is set as a reference value, those below the reference value are described as "OK" (good pressure responsiveness), and those exceeding the reference value are "NG" (pressure). Poor responsiveness).

表1より、比較例1〜5ではいずれも圧力応答性が悪いという結果が得られた。これに対し、実施例1〜4(本発明)ではいずれも圧力応答性がよいという結果が得られた。 From Table 1, it was obtained that the pressure responsiveness was poor in all of Comparative Examples 1 to 5. On the other hand, in Examples 1 to 4 (the present invention), the results that the pressure responsiveness was good were obtained.

本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々の改変が可能である。 The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

10…体外循環装置 12…血液循環回路
32…圧力検出チャンバ 34…血液室
36…空気室 44…検出容器
46…ダイヤフラム 48…血液容器部
62…中央膜部 64…第1環状凸部
66…第2環状凸部 68…周縁部
70…中間環状凸部
10 ... Extracorporeal circulation device 12 ... Blood circulation circuit 32 ... Pressure detection chamber 34 ... Blood chamber 36 ... Air chamber 44 ... Detection container 46 ... Diaphragm 48 ... Blood container part 62 ... Central membrane part 64 ... First annular convex part 66 ... First annular convex part 66 ... 2 annular convex portion 68 ... peripheral portion 70 ... intermediate annular convex portion

Claims (7)

血液循環回路内の圧力測定に使用する圧力検出チャンバ内に設けられ、前記圧力検出チャンバの内部を血液室と空気室とに仕切る隔膜を構成するダイヤフラムであって、
中央膜部と、
前記中央膜部を環状に囲むとともに軸に沿った断面形状が波形状の凹凸部と、
前記ダイヤフラムの外周部を構成する周縁部と、を備え、
前記凹凸部は、前記ダイヤフラムに血圧が作用していない自然状態で前記血液室側に向かって凸状に設けられた環状凸部を複数有し、
前記凹凸部は、前記環状凸部として、前記血液室側に凸状に設けられた第1環状凸部及び第2環状凸部を有し、前記第1環状凸部は前記中央膜部を環状に囲み、前記第2環状凸部は前記自然状態で前記第1環状凸部を環状に囲み
前記環状凸部の各々は、軸に沿った断面形状が湾曲形状を有するとともに、前記湾曲形状の曲率半径が0.8〜1.2mmであり、
前記周縁部以外の部分の厚さが0.2〜0.4mmであり、
ショアA硬度が35以下である、
ことを特徴とするダイヤフラム。
A diaphragm provided in a pressure detection chamber used for pressure measurement in a blood circulation circuit and forming a diaphragm that divides the inside of the pressure detection chamber into a blood chamber and an air chamber.
Central membrane and
An uneven portion that surrounds the central membrane portion in an annular shape and has a wavy cross-sectional shape along the axis.
A peripheral portion constituting the outer peripheral portion of the diaphragm is provided.
The uneven portion has a plurality of annular convex portions provided in a convex shape toward the blood chamber side in a natural state in which blood pressure does not act on the diaphragm.
The uneven portion has a first annular convex portion and a second annular convex portion provided convexly on the blood chamber side as the annular convex portion, and the first annular convex portion has the central membrane portion annular. The second annular convex portion surrounds the first annular convex portion in a ring shape in the natural state .
Each of the annular convex portions has a curved cross-sectional shape along the axis, and the radius of curvature of the curved shape is 0.8 to 1.2 mm.
The thickness of the portion other than the peripheral portion is 0.2 to 0.4 mm, and the thickness is 0.2 to 0.4 mm.
Shore A hardness is 35 or less,
A diaphragm characterized by that.
請求項1記載のダイヤフラムにおいて、
前記凹凸部が有する前記環状凸部は、前記第1環状凸部及び前記第2環状凸部の2つのみである、
ことを特徴とするダイヤフラム。
In the diaphragm according to claim 1.
The concave-convex portion has only two annular convex portions, the first annular convex portion and the second annular convex portion.
A diaphragm characterized by that.
請求項2記載のダイヤフラムにおいて、
前記凹凸部は、前記環状凸部としてさらに、前記第1環状凸部と前記第2環状凸部との間に、前記空気室側に凸状に設けられた中間環状凸部を備える、
ことを特徴とするダイヤフラム。
In the diaphragm according to claim 2.
The uneven portion further includes, as the annular convex portion, an intermediate annular convex portion provided in a convex shape on the air chamber side between the first annular convex portion and the second annular convex portion.
A diaphragm characterized by that.
血液循環回路内の圧力測定に使用する圧力検出チャンバであって、
中空状の検出容器と、
前記検出容器の内部を血液室と空気室とに仕切る隔壁を構成するダイヤフラムと、を備え、
前記ダイヤフラムは、
中央膜部と、
前記中央膜部を環状に囲むとともに軸に沿った断面形状が波形状の凹凸部と、
前記ダイヤフラムの外周部を構成する周縁部と、を備え、
前記凹凸部は、前記ダイヤフラムに血圧が作用していない自然状態で前記血液室側に向かって凸状に設けられた環状凸部を複数有し、
前記凹凸部は、前記環状凸部として、前記血液室側に凸状に設けられた第1環状凸部及び第2環状凸部を有し、前記第1環状凸部は前記中央膜部を環状に囲み、前記第2環状凸部は前記自然状態で前記第1環状凸部を環状に囲み
前記環状凸部の各々は、軸に沿った断面形状が湾曲形状を有するとともに、前記湾曲形状の曲率半径が0.8〜1.2mmであり、
前記周縁部以外の部分の厚さが0.2〜0.4mmであり、
ショアA硬度が35以下である、
ことを特徴とする圧力検出チャンバ。
A pressure detection chamber used for pressure measurement in the blood circulation circuit.
Hollow detection container and
A diaphragm constituting a partition wall that divides the inside of the detection container into a blood chamber and an air chamber is provided.
The diaphragm is
Central membrane and
An uneven portion that surrounds the central membrane portion in an annular shape and has a wavy cross-sectional shape along the axis.
A peripheral portion constituting the outer peripheral portion of the diaphragm is provided.
The uneven portion has a plurality of annular convex portions provided in a convex shape toward the blood chamber side in a natural state in which blood pressure does not act on the diaphragm.
The uneven portion has a first annular convex portion and a second annular convex portion provided convexly on the blood chamber side as the annular convex portion, and the first annular convex portion has the central membrane portion annular. The second annular convex portion surrounds the first annular convex portion in a ring shape in the natural state .
Each of the annular convex portions has a curved cross-sectional shape along the axis, and the radius of curvature of the curved shape is 0.8 to 1.2 mm.
The thickness of the portion other than the peripheral portion is 0.2 to 0.4 mm, and the thickness is 0.2 to 0.4 mm.
Shore A hardness is 35 or less,
A pressure sensing chamber characterized by that.
請求項4記載の圧力検出チャンバにおいて、
前記凹凸部が有する前記環状凸部は、前記第1環状凸部及び前記第2環状凸部の2つのみである、
ことを特徴とする圧力検出チャンバ。
In the pressure detection chamber according to claim 4.
The concave-convex portion has only two annular convex portions, the first annular convex portion and the second annular convex portion.
A pressure sensing chamber characterized by that.
請求項5記載の圧力検出チャンバにおいて、
前記凹凸部は、前記環状凸部としてさらに、前記第1環状凸部と前記第2環状凸部との間に、前記空気室側に凸状に設けられた中間環状凸部を備える、
ことを特徴とする圧力検出チャンバ。
In the pressure detection chamber according to claim 5.
The uneven portion further includes, as the annular convex portion, an intermediate annular convex portion provided in a convex shape on the air chamber side between the first annular convex portion and the second annular convex portion.
A pressure sensing chamber characterized by that.
請求項4〜6のいずれか1項に記載の圧力検出チャンバにおいて、
前記検出容器は、内部に前記血液室が形成された血液容器部と、内部に前記空気室が形成された空気容器部とを有し、
前記血液容器部の前記空気容器部側の端部には外方に突出する第1フランジ部が設けられ、
前記空気容器部の前記血液容器部側の端部には外方に突出する第2フランジ部が設けられ、
前記ダイヤフラムの前記周縁部は、前記第1フランジ部と前記第2フランジ部との間に挟持され、
前記第1フランジ部の外周部と前記第2フランジ部の外周部とは、環状結合部材によって接合されている、
ことを特徴とする圧力検出チャンバ。
In the pressure detection chamber according to any one of claims 4 to 6.
The detection container has a blood container portion in which the blood chamber is formed, and an air container portion in which the air chamber is formed.
A first flange portion that projects outward is provided at the end portion of the blood container portion on the air container portion side.
A second flange portion that projects outward is provided at the end portion of the air container portion on the blood container portion side.
The peripheral edge portion of the diaphragm is sandwiched between the first flange portion and the second flange portion.
Wherein an outer peripheral portion of the first flange portion and the second flange portion outer peripheral portion of, and is joined by the ring-shaped coupling member,
A pressure sensing chamber characterized by that.
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