JP5976302B2

JP5976302B2 - Pressure detection device

Info

Publication number: JP5976302B2
Application number: JP2011251097A
Authority: JP
Inventors: 小林　進; 進小林; 胤之平
Original assignee: Top KK
Current assignee: Top KK
Priority date: 2011-11-16
Filing date: 2011-11-16
Publication date: 2016-08-23
Anticipated expiration: 2031-11-16
Also published as: JP2013103102A

Description

本発明は、輸液ポンプ等に用いられる圧力検出装置に関する。 The present invention relates to a pressure detection device used for an infusion pump or the like.

医療分野においては、薬液等を強制的に移送する輸液ポンプが広く用いられており、この種の輸液ポンプとしては、ペリスタルティックフィンガー方式を採用したものが挙げられる。ペリスタルティックフィンガー方式を採用した輸液ポンプでは、可撓性を有する輸液チューブの一側に複数の圧接フィンガーが圧接され、各圧接フィンガーを順次進退させることにより薬液等が移送される。 In the medical field, infusion pumps that forcibly transfer chemicals and the like are widely used, and examples of this type of infusion pump include those employing a peristaltic finger method. In an infusion pump adopting a peristaltic finger method, a plurality of pressure-contacting fingers are pressed against one side of a flexible infusion tube, and a chemical solution or the like is transferred by sequentially advancing and retracting each pressure-contacting finger.

この薬液等の移送時において、輸液チューブが捩じれ、折れ曲がりや詰まりによって閉塞すると、患者への正確な輸液ができなくなる。そのため、輸液ポンプには、輸液チューブ内の薬液等の圧力を検出して輸液チューブの閉塞を検出する圧力検出装置が設けられる。 If the liquid transfusing tube is twisted and closed due to bending or clogging during the transfer of the drug solution or the like, accurate transfusion to the patient cannot be performed. Therefore, the infusion pump is provided with a pressure detection device that detects the pressure of the liquid medicine in the infusion tube and detects the blockage of the infusion tube.

従来知られている輸液チューブ内の薬液等の圧力を検出する装置として、歪ゲージを使用したものが知られている（特許文献１）。この歪ゲージは、輸液チューブを軽く潰すように輸液チューブに当接された板バネに接着している。また、歪ゲージの抵抗値は板バネからの押圧力を受けて変形することにより変動する。従って、歪ゲージを使用することにより、輸液チューブの内圧の増加を検出することができる。 A device using a strain gauge is known as a conventionally known device for detecting the pressure of a drug solution or the like in an infusion tube (Patent Document 1). The strain gauge is bonded to a leaf spring that is in contact with the infusion tube so as to lightly crush the infusion tube. Further, the resistance value of the strain gauge fluctuates due to deformation by receiving a pressing force from the leaf spring. Therefore, an increase in the internal pressure of the infusion tube can be detected by using the strain gauge.

また、特許文献１の従来例には、輸液チューブの閉塞を検出する他の装置として、リンク機構を使用したものが開示されている。このリンク機構は、角Ｃ字状のレバーが支軸部を介して回動可能に取り付けられ、このレバーの折り曲げられた両端部がそれぞれ圧接フィンガーの上流側及び下流側で輸液チューブに当接する機構である。 In addition, the conventional example of Patent Document 1 discloses a device using a link mechanism as another device for detecting the blockage of an infusion tube. This link mechanism is a mechanism in which a square C-shaped lever is rotatably attached via a support shaft, and both bent ends of the lever are in contact with the infusion tube on the upstream side and the downstream side of the pressure contact finger, respectively. It is.

そして、上流側の圧力が減少して輸液チューブがつぶれ、又は下流側の輸液チューブの圧力が増加して輸液チューブの径が復元することでレバーが傾き、このレバーの傾きを支軸部に設けられた変位センサで検出することで、輸液チューブの閉塞を検出することができる。 Then, the pressure on the upstream side decreases and the infusion tube is crushed, or the pressure on the downstream side infusion tube increases and the diameter of the infusion tube is restored, so that the lever is tilted. The occlusion of the infusion tube can be detected by detecting the displacement sensor.

さらに、輸液チューブの閉塞を検出する他の装置として、磁気素子を使用したものが知られている（特許文献２）。この磁気素子は、輸液チューブに当接された移動子と共に移動するマグネットから生じる磁場の強さの変化に応じて電気信号を出力するものであり、この電気信号によって輸液チューブの閉塞が検出される。 Further, as another device for detecting the blockage of an infusion tube, a device using a magnetic element is known (Patent Document 2). This magnetic element outputs an electrical signal in accordance with a change in the strength of a magnetic field generated from a magnet that moves together with a moving element that is in contact with the infusion tube, and the occlusion of the infusion tube is detected by this electrical signal. .

実開平１−１７０２４８号公報Japanese Utility Model Publication No. 1-170248 特開平６−３０９９３号公報JP-A-6-30993

しかしながら、歪ゲージを用いたものでは歪ゲージの抵抗変化は小さいため、輸液チューブの内圧が増加した場合であっても、輸液チューブの閉塞を検出する際に高い検出精度を得ることができない。 However, in the case of using a strain gauge, since the resistance change of the strain gauge is small, even when the internal pressure of the infusion tube increases, high detection accuracy cannot be obtained when detecting the blockage of the infusion tube.

また、輸液チューブの内圧の増減をリンク機構で検出する場合には、輸液チューブの内圧の増減による変形は微小であるため、レバーの両端部の移動量を増幅させて検知する必要がある。従って、レバーの両端部の移動量を増幅させるためのリンク機構を追加する必要があり、装置が大型化する。 In addition, when detecting the increase / decrease in the internal pressure of the infusion tube by the link mechanism, since the deformation due to the increase / decrease in the internal pressure of the infusion tube is very small, it is necessary to detect by amplifying the amount of movement of both ends of the lever. Therefore, it is necessary to add a link mechanism for amplifying the amount of movement of both ends of the lever, and the apparatus becomes large.

また、リンク機構ではレバーの両端部の移動量を増幅しているため、当該リンク機構が振動等の影響を受けやすい。従って、周囲に振動源があると輸液チューブの内圧の増減を正確に検出することができず、輸液チューブの閉塞を高い精度で検出することができない。 Also, since the link mechanism amplifies the amount of movement of both ends of the lever, the link mechanism is easily affected by vibration and the like. Therefore, if there is a vibration source in the vicinity, the increase or decrease in the internal pressure of the infusion tube cannot be detected accurately, and the blockage of the infusion tube cannot be detected with high accuracy.

さらに、磁気素子を用いた場合、磁気素子の距離に対する出力特性がリニアとならない部分を有しているため、磁気素子とマグネットとの距離が所定の範囲から外れた場合には比例関係は成立しない。そのため、磁気素子を用いて輸液チューブの閉塞を検出する場合には、磁気素子とマグネットとの距離が一定の範囲内になるように磁気素子とマグネットの位置を調整しなければならず、設計上の制限が生じる。 Furthermore, when a magnetic element is used, there is a portion where the output characteristics with respect to the distance of the magnetic element are not linear, and therefore the proportional relationship is not established when the distance between the magnetic element and the magnet is out of a predetermined range. . Therefore, when detecting blockage of an infusion tube using a magnetic element, the position of the magnetic element and the magnet must be adjusted so that the distance between the magnetic element and the magnet is within a certain range. Limitation occurs.

本発明は、上記背景に鑑みてなされたものであり、輸液チューブの閉塞を高い精度で検出することを可能とした圧力検出装置を提供することを目的とする。 The present invention has been made in view of the above background, and an object of the present invention is to provide a pressure detection device that can detect the blockage of an infusion tube with high accuracy.

本発明の圧力検出装置は、表面に輸液チューブが当接される受圧板と、前記受圧板の裏面に当接して荷重を検出するフォースセンサと、前記受圧板と前記フォースセンサを収納するケースとを備え、前記輸液チューブの内圧を検出する圧力検出装置であって、前記受圧板は、前記輸液チューブの外周面が当接される受圧部と、前記受圧部の周囲を囲むスリットと、前記スリットの外周側に設けられた外周部と、前記外周部と前記受圧部とを連結する連結部とを有しており、前記受圧部と、前記外周部と、前記連結部とは、板状部材として一体的に形成されており、内圧の変化で変形した前記輸液チューブに前記受圧部が押圧されることによって、前記連結部が弾性変形すると共に前記受圧部が前記外周部に対して前記フォースセンサ側に移動し、前記受圧部と当接する前記フォースセンサにより荷重が検出されることを特徴とする。
また、本発明の圧力検出装置は、表面に輸液チューブが当接される受圧板と、前記受圧板の裏面に当接して荷重を検出するフォースセンサと、前記受圧板と前記フォースセンサを収納するケースとを備え、前記輸液チューブの内圧を検出する圧力検出装置であって、前記受圧板は、前記輸液チューブの外周面が当接される受圧部と、前記受圧部の周囲を囲むＣ字形状のスリットと、前記スリットの外周側に設けられた外周部と、前記外周部と前記受圧部とを連結する連結部とを有しており、前記受圧部と、前記外周部と、前記連結部とは、板状部材として一体的に形成されており、内圧の変化で変形した前記輸液チューブに前記受圧部が押圧されることによって、前記連結部が弾性変形すると共に前記受圧部が前記外周部に対して前記フォースセンサ側に移動し、前記受圧部と当接する前記フォースセンサにより荷重が検出されることを特徴とする。 The pressure detection device of the present invention includes a pressure receiving plate with which an infusion tube abuts a surface, a force sensor that abuts against the back surface of the pressure receiving plate to detect a load, and a case that houses the pressure receiving plate and the force sensor. wherein the a pressure detecting device for detecting the internal pressure of the infusion tube, wherein the pressure receiving plate, a pressure receiving portion outer peripheral surface of the front Symbol infusion tube is abutting, the slit surrounding the pressure receiving portion, said The outer peripheral part provided in the outer peripheral side of a slit, and the connection part which connects the said outer peripheral part and the said pressure receiving part, and the said pressure receiving part, the said outer peripheral part, and the said connection part are plate-shaped. are integrally formed as a member, depending on the pressure receiving portion in the infusion tube which is deformed by a change in internal pressure is pressed against the pressure receiving portion is the outer peripheral portion with the connection portion is elastically deformed It moved to the force sensor side Characterized in that the load is detected by the force sensor into contact with the pressure receiving portion.
The pressure detection device of the present invention houses a pressure receiving plate with which an infusion tube abuts on the surface, a force sensor that abuts against the back surface of the pressure receiving plate to detect a load, the pressure receiving plate, and the force sensor. A pressure detecting device for detecting an internal pressure of the infusion tube, wherein the pressure receiving plate is a C-shaped portion surrounding a periphery of the pressure receiving portion, a pressure receiving portion with which an outer peripheral surface of the infusion tube abuts A slit, an outer peripheral portion provided on the outer peripheral side of the slit, and a connecting portion that connects the outer peripheral portion and the pressure receiving portion, and the pressure receiving portion, the outer peripheral portion, and the connecting portion. Is integrally formed as a plate-like member, and when the pressure receiving portion is pressed against the infusion tube deformed by a change in internal pressure, the connecting portion is elastically deformed and the pressure receiving portion is the outer peripheral portion. Against the four Go to the sensor side, characterized in that the load is detected by the force sensor into contact with the pressure receiving portion.

当該構成によれば、内圧の変化で変形した輸液チューブの外周面が受圧部に当接されるため、輸液チューブの外周面と受圧部とが面接触する。従って、輸液チューブの内圧を効率よく受圧部に伝達させることができ、フォースセンサで検出される荷重の精度が向上する。 According to this configuration, since the outer peripheral surface of the transportation liquid tube deformed by the change in the internal pressure is brought into contact with the pressure receiving portion, and the outer peripheral surface and the pressure receiving portion of the infusion tube is in surface contact. Therefore, the internal pressure of the infusion tube can be efficiently transmitted to the pressure receiving portion, and the accuracy of the load detected by the force sensor is improved.

また、当該構成によれば、輸液チューブの内圧の変化によって、連結部が弾性変形すると共に受圧部が外周部に対してフォースセンサ側に移動する。即ち、連結部は受圧部に比べて弾性変形が極めて大きいため、受圧部は実質的に撓むことなく平行移動する。このため、フォースセンサには常に受圧部から一定の方向の力が加わるので、チューブ内圧の変化により生じる荷重の変化を極めて正確に検出することができる。 Moreover, according to the said structure, a connection part elastically deforms and the pressure receiving part moves to the force sensor side with respect to an outer peripheral part by the change of the internal pressure of an infusion tube. That is, since the connecting portion is much more elastically deformed than the pressure receiving portion, the pressure receiving portion moves in parallel without substantially bending. For this reason, since a force in a certain direction is always applied to the force sensor from the pressure receiving portion, a change in load caused by a change in the tube internal pressure can be detected very accurately.

さらに、当該構成によれば、受圧部と外周部と連結部とは、板状部材として一体的に形成されているため、例えばエッチングによるスリット形成時において、受圧部が外周部から分離することを防止することができる。従って、受圧板を容易に製造することができる。Further, according to the configuration, the pressure receiving portion, the outer peripheral portion, and the connecting portion are integrally formed as a plate-like member, and therefore, for example, when the slit is formed by etching, the pressure receiving portion is separated from the outer peripheral portion. Can be prevented. Therefore, the pressure receiving plate can be easily manufactured.

本発明の圧力検出装置は、表面に輸液チューブが当接される受圧板と、前記受圧板の裏面に当接して荷重を検出するフォースセンサと、前記受圧板と前記フォースセンサを収納するケースとを備え、前記輸液チューブの内圧を検出する圧力検出装置であって、前記受圧板は、押圧されて長円形状に変形した前記輸液チューブの外周面が当接される受圧部と、前記受圧部の周囲を囲むスリットと、前記スリットの外周側に設けられた外周部と、前記外周部と前記受圧部とを連結する連結部とを有し、前記輸液チューブの内圧の変化によって、前記連結部が弾性変形すると共に前記受圧部が前記外周部に対して実質的に平行に移動し、前記受圧部と当接する前記フォースセンサにより荷重が検出され、前記スリットは、前記輸液チューブの輸液方向に沿って設けられた長辺部と、前記長辺部の両端部から前記輸液チューブの径方向に延びる短辺部とを備えた角Ｃ形状に形成されたスリット単体が一対並列されてなり、前記スリット単体は、互いに前記短辺部が他方のスリット単体側に向けられると共に、前記チューブの輸液方向にオフセットされ、前記連結部は、互いに向かい合う一方のスリット単体の短辺部と他方のスリット単体の短辺部との間に形成されることを特徴とする。 Case pressure detection equipment of the present invention, an infusion tube surface for accommodating a pressure receiving plate which is contact, a force sensor for detecting a load in contact with the back surface of the pressure receiving plate, said force sensor and said pressure receiving plate A pressure detecting device for detecting an internal pressure of the infusion tube, wherein the pressure receiving plate is pressed and deformed into an oval shape, and a pressure receiving portion with which an outer peripheral surface of the infusion tube abuts, and the pressure receiving A slit that surrounds the periphery of the part, an outer peripheral part provided on the outer peripheral side of the slit, and a connecting part that connects the outer peripheral part and the pressure receiving part, and the connection by the change in the internal pressure of the infusion tube part is substantially moved parallel to the pressure receiving portion is the outer peripheral portion with elastically deformed, the load is detected by the force sensor into contact with the pressure receiving portion, said slit infusion sides of the infusion tube A pair of slit single bodies formed in a corner C shape having a long side portion provided along the long side portion and a short side portion extending in the radial direction of the infusion tube from both ends of the long side portion, The single slit has its short sides directed toward the other single slit and is offset in the infusion direction of the tube, and the connecting portion has the short side and the other single slit facing each other. It is characterized in that it is formed between the short side portion.

当該構成によれば、押圧されて長円形状に変形した前記輸液チューブの外周面が受圧部に当接されるため、輸液チューブの外周面と受圧部とが面接触する。従って、輸液チューブの内圧を効率よく受圧部に伝達させることができ、フォースセンサで検出される荷重の精度が向上する。
また、当該構成によれば、輸液チューブの内圧の変化によって、連結部が弾性変形すると共に受圧部が外周部に対して実質的に平行に移動する。即ち、連結部は受圧部に比べて弾性変形が極めて大きいため、受圧部は実質的に撓むことなく平行移動する。このため、フォースセンサには常に受圧部から一定の方向の力が加わるので、チューブ内圧の変化により生じる荷重の変化を極めて正確に検出することができる。
当該構成によれば、前記連結部は、互いに向かい合う一方のスリット単体の短辺部と他方のスリット単体の短辺部との間に形成されているため、例えばエッチングによるスリット形成時において、受圧部が外周部から分離することを防止することができる。従って、受圧板を容易に製造することができる。 According to the said structure, since the outer peripheral surface of the said infusion tube which was pressed and deform | transformed into the ellipse shape is contact | abutted to a pressure receiving part, the outer peripheral surface of an infusion tube and a pressure receiving part surface-contact. Therefore, the internal pressure of the infusion tube can be efficiently transmitted to the pressure receiving portion, and the accuracy of the load detected by the force sensor is improved.
Moreover, according to the said structure, a connection part elastically deforms and a pressure receiving part moves substantially parallel with respect to an outer peripheral part by the change of the internal pressure of an infusion tube. That is, since the connecting portion is much more elastically deformed than the pressure receiving portion, the pressure receiving portion moves in parallel without substantially bending. For this reason, since a force in a certain direction is always applied to the force sensor from the pressure receiving portion, a change in load caused by a change in the tube internal pressure can be detected very accurately.
According to this configuration, since the connecting portion is formed between the short side portion of one slit alone and the short side portion of the other slit facing each other, for example, when forming a slit by etching, the pressure receiving portion Can be prevented from separating from the outer periphery. Therefore, the pressure receiving plate can be easily manufactured.

また、本発明の圧力検出装置では、前記スリットが角Ｃ形状に形成されたスリット単体が一対並列されてなる構成の場合、前記連結部は、前記受圧板の表面又は裏面に設けられ前記スリットを覆う可撓性の膜部材により形成されていることが好ましい。当該構成によれば、連結部が可撓性の膜部材で形成されているため、輸液チューブの内圧によって膜部材からなる連結部が撓む。そのため、輸液チューブの内圧による受圧部の撓みが防止され、受圧部をフォースセンサに対して垂直に当接させることができる。 Further, in the pressure detection device according to the present invention, in the case where a pair of slits each having a C-shaped slit is formed in parallel, the connecting portion is provided on the front surface or the back surface of the pressure receiving plate. It is preferable that it is formed of a flexible film member that covers it. According to the said structure, since the connection part is formed with the flexible membrane member, the connection part which consists of a membrane member bends with the internal pressure of an infusion tube. Therefore, bending of the pressure receiving portion due to the internal pressure of the infusion tube is prevented, and the pressure receiving portion can be brought into perpendicular contact with the force sensor.

また、本発明の圧力検出装置では、前記ケースと前記受圧板は一体形成されていることが好ましい。当該構成によれば、ケースと受圧板が一体形成されているため、受圧板の裏面側に対する防水・防滴効果を得ることができる。 In the pressure detection device of the present invention, it is preferable that the case and the pressure receiving plate are integrally formed. According to this configuration, since the case and the pressure receiving plate are integrally formed, a waterproof / drip-proof effect on the back side of the pressure receiving plate can be obtained.

また、本発明の圧力検出装置では、前記ケースには、前記輸液チューブの直径よりも大きい幅と前記輸液チューブの直径よりも小さい深さを有し、前記受圧板を底面とする収納凹部が形成され、前記収納凹部に前記輸液チューブが挿入されていてもよい。当該構成によれば、輸液チューブが収納凹部に挿入されるため、収納凹部がチューブを保持するためのガイドの役割を有する。 In the pressure detection device of the present invention, the case has a housing recess having a width larger than the diameter of the infusion tube and a depth smaller than the diameter of the infusion tube, and the pressure receiving plate as a bottom surface. The infusion tube may be inserted into the storage recess. According to the said structure, since an infusion tube is inserted in a storage recessed part, a storage recessed part has a role of the guide for hold | maintaining a tube.

本発明の第１の実施形態に係る輸液ポンプの斜視図。1 is a perspective view of an infusion pump according to a first embodiment of the present invention. 本発明の第１の実施形態に係る圧力検出装置の概略説明図。BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the pressure detection apparatus which concerns on the 1st Embodiment of this invention. 図２に示す圧力検出装置の平面図。The top view of the pressure detection apparatus shown in FIG. 図３に示す圧力検出装置のＩＶ-ＩＶ線矢視断面図。FIG. 4 is a cross-sectional view taken along line IV-IV of the pressure detection device illustrated in FIG. 3. 本発明の第１の実施形態に係る受圧板を説明するための説明図。Explanatory drawing for demonstrating the pressure receiving plate which concerns on the 1st Embodiment of this invention. 本発明の第１の実施形態に係る圧力検出装置の動作を説明するための説明図。Explanatory drawing for demonstrating operation | movement of the pressure detection apparatus which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る受圧板を説明するための説明図。Explanatory drawing for demonstrating the pressure receiving plate which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る受圧板を説明するための説明図。Explanatory drawing for demonstrating the pressure receiving plate which concerns on the 3rd Embodiment of this invention.

［第１の実施形態］
第１の実施形態について図１〜図６を用いて説明する。図１に示される輸液ポンプ１には、輸液チューブ２内の液体を圧接によって強制的に移送させるためのポンプフィンガー３と、ポンプフィンガー３に対向して設けられるドア４と、稼働状態を表示するための表示部５と、輸液チューブ２の内圧を検出する圧力検出装置６が設けられている。また、輸液ポンプ１には、図示しない中央演算処理装置（ＣＰＵ）及び記憶装置（メモリ）が設けられている。 [First Embodiment]
A first embodiment will be described with reference to FIGS. The infusion pump 1 shown in FIG. 1 displays a pump finger 3 for forcibly transferring the liquid in the infusion tube 2 by pressure contact, a door 4 provided facing the pump finger 3, and an operating state. For this purpose, a display unit 5 and a pressure detection device 6 for detecting the internal pressure of the infusion tube 2 are provided. The infusion pump 1 is provided with a central processing unit (CPU) and a storage device (memory) not shown.

ポンプフィンガー３は、ペリスタルティックフィンガー式のものが用いられている。ポンプフィンガー３は、輸液チューブ２に沿って上下方向に配列されている。 The pump finger 3 is a peristaltic finger type. The pump fingers 3 are arranged in the vertical direction along the infusion tube 2.

ドア４は輸液ポンプ１の前面に開閉自在に取り付けられている。このドア４のポンプフィンガー３及び圧力検出装置６に対向する位置には、保持部材７、８が取り付けられている。保持部材７、８はドア４を閉じる際に輸液チューブ２を押圧する。輸液チューブ２は保持部材８に押圧されることで圧力検出装置６に保持される。 The door 4 is attached to the front surface of the infusion pump 1 so as to be freely opened and closed. Holding members 7 and 8 are attached to the door 4 at positions facing the pump fingers 3 and the pressure detection device 6. The holding members 7 and 8 press the infusion tube 2 when the door 4 is closed. The infusion tube 2 is held by the pressure detection device 6 by being pressed by the holding member 8.

圧力検出装置６は、輸液ポンプ１の前面であって、ポンプフィンガー３の下流側に取り付けられている。 The pressure detection device 6 is attached to the front surface of the infusion pump 1 and downstream of the pump finger 3.

図２〜図４を用いて、圧力検出装置６の構成について説明する。圧力検出装置６は、ケース９と、フォースセンサ１０と、基板１１、１２と、コネクター１３、１４と、受圧板１５とを備えている。ケース９、フォースセンサ１０、基板１１、１２、コネクター１３、１４、受圧板１５は、ケース９に収納されている。 The configuration of the pressure detection device 6 will be described with reference to FIGS. The pressure detection device 6 includes a case 9, a force sensor 10, substrates 11 and 12, connectors 13 and 14, and a pressure receiving plate 15. The case 9, the force sensor 10, the substrates 11 and 12, the connectors 13 and 14, and the pressure receiving plate 15 are accommodated in the case 9.

ケース９は輸液チューブ２を収納する収納凹部１７を天面１６に有し、略直方体に形成されている。また、ケース９の内部には中空部１８が形成されている。収納凹部１７の中空部１８側には開口部１８ａが形成されており、さらに収納凹部１７には側壁１９が設けられている。即ち、収納凹部１７と中空部１８とは開口部１８ａを介して連通している。 The case 9 has a storage recess 17 for storing the infusion tube 2 on the top surface 16 and is formed in a substantially rectangular parallelepiped. A hollow portion 18 is formed inside the case 9. An opening 18 a is formed on the hollow portion 18 side of the storage recess 17, and a side wall 19 is provided in the storage recess 17. That is, the storage recess 17 and the hollow portion 18 communicate with each other through the opening 18a.

中空部１８には受圧板１５が収納されており、この受圧板１５によって開口部１８ａが塞がれている。即ち、受圧板１５は収納凹部１７の底面を構成する。 A pressure receiving plate 15 is accommodated in the hollow portion 18, and the opening 18 a is closed by the pressure receiving plate 15. That is, the pressure receiving plate 15 constitutes the bottom surface of the storage recess 17.

側壁１９の高さは輸液チューブ２の直径よりも低くなるように形成される。また、互いの側壁１９の間隔は輸液チューブ２の直径よりも大きくなるように形成される。即ち、収納凹部１７は、輸液チューブ２の直径よりも大きい幅と輸液チューブ２の直径よりも小さい深さを有する。 The height of the side wall 19 is formed to be lower than the diameter of the infusion tube 2. Further, the interval between the side walls 19 is formed to be larger than the diameter of the infusion tube 2. That is, the storage recess 17 has a width larger than the diameter of the infusion tube 2 and a depth smaller than the diameter of the infusion tube 2.

フォースセンサ１０は略直方体に形成されており、フォースセンサ１０の高さは中央付近の中央部２０で高くなる。この中央部２０の上部には球体２１が設けられており、この球体２１の上側がフォースセンサ１０の中央部２０から突出している。球体２１は受圧板１５の裏面に当接されており、荷重を受けることでフォースセンサ１０の高さ方向に変位し、図示しないダイヤフラム部に荷重を伝達する。このダイヤフラム部は伝達された荷重によって変形し、ピエゾ抵抗効果によって電気信号に変換される。 The force sensor 10 is formed in a substantially rectangular parallelepiped, and the height of the force sensor 10 increases at the central portion 20 near the center. A spherical body 21 is provided on the upper portion of the central portion 20, and the upper side of the spherical body 21 protrudes from the central portion 20 of the force sensor 10. The spherical body 21 is in contact with the back surface of the pressure receiving plate 15 and is displaced in the height direction of the force sensor 10 by receiving a load, and transmits the load to a diaphragm portion (not shown). This diaphragm portion is deformed by the transmitted load and is converted into an electric signal by the piezoresistive effect.

なお、本実施形態ではシリコンダイアフラム式のフォースセンサ１０を用いた場合について説明しているが、フォースセンサ１０としてはこれに限られず、例えばロードセル等であってもよい。 In the present embodiment, the case where the silicon diaphragm type force sensor 10 is used has been described. However, the force sensor 10 is not limited to this, and may be a load cell, for example.

基板１１、１２には、フォースセンサ１０からの信号をコネクター１３、１４及び配線２２を介して輸液ポンプ１の中央演算処理装置（ＣＰＵ）に伝達するための回路が形成されている。基板１１の中央には挿入孔２３が形成され、この挿入孔２３にフォースセンサ１０が装着されている。フォースセンサ１０は半田付けによって基板１２の天面１６側の面に取り付けられている。 Circuits for transmitting signals from the force sensor 10 to the central processing unit (CPU) of the infusion pump 1 through the connectors 13 and 14 and the wiring 22 are formed on the substrates 11 and 12. An insertion hole 23 is formed in the center of the substrate 11, and the force sensor 10 is attached to the insertion hole 23. The force sensor 10 is attached to the surface on the top surface 16 side of the substrate 12 by soldering.

基板１１、１２は重ねられてケース９の中空部１８に収納される。また、フォースセンサ１０の球体２１の先端と基板１１の表面とは略面一になるように配置される。さらに、受圧板１５は基板１１とケース９との間に挟まれて中空部１８に収納される。従って、受圧板１５とフォースセンサ１０は中空部１８に収納される。 The substrates 11 and 12 are stacked and stored in the hollow portion 18 of the case 9. Further, the tip of the sphere 21 of the force sensor 10 and the surface of the substrate 11 are disposed so as to be substantially flush with each other. Further, the pressure receiving plate 15 is sandwiched between the substrate 11 and the case 9 and stored in the hollow portion 18. Therefore, the pressure receiving plate 15 and the force sensor 10 are accommodated in the hollow portion 18.

図４〜６を用いて、受圧板１５について説明する。受圧板１５は、輸液チューブ２の外周面２ａが当接される受圧部２６と、受圧部２６の周囲を囲むスリット２４と、スリット２４の外周側に設けられた外周部４０と、外周部４０と受圧部２６とを連結する連結部４１を有する。なお、受圧板１５の材質としては、例えばステンレス鋼のような非腐食性の材質が望ましい。 The pressure receiving plate 15 will be described with reference to FIGS. The pressure receiving plate 15 includes a pressure receiving portion 26 with which the outer peripheral surface 2a of the infusion tube 2 abuts, a slit 24 surrounding the pressure receiving portion 26, an outer peripheral portion 40 provided on the outer peripheral side of the slit 24, and an outer peripheral portion 40. And a pressure receiving part 26 are connected. As the material of the pressure receiving plate 15, a non-corrosive material such as stainless steel is desirable.

受圧部２６は角丸長方形に形成されている。また、受圧部２６は受圧板１５の中央に設けられているため、受圧部２６の中心と受圧板１５の中心とは一致する。受圧部２６の向きは、受圧部２６の長辺が輸液チューブ２の輸液方向と並行となるように形成される。 The pressure receiving portion 26 is formed in a rounded rectangular shape. Further, since the pressure receiving portion 26 is provided at the center of the pressure receiving plate 15, the center of the pressure receiving portion 26 and the center of the pressure receiving plate 15 coincide. The direction of the pressure receiving portion 26 is formed such that the long side of the pressure receiving portion 26 is parallel to the infusion direction of the infusion tube 2.

受圧部２６の外周側には角丸長方形に形成されたスリット２４が設けられているため、スリット２４は受圧板１５の中心に対して点対称の形状となる。また、スリット２４はケース９の収納凹部１７に現れるように位置している。スリット２４は、受圧板１５にエッチング加工を施すことによって形成される。 Since the slit 24 formed in the rounded rectangle is provided on the outer peripheral side of the pressure receiving portion 26, the slit 24 has a point-symmetric shape with respect to the center of the pressure receiving plate 15. Further, the slit 24 is positioned so as to appear in the housing recess 17 of the case 9. The slit 24 is formed by etching the pressure receiving plate 15.

スリット２４の外周側には、外周部４０が設けられている。外周部４０の端部はケース９に固定されている。 An outer peripheral portion 40 is provided on the outer peripheral side of the slit 24. An end portion of the outer peripheral portion 40 is fixed to the case 9.

外周部４０及び受圧部２６の表面には、シリコンフィルムやポリエステルフィルム等からなる可撓性の膜部材３０が貼り付けられている。膜部材３０はスリット２４を覆うように貼り付けられており、受圧部２６は膜部材３０を介して外周部４０と連結されている。本実施形態では、受圧部２６と外周部４０とを連結する膜部材３０が連結部４１に相当する。 A flexible membrane member 30 made of a silicon film, a polyester film, or the like is attached to the surfaces of the outer peripheral portion 40 and the pressure receiving portion 26. The membrane member 30 is attached so as to cover the slit 24, and the pressure receiving portion 26 is connected to the outer peripheral portion 40 through the membrane member 30. In the present embodiment, the membrane member 30 that connects the pressure receiving portion 26 and the outer peripheral portion 40 corresponds to the connecting portion 41.

なお、第１の実施形態では、膜部材３０は外周部４０及び受圧部２６の表面に貼り付けられているが、外周部４０及び受圧部２６の裏面に貼り付けられていてもよい。 In the first embodiment, the membrane member 30 is attached to the outer peripheral portion 40 and the pressure receiving portion 26, but may be attached to the outer peripheral portion 40 and the back surface of the pressure receiving portion 26.

図６（ａ）に示すように、輸液チューブ２は、バネ３１を介してドア４に取り付けられている保持部材８、側壁１９及び受圧板１５によって挟持される。このとき、側壁１９の高さは輸液チューブ２の直径よりも低いため、輸液チューブ２は保持部材８によって押圧されて変形する。変形した輸液チューブ２の外周面２ａは受圧部２６及び側壁１９に密着するため、輸液チューブ２の形状は略長円形となる。このように、輸液チューブ２が収納凹部１７に挿入されるため、収納凹部１７がチューブを保持するためのガイドの役割を有する。 As shown in FIG. 6A, the infusion tube 2 is sandwiched between the holding member 8, the side wall 19, and the pressure receiving plate 15 that are attached to the door 4 via a spring 31. At this time, since the height of the side wall 19 is lower than the diameter of the infusion tube 2, the infusion tube 2 is pressed and deformed by the holding member 8. Since the outer peripheral surface 2a of the deformed infusion tube 2 is in close contact with the pressure receiving portion 26 and the side wall 19, the shape of the infusion tube 2 is substantially oval. Thus, since the infusion tube 2 is inserted into the storage recess 17, the storage recess 17 serves as a guide for holding the tube.

図６を用いて、圧力検出装置６の動作について説明する。図６（ａ）には、輸液チューブ２の内圧が上昇しておらず、輸液チューブ２の径が増加していない場合の圧力検出装置６が示されている。 The operation of the pressure detection device 6 will be described with reference to FIG. FIG. 6A shows the pressure detection device 6 when the internal pressure of the infusion tube 2 has not increased and the diameter of the infusion tube 2 has not increased.

図６（ａ）に示すように、輸液チューブ２はバネ３１を介してドア４に取り付けられている保持部材８によって付勢されており、輸液チューブ２は保持部材８、収納凹部１７及び受圧板１５によって挟持されている。また、フォースセンサ１０の球体２１は受圧部２６の中心で当接している。 As shown in FIG. 6 (a), the infusion tube 2 is urged by a holding member 8 attached to the door 4 via a spring 31, and the infusion tube 2 includes the holding member 8, the storage recess 17 and the pressure receiving plate. 15. The spherical body 21 of the force sensor 10 is in contact with the center of the pressure receiving portion 26.

図６（ｂ）に示すように、輸液チューブ２が何らかの原因で閉塞すると、輸液チューブ２の内圧が上昇して、輸液チューブ２の径が増加する。このとき、外周部４０と受圧部２６は可撓性の膜部材３０によって連結されているため、受圧部２６が押され、膜部材３０が弾性変形をしてフォースセンサ１０に近接する方向に撓む。そのため、受圧部２６は外周部４０に対して実質的に平行に移動し、受圧部２６がフォースセンサ１０側に押される。 As shown in FIG. 6B, when the infusion tube 2 is blocked for some reason, the internal pressure of the infusion tube 2 increases and the diameter of the infusion tube 2 increases. At this time, since the outer peripheral portion 40 and the pressure receiving portion 26 are connected by the flexible membrane member 30, the pressure receiving portion 26 is pushed, and the membrane member 30 is elastically deformed and bent in the direction approaching the force sensor 10. Mu Therefore, the pressure receiving part 26 moves substantially parallel to the outer peripheral part 40, and the pressure receiving part 26 is pushed to the force sensor 10 side.

図６（ａ）、（ｂ）に示されるような輸液チューブ２の閉塞の有無は、ピエゾ抵抗効果によって出力される電気信号の電圧に基づいて判断される。 The presence or absence of blockage of the infusion tube 2 as shown in FIGS. 6A and 6B is determined based on the voltage of the electrical signal output by the piezoresistance effect.

まず、ポンプフィンガー３を稼働させる前の状態でフォースセンサ１０から出力された電気信号の電圧Ｖ０が検出され、図示しない記憶装置（メモリ）に記憶される。次に、ポンプフィンガー３を稼働させた状態でフォースセンサ１０から出力された電気信号の電圧Ｖｓが検出される。輸液チューブ２が閉塞しているか否かについては、電圧Ｖｓと電圧Ｖ０との差に基づいて、図示しないＣＰＵで判断される。 First, the voltage V0 of the electric signal output from the force sensor 10 in a state before operating the pump finger 3 is detected and stored in a storage device (memory) (not shown). Next, the voltage Vs of the electric signal output from the force sensor 10 in a state where the pump finger 3 is operated is detected. Whether or not the infusion tube 2 is blocked is determined by a CPU (not shown) based on the difference between the voltage Vs and the voltage V0.

電圧Ｖ０とＶｓとの差が所定の閾値を超えた場合には、輸液チューブ２が閉塞したと判断し、使用者に輸液チューブ２の閉塞が告知される。告知の方法は表示部での表示であってもよいし、音による告知であってもよい。また、表示と音による告知の両方を用いてもよい。 When the difference between the voltages V0 and Vs exceeds a predetermined threshold value, it is determined that the infusion tube 2 is blocked, and the user is notified of the infusion tube 2 being blocked. The notification method may be display on a display unit or notification by sound. Both display and sound notification may be used.

以上のように、第１の実施形態によれば、収納凹部１７の深さは輸液チューブ２の直径よりも小さいため、輸液チューブ２が潰れる。そのため、輸液チューブ２の閉塞時に、輸液チューブ２を潰さない場合と比較して輸液チューブの内圧が増大し、輸液チューブ２の径が増大する。従って、輸液チューブの圧力検出精度が向上する。 As mentioned above, according to 1st Embodiment, since the depth of the storage recessed part 17 is smaller than the diameter of the infusion tube 2, the infusion tube 2 is crushed. Therefore, when the infusion tube 2 is closed, the internal pressure of the infusion tube increases as compared with the case where the infusion tube 2 is not crushed, and the diameter of the infusion tube 2 increases. Therefore, the pressure detection accuracy of the infusion tube is improved.

また、第１の実施形態によれば、押圧されて長円形状に変形した輸液チューブ２の外周面２ａが受圧部２６に当接されるため、輸液チューブ２の外周面２ａと受圧部２６とが面接触する。従って、輸液チューブ２の内圧を効率よく受圧部２６に伝達させることができ、フォースセンサ１０で検出される荷重の精度が向上する。 In addition, according to the first embodiment, the outer peripheral surface 2a of the infusion tube 2 that has been pressed and deformed into an oval shape is brought into contact with the pressure receiving portion 26, so that the outer peripheral surface 2a of the infusion tube 2 and the pressure receiving portion 26 are Makes surface contact. Therefore, the internal pressure of the infusion tube 2 can be efficiently transmitted to the pressure receiving portion 26, and the accuracy of the load detected by the force sensor 10 is improved.

また、第１の実施形態によれば、輸液チューブ２の内圧の変化によって、膜部材３０が弾性変形すると共に受圧部２６が外周部４０に対して実質的に平行に移動する。そのため、フォースセンサ１０には常に受圧部２６から一定の方向の力が加わるので、輸液チューブ２の内圧の変化により生じる荷重の変化を極めて正確に検出することができる。 Further, according to the first embodiment, the membrane member 30 is elastically deformed and the pressure receiving portion 26 moves substantially parallel to the outer peripheral portion 40 due to a change in the internal pressure of the infusion tube 2. Therefore, a force in a certain direction is always applied to the force sensor 10 from the pressure receiving portion 26, so that a change in load caused by a change in the internal pressure of the infusion tube 2 can be detected very accurately.

［第２の実施形態］
次に、図７を参照して、本発明の第２実施形態について説明する。 [Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.

第２実施形態の受圧板１５に設けられたスリット２４ａ、２４ｂは、輸液チューブ２の輸液方向に沿って設けられた長辺部２７と、長辺部２７の両端部から輸液チューブ２の径方向に延びる短辺部２８ａ〜２８ｄとを備え、角Ｃ字状に形成されたスリット２４ａ、２４ｂが一対並列されてなり、スリット２４ａの短辺部２８ａ、２８ｂの先端側がスリット２４ｂ側に向けられ、スリット２４ｂの短辺部２８ｃ、２８ｄの先端側がスリット２４ａ側に向けられている。 The slits 24 a and 24 b provided in the pressure receiving plate 15 of the second embodiment are a long side portion 27 provided along the infusion direction of the infusion tube 2, and a radial direction of the infusion tube 2 from both ends of the long side portion 27. A pair of slits 24a, 24b formed in a square C shape, and the tip sides of the short sides 28a, 28b of the slit 24a are directed toward the slit 24b. The leading ends of the short sides 28c and 28d of the slit 24b are directed toward the slit 24a.

短辺部２８ａ、２８ｄは同じ長さであり、短辺部２８ｂ、２８ｃは同じ長さとなる。また、短辺部２８ａ、２８ｄは、短辺部２８ｂ、２８ｃよりも長くなるように形成されている。スリット２４ａ、２４ｂは輸液チューブ２の輸液方向にオフセットされており、短辺部２８ａ、２８ｃの間と、短辺部２８ｂ、２８ｄの間とに連結部２９が形成されている。なお、他の構成については、第１の実施形態と同様であるので、同一の符号を付して説明を省略する。 The short side portions 28a and 28d have the same length, and the short side portions 28b and 28c have the same length. The short sides 28a and 28d are formed to be longer than the short sides 28b and 28c. The slits 24a and 24b are offset in the infusion direction of the infusion tube 2, and a connecting portion 29 is formed between the short side portions 28a and 28c and between the short side portions 28b and 28d. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

第２の実施形態によれば、連結部２９は、互いに向かい合う一方のスリット単体２４ａの短辺部２８ａ、２８ｂと他方のスリット単体２４ｂの短辺部２８ｃ、２８ｄとの間に形成されているため、例えばエッチングによるスリット２４の形成時において、受圧部２６が外周部４０から分離することを防止することができる。従って、受圧部２６を容易に製造することができる。 According to the second embodiment, the connecting portion 29 is formed between the short side portions 28a and 28b of one slit single piece 24a facing each other and the short side portions 28c and 28d of the other single slit piece 24b. For example, when the slit 24 is formed by etching, the pressure receiving portion 26 can be prevented from being separated from the outer peripheral portion 40. Therefore, the pressure receiving portion 26 can be easily manufactured.

［第３の実施形態］
次に、図８を参照して、本発明の第３の実施形態について説明する。 [Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.

第３の実施形態では、受圧板１５は、押圧されて長円形状に変形した輸液チューブ２の外周面２ａが当接される受圧部２６を中央に有し、フォースセンサ１０と受圧板１５の裏面との当接部が受圧板１５の中心となるように構成されている。即ち、第３の実施形態では、スリット２４は受圧板１５に設けられていない。また、第３の実施形態では、外周部４０及び受圧部２６の表面に膜部材３０は貼り付けられていない。そのため、輸液チューブ２の内圧の増加によって受圧板１５が弾性変形し、当該変形によって生じる荷重がフォースセンサ１０によって検出される。また、受圧板１５の材質としては、例えばステンレス鋼や合成樹脂のような非腐食性の材質が望ましい。 In the third embodiment, the pressure receiving plate 15 has a pressure receiving portion 26 in contact with the outer peripheral surface 2a of the infusion tube 2 that has been pressed and deformed into an oval shape, and the force sensor 10 and the pressure receiving plate 15 are in contact with each other. The contact portion with the back surface is configured to be the center of the pressure receiving plate 15. That is, in the third embodiment, the slit 24 is not provided in the pressure receiving plate 15. In the third embodiment, the membrane member 30 is not attached to the surfaces of the outer peripheral portion 40 and the pressure receiving portion 26. Therefore, the pressure receiving plate 15 is elastically deformed by an increase in the internal pressure of the infusion tube 2, and a load generated by the deformation is detected by the force sensor 10. Further, as the material of the pressure receiving plate 15, for example, a non-corrosive material such as stainless steel or synthetic resin is desirable.

なお、他の構成については、第１の実施形態と同様であるので、同一の符号を付して説明を省略する。 Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

第３の実施形態によれば、フォースセンサ１０と受圧部２６の裏面との当接部が受圧板１５の中心であるため、受圧部２６の中心が受圧板１５の撓みの中心となる。そのため、受圧部２６が受圧板１５に対して実質的に平行移動をしない状態でも、受圧部２６がフォースセンサ１０に対して垂直に当接する。従って、受圧板１５に対して実質的に平行移動をしない受圧部２６を有する圧力検出装置において、輸液チューブ２の内圧を効率よく受圧部２６に伝達させることができ、フォースセンサ１０で検出される荷重の精度が向上する。 According to the third embodiment, since the contact portion between the force sensor 10 and the back surface of the pressure receiving portion 26 is the center of the pressure receiving plate 15, the center of the pressure receiving portion 26 is the center of bending of the pressure receiving plate 15. Therefore, even when the pressure receiving portion 26 does not substantially translate with respect to the pressure receiving plate 15, the pressure receiving portion 26 contacts the force sensor 10 vertically. Therefore, in the pressure detection device having the pressure receiving portion 26 that does not substantially translate with respect to the pressure receiving plate 15, the internal pressure of the infusion tube 2 can be efficiently transmitted to the pressure receiving portion 26 and detected by the force sensor 10. Load accuracy is improved.

なお、本発明は、上記の実施形態に限定されない。例えば、ケース９と受圧板１５とは一体形成されていてもよい。ケース９と受圧板１５とを一体形成とすることにより、ケース９と受圧板１５との間には隙間が生じないため、中空部１８に収納されている基板１１、１２、フォースセンサ１０に対する防水、防滴機能を得ることができる。 In addition, this invention is not limited to said embodiment. For example, the case 9 and the pressure receiving plate 15 may be integrally formed. Since the case 9 and the pressure receiving plate 15 are integrally formed, there is no gap between the case 9 and the pressure receiving plate 15, so that the substrates 11 and 12 and the force sensor 10 housed in the hollow portion 18 are waterproofed. The drip-proof function can be obtained.

２…輸液チューブ、６…圧力検出装置、９…ケース、１０…圧力センサ、１５…受圧板、２４…スリット、２６…受圧部、２９、４１…連結部、３０…膜部材。 DESCRIPTION OF SYMBOLS 2 ... Infusion tube, 6 ... Pressure detection apparatus, 9 ... Case, 10 ... Pressure sensor, 15 ... Pressure receiving plate, 24 ... Slit, 26 ... Pressure receiving part, 29, 41 ... Connection part, 30 ... Membrane member.

Claims

A pressure receiving plate with which an infusion tube is brought into contact with the surface;
A force sensor that detects a load by contacting the back surface of the pressure plate;
The pressure receiving plate and a case for storing the force sensor,
A pressure detection device for detecting an internal pressure of the infusion tube,
The pressure receiving plate includes a pressure receiving portion outer peripheral surface of the front Symbol infusion tube is abutting, the slit surrounding the pressure receiving portion, and an outer peripheral portion provided on the outer peripheral side of the slit, the said outer peripheral portion pressure and a connecting portion for connecting the parts,
The pressure receiving portion, the outer peripheral portion, and the connecting portion are integrally formed as a plate member,
Depending on the pressure receiving portion in the infusion tube which is deformed by a change in internal pressure is pressed, the pressure receiving portion with the connection portion is elastically deformed to move the force sensor side with respect to the outer peripheral portion, the pressure A load is detected by the force sensor in contact with a portion.

A pressure receiving plate with which an infusion tube is brought into contact with the surface;
A force sensor that detects a load by contacting the back surface of the pressure plate;
The pressure receiving plate and a case for storing the force sensor,
A pressure detection device for detecting an internal pressure of the infusion tube,
The pressure receiving plate includes a pressure receiving portion with which an outer peripheral surface of the infusion tube abuts, a C-shaped slit surrounding the pressure receiving portion, an outer peripheral portion provided on an outer peripheral side of the slit, and the outer peripheral portion. And a connecting portion that connects the pressure receiving portion ,
The pressure receiving portion, the outer peripheral portion, and the connecting portion are integrally formed as a plate member,
When the pressure receiving portion is pressed against the infusion tube deformed by a change in internal pressure, the connecting portion is elastically deformed, and the pressure receiving portion moves toward the force sensor with respect to the outer peripheral portion. those by contact to said force sensor you, characterized in that the load is detected pressure detecting device.

A pressure receiving plate with which an infusion tube is brought into contact with the surface;
A force sensor that detects a load by contacting the back surface of the pressure plate;
The pressure receiving plate and a case for storing the force sensor,
A pressure detection device for detecting an internal pressure of the infusion tube,
The pressure receiving plate includes a pressure receiving portion with which the outer peripheral surface of the infusion tube pressed and deformed into an oval shape is in contact, a slit surrounding the periphery of the pressure receiving portion, and an outer peripheral portion provided on the outer peripheral side of the slit And a connecting portion that connects the outer peripheral portion and the pressure receiving portion,
Due to the change in the internal pressure of the infusion tube, the connecting portion is elastically deformed and the pressure receiving portion moves substantially parallel to the outer peripheral portion, and the load is detected by the force sensor that contacts the pressure receiving portion,
The slit is formed in a corner C shape having a long side provided along the infusion direction of the infusion tube and a short side extending from both ends of the long side in the radial direction of the infusion tube. A pair of slits are arranged in parallel,
The slit single body, the short side of each other is directed to the other slit single side, and is offset in the infusion direction of the tube,
The coupling portion pressure detecting device you being formed between the short side portion and the other short side of the slit a single one slit alone to face each other.

The pressure detecting device according to claim 3 , wherein the connecting portion is formed of a flexible film member that is provided on a front surface or a back surface of the pressure receiving plate and covers the slit.

The pressure detection device according to any one of claims 1 to 4, wherein the case and the pressure receiving plate are integrally formed.

The case has a width larger than the diameter of the infusion tube and a depth smaller than the diameter of the infusion tube, and a storage recess having the pressure receiving plate as a bottom surface is formed,
The pressure detection device according to claim 1, wherein the infusion tube is inserted into the storage recess.