公开(公告)号：WO1993004284A1

公开(公告)日：1993-03-04

申请号：PCT/US1992006586

申请日：1992-08-05

Applicant: ABBOTT LABORATORIES

Inventor： ABBOTT LABORATORIES ,  NATWICK, Vernon, R. ,  LAWLESS, Michael, W. ,  DOLL, Joseph, E. ,  WU, Chung-You, Charles

IPC: F04B43/12

CPC classification number: F04B43/084 ,  A61M5/14228 ,  A61M5/16854 ,  A61M2205/14 ,  F04B43/082 ,  F04B43/123 ,  F04B49/065

Abstract: A volumetric pump (30) includes a motor (146) that rotatably drives a cam assembly (142), which actuates a plunger (48), causing it to compress a pumping portion (34b) of a flexible tubing (34). Compression of the tubing displaces fluid trapped within the pumping portion, causing it to flow past an outlet cracking valve (52). A proximal pressure sensor (44) and a distal pressure sensor (56) each produce signals indicative of the pressure within the proximal portion and distal portion of the flexible tubing, which are used to determine whether a proximal or distal occlusion of the flexible tubing has occurred. Both pressure sensors comprise strain gauges connected to flexures that apply a spring-biased force against the proximal and distal portions of the flexible tubing. These sensors thereby respond to the cross-sectional size (diameter) of the tubing, as affected by fluid pressure therein. Proximal and distal pressures are thus monitored without violating the integrity of the flexible tubing.

Abstract translation: 容积泵（30）包括可旋转地驱动凸轮组件（142）的马达（146），其驱动柱塞（48），使其压缩柔性管道（34）的泵送部分（34b）。 管道的压缩将捕获在泵送部分内的流体置换，使其流过出口裂解阀（52）。 近端压力传感器（44）和远端压力传感器（56）各自产生指示柔性管的近端部分和远端部分内的压力的信号，其用于确定柔性管的近端或远端闭塞是否具有 发生。 两个压力传感器都包括连接到挠性件的应变计，该挠曲件对柔性管的近端部分和远端部分施加弹簧偏压力。 这些传感器因此受到其中流体压力的影响而对管道的横截面尺寸（直径）作出响应。 因此监测近端和远端压力，而不会违反柔性管的完整性。

公开(公告)号：WO1993004285A1

公开(公告)日：1993-03-04

申请号：PCT/US1992006585

申请日：1992-08-05

Applicant: ABBOTT LABORATORIES

Inventor： ABBOTT LABORATORIES ,  NATWICK, Vernon, R. ,  LAWLESS, Michael, W. ,  DOLL, Joseph, E. ,  WU, Chung-You, Charles

IPC: F04B49/06

CPC classification number: A61M5/14228 ,  A61M5/142 ,  A61M5/16854 ,  A61M39/281 ,  F04B43/082 ,  F04B49/065 ,  G06F19/00 ,  Y02A90/26

Abstract: A method for determining if fluid is being displaced by a volumetric pump. During a pumping segment of a pumping cycle for the volumetric pump, an outlet cracking valve (52) compresses the flexible tubing until the pressure of the fluid displaced by the plunger exceeds a cracking pressure, at which time the outlet cracking valve opens to enable fluid flow. A cracking flexure (182) provides the cracking force. A flow detector (54) mounted to the cracking flexure responds to the stress generated in the cracking flexure thereby, producing a signal indicative of fluid flow from the volumetric pump. The flow detector also provides an indication when a source of liquid (31) for the volumetric pump has run dry. The method comprises the steps of processing the signal to determine if it exceeds a predefined threshold that varies as a function of the rate at which the pump is set to deliver fluid.

Abstract translation: 用于确定流体是否被体积泵移位的方法。 在用于体积泵的泵送循环的泵送段期间，出口裂解阀（52）压缩柔性管，直到由柱塞移位的流体的压力超过开启压力，此时出口裂化阀打开以使流体 流。 裂纹弯曲（182）提供了开裂力。 安装到裂缝弯曲部上的流量检测器（54）响应于裂缝挠曲中产生的应力，从而产生指示来自容积泵的流体流动的信号。 当体积泵的液体源（31）运行干燥时，流量检测器还提供指示。 该方法包括以下步骤：处理信号以确定其是否超过根据泵被设置为输送流体的速率的函数而变化的预定阈值。