公开(公告)号：US4401116A

公开(公告)日：1983-08-30

申请号：US212893

申请日：1980-12-04

Applicant: Stanley E. Fry ,  Claude C. Hurd

Inventor： Stanley E. Fry ,  Claude C. Hurd

IPC: A61M16/00

CPC classification number: A61M16/00

Abstract: A gas flow rate control device for a medical ventilator includes a variable-orifice valve for adjustment of the peak flow rate, and a waveform regulator which supplies controlled gas pressure to the orifice. The regulator maintains a fixed pressure differential between the upstream side of the orifice and a reference pressure. The reference pressure is variable between atmospheric pressure and a pressure which is essentially patient airway proximal pressure. When the reference pressure is patient airway proximal pressure, a constant pressure differential is maintained across the orifice so that a uniform flow rate is maintained. When the reference pressure is atmospheric pressure, a constant pressure is supplied to the upstream side of the orifice, so that the flow rate from the orifice decreases as patient airway proximal pressure on the downstream side of the orifice increases. In one embodiment, the invention uses a pneumatic switch to supply, as the reference pressure, either airway proximal pressure, whereby a uniform flow rate or "square wave" is obtained, or atmospheric pressure, whereby a fixed flow rate deceleration or "taper wave" is obtained for any given peak flow rate setting of the variable orifice. In another embodiment, a valve is used to vary the reference pressure between atmospheric pressure and airway proximal pressure to obtain adjustable values of flow rate deceleration for any given setting of the peak flow orifice.

Abstract translation: 用于医疗呼吸机的气体流量控制装置包括用于调节峰值流量的可变孔口阀以及向孔口提供受控气体压力的波形调节器。 调节器在孔口的上游侧和参考压力之间保持固定的压力差。 参考压力在大气压力和基本上是患者气道近端压力的压力之间是可变的。 当参考压力是患者气道近端压力时，在整个孔口上保持恒定的压差，从而保持均匀的流速。 当基准压力为大气压时，向孔口的上游侧供给恒定的压力，使得当孔口下游侧的患者气道近侧压力增加时，来自孔口的流量减小。 在一个实施例中，本发明使用气动开关作为基准压力提供气道近端压力，由此获得均匀的流速或“方波”或大气压，由此固定的流量减速度或“锥度波 “可变孔口的任何给定峰值流量设置获得。 在另一个实施例中，阀用于改变大气压和气道近端压力之间的参考压力，以获得针对峰值流量孔口的任何给定设置的流量减速度的可调节值。

公开(公告)号：US4367767A

公开(公告)日：1983-01-11

申请号：US212889

申请日：1980-12-04

Applicant: Claude C. Hurd

Inventor： Claude C. Hurd

IPC: A61M16/20 ,  F16K17/10

CPC classification number: A61M16/20 ,  A61M16/207 ,  Y10T137/7764 ,  Y10T137/777

Abstract: A servo-type gas pressure relief valve for regulating air pump pressure to pneumatic components of a medical ventilator or similar equipment utilizes a small diaphragm-type bleed or pilot valve to control the action of a main diaphragm valve. A small amount of inlet gas from the bottom side of the large diaphragm is passed through a restricted orifice to the top side of the large diaphragm. The bleed valve bleeds this gas to the atmosphere at a selected pressure, said bleeding action creating a pressure differential across the diaphragm of the main valve, which is thereby opened to exhaust gas to the atmosphere. A screw adjustment exerts tension on a spring which, in turn, exerts a force on the upper part of the bleed valve diaphragm. By adjusting the tension on the spring, the pressure at which air is bled to the atmosphere can be controlled, thereby accurately controlling the pressure at which the main valve opens.

Abstract translation: 用于将气泵压力调节到医用呼吸机或类似设备的气动部件的伺服型气体压力释放阀利用小的隔膜式泄放或先导阀来控制主隔膜阀的作用。 来自大隔膜的底侧的少量入口气体通过限制孔口流过大隔膜的顶侧。 泄放阀以选定的压力将这种气体排放到大气中，所述渗流作用产生跨越主阀的隔膜的压差，由此打开以将废气排放到大气中。 螺钉调整在弹簧上施加张力，弹簧又在排气阀隔膜的上部施加力。 通过调节弹簧的张力，可以控制空气流向大气的压力，从而精确地控制主阀打开的压力。

公开(公告)号：US4072148A

公开(公告)日：1978-02-07

申请号：US756448

申请日：1977-01-03

Applicant: Ramon J. Munson ,  Claude C. Hurd ,  James Weigl

Inventor： Ramon J. Munson ,  Claude C. Hurd ,  James Weigl

IPC: A61M16/12 ,  A61M16/00

CPC classification number: A61M16/12 ,  Y10T137/87281 ,  Y10T137/8741 ,  Y10T137/87692

Abstract: A valve assembly for mixing air and oxygen in a medical respirator over a wide range of volumetric flow rates, without sacrificing relative mixing accuracy at the lower flow rates. The assembly is divided into a plurality of mixing valve modules characterized respectively by progressively increasing volumetric flow capacities and progressively decreasing absolute mixing accuracies. The higher flow capacity modules are sequentially brought into operation as the overall valve flow increases and then interrupted when the flow decreases below a threshold level associated with each module. The valve assembly accordingly has a large range of flow capacities without degrading absolute mixing accuracy during low flow rate conditions by the effect of the higher capacity modules.

Abstract translation: 一种阀组件，用于在宽范围的体积流速下在医用呼吸器中混合空气和氧气，而不会在较低的流速下牺牲相对的混合精度。 该组件分为多个混合阀模块，分别具有逐渐增加的容积流量和逐渐降低绝对混合精度的特征。 当流量降低到与每个模块相关联的阈值水平以下时，随着整个阀门流量的增加，较高的流量模块被顺序地运行。 因此，阀组件具有大范围的流动能力，而在低流量条件下，通过较高容量模块的作用，不会降低绝对混合精度。