公开(公告)号：US12004753B2

公开(公告)日：2024-06-11

申请号：US17492076

申请日：2021-10-01

申请人： Martiurion Electronics Limited ,  James S. Stewart ,  Christopher Green ,  Ashish Shah

发明人： Andrew Barr ,  James S. Stewart ,  Christopher Green ,  Ashish Shah

IPC分类号： A61B17/135 ,  A61B5/022 ,  A61B17/00 ,  A61B17/132 ,  A61B90/00

CPC分类号： A61B17/1355 ,  A61B5/022 ,  A61B5/02233 ,  A61B2017/00022 ,  A61B17/132 ,  A61B17/135 ,  A61B2090/063 ,  A61B2562/0261

摘要： A tourniquet for occluding blood flow to a limb is improved by the addition of proximal and distal strain gauges. The proximal strain gauge may be monitored under conditions of total blood flow occlusion for time-varying signals indicative of volumetric limb changes arising from the subject's blood flow in the proximal section of the limb. Upon a change in limb occlusion pressure, the signals from the proximal strain gauge can be observed to change also, and the working pressure in the tourniquet can be adjusted safely in response. Automated control systems may further use inputs from a distal strain gauge and/or from a sensor that detects induced pressure changes within the tourniquet to improve the control of the tourniquet working pressure during operation to avoid unwanted blood flow past the tourniquet.

公开(公告)号：US20240299039A1

公开(公告)日：2024-09-12

申请号：US18670425

申请日：2024-05-21

申请人： James S. Stewart ,  Christopher Green ,  Ashish Shah ,  Marturion Electronics Limited

发明人： Andrew Barr ,  James S. Stewart ,  Christopher Green ,  Ashish Shah

IPC分类号： A61B17/135 ,  A61B5/022 ,  A61B17/00 ,  A61B17/132 ,  A61B90/00

CPC分类号： A61B17/1355 ,  A61B5/022 ,  A61B5/02233 ,  A61B2017/00022 ,  A61B17/132 ,  A61B17/135 ,  A61B2090/063 ,  A61B2562/0261

摘要： A tourniquet for occluding blood flow to a limb is improved by the addition of proximal and distal strain gauges. The proximal strain gauge may be monitored under conditions of total blood flow occlusion for time-varying signals indicative of volumetric limb changes arising from the subject's blood flow in the proximal section of the limb. Upon a change in limb occlusion pressure, the signals from the proximal strain gauge can be observed to change also, and the working pressure in the tourniquet can be adjusted safely in response. Automated control systems may further use inputs from a distal strain gauge and/or from a sensor that detects induced pressure changes within the tourniquet to improve the control of the tourniquet working pressure during operation to avoid unwanted blood flow past the tourniquet.

公开(公告)号：US20210259704A1

公开(公告)日：2021-08-26

申请号：US17032130

申请日：2020-09-25

申请人： James S. Stewart ,  Christopher Green ,  Ashish Shah ,  Marturion Electronics Limited

发明人： Andrew Barr ,  James S. Stewart ,  Christopher Green ,  Ashish Shah

IPC分类号： A61B17/135

摘要： A method and system for controlling a tourniquet establishes a set of values for a characteristic of an induced pressure pulse in the tourniquet while the tourniquet is inflated to a working pressure which is at a predetermined offset above the limb occlusion pressure. Maximum and minimum thresholds for this characteristic value are established, such that during the working phase of application of the tourniquet the induced pressure pulse is continually monitored and the value of the characteristic is compared to the thresholds. If a threshold is reached the tourniquet is inflated or deflated accordingly to restore the value of the characteristic to within the thresholds. The characteristic of the induced pressure pulse, which may be e.g. pulse height, area under pulse or pulse width at a percentage of peak height, may also be used to determine behaviour of the pressure pulse by noting a variation in the rate of change as the tourniquet is inflated past the limb occlusion pressure.