Patent Grant
12048831
This disclosure relates to detection systems and methods for detecting air or occlusions in an infusion system.
Existing strategies for detecting air in the line of an infusion device often involve the use of ultrasonic sensors that are physically located on opposite sides of a tubing segment. When fluid is present in the tube, propagation of the acoustic signal is efficient and produces a large electrical signal via the receiver circuit. On the other hand, the presence of air in the tube causes an acoustical open circuit which substantially attenuates the detected signal. In current practice, detection of air in the tubing segment is performed on the basis of a simple (static) air-fluid boundary or threshold that is applied to the sensor voltage signal. When the air sensor signal moves beyond the pre-defined air/fluid threshold, an alarm condition occurs and the IV infusion is paused.
Additionally, in current practice, there exist methods/algorithms that utilize the plunger force sensor readings to detect the presence of air in the plunger chamber. Several Hospira™ pumps involve the use of a cassette with a chamber that is compressed by an actuated plunger to pump fluid at a controlled rate from the drug container to the patient. The measured force during a pumping cycle is directly related to the type of fluid in the chamber. For instance, fluids are relatively incompressible and generate a higher and different force profile than air. Similarly, a combination of fluid and air in the chamber results in a hybrid force profile that is indicative of the mixture percentages.
Both methods described above rely on observations from a single sensor (i.e., air sensor or force sensor). Faulty sensor observations are the major drawback of such single-sensor based systems/algorithms. For instance, for air sensor based algorithms, a variety of situations (e.g., dancing micro air bubbles, stuck fluid droplet at the end-of-bag, etc.) exist which generate false alarms or mask the presence of air in front of the air-sensor leading to false negatives. Similarly, force sensor based algorithms can be fooled by variable distal/proximal pressure during delivery (e.g., kinked tubing due to patient movement). The measured force during a pumping cycle is affected by the pressure applied to both distal and proximal sides of the tubing. For instance, drop in a distal pressure will cause drop in the plunger force readings, which will be perceived as a transition from fluid to air in the chamber by the existing force algorithms and cause a false positive detection of air. Single-sensor based air-in-line detection systems ma y fail to detect an end-of-bag situation that can result in air in the line, or may incorrectly determine that the fluid in the line is air (i.e., causing nuisance alarms).
A system and method is needed to overcome one or more issues of one or more of the existing infusion systems or methods.
In one embodiment, an infusion system is disclosed for being operatively connected to a fluid delivery line and to an infusion container containing an infusion fluid. The infusion system includes a pump, a plurality of different types of sensors connected to the pump or the fluid delivery line, at least one processor, and a memory. The plurality of different types of sensors are configured to indicate whether air is in the fluid delivery line. The at least one processor is in electronic communication with the pump and the plurality of different types of sensors. The memory is in electronic communication with the at least one processor. The memory includes programming code for execution by the at least one processor. The programming code is configured to, based on measurements taken by the plurality of different types of sensors, determine the following: (1) whether there is air in the fluid delivery line; (2) whether there is a partial occlusion or a total occlusion in the fluid delivery line; or (3) a percentage of the air present in the fluid delivery line or the probability of the air being in the fluid delivery line.
In another embodiment, a method for infusing an infusion fluid is disclosed. In one step, infusion fluid is pumped through a fluid delivery line of an infusion system. In another step, measurements are taken with a plurality of different types of sensors connected to the infusion system. In an additional step, at least one processor determines, based on the measurements taken by the plurality of the different types of the sensors, the following: (1) whether there is air in the fluid delivery line; (2) whether there is a partial occlusion or a total occlusion in the fluid delivery line; or (3) a percentage of the air present in the fluid delivery line or the probability of the air being in the fluid delivery line.
The scope of the present disclosure is defined solely by the appended claims and is not affected by the statements within this summary.
The disclosure can be better understood with reference to the following drawings and description. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the disclosure.
The following detailed description is of the best currently contemplated modes of carrying out the disclosure. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the disclosure, since the scope of the disclosure is best defined by the appended claims. It is noted that the Figures are purely for illustrative purposes and are not to scale.
In this disclosure, multi-sensor algorithms that utilize signals from at least two different sensors, such as air, force, and pressure sensors, are utilized. Further, methods are disclosed of combining and qualifying the signals from multi-sensors to improve the robustness and reliability (i.e., true negative and false positive performance) of air detection systems.
The disclosure is a software based solution for detecting the presence of air within a fluid delivery line. The target application is an air-in-line and end-of-bag detection system for IV medication infusion pumps (e.g., Symbiq™, Gemstar™, or Plum™).
In the disclosure signals from multiple-sensors (i.e., acoustic air sensor, force sensor, distal and proximal pressure sensors) are integrated in order to improve the robustness, and the true negative and false positive performance of IV infusion air-in-line detection systems. Disclosed herein are methods of combining and qualifying the signals from multi-sensors to improve the reliability of air detection systems.
In an alternate embodiment, the disclosure can be used to fully characterize the type of fluid-air mixture present in the infusion line by using multiple-sensor signals to determine the percent of air present or the probability of the presence of air. In another alternate embodiment, the disclosure can be used to improve the robustness and reliability of occlusion detection systems by combining and qualifying the signals from multi-sensors.
The following is a summary of some distinguishing elements of this disclosure. An event detection and qualifier algorithm is disclosed which determines the presence of air in the line during delivery on the basis of air sensor and plunger force sensor observations. An event detection and qualifier algorithm is disclosed that determines the presence of air in the line during delivery on the basis of air sensor, plunger force sensor, and distal and proximal pressure sensor observations. An event detection and qualifier algorithm is disclosed that determines the presence of a partial or total distal/proximal occlusion in the fluid delivery line on the basis of plunger force and pressure sensor signals. A multivariate pattern recognition system is disclosed which determines the percent of air present or the probability of the presence of air in the line.
One problem addressed in this disclosure is to integrate signals from multi-sensors in order to improve the robustness, and the true negative and false positive performance of IV infusion air-in-line detection systems. Disclosed herein are methods of combining and qualifying the signals from multi-sensors to improve the reliability of air detection systems.
Another problem addressed in this disclosure is to fully characterize the type of fluid/air mixture present in the infusion line. Disclosed herein are methods that integrate signals from multi-sensors in order to determine t h e probability or the percent of air present in the line.
Still another problem addressed in this disclosure is the detection of partial and total distal/proximal occlusion in the fluid delivery line. Disclosed herein are methods of combining and qualifying the signals from multi-sensors to improve the robustness and reliability of occlusion detection systems. In current practice, distal/proximal occlusion algorithms are typically based on pressure readings only.
The disclosure improves the air detection capability of existing infusion pump systems that rely on sensors to make a real-time assessment. In doing so, the disclosed methods do not require additional hardware modifications but instead leverage the acquired multi-sensor signals. Additionally, the disclosure does not necessarily replace existing software modules for air detection but adds an additional safety layer.
The disclosure provides a method for improving the robustness of air detection systems by reducing the likelihood of a false positive air detection. This reduces the chances of an interruption of therapy due to a false alarm. The disclosure further provides a means to improve the sensitivity and specificity of air detection by fusing data collected by multiple sensors.
In current practice, air-in-line algorithms are typically based on air sensor signals only and are used to signify the presence of a single bubble, froth, stuck droplet, or cumulative air in the fluid delivery line. Similarly, plunger force algorithms that are based on plunger force signal only, are typically used to signify the presence of air in the plunger chamber. In this disclosure, plunger force algorithms are integrated with air-in-line algorithms to provide a more robust air-in-line detection system with improved true negative and false positive performance.
There is a delay between force and air sensor readings due to the physical location of the two sensors. For instance, for a Symbiq™ pump, the force sensor is located on the plunger and the air sensor is located distal to the plunger, and the fluid volume between the two sensors is approximately 150 uL (or 2 full plunger strokes). The integrated system disclosed herein utilizes both force and air sensor signals to account for such delays.
The infusion container 102 comprises a container for delivering an infusion fluid such as IV fluid or a drug to a patient 118. The fluid delivery line 104 comprises one or more tubes, connected between the infusion container 102, the pump device 106, the plurality of different types of sensors 114, and the delivery/extraction device 116, for transporting infusion fluid from the infusion container 102, through the pump device 106, through the plurality of different types of sensors 114, through the delivery/extraction device 116 to the patient 118. The fluid delivery line 104 may also be used to transport blood, delivered to or extracted from the patient 118 using the delivery/extraction device 116, through the plurality of different types of sensors 114 as a result of a pumping action of the pump device 106. The pump device 106 comprises a pump for pumping infusion fluid from the infusion container 102 or for pumping blood to or from the patient 118. The pump device 106 may comprise a plunger based pump, a peristaltic pump, or another type of pump.
The processing device 108 comprises at least one processor for processing information received from the plurality of different types of sensors 114 and for executing one or more algorithms to determine: (1) whether there is air in the fluid delivery line 104; (2) whether there is a partial or total occlusion in the fluid delivery line 104; (3) or a percentage of air present in the fluid delivery line 104 or the probability of the air being in the fluid delivery line 104. The processing device 108 includes or is in electronic communication with a computer readable memory, containing programming code containing the one or more algorithms for execution by the processor, and a clock. The alarm device 110 comprises an alarm, triggered by the processing device 108, for notifying the clinician (also referred to as ‘user’ herein) of: (1) whether there is air in the fluid delivery line 104; (2) whether there is a partial or total occlusion in the fluid delivery line 104; (3) or a percentage of air present in the fluid delivery line 104 or the probability of the air being in the fluid delivery line 104. The alarm device 110 may be configured to stop the pump device 106 prior to a significant amount of air being delivered through the fluid delivery line 104 and the delivery/extraction device 116 to the patient 118.
The input/output device 112 comprises a device which allows a clinician to input or receive information. The input/output device 112 allows a clinician to input information such as: medication information regarding the infusion fluid being delivered from the infusion container 102; infusion information regarding the infusion of the infusion fluid being delivered from the infusion container 102; distance information regarding the distance(s) between the plurality of different type of sensors; delay information regarding the delay(s) in measurements between the plurality of different types of sensors 114; the selection of settings for the processing device 108 to apply in using the programming code containing the algorithm(s); or other information that is pertinent to the infusion. The medication information regarding the infusion fluid delivered from the infusion container 102 may comprise a formulation of the infusion fluid, a rate of the infusion fluid, a duration of the infusion fluid, a viscosity of the infusion fluid, a therapy of the infusion fluid, or a property of the infusion fluid. The infusion information regarding the infusion fluid delivered from the infusion container 102 may comprise a volume of the infusion fluid in the infusion container or another parameter regarding the infusion of the infusion fluid. The input/output device 112 may allow a clinician to select and/or confirm a user-inputted medication infusion program to be applied by the processing device 108. The input/output device 112 may further output information to the clinician. In other embodiments, any of the information inputted into the input/output device 112 may be pre-installed into the programming code or the processing device 108.
The plurality of different types of sensors 114 may comprise any number, combination, or configuration of pressure sensors, force sensors, air sensors, or other type of sensors. The pressure sensors may comprise one or more proximal or distal pressure sensors for detecting the amount of pressure in the fluid delivery line 104 proximal or distal to the pump device 106. The amount of pressure detected by the one or more pressure sensors is indicative of whether air, fluid, or some combination thereof is present in the fluid delivery line 104. For instance, U.S. Pat. No. 8,403,908 to Jacobson et al., which is commonly owned and hereby incorporated by reference, discloses the use of pressure sensors to determine whether air, fluid, or some combination thereof is present in the fluid delivery line 104. The one or more force sensors may comprise one or more force sensors for detecting the amount of force on a plunger of the pump device 106. The amount of force detected by the one or more force sensors is indicative of whether air, fluid, or some combination thereof is present in the fluid delivery line 104. For instance, U.S. Ser. No. 13/851,207 filed 27 Mar. 2013, which is commonly owned and hereby incorporated by reference, discloses the use of force sensors to determine whether air, fluid, or some combination thereof is present in the fluid delivery line 104. The one or more air sensors may comprise one or more air sensors for detecting whether air, fluid, or a combination thereof is present in the fluid delivery line 104. The strength of the signal that propagates from the one or more air sensors through the fluid delivery line 104 is indicative of whether air, fluid, or some combination thereof is present in the fluid delivery line 104. For instance, U.S. Pat. No. 7,981,082 to Wang et al., which is commonly owned and hereby incorporated by reference, discloses the use of air sensors to determine whether air, fluid, or some combination thereof is present in the fluid delivery line 104. In other embodiments, any number, types, combinations, or configurations of sensors 114 may be used to determine whether air, fluid, or some combination thereof is present in the fluid delivery line 104.
The delivery/extraction device 116 comprises a patient vascular access point device for delivering infusion fluid from the infusion container 102 to the patient 118, or for extracting blood from the patient 118. The delivery/extraction device 116 may comprise a needle, a catheter, a cannula, or another type of delivery/extraction device. In other embodiments, the infusion system 100 of
In step 168, the method starts. The method proceeds from step 168 to step 170. In step 170, the variables are set including setting sampling step i=0, setting the number Nw of pumping strokes of delay between a plunger force sensor and an air-in-line sensor, setting the air-in-line sensitivity AILSens of the air-in-line sensor to an initial setting, setting the air-in-line sensitivity increment SensIncr of the air-in-line sensor to an initial setting, and setting the percent confidence threshold Conf_Thr to an initial setting. It is noted that throughout this disclosure that sampling step i represents one stroke of the pump of the infusion system. The method proceeds from step 170 through location step 172 to step 174. In step 174, sampling step i is reset to i=i+1. The method proceeds from step 174 to step 176.
In step 176, a plunger force algorithm is used to determine at sampling step i whether air is detected in a pumping chamber based on measurements of a plunger force sensor. The method proceeds from step 176 to step 178. In step 178, if air is detected in step 176 then an air indicator AirIndicator(i) is set to 1 and if air is not detected in step 176 then the air indicator AirIndicator(i) is set to 0. The method proceeds from step 178 to step 180. In step 180, a Buffer is saved as [AirIndicator(i) . . . AirIndicator(i−Nw)] saving the 1 or 0 setting made in step 178. For instance, if it takes 2 pumping strokes of the pump for the infusion fluid to travel from the plunger force sensor to the air-in-line sensor, then Nw is set to 2 to accommodate for this delay and the Buffer saves the AirIndicator(i) for the current sample i, the AirIndicator(i−1) for the previous sample i−1, and the AirIndicator(i−2) for two samples before. In step 182, a confidence indicator ConfIndicator(i) is set for the current sample i as to the percent confidence in the presence of air being present in the pumping chamber. The method proceeds from step 182 through location step 184 to step 190.
While the method proceeds from step 174 to 176, the method also simultaneously proceeds from step 174 to step 186. In step 186, an air-in-line algorithm is used to determine at sampling step i whether air is detected in a fluid-delivery-line of the infusion system based on measurements from the air-in-line sensor. The method proceeds from step 186 to step 188. In step 188, if air is detected in step 186 then an air-in-line AILIndicator(i) is set to 1 and if air is not detected in step 186 then the air-in-line AILIndicator(i) is set to 0. The method proceeds from step 188 through location step 184 to step 190.
In step 190, a determination is made as to whether the air-in-line indicator AILIndicator(i) equals 1. If a determination is made that the air-in-line indicator AILIndicator(i) does equal 1, then the method proceeds from step 190 to step 192. In step 192, if any of the buffer saved in step 180 is set to 1 (i.e. if any of AirIndicator(i) . . . AirIndicator(i−Nw) is set to 1), then the method proceeds from step 192 to step 194 and turns on the alarm indicating that air is disposed in the infusion system since both the air-in-line indicator (AILIndicator) and the plunger force indicator (AirIndicator) indicated that air was in the infusion system (i.e. AILIndicator(i)=1 and one or more of the entries saved in the AirIndicator buffer=1). When the alarm is turned on in step 194, the infusion system is turned off automatically or manually by the clinician to stop the infusion of the infusion fluid.
In step 192, if any of the buffer saved in step 180 is not set to 1 (i.e. if any of AirIndicator(i) . . . AirIndicator(i−Nw) is not set to 1), then the method proceeds from step 192 to step 196. In step 196, the air-in-line sensitivity AILSens is updated to decrease the sensitivity using the equation AILSens=AILSens+Sensincr. The air-in-line sensitivity is decreased in step 196 because air was detected by the air-in-line indicator AILIndicator (i.e. AILIndicator(i)=1) but air was not detected by the plunger force indicator AIRindicator (i.e. none of the entries in the AirIndicator buffer=1) which demonstrates that the air-in-line indicator AILIndicator caused a false positive. To increase the robustness of the air-detection system in step 196 the sensitivity of the air-in-line indicator is decreased to reduce the occurrence of false positives. It is noted that to decrease the air-in-line sensitivity in step 196 the AILSens is actually increased because the larger the AILSens is the less sensitive the algorithm will be causing it to only detect larger air-slugs. The method proceeds from step 196 through location step 198 though location step 172 to step 174 and repeats the process steps.
In step 190, if the air-in-line indicator AILIndicator(i) is not set to 1 the method proceeds from step 190 to step 200. In step 200, a determination is made whether AirIndicator(i−Nw) is set to 1 (i.e. whether the plunger force indicator Nw cycles ahead of the air-in-line detector determined that air was in the infusion system to accommodate for the delay between the plunger force sensor and the air-in-line sensor). If the determination is made in step 200 that the AirIndicator(i−Nw) is not set to 1 the method proceeds from step 200 to step 202. In step 202, the AIL Sensitivity is not updated (i.e. AILSens remains equal to AILSens since neither the air-in-line indicator (AILIndicator) nor the plunger force indicator (AirIndicator) indicated that air was in the infusion system). The method proceeds from step 202 through location step 204 through location step 172 to step 174 and repeats the process steps.
If the determination is made in step 200 that the AirIndicator(i−Nw) is set to 1 the method proceeds from step 200 to step 206. In step 206, a determination is made whether the confidence indicator ConfIndicator(i−Nw) of the force algorithm (indicating the confidence level that air has been detected in the infusion system by the plunger force sensor by applying the force algorithm Nw cycles ahead of the air-in-line sensor) is greater than or equal to the confidence threshold (Conf_Thr). If the determination is made in step 206 that the confidence indicator of the force algorithm is not greater than or equal to the confidence threshold, the method proceeds from step 206 to step 202. In step 202, the air-in-line sensitivity AILSens is not updated (i.e. AILSens remains equal to AILSens since the air-in-line indicator (AILIndicator) did not indicate that air was in the infusion system and the plunger force indicator (AirIndicator) only indicated with low confidence that air was in the infusion system). The method proceeds from step 202 through location step 204 through location step 172 to step 174 and repeats the process steps.
If the determination is made in step 206 that the confidence indicator ConfIndicator(i−Nw) of the force algorithm is greater than or equal to the confidence threshold Conf_Thr, the method proceeds from step 206 to step 208. In step 208, the air-in-line sensitivity is updated to increase the sensitivity using the equation AILSens=AILSens−SensIncr. The air-in-line sensitivity is increased in step 208 because air was not detected by the air-in-line indicator AILIndicator (i.e. AILIndicator(i) was not set to 1) but air was detected by the plunger force indicator AIRIndicator with a high confidence level (AirIndicator(i−Nw) was set to 1 and the ConfIndicator(i−Nw) was greater than or equal to Conf_Thr) which demonstrates that the air-in-line indicator AILIndicator was not sensitive enough and caused a missed air-in-line AILIndicator detection of air. To increase the robustness of the air-detection system in step 208 the sensitivity of the air-in-line indicator is increased to reduce the occurrence of missed positive detections of air in the infusion system. It is noted that to increase the air-in-line sensitivity in step 208 the AILSens is actually decreased because the smaller the AILSens is the more sensitive the algorithm will be causing it to detect smaller air-slugs. The method proceeds from step 208 through location step 210 through location step 172 to step 174 and repeats the process steps. In other embodiments, the method 166 may be altered to vary the order or substance of any of the steps, to delete one or more steps, or to add one or more steps.
In step 214, the method starts. The method proceeds from step 214 to step 216. In step 216, the variables are set including setting sampling step i=0, setting the number Nw of pumping strokes of delay between the plunger force sensor and an air-in-line sensor, and setting the percent confidence threshold Conf_Thr to an initial setting. The method proceeds from step 216 through location step 218 to step 220. In step 220, sampling step i is reset to i=i+1. The method proceeds from step 220 to step 222.
In step 222, a plunger force algorithm is used to determine at sampling step i whether air is detected in a pumping chamber based on measurements of a plunger force sensor. The method proceeds from step 222 to step 224. In step 224, if air is detected in step 222 then an air indicator AirIndicator(i) is set to 1 and if air is not detected in step 222 then the air indicator AirIndicator(i) is set to 0. The method proceeds from step 224 to step 226. In step 226, a Buffer is saved as [AirIndicator(i) . . . AirIndicator(i−Nw)] saving the 1 or 0 setting made in step 224. For instance, if it takes 2 pumping strokes of the pump for the infusion fluid to travel from the plunger force sensor to the air-in-line sensor, then Nw is set to 2 to accommodate for this delay and the Buffer saves the AirIndicator(i) for the current sample i, the AirIndicator(i−1) for the previous sample i−1, and the AirIndicator(i−2) for two samples before. In step 228, a confidence indicator ConfIndicator(i) is set for the current sample i as to the percent confidence in the presence of air being present in the pumping chamber. The method proceeds from step 228 through location step 230 to step 236.
While the method proceeds from step 220 to 222, the method also simultaneously proceeds from step 220 to step 232. In step 232, an air-in-line algorithm is used to determine at sampling step i whether air is detected in a fluid-delivery-line of the infusion system based on measurements from the air-in-line sensor. The method proceeds from step 232 to step 234. In step 234, if air is detected in step 232 then an air-in-line AILIndicator(i) is set to 1 and if air is not detected in step 232 then the air-in-line AILIndicator(i) is set to 0. The method proceeds from step 234 through location step 230 to step 236.
In step 236, a determination is made as to whether the air-in-line indicator AILIndicator(i) equals 1. If it is determined in step 236 that the air-in-line indicator AILIndicator(i) equals 1, the method proceeds from step 236 to step 238. In step 238, if any of the buffer saved in step 226 is set to 1 (i.e. if any of AirIndicator(i) . . . AirIndicator(i−Nw) is set to 1), the method proceeds from step 238 to step 240 and determines that there is air in the infusion system. The method proceeds from step 240 to step 242 and turns on the alarm indicating that air is disposed in the infusion system since both the air-in-line indicator (AILIndicator) and the plunger force indicator (AirIndicator) indicated that air was in the infusion system (i.e. AILIndicator(i)=1 and one or more of the entries saved in the AirIndicator buffer=1). When the alarm is turned on in step 242, the infusion system is turned off automatically or manually by the clinician to stop the infusion of the infusion fluid.
In step 238, if any of the buffer saved in step 226 is not set to 1 (i.e. if any of AirIndicator(i) . . . AirIndicator(i−Nw) is not set to 1), the method proceeds from step 238 to step 244. In step 244, a determination is made that the air-in-line indicator AILIndicator resulted in a nuisance air-in-line determination since although the air-in-line indicator indicated that air was present no AirIndicator in the buffer indicated that air was present. The method proceeds from step 244 through location step 246 through location step 218 to step 220 and repeats the process steps.
If it is determined in step 236 that the air-in-line indicator AILIndicator(i) does not equal 1, the method proceeds from step 236 to step 248. In step 248, a determination is made whether AirIndicator(i−Nw) is set to 1 (i.e. whether the plunger force indicator Nw cycles ahead of the air-in-line detector determined that air was in the infusion system to accommodate for the delay between the plunger force sensor and the air-in-line sensor). If the determination is made in step 248 that the AirIndicator(i−Nw) is not set to 1 the method proceeds from step 248 through location step 250 through location step 218 to step 220 and repeats the process steps (since neither the air-in-line indicator AILIndicator nor the air indicator AirIndicator indicated that air was in the infusion system).
If the determination is made in step 248 that the AirIndicator(i−Nw) is set to 1 the method proceeds from step 248 to step 252. In step 252, a determination is made whether the confidence indicator ConfIndicator(i−Nw) of the force algorithm (indicating the confidence level that air has been detected in the infusion system by the plunger force sensor by applying the force algorithm Nw cycles ahead of the air-in-line sensor) is greater than or equal to the confidence threshold (Conf_Thr). If the determination is made in step 252 that the confidence indicator of the force algorithm is not greater than or equal to the confidence threshold, the method proceeds from step 252 through location step 254 through location step 218 to step 220 and repeats the process steps (since the air-in-line indicator AILIndicator did not indicate that air was in the infusion system and the air indicator AirIndicator did not confidently predict that air was in the infusion system).
If the determination is made in step 252 that the confidence indicator of the force algorithm is greater than or equal to the confidence threshold, the method proceeds from step 252 to step 256. In step 256, a determination is made that the air-in-line indicator AILIndicator wrongly determined that air was not present in the infusion system (since the air-in-line indicator AILIndicator did not indicate that air was in the infusion system but the air indicator AirIndicator confidently determined that air was in the infusion system). The method proceeds from step 256 to step 258. In step 258, the alarm is turned on indicating that air is disposed in the infusion system. When the alarm is turned on in step 258, the infusion system is turned off automatically or manually by the clinician to stop the infusion of the infusion fluid. In other embodiments, the method 212 may be altered to vary the order or substance of any of the steps, to delete one or more steps, or to add one or more steps.
In step 262, the method starts. The method proceeds from step 262 to step 264. In step 264, the variables are set including setting sampling step i=1 and setting the number Nw of pumping strokes of delay between a plunger force sensor and an air-in-line sensor. The method proceeds from step 264 through location step 266 to step 268. In step 268, a plunger force algorithm is used to determine at sampling step i whether air is detected in a pumping chamber based on measurements of a plunger force sensor. The method proceeds from step 268 to step 270. In step 270, if air is detected in step 268 then an air indicator AirIndicator(i) is set to 1 and if air is not detected in step 268 then the air indicator AirIndicator(i) is set to 0. The method proceeds from step 270 to step 272. In step 272, a Buffer is saved as [AirIndicator(i) . . . AirIndicator(i−Nw)] saving the 1 or 0 setting made in step 270. For instance, if it takes 2 pumping strokes of the pump for the infusion fluid to travel from the plunger force sensor to the air-in-line sensor, then Nw is set to 2 to accommodate for this delay and the Buffer saves the AirIndicator(i) for the current sample i, the AirIndicator(i−1) for the previous sample i−1, and the AirIndicator(i−2) for two samples before. The method proceeds from step 272 through location step 274 to step 280.
While the method proceeds from step 266 to 268, the method also simultaneously proceeds from step 266 to step 276. In step 276, an air-in-line single bubble algorithm and an air-in-line froth algorithm is used to determine at sampling step i whether a single bubble or forth is detected in a fluid-delivery-line of the infusion system based on measurements from the air-in-line sensor. The method proceeds from step 276 to step 278. In step 278, if a single bubble is detected in step 276 then a single bubble indicator SBIndicator(i) is set to 1 and if the single bubble is not detected in step 276 then the SBIndicator(i) is set to 0. Similarly, in step 278, if froth is detected in step 276 then a froth indicator FrothIndicator(i) is set to 1 and if the froth is not detected in step 276 then the froth indicator FrothIndicator(i) is set to 0. The method proceeds from step 278 through location step 274 to step 280.
In step 280, a determination is made as to whether either the single bubble indicator SBIndicator(i) is set to 1 or the froth indicator FrothIndicator(i) is set to 1. If step 280 determines that either the single bubble indicator SBIndicator(i) is set to 1 or the froth indicator FrothIndicator(i) is set to 1, then the method proceeds from step 280 to step 282. In step 282, a determination is made as to whether any of the buffer saved in step 272 is set to 1 (i.e. if any of AirIndicator(i) . . . AirIndicator(i−Nw) is set to 1). If step 282 determines that any of the buffer saved in step 272 is set to 1, then the method proceeds from step 282 to step 284 and turns on the alarm indicating that air is disposed in the infusion system since the plunger force indicator (AirIndicator) indicated that air was in the infusion system and either the single bubble indicator (SBIndicator) or the froth indicator (FrothIndicator) indicated that a single bubble or froth was in the infusion system. When the alarm was turned on in step 284, the infusion system is turned off automatically or manually by the clinician to stop the infusion of the infusion fluid.
If step 282 determines that none of the buffer saved in step 272 is set to 1, then the method proceeds from step 282 to step 286. In step 286, a nuisance alarm is turned on because the plunger force indicator AirIndicator found that no air was in the infusion system but the single bubble indicator SBIndicator or the froth indicator FrothIndicator detected that a single bubble or froth was present in the infusion system. The method proceeds from step 286 to step 288. In step 288, sampling step i is incremented to i=i+1. The method proceeds from step 288 through location step 266 to steps 268 and 276 and repeats the process steps.
If step 280 determines that neither the single bubble indicator SBIndicator(i) is set to 1 nor the froth indicator FrothIndicator(i) is set to 1, then the method proceeds from step 280 to step 288. In step 288, sampling step i is incremented to i=i+1. The method proceeds from step 288 through location step 266 to steps 268 and 276 and repeats the process steps. In another embodiment, if step 280 determines that neither the single bubble indicator SBIndicator(i) is set to 1 nor the froth indicator FrothIndicator(i) is set to 1, then the method can determine whether the plunger force indicator AirIndicator found that air was in the infusion system and if it did then a missed alarm can be turned on. In other embodiments, the method 260 may be altered to vary the order or substance of any of the steps, to delete one or more steps, or to add one or more steps.
In step 292, the method starts. The method proceeds from step 292 to step 294. In step 294, the variables are set including setting sampling step i=1, and setting the percent threshold Pct_Thr=80. The method proceeds from step 294 through location step 296 to step 298. In step 298, an air-in-line stuck droplet algorithm is used to determine at sampling step i whether a stuck droplet is detected in the infusion system based on measurements of an air-in-line sensor. The method proceeds from step 298 to step 300. In step 300, the stuck droplet state at sampling step i SDState(i) is determined as being either in a monitoring state, in a detection state, in an exit search state, or in an alarm state. The method proceeds from step 300 through location step 302 to step 308.
While the method proceeds from location step 296 to step 298, the method also simultaneously proceeds from location step 296 to step 304. In step 304, a plunger force algorithm is used to determine at sampling step i whether air is detected in a pumping chamber based on measurements of a plunger force sensor. The method proceeds from step 304 to step 306. In step 306, if air is detected in step 304 then an air indicator AirIndicator(i) is set to 1 and if air is not detected in step 304 then the air indicator AirIndicator(i) is set to 0. The method proceeds from step 306 through location step 302 to step 308.
In step 308, a determination is made based on the determination of step 300 whether the stuck droplet state at sampling step i SDState(i) is in a monitoring state. In the monitoring state, the algorithm will search for a stuck droplet pattern. If in step 308 the determination is made that the stuck droplet state at sampling step i SDState(i) is in a monitoring state, then the method proceeds to step 310. In step 310, the sampling step i is set to i=i+1 in order to advance to the next sampling step in order to monitor the next sample (i.e. the next pumping stroke). The method proceeds from step 310 to location step 296 and repeats the process steps.
If in step 308 the determination is made that the stuck droplet state at sampling step i SDState(i) is not in a monitoring state then the method proceeds to step 312. In step 312, a determination is made based on the determination of step 300 whether the stuck droplet state at sampling step i SDState(i) is in a detection state. In the detection state, the algorithm detects a possible stuck droplet pattern and has to decide if it is a match or not. If in step 312 the determination is made that the stuck droplet state at sampling step i SDState(i) is in a detection state, then the method proceeds to step 314. In step 314, a Buffer is saved as [AirIndicator(i) . . . ] saving the AirIndicator(i) determination made in step 306 for the current sample i as being 1 or 0. The Buffer will continue to save all AirIndicator(i) determinations made in step 306 for all samples i until the Buffer is reset. It is noted that the values in the Buffer will later be used to determine in the alarm state whether the air-in-line algorithm decision as to whether air is in the infusion system is a nuisance or a true alarm. The method then proceeds from step 314 to step 310. In step 310, the sampling step i is set to i=i+1 in order to advance to the next sampling step in order to monitor the next sample (i.e. the next pumping stroke). The method proceeds from step 310 to location step 296 and repeats the process steps.
If in step 312 the determination is made that the stuck droplet state at sampling step i SDState(i) is not in a detection state, then the method proceeds to step 316. In step 316, a determination is made based on the determination of step 300 whether the stuck droplet state at sampling step i SDState(i) is in an exit search state. In the exit search state, the algorithm decides that the suspected stuck droplet pattern is not a match and therefore is not a stuck droplet. If in step 316 the determination is made that the stuck droplet state at sampling step i SDState(i) is in an exit search state, then the method proceeds to step 318. In step 318, the Buffer saved in 314 is reset/cleared so that all previously stored values are deleted. The method proceeds from step 318 to step 310. In step 310, the sampling step i is set to i=i+1 in order to advance to the next sampling step in order to monitor the next sample (i.e. the next pumping stroke). The method proceeds from step 310 to location step 296 and repeats the process steps.
If in step 316 the determination is made that the stuck droplet state at sampling step i SDState(i) is not in an exit search state, then the method proceeds to step 320. In step 320, a determination is made based on the determination of step 300 that the stuck droplet state at sampling step i SDState(i) is in an alarm state. The method proceeds from step 320 to step 322. In step 322, an X value is saved and a Y value is saved. The X value comprises the number of 1 values saved in the Buffer of step 314. The Y value comprises the overall number of values saved in the Buffer of step 314. For instance, if the Buffer of step 314 is saved as [1 0 0 1 0] then X=2 because there are two 1 values saved and Y=5 because there are five overall 1's and O's saved. The method proceeds from step 322 to step 324. In step 324, a determination is made as to whether 100 multiplied by X/Y is greater than or equal to the percent threshold Pct_Thr of 80 set in step 294 (whether 100*XIY is greater than or equal to Pct_Thr). If in step 324 the determination is made that 100 multiplied by X/Y is not greater than or equal to the percent threshold Pct_Thr of 80 set in step 294 then the method proceeds to step 326. For instance, if X=2 and Y=5 then 100*2/5=40 which is not greater than or equal to Pct_Thr of 80 so the method would proceed to step 326. In step 326, a nuisance alarm is turned on and the infusion is not stopped because less than the threshold number of the buffer determinations, made by the plunger force algorithm, determined that air was in the infusion system leading to the determination that the stuck droplet alarm state set in step 320 was a nuisance alarm. The method proceeds from step 326 to step 310. In step 310, the sampling step i is set to i=i+1 in order to advance to the next sampling step in order to monitor the next sample (i.e. the next pumping stroke). The method proceeds from step 310 to location step 296 and repeats the process steps.
If in step 324 the determination is made that 100 multiplied by X/Y is greater than or equal to the percent threshold Pct_Thr of 80 set in step 294 then the method proceeds to step 328. For instance, if the Buffer set in step 314 is [1 1 1 0 1] then X=4 and Y=5 and 100*4/5=80 which is greater than or equal to Pct_Tur of 80 so the method would proceed to step 328. In step 328, an alarm is turned on indicating that air is contained in the infusion system because greater than or equal to the threshold number of the buffer determinations, made by the plunger force algorithm, determined that air was in the infusion system leading to the determination that the stuck droplet alarm state set in step 320 was a true air alarm. When the alarm is turned on in step 328, the infusion system is turned off automatically or manually by the clinician to stop the infusion of the infusion fluid. In other embodiments, the method 290 may be altered to vary the order or substance of any of the steps, to delete one or more steps, or to add one or more steps.
Similarly, the X-axis of graph 332 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 332 represents air indicator determinations made based on the air-in-line sensor readings of the corresponding graph 330. The portion 336 of the plotted air indicator readings shows that the air indicator readings substantially increase and then decrease around 3,325 seconds to 3,350 seconds based on the air-sensor readings of the corresponding graph 330. This portion 336 would result in a false positive detection of air when using a typical single-sensor based air-in-line algorithm. This false positive is caused by dancing micro bubbles of air in the infusion system. This is problematic as the infusion system would be shut down due to this false positive creating an improper delay in therapy to the patient.
Similarly, the X-axis of graph 340 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 340 represents force profile readings in pounds taken by a plunger force sensor connected to the infusion system. The plotted portion 346 of the force profile readings shows that the plot is substantially uniform during the entire time plotted from 3,200 seconds to 3,600 seconds which does not indicate that air is in the infusion system.
Similarly, the X-axis of graph 342 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 342 represents air indicator determinations made by integrating the air-sensor readings and the force profile readings of the corresponding graphs 338 and 340. The plotted portion 348 of the air indicator readings shows that the air indicator readings stayed at 0 during the entire time plotted from 3,200 seconds to 3,600 seconds based on the integrated air-sensor readings and force profile readings of the corresponding graphs 338 and 340. As a result, the use of multiple different types of sensors to monitor the infusion system has eliminated the false positive detection of air which occurred when the same infusion system was tested using only a single type of sensor. This improves accuracy and avoids unnecessary shut-downs of the infusion system.
In step 360, an air sensor determines how much of a signal propagates through a fluid delivery line of the infusion system. In step 362, an air-in-line algorithm is applied using the air sensor measurements of step 360 in order to detect whether air is located in the fluid delivery line at the air sensor based on the air sensor measurements. In step 364, a single qualifier algorithm is applied which uses both the results of the application of the force algorithm in step 358 and the results of the application of the air-in-line algorithm of step 362 in order to determine whether air is in the infusion system. The qualifier algorithm of step 364 integrates the decisions of steps 358 and 362 which were based on the measurements of the proximal pressure sensor, the distal pressure sensor, the force sensor, and the air sensor and in doing so considers the delays between the proximal force sensor, the distal pressure sensor, the force sensor, and the air sensor which results due to the distances between them.
In such manner, by considering the air results of different types of sensors at different locations a more accurate determination is made as to whether air is contained in the infusion system. This avoids false positives or nuisance alarms caused by a reading by one sensor at one location which is either inaccurate or caused by an issue such as bouncing air bubbles, a stuck droplet, or froth in the infusion system which otherwise would lead to an inaccurate determination as to the presence of air in the infusion system. In step 366, the alarm device turns on an alarm if step 364 determines that air is in the infusion system. In other embodiments, the method 350 may be altered to vary the order or substance of any of the steps, to delete one or more steps, or to add one or more steps.
In step 370, the method starts. The method proceeds from step 370 to step 372. In step 372, the variables are set including setting a sampling step k=1, a baseline which is a force profile associated with fluid, setting a force threshold for air detection Air_Thr, setting a force threshold for occlusion detection Occl_Thr, setting a pressure threshold Press_Thr, and setting a forgetting factor λ. It is noted that throughout this disclosure that k represents one stroke of the pump of the infusion system. The method proceeds from step 372 through location step 374 to step 376. In step 376, a force profile X(k) is acquired for the current sample of the pumping cycle of the infusion system. It is noted that the force profile X(k) represents a plurality of force readings which are taken during each stroke k of the pump. For instance, in one embodiment six force readings may be taken at various points of each stroke k of the pump. In other embodiments, any number of force readings may be taken throughout each stroke k of the pump. The method proceeds from step 376 through location step 378 to step 382.
While the method proceeds from location step 374 to step 376, the method also simultaneously proceeds from location step 374 to step 380. In step 380, a pressure profile Y(k) is acquired for the current sample of the pumping cycle of the infusion system. It is noted that the pressure profile Y(k) represents a plurality of pressure readings which are taken during each stroke k of the pump. For instance, in one embodiment six pressure readings may be taken at various points of each stroke k of the pump. In other embodiments, any number of pressure readings may be taken throughout each stroke k of the pump. The method proceeds from step 380 through location step 378 to step 382.
In step 382, a force difference D(k) for the current sample k of the pumping cycle is determined by subtracting the baseline from the force profile X(k) for the current sample k, wherein the equation is D(k)=X(k)−baseline. The method proceeds from step 382 to step 384. In step 384, a determination is made as to whether the minimum value of the force difference min(D(k)) for the current sample k is less than the force threshold for air detection Air_Tur. If the determination is made in step 384 that the minimum value of the force difference min(D(k)) for the current sample k is less than the force threshold for air detection Air_Tur then the method proceeds to step 386. This drop in the force profile indicates a transition from fluid to air since air is more compressible than fluid resulting in less force. In step 386, a determination is made that air has been detected and a qualifier algorithm may be applied to determine whether to stop the infusion.
If the determination is made in step 384 that the minimum value of the force difference min(D(k)) for the current sample k is not less than the force threshold for air detection Air_Thr then the method proceeds to step 388. In step 388, a determination is made whether the maximum value of the force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for occlusion detection Occl_Thr. If the determination is made in step 388 that the maximum value of the force difference max(D(k)) for the current sample k is not greater than or equal to the force threshold for occlusion detection Occl_Thr then the method proceeds to step 390. It is noted that during an occlusion the plunger force readings are higher than in non-occlusion conditions. In step 390, a determination is made that an occlusion has not been detected and the occlusion indicator OccIndicator is set to 0 because air was not detected and a significant increase in the force difference was not detected. The method proceeds from step 390 to step 392. In step 392, the baseline is updated using the equation baseline=((1−forgetting factor λ)*baseline)+(forgetting factor λ*force profile X(k)). It is noted that unless an occlusion is detected, the method updates the baseline to account for the variability seen in the force-profiles due to medication type, tubing type, PMC, ambient temperature, or other factors. The method proceeds from step 392 to step 394. In step 394, the sampling step k is increased using the equation k=k+1. The method proceeds from step 394 to location step 374 and repeats the process steps.
If the determination is made in step 388 that the maximum value of the force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for occlusion detection Occl_Thr then the method proceeds to step 396. In step 396, a determination is made as to whether the maximum value of the pressure profile max(Y(k)) for the current sample k is greater than the pressure threshold Press_Thr. If the determination is made in step 396 that the maximum value of the pressure profile max(Y(k)) for the current sample k is not greater than the pressure threshold Press_Thr then the method proceeds to step 390. In step 390, a determination is made that an occlusion has not been detected and the occlusion indicator OccIndicator is set to 0 because air was not detected, and although a significant increase in the force difference was detected a significant increase in the pressure profile was not detected. The method proceeds from step 390 to step 392. In step 392, the baseline is updated using the equation baseline=((1−forgetting factor λ)*baseline)+(forgetting factor λ*force profile X(k)). It is noted that unless an occlusion is detected, the method updates the baseline to account for the variability seen in the force-profiles due to medication type, tubing type, PMC, ambient temperature, or other factors. The method proceeds from step 392 to step 394. In step 394, the sampling step k is increased using the equation k=k+1. The method proceeds from step 394 to location step 374 and repeats the process steps.
If the determination is made in step 396 that the maximum value of the pressure profile max(Y(k)) for the current sample k is greater than the pressure threshold Press_Thr then the method proceeds to step 398. In step 398, a determination is made that an occlusion has been detected and the occlusion indicator OccIndicator is set to 1 because air was not detected, a significant increase in the force profile was detected, and a significant increase in the pressure profile was detected. The method proceeds from step 398 to step 400. In step 400, the baseline is not updated so that the baseline=baseline. The baseline is not updated to eliminate/discard the changes in the force measurement which may be caused by the applied pressure/occlusion in order to eliminate false air-detections. The method proceeds from step 400 to step 394. In step 394, the sampling step k is increased using the equation k=k+1. The method proceeds from step 394 to location step 374 and repeats the process steps. In other embodiments, the method 368 of
Similarly, the X-axis of graph 404 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 404 represents air indicator determinations made based on the force profile sensor readings of the corresponding graph 402. The portion 408 of the plotted air indicator readings shows that the air indicator readings substantially increase around 155 seconds based on the force profile sensor readings of the corresponding graph 402 which were due to the temporary distal occlusion. This portion 404 would result in a false positive detection of air when using a typical single-sensor based force-profile algorithm. This false positive is caused by the temporary occlusion. This is problematic as the infusion system would be shut down due to this false positive creating an improper delay in therapy to the patient.
Similarly, the X-axis of graph 412 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 412 represents distal pressure readings in psi taken by a distal pressure sensor connected to the infusion system. The plotted portion 418 of the distal pressure readings shows that the distal pressure substantially increases and then decreases around 125 seconds to 155 seconds which indicates that an occlusion was present and then dissolved and may have been the reason that the force profile of graph 410 increased from the period of around 125 seconds to 155 seconds. The decrease of the force profile of graph 410 around 155 seconds may have been due to the release of the occlusion rather than air being in the infusion system.
Similarly, the X-axis of graph 414 represents the corresponding time in seconds during the infusion of infusion fluid delivered by the infusion system. The Y-axis of graph 414 represents air indicator determinations made by integrating the force profile readings and the distal pressure readings of the corresponding graphs 410, and 412. The plotted portion 420 of the air indicator readings shows that the air indicator readings stayed at 0 during the entire time plotted from 0 seconds to 200 seconds based on the integrated force profile readings and the distal pressure readings of the corresponding graphs 410 and 412. As a result, the use of multiple different types of sensors to monitor the infusion system has eliminated the false positive detection of air which occurred when the same infusion system was tested using only a single type of sensor when a temporary occlusion was present. This improves accuracy and avoids unnecessary shut-downs of the infusion system.
In step 458, the method starts. The method proceeds from step 458 to step 460. In step 460, the variables are set including sampling step k=0, setting the initial force profile associated with fluid X(O), setting the force threshold for total occlusion Force_Thr1, setting the force threshold for partial occlusion Force_Thr2, setting the pressure threshold for total occlusion Press_Thr1, and setting the pressure threshold for partial occlusion Press_Thr2. It is noted that the force threshold for total occlusion Force_Thr1 is greater than the force threshold for partial occlusion Force_Thr2. It is further noted that the pressure threshold for total occlusion Press_Thr1 is greater than the pressure threshold for partial occlusion Press_Thr2. The method proceeds from step 460 through location step 462 to step 464. In step 464, the sampling step k is set to k=k+1. The method proceeds from step 464 to step 466. In step 466, a force sensor is used to determine a force profile X(k) at sampling step k based on measurements of the force sensor. It is noted that the force profile X(k) represents a plurality of force readings which are taken during each stroke k of the pump. For instance, in one embodiment six force readings may be taken at various points of each stroke k of the pump. In other embodiments, any number of force readings may be taken throughout each stroke k of the pump. The method proceeds from step 466 through location step 468 to step 472.
While the method proceeds from step 464 to step 466, the method also simultaneously proceeds from step 464 to step 470. In step 470, a pressure sensor is used to determine a pressure profile Y(k) at sampling step k based on measurements of the pressure sensor. It is noted that the pressure profile Y(k) represents a plurality of pressure readings which are taken during each stroke k of the pump. For instance, in one embodiment six pressure readings may be taken at various points of each stroke k of the pump. In other embodiments, any number of pressure readings may be taken throughout each stroke k of the pump. The method proceeds from step 470 through location step 468 to step 472. In step 472, a force difference D(k) at sampling step k is determined by using the equation force profile X(k)−force profile X(k−1) (i.e. subtracting the force profile for the previous sampling step X(k−1) from the current sampling step force profile X(k)). The method proceeds from step 472 to step 474. In step 474, a determination is made as to whether the maximum pressure profile max(Y(k)) for the current sample k is greater than or equal to the pressure threshold for total occlusion Press_Thr1. If in step 474 a determination is made that the maximum pressure profile max(Y(K)) for the current sample k is greater than or equal to the pressure threshold for total occlusion Press_Thr1 then the method proceeds to step 476. In step 476, a determination is made as to whether the maximum force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for total occlusion Force_Thr1. If step 476 determines that the maximum force difference max(D(k)) for the current sample k is not greater than or equal to the force threshold for total occlusion Force_Thr1 then the method proceeds through location step 478 through location step 462 to step 464 and repeats the process steps.
If step 476 determines that the maximum force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for total occlusion Force_Thr1 then the method proceeds to step 480 and determines that there is a total occlusion. At this point, an alarm may be turned on and/or the infusion system may be turned off.
If in step 474 a determination is made that the maximum pressure profile max(Y(K)) for the current sample k is not greater than or equal to the pressure threshold for total occlusion Press_Thr1 then the method proceeds to step 482. In step 482, a determination is made as to whether the maximum pressure profile max(Y(k)) for the current sample k is greater than or equal to the pressure threshold for partial occlusion Press_Thr2. If step 482 determines that the maximum pressure profile max(Y(k)) for the current sample k is not greater than or equal to the pressure threshold for partial occlusion Press_Thr2 then the method proceeds from step 482 through location step 484 though location step 462 to step 464 and repeats the process steps.
If step 482 determines that the maximum pressure profile max(Y(k)) for the current sample k is greater than or equal to the pressure threshold for partial occlusion Press_Thr2 then the method proceeds from step 482 to step 486. In step 486, a determination is made as to whether the maximum force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for partial occlusion Force_Thr2. If step 486 determines that the maximum force difference max(D(k)) for the current sample k is not greater than or equal to the force threshold for partial occlusion Force_Thr2 then the method proceeds through location step 488 through location step 462 to step 464 and repeats the process steps.
If step 486 determines that the maximum force difference max(D(k)) for the current sample k is greater than or equal to the force threshold for partial occlusion Force_Thr2 then the method proceeds to step 490 and determines that there is a partial occlusion. At this point an alarm may be generated or turned on and/or the infusion system may be turned off. In other embodiments, the method 456 of
The Abstract is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in various embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separately claimed subject matter.
While particular aspects of the present subject matter described herein have been shown and described, it will be apparent to those skilled in the art that, based upon the teachings herein, changes and modifications may be made without departing from the subject matter described herein and its broader aspects and, therefore, the appended claims are to encompass within their scope all such changes and modifications as are within the true scope of the subject matter described herein. Furthermore, it is to be understood that the disclosure is defined by the appended claims. Accordingly, the disclosure is not to be restricted except in light of the appended claims and their equivalents.
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| Number | Date | Country | |
|---|---|---|---|
| 20210260283 A1 | Aug 2021 | US |
| Number | Date | Country | |
|---|---|---|---|
| 61827111 | May 2013 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16039637 | Jul 2018 | US |
| Child | 17135574 | US | |
| Parent | 14285797 | May 2014 | US |
| Child | 16039637 | US |
