WO2010048088A1 - Infusion pump and method of in situ measuring the diameter of an infusion tube - Google Patents
Infusion pump and method of in situ measuring the diameter of an infusion tube Download PDFInfo
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- WO2010048088A1 WO2010048088A1 PCT/US2009/061169 US2009061169W WO2010048088A1 WO 2010048088 A1 WO2010048088 A1 WO 2010048088A1 US 2009061169 W US2009061169 W US 2009061169W WO 2010048088 A1 WO2010048088 A1 WO 2010048088A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tubing
- sensor
- infusion pump
- pump
- shuttle
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/14228—Pumping with an aspiration and an expulsion action with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/14232—Roller pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
- F04B43/082—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/14—Detection of the presence or absence of a tube, a connector or a container in an apparatus
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3317—Electromagnetic, inductive or dielectric measuring means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3375—Acoustical, e.g. ultrasonic, measuring means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16804—Flow controllers
Definitions
- the field of the present disclosure invention is infusion pumps and relates generally to systems, apparatuses, and methods for pumping or infusing volumes of medical fluids to a patient, typically via an intravenous route.
- Infusion pumps are used to infuse drugs and liquids into patients, typically via intravenous lines. While some infusion pumps deal with relatively large volumes, there may be more interest in pumps with a capability of delivering only very small controlled volumes of liquid.
- the drugs used may be very important, such as analgesics, anesthetics including opiates, anti-inflammatory agents, insulin, anti-spasmodic drugs, antibiotics, chemotherapy agents, cardiovascular drugs, and the like. Many of these drugs are needed in very low doses on a continuous basis, so that the patient has a steady, reliable stream over a long period of time, such as 0.1 ml per hour. If pulses are used, the dosage rate may be measure in terms of nanoliters or microliters per pulse or bolus. Regardless of whether a small volume or larger volume pump is being used, the accuracy of the pump is to a successful outcome for the patient.
- Some infusion pumps have, along the length of tubing, a pumping chamber having an inlet valve and an outlet valve.
- the infusion fluid is admitted into a length of tubing in the pumping chamber through an open inlet valve and then isolated by occluding the tube by closing the inlet valve at an inlet of the tubing.
- the outlet valve is opened and a pumping mechanism compresses or otherwise massages the length of tubing in question to pump or expel the fluid from the pumping chamber and towards the patient. Since the inlet is blocked by the closed valve, the liquid can only exit through the outlet, with an open valve.
- the outlet valve is then closed and the inlet valve and pumping mechanism opened to permit additional fluid to enter the pumping chamber from a fluid source.
- the above is something referred to as a singe pumping cycle or stroke.
- the pumping mechanism can comprise a single pumping member that compresses the tube against a stationary block or platen.
- the pumping member or platen may have a length substantially similar to that between the inlet and outlet valves.
- the pumping mechanism may comprise a plurality of pumping fingers or members that compress the tube in sequence. In this instance, particularly if there are sufficient pumping fingers, such that at least one is compressing the tube at all times, there may be no need for an inlet and/or outlet valves.
- the accuracy of an overall infusion is dependent upon the accuracy of each pumping cycle. In other words, it is important to know with accuracy the volume of fluid pumped with each pumping cycle, to know over time the volume of the entire infusion.
- the volume of each pumping cycle is dependent upon the internal diameter of the tube.
- the pump can use this information to avoid overly compressing the tube (decreases tube life due to overstressing) and under compressing the tube (leads to inaccuracies and inefficiencies).
- Infusion pumps are used to accurately infuse medicines and other liquids to patients.
- the amount that is dispensed could be improved by an accurate knowledge of the inner dimensions of the particular tubing used to dispense a particular liquid to a patient.
- the present disclosure includes an infusion pump that can deliver a prescribed amount of medicine, such as insulin or morphine, to a patient.
- the pump accurately delivers the prescribed amount of the proper medicine in order to insure the best possible outcome for the patient.
- the pump operates with tubing, and in particular with a contact length of the tubing, to convey the medicine from a source, such as an intravenous ("IV") container, through the contact length, such that medicine does not contact air, risking exposure to contaminants to the patient.
- IV intravenous
- the tubing is made typically by extruding the plastic material through a die.
- the dimensions of the resulting tubing, such as the inner diameter or the outer diameter can vary by as much as three or four percent.
- the present pump overcomes this problem by determining the actual dimensions of the contact portion of the tubing during use.
- the infusion pump operates with at least one sensor that measures the distance between physical constraints holding the tubing at the contact area.
- the physical constraints can include a stationary surface or platen and a moving surface or platen between which the tubing is compressed and decompressed.
- one method and corresponding system includes the steps of loading tubing into a fixture, compressing the tubing between opposed surfaces of the fixture, receiving a signal indicative of compression of the tubing while compressing, receiving a signal indicative of a contact length of the tubing against at least one of the opposed surfaces, and calculating a diameter and a thickness of the tubing.
- Another method and corresponding system includes steps of loading tubing into a fixture, compressing the tubing between opposed surfaces of the fixture, generating and receiving a signal indicative of a distance between the opposed surfaces while compressing, generating and receiving a signal indicative of a contact length of the tubing against at least one of the opposed surfaces, and calculating an inner diameter and a thickness of the tubing.
- the methods are systems as discussed are particularly well suited for an infusion pump.
- the infusion pump includes a tubing clamping section having a moveable portion and a stationary portion, a first sensor mounted on one of the movable portion or the stationary portion for detecting a distance between the movable portion and the stationary portion, at least one second sensor for detecting a contact length of tubing with at least one of the movable portion and the stationary portion, an inlet valve, an outlet valve, and a shuttle having a shuttle stationary portion and a shuttle moveable portion configured for squeezing a length of tubing between the shuttle stationary portion and the shuttle movable portion, wherein the shuttle moveable portion moves toward and away from the shuttle stationary portion to operate the infusion pump.
- the infusion pump alternatively includes a housing, a tubing clamping section having a movable portion and a stationary portion, the tubing clamping section mounted on the housing, a first sensor mounted on one of the movable portion or the stationary portion for detecting a distance between the movable portion and the stationary portion, at least one second sensor for detecting a contact length of tubing with at least one of the movable portion and the stationary portion, and a positive displacement pump for manipulating the tubing to accurately deliver a medicament.
- FIG. 1 is an elevation view of a shuttle-type infusion pump having a tubing measurement system and method of the present disclosure.
- Fig. 2 is a schematic flow diagram illustrating, in a general way, an algorithum used by a pump controller to perform the tubing measurements of the present disclosure.
- Figs. 3 A, 3B and 4A to 4C are elevation section views of the tube contact portion of the shuttle-type pump infusion pump of Fig. 1, depicting the compression of tubing in a fixture.
- FIGs. 5 A and 5B are elevation section views depicting one embodiment of an apparatus and method for measuring tubing compression.
- Fig. 6 is a perspective view illustrating a planar sensor array for use in the embodiment of Figs. 5A and 5B.
- FIGs. 7A and 7B are elevation section views depicting one embodiment of an apparatus and method for measuring a distance between two platens.
- FIGs. 8A and 8B are elevation section views depicting one embodiment of an apparatus and method for measuring a distance between two platens and a contact length of the tubing with the upper platen.
- Figs. 9 to 11 are graphical views depicting sensor readings taken in the above apparatus and methods.
- Figs. 12A to 12D are various views depicting one system and method for correcting tubing offsets.
- Fig. 13 depicts an alternative cam driven pump embodiment of the tubing measurement apparatus and method of the present disclosure.
- Infusion pump 50 includes tubing 16, an inlet valve 52, an outlet valve 53, and a shuttle portion 10 having an upper moving platen 12 and a lower stationary platen 14. Valves 52 and 53 and the shuttle portion 10 are actuated by linear actuators 54a to 54c, respectively.
- a pump controller 100 which can operate with other processors of infusion pump 50, such as a supervisory processor and a safety processor (not shown), controls pump 50 and its linear actuators 54a to 54c.
- actuator 54a opens inlet valve 52.
- Actuator 54b closes outlet valve 53 and actuator 54c retracts platen 12, allowing tubing 16 to open to receive a liquid medication, e.g., via gravity.
- Actuators 54a and 54b then cause the states of valves 52 and 53 to reverse, respectively, and actuator 54c pushes platen 12 towards platen 14 to compress tubing 51, dispelling the volume of fluid that just filled tubing 51 between platens 12 and 14.
- a sensor 18, 19 (e.g., sensor pair) is imbedded into moving platen 12 and stationary platen 14.
- a transmitter 18 can be attached to moving platen 12, while a receiver 19 is in turn attached to stationary platen 14.
- the transmitter 18 and receiver 19 respectively send and receive signals and detect the distance between the pair as discussed below.
- a first step 101 in the process is to load the tubing into shuttle portion 10 discussed above. Once loaded, the tubing is compressed at step 102 between two opposed surfaces with sensors that measure a distance between the surfaces, and that measure a contact length between the tubing and at least one of the surfaces. While the testing is taking place, controller 100 monitors the sensors at step 103 for changes in signal output. Movement of the surfaces may be stopped, as seen at step 104, when there is almost no change in the signal.
- shuttle portion 10 of the infusion pump 50 of Fig. 1 is shown in more detail and includes a lower platen, stationary platen 14 and an upper, moving platen 12, which operate with tubing 16.
- the lower platen 14 is parallel to the upper moving platen 12 in the illustrated embodiment.
- Tubing 16 is typically PVC, but may also be made from polyethylene, polypropylene, another medically-acceptable plastic, or a combination of these. In Fig. 3 A, prior to compression, tubing 16 has a tubing thickness t and an outer radius Ro when placed initially into shuttle portion 10.
- tubing 16 When the movable platen 12 is closed, as shown Fig. 3B, tubing 16 is compressed.
- d is the distance between the upper and lower platens 12 and 14
- r is the radius of the continuously changing tubing curves, and wherein the points at which the tubing separates from the platens defines a tangential contact distance of the tubing with the platens.
- a length 1 of the tubing defines such contact distance with the upper and lower platens 12, 14, and wherein the edges of length 1 define tangential release points.
- the total outer curve length of the tubing 16 will not change during compressing, the total outer curve length equal to its circumference when the tubing 16 is in the shape of a circle equals 2 ⁇ Ro.
- the total outer curve length equals the length of the two newly-formed semicircles, 2 ⁇ r (or ⁇ d) + twice the contact length 1.
- R 0 the actual radius of the tubing, it is seen that Ro is d/2 + 1/ ⁇ .
- the tubing 16 is just tangent to the platens 12, 14. In this case, the distance d between the two platens is exactly the outer diameter, 2Ro, of tubing 16.
- the contact length is thus zero and twice this length, 21, is also zero. Therefore, the circumference of the tubing is ⁇ times measured distance d, the diameter, equal to 2 ⁇ r, or in this instance, 2 ⁇ Ro.
- the area within a plane of the tubing is ⁇ times the inner radius squared, and the volume is calculated by multiplying by the length of tubing or the length of liquid that is propelled by the infusion pump.
- the tubing in theory can be compressed to any position.
- contact lengths I 1 , I 2 are taken at two different distances, di and d 2 .
- the difference in contact lengths I 1 and I 2 is proportional to the difference in platen distance d during the step of compressing.
- the change in contact length 1 can be determined by the change in platen distance d.
- multiple tests can be performed by compressing tubing to many different positions, and then using an average of all the calculations to arrive at a more accurate value.
- FIGs. 4A to 4C depict a typical situation in which tubing 16 is compressed when moveable pump platen 12 is closed, squeezing tubing 16 against lower fixed platen 14.
- the distance d between the platens 12, 14 is measured by an ultrasonic sensor (sensor pairs
- infusion pumps already include an ultrasonic sensor, which is used as an air-in-line sensor. This often times pre-existing sensor can be used for sensor 18, 19 of infusion pump 50 (Fig. 1).
- Other embodiments may use a capacitive sensor, linear transducers such as linear variable differential transformer (“LVDT”), or other distance-measuring sensor.
- LVDT linear variable differential transformer
- controller 100 can use sensor 18, 19 to see that the distance d is no longer changing and determine that tube 16 is compressed fully as seen in Fig. 4C. Even before full compression, distance sensor 18, 19 shows that the distance d, is changing very slowly as platens 12 and 14 closely approach each other, separated only by the thickness of the tubing itself, with no air or liquid within.
- actuator 54c applies a force to upper platen 12, to close the platen against fixed platen 14.
- a force sensor can also or alternatively be provided and look for an increase in force to signal the complete compression of Fig. 4C.
- a power or current draw of actuator 54c can also or alternatively be monitored to look for an increase in current draw, indicating full compression.
- shuttle portion 10 includes a moving upper portion or platen 12, a bottom platen 14, and tubing 16.
- platen 12 is propelled by a motor 20 (e.g., linear) with an encoder 22.
- the motor may include a lead screw, a ball screw, jackscrew, and so forth, to convert rotational motion to translational motion, to move platen 12 against tubing 16.
- Motor 20 and encoder 22 are connected to controller 100, shown above, which provides positional information that controller 100 can use and also convert to rate information.
- Controller 100 controls motor 20 and records data from encoder 22, regarding the shaft of position of motor 20 and converts that position, or change in position into an accurate calculation of the change in translational position of platen 12. Beginning from a known position, the travel and position of the platen 12 can be determined at any time using the information from the encoder, tracking an recoding distance d over many, many discrete time segments during the compression of tubing 16.
- Figs. 5A, 5B and 6 show a sensor array 24.
- Sensor array 24 includes at least two sensors 26 separated by a distance 1. As shown in Fig. 6, there may be one or more columns or rows of at least two sensors 26 each, each column or row separated by a distance 1, which may be the same or may be different. For many applications, a single row of two sensors 26 may be adequate.
- the two sensors 26 detect the presence of tubing 16 between the sensors 26. When the tubing 16 no longer in contact with the sensors 26, the sensors 26 will not indicate the presence of the tubing. This situation may occur the tubing has only tangential contact points with platens 12 and 14.
- the distance 1 between the sensors 26 may be set at the length in which the edges of the tubing are just in contact with the sensors when the distance d between the platens is 2t.
- the platens 12, 14, will be separated by a distance d when there is a known amount of tubing compression, the tubing length reaches length 1, and the tubing thickness is about 2t.
- measurements may be taken and calibration data points used to measure the length of tubing 1 in contact with the platens and sensors when the platens are separated by a distance d and the tubing 16 in contact with the platens has thickness 2t.
- the sensors 26 of array 24 are capable of detecting the presence of the tubing when the tubing presses against platens 12 and 14 of shuttle portion 10.
- small compact pressure sensors, capacitive or inducting sensors may be used.
- Sensors 26 detect the presence of the flattened-out portion of tubing 16 shown above. Sensors 26 will cease to detect the presence of tubing 16 when the tubing is only tangentially contacting the platens.
- a pressure sensor 26, for example, will show a rapid rise or run-up in pressure when tubing 16 contacts the sensor. When the pressure is removed, the fall-off of pressure and the pressure signal will be just as rapid.
- a capacitive sensor 26 will operate in a similar manner, with a rapid detection of tubing material, especially wet material, as the tubing approaches the capacitive sensors, e.g., two capacitive sensors 26 spaced apart a known distance 1.
- Figs. 7A and 7B depict shuttle portion 10 again having a stationary platen 14, a moving platen 12, and a length of infusion pump tubing 16.
- a capacitive sensor 30 is mounted on the top or moving platen 12, and a target 32 is mounted on the lower, stationary platen 14.
- capacitive sensor 30 detects the target 32 on bottom platen 14. Calibration of pump 50 (Fig. 1) with sensor 30 makes accurate detection using a capacitive sensor possible. It will be recognized that in this configuration, other proximity sensors may be used, e.g., inductive and ultrasonic sensors. Such proximity sensors are small and unobtrusive relative to the operation of infusion pump 50 (Fig. 1). Target 32 is equally unobtrusive. For example, target 32 may simply be a small bead or square of metal molded into platen 14 or other part of the body of infusion pump 50 located near moving platen 12.
- shuttle portion 10 includes a top platen 12 and bottom platen 14, which receive round plastic tubing 16.
- Top platen 12 is equipped with two types of sensors, a proximity sensor 34 and two microswitches 36.
- Bottom platen 14 is equipped with a mating sensing object 38 for proximity sensor 34. If proximity sensor 34 is a capacitive sensor, for example, sensing object 38 is a target suitable for being detected by a capacitive sensor, e.g., a thin metal plate or conductive area. If the bottom platen 14 is metal, inductive or capacitive sensors can sense platen 14 itself without a separate target.
- Top platen 12 also includes two microswitches 36.
- the microswitches are small limit switches that are triggered as the contact portion of tubing 16 approaches (tube closing) or leaves (tube opening) the bottom surface of the top platen 12.
- microswitches 36 operate similar to sensor array 24 discussed above, with the distance between the microswitches acting as the distance 1 of the sensor array.
- a linear variable differential transformer (LVDT), sometimes also called a linear voltage displacement transformer, may also be used to determine distance d between platens 12 and 14.
- a proximity sensor is used to sense the approach moveable platen 12 towards stationary platen 14.
- the approach may not be linear, and a somewhat non-linear signal is shown.
- the signal tends to change very little when the two platens are very close. That is, the distance changes non-linearly down to distance 24 and that remains constant between 2t and a fictitious zero distance.
- Controller 100 can therefore be configured to look for change or delta d to go to zero to determine that tubing 16 is compressed completely.
- the proximity sensor signal strength is constant to within a certain amount or percentage, the 2t distance is inferred. This pattern holds true for capacitive sensors, inductive sensors, ultrasound sensors, for example.
- a pressure sensor reading is disclosed.
- Fig. 11 depicts readings for a microswitch, which will switch on or off as desired when the tubing compresses the contact.
- FIG. 12A depicts upper and lower platens 12, 14, in which the tubing 16 is offset a distance ⁇ d to the left.
- Sensors 26a and 26b e.g., pressure sensors
- Fig. 12B shows that an array 24 of two pressure switches 26a and 26b separated by distance 1 picks up the pressure at different times.
- tubing 16 is offset to the left and the first sensor, pressure sensor 26a on the left, detects the pressure first, at a different time and distance from the pressure detected by sensor 26b on the right.
- Fig. 12A depicts upper and lower platens 12, 14, in which the tubing 16 is offset a distance ⁇ d to the left.
- Sensors 26a and 26b e.g., pressure sensors
- the real tubing contact length will be equal to 1 + ⁇ l, where 1 is the distance between the two sensors (Fig. 12A), and ⁇ l is the extra contact length caused by the time difference between the time when the first sensor on the left detects pressure and the time when the second sensor on the right detects pressure as shown in Fig. 12D.
- the extra length of tubing in contact with the platen is ⁇ l.
- the difference ⁇ d in platen distance can be measured by the difference in time from when the first and second pressure sensors detect a sharp rise in pressure.
- ⁇ l is then calculated using ⁇ d, as shown in Fig. 12D.
- the tubing diameter can be calculated.
- the change in distance ⁇ d will be inverse to the change in contact length ⁇ l.
- Infusion pump 60 includes a motor 61, a drive shaft 62, and a plurality of cam plates 63 for pressing pump rods 64 against tubing 65.
- the actuators 64 press against stationary portion 66, successively squeezing infusate from rod to rod.
- Infusion pump 60 also includes an additional cam plate 67.
- Pump controller 100 in this embodiment controls motor 61, separate cam plate 67, and receives signals from a proximity sensor 69. Under the command of a controller of the infusion pump, cam plate 67 includes a proximity sensor 69.
- proximity sensor 69 senses a target 70 in stationary portion 68, which may a portion of stationary portion 66, or may be different.
- Stationary portion 68 includes length sensor 71, for sensing a contact length of tubing 65 against stationary portion 68.
- Microprocessor controller 100 receives signals from the sensors 69, 71 and controls the motor 61, the cam plate 67, and the other portions of the infusion pump.
- Microcontroller 100 also has a memory, or has access to a memory, for a computer program on a computer-readable medium for storing the formulae discussed above and for calculating the contact length and the diameter of the tubing, as also discussed above. From these readings and calculations, controller 100 calculates a volume of a medication or infusate that has been delivered to a patient.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09744534.0A EP2373359B1 (en) | 2008-10-24 | 2009-10-19 | Infusion pump and method of in situ measuring the diameter of an infusion tube |
CN200980142196.5A CN102196832B (en) | 2008-10-24 | 2009-10-19 | Infusion pump and method of in situ measuring the diameter of an infusion tube |
MX2011004243A MX2011004243A (en) | 2008-10-24 | 2009-10-19 | Infusion pump and method of in situ measuring the diameter of an infusion tube. |
CA2739453A CA2739453A1 (en) | 2008-10-24 | 2009-10-19 | Infusion pump and method of in situ measuring the diameter of an infusion tube |
JP2011533255A JP5654997B2 (en) | 2008-10-24 | 2009-10-19 | Method for measuring the diameter of the infusion tube at the position of the infusion pump and in situ |
ES09744534.0T ES2452879T3 (en) | 2008-10-24 | 2009-10-19 | Infusion pump and in situ measurement method of the diameter of an infusion hose |
HK12101897.8A HK1161155A1 (en) | 2008-10-24 | 2012-02-24 | Infusion pump and method of in situ measuring the diameter of an infusion tube |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/258,183 | 2008-10-24 | ||
US12/258,183 US8105269B2 (en) | 2008-10-24 | 2008-10-24 | In situ tubing measurements for infusion pumps |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010048088A1 true WO2010048088A1 (en) | 2010-04-29 |
WO2010048088A4 WO2010048088A4 (en) | 2010-06-24 |
Family
ID=41682815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/061169 WO2010048088A1 (en) | 2008-10-24 | 2009-10-19 | Infusion pump and method of in situ measuring the diameter of an infusion tube |
Country Status (11)
Country | Link |
---|---|
US (2) | US8105269B2 (en) |
EP (1) | EP2373359B1 (en) |
JP (1) | JP5654997B2 (en) |
CN (1) | CN102196832B (en) |
AR (1) | AR073968A1 (en) |
CA (1) | CA2739453A1 (en) |
ES (1) | ES2452879T3 (en) |
HK (1) | HK1161155A1 (en) |
MX (1) | MX2011004243A (en) |
TW (1) | TWI543785B (en) |
WO (1) | WO2010048088A1 (en) |
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WO2013125576A1 (en) * | 2012-02-22 | 2013-08-29 | テルモ株式会社 | Medical pump |
CN103328020A (en) * | 2011-01-06 | 2013-09-25 | 康尔福盛303有限公司 | An IV pump adapted for generic tubing |
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US7008403B1 (en) * | 2002-07-19 | 2006-03-07 | Cognitive Ventures Corporation | Infusion pump and method for use |
US8517990B2 (en) | 2007-12-18 | 2013-08-27 | Hospira, Inc. | User interface improvements for medical devices |
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Also Published As
Publication number | Publication date |
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CN102196832B (en) | 2014-07-09 |
EP2373359B1 (en) | 2013-12-18 |
TW201032850A (en) | 2010-09-16 |
TWI543785B (en) | 2016-08-01 |
JP5654997B2 (en) | 2015-01-14 |
US20120130676A1 (en) | 2012-05-24 |
AR073968A1 (en) | 2010-12-15 |
US8105269B2 (en) | 2012-01-31 |
MX2011004243A (en) | 2011-05-25 |
CA2739453A1 (en) | 2010-04-29 |
US20100106082A1 (en) | 2010-04-29 |
US8496613B2 (en) | 2013-07-30 |
ES2452879T3 (en) | 2014-04-03 |
JP2012506730A (en) | 2012-03-22 |
EP2373359A1 (en) | 2011-10-12 |
CN102196832A (en) | 2011-09-21 |
WO2010048088A4 (en) | 2010-06-24 |
HK1161155A1 (en) | 2012-08-24 |
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