System and method for improved low flow medical pump delivery
First Claim
1. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
- determining a cycle start position;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values over time using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
calculating the rate of change of the sensed force/pressure values;
determining in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, determining in a second determination step whether the rate of change of the sensed force/pressure values meets a second rate of change value;
if the second determination step is true, calculating a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle; and
, completing the effective pump cycle delivery using the remaining pump drive travel value.
6 Assignments
0 Petitions
Accused Products
Abstract
A medical pump with an improved continuity low flow delivery system and method for use with a pumping chamber, for example in a cassette, is disclosed. The pump includes a pump drive for exerting a force on the pumping chamber and a sensor for sensing the force/pressure exerted by the pump drive on the pumping chamber. The pump drive position sensor senses the position of the pump drive. The medical pump also includes a processing unit and a memory having a programming code adapted to calculate the rate of change of the sensed force/pressure values and determine whether the rate of change of the sensed force/pressure values meets a rate of change threshold. Once the rate of change threshold is met, the programming code is adapted to calculate a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle. The programming code is further adapted to trigger one or more signals to drive the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value.
-
Citations
41 Claims
-
1. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
-
determining a cycle start position;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values over time using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
calculating the rate of change of the sensed force/pressure values;
determining in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, determining in a second determination step whether the rate of change of the sensed force/pressure values meets a second rate of change value;
if the second determination step is true, calculating a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle; and
,completing the effective pump cycle delivery using the remaining pump drive travel value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
-
-
18. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
-
determining a cycle start position;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values over time using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
determining whether a predetermined initial travel value has been met in relation to the cycle start position;
calculating the rate of change of the sensed force/pressure values;
if the rate of change of the sensed force/pressure values is less than the threshold rate of change value, calculating a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle;
preventing at least one of the following steps until a predetermined initial travel value has been met;
a) sensing the plurality of force/pressure values;
b) calculating the rate of change of the sensed force/pressure values;
determining whether the rate of change of the sensed force/pressure values is less than a threshold rate of change value; and
/or,c) calculating the remaining pump drive travel value; and
,completing the effective pump cycle delivery using the remaining pump drive travel value.
-
-
20. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
-
determining a cycle start position;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
calculating the rate of change of the sensed force/pressure values;
determining whether the rate of change of the sensed force/pressure values has met a threshold rate of change value;
if the rate of change of the sensed force/pressure values has met the threshold rate of change value, then at least one of determining whether a predetermined further travel value has been met and/or driving the pump drive based on the predetermined further travel value;
if the predetermined further travel value has been met and/or fulfilled, then calculating a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle; and
,completing the effective pump cycle delivery using the remaining pump drive travel value.
-
-
21. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
-
determining a delivery cycle start position;
determining the amount of a substance remaining to be delivered;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values over a travel distance using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
determining the rate of change of the sensed force/pressure values over the travel distance;
determining in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, determining whether the amount of the substance remaining to be delivered has changed; and
,if the amount of the substance remaining to be delivered has changed more than a change threshold, completing the delivery cycle. - View Dependent Claims (22, 23, 24, 25)
-
-
26. A method for providing low flow continuity of a medical pump having a pump drive and a force/pressure sensor, comprising the steps of:
-
determining a cycle start position;
driving the pump drive at a drive rate which is based on a desired delivery rate;
sensing a plurality of force/pressure values using the force/pressure sensor, which are representative of the force/pressure exerted on the force/pressure sensor as the driving of the pump drive occurs;
determining a delivery start position by calculating the rate of change of the sensed force/pressure values and determining the delivery start position when a rate of change threshold has been met;
calculating the remaining pump drive travel value in relation to the delivery start position, comprising the steps of;
receiving an effective cycle travel value;
determining an already traveled cycle value based on the delivery start position; and
,subtracting the already traveled cycle value from the effective cycle travel value; and
,driving the pump drive using the remaining pump drive travel value.
-
-
27. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
calculate the rate of change of the sensed force/pressure values over time;
determine in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, determine in a second determination step whether the rate of change of the sensed force/pressure values meets than a second rate of change value;
if the second determination step is true, calculate a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle; and
,trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value. - View Dependent Claims (28, 29, 30, 31, 32, 33)
-
-
34. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
determine a cycle start position;
calculate the rate of change of the sensed force/pressure values;
determine whether a predetermined initial travel value has been met in relation to the cycle start position;
prevent at least one of the following steps until the predetermined initial travel value has been met;
a) sense the plurality of force/pressure values; and
/or,b) calculate the rate of change of the sensed force/pressure values;
determine whether the rate of change of the sensed force/pressure values is less than a threshold rate of change value;
if the rate of change of the sensed force/pressure values is less than the threshold rate of change value, calculate a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle; and
,trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value.
-
-
35. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
determine a cycle start position;
calculate the rate of change of the sensed force/pressure values;
determine whether the rate of change of the sensed force/pressure values has met a threshold rate of change value;
if the rate of change of the sensed force/pressure values has met the threshold rate of change value, then at least one of determine whether a predetermined further travel value has been met and/or drive the pump drive based on the predetermined further travel value;
if the predetermined further travel value has been met or fulfilled, then calculate a remaining pump drive travel value in order to determine how much farther the pump drive should travel before the end of an effective pump cycle; and
,trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value.
-
-
36. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
receive a delivery cycle start position;
determine the amount of the substance remaining to be delivered;
determine the rate of change of the sensed force/pressure values over the travel distance;
determine in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, determine whether the amount of the substance remaining to be delivered has changed; and
,if the amount of the substance remaining to be delivered has changed more than a change threshold, trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value.
-
-
37. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
receive a cycle start position;
determine a delivery start position by calculating the rate of change of the sensed force/pressure values and determine the delivery start position when a rate of change threshold has been met;
calculate the remaining pump drive travel value in relation to the delivery start position, comprising the steps of;
receive an effective cycle travel value representative of an effective cycle travel;
determine an already traveled cycle value based on the delivery start position; and
,subtract the already traveled cycle value from the effective cycle travel value; and
,trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective cycle travel using the remaining pump drive travel value.
-
-
38. A medical pump for low flow delivery of a substance, for use with a pumping chamber, comprising:
-
a pump drive for exerting a force on the pumping chamber;
a sensor operatively associated with the pump drive for sensing the force/pressure exerted by the pump drive on the pumping chamber;
a pump drive position sensor operatively connected to the pump drive for sensing the position of the pump drive;
a processor in electronic communication with the pump drive, the force/pressure sensor, and the pump drive position sensor;
a memory in electronic communication with the processor, wherein the memory comprises programming code for execution by the processor, and wherein the programming code is adapted to;
calculate the rate of change of the sensed force/pressure values;
determine in a first determination step whether the rate of change of the sensed force/pressure values meets a first rate of change value;
if the first determination step is true, at least one of calculate a remaining pump drive travel value and/or determine whether the amount of the substance remaining to be delivered has changed; and
,trigger a plurality of pump drive signals for driving the pump drive for the remainder of the effective pump cycle. - View Dependent Claims (39, 40, 41)
-
Specification