Occlusion detection

• US 10,004,847 B2
• Filed: 05/23/2013
• Issued: 06/26/2018
• Est. Priority Date: 05/25/2012
• Status: Active Grant

• Current Assignee: Smiths Medical ASD, Inc. (Smiths Group International Holdings Ltd.)
• Original Assignee: Smiths Medical ASD, Inc. (Smiths Group International Holdings Ltd.)
• Inventors: Wander, Jacob A., Adams, Grant A., Lacy, Christopher A.
• Primary Examiner(s): BERDICHEVSKY, AARTI
• Application Number:
  US14/400,509
• Publication Number:
  US 20150133890A1
• Time in Patent Office: 1,860 Days
• CPC Class Codes: A61B 2560/0266 for monitoring or limiting apparatus function
• CPC Class Codes: A61B 5/4839 combined with drug delivery
• CPC Class Codes: A61M 2005/16863 Occlusion detection
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066

Abstract

A system for occlusion detection could include a syringe pump for a syringe containing a medication, wherein the syringe includes a plunger and the syringe pump includes a plunger driver. A bendable element could be integrally formed with the plunger driver, and a force sensor could also be integrally formed with the plunger driver. Upon occurrence of an occlusion, the plunger would exert a force backwardly against the bendable element, thereby deflecting the bendable element into contact with the force sensor to thereby generate a signal indicating the occurrence of the occlusion.

Claims

1. A system for occlusion detection, comprising:

a syringe pump capable of accommodating a range of syringe diameters, said syringe pump including a plunger driver configured to apply a force to forwardly push a plunger within a barrel of a syringe loaded into said syringe pump;

a bendable element integrally formed with said plunger driver, said bendable element defining a moment arm between a bending point and a center of said force applied to said plunger, wherein said moment arm correspondingly increases with a decrease in a diameter of said syringe; and

a force sensor integrally formed with said plunger driver, wherein upon occurrence of an occlusion, said plunger exerts a force backwardly against said bendable element, thereby deflecting said bendable element into contact with said force sensor to thereby generate a signal indicating the occurrence of the occlusion, and wherein a force applied to said force sensor remains acceptable for proper detection and operation of the sensor when a syringe having a relatively small diameter is loaded into said syringe pump, due to occurrence of a correspondingly greater moment arm on said bendable element that is attributable to the relatively small diameter of the syringe.

2. The system for occlusion detection of claim 1 characterized in that forces exerted backwardly against said bendable element resulting from occurrences of occlusions, acting on said force sensor, increase in magnitude as syringe sizes decrease due to correspondingly greater moment arms on said bendable element.

3. A system for occlusion detection, comprising:

a syringe pump capable of accommodating a range of syringe diameters, said syringe pump including a plunger driver configured to apply a force to forwardly push a plunger within a barrel of a syringe loaded into said syringe pump; and

a substantially unitary, combination component of a bendable element with a force sensor, being integrally formed with said plunger driver, said bendable element defining a moment arm between a bending point and a center of said force applied to said plunger, wherein said moment arm correspondingly increases with a decrease in a diameter of said syringe, wherein upon occurrence of an occlusion, said plunger exerts a force backwardly against said combination component, thereby deflecting said combination component such that a signal is thereby generated to indicate the occurrence of the occlusion, and wherein a force applied to said force sensor remains acceptable for proper detection and operation of the sensor when a syringe having a relatively small diameter is loaded into said syringe pump, due to occurrence of a correspondingly greater moment arm on said bendable element that is attributable to the relatively small diameter of the syringe.

4. The system for occlusion detection of claim 3, characterized in that forces exerted backwardly against said combination component resulting from occurrences of occlusions, acting on said combination component, increase in magnitude as syringe sizes decrease due to correspondingly greater moment arms on said combination component.

5. A method of occlusion detection, comprising:

providing a syringe pump capable of accommodating a range of syringe diameters, said syringe pump including (i) a plunger driver configured to apply a force to forwardly push a plunger within a barrel of a syringe loaded into said syringe pump, (ii) an element with said plunger driver, said element being a bendable element defining a moment arm between a bending point and a center of said force applied to said plunger, wherein said moment arm correspondingly increases with a decrease in a diameter of said syringe, and (iii) a force sensor integrally formed with said plunger driver, wherein upon occurrence of an occlusion, said plunger exerts a force backwardly against said element, thereby deflecting said element into contact with said force sensor to thereby generate a signal indicating the occurrence of the occlusion, and wherein a force applied to said force sensor remains acceptable for proper detection and operation of the sensor when a syringe having a relatively small diameter is loaded into said syringe pump, due to occurrence of a correspondingly greater moment arm on said bendable element that is attributable to the relatively small diameter of the syringe;

administering the medication to a patient by way of said syringe pump; and

sending said signal generated by said sensor to medical staff, upon an occurrence of an occlusion.

6. A method of occlusion detection, comprising:

providing a syringe pump capable of accommodating a range of syringe diameters, said syringe pump including (i) a plunger driver configured to apply a force to forwardly push a plunger within a barrel of a syringe loaded into said syringe pump and (ii) a substantially unitary, combination component of a bendable element with a force sensor, with said plunger driver, said bendable element defining a moment arm between a bending point and a center of said force applied to said plunger, wherein said moment arm correspondingly increases with a decrease in a diameter of said syringe, wherein upon occurrence of an occlusion, the plunger exerts a force backwardly against said combination component, thereby deflecting said combination component such that a signal is thereby generated to indicate the occurrence of the occlusion, and wherein a force applied to said force sensor remains acceptable for proper detection and operation of the sensor when a syringe having a relatively small diameter is loaded into said syringe pump, due to occurrence of a correspondingly greater moment arm on said bendable element that is attributable to the relatively small diameter of the syringe;

administering the medication to a patient by way of said syringe pump; and

sending said signal generated by said combination component to medical staff, upon an occurrence of an occlusion.