# US 2014/0197824 A1 · Infusion pump

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0197824 A1
- Document ID: US20140197824A1
- Status: Published application
- Kind: A1
- Application number: 14/215,958
- Filed: 2014-03-17
- Published: 2014-07-17
- Earliest claimed: 2002-06-14
- Assignees: Baxter International Inc.
- Applicants: Baxter International Inc.
- Inventors: John Gillespie; Ralph H. LaBedz; Michael Kenneth Platt; Ronald H. Spang; James Frei Berrill; Matthew Stephen Vogel; Michelle Kowalski Greaney
- Web page: https://patentgrep.com/patent/US20140197824A1

## CPC

- A61M 5/142: Pressure infusion, e.g. using pumps
- A61M 5/14244: {adapted to be carried by the patient, e.g. portable on the body}
- A61M 5/14566: {with a replaceable reservoir for receiving a piston rod of the pump}
- A61M 5/172: electrical or electronic
- G01B 7/00: Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B 7/003: {for measuring position, not involving coordinate determination (coordinate measuring G01B7/004)}
- G06T 3/60: Rotation of whole images or parts thereof
- G16H 20/17: delivered via infusion or injection
- 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}
- A61M 2005/14208: {with a programmable infusion control system, characterised by the infusion program}
- A61M 2005/14573: {with a replaceable reservoir for quick connection/disconnection with a driving system}
- A61M 2205/21: insensitive to tilting or inclination, e.g. spill-over prevention
- A61M 2205/6054: Magnetic identification systems
- A61M 2205/8206: battery-operated
- A61M 2205/8237: Charging means
- A61M 2209/086: Docking stations
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA

## Abstract

An infusion pump includes a housing having a compartment structured to receive a syringe and a drive mechanism supported by the housing. The drive mechanism is structured and arranged to contact a syringe plunger of the syringe and move the syringe plunger within a syringe barrel of the syringe. The infusion pump further includes a syringe plunger position sensor and a syringe barrel size sensor. The sensors each include a magnet positioned on the drive mechanism and a magnetic sensor array supported by the housing.

## Claims

### Claim 1

An infusion pump comprising:
a housing including a compartment structured to receive a syringe, the syringe including a syringe barrel and a syringe plunger moveable within the syringe barrel;
a drive mechanism supported by the housing, the drive mechanism structured and arranged to contact the syringe plunger and move the syringe plunger within the syringe barrel; and
a syringe plunger position sensor including
a magnet positioned on the drive mechanism,
a magnetic sensor array supported by the housing and positioned adjacent to the magnet, the magnetic sensor array configured to generate an output indicative of a magnetic field associated with the magnet, and
software installed on the pump and configured to use the output to determine a linear position of the syringe plunger within the syringe barrel.

### Claim 2 (depends on 1)

The infusion pump of claim 1, wherein the drive mechanism includes a motor, a lead screw rotatably coupled to the motor, and a connecting linkage operably connected to the lead screw, wherein rotation of the motor causes the lead screw to rotate and move the connecting linkage to thereby move the syringe plunger within the syringe barrel, wherein the magnet is coupled to the connecting linkage.

### Claim 3 (depends on 2)

The infusion pump of claim 2, wherein the magnet is coupled to a syringe plunger engagement member of the connecting linkage.

### Claim 4 (depends on 2)

The infusion pump of claim 2, wherein the connecting linkage includes an occlusion sensor configured to determine if an infusion line connected to the syringe barrel is blocked.

### Claim 5 (depends on 4)

The infusion pump of claim 4, wherein the connecting linkage includes a plunger engagement member configured to engage an end of the syringe barrel, the plunger engagement member including the occlusion sensor.

### Claim 7 (depends on 1)

The infusion pump of claim 1, wherein the magnetic sensor array is a linear array of magnetic sensors.

### Claim 8 (depends on 1)

The infusion pump of claim 1, wherein the magnetic sensor array is configured to compensate for temperature changes.

### Claim 8 (depends on 1)

The infusion pump of claim 1, wherein the magnetic sensor array detects the orientation of magnetic field lines associated with the magnet.

### Claim 9 (depends on 1)

The infusion pump of claim 1, wherein the magnetic sensor array is configured to produce a sine wave signal to determine the linear position of the plunger within the syringe barrel.

### Claim 10 (depends on 1)

The infusion pump of claim 1, the wherein the magnetic sensor array is positioned on the housing.

### Claim 11 (depends on 1)

The infusion pump of claim 1, wherein the syringe plunger position sensor includes an electromagnetic sensor.

### Claim 12

An infusion pump operable with a syringe having a syringe barrel and a syringe plunger moveable within the syringe barrel, the infusion pump comprising:
a housing including
a compartment structured to receive the syringe and defining a wall, and
a syringe clamp moveable towards and away from the wall, the syringe contacting the syringe barrel when the syringe clamp is moved towards the wall,
a drive mechanism supported by the housing, the drive mechanism structured and arranged to contact and end of the syringe plunger so as to be able to move the syringe plunger within the syringe barrel; and
a syringe barrel size sensor including
a magnet operably coupled to the syringe clamp, and
a sensing member supported by the housing and configured to generate an output indicative of a magnetic field associated with the magnet, and
software installed on the pump and configured to use the output to determine a size of the syringe barrel received by the compartment.

### Claim 13 (depends on 12)

The infusion pump of claim 12, wherein the magnet is positioned on the syringe clamp.

### Claim 14 (depends on 12)

The infusion pump of claim 12, wherein the sensing member includes a plurality of electromagnetic sensors.

### Claim 15 (depends on 12)

The infusion pump of claim 12, wherein the sensing member includes a linear sensor array.

### Claim 16 (depends on 12)

The infusion pump of claim 12, wherein the sensing member is a single electromagnetic sensor.

### Claim 17

An infusion pump method comprising:
sensing a magnetic field associated with a first magnet coupled to a syringe clamp to determine a size of a syringe barrel received in a housing of an infusion pump; and
sensing a magnetic field associated with a second magnet to determine a linear position of a syringe plunger moveable inside the syringe barrel.

### Claim 18 (depends on 17)

The infusion pump method of claim 17, which includes linearly sensing the magnetic field associated with the first magnet to determine the size of the syringe barrel.

### Claim 19 (depends on 17)

The infusion pump method of claim 17, which includes linearly sensing the magnetic field associated with the second magnet to determine the linear position of the syringe plunger moveable inside the syringe barrel.

### Claim 20 (depends on 17)

The infusion pump method of claim 17, which includes sensing an orientation of magnetic field lines associated with (i) the first magnet and (ii) the second magnet to determine (a) the size of the syringe barrel and (b) the linear position of the syringe plunger moveable within the syringe barrel, respectively.