Sites:
Home > Technical Library > Motion and Controls > Motors > Selecting Miniature Motors for your Medical Device (.pdf)

Selecting Miniature Motors for your Medical Device

From Portescap

The creation of small, portable infusion pumps opened a new chapter in medical care. A patient can receive carefully metered and timed doses of medicine, without requiring a visit to the medical practitioner, allowing life to be less restrictive. Ambulatory pumps have been developed to deliver insulin, nutritive supplements and anticancer drugs.

Medical equipment such as this demands extremely high reliability - any failure obviously being unacceptable - so during the design phase it's important to take into account the complete system: the pump itself, the motor, the driver, the feedback, etc. Miniaturization is crucial, for convenience to the user, especially with portable equipment. The patient should not be disturbed by the pump noise, either at rest or in social surroundings. For this reason, portable batterypowered pumps need a very efficient and quiet motor. When choosing a DC motor type, there are numerous advantages and disadvantages depending on which technology you choose, whether it be Brush DC, Brushless DC, or Stepper technologies.

In this paper, we will use a small syringe pump as an example. A typical design, illustrated below, is a piston moved by a lead screw, the screw or the nut driven with a micro-motor.

Read the Whole Article
Products & Services
Gearmotors
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head typically used to adjust the motor's output speed and torque.
DC Motors
DC motors are most commonly used in variable speed and torque applications. They include brushless and gear motors, as well as servomotors.
Brushless Motors
Brushless motors are synchronous electric motors that have a magnetically (AC induction) or electronically (DC) controlled commutation system instead of a brush-based mechanical commutation system.
DC Servomotors
DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors.
Product Announcements
Haydon Kerk Motion Solutions, Inc. - Custom Mini Lead Screw Critical to Insulin Pump
In order to deliver a patient's measured insulin dose precisely and repeatedly, the Deltec Cozmo® Insulin Pump's small size required an innovative approach. Haydon Kerk Motion Solutions, Inc. designed... (read more)
Buehler Motor, Inc. - Drive unit for insulin delivery
Your idea – our drive. Your ideas and requirements are what motivates us. The following projects illustrate how Bühler Motor’s combined development, system and production capabilities... (read more)
CyPower, LLC - Medically Approved Power Supplies
CyPower carries the top Manufacturers of Medically approved power supplies from Emerson Network Power, TDK Lambda, SynQor, Excelsys, Cosel and many others. These power supplies built to the... (read more)
Hamilton Co. - Syringe Pumps
Syringe Pumps from Hamilton Company. When fluid handling is required for your instrumentation, let Hamilton Company help. A number of companies have relied on us to provide the best solution, and time... (read more)
Buehler Motor, Inc. - Bühler Motor - Ambient Assisted Living Solutions
With exceptional process and methodology competence, Bühler Motor is the ideal development partner for complete solutions - ranging from prototypes and short-run production of several hundred... (read more)
Parker Hannifin / Automation / Precision Fluidics Division - More Efficient Miniature Diaphragm Pump
Need a More Efficient Miniature Diaphragm Pump than Existing Designs?... (read more)
KNF Neuberger, Inc. - DC Powered Pumps for Air and Gases
KNF's air, gas & liquid diaphragm DC & BLDC powered pumps are now available from .25 LPM to 38 LPM (1.3 CFM) capacity. They provide oil-free, reliable operation over their lifetime. Evaluation... (read more)
KNF Neuberger, Inc. - Miniature Diaphragm Pump of 316SS, Aluminum
Using KNF's extensive experience with motors, materials and pump design, we have created one of our micro-size diaphragm pumps, NMP015, in 316 stainless steel and aluminum heads. This design improves... (read more)
KNF Neuberger, Inc. - BLDC Diaphragm Pump has High Flow and Low Vacuum
KNF's latest oil-free diaphragm pump, the Model N940.5APP features excellent suction speed at low absolute pressures in a compact, 4-stage package. A series of technical innovations include a... (read more)
 
Topics of Interest

Rietschle Thomas is a global leader in the production of compressors and pumps for global OEM, end-user, and engineered systems applications. They selected a ThinGap brushless part-set to power the...

Develop a drive unit for precisely metered delivery of the insulin to the patient via a micropump.

Viewing Flow Management as a Critical Subsystem of Devices From infusion pumps to valves and IV sets, flow-control systems are providing new capabilities in care while helping to ensure patient...

Advantages of Lithium-Ion Battery Power for Portable Medical Equipment A higher-energy-density technology can deliver more power than alternatives despite a smaller footprint. Medical equipment...

Unlike piston pumps, miniature diaphragm pumps do not require lubricants in the pump’s stroking mechanism. On a similar note, rotary-vane pumps are prone to the vanes wearing and spewing debris...