Light and compact dialysis and infusion pumps made with ASPINA medical servo motor system

In recent years, there has been an increasing need for new dialysis machines and medical infusion pumps – more quiet, more compact, lighter weight, and lower power consumption.

Infusion pumps are being used in a variety of new applications (e.g. new chemotherapy treatments), where there is also a need for high-resolution control of the infusion volume and portability to allow the patient to move around while undergoing treatment.

One of the most important keys to designing quiet, compact, lightweight, and power efficient dialysis machines and infusion pumps is the selection of the motor that drives the pump head with rollers or fingers to compress the tubing.

When developing battery-powered dialysis machines and infusion pumps, low power consumption is always a concern. Since the motor in the machine accounts for a large part of the power consumption of the entire machine, a motor should be selected that minimizes the power consumption.

Sometimes it is challenging for design teams developing a new dialysis machine or infusion pump to select the best motor. They do not have enough detailed information and knowledge about motor types, mechanisms, products, etc. Or perhaps, they do not have enough time to evaluate and select a suitable motor for the machine due to the limited development period and man-hours.

ASPINA proposes servo motor system for medical applications to develop quiet, compact, and efficient dialysis machines and infusion pumps.

Besides achieving higher efficiency due to eliminating the need for a gearbox, we are also able to achieve higher efficiency by driving the stepper motor via vector control (FOC: field-oriented control). This allows the motor to generate higher torque without stalling and produces less unnecessary current dissipation because the current output is adjusted according to the required load level, unlike stepper motors driven via a regular drive controller.

Current consumption (orange) and torque (red) of ASPINA servo motor systems

The servo motor system generates less heat, contributing to flexible mechanical design for heat dissipation inside the machine. We have tested it with infusion pumps and the temperature rise was less than half that of conventional products for a given load level.

ASPINA, a world leader in hybrid stepper motors, apply stepper motors proven in medical devices to this servo motor system. We can also supply our products in conformity with the quality and safety standards of medical devices depending on customer needs.

Motor size (□28 - 60 mm) for ASPINA’s servo motor system for medical applications can be selected according to required flow rate. Both integrated and separate driver types are available, allowing customers flexibility when designing the housing of the machines.

ASPINA can develop and supply integrated modules that may include motor, rollers, and cams reducing time and cost for customers to develop and manufacture dialysis machines and infusion pumps.

As a partner in medical device development, ASPINA will help our customers grow their business.