Drug Delivery Optimization Starts with Drive Mechanism Review

When embarking on the development of a new on-body drug delivery device, a multitude of factors come into play, with patient usability standing out as paramount. Central to this endeavor is the form factor of the device and its user interface, crucial elements that ensure patients can effectively operate the device to receive their therapy. At the core of drug delivery lies the motion solution, comprising the motor, gearing, feedback system, and linear delivery mechanism. Given its direct impact on the overall device geometry, collaborating with the motion supplier becomes imperative to tailor the design to suit the needs of the target patients. Let's review the key components of the motion system:

• Motor Technology. The primary motor technology selected for drug delivery applications is DC coreless motors due to their high efficiency and ability to deliver the necessary output at a low input voltage. However, depending on specific requirements such as longevity or precision, brushless DC and stepper technologies may also be considered.
• Gearing. While standard gearboxes are readily available, their ratios are often defined based on diameter, which also dictates the device's length. Optimal solutions often entail custom gearing arrangements, with the ratio tailored to the working point and the mechanical layout adapted to the device geometry.
• Linear Delivery System. Various options for leadscrews exist, offering flexibility in terms of diameter, pitch, and length. The synergy between the motor/gearing system and leadscrew ensures that both the proper dose and accuracy are met with each delivery.
• Feedback. Standard encoders that mount to the rear of the motor with varying resolutions are available. A second option involves adding a code wheel onto the motor's rear shaft that interfaces with the sensor assembly on the device's PCB.

With over four decades of expertise in motion system solutions for infusion devices, Portescap stands as a seasoned partner in device development endeavors. We look forward to working with you and ensuring that your drug delivery device achieves optimal performance and meets patient satisfaction.