USPTO Patent Grant: Pump with telescoping action driven by friction

ChangeBridge: Patent Grants - Medical Devices (A61M)

Published March 24th, 2026

Detected March 25th, 2026

Summary

The USPTO has granted a patent (US12582765B2) to Becton, Dickinson and Company for a pump subsystem designed for fluid delivery, particularly in wearable patch pumps. The patent describes a novel pumping mechanism utilizing a telescoping action driven by friction to generate fluid movement.

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What changed

The United States Patent and Trademark Office (USPTO) has issued patent US12582765B2 for a "Pump with pumping chamber created by telescoping action driven by friction." The patent, assigned to Becton, Dickinson and Company, details a fluid delivery pump subsystem, suitable for applications like wearable patch pumps. The core innovation lies in a mechanism where linear piston movement, resisted by seal friction, creates a telescoping effect within a variable volume chamber, enabling fluid intake and discharge.

This patent grant represents a new piece of intellectual property in the field of medical fluid delivery devices. While not imposing direct compliance obligations on other entities, it signifies a technological advancement that competitors or collaborators in the medical device and pharmaceutical sectors should be aware of. Companies developing similar fluid delivery systems may need to consider this patent in their product development and freedom-to-operate analyses.

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Pump with pumping chamber created by telescoping action driven by friction

Grant US12582765B2 Kind: B2 Mar 24, 2026

Assignee

Becton, Dickinson and Company

Inventors

Alessandro Pizzochero, Mark Wood, Russell Cole

Abstract

A pump subsystem for fluid delivery (e.g., in a wearable patch pump) is provided wherein pumping action is generated by linear piston movement that pulls a plug, which is interconnected to the piston between two mechanical extremes or end stops in a telescopic or variable volume fluid chamber. Such interconnection enables piston and plug to move a certain distance with respect to each other that corresponds to a predefined swept volume of the pump subsystem. Telescoping-like effect of relative piston and plug movement provides for intake and discharge of fluid with respect to the fluid chamber. Movement of plug within piston can be enabled by the friction of seals placed on the plug, which serve to provide resistance to piston motion and therefore force translation motion of the plug to lag relative to the piston translation motion during portions of the pump cycle.