Liquid Flow Sensor LD20

Single-use Flow Sensor for Biomedical Applications

Safe, precise, and reliable measurement of low flow rates in medical environment has never been so easy: The single-use liquid flow sensors of the LD20 series measure the liquid flow rate directly and at the point of interest for a more effective patient treatment and improved safety.

Nowadays, keywords and trends such as point-of-care, patient compliance, complex drug administering, and wearable designs demand the development of smart medical devices. The LD20 series combines Sensirion’s proven liquid flow sensing technology with a single-use, cost-optimized design for high volume applications in the medical, life-science or food industry. The sensor provides a bidirectional measurement of flow rates from 1300 ml/h down to single-digit ml/h, while it as well reliably detects common failure modes such as occlusion, free flow, or air bubbles with unprecedented speed and sensitivity.

The LD20 series optimizes costs by reducing the flow sensor to its bare minimum while still ensuring easy fluidic, electrical and mechanical connections. Barbed or luer lock fittings guarantee secure and straight-forward integration into the fluidic line: for example, into a catheter or an infusion set. Inert wetted materials provide outstanding chemical resistance and excellent media compatibility.

When using a sensor of the LD20 series, drug delivery can be measured precisely and in real time. Consequentially, drug therapies become more effective, as they become easier to monitor and control. The LD20 liquid flow sensor series enables medical device manufacturers to enhance the safety, performance, and reliability of their products for the benefit of patients and care givers.

Features

Maximum flow rate for water-based liquids: 1300 ml/h

Bidirectional measurement and real time failure detection

Highest sensitivity for detection of infiltration and multi-infusion settings

Media isolation: No contact of the sensor chip with valuable medications or body fluids

High speed measurement: Response time < 50 ms

Low power consumption: Suitable for battery-powered applications

Highly integrated: Fully calibrated, linearized, and temperature compensated digital I²C signal from a single chip

Highly scalable sensor design: Competitive pricing for single-use applications

Applications

Biomedical devices

Infusion therapy

(Wearable) drug delivery devices

Urine catheters

Surgical instruments

Bioreactors

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Sensirion sensor + Fraunhofer micropump = A miniaturized smart drug delivery module

Sensirion and the Fraunhofer Research Institution for Microsystems and Solid State Technologies (EMFT) is presenting an innovative concept study in the field of medical technology.

Fraunhofer EMFT’s silicon micropump has been combined with Sensirion’s LD20 disposable liquid flow sensor as part of a joint project with the aim of developing a smart and cost-efficient miniaturized module for controlled and monitored drug delivery. This highly integrated single-use drug delivery module measures a mere 35 x 15 x 5 mm3.

Advanced Failure Detection of the LD20 Series

Due to Sensirion’s unique CMOSens ® Technology, the LD20 liquid flow sensor is sensitive enough to detect the smallest changes in the flow rate. For instance, when integrated into an infusion set, it is so sensitive that it can detect the regular peaks in the infusion flow rate produced by the oscillating back pressure of the patient’s venous pulse – the sensor can feel the patient’s heartbeat.

Detecting the heartbeat on the flow rate is a direct indication of an intact connection of the infusion cannula to the vein of the patient, absence of the pulsation on the contrary indicates an interrupted connection. Possible causes may include e.g. kinked, disconnected or, ruptured tubing or a dislodged infusion cannula which may in turn lead to infiltration. By evaluating the sensor signal, Sensirion’s sensor solution offers a unique possibility of detecting infiltration quickly and preventing harmful consequences to the patient.