LD20 Disposable Liquid Flow Sensors for Biomedical Applications

Safe, precise, and reliable measurement of low flow rates in medical environment has never been so easy: The disposable 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 disposable, 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 1200 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. Standard 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.

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.