Micro oxygen sensors designed for all research applications were a small tip size and a fast response time (<3 sec) is necessary.
Needle-type oxygen microsensors are ideal for animal physiology and for oxygen distribution profiling in sediments or biofilms with micro-manipulators for high spatial resolution. The oxygen-sensitive tip of an optical fiber is protected inside a stainless-steel needle. This design allows for easy penetration through a rubber septum or any other harsh material as well as for transportation.
Implantable oxygen microsensors are miniaturized fiber-optic sensors that has no housing so you can mount/insert it through canulae, catheters, syringe needles etc. for in-vivo measurements in the blood circuit of living animals or liquid circuits of trees.