In the first two chapters of this book there is information about the needs and potential applications of indwelling transducers both present and past, and will go into detail about many topics such as the fundaments of blood pressure transducers, studies of the intestinal motility and clinical aspects of cardiovascular pressure measurements. Chapters 3, 4 & 5 explain and give information on manufacturers considerations of indwelling pressure transducer, specifications of commercial pressure transducers. Research and development of indwelling pressure transducer, explaining the principles of pressure transducer, biomedical applications. And then they move onto future directions for implant pressure transducers and the users point of view. This book covers a wide spectrum on indwelling pressure transducers.