If you start from scratch and you want to learn designing medical instrumentation, this book will leave you wanting for much more, especially if you wish to design the electronics too. On the whole, this book can be considered a collection of monographies of dishomogeneous complexity and detail level.
For instance, the section on electronics (a measly thirty pages or so) is desperately basic and useless to conjure up any serious application. If you can design a half-decent biopotential amplifier, you don't need to read it, and if you are a medical practitioner wanting to understand more about the innards of your equipement you will find it too technical, because it looks like a copy/paste from an electronics student manual. So why bother inserting it in the first place?
The remaining sections actually do better, are more or less informative and will give you a fairly good overview of the toys of the trade. The section on biopotential and electrodes I found useful and interesting, but on the whole this book is very far from being a standalone solution, or even a reference text. Some parts will never be of interest for you, whatever your field is, and other ones require a lot of further reading.
I don't quite understand whom was it written for: it is too technical for the layman, too uneven and scattered for the student and too generic for the specialist. And the price doesn't help.