Before you get started on more specific research you need to have some background knowledge about seniors falling, and other topics that can give you a wider picture of the topic. Read a few sources on these topics to help you learn keywords and concepts that you want to search in databases and to make sure you have some expertise on the subject before you jump into designing. There are some resources listed below to get you started but they are not an exhaustive list of topics or resources. The library catalogue and Knovel are good places to get started.

Before trying to do more specific searches, you may want to spend a little time just learning about seniors and falling. While you may have some idea about the topic or the experience, it can be good to learn a bit more about the topic you will be designing for. Below are a few books to help you get started.

You may want to do some background research on other topics such as understanding how seniors might interact with technology just so you can understand a little bit more about the population you are designing for. Below are a few resources on this topic. 

You may also want to do some general searches for existing ways in which patients are lifted just to get a general idea of the field and how things work. Below are a few articles on this topic. 

You may want to do a prior art search and have a look into information sources like patents. Try searching for something like "patient lifting device" in the library catalogue.