Usb / scsi adapters

Information required:

I have an older large format scanner which I would like to continue using. It has both a parallel port and a scsi port, which I would like to use, if possible.

I am unable to find a currently available usb to scsi adapter for my laptop Suggestions appreciated!

Thanks.
EF13

http://www.buy.com/prod/ratoc-usb2-0-to-ultra-scsi-converter-50-pin-d-sub-hd-50-male-to-type-a/q/loc/101/202270246.html

This model is available at a lot of online stores, including Amazon.
Hope it is the type of scsi connector you need.