Build a Filter to identify Open Blockers of issues in the current Sprint.

[Barry Burkinshaw]

I'm trying to create a Jira board Filter to identify open issues that Block other open issues in the current Sprint.
~ If an issue WAS a Blocker but is now Done, then disregard. 
~ If an issue does not block another issue in the current Sprint, then disregard.  I'm not interested if a currently open story only blocks some issue that's not in the current Sprint. 

I expect the solution to use these terms in some fashion but have not figured out how to nest or relate them: 
1. Currently open Blockers:      issueLinkType = Blocks and statusCategory != Done
2. Issues in current Sprint:        sprint in openSprints()

Bullet 1 above successfully filters to identify open stories on the current Jira board if the open story is tagged as a Blocker to any other item. 
However, all items with a blocker relationship continue to display among the results even if the open blocked story is not in the current Sprint.  I only want to see Blockers to work in the current sprint. 

Any ideas will be appreciated.  

[Nic Brough -Adaptavist-]

Welcome to the Atlassian Community!

How are your people telling Jira that one issue blocks another?

[Barry Burkinshaw]

We use Jira's Linked issues - as Blocks, Blocked By, etc