SQL & PL/SQL

I'm trying to create the following procedure and I'm getting a compile error: PL/SQL: ORA-00904: "CASE_ID": invalid identifier.
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/* update Patient ID matched from case number */
Create or replace procedure update_Case_with_Patient_ID AS

cursor case_new is
select * from v_case_staff_model
;
type v1_type is table of case_new%rowtype; /* create a type for v */
v v1_type; /* identify v as the type */

begin
open case_new;

loop

fetch case_new bulk collect into v limit 1000;

FOR indx IN 1..v.COUNT
loop

Update t_case set patient_id = v.patient_id
where case_id(indx) = t_case.case_id;

end loop;
exit when v%notfound;
end loop;
end;
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case_new, from the view, has two fields; case_id and patient_id. The error is generated in the where clause of the upate on "case_id(indx)".

I've spent the morning looking at various syntax structures and the above seemed to be the closest to what I want.

Suggestions?

tia
Chris