and is intertwined with the wire of the filter such that the ring will not be dislodged from the filter body ring 201 is shown as a tied suture tie 301 however is not connected to the filter 101 not connecting the ring 201 to the filter 101 via tie 301 allows the ring 201 to be completely removed after the ring 201 has been broken fig1 a and 10b depict a modification of the second embodiment that uses a unitary ring 201 rather than a tied suture to contain the conical end of the filter 101 the unitary ring 201 is slid over the barbed end by weaving it over and under alternating leg sets the ring is slid fully to the opposite end where it remains in position holding the conical end of the filter in the constrained position the advantage of this simple unitary ring is there is no knot that can be prone to premature failure the ring is also the lowest profile design providing minimal turbulent formation in the blood stream the ring in this design also does not have a predetermined break zone that may be prone to premature failure the ring removal device depicted in fig1 a u2013 11d will cut the ring 201 to release the filter 101 and remove it from the patient ring removal device has a hook 1103 that will act to grab the ring 201.