Inclusion Criteria (Implant Group):
- The patient is at high risk for pulmonary embolism and is under consideration for placement of a permanent IVC filter.
- The Patient or guardian must have given informed consent.
- The Patient must agree to return for clinical imaging follow-up at 1, 3, 6, and 12 months.
Inclusion Criteria (Retrieval Group):
- The patient is at high risk for pulmonary embolism and is under consideration for placement of a permanent or short-term IVC filter.
- The patient must have a patent internal jugular vein.
- The Patient or guardian must have given informed consent.
- The patient must agree to have a clinical and imaging examination performed prior to filter retrieval.
- The patient must agree to return for clinical and imaging follow-up at 30 days and 3 months after filter retrieval.
Exclusion Criteria (Implant Group):
- The Patient is less than 18 years of age.
- The patient is pregnant.
- The patient has uncontrollable coagulopathy.
- The patient has a life expectancy less than 6 months.
- The patient has a vena cava diameter over 30 mm, measured by vena cava sizing catheters.
- The patient's vena cava diameter is less than 15 mm, measured by vena cava sizing catheters.
- The patient has a contrast allergy that can not be adequately pre-medicated.
- The patient is simultaneously participating in another investigative drug or device study, or has a previous IVC filter
Exclusion Criteria (Retrieval Group):
- The Patient is less than 18 years of age.
- The patient is pregnant.
- The patient has uncontrollable coagulopathy.
- The patient has a life expectancy less than 6 months.
- The patient has a vena cava diameter over 30 mm, measured by vena cava sizing catheters.
- The patient's vena cava diameter is less than 15 mm, measured by vena cava sizing catheters.
- The patient has a contrast allergy that can not be adequately pre-medicated.
- The patient is simultaneously participating in another investigative drug or device study, or has a previous IVC filter