Granted Patent B2

US 12,396,837 · App. 16/877,259 · Granted Aug 26, 2025

Inventors: Zeke Eller (Plano, TX); John William Hall (North Salt Lake, UT); Robert S. Kellar (Flagstaff, AZ); Rachel Lynn Simmons (Bountitul, UT); Robert J. Radford (Freemont, CA); Bart Dolmatch (Dallas, TX)

Assignee: Merit Medical Systems, Inc.

A61F2/06A61F2/07A61F2/82A61F2/88A61L31/10A61L31/146B32B27/322D01D5/0007D01D5/003D01D5/0038D01D5/0046D01D5/0084A61F2002/072A61F2/89A61F2/915

Abstract

Claims (39)

1. A vascular prosthesis, comprising:

a scaffolding structure configured to resist radial compression when disposed in a lumen of a patient, and

a coating disposed on at least a portion of the scaffolding structure, the coating comprising a first layer of polytetrafluoroethylene (PTFE), a non-porous tie layer coupled to the first layer, and a second layer of porous PTFE,

wherein the non-porous tie layer is impervious to tissue growth into the non-porous tie layer, and

wherein portions of the tie layer are disposed within pores of the second layer.

2. The vascular prosthesis of claim 1 , wherein:

the first layer comprises serially deposited PTFE fibers.

3. The vascular prosthesis of claim 2 , wherein the serially deposited PTFE fibers are electrospun PTFE fibers.

4. The vascular prosthesis of claim 1 , wherein the first layer is permeable to tissue growth into the first layer.

5. The vascular prosthesis of claim 1 , wherein the first layer defines a luminal surface of the vascular prosthesis.

6. The vascular prosthesis of claim 1 , wherein the tie layer is non-fibrous.

7. The vascular prosthesis of claim 2 , wherein the second layer is permeable to tissue growth into the second layer.

8. The vascular prosthesis of claim 2 , wherein the second layer comprises serially deposited PTFE fibers.

9. The vascular prosthesis of claim 2 , wherein the second layer comprises electrospun PTFE fibers.

10. A medical appliance, comprising:

a scaffolding structure comprising a single wire; and

a coating disposed on at least a portion of the scaffolding structure, the coating comprising:

a first layer of electrospun PTFE fibers;

a tie layer of fluorinated ethylene propylene (FEP) film coupled to the first layer; and

a second layer of porous PTFE,

wherein the tie layer is non-porous, and

wherein portions of the tie layer is disposed within pores of the second layer of porous PTFE.

11. The medical appliance of claim 10 , wherein the first layer defines a luminal surface of the medical appliance.

12. The medical appliance of claim 10 , wherein the first layer is permeable to tissue growth into the first layer.

13. The medical appliance of claim 10 , wherein the tie layer is impervious to tissue growth into the tie layer.

14. The medical appliance of claim 10 , wherein the tie layer is non-fibrous.

15. The medical appliance of claim 10 , wherein the second layer comprises electrospun PTFE fibers.

16. A medical stent, comprising:

a scaffolding structure comprising a wave configuration; and

a coating disposed on at least a portion of the scaffolding structure, the coating comprising:

an inner layer of electrospun PTFE fibers;

a tie layer of FEP film coupled to the inner layer and impervious to tissue growth into the tie layer; and

an outer layer of electrospun PTFE fibers,

wherein the tie layer is non-porous, and

wherein portions of the tie layer is disposed within pores of the outer layer of electrospun PTFE.

17. The medical stent of claim 16 , wherein the inner layer defines a luminal surface of the medical stent.

18. The medical stent of claim 16 , wherein the inner layer is permeable to tissue growth into the inner layer.

19. The medical stent of claim 16 , wherein the tie layer is non-fibrous.

20. The medical stent of claim 16 , wherein the outer layer is permeable to tissue growth into the outer layer.

Assignments (2)

Continuity (3)

References Cited (400)