Tubular vascular transplant
View Patent ↗A tubular vascular transplant ( 1, 1′, 1″, 1 ′″) serves for connecting vessels in the human body. The transplant, in particular made of expanded polytetrafluoroethylene (ePTFE), can preferably be used for an arteriovenous shunt for carrying out a dialysis. The transplant is connected by its first, proximal end to a vessel, for example an artery ( 2 ), and by its distal end to another location of the same vessel or to a different vessel, for example a vein ( 3 ). The lumen of the transplant ( 1, 1′, 1 ″, and 1 ′″) widens in a steadily conical manner in the region of its distal end and forms a diffuser ( 8 ) there. The cone angle (a) of the wall of the diffuser ( 8 ) with respect to the central flow direction of the blood in the transplant ( 1′, 1″, 1 ′″) is preferably 6° to 7°. In the region of the diffuser ( 8 ), preferably at least one, preferably planar, dividing wall ( 11, 11′, 11 a , and 11 b ) is provided, running in the central flow direction of the blood. This makes it possible to prevent the formation of an intimal hyperplasia and a pseudointima.
1. A tubular vascular transplant for the connection of blood vessels in the human body, the transplant having a wall forming a lumen and having a proximal end adapted to connect with a vessel and a distal end adapted to connect with one of (a) the same vessel at a different location and (b) another vessel; wherein the lumen of the transplant widens conically in the region of said distal end and forms a diffuser, and wherein the transplant includes a first dividing wall, disposed within said lumen in the diffuser region of the transplant and extending axially in a direction of blood flow within the lumen.
2. Transplant according to claim 1 , wherein the conically widened the transplant wall in the region of the diffuser has a cone angle (α) in relation to the direction of blood flow such that dead fluid or separation zones do not, or only marginally, occur in which blood only flows very slowly.
3. Implant according to claim 2 , wherein the cone angle (α) of the diffuser is less than 10°.
4. Transplant according to claim 3 , wherein the cone angle (α) of the diffuser is in the range of 6° to 7°.
5. Transplant according to claim 2 , wherein the cone angle (α) of the diffuser is between 5° and 15°.
6. Transplant according to claim 1 , wherein the dividing wall is is fastened to one side of the transplant wall in the region of the diffuser.
7. Transplant according to claim 1 , wherein the dividing wall is straight.
8. Transplant according to claim 1 , wherein the dividing wall connects opposite sides of the transplant wall in the region of the diffuser.
9. Transplant according to claim 1 , wherein the dividing wall extends partially into the diffuser from the transplant wall.
10. Transplant according to claim 9 , wherein the dividing wall consists of two partial-dividing walls that reach into the diffuser from the transplant wall on opposite sides thereof, respectively, with an opening remaining between inside edges of the two partial-dividing walls.
11. Transplant according to claim 1 , further comprising a second dividing wall in the diffuser region arranged parallel or inclined with respect to the first dividing wall.
12. Transplant according to claim 1 , wherein a distal end region of a blood vessel with a primarily consistent diameter corresponding to the diameter at the end of the diffuser connects to the diffuser and wherein the dividing wall reaches at least partially into this end region.
13. Transplant according to claim 1 , wherein the transplant wall is made of expanded polytetrafluoroethylene.
14. Transplant according to claim 1 , which is configured as an arteriovenous shunt to carry out a dialysis.
15. Transplant according the claim 1 , wherein the dividing wall is centrally located in the lumen.