Device for fixing and positioning a cardiac pump
The present document relates to a device for fixing a cardiac pump in an opening of a ventricular wall of a beating heart. The device includes: a hollow main body of overall cylindrical shape having an outer surface, this hollow main body includes a proximal end and a distal end between which said the outer surface extends, at least one portion of the outer surface of the main body intended to be placed inside ventricular cavity, except for its distal end, has a surface relief provided with protuberances and hollows, the distal end of the hollow main body forms a smooth crown having an arithmetic average roughness of less than or equal to 1 μm in order to stop the colonization of the fixing device by endothelial cells.
1. A device, for fixing a cardiac pump in an opening of a ventricular wall of a beating heart, comprising:
a hollow main body of overall cylindrical shape having an outer surface,
this hollow main body comprising a proximal end and a distal end between which said outer surface extends, said distal end being intended to protrude from said ventricular wall inside the corresponding ventricular cavity of the beating heart,
at least one portion of the outer surface of said main body intended to be placed inside said ventricular cavity, except for its distal end, has a surface relief provided with protuberances and hollows and made of a material permitting the adherence and growth of endothelial cells, at least said portion of the outer surface comprising a coating covering a surface of titanium or of titanium alloy, and
the distal end of said hollow main body forms a smooth crown having an arithmetic average roughness of less than or equal to 1 μm in order to stop the colonization of said fixing device by endothelial cells,
wherein said hollow main body has:
a first hollow cylindrical body made entirely of titanium or of titanium alloy, wherein said first cylindrical body has, on at least part of its outer surface, said surface coating,
a second hollow cylindrical body having an external flange at its end, wherein said second cylindrical body is inserted into said first hollow cylindrical body such that its end is placed in the continuation of said outer surface of the first cylindrical body, forming a surface continuity therewith,
and wherein:
the outer surface of the portion of the external flange in contact with the first cylindrical body and the outer surface of the portion of the first cylindrical body in contact with the external flange is flush,
the rest of the outer surface of said external flange has a diameter equal to and/or less than the diameter of the outer surface of the first cylindrical body,
said end of the second cylindrical body defines the distal end of said main body,
an opening defined by the hollow main body being configured to receive a propulsive cardiac pump body,
said end of the second cylindrical body being configured to maintain in position said propulsive cardiac pump body when inserted; and
wherein said second cylindrical body is made of PEEK (polyether ether ketone) and has an entirely smooth surface with an arithmetic mean roughness Rmax of less than or equal to 1 μm, so as to prevent said second cylinder body from scratching of the propulsive cardiac pump.
2. The device according to claim 1 , in which said distal end or external flange has a longitudinal dimension of between 10 mm and 20 mm.
3. The device according to claim 1 , in which the distal end or external flange has a longitudinal dimension of between 2 mm and 10 mm.
4. The device according to claim 1 , in which an arithmetic average roughness of the coating covering the outer surface made of titanium or of a titanium alloy is between 100 μm and 300 μm.
5. The device according to claim 1 , in which the proximal end of said main body has a flared shape delimiting a seat for receiving a clamping ring to clamp annularly around the body of the cardiac pump, the inner wall of said proximal end having a first, inner thread for screwing a toothed nut.
6. The device according to claim 5 , in which an outer wall of the proximal end has a second, outer thread for receiving a ring comprising at least one lug having an orifice for receiving the end of a clamping tool.
7. The device according to claim 1 , in which the distal end of said main body is beveled in order to clamp the body of the cardiac pump inserted in said device.
8. The device according to claim 1 , in which the coating is formed solely of titanium microspheres.
9. The device according to claim 8 , in which the titanium microspheres each have a mean diameter of between 100 μm and 300 μm.
10. The device according to claim 1 , in which the coating has an open worked woven fabric formed of a plurality of polyester filaments.
11. The device according to claim 1 , in which the coating is a plasma spray.
12. The device according to claim 1 , in which the outer surface of the coating has a scoured surface state.
13. The device according to claim 1 , in which the coating has protuberances and hollows in a random distribution.