Cannula for minimally invasive surgical tricuspid valve repair

Abstract

A cannula for minimally invasive surgical tricuspid valve repair, constituted by two coaxial tubesan outer short one (2) and an inner long one (3), of which the inner long tube (3) is slidably movable relative to the outer short tube (2), and its proximal end is constituted by a head (4) which in the folded position has a cone shape with an axial inlet hole (5) in the axis of the upper base, while in the unfolded position, with the outer short tube (2) slid off in the distal direction, the head (4) has the shape of a cup extending outwardly. The outer edge of the cup has a diameter about three times the inner diameter of the cannula (1). The outer short tube (2) is equipped with at least one rigid tie rod (8) the free end of which extends along the inner wall of the inner long tube (3) beyond its distal end.

Claims

1. A cannula for minimally invasive surgical tricuspid valve repair, which is constituted by at least one flexible tube equipped with a connector, characterised in that the cannula (1) is formed by two coaxial tubesan outer short one (2) and an inner long one (3), of which the inner long tube (3) is slidably movable relative to the outer short tube (2), and its proximal distal end is constituted by a head (4) which in the folded position has a cone shape with an axial inlet hole (5) in the axis of the upper base, while in the unfolded position, with the outer short tube (2) slid off in the proximaldistal direction, the head (4) has the shape of a cup extending outwardly the outer edge of which has a diameter about three times the inner diameter of the cannula (1), and the outer short tube (2) is equipped with at least one rigid tie rod (8) the free end of which extends along the inner wall of the inner long tube (3) beyond its distal proximal end.

2. The cannula according to claim 1, characterised in that the head (4) of the cannula (1) is made of a resilient and stretchable material.

3. The cannula according to claim 2, characterised in that the head (4) of the cannula (1) is made of silicone.

4. The cannula according to claim 1, characterised in that the diameter of the hole (5) constitutes from 50 to 75% of the outer diameter of the cannula (1).

5. The cannula according to claim 1, characterised in that the head (4) is equipped, from the inside, with an openwork resilient frame (6) attached to the upper edge of the head (4).

6. The cannula according to claim 5, characterised in that the frame (6) of the cannula (4) is made of a thin, resilient metal wire or plastic resistant to external conditions.

7. The cannula according to claim 5, characterised in that components of the frame (6) are bent in the shape of triangles the vertices of which are freely disposed inside the inner long tube (3).

8. The cannula according to claim 1, characterised in that the inner long tube (3) has, below the head (4), at least one longitudinal through hole (7).

9. The cannula according to claim 1, characterised in that on a central section having a length of 10 to 20% of the total length of the inner long tube (3), there are transverse holes (9) in the walls, evenly spaced around its circumference.

Description

THE BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS

[0020] The object of the solution is presented in an embodiment in the drawing, where

[0021] FIG. 1 shows the cannula with its head opened in a side view;

[0022] FIG. 2 shows a vertical section of the cannula with its head opened;

[0023] FIG. 3 shows an axonometric view of the cannula with its head opened;

[0024] FIG. 4 shows a half-view-half-section of the cannula with its head opened;

[0025] FIG. 5 shows a half-view-half-section of the cannula with its head opened and the frame;

[0026] FIG. 6 shows a side view of the cannula with its head closed;

[0027] FIG. 7 shows a cross-section of the cannula with its head closed and the frame.

EXAMPLE I

[0028] The cannula is formed by two coaxial tubesan outer short one 2 and an inner long one 3, of which the inner long tube 3 is slidably movable relative to the outer short tube 2. The proximal distal end of the cannula 1 is constituted by a head 4 which in the folded position has a cone shape with an axial hole 5 in the axis of the upper base. The diameter of the hole 5 is proportional to the inner diameter of the cannula and constitutes 60% of the outer diameter of the cannula 1, thanks to which it ensures free blood flow into the cannula 1. In the unfolded position, with the outer short tube 2 slid off in the distal proximal direction, the head 4 has the shape of a cup extending outwardly the outer edge of which has a diameter three times the inner diameter of the cannula. The head 4 of the cannula 1 is made of a resilient and stretchable material. On a central section of the inner long tube 3, having a length of 10 to 20%, there are transverse holes 9 in the walls, evenly spaced around its circumference. The inner short tube 2 has two rigid tie rods 8 the free ends of which equipped with ergonomic handles through longitudinal through holes 7 are introduced to the interior of the cannula 1, and then are guided along walls beyond its distal proximal end.

[0029] The cannula 1 with its head 4 closed is introduced into the femoral vein, then, having reached the heart, the right vestibule is passed, and the head 4 of the cannula is placed in the superior vena cava. Then, by pulling the tie rods 8, the outer short tube 2 is pulled down below the head 4 in order to reveal it in its entirety. Then, flexible and resilient walls of the head 4 expand and develop into a cup the upper wall parts of which adhere to the inner walls of the vein, thereby preventing the flow of blood along the outer walls of the cannula 1. A connector, located at the distal proximal end of the cannula, is connected to the apparatus providing extracorporeal circulation. After surgery, the outer short tube 2 is slid back towards the head 4, thereby leading to its closure, then the cannula 1 is removed from the vein.

EXAMPLE II

[0030] The cannula is formed by two coaxial tubesan outer short one 2 and an inner long one 3, of which the inner long tube 3 is slidably movable relative to the outer short tube 2. The proximal distal end of the cannula 1 is constituted by a head 4 which in the folded position has a cone shape with an axial hole 5 in the axis of the upper base. The diameter of the hole 5 is proportional to the inner diameter of the cannula and constitutes 65% of the outer diameter of the cannula 1, thanks to which it ensures free blood flow into the cannula 1. In the unfolded position, with the outer short tube 2 slid off in the distal proximal direction, the head 4 has the shape of a cup extending outwardly the outer edge of which has a diameter three times the inner diameter of the cannula 1. In addition, the head 4 is equipped, from the inside, with an openwork resilient frame 6 attached to the upper edge of the head 4, made of a thin, resilient wire or plastic bent in the shape of triangles the vertices of which are freely disposed inside the inner long tube 3. The head 4 of the cannula 1 is made of a resilient and stretchable material. On a central section of the inner long tube 3, having a length of 10 to 20%, there are transverse holes 9 in the walls, evenly spaced around its circumference. The inner short tube 2 has two rigid tie rods 8 the free ends of which equipped with ergonomic handles through longitudinal through holes 7 are introduced to the interior of the cannula 1, and then are guided along walls beyond its proximal distal end.

[0031] The cannula 1 with its head 4 closed is introduced into the femoral vein, then, having reached the heart, the right vestibule is passed, and the head 4 of the cannula is placed in the superior vena cava. Then, by pulling the tie rods 8, the outer short tube 2 is pulled down below the head 4 in order to reveal it in its entirety. Then, the frame 6 expands and stretches walls of the head 4 which develops into a cup the upper wall parts of which adhere to the inner walls of the vein, thereby preventing the flow of blood along the outer walls of the cannula 1. A connector, located at the distal proximal end of the cannula, is connected to the apparatus providing extracorporeal circulation. After surgery, the outer short tube 2 is slid back towards the head 4, thereby leading to its closure, then the cannula 1 is removed from the vein.