VENOUS VALVE INCISING BLADES, MANUFACTURING METHOD OF THE SAME AND ARTERY REVASCULARIZATION TREATMENT USING THE SAME

• US 20150216548A1
• Filed: 02/02/2015
• Published: 08/06/2015
• Est. Priority Date: 02/04/2014
• Status: Active Grant

• Current Assignee: Numata Optical Instruments Factory
• Original Assignee: Numata Optical Instruments Factory
• Inventors: NUMATA, Kenji, FURUYA, Takatoshi
• Granted Patent: US 9,872,693 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/320016 Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes A61B10/0233, A61B17/29, A61B17/3207 take precedence
• CPC Class Codes: A61B 17/32075 Pullback cutting; combined forward and pullback cutting, e.g. with cutters at both sides of the plaque
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/22097 Valve removal in veins
• CPC Class Codes: Y10T 29/49996 Successive distinct removal operations

Abstract

A venous valve incising cutter includes a cutting teeth head, a guide, a wire and a coupling rod that couples the guide and a cutting teeth head, all aligned in a rotation axis thereof. More than four pieces of cutting blades are formed on the outer surrounding surface of the cutting teeth head. Each cutting blade has a roughly triangular pyramid shape such that the three ridge lines are composed of the outer surrounding surface of the cutting teeth head and the two planes formed in the reverse side of the outer surrounding surface and the apex is a knife-point of the cutting blade.

Claims

1. A venous valve incising cutter comprising:

a cutting teeth head having a cutting teeth head that has a partly spheroid shape,

a guide,

a coupling rod that has a smaller diameter than the diameter of the guide and couples to the cutting teeth head and

a wire that is connected to the guide at the opposing side to the cutting teeth head, all aligned in a common rotational axis thereof,

wherein in the cutting teeth head having a posterior portion facing the guide and a fore portion in reverse side thereof, the posterior portion has a plurality of cutting blades that are partly composed of the outer surrounding surface thereof and have knife-points toward the guide.

2. The venous valve incising cutter according to claim 1,

wherein a plurality of the cutting blades are more than four pieces, are formed on the outer surrounding surface of the cutting teeth head with an equal gap or the separation length and each of the cutting blades has such a roughly triangular pyramid shape of which apex is the knife-point thereof and three ridges are composed of three pyramid surfaces;

one is the outer surrounding surface of the posterior portion of the cutting teeth head and the remaining two are two planes formed in the reverse side of the outer surrounding surface of the posterior portion of the cutting teeth head.

3. The venous valve incising cutter according to claim 1,

wherein the cutting blades are partly composed of a curved surface which is a part of the outer surrounding surface of the cutting teeth head outside thereof and one or more curved surfaces inside thereof

4. The venous valve incising cutter according to claim 1,

wherein the fore portion of the cutting teeth head has a shape of a hemispheroid of which major radius is larger than the maximum radius thereof and the posterior portion of the cutting teeth head has a shape of a hemispheroid of which major radius is smaller than that of the major radius of the hemispheroid of the fore portion or a shape of a hemisphere of which radius equals to that of the maximum radius of the cutting teeth head or

the cutting teeth head partly has an egg-shape revolution as a whole.

5. The venous valve incising cutter according to claim 1, wherein the cutting blades has a non-sharp tip shape.

6. The venous valve incising cutter according to claim 1,

wherein the cutting blades has such a roughly triangular pyramid shape that the apex is a non-sharp tip shape.

7. A venous valve incising cutter according to claim 3,

wherein the cutting teeth head has a cylindrical portion of which radius is the maximum radius thereof between the fore portion and the posterior portion.

8. A venous valve incising cutter according to claim 1,

wherein the cutting teeth head has, as a whole, an egg-shape revolution of which forefront is the fore portion and backed is the posterior portion thereof

9. A venous valve incising cutter according to claim 1,

wherein the cutting edge has a knife-point or a non-sharp tip incising blade which is in an inner range of the rotational surface radius of the cutting teeth head.

10. A venous valve incising cutter according to claim 1,

wherein two ridge lines of each cutting blade, which are edges made in the outer surrounding surface of the cutting teeth head, form curved lines like as sides of Reuleaux triangle.

11. A venous valve incising cutter according to claim 2,

wherein the ridge lines of all of the cutting blades continuously surround the outer surrounding surface of the cutting teeth head in a series.

12. A venous valve incising cutter according to claim 2,

wherein two facing ridges of adjacent cutting blades have a common end point in a circle line of the maximum radius of the cutting teeth head.

13. A venous valve incising cutter according to claim 2,

wherein the guide comprises a main guide, one or more sub-guides and one or more intra-guide coupling rods coupling therebetween.

14. A venous valve incising cutter according to claim 1,

wherein the coupling rod is a variable length coupling rod which enables to adjust the separation distance between the cutting teeth head and the guide.

15. A venous valve incising cutter according to claim 1,

wherein the coupling rod comprises a variable length coupling rod and a coupling spring so that a gap between the cutting teeth head and the guide is stretchable against the elasticity of the coupling spring.

16. A venous valve incising cutter according to claim 2,

wherein, providing the maximum radius of the cutting teeth head be x, a distance between the knife-point of the cutting blade and the rotational axis y, the distance between the knife-point of the cutting blade and the front end of the guide h and an arc of the posterior portion of the cutting teeth head in a plane including the rotational axis have a length z along the axial direction,

y/x is in a range of 1/3 to 1/2, z/2x in a range of 0.8 to 1.3 and x/h more than equal to 1.3.

17. A manufacturing method for a venous valve incising cutter according to claim 4 including:

a process to slit the posterior portion of the cutting teeth head up in a plane at an inclined angle to the rotational axis toward the diameter of the posterior portion and a process to repeat the process to do the same on every angle that is the angle of 360 degrees divided by an even number of pieces of the cutting blades.

18. A manufacturing method for a venous valve incising cutter according to claim 3 including

a first combination of a process to slit the posterior portion of the cutting teeth head up in a plane at a certain inclined angle from the outer surrounding surface of the posterior portion up to the rotational axis of the posterior portion and a process to repeat to do the same in every angle, that is the angle of 360 degrees divided by an number of pieces of the cutting blades and

the other combination of a process to slit the posterior portion of the cutting teeth head up in a plane including a point to be the knife-pint of the cutting blade at the symmetrically same inclined angle from the outer surrounding surface of the posterior portion up to the rotational axis of the posterior portion and a process to repeat to do the same in every same angle as the first combination of the processes.

19. A manufacturing method for a venous valve incising cutter according to claim 2 including

further a process to cut the knifepoint and a vicinity thereof in a plane with an different inclined angle to the axis from the angle that a ridge line, being formed by crossing of the two planes formed in the reverse side of the outer surrounding surface of the cutting teeth head, has to the axis.

20. A treatment method for a venous valve incising cutter according to claim 1 including following steps,

Step 1:

anastomosing a harvested vein to a central portion of an artery just at an upper part from a the occluded part thereof,

Step 2;

confirming a position of a venous valve of the harvested vein by perceiving palpable pulses at a center side of the venous valve,

Step 3;

inserting the venous valve incising cutter into inside the lumen 3 of the vein forward until a fore portion of the guide 22 reaches the center side of the venous valve,

Step 4;

pulling the wire 26 outwardly after confirming the fore portion of the guide has reached the center side of the venous valve and confirming that the cutting teeth head is caught at the venous valve by perceiving closing of the venous valve by tactile perception of finger tips,

Step 5;

pulling the wire so that the apexes of the cutting stabbers stick and incise the venous valve and confirming the completion of the insection by the perception of the palpable pulses through tactile perception of finger tips.

Step 6;

pulling the wire so that the venous valve incising cutter move to the next venous valve locating in a periphery side from the previous one and repeating Step 3 to Step 5 until the artery blood comes out from the cut end of the harvested vein until confirming all vein valves have been incised,

Step 7;

anastomosing the cut end of the vein at just a lower part from an occluded part of the artery.