MEDICAL DEVICE FOR ENTRAPPING AND EXTRACTING OBJECTS FROM BODY CAVITIES

• US 20170245873A1
• Filed: 02/29/2016
• Published: 08/31/2017
• Est. Priority Date: 02/29/2016
• Status: Active Grant

• Current Assignee: Nordson Corporation
• Original Assignee: Lithotech Medical Ltd. (Nordson Corporation)
• Inventors: Diamant, Valery, CHEPOVETSKY, Gennady, GUTMAN, Igor, VAINSHTEIN, Alexandra, SKOPIN, Yuri
• Granted Patent: US 10,925,624 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/22 Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for dilators A61M29/00
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/00867 shape memory effect
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2210/00 Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof

Abstract

A retrieval medical device for entrapping and retaining an object located in a body for its extraction therefrom is described. The device includes a basket-filter constituted by a plurality of filaments extending from the proximal end towards the distal end. The filaments are bound together in the vicinity of the proximal end to form a plurality of main branches. Each main branch includes at least two filaments. The filaments are entangled together in the vicinity of the distal end. Each main branch has a ramification point at which it ramifies into at least two single filaments extending from the ramification point towards the basket distal end of the basket-filter. One of the single filaments extends in the form of a right spiral, whereas another single filament extends in the form of a left spiral. The filaments extending from the ramification points interlace with each other, thereby forming a mesh between the branching point and the basket proximal end having density greater than 5.1 crossover points per inch.

Claims

1. A medical device for entrapping and retaining an object located in a body for its extraction therefrom, the device comprising a basket-filter having a proximal end and a distal end and constituted by a plurality of filaments extending from the proximal end towards the distal end;

the filaments are bound together in the vicinity of the proximal end to form a plurality of main branches, each main branch comprising at least two filaments, the filaments are entangled together in the vicinity of the distal end;

each main branch has a ramification point at which it ramifies into at least two single filaments extending from the ramification point towards the basket distal end of the basket-filter;

one of the single filaments of said at least two single filaments extending from the ramification point extends in the form of a right spiral, whereas another single filament of said at least two single filaments extending from said ramification point extends in the form of a left spiral;

the filaments extending from the ramification points interlace with each other, thereby forming a mesh between the branching point and the basket proximal end having a density greater than 5.1 crossover points per inch.

2. The medical device of claim 1, wherein each main branch ramifies at the ramification point into two sub-branches, each sub-branch includes half of the filaments of the corresponding main branch and has a sub-branch ramification point at which it ramifies into said at least two single filaments that extend in the form of the left spiral and the right spiral, correspondingly.

3. The medical device of claim 2, wherein said at least two single filaments that extend in the form of the left and right spirals make at least one full turn.

4. The medical device of claim 1, wherein the filaments in the vicinity of the distal end are connected together to form a basket-filter tip at the distal end.

5. The medical device of claim 4, wherein the connected filaments extend outward from the basket-filter tip to form a guide wire.

6. The medical device of claim 2, wherein the filaments in each main branch and in each sub-branch are bound together by twisting together.

7. The medical device of claim 2, wherein the filaments in each main branch and in each sub-branch are directly bound together by at least one technique selected from soldering, brazing and gluing.

8. The medical device of claim 2, wherein the filaments in each main branch and in each sub-branch are bound together by tubes placed over the filaments.

9. The medical device of claim 1, wherein each single filament extending from the corresponding ramification point towards the distal end of the basket-filter bends in the vicinity of the distal end, and returns to another ramification point to form a loop.

10. The medical device of claim 9, wherein at the distal end, each loop is entangled with two other loops formed by two other filaments to define a distal opening at the distal end.

11. The medical device of claim 2, wherein each single filament extending from the corresponding sub-branch ramification point towards the distal end of the basket-filter bends in the vicinity of the distal end, and returns to other sub-branch ramification point, thereby forming a loop.

12. The medical device of claim 11, wherein at the distal end, each loop is entangled with two other loops formed by two other filaments to define a distal opening at the distal end.

13. The medical device of claim 1, wherein each single filament extending from the corresponding ramification point towards the distal end of the basket-filter bends in the vicinity of the distal end, and returns to the same ramification point from which said single filament originates to form a loop.

14. The medical device of claim 13, wherein at the distal end, each loop is entangled with two other loops formed by two other filaments, thereby defining a distal opening at the distal end.

15. The medical device of claim 1, further comprising a control assembly comprising:

a delivery catheter having at least one lumen, and configured to penetrate into the body for reaching the object; and

a manipulation member coupled to the filter-basket, and configured to path within said at least one lumen of the delivery catheter, and to operate for (i) protracting the basket-filter from the delivery catheter for opening thereof and (ii) retracting the basket-filter within the delivery catheter for collapsing the basket-filter inside of the delivery catheter.

16. The medical device of claim 15, wherein the manipulation member includes at least a part of the plurality of filaments extending from the proximal end of the basket-filter.

17. The medical device of claim 15, wherein the manipulation member includes a pushing tube containing at least a part of the plurality of filaments axially disposed within a lumen of the pushing tube along at least a portion of the tube'"'"'s length.

18. The medical device of claim 1, wherein the filaments are made of metallic material.

19. The medical device of claim 1, wherein the metallic material has thermo-mechanical shape memory and superelastic characteristics.

20. The medical device of claim 1, wherein the filaments are made of non-metallic material.