Method for making surgical retrieval baskets

• US 5,658,296 A
• Filed: 11/21/1994
• Issued: 08/19/1997
• Est. Priority Date: 11/21/1994
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Corporation
• Inventors: Riley, James W., Bates, James S., Kline, Craig R., Wood, Gary D., Weber, Tony E.
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): Koo, Benjamin K.
• Application Number:
  US08/342,911
• Time in Patent Office: 1,002 Days
• Field of Search: 606/113, 606/114, 606/127, 128/898
• US Class Current: 606/127
• 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 2017/2212 having a closed distal end, e.g. a loop

Abstract

A method for forming a surgical retrieval basket includes cold forming a section of each of a plurality of axially extending wires in a predetermined shape. Securing the wires together proximate the sections with a cavity defined between the sections of the plurality of the wires forms an enlarged portion of a surgical retrieval basket. The retrieval basket comprises a plurality of wires normally encased in a compact form within a sheath whereupon displacement of the sheath to free a portion of the wires enables the wires to form an enlarged retrieval basket. The wires forming the retrieval basket are cold formed in a predetermined shape and are secured together in a predetermined fashion to define the retrieval basket.

Claims

1. A method for forming a surgical retrieval basket having a given number of wires formed in a predetermined configuration along a basket axis in an expanded state comprising the steps of:

(A) cold forming each of a plurality of axially extending, wires into the predetermined configuration;

(B) assembling the given number of wires with the predetermined configuration along the basket axis with the ends thereof being located together, said wires, in the assembled shape, conforming to the predetermined configuration of the basket in its expanded state; and

(C) securing the ends of the assembled wires together thereby to form the basket.

2. A method for forming a surgical retrieval basket as recited in claim 1 wherein said cold forming step preforms a portion of each wire to extend radially from the basket axis between opposed ends thereof and said securing step secures opposed ends of the wires whereby the portions of the wires form the basket about the basket axis.

3. A method for forming a surgical retrieval basket as recited in claim 2 wherein each of the cold formed wires is rectangular in cross-section and lies in a plane between opposed ends of the basket whereby the wires after the securing step define a straight wire basket.

4. A method for forming a surgical retrieval basket as recited in claim 3 wherein the plurality of wires comprise an odd number.

5. A method for forming a surgical retrieval basket as recited in claim 3 wherein each of the wires has shape memory properties.

6. A method for forming a surgical retrieval basket as recited in claim 3 additionally comprising the step of heat treating each of the wires after being cold formed into the predetermined configuration and prior to said assembly step.

7. A method for forming a surgical retrieval basket as recited in claim 2 wherein the wires are cold formed in a helically extending fashion along an axis and the wires upon assembly define a helical basket with each of the wires comprising a turn in the helix.

8. A method for forming a surgical retrieval basket as recited in claim 7 wherein each of the wires has shape memory properties.

9. A method for forming a surgical retrieval basket as recited in claim 8 further comprising the step of heat treating the wires after said cold forming step and prior to said assembly step.

10. A method for forming a surgical retrieval basket as recited in claim 1 further comprising the step of heat treating each of said wires after said cold forming step and prior to said assembly step.

11. A method for forming a surgical retrieval basket as recited in claim 1 wherein each of the preformed wires extends in a loop fashion about an axis, the ends of each of the wires being substantially coextensive along the basket axis and said securing step secures the ends of each of said wires together.

12. A method for forming a surgical retrieval basket as recited in claim 11 wherein each of the wires is rectangular in cross-section and lies in a plane through the basket axis between the ends of the wires such that the sections of the wires define a straight wire basket.

13. A method for forming a surgical retrieval basket as recited in claim 12 wherein each of the wires has shape memory properties.

14. A method for forming a surgical retrieval basket as recited in claim 12 additionally comprising the step of heat treating each of the wires after said cold forming step and prior to said assembly step.

15. A method for forming a surgical retrieval basket having a given number of wires and, in an unrestrained expanded state, having a predetermined configuration, said method comprising the steps of:

preforming sections of each of a plurality of individual axially extending wires to the predetermined configuration wherein the characteristics of each of said wires is substantially identical,

assembling from the plurality of wires the given number of wires with the ends thereof being located together whereby the given number of wires after assembly conform to the predetermined configuration of the basket in its expanded state, and

securing the ends of the given number of wires together thereby to form the basket.

16. A method as recited in claim 15 wherein said preforming step comprises stamp pressing.

17. A method as recited in claim 15 wherein said preforming step comprises spring forming.

18. A method as recited in claim 15 wherein said preforming step preforms a portion of each of the wires to extend radially from the basket axis between opposite ends thereof and said securing step secures the opposed ends of the of the wires.

19. A method as recited in claim 18 wherein said preforming step processes wires having a rectangular cross-section to lie in a plane between opposed ends of the basket whereby the wires after said assembly and securing steps define a straight wire basket.

20. A method as recited in claim 18 wherein said preforming step forms each of the plurality of wires along a helical path with respect to the axis and the wires after said assembly and securing steps define a helical basket with each of the wire sections comprising a turn in the helix.

21. A method as recited in claim 18 wherein each of the wires is stainless steel.

22. A method as recited in claim 15 wherein each of the wires is stainless steel.

23. A method as recited in claim 15 wherein said preforming step forms each of the individual wires into a loop shape with opposed ends of the section proximate one another.

24. A method as recited in claim 15 further comprising the step of heat treating the preformed wires after said preforming step and prior to said assembly step.

25. A method as recited in claim 24 wherein said preforming step comprises stamp pressing.

26. A method as recited in claim 24 wherein said preforming step comprises spring forming.

27. A method as recited in claim 24 wherein said preforming step forms each of the plurality of wires into a loop shape with opposed ends of the section proximate one another.