Retrieval device

• US 8,057,484 B2
• Filed: 05/25/2005
• Issued: 11/15/2011
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: US Endoscopy Group Inc. (Steris Corporation)
• Original Assignee: US Endoscopy Group Inc. (Steris Corporation)
• Inventors: John, K. Randall, Kaye, Christopher J., Secrest, Dean J.
• Primary Examiner(s): NGUYEN, TUAN VAN
• Application Number:
  US11/137,763
• Publication Number:
  US 20050267489A1
• Time in Patent Office: 2,365 Days
• Field of Search: 606/113, 606/114, 606/127, 606/128, 606/200, 606 46- 52
• US Class Current: 606/113
• 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 2017/2212 having a closed distal end, e.g. a loop

Abstract

An endoscopic surgical device for retrieving objects, such as for example, severed human tissue, foreign objects or impacted food bolus, from within a subject is disclosed. The device includes a body and handle movable relative to the body, a tubular member fixed to the body, a link having a first end fixed to the handle and a second end remote from the body, and a net including a loop and a net element. The loop is expandable and collapsible by action of the handle relative to the body. The loop retains an expanded configuration when deployed to allow for the capture certain objects that were otherwise difficult to capture because of positioning, location, or object characteristics. The loop may be constructed of flat wire and form a polygon shape when deployed. Structure at the distal end of the loop may propel and retain the loop into an open position when in use in narrow organs such as the esophagus.

Claims

1. A device for use within an instrument channel of an endoscope for retrieving objects from within a human body, the device comprising:

a. a body;

b. a handle mounted to and movable relative to said body;

c. a tubular member having a first end fixed to said body and a second end, the tubular member defining a passage and opening at said second end;

d. a link having a first end fixed to said handle and a second end remote from said body, said link extending substantially through said tubular member passage; and

e. a net comprising a loop and a net element secured to said loop and having an object receiving pouch section, said net disposed adjacent said link second end for deployment and retrieval through said tubular passage opening;

f. said loop being expandable to a polygon shape formed by a plurality of linear segments separated by collapse-resistant bends and said loop being collapsible by action of said handle relative to said body, wherein said loop comprises a piece of wire having a single spiral wire structure located at a distal end of said loop;

g. wherein said loop has a maximum width defined by two opposing linear segments of the polygon shape, wherein a distance along a longitudinal axis of the loop from a distal most point of each linear segment to a distal most point of the loop is less than the distance from a proximal most point of each linear segment to a proximal most point of the loop.

2. The device of claim 1 wherein said loop is constructed from a flat wire.

3. The device of claim 1 wherein said loop is constructed from a flat wire comprising at least one collapse-resistant bend.

4. The device of claim 1 wherein net is anchored to said single spiral wire structure.

5. The device of claim 1 wherein said net comprises a plastic tip disposed at said distal end of said loop and having an aperture therethrough, wherein a net anchor is routed through said aperture to secure said net element to said plastic tip.

6. The device of claim 1 wherein said loop retains an expanded configuration when an object retained within said pouch section.

7. An endoscopic device for retrieving an object from within a patient'"'"'s body, the device comprising:

a. a support unit comprising;

i. a body; and

ii. an elongated introducer member having a first end section proximal and fixed with respect to said body and a second end section remote from the body, the introducer member defining a passage and opening at said second end section; and

b. a tissue retrieving net system comprising;

i. a net comprising a resilient wire support loop and a net element having a mouth section slidably disposed on the support loop and a tissue receiving pouch section, said net disposed adjacent said introducer member second end for deployment and retrieval through said introducer passage opening;

ii. a net deployment and retrieval assembly extending substantially through said introducer passage and connected to the net, said assembly comprising a motion transmitting link extending in said introducer passage to said support loop; and

iii. a net actuator unit comprising a handle fixed with respect to said motion transmitting link and movable relative to said body so that shifting said handle relative to said body shifts said net into and out of said introducer passage opening;

c. said introducer member passage having an internal diameter substantially smaller than the width of said support loop when said support loop is deployed, said introducer member engaging said support loop at said opening and resiliently collapsing and elongating said support loop as said net is retrieved and moves into said introducer member passage, said support loop resiliently returning to an uncollapsed configuration as it is deployed;

d. said net system further comprising a net controller for assuring that said net mouth extends fully about said support loop when said support loop is deployed, said controller comprising a net tether anchored at a distal end of said loop;

e. wherein said support loop and net element is expandable to a polygon shape that is formed by a plurality of linear wire segments separated by collapse-resistant bends with a distal end of said support loop comprising a collapse-resistant spiral bend defining at least 360 degrees of a spiral wire structure;

f. further wherein said polygon shape of said support loop has a pair of lengthwise extending parallel linear wire segments that define a maximum width of said support loop, wherein said linear wire segments extending distally from an end of each of said parallel wire segments taper distally to connect with said spiral wire structure to define a first slope, and said linear wire segments extending proximally from an end of each of said parallel wire segments taper proximally to connect within said introducer passage opening, to define a second slope, wherein said first slope is steeper than said second slope.

8. The device of claim 7 wherein said loop is constructed from a flat wire.

9. The device of claim 7 wherein said net is anchored to said collapse-resistant spiral bend.

10. The device of claim 7 wherein said net comprises a tip member disposed at said distal end of said loop and having an aperture therethrough, wherein a net anchor is routed through said aperture to secure said net element to said tip member.

11. The device of claim 7 wherein said loop retains an expanded configuration when an object is disposed within said pouch section.

12. An endoscopic device for retrieving objects from within a human body, the device comprising:

a. a support assembly comprising a base and an elongated hollow tube;

b. a transmitting assembly comprising a handle movable relative to said base and a link having a first end fixed to said handle and a second end remote from said base, said link extending substantially through a length of said tube; and

c. a net comprising a support loop defining a loop opening and a net element secured across said loop opening of said support loop, said loop being movable between an expanded position and a collapsed position by action of said handle relative to said base to move the net element from an open to a closed position;

d. wherein said loop is polygon shaped in said expanded position and is formed by a plurality of linear segments separated by collapse-resistant bends to define a loop opening, and said loop comprises a torsion spring tip at a distal end thereof;

e. further wherein said loop has a maximum width defined by two opposing linear segments of the polygon shape, wherein a majority of each linear segment is disposed closer to the distal most point of the loop than the proximal most point of the loop.

13. A device for use within an instrument channel of an endoscope for retrieving objects from within a human body, the device comprising:

a. a body;

b. a handle mounted to and movable relative to said body;

c. a tubular member having a first end fixed to said body and a second end, the tubular member defining a passage and opening at said second end;

d. a link having a first end fixed to said handle and a second end remote from said body, said link extending substantially through said tubular member passage; and

e. a net comprising a loop and a net element secured to said loop and having an object receiving pouch section, said net disposed adjacent said link second end for deployment and retrieval through said tubular passage opening;

f. said loop being expandable to a polygon shape formed by a plurality of linear segments separated by collapse-resistant bends and said loop being collapsible by action of said handle relative to said body, wherein said loop comprises a piece of wire having a single spiral wire structure located at a distal end of said loop;

g. wherein said plurality of linear wire segments separated by collapse-resistant bends defines a support loop for said net element having;

i) a first support loop portion that is “

V”

shaped and flares outwardly from said elongated hollow tube with a pair of lengthwise parallel wire segments at a widest portion of said “

V”

; and

ii) a second support loop portion that is “

V”

shaped to flare outwardly from said spiral spring to connect with a distal end of each parallel wire segment of said lengthwise parallel wire segments;

iii) wherein said collapse resistant bends and said linear wire segments located between said spiral spring and each of said parallel wire segments are oriented to “

V”

inward into said net and said second support loop portion is shorter along a net length than said first support loop portion.