Surgical treatment device

• US 20040092953A1
• Filed: 12/30/2002
• Published: 05/13/2004
• Est. Priority Date: 08/20/2002
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Inventors: Takahashi, Ichiro, Nakagawa, Tateyumi, Komiya, Takaaki, Salameh, Fadi
• Granted Patent: US 7,101,378 B2
• Time in Patent Office: Days
• US Class Current: 606/113
• CPC Class Codes: A61B 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/1407 Loop
• CPC Class Codes: A61B 2018/141 Snare

Abstract

A biotissue excising instrument according to an embodiment of the present invention includes a tubular sheath inserted into a body, a manipulator inserted into the sheath so as to advance and retreat freely through the sheath, and a treatment portion provided at a leading end of the manipulator and having a loop portion that can be unfolded and contracted to accommodate biotissue to be excised. A slit is formed in a side of a leading end of the sheath to project and sink the loop portion of the treatment portion so that the manipulator is advanced or retreated to laterally project or sink the loop portion out of or into the sheath through the slit to unfold or contract the loop portion, thus excising the biotissue in the loop portion.

Claims

1. A biotissue excising instrument comprising:

a tubular sheath inserted into a body;

a manipulator inserted into the sheath so as to advance and retreat freely through the sheath; and

a treatment portion provided at a leading end of the manipulator and having a loop portion that can be unfolded and contracted to accommodate biotissue to be excised,

wherein a slit is formed in a side of a leading end of the sheath to project and sink the loop portion of the treatment portion.

2. A biotissue excising instrument according to claim 1, wherein a reduced diameter portion is provided at the leading end of the sheath and is formed by reducing the inner diameter of the sheath, and

a bent convex portion is formed at a leading end of the loop portion and projects substantially along an axial direction of the manipulator to removably engage with the reduced diameter portion.

3. A biotissue excising instrument according to claim 1, wherein a shoulder portion is formed at the leading end of the loop portion and abuts against a leading edge of the slit when the manipulator is advanced toward the leading end of the sheath.

4. A biotissue excising instrument according to claim 3, wherein the inner diameter of area of the sheath which forms the slit is set to be equal to or larger than the length of area of the loop portion which projects toward the leading end beyond the shoulder portion.

5. A biotissue excising instrument according to claim 1, wherein the loop portion is formed of a solid wire.

6. A biotissue excising instrument according to claim 1, wherein a holding portion is formed at the leading end of the sheath to hold the leading end portion of the loop portion.

7. A biotissue excising instrument according to claim 6, further comprising a guide portion provided at the leading end of the loop portion to guide the leading end portion of the loop portion to the holding portion.

8. A biotissue excising instrument according to claim 1, further comprising a slider provided so as to move freely toward to a proximal end of the sheath to advance and retreat the manipulator,

wherein when the slider is located at a leading end of its moving path, the loop portion is unfolded maximally, and when the slider is located at a proximal end of its movement path, the loop portion sinks completely in an area of the sheath which is closer to the proximal end than the slit.

9. A biotissue excising instrument according to claim 1, further comprising a collar member arranged in the sheath to extend from a proximal edge of the slit toward the proximal end of the sheath by a predetermined length.

10. A biotissue excising instrument according to claim 9, wherein the collar member is formed to reinforce the sheath and prevent biotissue from entering the sheath.

11. A biotissue excising instrument according to claim 9, wherein the collar member has an extending portion extending from the proximal edge of the slit toward the leading end of the sheath by a predetermined length.

12. A biotissue excising instrument according to claim 1, further comprising an opening direction varying mechanism to vary the direction in which an opening surface of the loop portion is opened.

13. A biotissue excising instrument according to claim 12, wherein the opening direction varying mechanism is comprised of a tube fitted around an outer periphery of the sheath so as to advance and retreat freely, the tube having a leading end surface abutting against the loop portion projecting out of the slit to change the direction in which the loop portion projects.

14. A biotissue excising instrument according to claim 12, wherein the opening direction varying mechanism is comprised of a tube fitted around an outer periphery of the sheath so as to advance and retreat freely, the tube having at least one opening which is placed opposite the slit in the sheath from different directions depending on the amount by which the tube is moved relative to the sheath.

15. A biotissue excising instrument according to claim 1, further comprising a tube slidably fitted around an outer periphery of the sheath to close an opening of the slit.

16. A biotissue excising instrument according to claim 1, wherein the sheath has a holding portion which holds the loop portion substantially within one surface at the leading and proximal ends of the slit.

17. A biotissue excising instrument according to claim 12, wherein the loop portion is comprised of a first wire portion and a second wire portion which is harder than the first wire portion and which has a larger outer diameter than the first wire portion, and the loop portion is unfolded by projecting the first wire portion out of the slit, and

wherein the first wire portion is provided with a tendency to bend in such a direction as resists twist of the loop portion.