Endoscopic infusion needle having dual distal stops

• US 20020010427A1
• Filed: 09/28/2001
• Published: 01/24/2002
• Est. Priority Date: 01/08/1997
• Status: Active Grant

• Current Assignee: Symbiosis Corporation (Boston Scientific Corporation)
• Original Assignee: Symbiosis Corporation (Boston Scientific Corporation)
• Inventors: Scarfone, Frank A., Giurtino, Joel F.
• Granted Patent: US 6,423,034 B2
• Time in Patent Office: Days
• US Class Current: 604/171
• CPC Class Codes: A61B 17/34 Trocars; Puncturing needles pointed biopsy instruments A61B10/0233; devices for piercing the ear-lobes A44C7/001; seals or hemostasis valves A61M39/06
• CPC Class Codes: A61B 17/3415 for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06
• CPC Class Codes: A61B 17/3496 Protecting sleeves or inner probes; Retractable tips for protecting body piercing guide needles A61M25/0612
• CPC Class Codes: A61B 2017/3488 Fixation to inner organ or inner body tissue
• CPC Class Codes: A61M 2025/0089 Single injection needle protruding axially, i.e. along the longitudinal axis of the catheter, from the distal tip
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• CPC Class Codes: A61M 25/0084 being one or more injection needles
• CPC Class Codes: A61M 25/06 Body-piercing guide needles or the like

Abstract

An endoscopic infusion needle device includes a catheter within which an injection tube having a distal injection needle is slideably disposed. A proximal actuating handle is coupled to the proximal ends of the catheter and the injection tube, and a distal stopping structure is provided on distal portions of the catheter and the injection tube. In one embodiment, the stopping structures include a rigid elongate skeletal structure occupying a portion of the annular space between the tube and the catheter, and an annular band on the tube which resides within the skeletal structure. The skeletal structure fits tightly within the cannula, allows irrigation fluid to pass through the annular space between the tube and the catheter to exit the distal end of the catheter, prevents the annular band from escaping through the proximal end or the distal end of the skeletal structure, and maintains the tube in substantial axial alignment with the catheter. The annular band is located such that when the tube is moved proximally, the distal end of the injection needle is safely housed within the skeletal structure when the annular band is stopped by the skeletal structure; and, when the tube is moved distally, the distal end of the needle extends approximately 4-6 mm beyond the distal end of the skeletal structure when the annular band is stopped by the skeletal structure.

Claims

1. An endoscopic infusion needle device, comprising:

a) a catheter having a proximal end, a distal end, and defining a first lumen;

b) an injection tube having a proximal end, a distal end, and defining a second lumen, said injection tube extending at least partially through said first lumen and defining an annular space between said injection tube and said catheter;

c) an injection needle coupled to said distal end of said injection tube, said injection needle having an injection lumen in fluid communication with said second lumen;

d) a proximal actuating means coupled to said proximal end of said catheter and to said proximal end of said injection tube for axially displacing one of said catheter and said injection tube relative to the other of said catheter and said injection tube;

e) injection fluid port means coupled to said second lumen for introducing an injection fluid into said injection lumen;

f) a first distal stopping structure coupled to a distal portion of said catheter; and

g) a second distal stopping structure coupled to one said injection tube and said injection needle, wherein

said first and second distal stopping structures cooperate to provide a positive well-defined proximal stopping location wherein said injection needle is shrouded by said catheter and a positive well-defined distal stopping location wherein said injection needle extends out of said catheter.

2. An endoscopic infusion needle device according to claim 1, further comprising:

h) irrigation fluid port means coupled to said first lumen for introducing an irrigant into said annular space, wherein

said first and second distal stopping structures permit said irrigant to flow out of said distal end of said catheter.

3. An endoscopic infusion needle device according to claim 1, wherein:

said first distal stopping structure includes at least one substantially cylindrical member having a plurality of substantially radial exterior struts, said at least one substantially cylindrical member being arranged inside said first lumen such that one of said injection tube and said injection needle passes through said at least one substantially cylindrical member and said struts engage said catheter, and

said second distal stopping structure includes at least one annular structure coupled to one of said injection tube and said injection needle.

4. An endoscopic infusion needle device according to claim 3, wherein:

said first distal stopping structure includes two substantially cylindrical members having a plurality of substantially radial exterior struts, said two substantially cylindrical members being arranged inside said first lumen such that one of said injection tube and said injection needle passes through said two substantially cylindrical member and said struts engage said catheter, and

said at least one annular structure resides in between said two substantially cylindrical members.

5. An endoscopic infusion needle device according to claim 4, wherein:

said two substantially cylindrical members are coupled to each other by a plurality of splines.

6. An endoscopic infusion needle device according to claim 5, wherein:

said first distal stopping structure extends partially out of said distal end of said catheter.

7. An endoscopic infusion needle device according to claim 5, wherein:

said first distal stopping structure is made of two identical pieces.

8. An endoscopic infusion needle device according to claim 6, wherein:

said first distal stopping structure has a smooth distal end.

9. An endoscopic infusion needle device according to claim 1, wherein:

said second distal stopping structure includes two annular structures, each coupled to one of said injection tube and said injection needle, and

said first distal stopping structure resides in between said two annular structures.

10. An endoscopic infusion needle device according to claim 9, wherein:

said first distal stopping structure includes a washer having a radial opening.

11. An endoscopic infusion needle device according to claim 9, wherein:

said first distal stopping structure includes a substantially cylindrical member having a plurality of outer struts.

12. An endoscopic infusion needle device according to claim 11, wherein:

said struts include outwardly extending barbs.

13. An endoscopic infusion needle device according to claim 11, wherein:

said struts are arranged substantially radially relative to said substantially cylindrical member.

14. An endoscopic infusion needle device, comprising:

a) a catheter having a proximal end, a distal end, and defining a first lumen;

b) an injection tube having a proximal end, a distal end, and defining a second lumen, said injection tube extending at least partially through said first lumen and defining an annular space between said injection tube and said catheter;

c) an injection needle coupled to said distal end of said injection tube, said injection needle having an injection lumen in fluid communication with said second lumen;

d) a proximal actuating means coupled to said proximal end of said catheter and to said proximal end of said injection tube for axially displacing one of said catheter and said injection tube relative to the other of said catheter and said injection tube;

e) injection fluid port means coupled to said second lumen for introducing an injection fluid into said injection lumen;

f) a first distal stopping structure coupled to said distal end of said catheter, said first distal stopping structure having a first substantially cylindrical portion extending beyond said distal end of said catheter; and

g) a second distal stopping structure coupled to one of said injection tube and said injection needle, wherein

said first and second distal stopping structures cooperate to provide a positive well-defined proximal stopping location wherein said injection needle is shrouded by said first substantially cylindrical portion and a positive well-defined distal stopping location wherein said injection needle extends out of said first substantially cylindrical portion.

15. An endoscopic infusion needle device according to claim 14, wherein:

said first distal stopping structure includes a second substantially cylindrical portion residing within said first substantially cylindrical portion and coupled to said first substantially cylindrical portion by a plurality of struts,

one said injection tube and said injection needle extending through said second substantially cylindrical portion.

16. An endoscopic infusion needle device according to claim 15, wherein:

said second distal stopping structure includes at least one annular structure coupled to one of said injection tube and said injection needle.

17. An endoscopic infusion needle device according to claim 15, wherein:

said second distal stopping structure includes two annular structures, each coupled to one of said injection tube and said injection needle,

said second substantially cylindrical portion residing in between said two annular structures.

18. An endoscopic infusion needle device, comprising:

a) a catheter having a proximal end, a distal end, and defining a first lumen;

b) an injection tube having a proximal end, a distal end, and defining a second lumen, said injection tube extending at least partially through said first lumen and defining an annular space between said injection tube and said catheter;

c) an injection needle coupled to said distal end of said injection tube, said injection needle having an injection lumen in fluid communication with said second lumen;

d) a proximal actuating means coupled to said proximal end of said catheter and to said proximal end of said injection tube for axially displacing one of said catheter and said injection tube relative to the other of said catheter and said injection tube;

e) injection fluid port means coupled to said second lumen for introducing an injection fluid into said injection lumen; and

f) a centering structure coupled to a distal portion of said catheter, wherein

said centering structure maintains said injection needle in substantial axial alignment with said distal portion of said catheter.

19. An endoscopic needle device according to claim 18, wherein:

said centering structure includes a substantially rigid structure,

said injection tube and said catheter being movable by said proximal actuating means from a first position wherein said injection needle is shrouded by said substantially rigid structure to a second position wherein said injection needle extends distally beyond said substantially rigid structure.

20. An endoscopic needle device according to claim 19, wherein:

said centering structure further includes a stopping structure which provides a positive stop at at least one of said first and second positions.