Frontal infusion system for intravenous burrs

• US 20020099367A1
• Filed: 01/23/2001
• Published: 07/25/2002
• Est. Priority Date: 01/23/2001
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Shuman, Brandon J., Guo, Zihong, Chandrasekaran, Verivada Chandru, Johnson, Tim J.
• Granted Patent: US 6,491,660 B2
• Time in Patent Office: Days
• US Class Current: 606/43
• CPC Class Codes: A61B 17/320758 with a rotating cutting instrument, e.g. motor driven A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002
• CPC Class Codes: A61B 2017/22048 Balloons
• CPC Class Codes: A61B 2017/22067 Blocking; Occlusion A61B2017/22054 takes precedence
• CPC Class Codes: A61B 2017/320004 abrasive
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208

Abstract

Infusion liquid is expelled distally of an ablation burr for washing a blood vessel lesion being treated by the burr. The infusion liquid can be aspirated in a proximate direction to carry the infusion liquid and loose ablated particles of the lesion away from the treatment area. The infusion liquid can be supplied through one or more passages in the burr. In addition to distally extending passages, the burr can include transverse passages extending at least partly in a proximate direction, with the distally extending and proximately extending passages sized so that only a minor portion of the infusion liquid is expelled distally.

Claims

1. A frontal infusion system for use in treating a blood vessel lesion comprising:

a burr having a distal end and a proximate end, the burr being movable through a blood vessel containing a lesion for ablating the lesion;

a conduit connected to the burr to carry a quantity of infusion liquid thereto, the burr having a first passage extending distally from the conduit for expelling infusion liquid from the distal end portion of the burr; and

an aspiration sheath having an aspiration mouth opening adjacent to the burr for aspiration of infusion liquid expelled from the distal end portion of the burr.

2. The system of claim 1, in which the burr has an axial bore for receiving a guide wire and for guiding movement of the burr along the guide wire.

3. The system of claim 2, in which the axial bore forms the first passage for expelling infusion liquid from the distal end portion of the burr.

4. The system of claim 2, in which the first passage for expelling infusion liquid is separate from the axial bore of the burr and is spaced radially outward therefrom.

5. The system of claim 1, in which the burr includes a plurality of passages for expelling infusion liquid received from the conduit, said passages including the first passage extending distally for expelling infusion liquid from the distal end portion of the burr and at least one second passage extending transversely of the first passage.

6. The system of claim 5, in which the second passage extends at a small acute angle in the proximate direction for expelling infusion liquid in a direction having a proximate component.

7. The system of claim 5, in which the burr includes a plurality of second passages extending transversely of the first passage for expelling infusion liquid at least partially in a proximate direction, the first and second passages being sized such that the major portion of the infusion liquid is expelled through the second passages and a minor portion is expelled through the first passage.

8. The system of claim 7, in which the first and second passages are constructed and arranged relatively so that about 5% to about 45% of the infusion liquid from the conduit is expelled distally of the burr.

9. The system of claim 1, including a flex shaft connected to the burr for driving the burr, the flex shaft having a central bore forming the conduit for carrying the infusion liquid.

10. The system of claim 1, including a valve for opening and closing the first passage.

11. The system of claim 10, including a guide wire extending through the blood vessel, the burr having an axial bore for receiving the guide wire for movement therealong, the valve including an enlargement on the guide wire that can be selectively positioned to open and close a distal end portion of the first passage.

13. The system of claim 12, in which the burr is sized for retraction into the aspiration sheath.

14. The system of claim 12, in which the aspiration sheath has a circumferential wall, the one or more second conduits extending through and along the circumferential wall of the aspiration sheath.

15. The system of claim 12, including a flex shaft connected to the burr for driving the burr, the flex shaft having a central bore forming the first conduit for carrying infusion liquid to the burr.

16. The system of claim 12, in which the passages of the burr and the second conduits are constructed and arranged relatively so that about 5% to about 45% of the infusion liquid is expelled distally of the burr.

18. The system of claim 17, in which the burr includes one or more passages extending at least partly in a proximate direction for receiving infusion liquid from the conduit and expelling the infusion liquid at least partially proximately from the burr.

19. The system of claim 18, in which the passages and openings are constructed and arranged relatively so that a minor portion of the total infusion liquid is expelled beyond the distal end of the burr.

20. The system of claim 19, in which the openings and passages are constructed and arranged relatively so that about 5% to about 45% of the total infusion liquid is expelled distally of the burr.

12. A frontal infusion system for treating a blood vessel lesion comprising:

a burr having a distal end and a proximate end, the burr being moveable through a blood vessel containing a lesion for ablating the lesion;

a first conduit connected to the burr to carry a quantity of infusion liquid thereto, the burr having one or more passages extending at least partly in a proximate direction for expelling infusion liquid at least partly toward the proximate end portion of the burr;

one or more second conduits for conveying infusion liquid and constructed and arranged relatively to expel such infusion liquid to the area beyond the distal end of the burr; and

an aspiration sheath having an aspiration mouth opening adjacent to the burr for aspiration of infusion liquid expelled from the second conduits and from the one or more passages of the burr.

17. A frontal infusion system for use in treating a blood vessel lesion comprising:

a burr having a distal end and a proximate end;

a shaft for driving the burr and having a central bore forming a conduit for delivering infusion liquid, a portion of the conduit extending beyond the distal end of the burr and having openings for expelling infusion liquid beyond the distal end of the burr; and

an aspiration sheath having an aspiration mouth opening adjacent to the burr for aspiration of infusion liquid expelled beyond the distal end of the burr.

21. An infusion system for use in treating a blood vessel lesion comprising:

a burr having a distal end and a proximate end;

a drive shaft for selectively rotating the burr in one sense and in the opposite sense;

means for delivering infusion liquid to the area of the burr within a blood vessel; and

an aspiration sheath having an aspiration mouth opening adjacent to the burr for aspiration of infusion liquid delivered to the area of the burr, the outer surface of the burr being shaped to propel infusion liquid in a proximate direction when the burr is rotated in one sense and in a distal direction when the burr is rotated in the opposite sense for washing the area treated by the burr by selectively driving the burr in one sense and the opposite sense coordinated with delivery and aspiration of infusion liquid.

22. The system of claim 21, in which the outer surface of the burr includes helical grooves for driving infusion liquid in a distal direction when the burr is driven in one sense and in a proximate direction when the burr is driven in the opposite sense.