Curved dilator and method

• US 6,926,728 B2
• Filed: 10/16/2001
• Issued: 08/09/2005
• Est. Priority Date: 07/18/2001
• Status: Expired due to Term

• Current Assignee: Medtronic Europe SARL (Medtronic Plc)
• Original Assignee: St. Francis Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Zucherman, James F., Winslow, Charles J., Hsu, Ken Y., Flynn, John
• Primary Examiner(s): BUI, VY Q
• Application Number:
  US09/978,386
• Publication Number:
  US 20030018350A1
• Time in Patent Office: 1,393 Days
• Field of Search: 606/61, 606/90, 606/191, 606/190, 623 1711- 1716, 600/184
• US Class Current: 606/190
• CPC Class Codes: A61M 2205/6081 Colour codes
• CPC Class Codes: A61M 2210/1003 Spinal column
• CPC Class Codes: A61M 25/01 Introducing, guiding, advancing, emplacing or holding catheters A61M25/10 takes precedence
• CPC Class Codes: A61M 29/00 Dilators with or without means for introducing media, e.g. remedies instruments for performing visual medical inspections of cavities or tubes of the body A61B1/00
• CPC Class Codes: Y10S 606/914 Toolkit for installing or removing spinal positioner or stabilizer

Abstract

The present invention generally relates to a dilator with a curved tip. The curved tip is machined through a specific range of diameters so that a physician can establish the diameter of the opening with the dilator inserted. The angle of the dilator also allows the physician to access the interspinous ligament through a minimally invasive opening in the patients back, minimizing the trauma caused to surrounding body tissue.

Claims

1. A system for creating and dilating an opening in an interspinous ligament, the system comprising:

a series of dilators, each dilator including;

an elongated body having a proximal end and a distal end;

a handle portion connected with the proximal end for manipulating the elongated body, and

a tapered curved tip at the distal end adapted for being urged into the interspinous ligament, the tapered curved tip having a rigid shape and increasing from a first diameter to a second diameter, and

wherein the first diameter of the tapered curved tip for a first dilator is sized such that the first dilator is adapted to create the opening in the interspinous ligament; and

wherein the first diameter of the tapered curved tip for a subsequent dilator is substantially the same as the second diameter of the tapered curved tip of a preceding dilator.

2. The system of claim 1, wherein the tapered curved tip is positioned at an angle relative to the elongated body, so that the interspinous ligament maybe accessed with minimal damage to surrounding body tissue.

3. The system of claim 1, wherein each dilator further includes a mark for indicating a range of diameters of the tapered curved tip.

4. The system of claim 3, wherein the mark is a color coded handle portion.

5. The system of claim 1, wherein at least one of the devices includes a plurality of marks for measuring a width of a dilated opening, thereby allowing an implant to be properly sized.

6. A system for creating and dilating an opening in an interspinous ligament, the system comprising:

a series of devices, each device including;

an elongated body having a first end and a second end;

a handle connected with the first end for manipulating the elongated body; and

a tapered tip at the second end positioned about an axis that forms an angle with an axis of the elongated body, the tapered tip having a rigid shape and a diameter about the tip axis that increases from a first diameter to a second diameter;

wherein the first diameter of the tapered tip for a first device of the series of devices is sized such that the first device is adapted to create the opening in the interspinous ligament; and

wherein the first diameter of the tapered tip for a subsequent device of the series of devices is substantially the same as the second diameter of the tapered tip of a preceding device.

7. The system of claim 6, wherein the angle formed between the tip axis and the elongated body axis is such that the interspinous ligament may be accessed with minimal damage to surrounding body tissue.

8. The system of claim 6, wherein each device further includes a mark for indicating a range of diameters of the tapered tip.

9. The system of claim 6, wherein the mark is a color coded handle.

10. The system of claim 6, wherein each device includes a plurality of marks for measuring a width of a dilated opening, thereby allowing an implant to be properly sized.