Source: https://patents.justia.com/patent/9119662
Timestamp: 2019-10-22 21:57:04
Document Index: 364882321

Matched Legal Cases: ['art, 77', 'Application No. 01', 'Application No. 04760156', 'Application No. 2011267862', 'Application No. 2', 'Application No. 11726313', 'Application No. 14156617', 'Application No. 2012150415', 'Application No. 2013', 'Application No. 10', 'Application No. 2013', 'Application No. 10', 'Application No. 201180029247']

US Patent for Material removal device and method of use Patent (Patent # 9,119,662 issued September 1, 2015) - Justia Patents Search
Justia Patents EndoscopicUS Patent for Material removal device and method of use Patent (Patent # 9,119,662)
Jun 14, 2011 - Covidien LP
A perspective view of the cutter drive adaptor is shown in FIG. 5. In FIG. 5 the cutter drive adaptor is shown separated from the rest of the cutting element. In this embodiment drive shaft 20 may be hollow, having a lumen which forms a guidewire lumen. The cutter drive adaptor has an opening configured to receive the distal end portion of the drive shaft. The cutter drive adaptor may include a lumen 28 positioned to align with the guidewire lumen of the drive shaft to allow a guidewire to pass through the cutter drive adaptor. The drive shaft may be made from any suitable material having sufficient flexibility. For example, the drive shaft may comprise braided wires, helically wound wires or a solid tube. In one embodiment as shown in FIG. 4B, drive shaft 20c is made of helically wound stainless steel wires that may be left hand or right hand wound and that have welded proximal and distal ends that do not extend past the outside dimension of the braided steel wires. In some embodiments drive shaft 20c is comprised of multiple layers of helically wound wires, in some cases adjacent layers of helical wound wires are wound with opposite handedness. The guidewire lumen extends from the proximal end to the distal end of drive shaft 20 so that the catheter may be used as an over-the-wire catheter. In a rapid exchange embodiment of the catheter shown in FIG. 16 the catheter is provided with a shortened guidewire lumen. In the rapid exchange embodiment the drive shaft need not have a guidewire lumen and, therefore, may optionally be solid or at least need not be hollow.
In an alternative embodiment shown in FIGS. 13 to 15 the drive shaft and cutting element may be modified to further ensure that the drive shaft does not obstruct the passageway between the window and the collection chamber. FIG. 13 shows an alternative drive shaft 20d which has an enlarged ball 50 at its distal end. FIG. 14 shows an alternative cutter drive adaptor 41a having a socket 52 at its distal end shaped to receive the enlarged ball 50 of drive shaft 20d. FIG. 15 is a cross-sectional view of drive shaft 20d coupled to cutter drive adaptor 41a. A distal region of drive shaft 20d adjacent enlarged ball 50 has a hexagonal cross-sectional shape. Cutter drive adaptor 41a includes a lumen which tapers inwardly from the proximal end to socket 52. The tapering shape is configured to match the cross-sectional shape of the drive shaft adjacent the enlarged ball. In this embodiment the connection between the drive shaft and the cutter drive adaptor is mechanical. Ball 50 is securely retained within socket 52 and prevents any longitudinal movement of the drive shaft with respect to the cutter drive adaptor. The tapered internal sides of the cutter drive adaptor are sized to prevent the drive shaft from rotating with respect to the cutter drive adaptor. However, the tapered internal sides of the cutter drive adaptor are sized to allow some pivoting movement of the drive shaft with respect to the cutter drive adaptor. This configuration allows the cutter drive adaptor 41a to receive and be rotated by drive shaft 20d while at the same time permitting the cutter drive adaptor to tilt or pivot about enlarged ball 50. Thus, in this embodiment, when cutter drive adaptor 41a is tilted towards the cutting window to expose the cutting element through the window in the manner previously described, the drive shaft is configured to remain centered within the catheter body or is at least not urged toward the window to a substantial degree. This embodiment thus reduces potential interference of the drive shaft with cut material passing from the cutting window to the collection chamber.
An alternative catheter embodiment is shown in FIGS. 7 and 8. Catheter 2A is shown wherein the same or similar reference numbers of catheter 2A refer to the same or similar structures of catheter 2 and all discussion concerning the same or similar features of catheter 2 are equally applicable here unless noted otherwise. Compared to catheter 2, drive shaft 20a has been given a narrowed diameter immediately proximal to the cutting element 4. This narrowed diameter presents less obstruction to the passage of material from cutting window 6 to collection chamber 12. Thus, catheter 2A allows for greater ease of collecting atheroma/tissue at a treatment site by providing additional space for the atheroma/tissue to be collected inside the catheter. It should be noted that the drive shaft 20a (or the drive shafts of any of the other embodiments disclosed herein) could be additionally coated with a lubricant or Teflon to reduce atheroma/tissue from sticking to the drive shaft 20a.
Another embodiment of the catheter is shown in FIG. 9. Catheter 2B is shown wherein the same or similar reference numbers of catheter 2B refer to the same or similar structures of catheter 2 and all discussion concerning the same or similar features of catheter 2 are equally applicable here unless noted otherwise. Compared to catheter 2, drive shaft 20b has been provided with auger blades 29 immediately proximal to the cutting element 4. As the auger blades 29 rotate along with drive shaft 20b, atheroma/tissue entering the cutting window is pulled away from the cutting area and treatment site and into the collection chamber 12 of catheter 2B. This embodiment provides greater ease of collecting atheroma/tissue at a treatment site by providing additional space for the atheroma/tissue to be collected inside the catheter. It should be noted that the connecting shaft 20b and auger blades 29 could be additionally coated with a lubricant or Teflon to reduce atheroma/tissue from sticking to the drive shaft 20b. In this embodiment the cutting element may be elongated and have the features of cutting element 4c described below in connection with FIGS. 10 to 12. As discussed previously, suction may be provided through catheter 2 to assist with drawing material proximally from the cutter element to auger blades 29.
FIGS. 10 to 12 show another catheter embodiment. Catheter 2C is shown wherein the same or similar reference numbers of catheter 2C refer to the same or similar structures of catheter 2 and all discussion concerning the same or similar features of catheter 2 are equally applicable here unless noted otherwise. Compared to catheter 2, catheter 2C has an elongated cup shaped surface 24c of the cutting element 4c with a larger radial surface area than previously described corresponding cup shaped surfaces of cutting element 4. Additionally the elongated cup shaped surface 24c has an opening 25c with side cutting blade 26c which aids in material collection capability. Thus, cutting element 4c has two separate cutting structures and cutting positions. In the first cutting position as shown in FIG. 10, cutting element 4c is angularly extended through opening 6 as discussed above. In this position cutting edge 22 extends beyond and through cutting window 6. In this position the cutting is accomplished in the same manner as described with respect to catheter 2. Specifically, catheter 2C is pulled proximally through the vessel across the treatment site (lesion) to cut plaque from the lesion. Additionally, catheter 2C can be advanced distally while material is cut by cutting blade 26c, which enters through opening 25c. The material that enters opening 25c will be pushed proximally by additional material that enters opening 25c and will then get transported proximally by any of the tissue transportation methods discussed herein, including by suction and/or by auger blades if provided. In the second cutting position as shown in FIGS. 11 and 12, the cutting element 4c is positioned within the cutting window but is not tilted outwardly. In this cutting position the cutting element 4c is rotated and any material from the vessel wall which invaginates the cutting window will be cut by side cutting blade 26c. Further, cutting window 6 may be provided with a cutting edge 6c against which cutting blade 26c acts to more efficiently cut the material. In this cutting position the catheter may remain stationary within the vessel or may be moved either proximally or distally during the cutting process. Although not shown, cutting element 4c includes a cutter drive adaptor as shown in FIG. 5 if the catheter has an optional rotating tip or a modified cutter drive adaptor if the catheter has a stationary tip.
Although the method of use has been described with respect to catheter 2 the procedure for use of catheters 2A, 2B, 2C and 2D is similar. For example, catheter 2A, shown is FIGS. 7 and 8, is used in a similar manner. The narrowed diameter of the drive shaft immediately proximal to the cutting element allows the cutter to tilt through the cutting window without causing the drive shaft to move laterally which might obstruct the window. Further, during use the cutting element of catheter 2A can be withdrawn proximally to pack material which has been cut and then moved distally back to the cutting position. Catheter 2B, shown in FIG. 9, is used in a similar manner with the additional feature that the auger blades pull cut material entering the cutting window proximally to reduce the possibility of the cutting window becoming obstructed with cut material during the cutting process. Catheter 2C, shown in FIGS. 10 to 12 may be used in the manner described above. Specifically, in the first cutting position catheter 2C can be moved across the treatment site in a proximal direction to cut material with cutting edge 22 and can be advanced distally across the treatment site to cut material with cutting blade 26c. Catheter 2c can be moved distally and proximally across the treatment site as many times as necessary to remove a desired amount of diseased material. Additionally, catheter 2C may be used with the cutting blade in the second cutting position as described above. In the second cutting position catheter 2C will cut material which invaginates the opening 25c while the catheter is stationary or while catheter 2c is moved distally or proximally across the treatment site. Catheter 2D, shown in FIG. 16, is used as described above except that it is advanced to the treatment site over a guidewire positioned in the guidewire lumen defined by side mounted tubular portion 55.
a cutting element operatively coupled to the rotatable shaft, the cutting element including: a body having proximal and distal ends and an axis extending between the proximal and distal ends, wherein the rotatable shaft is configured to impart rotation to the cutting element so that the body rotates about said axis; an end cutting blade at one of the proximal and distal ends of the cutting element body and extending generally transverse to said axis, the end cutting blade configured to remove material from the vessel through the opening as the catheter is moved proximally through the vessel; and a side cutting blade extending generally along said axis of the cutting element body and configured to remove material from the vascular lumen through the opening when the catheter is stationary within the vessel.
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Patent Publication Number: 20110306995
Inventor: John Robert Moberg (Elk River, MN)
Application Number: 13/160,044