Device for removing plaque from arteries

• US 4,808,153 A
• Filed: 11/17/1986
• Issued: 02/28/1989
• Est. Priority Date: 11/17/1986
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Ultramed Corporation
• Inventors: Parisi, Tulio T.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): KRUTER, JEROME
• Application Number:
  US06/931,514
• Time in Patent Office: 834 Days
• Field of Search: 604/22, 128/303 R, 128/305, 128/66, 433/91
• US Class Current: 604/22
• CPC Class Codes: A61B 17/2202 the ultrasound transducer being inside patient's body at the distal end of the catheter
• CPC Class Codes: A61B 2017/22021 electric leads passing through the catheter
• CPC Class Codes: A61B 2217/005 with suction drainage system

Abstract

A hollow member is made from a material such as titanium with properties of vibrating longitudinally. The interior surface of the hollow member is preferably quite smooth. At least one member is disposed on the hollow member and is provided with properties of vibrating longitudinally at an ultrasonic frequency when energized. Preferably a plurality of such vibratory members are disposed around the periphery of the hollow members. The vibratory members may be crystals. The vibratory members are preferably disposed in a socket in the hollow member so that the vibratory members are flush with the hollow member. A hollow catheter made from a pliant material such as a silicone rubber is disposed on the hollow member and the vibratory members and is preferably provided with a substantially smooth inner periphery and a substantially smooth outer periphery along its length. The forward end of the catheter preferably covers the forward end of the hollow member and preferably has a blunt disposition. The hollow member, the vibratory members and the catheter are disposed in an artery and are movable along the artery to emulsify plaque on the interior wall of the artery without damaging the interior wall of the artery. The emulsified plaque is removed as by a vacuum through the hollow member and the catheter.

Claims

1. In combination for removing an obstruction from the interior wall of an artery,

a member made from a light and strong material and provided at its forward end with a hollow interior defined by an interior wall having a smooth configuration and with characteristics of vibrating at an ultrasonic frequency,

means disposed on the member at a position abutting the forward end of the member and providing energy at the ultrasonic frequency for vibrating the member at the ultrasonic frequency to emulsify the obstruction,

a hollow tube covering the member and the ultrasonic energy means and made from a pliant material and extending rearwardly past the rear ends of the member and the ultrasonic energy means to facilitate the movement of the tube, the member and the energy means along the interior wall of the artery, and

the hollow tube covering the member and the ultrasonic energy means along the length of the ultrasonic energy means and the member having a chamfered configuration at its forward end to facilitate the removal of the obstruction from the interior wall of the artery by emulsification of the plaque in accordance with the vibrations of the member at the ultrasonic frequency,

the member being provided with a socket at its outer periphery to receive the ultrasonic energy means and to provide the hollow tube with substantially uniform external dimensions along the length of the tube when the ultrasonic means is disposed in the socket.

2. In combination for removing plaque from the interior wall of an artery,

a hollow member made from a material having characteristics of vibrating at an ultrasonic frequency,

means disposed on the hollow member at the forward end of the hollow member for positioning the forward end of the member in abutting relationship with obstruction and having characteristics of vibrating at an ultrasonic frequency, when energized, to produce a vibration of the hollow member at the ultrasonic frequency, and

a hollow tube made from a pliant material and enveloping the hollow member and the ultrasonic vibrating member

the member having a chamfered forward end to facilitate the removal of the plaque from the interior wall of the artery, in accordance with the longitudinal vibrations of the member at the ultrasonic frequency, without damaging such interior wall, and

means for providing for a removal through the hollow member and the hollow tube of the plaque removed by emulsification from the interior wall of the artery.

3. In a combination as set forth in claim 2,

the ultrasonic energy means constituting at least one crystal disposed around the periphery of the hollow member.

4. In a combination as set forth in claim 2,

the ultrasonic energy means constituting a plurality of crystals disposed around the periphery of the hollow member,

the hollow member being provided with a shoulder at its forward end to receive the crystals in the plurality, and

the tube enveloping the crystals and the member having a substantially uniform internal disposition along its length.

5. In a combination as set forth in claim 4,

the hollow member being made from titanium and the tube being made from a nylon.

6. In a combination as set forth in claim 5, the chamfered end of the member extending forwardly beyond the forward end of the tube and the tube extending rearwardly beyond the rear end of the member.

7. In a combination as set forth in claim 6,

the chamfered end of the member being chamfered and the inner surfaces of the hollow member and the tube being smooth and substantially continuous with each other.

8. In combination for removing an obstruction from the interior wall of an artery,

means having a hollow configuration and constructed to provide energy at an ultrasonic frequency,

a member for dissolving the obstruction on the walls of the artery in accordance with vibrations of the member at the ultrasonic frequency, the member having a forward end for abutting the plaque on the walls of the artery,

the ultrasonic energy means being disposed on the member at a position adjacent the forward end of the member for applying energy at the ultrasonic frequency to the member to vibrate the member at the ultrasonic frequency, and

a tube disposed on the member and the ultrasonic energy means and made from a pliable material to facilitate the movement of the member and the ultrasonic energy means along the interior wall of an artery, the tube extending rearwardly past the rear ends of the ultrasonic energy means and the member,

the member being formed to define a chamfered edge at its forward end for facilitating the removal of the obstruction from the interior wall of the artery by emulsification in accordance with the vibrations of the member at the ultrasonic frequency,

the inner surfaces of the member and the tube being smooth and being substantially continuous with each other,

the member being provided with a socket on its periphery,

the ultrasonic energy means being formed from a plurality of crystals disposed in an annular relationship in the socket on the periphery of the member and the tube covering the crystals.

9. In combination for removing an obstruction from the interior wall of an artery,

means having a hollow configuration and constructed to provide energy at an ultrasonic frequency,

a member for dissolving the obstruction on the walls of the artery in accordance with vibrations of the member at the ultrasonic frequency, the member having a forward end for abutting the plaque on the walls of the artery.

the ultrasonic energy means being disposed on the member at a position adjacent the forward end of the member for applying energy at the ultrasonic frequency to the member to vibrate the member at the ultrasonic frequency, and

a tube disposed on the member and the ultrasonic energy means and made from a pliable material to facilitate the movement of the member and the ultrasonc energy means along the interior wall of an artery, the tube extending rearwardly past the rear ends of the ultrasonic energy means and the member,

the member being formed to define a chamfered edge at its forward end for facilitating the removal of the obstruction from the interior wall of the artery by emulsification in accordance with the vibrations of the member at the ultrasonic frequency,

the member being provided with a shoulder at its external periphery to receive the ultrasonic energy means at the position abutting the forward end of the member,

the member being provided with a socket,

the ultrasonic means being formed from a plurality of crystals disposed in the socket in the member in annularly spaced relationship to one another and the tube covering the member and the ultrasonic means along the length of the ultrasonic means.