SU1000028A1 - Ultrasonic surgical instrument for endartectomy - Google Patents

Description

(54) ULTRASOUND SURGICAL INSTRUMENT FOR ENDARTERECTOMY

one

This invention relates to ultrasound medical instruments and can be used for surgical operations on blood vessels.

A tool for intravascular endarterectomy without ultrasonic oscillation is known, consisting of a rod and a working part in the form of a cylindrical ring or half ring 1.

The known instrument has not found wide application in clinical practice due to frequent perforations of the walls of one of the arteries due to high axial forces and difficulties in removing the atherosclerotic layer for a long time.

A known ultrasonic surgical instrument for endarterectomy, containing a source of ultrasonic vibrations connected to a core hub of variable cross section, and a working part made in the form of a ring attached to the end of the rod at an obtuse angle 2.

A blunt working side of the tool ring provides for separation of layers of the operated vessel in areas where there are no collaterals. When meeting with a collateral orifice, which is deeply affected by atherosclerotic deposits, the blunt working side does not allow further necking without significant increase in the axial force on the rod. This increased effort, in turn, often leads to trauma to the vessel and its perforation. Thus, the further free passage by the instrument of the venous vessel is impossible.

The purpose of the invention is to reduce trauma during deep lesions of the collateral vascular branches by the atherosclerotic process.

15

The goal is achieved by the fact that in an ultrasound surgical instrument for endarterectomy, containing a source of ultrasonic vibrations, connected to a variable-section rod concentrator, and the working part made in the form of a ring attached to the end of the rod at an obtuse angle, the working part of the ring is adjacent to the rod .

Along the rod in the transverse direction at a distance of the length of the half-wave of longitudinal oscillations from each other, parallel grooves are made, each pair of which is offset from the adjacent by an angle from 3 to 90 °.

FIG. 1 shows a surgical ultrasonic instrument for endarterectomy, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a view B in FIG. one.

Ultrasonic surgical instrument for endarterectomy contains a rod 1 of variable cross section and a working part 2, made in the form of a ring attached to the end of the rod 1. The front part of the ring 3 closest to the rod is made in the form of a sharp cutting edge. To reduce the trauma of the vessels by increasing the flexibility of the tool along the rod at a distance of A / 2 from each other in the transverse direction, parallel grooves 4 are made (I is the wavelength of longitudinal oscillations in the concentrator). The grooves along the rod are located with an angular displacement relative to the adjacent pair from 3 to 90 °. This increases the dynamic stability of the instrument.

Ultrasonic surgical instrument works as follows.

A rod concentrator is connected to an electrical transducer (not shown) and excites longitudinal vibrations therein. The working part of the concentrator is introduced into the vessel and the pathologically changed inner layer is separated. With the passage of the working part through the mouth of the collateral, the sharp cutting edge freely cuts off the atherosclerotic deposition at the mouth of the collateral.

however, the axial force on the tool practically does not increase.

Claims (2)

1. Ultrasonic surgical instrument for endarterectomy, containing a source of ultrasonic vibrations, connected to a core hub with variable cross-section, and a working part made in the form of a ring attached to the end of the rod at an obtuse angle, characterized in that in order to reduce trauma during deep lesions the collateral vascular branches of the atherosclerotic process, adjacent to the rod, the working part of the ring is pointed. 2. The tool according to claim 1, characterized in that along the rod in the transverse direction at a distance of half-wave length longitudinal oscillations from each other, parallel grooves are made, each pair of which is offset from the adjacent one by an angle of from 3 to 90 °. Sources of information taken into account in the examination 1.Shalimov A.A., Druk N.F. Surgeons of the aorta and main arteries. Kiev; 1979, p. 17 2.Nikolaev A.A., Loshchilov V.I. Ultrasound technology in surgery. M., 1980, p. 210-215 (prototype).