SU1764660A1 - Dilator - Google Patents

Abstract

The invention relates to medicine and can be used both in intravascular surgery and in urology. The aim of the invention is to reduce the pressure on the walls of the tubular organ and increase the reliability of fixation. The dilator is made of a material with a shape memory effect. New is the fact that the dilator is made in the form of a thin-walled tube with slots along the forming part in the middle part and with a symmetrically increasing diameter to the center, which has the shape of a Chinese lantern. 2 Il.

Description

This invention relates to the field of medicine and can be used both in intravascular surgery and in urology.

A tubular organ prosthesis is known in the form of a perforated thin-walled tube, which is cut in a forming pattern from a material with a memory effect and provided with transverse ridges. The prosthesis is intended to flatten atherosclerotic masses on the walls of the intima, to depress and retain pathological formations. However, the prosthesis is used only in intravascular surgery.

The known coil for endourethral drainage (urological coil), selected as a prototype and made in the form of a spring from a material that has a shape memory effect. Diameter

the springs are 1.05-1.15 diameters of the prosthetic tubular organ, the pitch of the coils of the spring is 0.1-0.5, and the spring wire thickness is 0.004-0.15 of the spring diameter.

A disadvantage of the known construction is low reliability, since it is possible for the helix to collapse, pinch the tissues under diagonal shear and high pressure on the walls of the tubular organ due to the small area of contact between the coils of the spring and the walls of the tubular organ.

The aim of the invention is to reduce the pressure on the walls of the tubular organ and increase the reliability of fixation.

This goal is achieved by the fact that in the pathologically narrowed part of the tubular organ a dilator is installed, made of a material having an effective |

J

&

Oh oh

volume of the memory of the form, in the form of a thin-walled tube with slits along the generator and symmetrically increasing diameter to the center, having the form of a Chinese lantern. The dilator, creating a uniform pressure on the walls of the tubular organ, expands the pathologically narrowed area.

Fig, 1 shows the dilator in its original form; Fig.2-dilator attached to the end of the catheter.

The dilator is made in the form of a thin-walled tube 1 with slots along the generatrix in the middle part 2 and a symmetrically increasing diameter towards the center, having the shape of a Chinese lantern. The dilator is made of a biologically inert material with a shape memory effect.

The dilator 1 is cooled to a temperature below 25 ° C before being placed into the vessel, deformed into the reverse spindle shape and installed at the end of the catheter 3. After the dilator 1 is installed, the tip of the catheter 4, which is a pre-dilator, is expanded and the saline is pumped with a temperature of 25 ° With through a catheter 3. Then a catheter 3 with

the fixed dilator 1 is introduced into the tubular organ to the place of the required installation, the tip of the catheter 4 is compressed and the supply of saline is stopped.

As a result of the effect of body heat, the material of the dilator 1 recalls the original shape of the Chinese lantern, creating uniform pressure on the walls

tubular organ, and expands the pathologically narrowed area.

Thus, the dilatator allows reducing the pressure / i.e. on the walls of the tubular organ by increasing the area of contact between the walls of the tubular organ and the material of the dilator and increasing the reliability of fixation due to the presence of slots.

Claims (1)

Claims of the invention A dilator made of a material with a shape memory effect, characterized in that, in order to reduce the pressure on the walls of the tubular organ and increase the reliability of fixation, it is made in the form of a thin-walled tube with slots along the generatrix in the middle part and symmetrically increasing diameter to the center. -jEsayjxs & gyas h shkzhg tdaakzayy Fig, I. ЈЈ2ЈСГ1 & 2 Ј &  -.Ј «/ Г Т JfSc-lf (-Л Ч№-иЧГ ЧРУД ЭД Jv -, -l-l-lС- & aaix. Ј-, JCrffi.: Ka sfcfe-JF it. VT itiw- j d .ei-ass IIfI 1I I} I (jiii-t. a. -fi ™ O ti /. s - / ir. ./aG11ЈЈ & -s-jG v v ™ „.t 1tni. % - .. -CGS iX CHS-V С -ITKiC "l J-BZH) I. -. . ,, 11. -I.J, J.l.J.LJJf,. year vw с-г  t.