SU1667847A1 - Surgical instrument - dissector creating hemostasis - Google Patents

Abstract

This invention relates to a surgical medical instrument for dissecting biological tissues and ensuring their hemostasis. The purpose of the invention is to reduce the time of surgery and reduce postoperative complications. The device comprises a housing with a handle, an anode, a cathode and an electrically conductive tip 1 with a combustion chamber 4. The anode is pressed into the bottom of the chamber located in the upper part of the surgical tip and recessed into it by ΔL = L / 2 ^. (1 - D / S), where L is the length of the blade

D - chamber diameter

S is the blade thickness at half the length, while the ratio of the chamber diameter to the blade thickness lies in the range of 0.88≤D / S≤0.98. The tip 1 is heated by the energy of the electric arc. 4 il.

Description

The invention relates to medical technology and is intended to dissect biological tissues with their simultaneous hemostasis and can be used in surgical interventions on organs of both parenchymal structure and muscular structure.

The purpose of the invention is to reduce the time of surgery and reduce postoperative complications.

Figure 1 shows the device, a general view; FIGS. 2 - 3 - tip, projections; figure 4 - section aa in fig.Z.

The device consists of an electrically conductive tip 1 with cutting edges 2, having in cross section the shape of a highly elongated ellipse with a smoothly varying blade length from 1: 2 to 1: 5. The anode 3 is installed and the bottom part 4 of the burning. Chamber 4 ends with a flange 5, on the end surface of which grooves 6 are made for the release of gas (argon). The depth of the notches is in the range from 1/4 to 1/3 of the height of the collar and their number is determined by the minimum allowable gas flow rate. The tip 1 of the transition sleeve 7 is connected to the housing 8, in which the collet 9 is installed with the cathode 10 fixed in it. The collet is separated from the transition sleeve, the housing and the tip by thermally insulating liners 11 and 12. The housing 8 is equipped with a thermal insulator handle 13. The tip can be made of copper.

Chamber 4 is placed in an electrically conductive tip on the side of its non-working end, with its length D1 being determined

from the relation AI (1 - -), where I is the length of the blade; d is the diameter of the protective chamber; S is the thickness of the blade measured at half its length, and the ratio of the diameter of the protective chamber to the thickness of the blade measured at half its length lies in the range

0.88 - 1.0.98. s

The upper limit of this ratio is determined by the minimum allowable rate of heat flow to the tissue, and the lower limit is determined by the maximum allowable heat flux through the chamber wall, which does not cause it to melt.

This set of essential features made it possible to ensure equality of heat fluxes from the heater (electric arc) to the surgical tip and from the surgical tip to the dissected tissue for the entire duration of the operation.

The device works as follows.

After inert gas (argon) is introduced into chamber 4 between the cathode and the anode connected to a current source (not shown), an arc is excited. The arc heats the tip to the operating temperature, the regulation of which in the range of 200 to 950 C is made by changing the arc discharge current in

the range is 0.2 - 10 A. The flow rate of argon is 2-5 L / h.

It has been established that the stability of arc burning does not depend on the spatial orientation with an interelectrode distance of 1

up to 2 mm and allows with a low power consumption of 10-100 W to provide a high heating rate of the surgical tip, compared with the rate of heat transfer from the tip, for dissecting and coagulating the tissue.

The device allows operating in a dry surgical field in a wide range of surgical procedures, which leads to a reduction in the severity of the negative impact of the operation on the organism operated by a significant reduction in blood loss: in case of removal of malignant tumors, a high degree of surgical ablastics is provided.

interventions that can reduce the number of local recurrences of tumors and reduce the growth of distant metastisisation; significantly reduce the psycho-emotional and physical stress on the medical staff.

Claims (1)

Invention Formula A surgical instrument comprising a housing with a handle and a combustion chamber in which a rod-shaped cathode and anode connected to a power source, as well as channels, insulated from the housing by thermal insulating inserts, are placed communicating a chamber with an inert gas source, characterized in that, in order to reduce the operation time and reduce postoperative complications, it is provided with an electrically conductive tip with cutting edges, in which a combustion chamber is placed on the non-working end side, the length of which А I is chosen from the condition А I - I / 2 (1 - d / s), where I is the length of the blade; d - chamber diameter, S- thickness blade in the middle part, a d / S is chosen from the condition of 0.88 d / S 5 0.98. at the same time the outlet openings are made in the form of grooves at the non-working end of the tip, and the anode is located on the bottom of the chamber. FIG. 2 FIG. t Fig.z