RU2243845C1 - Apparatus for making multiple-wire helices of electrodes for cardio-stimulation - Google Patents

Abstract

FIELD: medical technique.

SUBSTANCE: apparatus includes housing on which head stock with clamping mechanism is mounted. Head stock is joined with electric motor. Clamping mechanism engages with first end of base member for twisting helix. Second end of base member engages with back tensioning mechanism mounted in vertical strut. Rest is mounted on guiding rack with possibility of motion relative to its lengthwise axis. In upper part of rest on the same axis reels with wound wire are arranged in such a way that their end surfaces are mutually parallel. Each reel is provided with braking member for preventing spontaneous uncoiling of wire. In rest under reels with wire are successively mounted one under another: collector for wire filaments, tension regulator, guiding member, members for shaping and placing wire. Rest is mounted by inclination angle relative to its guiding rack and to base member for twisting helix.

EFFECT: possibility for making helices with improved electrical and technical parameters.

1 dwg

Description

The invention relates to medical equipment, and in particular to devices for the manufacture of small-sized multicore conductive spirals of the Bowden type to electrodes for pacemaking. The device will find effective application for the manufacture of a spiral conductive stranded (4-12-core) wire for implantable electrodes, which ensures the transmission of electrical impulses from the pacemaker to the heart muscles and the reverse detection of electrical impulses from the heart to the stimulator control element.

A spiral conductive stranded wire for implantable cardioelectrodes should have special technical parameters:

- increased electrical conductivity, which is created due to several (4-12) conductive cores operating in parallel, which ensures low consumption of electrical energy of the power supply unit of the pacemaker and, accordingly, an increased resource of its operation;

- increased mechanical strength, sufficient elasticity, small overall dimensions, while the coils of the spiral must be laid tightly, without gaps between the coils.

The modern generation of domestic implantable pacing electrodes contains a similar conductive stranded wire made in the form of a cylindrical spiral with an outer diameter of 0.2-1.8 mm from 4-12 wires with a diameter of 0.08-0.14 mm (see RF patents Nos. 2149038, 2146155, 2177808, 2181300).

High technical requirements regarding the parameters of multicore spirals for cardioelectrodes determine the urgency of the patented development.

A device is known for winding a coil spring onto a mandrel (see N. P. Sobolev “Precision Industry Machines”, “State Publishing House of the Defense Industry”, Moscow, 1953, p. 269, Fig. 216). The device comprises a mandrel on which a spiral is wound. For the manufacture of springs, the end of the wire is fixed in the hole of the clamp and the mandrel is rotated together with the clamp.

The known device has significant disadvantages. This device is suitable for the manufacture of coil springs from a single wire, the electrical parameters of which do not meet the requirements of modern implantable electrodes. The device is also unproductive. Since it involves a number of labor-intensive operations, such as cutting blanks, threading the wire into the machine for each spring, pieces of wound springs, etc.

There is also a device for winding small-diameter springs (I.P.Sobolev “Machine tools of the exact industry”, pp. 271-273, Fig. 218, 218A), the patent solution closest in technical essence and adopted as a prototype. The device consists of the following main parts: front headstock, tailstock, carriage and bed. The headstock spindle is driven by a motor. The tailstock spindle has a cam chuck with a hole for securing the end of the wire. The tailstock spindle receives movement from the headstock spindle through the gear system. The front and rear headstock are interconnected by two cylindrical guides along which the carriage moves. The mandrel for winding the spring is first clamped in the cams of the headstock cartridge, and then in the cams of the tailstock cartridge. A wire coil is mounted on an axis fixed in brackets connected to the base of the carriage. From the coil, the wire goes to the mandrel through the guide rollers, the holes in the rack and in the knife, and the rollers.

For winding springs with coils located at a certain distance from each other, the longitudinal movement of the carriage is carried out by a lead screw, which is rotated by a spindle through a system of gears.

This device allows you to produce springs single-thread type and has significant design flaws that limit the scope of its practical use. So, in particular, the manufactured coil springs do not meet the technical requirements for bowden for implantable pacing electrodes, since they have reduced electrical conductivity, low mechanical strength and elasticity.

The present invention solves the problem of developing a high-performance device for the manufacture of small-sized multicore conductive spirals of the Bowden type with high electrical parameters for implantable pacemaker electrodes.

The solution of the problem is as follows. In a device for manufacturing multi-strand coils for pacing electrodes containing a bed on which a headstock with a clamping mechanism is connected, connected to an electric motor, a spiral winding base, one end of which interacts with the clamping mechanism of the headstock and the other with the rear tensioning mechanism, which mounted on a vertical rack, and the caliper mounted on the guide rail of the caliper with the ability to move relative to its longitudinal axis, according to the present invention, the caliper contains coils with wire, the end surfaces of which are parallel to each other. The coils are mounted on one axis fixed to the upper part of the caliper. In the support, under the coils with wire, a collection of wire threads, a wire tension regulator, a wire guide, a wire shaper and a wire stacker are sequentially mounted one below the other. According to the invention, the caliper is mounted at an angle relative to the guide rail of the caliper and the base for winding the spiral, and each coil with a wire is equipped with a brake element that prevents spontaneous unwinding of the coil.

The technical result of the present invention is to develop an effective device that allows from 4-12 source wires of small diameter to produce a multi-strand spiral to the bowden for implantable pacing electrodes, characterized by high electrical and mechanical characteristics (high electrical conductivity, high mechanical strength, elasticity, small dimensions, reliability in operation, etc.).

It should be noted that, unlike all known devices of a similar purpose, the developed device does not have a lead screw and forced feed of the caliper with a certain spiral winding pitch. The movement of the caliper in the longitudinal direction is carried out by the force of the last turn of the spiral.

The essence of the patented device for the manufacture of multicore conductive spirals for pacing electrodes is illustrated by an example of its specific implementation and the drawing, which shows a General view of the device.

The device comprises an electric motor 1, a bed 2, a front headstock 3 with a collet chuck 4 and a rear tensioning mechanism 5 mounted on a vertical stand 16, and a base for winding the wire 10. At the beginning of work, one end of the base 10 is clamped into the collet chuck 4, and the other into the rear tensioner 5.

The device contains a guide rail of the caliper 6, along which the caliper 8 moves, moves strictly parallel to the base 10. The caliper 8 is mounted on the rotary part 7, which is rotated at an angle in accordance with the angle of inclination of the coils of the winding spiral.

In the upper part of the support 8 on a fixed axis are coils with wire 9. The end surfaces of the coils 9 are parallel to each other. In the support 8, directly under the coils with wire 9, a wire collector 11, a wire tension regulator 12, a wire guide 13, a wire former 14 and a wire stacker 15 are sequentially mounted one below the other.

The rotary part of the support 7 provides for the installation of the wire bundle formed in the wire former 14 at an angle to the base 10.

For the manufacture of multicore conductive springs, various grades of wire are used, for example, wire from steel grade 1X18H10T with a diameter of 0.08 to 0.1-0.2 mm.

The collection of wire strands 11 is used to collect wire strands coming down from the coils 9 at an angle, and forming them into a bundle with an in-line arrangement of wires. The collection of threads 11 is made in the form of a cube into which a row of curved tubes is inserted, each of which is directed to a corresponding spool 9.

The wire tension regulator 12 provides the necessary wire tension and the corresponding preliminary deformation and alignment of the wire. The tension regulator 12 is a mechanism with two parallel plates and a clamping screw, which are mounted with the possibility of rapprochement, clamping the wires and their corresponding braking.

The wire guide 13 is designed to straighten the wire bundle and direct it to work with a certain force through the shaper wire 14. The wire guide 13 is structurally a slotted chamber with a minimum gap between the threads of the wire.

The shaper wire 14 ensures the direction of the bundle of wire directly into the zone of formation of the spiral at an appropriate angle and with a certain tightness. The wire former 14 can be made in the form of a mechanism with a slot through which a wire bundle passes with a minimum gap in height and width of the bundle.

The wire stacker 15 performs the direct formation of a spiral and alignment of the inter-turn distance. The wire stacker 15 is a mechanism with two parallel planes and a thrust pad for aligning the deflection of the spiral.

Each coil 9 with a wire is equipped with a brake element 17 to prevent spontaneous unwinding of the coil 9 in the carriage of the caliper 8. The brake element 17 can be made, for example, in the form of a flat spring mounted on a fixed part of the caliper 8.

A detailed and detailed structural implementation of the collection of threads 11, the wire tension regulator 12, the guide 13, the shaper 14 and the stacker 15 is contained in the applicant's technical documentation (see AFIN documentation 9431.32.046).

A device for the manufacture of multicore conductive spirals for pacing electrodes works as follows.

On the caliper 8 set the required number of coils 9 with a wire of the desired diameter. The wire in the coils 9 must be wound tightly, in even rows and with a certain tension. In order to avoid spontaneous unwinding of the wire in the coils 9, the brake elements 17 are brought into a position in which they brake the wire. Each wire thread is alternately passed through the tubes of the collector 11, through the tension regulator 12 and the slit hole of the wire guide 13. The brake plates of the wire tension regulator 12 are pressed with a screw and the entire wire bundle is passed through the slot of the wire guide 13 and the former 14. The extended wire bundle is initially wound onto the base 10 and clamped in the collet chuck 4. Turn on the engine 1 and in automatic mode carry out the winding of the spiral. The longitudinal movement of the caliper 8 is due to its removal by the pressure of the last turn of the spiral. The uniformity of laying, the diameter of the spiral is automatically obtained by appropriate calculation and rotation of the caliper and the gaps between the wire and the planes of the shaper 14. After making the spiral to the desired length, the electric motor 1 is stopped, the collet chuck 4 and the rear tensioning mechanism 5 are opened. The spiral is freely removed from the base 10 and the duty cycle is repeated.

A patented device for the manufacture of multicore conductive spirals has passed successful technological tests, which confirmed the high performance of the device. The developed device allows to obtain a high-quality conductive spiral of 4-12 wires. A spiral made, for example, of 5 wires, has a flat outer surface, the turns of wire are laid tightly and without gaps. The outer diameter of the spiral is 1.76 mm, the inner diameter is 1.5 mm, the electrical resistance of the spiral with a length of 600 mm is 24 Ohms.

Claims (1)

A device for the manufacture of multi-strand coils for pacing electrodes, comprising a bed on which a front headstock with a clamping mechanism is connected, connected to an electric motor, a coil winding base, one end of which interacts with the front headstock clamping mechanism, and the other with a rear tensioner mounted on vertical rack, and a support mounted on a guide rail of the support with the ability to move relative to its longitudinal axis, characterized in that the support comprises coils with wire, the end surfaces of which are parallel to each other, are mounted on the same axis fixed in its upper part, each coil is equipped with a brake element to prevent spontaneous unwinding of the wire, and in the support under the coils with wire, a collection of wire threads is sequentially mounted one below the other, the regulator tension, guide, shaper and wire stacker, while the caliper is mounted at an angle relative to the guide rail of the caliper and the base for winding the spiral.