RU2297850C1 - Pneumo- and/or hydrodrive device usable in artificial pulsating blood circulation systems - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: device has elastic flexible working cavity of setting unit designed as hollow ring. The electromagnet is concentrically fastened in detachable plastic box which is fixed on medical belt together with independent power supply source feeding electromagnet and controlled switching device.

EFFECT: improved weight and size characteristics of non-implantable system unit.

4 cl, 6 dwg

Description

The invention relates to the field of medicine - cardiac surgery, directly relates to means and methods of actuating artificial pulsating blood circulation systems, in particular by means of a pneumatic and (or) hydraulic actuator, the main part of which is not implanted in the patient’s chest cavity.

The proposed device contains the master and actuator parts in the form of elastic-elastic working cavities communicating by means of a connecting hose. The working cavity of the driving part is made in the form of a hollow ring of oval cross-section, which, together with the cylindrical-shaped electromagnet covered by it, is fixed inside a plastic mountain-shaped box consisting of its base part and a removable cover. A plastic box together with an autonomous electromagnet power supply and an electronic switching device can be mounted on the patient’s medical belt.

The described technical solution is most suitable for use in artificial pulsating blood circulation systems with a working volume of the executive part of the pneumatic and (or) hydraulic drive, much smaller than the stroke volume of the blood (see, for example, patents RU No. 2242252, RU No. 2242252 and BIPM No. 28, 10.10. 2004, p. 45).

In addition to the hollow ring 1 (Fig. 1), on the inner side of the bottom of the base part 2 of the plastic box having an annular cavity of curvilinear profile, a cylindrical electromagnet 3 with an anchor 4 in the form of an elastic-solid circular disk of a concentric-wave profile coaxially mounted on a concave end is concentrically strengthened the central pole 5 of the electromagnet 3. The movable peripheral part 6 of the armature forms a working gap with the curved surface of the peripheral annular pole 7 of the electromagnet 3, and the movable annular edge of the armature 4 ends INDICATES annular corrugation 8 cooperating with a working chamber of the hollow ring 1. A plastic box consisting of a base portion 2 and a detachable lid 9 is arranged to enter the connecting hose 10 and the current supply to the electromagnet 3.

To reduce the resistance of the magnetic circuit, the armature 4 of the electromagnet 3 can be multilayer (figure 2), concentrically decreasing in thickness in the direction from the center, and to reduce the rigidity of its moving part, radial cuts 11 are advisable.

The working cavity of the driving part of the device may be in the form of a hollow loop of an oval cross-section (Fig. 3), one of the ends of which is made blind, and the other ends with an elastic joint hose 10.

The annular corrugation 8 interacting with the working cavity of the driving part of the device can be made at the open end of the cylindrical cup 12 (Fig. 4), concentrically mounted with its bottom at the end of the movable cylindrical armature 13 of the electromagnet 14, while the cylindrical wall of the cup 12 has holes with inserted them balls 15, for holding which on the outer surface of the glass 12 concentrically mounted sleeve 16, forming the necessary gap between the cylindrical surface of the electromagnet 14 and the inner surface of the lki 16.

For technological and operational reasons, the connecting hose 10 may have a connector (figure 5), made in the form of a sleeve 17, with pointed conical ends and a spherical middle part, tightly covered by an elastic collar 18 with a tightening band.

For pulsed switching on of electromagnet 3 or 14, an autonomous source of electricity 19 and an electronic switching device 20 are mounted on the patient’s medical belt 21 (Fig. 6) to fix the base part 2 of the plastic box directly on the patient’s body, on the outside of the bottom of the base part a cavity is provided, which communicates with the means of rarefaction of the gas medium with a flexible hose (see Figs. 1-3), and for fixing the removable cover 9 on the base part 2 of the plastic box is an elastic-elastic cuff 22 (figure 3).

The action of the described device can be shown as an example of one of the possible options for its implementation (figure 1), having considered one cycle of its operation. The current pulse of the autonomous power source 19 through the electronic switching device 20 enters the winding of the electromagnet 3, the armature 4 of the electromagnet 3 is activated, as a result of which the annular corrugation 8 compresses the working volume of the hollow ring 1 and the working medium from the working volume of the hollow ring 1 enters the working volume of the executive part drive, then, when the voltage in the winding of the electromagnet 3 is turned off, the working medium under the action of an elastic elastic diaphragm of an artificial organ implanted in the patient’s chest cavity returns I am in the working volume of the hollow ring 1. This completes the cycle of the device.

The most important result of the implementation of the proposed technical solution is to improve the weight and size characteristics of the non-implantable part of the cardiopulmonary bypass system, which allows placing its constituent elements on the patient’s medical belt (Fig. 6).

Literature

RU 2140793 C1, 10.11.1999.

RU 2200585 C2, 03.20.2003.

RU 2242252 C2, 12.20.2004.

RU 2261117 C2, 09/27/2005, BIPM No. 28, 10/10/2004, p. 45.

Claims (4)

1. A pneumatic or hydraulic actuator for an artificial organ of auxiliary and replacement circulatory systems, comprising a defining part and an implantable actuating part nonimplantable in the patient’s chest cavity, made in the form of sealed cavities from an elastic material communicating by means of an elastic flexible connecting hose, characterized in that the working cavity the master part has the shape of a hollow ring of oval cross-section located inside the housing element, made in the form of a plastic mountainous box, consisting of a base part and a removable cover, while on the inner side of the bottom of the base part an annular depression of a curvilinear profile is made and a cylindrical electromagnet concentrically strengthened with an anchor in the form of a circular disk of a concentric wave profile coaxially mounted on the concave end of the central pole electromagnet, the movable peripheral part of the armature forms a working gap with the curved surface of the peripheral annular pole of the electromagnet, the movable the main edge of the anchor ends with a corrugation interacting with the annular working cavity of the defining part of the pneumatic or hydraulic actuator, and the plastic box of the housing element is made with the possibility of introducing a connecting hose and a current lead to the electromagnet. 2. The device according to claim 1, characterized in that the anchor of the electromagnet is multilayer with a concentrically decreasing thickness in the direction from the center and has radial cuts along the edge. 3. The device according to claim 1, characterized in that the working cavity of the driver of the pneumatic or hydraulic actuator has the form of a hollow loop of oval cross-section, one end of which is made blind, and the other ends with a connecting hose. 4. The device according to claim 1, characterized in that the connecting hose has a connector made in the form of a sleeve with conical ends and a spherical middle part covered by an elastic cuff or a tightening harness.

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