RU186958U1 - Venous cannula for drainage of the heart - Google Patents

Abstract

The utility model relates to the field of medicine and medical technology, namely to cardiovascular surgery, and is aimed at ensuring the optimal rate of venous return to the IR circuit during cannulation of vena cava, due to the possibility of regulating the occlusion of the venous cannula without special additional devices, such as clamps.

This is achieved by the fact that the venous cannula for drainage of the heart, containing a wire-reinforced body, which ends at one end with a tip having perforations, collective tunnels and cutouts extending from them, opening into the general lumen, and at the other with a connector for attaching to the IR device, additionally has protrusions with a clamping clamp and a corrugated surface.

A useful model may find application in the practice of cardiovascular surgery, in particular during operations using IR and accompanied by cannulation of vena cava.

Description

The utility model relates to medicine and medical technology, namely to cardiovascular surgery, and is intended for cannulation of vena cava during cardiopulmonary bypass.

Today, for operations on a bloodless heart, IR devices are widely used, which are installed by cannulation of the vena cava and aorta with connection to a venous reservoir and an oxygenator with an arterial filter, respectively. At the same time, sometimes during the IR, a collapse of the venous walls occurs with obstruction of the collecting holes of the cannula tip, due to the high rate of venous return to the IR circuit, exceeding the possibility of blood flow through the arterial line, which leads to practically stopping venous drainage.

This situation is currently being resolved by increasing occlusion of the venous line using clamps. However, this tactic does not always eliminate this problem, since the surgical instruments used in this process do not allow to fully regulate the blood flow velocity, because they can only clamp the cannula body in a fixed diameter to a certain diameter, and the use of several clamps significantly increases the weight of the structure and can adversely affect the fixing of the connector of the specified drainage with the venous reservoir.

Currently, there are various venous cannulas for drainage of the heart, produced by the medical industry.

Thus, a two-stage venous catheter is known [US Patent No. 4,129,129 of 12/12/1978], having a rounded nose, with elongated holes located around the circumference, and an enlarged part of a larger diameter tube with perforations for receiving blood, and an obturator having a diameter having a removable tube equal to the inner diameter of the rounded nose and tightly fitting to it.

Also known is a single-stage venous catheter [US Patent No. 4,596,548 dated 06/24/1986], which contains an integral part, which consists of many elongated ribs located around a common axis, forming elongated open sectors between them, and passes into the root section, which has an end for connection with a connecting tube and an axial hole communicating with the channels of the elongated sector formed by said ribs.

A venous catheter is known [US Patent No. 4,639,252 of 01/27/1987], containing a body whose distal part has a smaller diameter, which is necessary for location in the vena cava, and contains collective holes, and the proximal one has a larger diameter, and the walls also have a section with drainage perforations opening into the general lumen.

Known catheter for vena cava [US Patent No. 4,680,029 from 07/14/1987] containing a hollow body with perforations, a ribbed tip and an obturator.

A venous catheter is known [US Patent No. 4,863,441 of 09/05/1989], having a reinforced body, which contains a nose of a smaller diameter, a transition and a part of a larger diameter with collective holes.

Known single-stage venous catheter [US Patent No. 5,041,084 from 08/20/1991], consisting of a hollow body having a distal and proximal end, many wall slots in the body that open in its inner lumen, as well as a rounded tip attached to the distal end of the specified body .

Known cannula [US Patent No. 2007/0038170 A1 of 02/15/2007], containing a hollow body and collective holes that open into the general lumen.

A vascular cannula is also known [RU No. 2 233632 from 08/10/2004], including an elongated body having at least two ends, while the area adjacent to one of the named ends is the connecting part of the cannula, and the area adjacent to the second from the named ends, is the working part of the cannula, and in the said elongated body a through channel is made in such a way that it receives fluid from the end adjacent to the connecting part of the cannula, and exits from the end adjacent to the working part of the cannula, characterized in that its working part is made in the form of a spiral so that the ratio of the size of the diameter of the spiral and the size of its step provides a ratio of the rotational speed of the fluid to the magnitude of its translational speed as

A common drawback of these medical devices is that when they are used, at the time it becomes necessary to increase occlusion of the venous line due to a mismatch in blood inflow and outflow along the main highways of the IR device, they require the use of additional clamps, since they do not have special design features in their case , which would reduce the speed of blood flow by reducing the diameter of the outflow tube without the use of additional tools.

The surgical clamps used in this case, firstly, do not always create proper occlusion of the cannula, because they can only pinch its body to a certain diameter in a fixed manner, and secondly, the use of several such tools to achieve

the optimal convergence of the diametrically opposite walls of the outflow tube significantly increases the weight of the structure due to metal branches and can adversely affect the fixation of the connector of the specified drainage with the venous reservoir.

The purpose of the utility model is to ensure the optimal rate of venous return to the IR circuit during cannulation of vena cava, due to the possibility of regulating the occlusion of the venous cannula without special additional devices, such as clamps.

The technical result of the goal is achieved by the fact that the venous cannula is represented by a reinforced wire 1 body 2, which ends at one end with a tip 3 having perforations 10, collective tunnels 4 and cutouts 5 extending from them, opening into the general lumen 11, and on the other with a connector 6 for attachment to the apparatus by IR, protrusions 7 with a clamping lock 8 and a corrugated surface 9.

In fig. 1 shows a general view of a utility model.

In fig. 2 shows a detail of the tip 3.

In fig. 3 shows a longitudinal section of the tip 3.

In fig. 4 shows a top view of the tip 3.

In fig. 5 shows a cross section of the tip at the midpoint of cutouts 5.

In fig. 6 shows a cross section of the tip at the level of perforations 10.

In fig. 7 shows the detail of the connector 6.

In fig. 8 shows a longitudinal section of a connector 6.

In fig. 9 demonstrates the interaction of the clamping latch 8 with the protrusions 7 as it moves toward the connector 6.

In fig. 10 shows a top view of the connector 6.

In fig. 11 shows the cross section of the connector 6 at the level of the corrugated surface 9 while advancing the clamping latch 8 along the protrusions 7 and the reduction in diameter of the total clearance 11 at this point.

The utility model is used as follows: Through separate purse-string sutures on the right atrium, venous cannulas are installed and with their tips 3 with perforations 10, collective tunnels 4 and cutouts 5 extending from them are passed into the vena cava, after which they are crimped with wide turnstiles (braid) for complete drainage of blood patient in the IR circuit. To eliminate kinking, the housing 2 is reinforced with wire 1.

If there is a need to increase occlusion of the venous line caused by a mismatch in the inflow and outflow of blood along the main highways of the IR apparatus, which is accompanied by the collapse of the venous walls, the operator, with the fingers of the dominant hand, resolves the clamp retainer 8 towards connector 6 along the protrusions 7, than a decrease in blood flow velocity is achieved by reducing the diameter of the general lumen 11 due to additional compression of the corrugated surface 9.

After receiving the optimal rate of venous return to the IR circuit, the operation continues. Upon completion of all necessary operational manipulations, the cannulas are removed and must be disposed of.

The positive effect of the claimed technical solution consists not only in ease of use, but also in ensuring an optimal rate of venous return to the IR circuit during cannulation of vena cava, due to the possibility of regulating venous cannula occlusion without special additional devices.

Claims (1)

Venous cannula for drainage of the heart, containing a wire-reinforced body, which ends at one end with a tip having perforations, collective tunnels and cutouts extending from them, opening into the general lumen, and on the other with a connector for attaching to the heart-lung machine, characterized in that has ledges with a clamping clamp and a corrugated surface.

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