RU99972U1 - DEVICE FOR REPLACEMENT OF BILATERAL CATHETERS - Google Patents

Abstract

 A device for replacing catheters in the bile ducts, which is a rod that extends into the handle at its distal end, in the middle of the rod there is a screw thread for connection to a replaceable catheter, characterized in that the device is a tool kit consisting of a rod made hollow, and a conductor with a length exceeding the length of the rod by at least 2 times.

Description

The utility model relates to medicine, namely to minimally invasive endobiliary interventional surgery and can be used to replace biliary catheters of smaller diameter with a larger one in the surgical treatment of obstructive jaundice of various nature.

To replace catheters in the bile ducts, bougies of successively increasing diameter were used (Borisov A.E., Borisova NA, Verkhovsky BC Endobiliary interventions in the treatment of obstructive jaundice. St. Petersburg: Aesculapius. - 1997.- 152 p .; Dolgushin B.I., Avaliani M.V., Buidenok Yu.V. et al. Endobiliary interventional oncoradiology. M., 2004. - 224 p.). Such a technique did not allow replacing thin catheters with catheters with a diameter exceeding 17 Fr (5.7 mm.).

In connection with these shortcomings of the method using boughey professor Ivshin V.G. A device for replacing catheters is proposed, which is a monolithic rod passing into its handle at its distal end. A screw thread was made in the middle of the shaft for connection with a replaceable catheter (Ivshin V.G., Lukichev OD. Minimally invasive methods of decompression of the biliary tract in patients with obstructive jaundice. - Tula., - 2003. - P.60 - 61).

This device according to the closest technical nature is selected by us as a prototype.

The disadvantages of the prototype, according to the authors of the inventive device, are:

The insufficient length of the proximal part of the shaft, onto which the removed catheter is fixed, does not allow reliable control of the location of the device inside the bile ducts, which often leads to migration of the device from the lumen of the ducts, which, in turn, can lead to damage to the liver parenchyma with subsequent development of intraperitoneal bleeding and / or biliary peritonitis.

The lack of rigidity of the device makes it difficult to hold a larger diameter catheter inside the bile duct due to the resistance created by the parenchyma of the liver and the wall of the bile duct, which can lead to bending of the device inside the liver and its injury. Bending the device creates a risk of loss of contact between the device and the bile ducts.

For additional contrasting of the bile ducts during the procedure, it is necessary to remove the entire device from the catheter, since there is no channel for introducing a contrast medium, which lengthens the procedure and increases its invasiveness.

The objectives of the utility model are:

- holding a larger diameter catheter inside the bile ducts without the risk of losing contact of the device with the bile ducts;

- improving control over the location of the device inside the bile ducts;

- preventing migration of the device from the lumen of the ducts;

- improving the usability of the device;

The technical result of the utility model is to increase the length of the contact of the device with the lumen of the bile ducts, facilitating the introduction of contrast medium into the lumen of the bile ducts, and also giving the device sufficient rigidity.

The technical result is achieved in that the device for replacing catheters in the bile ducts is a tool kit consisting of a rod and a conductor. The rod passes into the handle at its distal end and has a screw thread in its middle for connection with a replaceable catheter. The rod is hollow. The length of the conductor exceeds the length of the rod by at least 2 times.

The salient features of the claimed utility model are:

- the implementation of the rod in the device for replacing catheters in the bile ducts with a hollow;

- the length of the conductor exceeds the length of the rod at least 2 times;

A causal relationship between the salient features and the result:

The implementation of the rod in the device for replacing catheters in the bile ducts with a hollow allows you to enter a conductor whose length exceeds the length of the device by more than 2 times, which increases the length of the contact of the device with the lumen of the bile ducts, which, in turn, improves control over the location of the device inside the bile ducts and prevents the device from migrating from the lumen of the ducts during the catheter replacement procedure.

The implementation of the device hollow also allows you to enter the contrast agent into the lumen of the bile ducts without removing the device from the catheter being replaced, which increases the usability of the device.

Due to the possibility of introducing a conductor, the device is stiffened enough to conduct a larger diameter catheter into the bile ducts.

Significant distinguishing features are new and increase the length of the device’s contact with the bile duct lumen, which improves control over the device’s location inside the bile duct and prevents the device from migrating from the lumen of the ducts during the catheter replacement procedure. Due to the possibility of introducing a conductor, the device is stiffened enough to hold a larger diameter catheter inside the bile ducts without the risk of losing contact between the device and the bile ducts.

The implementation of the device hollow also allows you to enter the contrast agent into the lumen of the bile ducts without removing the device from the catheter being replaced, which increases the usability of the device.

The essence of the utility model is illustrated by the drawing, where figure 1 schematically shows a device for replacing catheters in the bile ducts:

1 - the core of the device;

2 - pen;

3 - screw thread;

4 - clearance of the device;

5 - hard conductor;

A device for replacing catheters in the bile ducts works as follows:

A larger diameter catheter is placed on the device so that part of the shaft (1) proximal to the screw thread (3) remains free. The proximal part of the device is inserted into the lumen of the catheter being replaced. The catheter to be replaced is fixed to the device by screwing onto the screw thread (3) by turning the handle (2) so that the catheter to be removed is firmly fixed to the device. A contrast agent is introduced through the lumen of the rod (4) to contrast the bile ducts, the prevalence of the pathological process and the possibility of a catheter change are evaluated. Next, a conductor (5) is inserted into the lumen of the rod (4) so that its proximal part is located outside the removed catheter in the lumen of the bile ducts. A catheter of a larger diameter, which was previously located in the distal part of the device, is inserted into the cavity of the bile ducts along the removed catheter. Then, through the lumen of the newly installed catheter, the rod of the catheter changer is removed together with a smaller diameter catheter fixed on it. If necessary, during the procedure produce additional contrasting of the bile ducts through the lumen of the device. After monitoring the position of the newly installed catheter, the conductor is removed from the lumen of the bile ducts and catheter.

The device is made of stainless medical steel.

The production technology of a hollow steel bar is known and is used for the manufacture of similar devices intended for other purposes.

The production technology of uncoated rigid steel conductor is known and is used for the manufacture of similar conductors intended for other purposes.

The inventive utility model, in contrast to the prototype device, improves control over the location of the device inside the bile ducts and prevents the device from migrating from the lumen of the ducts. The utility model allows a larger diameter catheter to be inserted into the bile ducts without the risk of losing contact between the device and the bile ducts. The device also provides the introduction of contrast medium into the lumen of the bile ducts without removing the device from the catheter being replaced, which increases the usability of the device.

Claims (1)

A device for replacing catheters in the bile ducts, which is a rod that extends into the handle at its distal end, in the middle of the rod there is a screw thread for connection to a replaceable catheter, characterized in that the device is a tool kit consisting of a rod made of a hollow, and conductor with a length exceeding the length of the rod by at least 2 times.