RU184121U1 - STENT SELF-EXTENDING COLORECTAL - Google Patents

Abstract

The utility model relates to the field of medical technology, namely to endoscopy, and is intended to provide the possibility of resolving obstructive colonic obstruction by using a specially designed colorectal stent. The design of the proposed stent allows minimizing complications such as stent migration and tumor growth, which will reduce the likelihood of intra- and postoperative complications. Also, thanks to the presence of a special fixing thread, the ability to correct the stent and remove it is simplified. The combination of different techniques will make the work of the medical team more comfortable. The technical result is achieved due to the design of the device.

Description

The utility model relates to the field of medical technology, namely to endoscopy, and is intended to provide the possibility of resolving obstructive colonic obstruction by using a nitinol self-expanding stent. This makes it possible to resolve colonic obstruction without surgical aid and prepare the patient for radical surgery as soon as possible (Yi Zhang 2011, Jemal A, Siegel R, Xu J, Ward E (2010), Hyodo I (2010), Ohman U (1982), Deans GT (1994), Phillips RK (1985) Malignant large bowel obstruction. Br J Surg UP (2002), Watt AM (2007), Baik SH (2006), Ng KC (2006).

Currently, the installation of self-expanding colorectal stents for acute obstructive colonic obstruction, a universally recognized “gold standard” in the treatment of such patients, is an alternative to open surgery and is characterized by minimal postoperative pain and recovery time (Yi Zhang 2011, Jemal A, Siegel R, Xu J, Ward E (2010), Hyodo I (2010), Ohman U (1982), Deans GT (1994), Phillips RK (1985) Malignant large bowel obstruction. Br J Surg UP (2002), Watt AM (2007), Baik SH ( 2006), Ng KC (2006).

Today, there is a wide variety of colorectal stents used to treat obstructive colonic obstruction. However, all modifications have both advantages and disadvantages.

(http://www.medicalexpo.ru/proizvoditel-medicinskoj-produkcii/kolorektal-nyj-stent-9658.html)

When using uncoated, self-expanding stents, there is a real threat of occlusion due to tumor invasion through the cells. This disadvantage is offset by the low migration rate of uncovered stents.

In order to eliminate the possibility of tumor growth through the stent, special polymer coatings (polyethylene, polytetrafluoroethylene, silicone) are used, which cover the stent from the inside or outside. This modification allows us to exclude tumor growth, but significantly increases the likelihood of stent migration both in the proximal and in the distal direction, which is a significant drawback of this modification.

Partially coated stents have also been developed that combine the advantages and disadvantages of coated and uncoated stents.

In addition, during the installation of the colorectal stent, it is often difficult to position it, since most stents are shortened during deployment. And immediately after the installation of the stent, it becomes necessary to correct it by moving, both in the proximal and in the distal direction. Moving the stent by pulling on its free edge often leads to twisting deformation and does not always allow it to be moved to the ideal position with respect to the tumor.

Thus, there is an urgent need to create a new nitinol self-expanding colorectal stent, which allows its use in the treatment of obstructive colonic obstruction with a minimal risk of complications, such as stent migration and tumor growth.

The proposed stent is devoid of the disadvantages of the prototype and has no analogues.

The essence of the utility model is that the developed colorectal stent has uncovered ends and a middle part, which reduces the likelihood of migration. In this case, the coating from the inside of the stent will exclude its growth by a tumor. The stent is also equipped with a special thread with proximal and distal loops of the lasso type, which allows its correction both in the proximal and in the distal direction and, if necessary, removal by uniform folding in the lumen of the colon. The fixing thread is a monofilament synthetic non-absorbable sterile surgical suture material (prolene) and is made of the isotactic crystalline stereoisomer of polypropylene, a synthetic linear polyolefin. The molecular formula is (C3H6) n. PROLEN is delivered unpainted (transparent) or blue-colored phthalocyanine blue (color code number is 74160). The fixing thread may have various thicknesses and lengths. The fixing thread runs along the border of the inner and outer coatings along the entire length of the stent, going beyond its distal and proximal ends.

Application of the utility model allows to obtain the following technical result:

1. The absence of coating at the ends of the stent and coating outside on the middle part of the stent almost completely eliminates the risk of its dislocation.

2. The combination of external and internal coatings practically throughout the stent excludes the possibility of tumor growth.

3. The use of a fixing thread makes predictable compact folding of the stent and its correction in both the proximal and distal directions.

4. If it is necessary to remove the stent, the use of two lasso allows you to do this simply and safely.

This utility model is a complete device completely ready for use.

The design of the proposed device can minimize the invasiveness of endoscopic intervention, reduce the likelihood of intra- and postoperative complications. The combination of these qualities will make the work of the medical team more comfortable.

The device has wide functionality. It can be used for stenting of any part of the colon.

1 is a schematic illustration of a colorectal stent.

The technical result is achieved due to the design of the device.

1. The use of the uncovered ends of the stent (1, Fig. 1) and the uncovered middle part (2, Fig. 1).

2. The use of special internal coating (2, Fig. 1).

3. The presence of a special fixing thread (6, Fig. 1).

4. The presence of lasso loops (4, Fig. 1) at the proximal and distal ends of the thread to facilitate manipulation of the stent.

This device was used for stenting the colon in 20 patients. All patients achieved a positive result. No intra- or postoperative complications were observed. It should be noted a decrease in operation time.

Claims (1)

A self-expanding colorectal stent comprising a coating, characterized in that the coating is a silicone coating that excludes the possibility of germination and includes an internal coating applied throughout the stent from the inside, and an external coating applied throughout the outside of the stent, except for its middle part, the ends of the stent also free from coating, the stent is additionally equipped with radiopaque marks applied to the borders between the coated and uncoated parts, and a fixing thread with proximal with a distal and distal loops to facilitate manipulations, while the thread is fixed to the stent with the possibility of folding and correction in the proximal and distal directions and with the possibility of uniform folding to remove it.

Images