RU198930U1 - Trocar for laparoscopic surgery - Google Patents

Abstract

The utility model relates to surgical instruments. A trocar for laparoscopic operations contains a sleeve with an inner diameter corresponding to traditional trocars of 5, 10, 12 mm or others, which is an elongated tubular body with a screw thread, the screw thread is made single-threaded, while the height of the thread is at least 2 mm, the thread pitch - not less than 6 mm, the profile of the thread is made rounded, the screw thread can be made of plastic trocar or other material. The thread material can be elastic to reduce tissue trauma. The technical result is to increase the stability of the trocar in the tissues, as well as to reduce the trauma to the tissues when using it.

Description

The technical field to which the utility model belongs

The utility model relates to surgical instrumentation, in particular to trocars, and can be used in all areas of medicine during laparoscopic operations and robotic-assisted surgery.

State of the art

Known trocars for operations, including laparoscopic (for example, RF patents for inventions No. 2247541, 2103929, 2322200, RF patents for useful models No. 146326, 86441, etc.), having various designs, the sleeve of which has a smooth body or body with thread-type thread, or screw thread.

The disadvantages of trocars with these types of bodies are their insufficient stability in the tissues, as well as the possibility of gas loss due to loose fixation of the trocars.

The closest in technical essence and the achieved positive effect to the claimed mechanism - prototype - is a trocar sleeve (RF patent for invention No. 2288655, class IPC A61B 17/34, publ. 10.12.2006), containing an elongated tubular body with a screw thread, which has a left or right winding and is multi-threaded, while the thread has a pitch of at least 4 mm and an angle of rise of at least 5 °, and the length of the section of the tubular body on which the screw thread is located is at least 1.2 times the outer diameter of the screw slicing.

The disadvantage of the known device is its insufficient stability in the tissues, which can lead to the movement of the trocar in the thickness of the abdominal wall, to the loss of carbon dioxide and the formation of metastases in the abdominal wall due to loose fixation of the trocars.

The difference in pressure in the abdominal cavity and in the environment leads to the fact that during the operation carbon dioxide, sometimes containing a suspension of tumor cells, escapes through the trocar insertion sites, creating the risk of developing port-site metastases, morcellas, etc.

Disclosure of a utility model

The task of the utility model is to create a trocar for laparoscopic and robotic-assisted operations of a convenient, simple and reliable design with increased tissue stability and low injury rate.

The technical result is to increase the stability of the trocar in tissues, as well as to reduce the trauma to tissues when using it.

The specified technical result is achieved by the fact that a trocar for laparoscopic operations contains a sleeve with an inner diameter corresponding to traditional trocars of 5, 10, 12 mm or others, which is an elongated tubular body with a screw thread, the screw thread is single-threaded, and the height of the thread is not less than 2 mm, thread pitch - not less than 6 mm, thread profile is made rounded, screw thread can be made of trocar plastic or other material. The thread material can be elastic to reduce tissue trauma.

The achievement of the technical result is ensured by the fact that the proposed device prevents the loss of carbon dioxide due to the presence of a large single-start thread, which provides a tight fixation to the abdominal wall. Such a tighter fixation, however, provides a reduced trauma due to the rounded profile of the coil and the cutting of elastic material, as well as by reducing the mobility of the trocar.

Brief Description of Drawings

FIG. 1 shows a general view of a trocar for laparoscopic operations.

FIG. 2 is an enlarged view of the thread profile.

The following designations are adopted in the figures: 1 - elongated tubular body, 2 - screw thread, 3 - head, 4 - thread turn, 5 - thread pitch, 6 - thread height, 7 - rounded turn profile.

Implementation of the utility model

The trocar for laparoscopic operations contains a trocar sleeve, which is an elongated tubular body 1, on the outer surface of which a single-threaded screw thread is made 2. The height (pos. 6 in Fig. 2) of the thread turn 4 is at least 2 mm, the pitch (pos. 5 in Fig. 2) threads - not less than 6 mm, the profile of the thread 4 is rounded 7 (see Fig. 2). The screw thread 2 is made of an elastic material, for example, a polymer material (plastic), rubber, etc. The trocar head is made in such a way that a standard rubber seal is suitable for it, designed to prevent gas loss through the sleeve, it is possible to install a valve in the head for injecting carbon dioxide.

To ensure a tight fixation of the trocar, the thread has a size of at least 2 mm and a pitch of at least 6 mm, this ensures a reliable position of the trocar in the tissues of the abdominal wall, an additional advantage is the limitation of the movement of trocars together with manipulators, which greatly facilitates the stages of surgical operations.

A single-start thread, in contrast to a multi-start thread, is "coarser" and, accordingly, additionally provides a tighter fixation. Such a tighter fixation reduces the mobility of the trocar, thereby reducing trauma. A significant contribution to the reduction of trauma is made by the rounded profile of the threads and the execution of cutting from elastic material: plastic, rubber, etc.

The trocar is used as follows.

After applying carboxyperitoneum to a pressure of 15 mm Hg. Art. a central standard trocar for a video camera is installed. A video camera is inserted, under visual control, the trocar under investigation is installed in the previously marked areas of the abdominal wall. To do this, the proposed trocar with a cutting instrument inserted into its lumen ("stylet", "nail") is introduced through the skin incisions of the abdominal wall. After reaching the thread, the trocar is screwed into the abdominal wall until the most tight fixation is achieved.

The advantages of the proposed technical solution:

1. Tight and reliable fixation of the trocar in the tissues;

2. Simplification and improvement of the usability of the trocar;

3. Reducing the trauma of abdominal tissues;

4. Manufacturability of manufacture, due to the possibility of using for the manufacture of mechanisms for 3D printing, stamping, casting, milling, etc .;

5. Reproducibility for small and large batch production;

6. Possibility of using standard equipment and instruments for laparoscopic and robot-assisted operations;

7. Ability to use standard seals to prevent loss of carbon dioxide through the trocar sleeve.

Thus, the claimed design of the trocar provides an increase in its stability in the tissues of the abdominal cavity, as well as a decrease in tissue trauma during its use.

Comparative analysis of the claimed utility model showed that the set of essential features of the claimed device is not known from the prior art and, therefore, meets the "Novelty" patentability condition.

The above information confirms the possibility of using the claimed device in medicine for laparoscopic operations and robotic-assisted surgery, and therefore meets the requirement of patentability "Industrial applicability".

Claims (2)

1. Trocar for laparoscopic operations, containing a sleeve, which is an elongated tubular body with a screw thread, characterized in that the screw thread is single-threaded, while the thread height is at least 2 mm, the thread pitch is at least 6 mm, the thread profile the thread is made rounded, and the screw thread is made of elastic material. 2. A trocar according to claim 1, characterized in that plastic or rubber is used as the elastic material of the screw thread.

Images