Device for testing static hardness of elastic films made of bio-material

FIELD: testing equipment.

SUBSTANCE: device has body made with possible filling by working substance, pressing ring, pressure source and device for measuring pressure. Body is made with possible hermetic holding by pressing ring of researched bio-substance sample, and also with possible immersion in working substance. As working substance, warm physiological solution is used.

EFFECT: simplified construction, improved reliability, improved comfort of using device for research.

2 dwg

 

The invention relates to test equipment and can be used in any industry for scientific research, particularly in medicine and veterinary medicine.

A device for testing elastic films containing a hermetic cylindrical housing with a removable bottom, a threaded connection between them. Removable bottom provided with axial hole and are evenly distributed around the circumference of the holes in the deaf hemispherical recesses, the bottom has an annular sharp edge. The device includes a ring placed in the housing coaxially with the holes in the removable bottom so that the inner diameter of the ring is equal to the diameter of the holes in the removable bottom. Circular sharp edge of the bottom cut out a sample of the film and with rings press it to the bottom, the bottom is screwed into the housing. Working environment serves into the body under pressure, resulting in extrusion of the sample material in a hemispherical holes for fixing the film. And on the strength properties of the investigated material is judged by the pressure in the housing at the time of rupture of the sample (Copyright certificate №17004020, G 01 N 3/12, 1992)

The disadvantage of this device for testing elastic films (biomaterial) is that:

in this device the required environment in contact with the sample with only one hand, and to accurately measure the strength of various biological tissues requires certain conditions, which is optimal for them, close to natural on both sides. For some films require a certain gas composition, for other physiological fluid;

- the unreliability of fixing the sample, because when filling the tank corps loose clamping ring may shift and move the sample that will not happen fixing of the sample;

for the fluid under pressure must have a source of pressure type pump;

- threaded connection of the removable bottom and the enclosure does not provide sufficient tightness, i.e. decreases the accuracy of the measurements.

The technical challenge is to build simple, reliable, easy to use device for the study of static strength elastic films of the biomaterial, including biological tissues, suitable for closing defects, for example:

for defects of the abdominal wall skin, Dura mater, peritoneum, inguinal hernia treatment bag;

for defects of the pleural cavity of the pleura.

To achieve this, the technical result of the proposed device for the study of static strength elastic films of the biomaterial, which, unlike the closest analogue that has a ring to compress the investigated material without prior fixation of the tissue studied, contains clamping ring, ZAT is affected brackets with screws, for tight fastening of the sample of the biomaterial, which increases the measurement accuracy. The container body filled with a saline solution and unlike analogue has the opportunity of immersing the device in a physiological solution with the goal of creating optimal conditions for the studied films. To increase the pressure of the working environment, you can use any source of pressure, including you can use the pear from the apparatus for measuring blood pressure, and as a means of measuring the pressure gauge, you can also use the pressure gauge apparatus for measuring blood pressure.

Analysis of patent and technical literature has not revealed any similar device that confirms the compliance of the proposed technical solutions to the criterion "novelty".

The criterion of "inventive step" confirmed:

- the presence of the clamping ring with the possibility of fixing brackets with screws to a state of integrity, the result is a reliable fixation of the sample, i.e. increasing the measurement accuracy, as eliminated the shift pattern.

- possibility of immersing the entire device with the test material in a working environment, which also improves the accuracy of the measurements due to the fact that the sample is completely necessary to study the deposits environments.

Due to the aforementioned characteristics of the proposed device for measuring the static strength elastic films allows one to determine experimentally the strength of the investigated material in a production environment.

The invention is illustrated by drawings, where

1 shows a view of the device assembled with study material

figure 2 - the device is ready to experiment with attached pressure source - pear and gauge apparatus for measuring blood pressure.

The device consists of a housing (1), clamping ring (2), tighten the screws (3) brackets (4) to state integrity. In the bottom of the case are 2 fittings (5, 6), on the first fitting (5) is blown in the air and creates a pressure to the second fitting (6) is attached the pressure gauge (7), for example, from the apparatus for measuring blood pressure.

The device operates as follows.

Before installing the unit in the operating position to the fitting (5) is connected to the pressure source, to the fitting (6) is attached manometer, for example, from the apparatus for measuring blood pressure. The capacity of the housing (1) is filled with liquid or gas. On the flange of the housing (1) fit the investigated material (8), is pressed by the ring (2) and tightened with screws (3) to ensure air tightness. Research is performed by immersing the trojstva with the test material in the liquid medium, for example, a warm saline solution to create the necessary conditions for testing elastic films of biological tissues. The pressure source in the apparatus creates the desired pressure, the sample is maintained under pressure by a certain time. The strength of the film is determined by the ability to withstand the required pressure a certain time.

The proposed device, in particular, allows for outside the body of research on the durability of the elastic films of the biomaterial suitable for closure of defects, for example:

for defects of the abdominal wall skin, Dura mater, peritoneum, inguinal hernia treatment bag:

for defects of the pleural cavity of the pleura.

Example

It is necessary to investigate the strength of the hernial bag outside of the body. Before installing the unit in the operating position to the fitting (5) is connected to the pressure source - pear from the apparatus for measuring blood pressure, to the nozzle (6) is attached the pressure gauge from the same apparatus. The capacity of the housing (1) is filled with warm saline (37 degrees). On the flange of the housing (1) fit the hernia SAC (2 walls), taken during the operation of Greenacre. Pressed ring (2) and tightened with screws (3) to ensure air tightness. Research produced by immersing the device with grievin bag in warm f is Zoologicheskii solution to create optimal conditions for biological tissues. The blower apparatus is pressurized to 300 mm RT. Art. that exceeds the maximum known values of intra-abdominal pressure (Umeno and Sensilive,1989, the maximum numbers of intra-abdominal pressure is 260 mm RT. Art.).

The study lasts up to 2 hours with maintaining the pressure in the device with the test material and the temperature of the saline solution.

Thus, using the proposed device for determining the static strength of biological tissues outside the body, in particular hernial bag, it is possible to prove experimentally the ability of the latter to withstand intra-abdominal pressure. Therefore, demonstrates the ability to perform hernioplasty multilayer taking into account morphological and functional determinism musculo-aponeurotic tissue with preservation of scar-modified sections of muscles and aponeurosis, hernial bag, new from last duplicatory and more, if necessary, using it as a free graft. The positive qualities of this method autoplasty that strengthens the anterior and posterior wall of the inguinal canal remains the principle use for the plastic homogeneous structure of tissues, without tension, creates the possibility of using lipotropics, stretched tissue.

The proposed device can be is used to study the strength characteristics of any elastic films (including tissues) in various media: liquid, gaseous and with varying degrees of aggressiveness.

Device for the study of static strength elastic films of the biomaterial, comprising a housing with an opportunity to fill the working environment, clamping ring, pressure source and means for measuring pressure, characterized in that the casing is made with the possibility sealed zakrepleniya the holding ring of the sample of the biomaterial, and immersion in the working environment, which is used, for example, a warm saline solution.



 

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