CN212118306U - Active suction type operation gas filtering device - Google Patents
Active suction type operation gas filtering device Download PDFInfo
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- CN212118306U CN212118306U CN201820486539.6U CN201820486539U CN212118306U CN 212118306 U CN212118306 U CN 212118306U CN 201820486539 U CN201820486539 U CN 201820486539U CN 212118306 U CN212118306 U CN 212118306U
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Abstract
The utility model discloses an active suction type operation gas filtering device, belonging to the field of medical gas filters. The utility model discloses a gas filtering device, including joint, hose, gas filter and miniature air pump, the joint is connected with gas filter's air inlet through the hose, and gas filter's the side of admitting air or giving vent to anger is located to miniature air pump. The utility model discloses set up miniature air pump on original gas filter's basis, utilized miniature air pump initiative suction operation to produce gas to utilize gas filter to filter operation gas, need not to use dedicated negative pressure air exhaust equipment, occupy small, easy operation is convenient, has greatly made things convenient for the normal clear of operation, has avoided the pollution of the harmful gas of emission to the environment in the operation.
Description
Technical Field
The utility model relates to a medical gas filter, more specifically say, relate to an active suction formula operation gas filter equipment.
Background
With the development of medical technology, tools such as electrosurgical equipment, laser scalpel, ultrasonic scalpel and the like are widely used in surgery, so that modern medical work is more convenient and effective, and meanwhile, surgical smoke generated in the surgery process also brings serious health hidden dangers to medical staff. The operation smoke not only obstructs the sight of the operating personnel, but also releases toxic and harmful substances into the air, and causes the symptoms of headache, eye and mucosa inflammation and the like of the operating room personnel.
Surgical smoke is a gaseous substance, also known as aerosol, produced during surgery by high frequency electrocautery knives, laser knives, ultrasonic knives, high speed drills, saw blades, instrument burrs that destroy and vaporize tissue proteins and fats during surgery. Authorities such as the national institute of occupational safety and health, the national organization for standardization, etc. have confirmed the potential harm of surgical smoke to human health. However, most surgeons, nurses, operating room staff and management neglect the health hazards of surgical smoke.
Surgical smoke is composed of 95% water or water vapor and 5% cellular debris present in particulate form. These particles contain the following main ingredients: blood and tissue debris, harmful chemicals, active viruses, active cells, inactive particles, mutation-inducing substances, and the like. The main chemical components in the smoke are hydrocarbons, nitriles, organic amines, aldehydes and the like. The research shows that the chemical components can cause symptoms such as headache, dizziness, lacrimation, nausea, cough, tracheitis, asthma and the like. There is now sufficient evidence that smoke generated using ESU and laser contains active virus within a certain energy setting. Particularly, in laparoscopic surgery, electrocoagulation and ultrasonic knife-driven cutting are performed in an anoxic environment, proteins and fat in tissues are not completely combusted, a large amount of toxic substances and partially free active cells and bacteria viruses are generated, aerosol is formed in abdominal cavities, the visual field is affected clearly, secondary damage is caused to the body of a patient, gas needs to be continuously discharged along with the operation, and the gas is released to an operating room without any treatment to cause air pollution, so that the health of medical care personnel and the patient is seriously damaged, and the health problems of the medical care personnel are increased. The protein contains chemical elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and the like, and after the protein is combusted, the protein can be treated with CO2、H2O、NO2Or N2、P2O5、SO2The gases are dispersed in the air to generate a large amount of polycyclic aromatic hydrocarbon compounds, wherein the polycyclic aromatic hydrocarbon compounds comprise benzopyrene and other substances which are strong to gastric cancer, intestinal cancer and liver cancer, and CO which is a product formed by carbon, hydrogen and oxygen2、H2O is non-toxic, but NO2、P2O5、SO2The gases are toxic and can cause damage to the respiratory system, carcinogenic substances generated after the newly discovered proteins are burnt have the common point of aminopyridine groups, and the carcinogenic benzidine has been confirmed to have strong mutagenicity due to the existence of aromatic amino groups, so the outstanding problems need to be solved in time.
In order to solve the above problems, many surgical gas filters have been introduced into the market in recent years, for example, the applicant proposed chinese patent No. zl201620422153.x, 5/10/2016, entitled: the application relates to a surgical gas filter for a laparoscope, which comprises a filter shell and a filter element arranged in the filter shell, wherein one end of the filter shell is connected with a joint, the other end of the filter shell is provided with an exhaust port, the filter element is of a hollow columnar structure, one end of the filter element is communicated with the joint, and the other end of the filter element is closed; a gas circulation channel is arranged between the side surface of the filter element and the inner wall of the filter shell and is communicated with the exhaust port; the gas enters the middle part of the filter element from the joint, and flows into the gas circulation channel along the radial direction of the filter element in a dispersing way, and is discharged from the exhaust port. The application facilitates the operation, effectively filters the waste gas discharged in the operation process, and protects the health of medical staff and patients and the environment of the operating room from being polluted by harmful gas. However, the existing surgical gas filter needs to be used in cooperation with a hospital suction device, surgical smoke is discharged by the suction device and filtered by the gas filter, so that the existing surgical gas filter is high in use dependence, and the suction device is large in size, so that more devices and pipelines are needed in the surgical process, and more inconvenience is brought to the surgery.
Disclosure of Invention
1. Technical problem to be solved by the utility model
The utility model aims to overcome the above-mentioned not enough that current operation gas filter exists, provide an initiative suction formula operation gas filtration device, adopt the technical scheme of the utility model, set up miniature air pump on original gas filter's basis, utilize the gas that miniature air pump initiative suction operation produced to utilize gas filter to filter operation gas, need not to use dedicated negative pressure air exhaust equipment, occupy smallly, easy operation is convenient, has greatly made things convenient for the normal clear of operation, has avoided the pollution of the harmful gas of emission to the environment in the operation.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model relates to an active suction type operation gas filtering device, which comprises a joint, a hose and a gas filter, wherein the joint is connected with the gas inlet of the gas filter through the hose, and the device also comprises a micro air pump which is arranged at the gas inlet side or the gas outlet side of the gas filter; when the micro air pump is arranged on the air inlet side of the air filter, the air suction port of the micro air pump is connected with the joint, and the air outlet of the micro air pump is connected with the air inlet of the air filter; when the micro air pump is arranged on the air outlet side of the air filter, the air suction port of the micro air pump is connected with the air outlet of the air filter, and the air outlet of the micro air pump is communicated with the atmosphere.
Furthermore, the micro air pump is a direct-current diaphragm pump.
Furthermore, the hose is also provided with a clamp for clamping the hose.
Furthermore, the gas filter is a gas filter I, the gas filter I comprises an end cover, a shell, a first filter sheet, a second filter sheet, a third filter sheet and a fourth filter sheet, the shell is of a barrel-shaped structure, the shell is connected with the end cover to form a filter shell, the first filter sheet, the second filter sheet, the third filter sheet and the fourth filter sheet are all arranged in the filter shell, and the first filter sheet, the second filter sheet, the third filter sheet and the fourth filter sheet are all sleeve structures which are sleeved together in sequence, the opening end of the fourth filter sheet is connected with the air inlet I on the end cover, the third filter sheet is sleeved outside the fourth filter sheet, the second filter disc is sleeved on the outer side of the third filter disc, the first filter disc is sleeved on the outer side of the second filter disc, and the shell is provided with an air outlet I.
Furthermore, the first filter sheet, the second filter sheet, the third filter sheet and the fourth filter sheet are made of PTFE filter membranes or formed by pressing particles.
Furthermore, the filtration precision of first filter, second filter, third filter and fourth filter gradually increases from inside to outside, wherein, the fourth filter is used for filtering the material more than 2um of diameter, the third filter is used for filtering the material more than 1um of diameter, the second filter is used for filtering the material more than 0.5um of diameter, first filter is used for filtering the material below 0.2um of diameter.
Furthermore, the gas filter is a gas filter II, the gas filter II comprises a shell, iodine-containing solution filtering cotton, a filtering membrane and a sponge filtering layer, the two ends of the shell are respectively provided with a gas inlet II and a gas outlet II, and the iodine-containing solution filtering cotton, the filtering membrane and the sponge filtering layer are sequentially filled in the shell from the gas inlet II to the gas outlet II.
Furthermore, the filtering membrane is made of a material which is air-permeable and water-impermeable.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:
(1) the utility model discloses an active suction type operation gas filtering device, which is provided with a micro air pump on the basis of the original gas filter, the micro air pump is arranged at the air inlet side or the air outlet side of the gas filter, when the micro air pump is arranged at the air inlet side of the gas filter, the air suction port of the micro air pump is connected with a joint, the air outlet of the micro air pump is connected with the air inlet of the gas filter, when the micro air pump is arranged at the air outlet side of the gas filter, the air suction port of the micro air pump is connected with the air outlet of the gas filter, and the air outlet of the micro air pump is communicated with; the micro air pump is used for actively pumping the gas generated by the operation, the gas filter is used for filtering the operation gas, a special negative pressure air pumping device is not needed, the occupied size is small, the operation is simple and convenient, the normal operation of the operation is greatly facilitated, the pollution of harmful gas discharged in the operation to the environment is avoided, and the influence and the harm of medical staff engaged in medical service on physical and mental health are thoroughly eliminated;
(2) the active suction type operation gas filtering device of the utility model adopts a miniature direct current diaphragm pump as a miniature air pump, and has the advantages of small volume, low noise, maintenance-free and the like;
(3) the active suction type surgical gas filtering device of the utility model is provided with the clamp for clamping the hose, which can conveniently control the on-off of gas suction, and has simple operation and flexible use;
(4) the utility model discloses an active suction type operation gas filtering device, its gas filter is gas filter I, and gas filter I adopts multilayer filter plate to overlap in proper order and forms the filter assembly together, adopts multilayer filtration, and the filter effect is better, and the gas permeability is good, and is higher to the material filter fineness in the gas;
(5) the utility model discloses an active suction type surgical gas filtering device, wherein a first filter plate, a second filter plate, a third filter plate and a fourth filter plate of a gas filter I are all made of PTFE filter membranes or formed by particle pressing, the filtering performance is stable, and the filtering time is long;
(6) the utility model discloses an active suction type surgical gas filtering device, the filtering precision of the first filter plate, the second filter plate, the third filter plate and the fourth filter plate of the gas filter I is gradually increased from inside to outside, the layers are filtered, the efficiency of filtering and intercepting materials is high, and the filtering performance is excellent;
(7) the utility model discloses an active suction formula operation gas filter equipment, its gas filter are gas filter II, and gas filter II has iodine-containing solution and filters cotton, filtration membrane and sponge filter layer three-layer filtration structure, has advantages such as simple structure, convenient operation, filtration efficiency height, filter cycle length are long, can filter the medium in the gas reliably and steadily.
Drawings
Fig. 1 is a schematic structural view of an active suction type surgical gas filtering device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of an active suction type surgical gas filtering device according to embodiment 2 of the present invention;
fig. 3 is a schematic structural view of an active suction type surgical gas filtering device according to embodiment 3 of the present invention;
fig. 4 is a schematic structural view of an active suction type surgical gas filtering device according to embodiment 5 of the present invention;
the reference numerals in the schematic drawings illustrate:
1. a joint; 2. a hose; 3. a micro air pump; 4. a clip; 5. a gas filter I; 51. an air inlet I; 52. an end cap; 53. a housing; 54. a first filter sheet; 55. a second filter sheet; 56. a third filter sheet; 57. a fourth filter sheet; 58. an air outlet I; 6. a gas filter II; 61. an air inlet II; 62. filtering the iodine-containing solution; 63. a filtration membrane; 64. a sponge filter layer; 65. and an air outlet II.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
Referring to fig. 1, the active suction type surgical gas filtering device of the present embodiment includes a connector 1, a hose 2, a gas filter, and a micro air pump 3, wherein the connector 1 is connected to an air inlet of the gas filter through the hose 2, and the micro air pump 3 is disposed on an air inlet side of the gas filter; specifically, the air suction port of the micro air pump 3 is connected with the joint 1, the air discharge port of the micro air pump 3 is connected with the air inlet of the air filter, and the micro air pump 3 can be connected with the joint 1 and the air filter by adopting the hose 2. During the use, connect whole gas filtering device through joint 1, start miniature air pump 3, miniature air pump 3 pumps out the operation gas, and to gas filter, discharge after filtering, through having set up miniature air pump 3 on original gas filter's basis, utilize the gas of 3 initiative suction operations of miniature air pump to produce, and utilize gas filter to filter operation gas, need not to use dedicated negative pressure pumping equipment, it is small to occupy, and easy operation is convenient, the normal clear of operation has greatly been made things convenient for, the pollution of the harmful gas of emission to the environment in having avoided the operation.
In this embodiment, the micro air pump 3 is preferably a dc diaphragm pump, which can be powered by 12V or 24V, and has the advantages of small size, low noise, and no maintenance. As shown in fig. 1, in this embodiment, a clip 4 for clipping the hose 2 is further disposed on the hose 2, and the clip 4 can be connected to the hose 2, so as to conveniently control the on/off of the air suction, and is simple to operate and flexible to use. In addition, the gas filter is a gas filter i 5, the gas filter i 5 includes an end cover 52, a housing 53, a first filter 54, a second filter 55, a third filter 56, and a fourth filter 57, the housing 53 is a barrel-shaped structure, the housing 53 and the end cover 52 are connected to form a filter housing, the first filter 54, the second filter 55, the third filter 56, and the fourth filter 57 are all installed in the filter housing, the first filter 54, the second filter 55, the third filter 56, and the fourth filter 57 are all sleeve structures sequentially sleeved together, an open end of the fourth filter 57 is connected with an air inlet i 51 on the end cover 52, the third filter 56 is sleeved outside the fourth filter 57, the second filter 55 is sleeved outside the third filter 56, the first filter 54 is sleeved outside the second filter 55, the shell 53 is provided with an air outlet I58. The end cover 52 is provided with a ring groove for installing the first filter sheet 54, the second filter sheet 55, the third filter sheet 56 and the fourth filter sheet 57, and a certain gap is left between two adjacent filter sheets to facilitate the gas flow. After the miniature air pump 3 sent the operation gas into gas filter I5, gas carries out the successive layer through fourth filter 57, third filter 56, second filter 55 and first filter 54 in proper order and filters, discharges from gas outlet I58 at last, adopts the multilayer filtration, and it is efficient to filter the interception material, and filtering quality is good, and the filter effect is better, and the gas permeability is good, and is higher to the material filter fineness in the gas. The first filter sheet 54, the second filter sheet 55, the third filter sheet 56 and the fourth filter sheet 57 are all made of PTFE filter membranes or formed by pressing particles, and because a large number of gap micropores are formed by the combination of the PTFE filter membranes or the particles, the gaps are used for filtering substances in gas, so that the filtering performance is stable, and the filtering time is long. In the present embodiment, the filtering precision of the first filter 54, the second filter 55, the third filter 56 and the fourth filter 57 gradually increases from inside to outside, wherein the fourth filter 57 is used for filtering substances with a diameter of 2um or more, the third filter 56 is used for filtering substances with a diameter of 1um or more, the second filter 55 is used for filtering substances with a diameter of 0.5um or more, and the first filter 54 is used for filtering substances with a diameter of 0.2um or less.
Example 2
Referring to fig. 2, the basic structure of the active suction type surgical gas filtering device of this embodiment is the same as that of embodiment 1, except that: the micro air pump 3 is arranged at the air outlet side of the air filter, specifically, the air suction port of the micro air pump 3 is connected with the air outlet of the air filter, the air outlet of the micro air pump 3 is communicated with the atmosphere, and the micro air pump 3 and the air filter can be connected by adopting a hose 2. The micro air pump 3 works to generate negative pressure in the air filter, so that the operation air is sucked into the air filter for filtering and then discharged.
Example 3
Referring to fig. 3, the active suction type surgical gas filtering device of the present embodiment includes a connector 1, a hose 2, a gas filter, and a micro air pump 3, wherein the connector 1 is connected to an air inlet of the gas filter through the hose 2, and the micro air pump 3 is disposed on an air inlet side of the gas filter; specifically, the air suction port of the micro air pump 3 is connected with the joint 1, the air discharge port of the micro air pump 3 is connected with the air inlet of the air filter, and the micro air pump 3 can be connected with the joint 1 and the air filter by adopting the hose 2. During the use, connect whole gas filtering device through joint 1, start miniature air pump 3, miniature air pump 3 pumps out the operation gas, and to gas filter, discharge after filtering, through having set up miniature air pump 3 on original gas filter's basis, utilize the gas of 3 initiative suction operations of miniature air pump to produce, and utilize gas filter to filter operation gas, need not to use dedicated negative pressure pumping equipment, it is small to occupy, and easy operation is convenient, the normal clear of operation has greatly been made things convenient for, the pollution of the harmful gas of emission to the environment in having avoided the operation.
In this embodiment, the micro air pump 3 is preferably a dc diaphragm pump, which can be powered by 12V or 24V, and has the advantages of small size, low noise, and no maintenance. As shown in fig. 3, in this embodiment, the hose 2 is further provided with a clip 4 for clipping the hose 2, and the clip 4 can be connected to the hose 2, so that the on-off of the air suction can be conveniently controlled, and the operation is simple and the use is flexible. In addition, the gas filter is a gas filter ii 6, the gas filter ii 6 includes a casing, iodine-containing solution filtering cotton 62, a filtering membrane 63 and a sponge filtering layer 64, the two ends of the casing are respectively provided with a gas inlet ii 61 and a gas outlet ii 65, and the iodine-containing solution filtering cotton 62, the filtering membrane 63 and the sponge filtering layer 64 are sequentially filled in the casing from the gas inlet ii 61 to the gas outlet ii 65. After the micro air pump 3 sends the operation air into the air filter II 6, the air is filtered by the iodine-containing solution filtering cotton 62, the filtering membrane 63 and the sponge filtering layer 64 in sequence and is finally discharged from the air outlet II 65, and the micro air pump has the advantages of simple structure, convenience in operation, high filtering efficiency, long filtering period and the like, and can stably and reliably filter media in the air; and, the iodine-containing solution filtering cotton 62 is adopted for preliminary filtering, so that the sterilizing and disinfecting effects are achieved. The filtering membrane 63 is preferably made of a material that is air-permeable and water-impermeable, so that air can pass through the filtering membrane easily and liquid can be prevented from flowing out.
Example 4
Referring to fig. 4, the basic structure of the active suction type surgical gas filtering device of this embodiment is the same as that of embodiment 3, except that: the micro air pump 3 is arranged at the air outlet side of the air filter, specifically, the air suction port of the micro air pump 3 is connected with the air outlet of the air filter, the air outlet of the micro air pump 3 is communicated with the atmosphere, and the micro air pump 3 and the air filter can be connected by adopting a hose 2. The micro air pump 3 works to generate negative pressure in the air filter II 6, so that the operation air is sucked into the air filter for filtering and then discharged.
The utility model discloses an active suction formula operation gas filter equipment has set up miniature air pump on original gas filter's basis, utilizes the gas that miniature air pump initiative suction operation produced to utilize gas filter to filter operation gas, need not to use dedicated negative pressure air exhaust equipment, occupy small, easy operation is convenient, has greatly made things convenient for the normal clear of operation, has avoided the pollution of the harmful gas of emission to the environment in the operation.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without creatively designing the similar structural modes and embodiments to the technical solutions, they should belong to the protection scope of the present invention.
Claims (8)
1. An active suction type surgical gas filtering device comprises a joint (1), a hose (2) and a gas filter, wherein the joint (1) is connected with a gas inlet of the gas filter through the hose (2), and the active suction type surgical gas filtering device is characterized in that: the air filter also comprises a micro air pump (3), wherein the micro air pump (3) is arranged on the air inlet side or the air outlet side of the air filter; when the micro air pump (3) is arranged on the air inlet side of the air filter, the air suction port of the micro air pump (3) is connected with the joint (1), and the air outlet of the micro air pump (3) is connected with the air inlet of the air filter; when the micro air pump (3) is arranged at the air outlet side of the air filter, the air suction port of the micro air pump (3) is connected with the air outlet of the air filter, and the air outlet of the micro air pump (3) is communicated with the atmosphere.
2. An active suction surgical gas filtration device according to claim 1, wherein: the miniature air pump (3) is a direct-current diaphragm pump.
3. An active suction surgical gas filtration device according to claim 2, wherein: the hose (2) is also provided with a clamp (4) for clamping the hose (2).
4. An active suction surgical gas filtration device according to claim 1, 2 or 3, wherein: the gas filter is a gas filter I (5), the gas filter I (5) comprises an end cover (52), a shell (53), a first filter sheet (54), a second filter sheet (55), a third filter sheet (56) and a fourth filter sheet (57), the shell (53) is of a barrel-shaped structure, the shell (53) and the end cover (52) are connected into a filter shell, the first filter sheet (54), the second filter sheet (55), the third filter sheet (56) and the fourth filter sheet (57) are all arranged in the filter shell and are of sleeve structures which are sequentially sleeved together, the open end of the fourth filter sheet (57) is connected with a gas inlet I (51) on the end cover (52), and the third filter sheet (56) is sleeved on the outer side of the fourth filter sheet (57), the second filter sheet (55) is sleeved on the outer side of the third filter sheet (56), the first filter sheet (54) is sleeved on the outer side of the second filter sheet (55), and an air outlet I (58) is formed in the shell (53).
5. An active suction surgical gas filtration device according to claim 4, wherein: the first filter sheet (54), the second filter sheet (55), the third filter sheet (56) and the fourth filter sheet (57) are all made of PTFE filter membranes or formed by pressing particles.
6. An active suction surgical gas filtration device according to claim 5, wherein: the filter fineness of first filter (54), second filter (55), third filter (56) and fourth filter (57) increase gradually from inside to outside, wherein, fourth filter (57) are used for filtering the more than 2 um's of diameter material, third filter (56) are used for filtering the more than 1 um's of diameter material, second filter (55) are used for filtering the more than 0.5 um's of diameter material, first filter (54) are used for filtering the less than 0.2 um's of diameter material.
7. An active suction surgical gas filtration device according to claim 1, 2 or 3, wherein: gas filter be gas filter II (6), this gas filter II (6) filter silk floss (62), filtration membrane (63) and sponge filter layer (64) including casing, iodine-containing solution, the both ends of casing be equipped with air inlet II (61) and II (65) of gas outlet respectively, iodine-containing solution filter silk floss (62), filtration membrane (63) and sponge filter layer (64) fill in the casing in proper order to II (65) of gas outlet by air inlet II (61).
8. An active suction surgical gas filtration device according to claim 7, wherein: the filtering membrane (63) is made of a material which is air-permeable and water-impermeable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820486539.6U CN212118306U (en) | 2018-04-08 | 2018-04-08 | Active suction type operation gas filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820486539.6U CN212118306U (en) | 2018-04-08 | 2018-04-08 | Active suction type operation gas filtering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212118306U true CN212118306U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820486539.6U Expired - Fee Related CN212118306U (en) | 2018-04-08 | 2018-04-08 | Active suction type operation gas filtering device |
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| Country | Link |
|---|---|
| CN (1) | CN212118306U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113520569A (en) * | 2021-06-26 | 2021-10-22 | 合肥德易电子有限公司 | Cavity smoke eliminating device for abdominal operation |
-
2018
- 2018-04-08 CN CN201820486539.6U patent/CN212118306U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113520569A (en) * | 2021-06-26 | 2021-10-22 | 合肥德易电子有限公司 | Cavity smoke eliminating device for abdominal operation |
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Granted publication date: 20201211 |