CN115887075A - Knee joint gap balance measuring device for total knee joint replacement - Google Patents
Knee joint gap balance measuring device for total knee joint replacement Download PDFInfo
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- CN115887075A CN115887075A CN202211568862.5A CN202211568862A CN115887075A CN 115887075 A CN115887075 A CN 115887075A CN 202211568862 A CN202211568862 A CN 202211568862A CN 115887075 A CN115887075 A CN 115887075A
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- knee joint
- measuring device
- air bag
- balance measuring
- joint gap
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Abstract
The invention discloses a knee joint gap balance measuring device for total knee joint replacement, which comprises an upper gasket and a lower gasket, wherein a spreading mechanism is arranged between the upper gasket and the lower gasket, a group of pressure sensors are densely distributed on the upper gasket, and the pressure sensors are connected with wires; the opening mechanism comprises an air bag cushion, an air pipe is connected to the air bag cushion, one end, away from the air bag cushion, of the air pipe is connected with an air pump, a check valve and an exhaust valve are installed on the air pipe, and the exhaust valve is arranged at a position between the check valve and the air bag cushion on the air pipe. The invention can realize accurate, efficient and comprehensive measurement of knee joint gap balance in the total knee joint replacement operation, and has simple structure and convenient operation.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a knee joint gap balance measuring device for total knee joint replacement.
Background
In knee joint diseases, knee joint osteoarthritis caused by degeneration of a knee joint is a main cause of leg and foot pain of old patients, the number of patients suffering from knee joint osteoarthritis is increased continuously along with the increasing aging of the population, and in the aspect of knee joint treatment, total knee joint replacement is one of the operation methods which are successful in treating knee joint diseases at present.
The knee joint replacement is an artificial knee joint prosthesis made according to the shape, structure and function of a human joint, the artificial knee joint prosthesis is implanted into a human body through a surgical operation, the joint pain of a patient is relieved, the joint function is recovered, the release of soft tissues around a tibial plateau is particularly noticed in the knee joint replacement, the knee joint is ensured to have proper tightness, and the pressure is in a proper range.
At present, most of the existing measuring devices are still difficult to realize the omnibearing measurement of the knee joint clearance in the total knee joint replacement operation. Therefore, a new knee joint gap balance measuring device for total knee replacement is needed to provide a good solution to the technical problem.
Disclosure of Invention
The present invention is directed to a knee joint gap balance measuring device for total knee replacement, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a knee joint gap balance measuring device for a total knee joint replacement operation comprises an upper gasket and a lower gasket, wherein a spreading mechanism is arranged between the upper gasket and the lower gasket, a group of pressure sensors are densely distributed on the upper gasket, and wires are connected to the pressure sensors;
the opening mechanism comprises an air bag cushion, an air pipe is connected to the air bag cushion, one end, away from the air bag cushion, of the air pipe is connected with an air pump, a check valve and an exhaust valve are installed on the air pipe, and the exhaust valve is arranged at a position between the check valve on the air pipe and the air bag cushion.
Furthermore, the airbag cushion is provided with three airbag cushions, the middle airbag cushion is a middle airbag cushion, a pair of side airbag cushions are arranged on two sides of the middle airbag cushion, each airbag cushion is independently connected with one air pipe, and the three air pipes are bundled together by one pipe sleeve.
Furthermore, a group of diaphragms are uniformly distributed in the middle air bag and the side air bags, and are used for fixing the upper side wall and the lower side wall of the air bags.
Further, the wires of a group of pressure sensors are bundled together by a wire bundle.
Further, a group of counter bores are arranged on the upper surface of the upper gasket, and the pressure sensors are bonded in the counter bores.
Further, a cover sheet is adhered to the upper surface of the upper gasket and covers the upper side of the pressure sensor.
Further, a gas flowmeter is installed on the gas pipe and is arranged between the check valve on the gas pipe and the gas pump.
Furthermore, nylon reinforcing ribs are distributed inside the middle air bag, the side air bags and the diaphragm.
Furthermore, the upper gasket and the lower gasket are made of hard silica gel, and the hardness of the upper gasket and the lower gasket is 68-75HA.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the pressure sensors are densely distributed on the upper gasket, and the sizes of gaps at all positions of the femur and the tibia can be distinguished by comparing the different pressures sensed by the pressure sensors at different positions, so that a doctor can comprehensively judge the gap between the femur and the tibia.
2. According to the invention, as the inflation quantity of the airbag cushion increases, the thickness of the airbag cushion increases, and the pressure value sensed by the pressure sensor also increases. By controlling the change of the inflation quantity, the pressure values of the multiple groups of pressure sensors are measured, and the doctor can be helped to comprehensively judge the dynamic change of the gap between the femur and the tibia.
3. In the invention, the left, middle and right air bag cushions are arranged independently, so that the thickness of the whole device can be uniformly increased in the inflation process. The diaphragm can improve the strength of the air bag and simultaneously ensure that the thickness of the air bag is uniformly increased everywhere in the inflating process.
4. According to the invention, the counter bore is formed in the upper gasket, and the pressure sensor is bonded in the counter bore, so that the pressure sensor can be prevented from excessively protruding outwards, the whole device is flatter, and the experimental operation is facilitated.
5. In the invention, the gas flowmeter measures the air bag introduced into the air bag, and the increase of the thickness of the air bag can be calculated according to the amount of introduced gas. Through analysis gasbag thickness increment and pressure sensor sense numerical value, can know thighbone and shin bone clearance balance more comprehensively.
6. In the invention, the upper gasket and the lower gasket are made of hard silica gel with the hardness of 68-75HA, so that the joint degree is high, the deformation degree is small while good support can be achieved, and the influence on the measurement result is small.
7. According to the invention, the nylon reinforcing ribs can improve the strength of the air bag.
In conclusion, the knee joint gap balance measuring device can realize accurate, efficient and comprehensive measurement of knee joint gap balance in the total knee joint replacement operation, and is simple in structure and convenient and fast to operate.
Drawings
FIG. 1 is a schematic structural diagram of a knee joint gap balance measuring device for total knee joint replacement surgery;
FIG. 2 is an exploded view of a knee joint gap balance measuring device for total knee arthroplasty;
FIG. 3 is a schematic structural diagram of a distraction mechanism of a knee joint gap balance measuring device for total knee arthroplasty;
FIG. 4 is an enlarged view of a portion of FIG. 3 at K;
FIG. 5 is a schematic view of the internal structure of a lateral air bag in a knee joint gap balance measuring device for total knee arthroplasty;
FIG. 6 is a schematic structural view of an upper spacer of a knee joint gap balance measuring device for total knee arthroplasty;
FIG. 7 is an enlarged view of a portion of FIG. 6 at L;
fig. 8 is a schematic structural view of an unbonded upper-gasket pressure sensor in a knee joint gap balance measuring device for total knee arthroplasty.
In the figure: 1. a distraction mechanism; 2. a middle air bag; 3. a side airbag; 4. a diaphragm; 5. pipe sleeve; 6. an air tube; 7. an exhaust valve; 8. a one-way valve; 9. an upper gasket; 10. a counter bore; 11. a pressure sensor; 12. a conduit; 13. a wire; 14. a cover sheet; 15. and (7) a lower gasket.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1 to 8, a knee joint gap balance measuring device for total knee joint replacement comprises an upper gasket 9 and a lower gasket 15, wherein a spreading mechanism 1 is arranged between the upper gasket 9 and the lower gasket 15, a group of pressure sensors 11 are densely distributed on the upper gasket 9, and wires 13 are connected to the pressure sensors 11;
The working principle of the embodiment is as follows:
when measurement is carried out, the whole device is stuffed between the gap between the femur and the tibia, the device is thin before being expanded through the expanding mechanism 1, the gap is not filled with the device, and the pressure sensed by the pressure sensor 11 on the upper gasket 9 is inaccurate. Then, the air pump work struts to the gasbag pad, and whole device thickness increases, and upper pad 9, lower gasket 15 are hugged closely the upper wall and the lower wall in clearance respectively, and pressure sensor 11 can accurately sense the extrusion force, and pressure signal passes through wire 13 and transmits the demonstration in the display device. Pressure sensor 11 is intensive on last gasket 9 and distributes, senses pressure size difference through comparing different positions pressure sensor 11, can distinguish thighbone and shin bone clearance size everywhere, and help the doctor judge thighbone and shin bone clearance comprehensively. As the amount of inflation of the airbag cushion increases, the thickness thereof increases, and the pressure value sensed by the pressure sensor 11 also increases. By controlling the change of the inflation quantity, the pressure values of the multiple groups of pressure sensors 11 are measured, and the doctor can comprehensively judge the dynamic change of the gap between the femur and the tibia.
The one-way valve 8 controls one-way air inlet of the airbag cushion, and the exhaust valve 7 is used for exhausting air after the test is finished.
Example 2: referring to fig. 3 to 7, a knee joint gap balance measuring device for total knee joint replacement is different from embodiment 1 in that three air bag cushions are provided, a middle air bag 2 is provided in the middle, a pair of side air bags 3 are provided at both sides of the middle air bag 2, each air bag is individually connected with one air tube 6, and the three air tubes 6 are bundled together by one tube sleeve 5.
A group of diaphragms 4 are uniformly distributed in the middle air bag 2 and the side air bags 3, and the diaphragms 4 are used for fixing the upper and lower side walls of the air bags.
The wires 13 of a group of pressure sensors 11 are bundled together by a conduit 12.
The working principle of the embodiment is as follows:
the air bag cushion is provided with a left part, a middle part and a right part which are independent from each other, so that the thickness of the whole device can be uniformly increased in the inflating process. The diaphragm 4 is used for improving the strength of the air bag and simultaneously ensuring that the thickness of the air bag is uniformly increased at each part in the inflation process. The pipe sleeve 5 tightens the air pipe 6 to avoid mutual winding. The conduit 12 tightens the lead wires 13 to prevent the lead wires 13 from being entangled.
Example 3: referring to fig. 2 and 6 to 8, a knee joint gap balance measuring device for total knee replacement differs from embodiment 1 in that a set of counter bores 10 is provided on the upper surface of an upper gasket 9, and a pressure sensor 11 is adhered in the counter bores 10.
A cover sheet 14 is bonded to the upper surface of the upper pad 9, and the cover sheet 14 covers the pressure sensor 11.
The working principle of the embodiment is as follows:
the upper gasket 9 is provided with the counter bore 10, and the pressure sensor 11 is bonded in the counter bore 10, so that the pressure sensor 11 can be prevented from protruding outwards excessively, the whole device is flatter, and the experimental operation is facilitated. The cover sheet 14 protects the pressure sensor 11.
Example 4: referring to fig. 1 to 3, a knee joint gap balance measuring device for total knee joint replacement is different from embodiment 1 in that a gas flow meter is installed on a gas pipe 6, and the gas flow meter is disposed between a check valve 8 on the gas pipe 6 and an air pump.
The working principle of the embodiment is as follows:
in the embodiment, the gas flowmeter is arranged to measure the air bag introduced into the air bag, and the increase of the thickness of the air bag can be calculated through the amount of introduced gas. Through analysis gasbag thickness increment and pressure sensor 11 sense numerical value, can understand thighbone and tibial clearance balance more comprehensively.
Example 5: referring to fig. 3 to 5, a knee joint gap balance measuring apparatus for total knee arthroplasty is different from embodiment 1 in that nylon reinforcing ribs are distributed inside a middle air bag 2, a side air bag 3 and a diaphragm 4.
The working principle of the embodiment is as follows:
the nylon strengthening rib can promote gasbag intensity in this embodiment.
Example 6: referring to fig. 1, a knee joint gap balance measuring device for total knee joint replacement is different from embodiment 1 in that the upper pad 9 and the lower pad 15 are made of hard silica gel, and the hardness of the upper pad 9 and the lower pad 15 is 68-75HA.
In this embodiment, the upper gasket 9 and the lower gasket 15 are made of hard silica gel with a hardness of 68-75HA, and have high adhesion degree, good support, small deformation degree and small influence on the measurement result.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The utility model provides a balanced measuring device in total knee arthroplasty knee joint clearance, includes upper pad (9) and lower pad (15), its characterized in that: a spreading mechanism (1) is arranged between the upper gasket (9) and the lower gasket (15), a group of pressure sensors (11) are densely distributed on the upper gasket (9), and the pressure sensors (11) are connected with wires (13);
prop opening mechanism (1) including the gasbag pad, be connected with trachea (6) on the gasbag pad, the one end that the gasbag pad was kept away from in trachea (6) links to each other with the air pump, install check valve (8) and discharge valve (7) on trachea (6), discharge valve (7) set up check valve (8) on trachea (6) and the position between the gasbag pad.
2. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: the air bag cushion is divided into three pieces, the middle air bag (2) is arranged in the middle, a pair of side air bags (3) is arranged on two sides of the middle air bag (2), each air bag is independently connected with one air pipe (6), and the three air pipes (6) are bundled together by one pipe sleeve (5).
3. The knee joint gap balance measuring device for total knee arthroplasty according to claim 2, wherein: a group of diaphragms (4) are uniformly distributed in the middle air bag (2) and the side air bags (3), and the diaphragms (4) are used for fixing the upper side wall and the lower side wall of the air bags.
4. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: the wires (13) of a group of pressure sensors (11) are bundled together by a conduit (12).
5. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: a group of counter bores (10) are formed in the upper surface of the upper gasket (9), and the pressure sensors (11) are bonded in the counter bores (10).
6. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: and a cover sheet (14) is adhered to the upper surface of the upper gasket (9), and the cover sheet (14) covers the pressure sensor (11).
7. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: and a gas flowmeter is arranged on the gas pipe (6), and is arranged between the check valve (8) on the gas pipe (6) and the gas pump.
8. The knee joint gap balance measuring device for total knee arthroplasty according to claim 3, wherein: the middle air bag (2), the side air bags (3) and the diaphragm (4) are internally distributed with nylon reinforcing ribs.
9. The knee joint gap balance measuring device for total knee arthroplasty according to claim 1, wherein: the upper gasket (9) and the lower gasket (15) are made of hard silica gel, and the hardness of the upper gasket (9) and the lower gasket (15) is 68-75HA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211568862.5A CN115887075A (en) | 2022-12-07 | 2022-12-07 | Knee joint gap balance measuring device for total knee joint replacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211568862.5A CN115887075A (en) | 2022-12-07 | 2022-12-07 | Knee joint gap balance measuring device for total knee joint replacement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115887075A true CN115887075A (en) | 2023-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211568862.5A Withdrawn CN115887075A (en) | 2022-12-07 | 2022-12-07 | Knee joint gap balance measuring device for total knee joint replacement |
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| Country | Link |
|---|---|
| CN (1) | CN115887075A (en) |
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2022
- 2022-12-07 CN CN202211568862.5A patent/CN115887075A/en not_active Withdrawn
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Application publication date: 20230404 |