CN116785035A - Acetabular fossa pressure distribution measuring device and system for hip joint replacement - Google Patents
Acetabular fossa pressure distribution measuring device and system for hip joint replacement Download PDFInfo
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- CN116785035A CN116785035A CN202310631426.6A CN202310631426A CN116785035A CN 116785035 A CN116785035 A CN 116785035A CN 202310631426 A CN202310631426 A CN 202310631426A CN 116785035 A CN116785035 A CN 116785035A
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- pressure
- shell
- circuit board
- hip arthroplasty
- pressure distribution
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- 210000004394 hip joint Anatomy 0.000 title abstract description 5
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000011882 arthroplasty Methods 0.000 claims description 25
- 230000001681 protective effect Effects 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 230000001413 cellular effect Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 238000001356 surgical procedure Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 210000001624 hip Anatomy 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 4
- 210000004872 soft tissue Anatomy 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000002980 postoperative effect Effects 0.000 description 1
- 238000011541 total hip replacement Methods 0.000 description 1
Abstract
The invention provides an acetabular fossa pressure distribution measuring device and system for hip joint replacement, which are used for solving the problems of variability and uncertainty generated by surgery by means of subjective experience of doctors in the prior art, and providing objective basis for the manual operation of the doctors by using visual measurement data to assist the doctors in judgment. The measuring device comprises a shell, a circuit board, a plurality of pressure sensors and a plurality of cantilever beams; wherein, the shell is hemispherical, the upper part of the shell is provided with a round opening, and the inside of the shell is provided with a containing space; the pressure sensor is electrically connected with the circuit board through a wire; the plurality of cantilever beams are distributed at equal intervals along the periphery of the circular opening of the shell and extend to the bottom of the accommodating space inside the shell, the cantilever beams are provided with inner side surfaces and outer side surfaces, the plurality of pressure sensors are respectively fixed on the inner side surfaces of the plurality of cantilever beams in a one-to-one correspondence mode, and the shape of a space surrounded by the outer side surfaces of the plurality of cantilever beams is approximately matched with the shape of the circular head of the femoral prosthesis.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to an acetabular fossa pressure distribution measuring device and system for hip joint replacement.
Background
In total hip replacement surgery, soft tissue imbalance is one of the most important factors causing postoperative dislocation, however, the problem of soft tissue balance has not yet attracted enough attention from doctors. One of the main reasons is that in the current practice, the soft tissue balance mainly depends on the experience of doctors, and no specific measurement standard exists, so that the variability of actual operations of different doctors is relatively large, and the method is particularly difficult for doctors with less experience. To the inventors' knowledge, no related content has been addressed in the prior art to such technology.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to an acetabular fossa pressure distribution measuring device and system for hip arthroplasty, which solves the problems of variability and uncertainty in the prior art caused by surgery based on subjective experience of doctors, and uses visual measurement data to assist the doctors in judging, thereby providing objective basis for the operation of the doctors.
In order to achieve the above object, in one aspect, the present invention provides an acetabular fossa pressure distribution measurement apparatus for hip arthroplasty, comprising a housing, a circuit board, a plurality of pressure sensors, and a plurality of cantilever beams; wherein, the liquid crystal display device comprises a liquid crystal display device,
the shell is hemispherical or comprises a part of hemispherical, the upper part of the shell is provided with a round opening, and the inside of the shell is provided with a containing space for containing the circuit board, the pressure sensor and the cantilever beam;
the pressure sensor is electrically connected with the circuit board through a wire, so that the circuit board can supply power to the pressure sensor, and pressure data obtained by the pressure sensor can be transmitted to a microprocessor positioned on the circuit board;
the plurality of cantilever beams are distributed at equal intervals along the periphery of the circular opening of the shell and extend to the bottom of the accommodating space inside the shell, the cantilever beams are provided with inner side surfaces and outer side surfaces, the plurality of pressure sensors are respectively fixed on the inner side surfaces of the plurality of cantilever beams in a one-to-one correspondence mode, and the shape of a space surrounded by the outer side surfaces of the plurality of cantilever beams is approximately matched with the shape of the circular head of the femoral prosthesis.
Further, since the shell of the present invention is hemispherical or includes a portion of a hemisphere, it is approximately the same shape as the acetabular liner in an artificial hip prosthesis and resembles a bowl of a round bowl in daily life. In fact, the actual installation orientation of the artificial hip prosthesis is generally according to the orientation shown in fig. 4. However, for convenience of description, the terms upper, lower, top, and bottom are used in the sense that the housing is generally in a set-up state as shown in fig. 1, that is, a set-up state when the round bowl in daily life is normally used.
Further, the circuit board is located at the bottom of the accommodating space inside the housing.
Further, the pressure sensor is a resistive strain gauge.
Further, the microprocessor is an embedded programmable controller, such as FPGA, CPLD, single-chip microcomputer, etc., which is used to analyze and process data and control other modules on the circuit board.
Further, the circuit board also includes an internal power source for powering the modules on the circuit board.
Further, the circuit board also includes a switch for turning on or off the microprocessor.
Further, the circuit board also comprises an amplifying and converting module for amplifying and converting the pressure signal measured by the pressure sensor into a digital signal and transmitting the digital signal to the microprocessor.
Further, the circuit board further comprises a wireless transmission module, which is used for transmitting the pressure data measured by the pressure sensor to external equipment, such as intelligent terminal equipment of a desktop computer, a notebook computer, a tablet computer, a smart phone and the like.
Further, the wireless transmission module is a Bluetooth, wiFi, zig-Bee or cellular network (e.g. 3G, 4G, 5G) communication module, preferably a Bluetooth module.
Further, the number of cantilever beams is 6.
Further, the outer side surface of the cantilever beam is an arc-shaped surface and is used for being attached to the round head surface of the femoral prosthesis; the inner side surface of the cantilever beam is a plane and is used for being attached to the pressure sensor. The pressure sensor is favorable for better collecting the pressure of the circular head of the femoral prosthesis to the cantilever beam in the working process, so that the pressure and the distribution condition of the acetabular fossa are measured more accurately.
Further, the inner side surface of the cantilever beam has a width of 8-10 mm and a length of 6-8 mm, for example, a typical dimension of 8.8mm by 6.8mm. The ratio of the width of the inner side surface of the cantilever beam to the distance between adjacent cantilever beams is 0.6-1, which mainly takes into consideration the balance between the strength and deformation performance of the cantilever beams, the strength of the cantilever beams is insufficient to bear the pressure applied by the round head of the femoral prosthesis if the width is too small, and the proper deformation of the cantilever beams is not facilitated if the width is too large.
Further, the cantilever beam is preferably made of stainless steel, more preferably medical stainless steel, and has a thickness of 0.85-2 mm, and the shortest distance between the bottom end of the inner side surface of the cantilever beam and the inner wall of the shell is more than 1mm, more preferably more than 1.5mm. Through carrying out finite element analysis to the cantilever beam of stainless steel material, when stainless steel 0.85 mm's thickness bears 200N's pressure, vertical displacement is about 0.3mm, and the cantilever beam leaves 1 mm's clearance at least with the shell inner wall, can prevent like this that the vertical displacement of cantilever beam from contacting with the inner wall of shell when too big, leads to measuring inaccurately.
Further, the pressure sensor is fixed on the inner side surface of the cantilever beam in a inlaid or stuck mode.
Further, the acetabular fossa pressure distribution measuring device for hip arthroplasty also comprises a protective cover, wherein the protective cover is positioned above the circuit board and used for protecting the circuit board.
Further, the concave surface in the middle of the top of the protective cap is provided in order to better match the surface of the rounded head of the femoral prosthesis, facilitating better measurements.
Further, the material of visor is silica gel, and the periphery of visor bonds with the inner wall of shell through medical sealant to can play waterproof guard action of sealing to the circuit board.
On the other hand, the invention also provides an acetabular fossa pressure distribution measurement system for hip arthroplasty, which comprises an intelligent terminal besides the acetabular fossa pressure distribution measurement device for hip arthroplasty, wherein the intelligent terminal comprises:
the wireless receiving module is used for receiving the pressure data sent by the measuring device;
the data processing module is used for processing the pressure data; the method comprises the steps of,
and the display module is used for displaying the pressure and distribution condition of the acetabular fossa.
Further, the intelligent terminal is integrated electronic computer equipment with data receiving, processing and displaying functions, such as a desktop computer, a notebook computer, a tablet computer or a smart phone.
The acetabular fossa pressure distribution measuring device and system for hip arthroplasty of the invention have at least the following beneficial technical effects:
(1) The measuring system can display the pressure and distribution condition of the acetabular fossa in real time in hip joint replacement operation, and solves the problem that doctors rely on hand feeling and experience to adjust soft tissue balance;
(2) The measuring device has the advantages of simple structure, low cost and convenient operation, and the special cantilever beam design and the pressure sensor arrangement mode enable the measuring device to be well attached to and contacted with the round head of the femoral prosthesis, so that pressure data can be acquired more accurately;
(3) According to the measuring device, the circuit board is arranged at the bottom of the accommodating space in the shell, and the medical sealant is adopted for bonding and sealing, so that the waterproof protection effect can be achieved, and the safety of the device is improved.
Drawings
FIG. 1 is a schematic view of an exploded construction of an acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty according to a preferred embodiment of the invention;
FIG. 2 is a schematic view of the structure of a cantilever beam of an acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty according to a preferred embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of an acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty according to a preferred embodiment of the invention;
FIG. 4 is a schematic illustration of the combination of an acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty and a femoral prosthesis according to a preferred embodiment of the invention;
fig. 5 is a schematic diagram of the acetabular fossa pressure distribution measurement system for use in hip arthroplasty according to a preferred embodiment of the invention.
Detailed Description
The following examples of the present invention are described in detail, and are given by way of illustration of the present invention, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1-4, in a preferred embodiment, the acetabular fossa pressure distribution measurement apparatus for hip arthroplasty of the invention comprises a housing 1, a circuit board 2, six pressure sensors 3, six cantilever beams 4, and a protective cover 5; wherein, the liquid crystal display device comprises a liquid crystal display device,
the housing 1 is hemispherical or comprises a part of hemispherical shape, the upper part of the housing is provided with a circular opening, and the interior of the housing is provided with a containing space for containing the circuit board 2, the pressure sensor 3 and the cantilever beam 4;
the pressure sensor 3 and the circuit board 2 are electrically connected through a wire (not shown in the figure), so that the circuit board 2 can supply power to the pressure sensor 3, and pressure data obtained by the pressure sensor 3 can be transmitted to a microprocessor on the circuit board 2;
six cantilever beams 4 are equidistantly distributed along the periphery of the circular opening of the shell 1 and extend towards the bottom of the accommodating space inside the shell 1, the cantilever beams 4 are provided with an inner side surface 41 and an outer side surface 42, the six pressure sensors 3 are respectively fixed on the inner side surfaces 41 of the six cantilever beams 4 in a one-to-one correspondence manner, and the space shape surrounded by the outer side surfaces 42 of the six cantilever beams 4 is approximately matched with the shape of the circular head 6 of the femoral prosthesis.
The circuit board 2 is located at the bottom of the accommodation space inside the housing 1.
The pressure sensor 3 is a resistive strain gauge.
The microprocessor is an embedded programmable controller, such as FPGA, CPLD, single-chip microcomputer, etc., which is used to analyze the processed data and control other modules on the circuit board 2.
The circuit board 2 also includes an internal power source for powering the modules on the circuit board 2.
The circuit board 2 also includes a switch for switching the microprocessor on or off.
The circuit board 2 further comprises an amplifying and converting module for amplifying and converting the pressure signal measured by the pressure sensor 3 into a digital signal and transmitting the digital signal to the microprocessor.
The circuit board 2 further includes a wireless transmission module, which is configured to transmit the pressure data measured by the pressure sensor 3 to an external device, such as a smart terminal device, such as a desktop computer, a notebook computer, a tablet computer, and a smart phone. The wireless transmission module is a Bluetooth module.
The outer side surface 42 of the cantilever beam 4 is an arc-shaped surface and is used for being attached to the surface of the round head 6 of the femoral prosthesis; the inner side surface 41 of the cantilever beam 4 is planar for engagement with the pressure sensor 3. This facilitates the pressure sensor 3 to better collect the pressure of the circular head 6 of the femoral prosthesis against the cantilever beam 4 during operation, thereby more accurately measuring the pressure and distribution of the acetabular fossa.
The width w of the inner side surface 41 of the cantilever beam 4 is 8-10 mm and the length l is 6-8 mm, in this embodiment the dimensions are 8.8mm by 6.8mm. The ratio of the width w of the inner side surface 41 of the cantilever beam 4 to the spacing g between adjacent cantilever beams is 0.6-1, mainly in view of the balance between the strength and deformability of the cantilever beam 4, too small a width w will not be sufficient to withstand the pressure exerted by the rounded head 6 of the femoral prosthesis, and too large a width w will not be beneficial for the cantilever beam 4 to deform properly.
The cantilever beam 4 is made of stainless steel, the thickness of the cantilever beam is 0.85-2 mm, and the shortest distance d between the bottom end of the inner side surface 41 of the cantilever beam 4 and the inner wall of the shell is more than 1.5mm. Through carrying out finite element analysis to the cantilever beam 4 of stainless steel material, when stainless steel 0.85 mm's thickness bears 200N's pressure, vertical displacement is about 0.3mm, and cantilever beam 4 leaves 1.5 mm's clearance at least with shell 1 inner wall, can prevent like this that cantilever beam 4's vertical displacement from contacting with shell 1's inner wall when too big, leads to measuring inaccuracy.
The pressure sensor 3 is fixed to the inner side surface 41 of the cantilever beam 4 by means of a inlay.
The protective cover 5 is located above the circuit board 2 for protecting the circuit board 2. The top middle of the protective cap 5 has a concave surface in order to better match the surface of the rounded head 6 of the femoral prosthesis, facilitating better measurements. The protective cover 5 is made of silica gel, and the periphery of the protective cover 5 is adhered to the inner wall of the shell 1 through medical sealant, so that the protective cover can play a role in sealing and waterproof protection of the circuit board 2.
As shown in fig. 5, in a preferred embodiment, the acetabular fossa pressure distribution measurement system for hip arthroplasty of the invention includes, in addition to the acetabular fossa pressure distribution measurement apparatus for hip arthroplasty described above, an intelligent terminal 7, the intelligent terminal 7 including:
the wireless receiving module is used for receiving the pressure data sent by the measuring device;
the data processing module is used for processing the pressure data; the method comprises the steps of,
and the display module is used for displaying the pressure and distribution condition of the acetabular fossa.
The intelligent terminal 7 is an integrated electronic computer device with data receiving, processing and displaying functions, such as a desktop computer, a notebook computer, a tablet computer or a smart phone.
As shown in fig. 4-5, when the round head 6 of the femoral prosthesis is in contact with the six cantilever beams 4 of the measuring device, the pressure sensor 3 embedded on the cantilever beams 4 is deformed due to the tension of muscles and ligaments, the amplifying and converting module amplifies and converts the pressure signal measured by the pressure sensor 3 into a digital signal, the digital signal is transmitted to the microprocessor, then the microprocessor analyzes and converts the received digital signal into pressure through an internal algorithm, the pressure is transmitted to the intelligent terminal 7 through the wireless transmission module, the intelligent terminal 7 intuitively displays the pressure and distribution condition of the acetabular fossa to a doctor through a software interface, and the doctor is assisted in judging, so that an objective basis is provided for the operation of the doctor.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by a person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. An acetabular fossa pressure distribution measuring device for hip arthroplasty is characterized by comprising a shell, a circuit board, a plurality of pressure sensors and a plurality of cantilever beams; wherein, the liquid crystal display device comprises a liquid crystal display device,
the shell is hemispherical or comprises a part of hemispherical, the upper part of the shell is provided with a round opening, and the inside of the shell is provided with a containing space for containing the circuit board, the pressure sensor and the cantilever beam;
the pressure sensor is electrically connected with the circuit board through a wire, so that the circuit board can supply power to the pressure sensor, and pressure data obtained by the pressure sensor can be transmitted to a microprocessor positioned on the circuit board;
the cantilever beams are distributed at equal intervals along the periphery of the circular opening of the shell and extend to the bottom of the accommodating space inside the shell, the cantilever beams are provided with inner side surfaces and outer side surfaces, the pressure sensors are respectively fixed on the inner side surfaces of the cantilever beams in a one-to-one correspondence mode, and the space shape surrounded by the outer side surfaces of the cantilever beams is approximately matched with the shape of the circular head of the femoral prosthesis.
2. The acetabular socket pressure distribution measurement apparatus for use in hip arthroplasty of claim 1 wherein the circuit board is located at a bottom of the receiving space inside the shell.
3. The acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty of claim 2 wherein the pressure sensor is a resistive strain gauge; the microprocessor is an embedded programmable controller.
4. The acetabular socket pressure distribution measurement apparatus for use in hip arthroplasty of claim 3 wherein the circuit board further comprises:
an internal power supply for powering the modules on the circuit board;
a switch for turning on or off the microprocessor;
the amplifying and converting module is used for amplifying and converting the pressure signal measured by the pressure sensor into a digital signal and transmitting the digital signal to the microprocessor; the method comprises the steps of,
and the wireless transmission module is used for transmitting the pressure data measured by the pressure sensor to external equipment.
5. The acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty of claim 4 wherein the wireless transmission module is a bluetooth, wiFi, zigbee or cellular network communication module.
6. The acetabular socket pressure distribution measurement apparatus for use in hip arthroplasty of claim 1 wherein the number of cantilever beams is 6.
7. The acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty of claim 6 wherein the lateral surface of the cantilever beam is arcuate for conforming to a rounded head surface of a femoral prosthesis; the inner side surface of the cantilever beam is a plane and is used for being attached to the pressure sensor.
8. The acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty of claim 7 wherein the medial surface of the cantilever beam has a width of 8-10 mm and a length of 6-8 mm; the cantilever beam is made of stainless steel, the thickness of the cantilever beam is 0.85-2 mm, and the shortest distance between the bottom end of the inner side surface of the cantilever beam and the inner wall of the shell is more than 1mm; the pressure sensor is fixed on the inner side surface of the cantilever beam in a inlaid or stuck mode.
9. The acetabular fossa pressure distribution measurement apparatus for use in hip arthroplasty of claim 1 further comprising a protective cover over the circuit board for protecting the circuit board; the middle of the top of the protective cover is provided with a concave surface; the protective cover is made of silica gel, and the periphery of the protective cover is bonded with the inner wall of the shell through medical sealant.
10. An acetabular socket pressure distribution measurement system for use in hip arthroplasty, the measurement system comprising, in addition to the acetabular socket pressure distribution measurement device for use in hip arthroplasty of any of claims 1-9, an intelligent terminal comprising:
the wireless receiving module is used for receiving the pressure data sent by the measuring device;
the data processing module is used for processing the pressure data; the method comprises the steps of,
and the display module is used for displaying the pressure and distribution condition of the acetabular fossa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631426.6A CN116785035A (en) | 2023-05-31 | 2023-05-31 | Acetabular fossa pressure distribution measuring device and system for hip joint replacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631426.6A CN116785035A (en) | 2023-05-31 | 2023-05-31 | Acetabular fossa pressure distribution measuring device and system for hip joint replacement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116785035A true CN116785035A (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310631426.6A Pending CN116785035A (en) | 2023-05-31 | 2023-05-31 | Acetabular fossa pressure distribution measuring device and system for hip joint replacement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116785035A (en) |
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2023
- 2023-05-31 CN CN202310631426.6A patent/CN116785035A/en active Pending
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