CN215228854U - Pressure measuring device and system for patella replacement - Google Patents
Pressure measuring device and system for patella replacement Download PDFInfo
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- CN215228854U CN215228854U CN202022856245.8U CN202022856245U CN215228854U CN 215228854 U CN215228854 U CN 215228854U CN 202022856245 U CN202022856245 U CN 202022856245U CN 215228854 U CN215228854 U CN 215228854U
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Abstract
The utility model provides a pressure measuring device and a system for patellar replacement, which comprises a shell, a circuit board and a strain sensing mechanism; the shell is used for accommodating the circuit board and the strain sensing mechanism, and the shape of the shell is approximately the same as that of the patellar prosthesis; the shell comprises a first shell and a second shell, the outer surface of the first shell is provided with an arc-shaped stress surface, and the inner surface of the first shell is provided with a stress column; the circuit board comprises a power supply, a microprocessor, an analog-to-digital converter and a wireless communication module; the strain sensing mechanism comprises a strain sensor and a sensor fixing seat, the strain sensor is fixed on the sensor fixing seat and electrically connected with the circuit board, and a groove matched with the stress column is formed in the sensor fixing seat, so that the force applied to the arc-shaped stress surface is transmitted to the sensor fixing seat through the stress column, and the strain sensor is deformed and responds.
Description
Technical Field
The utility model belongs to the field of medical equipment, in particular to a pressure measurement device and system for patella replacement art.
Background
Total Knee Arthroplasty (TKA) is one of the most effective surgical methods for treating severe or terminal knee arthropathy at present, and can effectively relieve pain, correct deformity, improve knee joint function and improve life quality of patients. With the widespread development of TKA, patellofemoral joint-related problems are gradually gaining importance. Research finds that the incidence rate of pain in the front of the knee after TKA is 4-49%, and the reasons are mainly related to the movement track of the patellofemoral joint, the contact pressure of the patellofemoral joint, the inclination of the patella, the dislocation of the patella, the position of the patella and the like. Therefore, patellar processing is particularly important in TKA. The existing method for treating the patella in the TKA mainly comprises patella replacement, patella plasty, patella denervation and the like, and researches show that the patella replacement has an especially obvious effect on solving the pain in the front of the knee after the TKA. However, there is currently no suitable device or product for pressure measurement in patella replacement surgery to assist the physician in making a more accurate determination, and therefore there is a certain difficulty in selecting a patella prosthesis.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of the prior art, the utility model aims to provide a pressure measurement device, system and method for patellar replacement art, mainly used doctor is to the measurement of patellar joint contact pressure when the patellar replaces, and measuring range is 0 ~ 500N, can reflect the pressure condition of patellar joint furthest, provides the judgement basis for the suitable patellar prosthesis of doctor selection, has solved because of the improper postoperative problem such as pain before knee that produces of prosthesis selection.
In order to achieve the above objects, in one aspect, the present invention provides a pressure measuring device for patellar replacement, comprising a housing, a circuit board, and a strain sensing mechanism; wherein the content of the first and second substances,
the shell is used for accommodating the circuit board and the strain sensing mechanism, and the shape of the shell is approximately the same as that of the patellar prosthesis; the shell comprises a first shell and a second shell, the outer surface of the first shell is provided with an arc-shaped stress surface, and the inner surface of the first shell is provided with a stress column;
the circuit board comprises a power supply, a microprocessor, an analog-to-digital converter (ADC) and a wireless communication module;
the strain sensing mechanism comprises a strain sensor and a sensor fixing seat, the strain sensor is fixed on the sensor fixing seat and is electrically connected with the circuit board, and a groove matched with the stress column is formed in the sensor fixing seat, so that the force applied to the arc stress surface is transferred to the sensor fixing seat through the stress column, and the strain sensor is deformed and responds.
Further, the force-bearing columns are four and are distributed approximately uniformly along the circumference of the inner surface of the first housing, i.e. the four force-bearing columns are distributed approximately in a square shape. This kind of mode of setting is mainly because the bellied structural feature in middle of the kneecap coaster is sunken, both sides, and pressure source mainly is both sides bulge, so the utility model discloses a four pressure points that are the square come four sensors of overall arrangement in order to reach optimum measurement effect, two sensors of each overall arrangement of both sides bulge of kneecap coaster, this kind of bilateral symmetry overall arrangement can more accurately react the both sides pressure condition. On the contrary, if three sensors are arranged according to a regular triangle, the measurement area is small, the effect of bilateral symmetry arrangement cannot be achieved, the patellar pressure condition is difficult to be completely reflected, and the measurement precision is poor; if six sensors are arranged according to a regular hexagon, although the effect of symmetrical arrangement can be achieved, the cost is increased due to the increase of the number of the sensors, and other auxiliary electronic elements are also increased, the data acquisition amount is increased, and the algorithm is relatively more difficult to implement.
Further, the first housing has a pointing member on a periphery of an outer surface thereof for indicating a mounting direction of the pressure measuring device. The four stress columns are distributed in pairwise symmetry relative to a connecting line between the pointing piece and the center of the first shell. Thus, when the pressure measuring device is installed, the pointing component is only required to be aligned with the extending direction of the middle recess of the patella pulley, and two sensors can be respectively arranged on the two side convex parts of the patella pulley.
Further, the force-bearing column has a cambered surface, preferably a hemisphere or comprising a portion of a hemisphere, at its end contacting the sensor mount.
Further, the sensor holder is substantially cross-shaped, having four cantilever beams, each cantilever beam having a recess at an end remote from the center of the sensor holder, the recess matching the shape of the end of the force-bearing column contacting the sensor holder, i.e. also having a curved surface, preferably hemispherical or comprising a part of a hemispherical shape. The design has the advantages that the two cambered surfaces are in point contact, the friction force is small, the loss of the force in the conduction process is small, and therefore the measurement accuracy is higher. In contrast, if the two planes are designed to be in contact, the friction force is large, and the force is easily dispersed when being conducted, thereby resulting in low measurement accuracy.
Further, the groove is provided with a notch at one end far away from the center of the sensor fixing seat. The open slot is adopted because the cantilever beams can deform when being subjected to external force, each cantilever beam can bend in different degrees, and the open slot can slightly slide along the slot when the cantilever beams bend, so that the measurement is more accurate. On the contrary, if the cantilever beam is designed into a general closed arc-shaped groove, when the cantilever beam is bent by an external force, the pressure column theoretically slides downwards along the groove, but the closed arc-shaped groove can cause the pressure column to be incapable of sliding slightly, so that static friction force can be generated between the pressure column and the groove, the static friction force can be increased along with the increase of the external force, and the measurement accuracy is further and further poor.
Further, the strain sensor is a resistive strain gauge. A resistive strain gauge is a pressure sensor, which is a device that senses a pressure signal and converts the pressure signal into a usable output electrical signal according to a certain rule. When the resistance strain gauge is deformed by pressure, an output electric signal is transmitted to a microprocessor and/or an analog-digital converter on the circuit board for processing.
Furthermore, the number of the resistance type strain gauges is four, and the four resistance type strain gauges are respectively fixed on the four cantilever beams.
Further, the pressure measuring range of each resistance type strain gauge is 0-200N, preferably 0-150N, so that the pressure distributed to each resistance type strain gauge is within the respective measuring range when the pressure measuring device is subjected to the pressure of 500N, and the measuring accuracy is ensured.
Furthermore, the center of the sensor fixing seat is thicker, one end, close to the stress column, of the cantilever beam is also thicker, and the beam body of the cantilever beam is thinner, so that the cantilever beam deforms when being stressed. The thickness of the cantilever beam can be adjusted to make the pressure displacement of the cantilever beam at the stress column be 0.001-0.003 mm/N, preferably 0.002mm/N, namely when the stress column is stressed by 100N pressure, the displacement in the vertical direction is 0.2 mm.
Further, the circuit board is located between the first shell and the sensor fixing seat.
Furthermore, the power supply is electrically connected with electronic equipment such as a microprocessor, an analog-to-digital converter, a wireless communication module and the like on the circuit board and supplies power to the electronic equipment. The power source may be a button cell, a dry cell or a rechargeable lithium cell, preferably a button cell.
Further, the microprocessor is an embedded programmable controller, such as an FPGA, a CPLD, a single chip, and the like, and is used for analyzing and processing data and controlling other modules on the circuit board.
Further, the wireless communication module is a Bluetooth, WiFi or Zig-Bee communication module, and preferably a Bluetooth module.
Further, the circuit board also comprises a power switch. Preferably, the power switch is a magnetic attraction type switch.
Further, the second shell has a groove matched with the sensor fixing seat on the inner surface of the second shell, and the groove is used for placing the sensor fixing seat.
Further, the second housing has a support column on an inner surface thereof for supporting the circuit board above the sensor holder to prevent the circuit board from contacting the sensor holder, resulting in deformation of the sensor holder, thereby causing measurement errors.
Further, the second housing has a protrusion on its outer surface for engaging a groove of the patella section during surgery, thereby securing the device to the patella section.
Further, the seam between the first shell and the second shell is filled and sealed by medical-grade silica gel, so that the device is waterproof. The utility model discloses utilize silica gel to fill the outside fit-up gap of whole device, reach sealed purpose, whole device is inside to be kept apart completely with the outside, can not have the air convection, and such benefit lies in guaranteeing to operate the in-process, and liquid can not enter into the device and flow back again after inside to the human body, stops the infection risk. And the silica gel material is soft in texture and good in elasticity, and cannot greatly influence the test and measurement of the device.
On the other hand, the utility model also provides a pressure measurement system for patellar replacement, besides the pressure measurement device for patellar replacement, the pressure measurement system also comprises a wireless data receiving module, a data processing module and a display module; the wireless data receiving module is in communication connection with a wireless communication module of the pressure measuring device and used for receiving data generated by the pressure measuring device.
Further, the wireless data receiving module, the data processing module and the display module are integrated in an intelligent terminal, for example, an integrated electronic device with data receiving, processing and displaying functions, such as a desktop computer, a notebook computer, a tablet computer or a smart phone.
In still another aspect, the present invention further provides a method for using the pressure measurement system, i.e. a method for measuring the pressure of the patellar articular contact surface in the patella replacement surgery. Existing patella replacement procedures first resect a portion of the patella valgus and then replace the patellar prosthesis. The utility model discloses measure the method of patellar articular contact surface pressure is after the excision part patella turns up, before the patellar prosthesis of reloading, tests patellar articular contact surface pressure to supplementary doctor selects suitable patellar prosthesis to install, including following step:
step one, installing a pressure measuring device on the remaining patella cross section of a patient after the resected part of the patella is everted;
adjusting the angle between the femur and the tibia of the patient, observing pressure changes at different angles by a doctor, and recording the measured pressure data by an intelligent terminal;
and step three, taking out the pressure measuring device, analyzing the measured pressure data through the intelligent terminal, and assisting a doctor to select a proper patellar prosthesis for installation.
Further, the different angles in the second step at least include angles of 30 °, 60 °, 90 °, 120 °, and the like.
The utility model discloses a beneficial technological effect embodies in following several aspects at least:
(1) the utility model discloses a pressure measurement device appearance adopts imitative false body gasket, and shell overall structure is unanimous with patella false body appearance, and inside cantilever beam and strain sensor's combination then adopts, and measuring range is 0 ~ 500N, can measure the pressure of patella joint contact surface accurately.
(2) The utility model discloses a strain sensor's overall arrangement adopts the square distribution according to patella coaster structure, corresponding to the protruding department in patella coaster both sides, and two sensors are respectively distributed symmetrically, can more accurate measurement pressure effectively, avoid complicated structure and algorithm simultaneously, therefore can save the cost, raise the efficiency.
(3) The utility model discloses a atress department is arc groove structure on the cantilever beam, and is the opening groove, and not confined recess, is favorable to reducing frictional force and avoids producing the static friction, thus has further ensured measurement accuracy.
(4) The utility model discloses a pressure measurement device's waterproof medical grade silica gel that adopts is filled sealedly, and the leakproofness is good, and the operation in-process does not have the infection risk.
Drawings
Fig. 1 is a schematic structural diagram of a pressure measurement device according to a preferred embodiment of the present invention;
fig. 2 is a schematic view of another angle of the pressure measuring device according to a preferred embodiment of the present invention;
fig. 3 is an exploded view of a pressure measuring device according to a preferred embodiment of the present invention;
fig. 4 is a schematic diagram of the internal structure of the pressure measuring device according to a preferred embodiment of the present invention;
fig. 5 is a schematic view of the inner surface structure of the first housing of the pressure measuring device according to a preferred embodiment of the present invention;
fig. 6 is a schematic structural view of a sensor holder of a pressure measuring device according to a preferred embodiment of the present invention;
fig. 7 is a schematic view of a pressure measurement device according to a preferred embodiment of the present invention mounted on a cross-section of a patella;
fig. 8 is a schematic view of a pressure measuring device according to a preferred embodiment of the present invention in a measuring state;
fig. 9 is a schematic view of the patella prosthesis mounted on the patella cross section according to a preferred embodiment of the present invention.
Detailed Description
The following embodiments of the present invention will be described in detail, and the following embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
In a preferred embodiment, as shown in fig. 1-9, the patella replacement pressure measurement device of the present invention includes a housing 1, a circuit board 2, and a strain sensing mechanism 3. The shell 1 is used for accommodating the circuit board 2 and the strain sensing mechanism 3, and the shape of the shell is approximately the same as that of the patellar prosthesis 6; the housing 1 comprises a first housing 11 and a second housing 12, the outer surface of the first housing 11 has an arc-shaped force-bearing surface 111, and the inner surface of the first housing 11 has a force-bearing column 112. The circuit board 2 includes a power supply, a microprocessor, an analog-to-digital converter (ADC) and a wireless communication module. The strain sensing mechanism 3 comprises a strain sensor 32 and a sensor fixing seat 31, wherein the strain sensor 32 is fixed on the sensor fixing seat 31 and electrically connected with the circuit board 2, and a groove 312 matched with the stress column 112 is formed in the sensor fixing seat 31, so that the force applied to the arc-shaped stress surface 111 is transmitted to the sensor fixing seat 31 through the stress column 112, and the strain sensor 32 is deformed and responds.
The force-bearing columns 112 are four and are distributed substantially evenly along the circumference of the inner surface of the first housing 1, i.e. the four force-bearing columns 112 are distributed substantially in a square. This kind of mode of setting is mainly because the bellied structural feature in middle of the patella coaster is sunken, both sides, and pressure source mainly is both sides bulge, so the utility model discloses a four pressure points that are the square come four strain sensor 32 of overall arrangement in order to reach optimum measurement effect, two strain sensor 32 of each overall arrangement of both sides bulge of patella coaster, this kind of bilateral symmetry overall arrangement can more accurately react the both sides pressure condition. On the contrary, if three sensors are arranged according to a regular triangle, the measurement area is small, the effect of bilateral symmetry arrangement cannot be achieved, the patellar pressure condition is difficult to be completely reflected, and the measurement precision is poor; if six sensors are arranged according to a regular hexagon, although the effect of symmetrical arrangement can be achieved, the cost is increased due to the increase of the number of the sensors, and other auxiliary electronic elements are also increased, the data acquisition amount is increased, and the algorithm is relatively more difficult to implement.
The first housing 11 has a pointing member 113 on the periphery of the outer surface thereof for indicating the installation direction of the pressure measuring device. The four force-bearing columns 112 are symmetrically distributed in pairs relative to a connecting line of the pointing element 113 and the center of the first shell 11. In this way, during the assembly of the pressure measuring device, it is only necessary to align the pointing element 113 in the direction of extension of the medial concavity of the patella pulley, so that two strain sensors 32 are arranged on each of the two lateral convex portions of the patella pulley.
The force-receiving column 112 has a hemispherical arc surface at one end thereof contacting the sensor holder 31. The sensor fixing base 31 is approximately cross-shaped, and has four cantilever beams 311, each cantilever beam 311 has a groove 312 at one end far away from the center of the sensor fixing base 31, and the groove 312 matches with the shape of one end of the force-bearing column 112 contacting the sensor fixing base 31, that is, has a hemispherical cambered surface. The design has the advantages that the two cambered surfaces are in point contact, the friction force is small, the loss of the force in the conduction process is small, and therefore the measurement accuracy is higher. In contrast, if the two planes are designed to be in contact, the friction force is large, and the force is easily dispersed when being conducted, thereby resulting in low measurement accuracy.
The recess 312 has a cutout at an end away from the center of the sensor holder 31. The reason for adopting such an open slot is that the cantilever beams 311 will deform when subjected to an external force, each cantilever beam 311 will bend to different degrees, and the pressure column 112 on the first housing 11 can slightly slide along the groove 312 while the cantilever beams 311 bend, so that the measurement is more accurate. On the contrary, if the cantilever beam is designed into a general closed arc-shaped groove, when the cantilever beam is bent by an external force, the pressure column theoretically slides downwards along the groove, but the closed arc-shaped groove can cause the pressure column to be incapable of sliding slightly, so that static friction force can be generated between the pressure column and the groove, the static friction force can be increased along with the increase of the external force, and the measurement accuracy is further and further poor.
The strain sensor 32 is a resistive strain gauge. A resistive strain gauge is a pressure sensor, which is a device that senses a pressure signal and converts the pressure signal into a usable output electrical signal according to a certain rule. When the resistance strain gauge is deformed by pressure, an output electric signal is transmitted to a microprocessor and/or an analog-digital converter on the circuit board 2 for processing. The number of the resistance type strain gauges is four, and the four resistance type strain gauges are respectively fixed on the four cantilever beams 311. In this embodiment, the pressure measurement range of the resistive strain gauge is 0 to 150N.
The center of the sensor fixing seat 31 is thicker, the end of the cantilever beam 311 close to the stress column 112 is also thicker, and the beam body of the cantilever beam 311 is thinner, so that the cantilever beam 311 deforms when being stressed. The thickness of the cantilever beam 311 can be adjusted to make the pressure displacement at the force-bearing column 112 be 0.005mm/N, i.e. the displacement in the vertical direction when the force-bearing column is pressed by 100N is 0.5 mm.
The circuit board 2 is located between the first housing 11 and the sensor holder 31. The power supply is electrically connected with and supplies power to electronic equipment such as a microprocessor, an analog-to-digital converter, a wireless communication module and the like on the circuit board 2. The power supply is a button cell. The microprocessor is an embedded programmable controller, such as an FPGA, a CPLD, a single chip, etc., and is used to analyze and process data and control other modules on the circuit board 2. The wireless communication module is a Bluetooth module. Circuit board 2 still includes switch, and switch adopts magnetism to inhale the formula switch.
The second housing 12 has a groove 121 on its inner surface to be matched with the sensor holder 31 for placing the sensor holder 31. The second housing 12 has a supporting column 122 on its inner surface for supporting the circuit board 2 above the sensor holder 31 to prevent it from contacting the sensor holder 31, which causes deformation of the sensor holder 31 and thus causes measurement error. The second housing 12 has a protrusion 123 on its outer surface for engaging the groove 42 on the patella section 41 during surgery to secure the device on the patella section 41.
The seam between the first shell 11 and the second shell 12 is filled and sealed with medical grade silica gel for waterproofing the device. The utility model discloses utilize silica gel to fill the outside fit-up gap of whole device, reach sealed purpose, whole device is inside to be kept apart completely with the outside, can not have the air convection, and such benefit lies in guaranteeing to operate the in-process, and liquid can not enter into the device and flow back again after inside to the human body, stops the infection risk. And the silica gel material is soft in texture and good in elasticity, and cannot greatly influence the test and measurement of the device.
The embodiment also provides a pressure measurement system for patellar replacement, which comprises a wireless data receiving module, a data processing module and a display module besides the pressure measurement device for patellar replacement; the wireless data receiving module is in communication connection with a wireless communication module of the pressure measuring device and used for receiving data generated by the pressure measuring device. The wireless data receiving module, the data processing module and the display module are integrated in an intelligent terminal, and the intelligent terminal is a tablet computer in the embodiment.
The present embodiments also provide a method of using the pressure measurement system described above, i.e., a method of measuring patellar articular contact surface pressure during patellar replacement surgery. Existing patella replacement procedures first resect a portion of the patella valgus and then replace the patellar prosthesis 6. The utility model discloses measure the method of patellar articular contact surface pressure is after the excision part patella turns up, before the patellar prosthesis 6 of reloading, tests patellar articular contact surface pressure to supplementary doctor selects suitable patellar prosthesis 6 to install, including following step:
step one, as shown in fig. 7, a pressure measuring device is installed on a patellar section 41 left after a patient resects partial patella valgus;
step two, as shown in fig. 8, adjusting the angle α between the femur 4 and the tibia 5 of the patient, observing pressure changes at different angles α (at least including angles of 30 °, 60 °, 90 °, 120 ° and the like) by a doctor, and recording pressure data by an intelligent terminal;
and step three, as shown in fig. 9, taking out the pressure measuring device, analyzing the measured pressure data through the intelligent terminal, and assisting the doctor to select a proper patellar prosthesis 6 for installation.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A pressure measuring device for patellar replacement is characterized by comprising a shell, a circuit board and a strain sensing mechanism; wherein the content of the first and second substances,
the shell is used for accommodating the circuit board and the strain sensing mechanism, and the shape of the shell is approximately the same as that of the patellar prosthesis; the shell comprises a first shell and a second shell, the outer surface of the first shell is provided with an arc-shaped stress surface, and the inner surface of the first shell is provided with a stress column;
the circuit board comprises a power supply, a microprocessor, an analog-to-digital converter and a wireless communication module;
the strain sensing mechanism comprises a strain sensor and a sensor fixing seat, the strain sensor is fixed on the sensor fixing seat and electrically connected with the circuit board, and a groove matched with the stress column is formed in the sensor fixing seat, so that the force applied to the arc-shaped stress surface is transmitted to the sensor fixing seat through the stress column, and the strain sensor is deformed and responds.
2. The pressure measurement device for patellar replacement according to claim 1, wherein the force-bearing posts are four and are substantially evenly distributed along a circumference of the inner surface of the first housing, i.e., the four force-bearing posts are substantially square.
3. The pressure measurement device for patellar replacement according to claim 2, wherein the force-bearing post has a curved surface at an end thereof contacting the sensor mount, the curved surface being or including a portion of a hemisphere.
4. A pressure measurement device for patellar replacement according to claim 3, wherein the sensor mount is generally cross-shaped having four cantilevered beams, each of the beams having a recess at an end remote from the center of the sensor mount that matches the shape of the end of the force-bearing post that contacts the sensor mount.
5. The pressure measurement device for patellar replacement according to claim 4, wherein the groove has a notch at an end away from the center of the sensor mount.
6. The pressure measurement device for patellar replacement according to claim 4, wherein the strain sensor is a resistive strain gauge.
7. The pressure measurement device for patellar replacement according to claim 6, wherein the number of resistive strain gauges is four, each fixed to the four cantilever beams.
8. The pressure measurement device for patellar replacement according to claim 7, wherein the pressure measurement range of each of the resistive strain gauges is 0-200N.
9. The pressure measurement device for patellar replacement according to claim 1, wherein the circuit board is located between the first housing and the sensor mount, the second housing having a support post on an inner surface thereof for supporting the circuit board above the sensor mount to prevent it from contacting the sensor mount.
10. A pressure measurement system for patellar replacement, characterized by comprising a wireless data receiving module, a data processing module and a display module in addition to the pressure measurement device for patellar replacement according to any of claims 1 to 8; the wireless data receiving module is in communication connection with the wireless communication module of the pressure measuring device and is used for receiving data generated by the pressure measuring device; the wireless data receiving module, the data processing module and the display module are integrated in an intelligent terminal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117297611A (en) * | 2023-09-27 | 2023-12-29 | 上海逸动医学科技有限公司 | Auxiliary device for knee joint pressure measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117297611A (en) * | 2023-09-27 | 2023-12-29 | 上海逸动医学科技有限公司 | Auxiliary device for knee joint pressure measurement |
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