A pressure balance measurement system for knee replacement surgery

Abstract

This invention provides a pressure balance measurement system for knee replacement surgery, including a pressure signal processing device and a force measuring handle connected via a communication cable. The force measuring handle includes a pressure sensor, a housing, and a support structure. The support structure is connected to the housing via a telescopic tube, which has a bifurcated structure. The main rod of the bifurcated structure is connected to the support structure, and the two branches of the bifurcated structure are each connected to a housing. The distance and angle between the two housings and the support structure are adjustable via the telescopic tube. This invention meets the minimum thickness required for clinical use, has a high pressure measurement range and accuracy, high assessment reliability, an efficient and simple structure, provides bilateral pressure measurement, and the measurement points are adjustable, increasing its versatility in clinical application.

Description

Technical Field

[0001] This utility model relates to the field of joint pressure measurement devices, specifically a pressure balance measurement system for knee replacement surgery. Background Technology

[0002] The quality of treatment for knee joint diseases directly affects the patient's physical and psychological recovery. Knee replacement surgery is one of the more successful surgical methods for treating osteoarthritis, traumatic arthritis, and rheumatoid arthritis. However, accurate osteotomy is crucial for surgical correction, laying the foundation for subsequent prosthesis placement, medial and lateral ligament balancing, and lower limb alignment reconstruction. Currently, two osteotomy methods are commonly used in total knee replacement surgery. One is the measurement osteotomy method proposed by Berger et al., which involves independent equal-volume osteotomies of the femur and tibia using appropriate osteotomy tools. While this can achieve good lower limb alignment, it can easily lead to flexion gap laxity. The other is the gap-balancing osteotomy technique proposed by Dennis, which uses the proximal tibial osteotomy plane as a landmark to perform osteotomies on the distal femur. While this achieves perfect flexion-extension gap balance and has advantages such as smaller osteotomy volume, it can easily lead to patellar instability. The clinical merits of these two osteotomy methods are quite controversial.

[0003] Chinese utility model patent (CN 216090484 U) discloses a gap plate with knee joint pressure detection function, including a pressure detection module and a signal conversion module connected to each other. The pressure detection module detects the pressure on the knee joint during flexion and extension and sends the detected signal to the signal conversion module. The signal conversion module converts the received signal into a digital pressure display signal for display. After tibial osteotomy and distal femoral osteotomy are completed, the device is placed in the gap to visually observe whether the extension gap is uniform and to perform soft tissue release in the original position until balance is achieved.

[0004] However, existing technologies have the following drawbacks:

[0005] 1. In practical applications, the gap is not adjustable. If the overall thickness is not suitable for the knee joint after osteotomy, other thickness pads need to be tested, which increases the number of steps and makes the operation more complicated. Moreover, the compatibility still needs to be considered.

[0006] 2. The pressure measurement range and overall structure of the pressure diaphragm test have low accuracy, resulting in mediocre clinical efficacy.

[0007] 3. The overall structure is complex, with numerous parts and components, making it difficult to ensure stability under the sterilization requirements of surgical instruments.

[0008] 4. Only one side of the joint can be tested at a time, and multiple measurements are required to assess the pressure on the internal and external pressure sides, which increases the operation time of the surgery. Utility Model Content

[0009] To address the problems of existing technologies, this invention provides a pressure balance measurement system for knee replacement surgery. It meets the minimum thickness requirements for clinical use, offers a high pressure measurement range and accuracy, high assessment reliability, has a simple and efficient structure, provides bilateral pressure measurement, and allows for adjustable measurement points, thus increasing its versatility in clinical applications.

[0010] This invention provides a pressure balance measurement system for knee replacement surgery, including a pressure signal processing device and a force measuring handle connected via a communication cable. The force measuring handle includes a pressure sensor, a housing, and a support structure. The housing is connected to the support structure, the pressure sensor is placed inside the housing, and the housing is placed at the measurement point. The pressure on the housing is transmitted to the pressure sensor, and the pressure sensor transmits the signal to the pressure signal processing device via the pressure communication cable. The support structure is connected to the housing via a telescopic tube, and the distance and angle between the housing and the support structure are adjusted via the telescopic tube.

[0011] In a further improvement, the housing includes a lower cover and an upper cover, with the bottom of the pressure sensor fitted to the lower cover and the top of the pressure sensor fitted to the bottom surface of the upper cover.

[0012] In a further improvement, the lower cover and the upper cover are guided by a guide structure, which can be one of the following shapes: cylindrical, plum blossom-shaped, square, or semi-circular, preferably cylindrical. The number of guide structures is 1-8, preferably 4.

[0013] Further improvements include making the lower and upper covers circular, elliptical, waist-shaped, or rectangular, with the upper cover etched with area lines to indicate the area under stress. These area lines consist of several concentric circles with a diameter ranging from 5 to 25 mm.

[0014] In a further improvement, a gap block is connected to the bottom of the lower cover, and a sliding groove is designed at the bottom of the lower cover. The gap block is fixed to the lower cover through the sliding groove. The thickness of the gap block is 1 to 22 mm, and different thicknesses of gap blocks can be selected according to measurement requirements.

[0015] As a further improvement, the gap block is engraved with thickness markings.

[0016] Further improvements include the telescopic tube being a snake-bone tube or a threaded tube. The telescopic tube can have a bifurcated structure, with the main branch connecting to the supporting structure and each of the two branches connecting to a housing. Alternatively, the telescopic tube can be a single-section structure, with one end connected to the supporting structure and the other end connected to the housing.

[0017] In a further improvement, the support structure includes a grip handle and a main support tube connected in sequence, with the main rod of the telescopic tube connected to the main support tube.

[0018] In a further improvement, one end of the communication cable is connected to the pressure signal processing device via a cable plug, and the other end passes through the support structure and the telescopic tube to connect to the pressure sensor in the housing.

[0019] In a further improvement, the pressure signal processing device includes a switch button, a display screen, operation buttons, and a device housing.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. Provides bilateral pressure measurement with adjustable measurement points, increasing its versatility in clinical practice and providing doctors with a convenient surgical assessment system tool;

[0022] 2. High pressure measurement range and accuracy ensure reliable evaluation;

[0023] 3. The structure is efficient and simple, making it easy to manufacture, use, and maintain;

[0024] 4. The structure can meet the minimum thickness required for clinical use, and the thickness is physically adjustable to ensure wide applicability (5-20mm). Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.

[0027] Figure 2 This is a schematic diagram of a pressure signal processing device.

[0028] Figure 3 This is a schematic diagram of the force measuring handle.

[0029] Figure 4 This is a schematic diagram indicating the upper cover area.

[0030] Figure 5 A schematic diagram illustrating the adjustment of the bifurcated telescopic tube.

[0031] Figure 6 This is a schematic diagram of the gap block.

[0032] Figure 7 A schematic diagram showing the installation of gap blocks of different thicknesses on the lower cover.

[0033] Figure 8 This is a schematic diagram of a single-measurement structure telescopic tube in Example 2.

[0034] Figure 9 This is a schematic diagram of the portable structure in Example 3. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0036] Example 1

[0037] One specific embodiment of this utility model is as follows: Figure 1 As shown, it includes a pressure signal processing device 1, a communication cable 2, and a force measuring handle 3.

[0038] The pressure signal processing device 1 is as follows Figure 2 As shown, it includes a switch button 101, a display screen 102, an operation button 103, and a device housing 104.

[0039] The force measuring handle 3 is as follows Figure 3 As shown, it includes: a fastening screw 301, a lower cover 302, a pressure sensor 303, an upper cover 304, a telescopic tube 305, a gap block 306, a main support tube 307, a grip handle 308, a cable plug 309, and a cable sheath 310.

[0040] In some instances, the top cover 304 can be circular, elliptical, oblong, or rectangular; the top cover can be etched with area lines to indicate areas under stress, the area lines being several concentric circles with a diameter ranging from 5-25 mm. One specific embodiment is as follows: Figure 4 As shown, it includes an inner circle 3041 and an outer circle 3042, and the area lines are circles with diameters of 10mm and 20mm.

[0041] In some instances, the lower cover 302 and the upper cover 304 are guided by a cylindrical structure. The surface should be as smooth as possible to reduce friction and improve the accuracy of pressure measurement. The guide structure can be quincunx-shaped, square, or semi-circular, but cylindrical is preferred. The number is preferably four, but can be 1, 2, 3, 4, 5, 6, 7, or 8.

[0042] The bottom of the pressure sensor 303 is fitted to the lower cover 302, and the top of the pressure sensor 303 is fitted to the bottom surface of the upper cover 304. The lower cover 302 and the upper cover 304 are connected by screws 301 to form a housing. When the housing is subjected to downward pressure, the pressure sensor 303 can directly receive the pressure signal and transmit it to the pressure signal processing device 1 via the communication cable 2. The device processes the signal, calculates the pressure value, and displays it on the display screen 102. The pressure sensor 303 preferably uses a miniature button type, resulting in a small overall size and isolation of the internal electrical components from the external environment, making it waterproof and dustproof. This ensures the long-term stability of the electronic components.

[0043] One end of the communication cable 2 is connected to the pressure signal processing device 1 via a cable plug 309, and the other end passes through the grip handle 308, the main support tube 307, and the telescopic tube 305, and is connected to the pressure sensor 303 in the housing. A cable sheath 310 is provided between the communication cable 2 and the grip handle 308.

[0044] Because the condition of the knee joint after osteotomy varies, and the measurement sites have different requirements, a double-forked design is incorporated at the branch point at the distal end of the main support tube to accommodate these needs. This double-forked design includes a 305 telescopic tube, which can be either a snake-bone tube or a threaded tube, allowing for adjustment of length and angle. Figure 5 As shown. This ultimately allows the measuring planes of the two pressure sensors to be adjusted to a suitable measuring plane.

[0045] Example 2

[0046] The telescopic tube uses a single-section structure and can be fixed at the required length and angle, such as... Figure 8 As shown, the remaining parts of the structure are the same as in Embodiment 1, and are a simplified version of the structure in Embodiment 1.

[0047] Example 3

[0048] The pressure signal processing device 1 and the communication cable 2 are integrated into the grip handle 308 of the force measuring handle 3. The grip handle 308 has a handle display 110 connected to the pressure signal processing device 1 and a handle operation button 111. This embodiment is more difficult to manufacture than the first embodiment, but it is easy to carry.

[0049] Because the amount of osteotomy performed on the knee joint varies, the measurement gap needs to be adjusted accordingly. A sliding groove 3021 is designed at the bottom of the lower cover 302; correspondingly, the gap block 306 is secured to the sliding groove with a clip 3061. Figure 6 As shown. If the gap thickness needs to be adjusted, simply replace it with a gap block of the required thickness. The designed gap block thickness is 1-22mm. The final thickness adjustment is as follows: Figure 7As shown, the gap block includes a thin gap block 3062 and a thick gap block 3063. The gap block 306 has engravings indicating its thickness, 3064, to facilitate identification and replacement by operators.

[0050] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A pressure balance measurement system for knee replacement surgery, comprising a pressure signal processing device (1) and a force measuring handle (3) connected via a communication cable (2); the force measuring handle (3) comprises a pressure sensor (303), a housing, and a support structure, the housing being connected to the support structure, the pressure sensor (303) being placed inside the housing, the housing being placed at the measurement point, the pressure on the housing being transmitted to the pressure sensor (303), and the pressure sensor (303) transmitting the signal to the pressure signal processing device (1) via the pressure communication cable (2); characterized in that: The support structure is connected to the shell via a telescopic tube (305), and the distance and angle between the shell and the support structure are adjusted via the telescopic tube.

2. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: The housing includes a lower cover (302) and an upper cover (304). The bottom of the pressure sensor (303) is fitted to the lower cover (302), and the top of the pressure sensor (303) is fitted to the bottom surface of the upper cover (304). The lower cover (302) and the upper cover (304) are guided by a guide structure, which is one of cylindrical, plum blossom, square, or semi-circular shapes, and the number of guide structures is 1-8.

3. The knee replacement surgery pressure balance measurement system according to claim 2, characterized in that: The lower cover (302) and the upper cover (304) are circular, elliptical, waist-shaped or rectangular. The upper cover (304) is etched with area lines for indicating the area under force. The area lines are several concentric circles with a diameter ranging from 5 to 25 mm.

4. The knee replacement surgery pressure balance measurement system according to claim 2, characterized in that: A gap block (306) is connected below the lower cover (302). A sliding groove is designed at the bottom of the lower cover (302). The gap block (306) is fixed to the lower cover (302) through the sliding groove. The thickness of the gap block is 1 to 22 mm. Different thicknesses of gap blocks (306) can be selected according to measurement requirements.

5. The knee replacement surgery pressure balance measurement system according to claim 4, characterized in that: The gap block (306) is engraved with a thickness mark (3064).

6. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: The telescopic tube is a snake-bone tube or a threaded tube, and the telescopic tube has a bifurcated structure. The main rod of the bifurcated structure is connected to the supporting structure, and the two branches of the bifurcated structure are respectively connected to a shell.

7. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: The telescopic tube is a snake-bone tube or a threaded tube, with one end connected to the supporting structure and the other end connected to the shell.

8. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: The support structure includes a grip handle (308) and a main support tube (307) connected in sequence, and the main rod of the telescopic tube (305) is connected to the main support tube (307).

9. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: One end of the communication cable (2) is connected to the pressure signal processing device (1) via a cable plug (309), and the other end passes through the support structure and telescopic tube to connect to the pressure sensor (303) in the housing.

10. The knee replacement surgery pressure balance measurement system according to claim 1, characterized in that: The pressure signal processing device (1) includes a switch button (101), a display screen (102), an operation button (103), and a device housing (104).

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