Femoral tibia gap measuring device and system and knee joint operation system

Abstract

The invention relates to a thighbone and tibia gap measuring device and system and a knee joint operation system. The thighbone and tibia gap measuring device comprises an air bag unit, an upper platform unit, a lower platform unit, a limiting unit and a pressure monitoring unit. The femur and tibia gap measuring device has the advantages that the femur and tibia gap measuring device is of an ultra-thin structure and can be conveniently placed in a joint gap of a femur and a tibia before an operation, so that gap measurement before osteotomy is met; through pressure monitoring, the joint gap value can be obtained in real time, so that the osteotomy efficiency is improved, the osteotomy amount is reduced, and excessive osteotomy is avoided; the method is high in universality and can be suitable for different measurement scenes; cost is low, and large-scale popularization and use are facilitated.

Description

Technical Field

[0001] This invention relates to the field of knee replacement surgery instruments, and more particularly to a femoral-tibial space measuring device, system, and knee surgery system. Background Technology

[0002] In knee replacement surgery, the balance of soft tissue in extension and flexion is an important indicator of surgical quality. In traditional procedures, after the prosthesis is placed, the surgeon usually relies on touch to judge the soft tissue condition. If there is an imbalance of pressure between the medial and lateral condyles, the ligaments are loosened to restore balance on both sides. This operation is highly dependent on the surgeon's experience and cannot be standardized or quantified.

[0003] Nowadays, with the rapid development of medicine and medical devices, orthopedic surgical robots, with their short learning cycle and precise artificial bone, are gradually replacing manual surgical procedures. Utilizing their built-in navigation system, they can also accurately measure the femoral-tibial gap value in various states, providing a quantitative and accurate reference for the adjustment of soft tissue balance.

[0004] However, existing instruments for measuring the femoral-tibial interosseous space have the following drawbacks:

[0005] 1) Poor versatility: Most measuring instruments on the market are dedicated to a single purpose, meaning that the applicable scope of a measuring instrument can only cover a single brand and model of prosthesis, which severely limits the application scenarios;

[0006] 2) Poor applicability: Due to high usage costs, its popularity is low;

[0007] 3) Limited application scenarios: Currently, universal knee joint soft tissue measuring instruments only support rough measurements in extension and flexion positions after osteotomy during surgery. Moreover, the osteotomy features have already been completed during the measurement, and the only way to adjust the gap balance is to release the ligaments, which increases trauma to some extent.

[0008] Currently, no effective solutions have been proposed for the problems of poor universality and inability to perform measurements before osteotomy in related technologies. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a femoral-tibial space measuring device, system, and knee joint surgery system, thereby solving problems such as poor versatility and inability to perform measurements before osteotomy.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] In a first aspect, a femoral-tibial space measuring device is provided for use before osteotomy in knee replacement surgery, comprising:

[0012] The airbag unit is used to communicate with a fluid source and to perform fluid injection or fluid discharge operations under the action of the fluid source.

[0013] An upper platform unit is disposed on the upper part of the airbag unit and is used to reciprocate in the vertical direction under the action of the airbag unit.

[0014] A lower platform unit is disposed at the lower part of the airbag unit and is removably disposed in the joint space between the femur and tibia.

[0015] A limiting unit is provided between the upper platform unit and the lower platform unit. The limiting unit contains the airbag unit, which is used to restrict the airbag unit to expand or contract only in the vertical direction.

[0016] A pressure monitoring unit is provided at least in the upper platform unit for monitoring the pressure exerted on the upper platform unit;

[0017] The initial thickness of the femoral-tibial space measuring device is ≤4mm.

[0018] In some embodiments, the airbag unit includes:

[0019] An airbag element is disposed inside the limiting unit and located between the upper platform unit and the lower platform unit. It is used to perform fluid injection or fluid discharge operations under the action of a fluid source to drive the upper platform unit to reciprocate in the vertical direction.

[0020] A conveying element, the first end of which is connected to the airbag element for supplying fluid source flow;

[0021] An interface element is disposed at the second end of the conveying element for connecting to a fluid source device so that the fluid source device supplies fluid to the airbag element through the conveying element and extracts fluid from the airbag element through the conveying element.

[0022] In some embodiments, the upper platform unit includes:

[0023] An upper platform element is disposed above the airbag unit and above the limiting unit, and is equipped with the pressure monitoring unit for reciprocating motion in the vertical direction under the action of the airbag unit.

[0024] In some embodiments, the upper platform unit further includes:

[0025] A first guide element is disposed at the bottom end of the upper platform element and is movably connected to the limiting unit to assist the upper platform element in reciprocating motion in the vertical direction.

[0026] A first positioning element is disposed at the bottom end of the first guide element and is movably connected to the limiting unit to prevent the first guide element from separating from the limiting unit.

[0027] In some embodiments, the lower platform unit includes:

[0028] The lower platform element is disposed at the lower part of the airbag unit and the lower part of the limiting unit, and is used to reciprocate in the vertical direction under the action of the airbag unit.

[0029] In some embodiments, the lower platform unit further includes:

[0030] The second guide element is disposed at the top of the lower platform unit and is movably connected to the limiting unit to assist the lower platform element in reciprocating motion in the vertical direction.

[0031] The second positioning element is disposed at the top of the second guide element and is movably connected to the limiting unit to prevent the second guide element from separating from the limiting unit.

[0032] In some embodiments, the limiting unit includes:

[0033] A limiting element is provided between the upper platform unit and the lower platform unit. The airbag unit is provided inside the limiting element to restrict the airbag unit to inflate or contract only in the vertical direction.

[0034] In some embodiments, the limiting unit further includes:

[0035] A third guide element is disposed on the limiting element and is movably connected to the upper platform unit to assist the upper platform unit in reciprocating motion in the vertical direction;

[0036] The third positioning element is disposed at the end of the third guide element and is movably connected to the upper platform unit to prevent the upper platform unit from separating from the third guide element.

[0037] In some embodiments, the limiting unit further includes:

[0038] A fourth guide element is disposed on the limiting element and is movably connected to the lower platform unit to assist the lower platform unit in reciprocating motion in the vertical direction.

[0039] A fourth positioning element is disposed at the end of the fourth guide element and is movably connected to the lower platform unit to prevent the lower platform unit from separating from the fourth guide element.

[0040] Secondly, a femoral-tibial interosseous space measurement system is provided for use before osteotomy in knee replacement surgery, including:

[0041] The femoral-tibial space measuring device as described in the first aspect;

[0042] A fluid source device is connected to the airbag unit of the femoral-tibial space measuring device for supplying fluid to the airbag unit to inflate the airbag unit and extracting fluid from the airbag unit to contract the airbag unit.

[0043] In some embodiments, there are multiple femoral-tibial space measuring devices, which are distributed in the joint space of the femur and tibia.

[0044] In some embodiments, the fluid source device is a single device, which is connected to several of the femoral-tibial space measuring devices and independently controls the several femoral-tibial space measuring devices.

[0045] In some embodiments, there are multiple fluid source devices, each of which is connected to a corresponding femoral-tibial space measuring device for independently controlling the corresponding femoral-tibial space measuring device.

[0046] In some of these embodiments, it also includes:

[0047] A flexible connection device, wherein the first end of the flexible connection device is detachably connected to the airbag unit of the femoral neck interosseous space measuring device, and the second end of the flexible connection device is detachably connected to the fluid source device for supplying fluid flow.

[0048] In some embodiments, there are several flexible connection devices, with the first end of each flexible connection device being detachably connected to the airbag unit of the corresponding femoral neck interosseous space measuring device, and the second end of each flexible connection device being detachably connected to the corresponding fluid source device.

[0049] Thirdly, a knee joint surgical system is provided, comprising:

[0050] As described in the first aspect, the femoral-tibial space measuring device;

[0051] A femoral tracer is used to be fixed to the femur to track the spatial position of the femur in real time.

[0052] Tibial tracer, used to be fixed to the tibia to track the spatial position of the tibia in real time.

[0053] Fourthly, a knee joint surgery system is provided, comprising:

[0054] The femoral-tibial space measurement system as described in the second aspect;

[0055] A femoral tracer is used to be fixed to the femur to track the spatial position of the femur in real time.

[0056] Tibial tracer, used to be fixed to the tibia to track the spatial position of the tibia in real time.

[0057] The present invention adopts the above technical solution, which has the following technical effects compared with the prior art:

[0058] This invention discloses a femoral-tibial space measuring device, system, and knee joint surgery system. The femoral-tibial space measuring device adopts an ultra-thin structure, which is convenient for placement in the joint space of the femoral and tibia before surgery, thereby meeting the requirements for space measurement before osteotomy. Through pressure monitoring, the joint space value can be obtained in real time, thereby improving osteotomy efficiency, reducing osteotomy amount, and avoiding excessive osteotomy. It has high versatility and can be applied to different measurement scenarios. It is low in cost and easy to widely use. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the initial state of the femoral-tibial space measuring device according to an embodiment of the present invention;

[0060] Figure 2 This is a schematic diagram of the expansion state of the femoral-tibial space measuring device according to an embodiment of the present invention;

[0061] Figure 3 This is a schematic diagram of an airbag unit according to an embodiment of the present invention;

[0062] Figure 4 This is a schematic diagram (a) of the upper platform unit according to an embodiment of the present invention;

[0063] Figure 5 This is a schematic diagram (a) of the lower platform unit according to an embodiment of the present invention;

[0064] Figure 6 This is a schematic diagram (a) of a limiting unit according to an embodiment of the present invention;

[0065] Figure 7This is a schematic diagram (II) of the upper platform unit according to an embodiment of the present invention;

[0066] Figure 8 This is a schematic diagram (II) of the lower platform unit according to an embodiment of the present invention;

[0067] Figure 9 This is a schematic diagram (II) of the limiting unit according to an embodiment of the present invention;

[0068] Figure 10 This is a schematic diagram of a femoral-tibial space measurement system according to an embodiment of the present invention;

[0069] Figure 11 This is a schematic diagram of a knee joint surgery system according to an embodiment of the present invention;

[0070] Figure 12 This is a schematic diagram of a specific embodiment of the knee joint surgery system according to an embodiment of the present invention.

[0071] The attached figures are labeled as follows: 100, Femoral-tibial space measuring device;

[0072] 110. Airbag unit; 111. Airbag component; 112. Delivery component; 113. Interface component;

[0073] 120. Upper platform unit; 121. Upper platform element; 122. First guide element; 123. First positioning element;

[0074] 130. Lower platform unit; 131. Lower platform component; 132. Second guide component; 133. Second positioning component;

[0075] 140. Limiting unit; 141. Limiting element; 142. Third guide element; 143. Third positioning element; 144. Fourth guide element; 145. Fourth positioning element;

[0076] 150. Pressure monitoring unit;

[0077] 200. Fluid source device;

[0078] 300. Flexible connection device;

[0079] 400. Femoral tracer device;

[0080] 500. Tibial tracer device. Detailed Implementation

[0081] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0082] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0083] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0084] Example 1

[0085] This embodiment relates to the femoral-tibial space measuring device of the present invention.

[0086] An illustrative embodiment of the present invention, such as Figures 1-2 As shown, a femoral-tibial joint space measuring device 100 is used before osteotomy in knee replacement surgery. It includes an airbag unit 110, an upper platform unit 120, a lower platform unit 130, a limiting unit 140, and a pressure monitoring unit 150. The airbag unit 110 is connected to a fluid source and is used to inject or discharge fluid under the action of the fluid source. The upper platform unit 120 is located above the airbag unit 110 and is used for reciprocating vertically under the action of the airbag unit 110. The lower platform unit 130 is located below the airbag unit 110 and is removably positioned in the femoral-tibial joint space. The limiting unit 140 is located between the upper platform unit 120 and the lower platform unit 130, and the airbag unit 110 is disposed inside the limiting unit 140 to restrict the airbag unit 110 to inflate or contract only in the vertical direction. The pressure monitoring unit 150 is located at least in the upper platform unit 120 and is used to monitor the pressure on the upper platform unit 120.

[0087] The initial thickness of the femoral-tibial space measuring device 100 is ≤4mm.

[0088] Preferably, the initial thickness of the femoral-tibial space measuring device 100 is 2-3 mm.

[0089] The working principle of this invention is as follows:

[0090] Before osteotomy, the patient's original soft tissue condition is measured by the femoral-tibial space measuring device 100 during extension and flexion. This provides a reference for adjusting the osteotomy space during surgery. By adjusting the intraoperative plan and changing the amount of internal and external osteotomy, the postoperative soft tissue balance can be achieved, while preserving more of the patient's soft tissue.

[0091] In this invention, the upper platform unit 120 is made of rigid materials, including but not limited to polyethylene materials.

[0092] In this invention, the upper platform unit 120 and the airbag unit 110 can be fixedly connected, such as by adhesive; or they can be unconnected, with the airbag unit 110 abutting against the upper platform unit 120 only when the airbag unit 110 is inflated.

[0093] In this invention, the lower platform unit 130 is made of rigid materials, including but not limited to polyethylene.

[0094] In this invention, the lower platform unit 130 and the airbag unit 110 can be fixedly connected, such as by bonding; or they can be unconnected, with the airbag unit 110 abutting against the lower platform unit 130 only when the airbag unit 110 is inflated.

[0095] In this invention, the limiting unit 140 is made of a hard material, including but not limited to alloy materials, such as stainless steel.

[0096] In this invention, the limiting unit 140 and the airbag unit 110 can be fixedly connected, such as by bonding or embedding; or they can be unconnected, with the airbag unit 110 abutting against the limiting unit 140 only when the airbag unit 110 is inflated.

[0097] The pressure monitoring unit 150 can be located on the upper surface of the upper platform unit 120 or on the lower surface of the upper platform unit 120.

[0098] In some embodiments, the pressure monitoring unit 150 is also disposed inside the airbag unit 110.

[0099] In some embodiments, the pressure monitoring unit 150 is also disposed on the lower platform unit 130. The pressure monitoring unit 150 may be disposed on the upper surface of the lower platform unit 130 or on the lower surface of the lower platform unit 130.

[0100] In one preferred embodiment, the pressure monitoring unit 150 is disposed on the upper surface of the upper platform unit 120 and the lower surface of the lower platform unit 130.

[0101] The pressure monitoring unit 150 can wirelessly connect to external control devices, including but not limited to Wi-Fi and Bluetooth connections.

[0102] In some embodiments, the pressure monitoring unit 150 includes, but is not limited to, a thin-film pressure monitoring sensor and an array pressure monitoring sensor. Furthermore, the pressure monitoring unit 150 is a sensor with its own power supply.

[0103] In a preferred embodiment of the present invention, the airbag unit 110, the upper platform unit 120, the lower platform unit 130, and the limiting unit 140 are integrated. The upper platform unit 120 becomes the upper surface of the airbag unit 110, the lower platform unit 130 becomes the lower surface of the airbag unit 110, and the limiting unit 140 is embedded in the side surface of the airbag unit 110.

[0104] In this preferred embodiment, the femoral-tibial space measuring device 100 is used as follows:

[0105] The femoral-tibial space measuring device 100 is placed in the joint space between the femur and tibia;

[0106] Fluid is injected into the airbag unit 110;

[0107] Under the action of the limiting unit 140, the airbag unit 110 can only expand in the vertical direction, thereby driving the upper platform unit 120 to move upward until it touches the femur and the lower platform unit 130 to move downward until it touches the tibia. Generally, the moving distance of the upper platform unit 120 is greater than the moving distance of the lower platform unit 130.

[0108] At this time, the joint space value of the femur and tibia can be calculated by the volume of fluid injected into the airbag unit 110 or the pressure value monitored by the pressure monitoring unit 150 (such as the pressure of the airbag unit 110, the pressure of the upper platform unit 120, and the pressure of the lower platform unit 130).

[0109] like Figure 3 As shown, the airbag unit 110 includes an airbag element 111, a delivery element 112, and an interface element 113. The airbag element 111 is disposed inside the limiting unit 140 and located between the upper platform unit 120 and the lower platform unit 130. It is used to inject or discharge fluid under the action of a fluid source, thereby driving the upper platform unit 120 to reciprocate vertically. The first end of the delivery element 112 is connected to the airbag element 111 for supplying fluid. The interface element 113 is disposed at the second end of the delivery element 112 and is connected to the fluid source device 200 so that the fluid source device 200 supplies fluid to the airbag element 111 through the delivery element 112 and extracts fluid from the airbag element 111 through the delivery element 112.

[0110] The shape of the airbag element 111 can be a regular shape (such as a circle, ellipse, rectangle, etc.) or an irregular shape (such as a combination of a quarter circle and a rectangle).

[0111] The airbag element 111 is made of a flexible and stretchable material, such as a rubber membrane wrapped with a fiber web.

[0112] In some of these embodiments, the airbag element 111 includes, but is not limited to, an airbag.

[0113] The delivery element 112 is fixedly connected to the airbag element 111, including but not limited to being integrally molded.

[0114] In some embodiments, the delivery element 112 includes, but is not limited to, a delivery tube, such as a silicone hose.

[0115] The interface element 113 is fixedly connected to the conveying element 112, including but not limited to being integrally formed.

[0116] In some of these embodiments, the interface element 113 includes, but is not limited to, a threaded interface and a snap-fit ​​interface.

[0117] like Figure 4 As shown, the upper platform unit 120 includes an upper platform element 121. The upper platform element 121 is disposed above the airbag unit 110 and above the limiting unit 140, and is provided with a pressure monitoring unit 150 for reciprocating motion in the vertical direction under the action of the airbag unit 110.

[0118] Specifically, the upper platform element 121 is disposed on the upper part of the airbag element 111.

[0119] The upper platform element 121 and the airbag element 111 can be fixedly connected, such as by adhesive; or they can be unconnected, with the airbag element 111 only abutting against the upper platform element 121 when the airbag element 111 is inflated.

[0120] The shape of the upper platform element 121 can be a regular shape (such as a circle, ellipse, rectangle, etc.) or an irregular shape (such as a combination of a quarter circle and a rectangle).

[0121] In some of these embodiments, the upper platform element 121 includes, but is not limited to, a rigid PVC sheet.

[0122] like Figure 5 As shown, the lower platform unit 130 includes a lower platform element 131. The lower platform element 131 is disposed at the lower part of the airbag unit 110 and the lower part of the limiting unit 140, and is used to reciprocate in the vertical direction under the action of the airbag unit 110.

[0123] Specifically, the lower platform element 131 is disposed at the lower part of the airbag element 111.

[0124] The lower platform element 131 and the airbag element 111 can be fixedly connected, such as by bonding; or they can be unconnected, with the airbag element 111 only abutting against the lower platform element 131 when the airbag element 111 is inflated.

[0125] The shape of the lower platform element 131 can be a regular shape (such as a circle, ellipse, rectangle, etc.) or an irregular shape (such as a combination of a quarter circle and a rectangle, etc.).

[0126] In some of these embodiments, the lower platform element 131 includes, but is not limited to, a rigid PVC sheet.

[0127] like Figure 6 As shown, the limiting unit 140 includes a limiting element 141. The limiting element 141 is disposed between the upper platform unit 120 and the lower platform unit 130. An airbag unit 110 is disposed inside the limiting element 141 to limit the airbag unit 110 to expand or contract only in the vertical direction.

[0128] Specifically, the limiting element 141 is disposed between the upper platform element 121 and the lower platform element 131, and the limiting element 141 is provided with an airbag element 111 inside, which is used to limit the airbag element 111 to expand or contract only in the vertical direction.

[0129] In this invention, the limiting element 141 is made of a hard material, including but not limited to alloy materials, such as stainless steel.

[0130] In this invention, the limiting element 141 and the airbag element 111 can be fixedly connected, such as by bonding or embedding; or they can be unconnected, with the airbag element 111 abutting against the limiting element 141 only when the airbag element 111 is inflated.

[0131] The shape of the limiting element 141 can be a regular shape (such as a circle, ellipse, rectangle, etc.) or an irregular shape (such as a combination of a quarter circle and a rectangle).

[0132] In some of these embodiments, the limiting element 141 includes, but is not limited to, a limiting ring, a limiting collar, etc.

[0133] Furthermore, the limiting unit 140 also includes a through element. The through element is disposed through the side of the limiting element 141 and is connected to the airbag unit 110.

[0134] Specifically, the through element is connected to the conveying element 112 for the conveying element 112 to pass through the limiting element 141.

[0135] In some of these embodiments, the through element includes, but is not limited to, a through hole.

[0136] The method of using this invention is as follows:

[0137] (I) Gap Measurement

[0138] Insert the femoral-tibial space measuring device 100 into the medial and lateral condylar joint space;

[0139] By injecting fluid (such as liquid or gas) into the airbag element 111, the airbag element 111 expands in the vertical direction under the action of the limiting element 141;

[0140] At this time, the upper platform element 121 moves upward under the action of the airbag element 111, and the lower platform element 131 moves downward under the action of the airbag element 111.

[0141] When the pressure after the inflation fluid in the airbag element 111 reaches the preset pressure value (or the pressure after the upper platform element 121 abuts against the femur reaches the preset pressure value, or the pressure after the lower platform element 131 abuts against the tibia reaches the preset pressure value), the real-time gap value can be obtained, which facilitates subsequent osteotomy operations.

[0142] (II) Evacuation

[0143] After the measurement (or surgery) is completed, the fluid in the airbag element 111 is drained, and then the femoral-tibial space measuring device 100 is withdrawn.

[0144] Dispose of the femoral-tibial space measuring device 100 in the medical waste collection location.

[0145] The technical effects of this invention are as follows:

[0146] 1) The femoral-tibial space measuring device adopts an ultra-thin structure, which makes it easy to place in the joint space of the femoral and tibia before surgery, thereby meeting the requirements for space measurement before osteotomy.

[0147] 2) Pressure monitoring can be used to obtain joint space values ​​in real time, thereby improving osteotomy efficiency, reducing the amount of osteotomy, and avoiding excessive osteotomy.

[0148] 3) High versatility, applicable to different measurement scenarios;

[0149] 4) Low cost, making it easy to use on a large scale.

[0150] Example 2

[0151] This embodiment is a modified embodiment of embodiment 1.

[0152] like Figure 7 As shown, the upper platform unit 120 also includes a first guide element 122 and a first positioning element 123. The first guide element 122 is disposed at the bottom end of the upper platform element 121 and is movably connected to the limiting unit 140, and is used to assist the upper platform element 121 in reciprocating motion in the vertical direction; the first positioning element 123 is disposed at the bottom end of the first guide element 122 and is movably connected to the limiting unit 140, and is used to prevent the first guide element 122 from separating from the limiting unit 140.

[0153] In this invention, the purpose of setting the first guide element 122 and the first positioning element 123 is to ensure that the upper platform element 121 only reciprocates in the vertical direction and avoids the upper platform element 121 from being displaced in the horizontal direction.

[0154] The first guide element 122 and the upper platform element 121 are fixedly connected, including but not limited to being integrally formed.

[0155] In some embodiments, there are multiple first guide elements 122. Multiple first guide elements 122 are distributed at the bottom end of the upper platform element 121.

[0156] In some of these embodiments, the first guide element 122 includes, but is not limited to, a guide ring and a guide post.

[0157] By using the annular first guide element 122, tissue fluid, tissue, etc. can be prevented from contacting the airbag element 111 when the upper platform element 121 moves upward.

[0158] The first positioning element 123 is fixedly connected to the first guiding element 122, including but not limited to being integrally formed.

[0159] The number of first positioning elements 123 matches the number of first guide elements 122. Generally, the number of first positioning elements 123 is not less than the number of first guide elements 122. That is, the number of first positioning elements 123 can be greater than the number of first guide elements 122, and the number of first positioning elements 123 can be equal to the number of first guide elements 122.

[0160] In some embodiments, there are multiple first positioning elements 123. The multiple first positioning elements 123 are respectively disposed at the bottom end of the corresponding first guide element 122.

[0161] The longitudinal section of the structure formed by the first positioning element 123 and the first guiding element 122 is L-shaped or T-shaped.

[0162] In some of these embodiments, the first positioning element 123 includes, but is not limited to, a positioning ring, a positioning plate, etc.

[0163] like Figure 8 As shown, the lower platform unit 130 also includes a second guide element 132 and a second positioning element 133. The second guide element 132 is disposed at the top of the lower platform unit 130 and is movably connected to the limiting unit 140 to assist the lower platform element 131 in reciprocating motion in the vertical direction; the second positioning element 133 is disposed at the top of the second guide element 132 and is movably connected to the limiting unit 140 to prevent the second guide element 132 from separating from the limiting unit 140.

[0164] In this invention, the purpose of providing the second guide element 132 and the second positioning element 133 is to ensure that the lower platform element 131 only reciprocates in the vertical direction, and to avoid the lower platform element 131 from having horizontal displacement.

[0165] The second guide element 132 and the lower platform element 131 are fixedly connected, including but not limited to being integrally formed.

[0166] In some embodiments, there are multiple second guide elements 132. Multiple second guide elements 132 are distributed at the top of the lower platform element 131.

[0167] In some of these embodiments, the second guide element 132 includes, but is not limited to, a guide ring and a guide post.

[0168] By using the annular second guide element 132, tissue fluid, tissue, etc. can be prevented from contacting the airbag element 111 when the lower platform element 131 moves downward.

[0169] The second positioning element 133 is fixedly connected to the second guiding element 132, including but not limited to being integrally formed.

[0170] The number of second positioning elements 133 matches the number of second guide elements 132. Generally, the number of second positioning elements 133 is equal to the number of second guide elements 132.

[0171] In some embodiments, there are multiple second positioning elements 133. The multiple second positioning elements 133 are respectively disposed at the top end of the corresponding second guide element 132.

[0172] The longitudinal section of the structure formed by the second positioning element 133 and the second guiding element 132 is L-shaped or T-shaped.

[0173] In some of these embodiments, the second positioning element 133 includes, but is not limited to, a positioning ring, a positioning plate, etc.

[0174] like Figure 9 As shown, the limiting unit 140 also includes a third guide element 142 and a third positioning element 143. The third guide element 142 is disposed on the limiting element 141 and is movably connected to the upper platform unit 120, assisting the upper platform unit 120 in reciprocating motion in the vertical direction. The third positioning element 143 is disposed at the end of the third guide element 142 and is movably connected to the upper platform unit 120, preventing the upper platform unit 120 from separating from the third guide element 142.

[0175] Specifically, the third guide element 142 is movably connected to the first guide element 122 and the first positioning element 123; the third positioning element 143 is movably connected to the first guide element 122 and abuts against the first positioning element 123 to prevent the first guide element 122 from separating from the third guide element 142.

[0176] The third guide element 142 is disposed through the upper end of the limiting element 141.

[0177] The dimensions of the third guide element 142 are matched with those of the first guide element 122. Generally, the height (depth) of the third guide element 142 is equal to the height of the first guide element 122, and the width of the third guide element 142 is greater than the width (thickness) of the first guide element 122.

[0178] The dimensions of the third guide element 142 are matched with the dimensions of the first positioning element 123. Generally, the height of the third guide element 142 is greater than the height of the first positioning element 123, and the width of the third guide element 142 is equal to the width of the first positioning element 123.

[0179] The number of third guide elements 142 matches the number of first guide elements 122. Generally, the number of third guide elements 142 is equal to the number of first guide elements 122.

[0180] In some embodiments, there are multiple third guide elements 142. Multiple third guide elements 142 are distributed on the upper part of the limiting element 141.

[0181] In some of these embodiments, the third guide element 142 includes, but is not limited to, a guide ring groove and a guide column groove.

[0182] The third positioning element 143 is disposed through the upper end of the limiting element 141 and is connected to the third guiding element 142.

[0183] The dimensions of the third positioning element 143 are matched with the dimensions of the first guide element 122. Generally, the width of the third positioning element 143 is equal to the width of the first guide element 122.

[0184] The dimensions of the third positioning element 143 are matched with the dimensions of the first positioning element 123. Generally, the width of the third positioning element 143 is smaller than the width of the first positioning element 123.

[0185] The number of third positioning elements 143 matches the number of third guide elements 142. Generally, the number of third positioning elements 143 is not greater than the number of third guide elements 142. That is, the number of third positioning elements 143 can be less than the number of third guide elements 142, and the number of third positioning elements 143 can be equal to the number of third guide elements 142.

[0186] In some embodiments, there are multiple third positioning elements 143. The multiple third positioning elements 143 are respectively disposed at the bottom end of the corresponding third guide element 142.

[0187] The longitudinal section of the structure formed by the third positioning element 143 and the third guiding element 142 is L-shaped or T-shaped.

[0188] In some of these embodiments, the third positioning element 143 includes, but is not limited to, a positioning ring groove, a positioning plate groove, etc.

[0189] Furthermore, such as Figure 9 As shown, the limiting unit 140 also includes a fourth guide element 144 and a fourth positioning element 145. The fourth guide element 144 is disposed on the limiting element 141 and is movably connected to the lower platform unit 130, assisting the lower platform unit 130 in reciprocating motion in the vertical direction. The fourth positioning element 145 is disposed at the end of the fourth guide element 144 and is movably connected to the lower platform unit 130, preventing the lower platform unit 130 from separating from the fourth guide element 144.

[0190] Specifically, the fourth guide element 144 is movably connected to the second guide element 132 and the second positioning element 133; the fourth positioning element 145 is movably connected to the second guide element 132 and abuts against the second positioning element 133 to prevent the second guide element 132 from separating from the fourth guide element 144.

[0191] The fourth guide element 144 is disposed through the lower end of the limiting element 141.

[0192] The fourth guide element 144 and the third guide element 142 may or may not be connected.

[0193] The dimensions of the fourth guide element 144 match those of the second guide element 132. Generally, the height (depth) of the fourth guide element 144 is equal to the height of the second guide element 132, and the width of the fourth guide element 144 is greater than the width (thickness) of the second guide element 132.

[0194] The dimensions of the fourth guide element 144 match those of the second positioning element 133. Generally, the height of the fourth guide element 144 is greater than the height of the second positioning element 133, and the width of the fourth guide element 144 is equal to the width of the second positioning element 133.

[0195] The number of fourth guide elements 144 matches the number of second guide elements 132. Generally, the number of fourth guide elements 144 is equal to the number of second guide elements 132.

[0196] In some embodiments, there are multiple fourth guide elements 144. Multiple fourth guide elements 144 are distributed on the upper part of the limiting element 141.

[0197] In some of these embodiments, the fourth guide element 144 includes, but is not limited to, a guide ring groove and a guide column groove.

[0198] The fourth positioning element 145 is disposed through the lower end of the limiting element 141 and is connected to the fourth guide element 144.

[0199] The dimensions of the fourth positioning element 145 match the dimensions of the second guide element 132. Generally, the width of the fourth positioning element 145 is equal to the width of the second guide element 132.

[0200] The dimensions of the fourth positioning element 145 match those of the second positioning element 133. Generally, the width of the fourth positioning element 145 is smaller than the width of the second positioning element 133.

[0201] The number of fourth positioning elements 145 matches the number of fourth guide elements 144. Generally, the number of fourth positioning elements 145 is not greater than the number of fourth guide elements 144. That is, the number of fourth positioning elements 145 can be less than the number of fourth guide elements 144, and the number of fourth positioning elements 145 can be equal to the number of fourth guide elements 144.

[0202] In some embodiments, there are multiple fourth positioning elements 145. Each of the multiple fourth positioning elements 145 is disposed at the bottom end of a corresponding fourth guide element 144.

[0203] The longitudinal section of the structure formed by the fourth positioning element 145 and the fourth guiding element 144 is L-shaped or T-shaped.

[0204] In some of these embodiments, the fourth positioning element 145 includes, but is not limited to, a positioning ring groove, a positioning plate groove, etc.

[0205] The usage method of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here.

[0206] The technical effects of this embodiment are as follows:

[0207] 1) By utilizing the guiding coordination between the upper platform unit and the limiting unit, and the guiding coordination between the lower platform unit and the limiting unit, it is ensured that the upper platform unit and the lower platform unit move only in the vertical direction, and horizontal displacement of the upper platform unit and the lower platform unit is avoided.

[0208] Example 3

[0209] This embodiment relates to the femoral-tibial space measurement system of the present invention.

[0210] An illustrative embodiment of the present invention, such as Figure 10 As shown, a femoral-tibial space measurement system is used before osteotomy in knee replacement surgery, comprising a femoral-tibial space measuring device 100 as described in any of Examples 1 and 2, and a fluid source device 200. The fluid source device 200 is connected to the airbag unit 110 of the femoral-tibial space measuring device 100, and is used to supply fluid to the airbag unit 110 to inflate the airbag unit 110 and to extract fluid from the airbag unit 110 to deflate the airbag unit 110.

[0211] In some embodiments, the fluid source device 200 includes a pump element and a connector element. The connector element is disposed on the pump element and communicates with the interface element 113 of the airbag unit 110.

[0212] In some of these embodiments, the fluid source device 200 includes, but is not limited to, a pressure pump, such as a handheld PID pressure pump.

[0213] In some embodiments, there are multiple femoral-tibial space measuring devices 100, which are distributed in the joint space of the femur and tibia.

[0214] The number of fluid source devices 200 matches the number of femoral-tibial space measuring devices 100. Generally, the number of fluid source devices 200 is no greater than the number of femoral-tibial space measuring devices 100. That is, the number of fluid source devices 200 is less than the number of femoral-tibial space measuring devices 100, or the number of fluid source devices 200 is equal to the number of femoral-tibial space measuring devices 100.

[0215] In some embodiments, there is one fluid source device 200, which is connected to several femoral-tibial space measuring devices 100 and independently controls each of the devices. Specifically, the fluid source device 200 includes several connector elements. Each connector element is connected to the interface element 113 of the corresponding airbag unit 110.

[0216] Generally, the number of connector elements is equal to the number of femoral-tibial space measuring devices 100.

[0217] In some embodiments, there are multiple fluid source devices 200, and each fluid source device 200 is connected to a corresponding femoral-tibial space measuring device 100 for independently controlling the corresponding femoral-tibial space measuring device 100.

[0218] Furthermore, the femoral-tibial interosseous space measurement system also includes a flexible connection device 300. The first end of the flexible connection device 300 is detachably connected to the airbag unit 110 of the femoral neck interosseous space measurement device, and the second end of the flexible connection device 300 is detachably connected to the fluid source device 200 for supplying fluid flow.

[0219] The number of flexible connecting devices 300 matches the number of femoral-tibial space measuring devices 100. Generally, the number of flexible connecting devices 300 is equal to the number of femoral-tibial space measuring devices 100.

[0220] The number of flexible connecting devices 300 matches the number of fluid source devices 200. Generally, the number of flexible connecting devices 300 is not less than the number of fluid source devices 200. That is, the number of flexible connecting devices 300 is greater than the number of fluid source devices 200, or the number of flexible connecting devices 300 is equal to the number of fluid source devices 200.

[0221] In some embodiments, there are multiple flexible connection devices 300, with the first end of each flexible connection device 300 being detachably connected to the airbag unit 110 of the corresponding femoral neck interosseous space measuring device, and the second end of each flexible connection device 300 being detachably connected to the corresponding fluid source device 200.

[0222] This embodiment includes the following implementation methods:

[0223] 1) The femoral-tibial space measuring device 100 is one unit, the fluid source device 200 is one unit, and the flexible connection device 300 is one unit;

[0224] 2) There are two femoral-tibial space measuring devices 100, one fluid source device 200, and two flexible connection devices 300;

[0225] 3) There are two femoral-tibial space measuring devices 100, two fluid source devices 200, and two flexible connection devices 300.

[0226] In some of these embodiments, the flexible connection device 300 includes, but is not limited to, a silicone hose.

[0227] The usage method of this embodiment is basically the same as that of Embodiments 1 to 2.

[0228] In this embodiment, the use of two femoral-tibial space measuring devices 100 is described as an example. The method of use in this embodiment is as follows:

[0229] (I) Gap Measurement

[0230] One femoral-tibial space measuring device 100 is placed in the medial malleolus joint space, and the other femoral-tibial space measuring device 100 is placed in the lateral malleolus joint space; or, one femoral-tibial space measuring device 100 is placed at the smaller position of the femoral-tibial joint space, and the other femoral-tibial space measuring device 100 is placed at the larger position of the femoral-tibial joint space.

[0231] Fluid (such as liquid or gas) is injected into the two airbag elements 111 respectively, so that the two airbag elements 111 expand in the vertical direction under the action of the corresponding limiting element 141;

[0232] At this time, the two upper platform elements 121 move upward under the action of the corresponding airbag elements 111, and the two lower platform elements 131 move downward under the action of the corresponding airbag elements 111.

[0233] When the pressure of the two airbag elements 111 after the infusion fluid reaches the preset pressure value (or the pressure of the two upper platform elements 121 after contact with the femur reaches the preset pressure value, or the pressure of the two lower platform elements 131 after contact with the tibia reaches the preset pressure value), the real-time gap value can be obtained, which facilitates subsequent osteotomy operations.

[0234] (II) Evacuation

[0235] After the measurement (or surgery) is completed, the fluid in the two balloon elements 111 is drained, and then the two femoral-tibial space measuring devices 100 are removed.

[0236] Dispose of the two femoral-tibial space measuring devices 100 in the medical waste collection location.

[0237] The technical effects of this embodiment are basically the same as those of Embodiments 1 and 2, and will not be repeated here.

[0238] Example 4

[0239] This embodiment relates to the knee joint surgery system of the present invention.

[0240] An illustrative embodiment of the present invention, such as Figure 11 As shown, a knee joint surgery system includes a femoral-tibial space measuring device 100 as described in any of Embodiments 1-2 or a femoral-tibial space measuring system as described in Embodiment 3, a femoral tracer device 400, and a tibial tracer device 500. The femoral tracer device 400 is fixed to the femur to track its spatial position in real time; the tibial tracer device 500 is fixed to the tibia to track its spatial position in real time.

[0241] In some embodiments, the femoral tracer device 400 includes, but is not limited to, a femoral tracer, which is a commonly used device in this technical field and will not be described in detail here.

[0242] In some embodiments, the tibial tracer device 500 includes, but is not limited to, a tibial tracer, which is a commonly used device in this technical field and will not be described in detail here.

[0243] like Figure 12 As shown, the usage method of this embodiment is as follows:

[0244] The femoral tracer is fixed to the femur, and the tibial tracer is fixed to the tibia;

[0245] After the orthopedic surgical robot completes the intraoperative registration and other operations (the step before the osteotomy), the femoral-tibial space measuring device 100 (ultra-thin capsule) is inserted into the joint space of the femoral and tibia. The fluid source device 200 (handheld PID pressure pump) is activated, and the required output air pressure value is adjusted so that the pressure value generated by the femoral-tibial space measuring device 100 (ultra-thin capsule) reaches the preset value. The real-time joint space value is read through the navigation system.

[0246] (a) First method of use

[0247] Before osteotomy, the preoperative planning of the orthopedic surgical robot determines that the gap between the medial and lateral condyles and the tibial plateau is L1 when the patient is in the flexed position.

[0248] At this point, the femoral-tibial space measuring device 100 is inserted into the medial and lateral condyle joint space. By injecting pressure into the airbag element 111, the real-time space value of the medial and lateral condyles is observed under the orthopedic surgical robot navigation system. When the lateral space value reaches the planned value L1, the pressure value P1 and the medial and lateral condyle space value L2 at this time are recorded (normally, human ligaments are tighter on the inside and looser on the outside). At this time, the difference between L1 and L2 is the joint pressure space value affected by the medial and lateral soft tissues.

[0249] Similarly, the pressure value P2 and the intercondylar gap value L3 and intercondylar gap value L4 are obtained in the straightened state.

[0250] The problem can then be corrected by adjusting the preoperative planning, including adjusting the internal and external rotation of the femoral prosthesis and the posterior tilt of the tibial plateau.

[0251] This procedure alters the shape of the osteotomy, allowing the soft tissues to achieve a natural balance post-surgery.

[0252] (II) Second method of use

[0253] Before osteotomy, the femoral-tibial space measuring device 100 is inserted into the medial and lateral condyle joint space through preoperative planning of the orthopedic surgical robot. Pressure is injected into the airbag element 111 to make the pressure on the upper and lower surfaces reach P1. The knee joint is swung to make it in different postures. The real-time space value of the medial and lateral condyles is observed through the robot navigation system.

[0254] During flexion, the intercondylar and medial condylar space values ​​L1 and L2 are read (normally, human ligaments are tighter on the inside and looser on the outside). During extension, the intercondylar and medial condylar space values ​​L3 and L4 are read.

[0255] At this point, the difference between L1 and L2, and between L3 and L4, represents the joint pressure gap value affected by the inner and outer soft tissues.

[0256] Next, by adjusting the preoperative planning, the internal and external rotation of the femoral prosthesis and the posterior tilt of the tibial plateau can be adjusted to balance the pressure gap at different positions.

[0257] This procedure alters the shape of the osteotomy, allowing the soft tissues to achieve a natural balance post-surgery.

[0258] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A femoral-tibial space measuring device for use before osteotomy in knee replacement surgery, characterized in that, include: The airbag unit is used to communicate with a fluid source and to perform fluid injection or fluid discharge operations under the action of the fluid source. An upper platform unit is disposed on the upper part of the airbag unit and is used to reciprocate in the vertical direction under the action of the airbag unit. A lower platform unit is disposed at the lower part of the airbag unit and is removably disposed in the joint space between the femur and tibia. A limiting unit is provided between the upper platform unit and the lower platform unit. The limiting unit contains the airbag unit, which is used to restrict the airbag unit to expand or contract only in the vertical direction. A pressure monitoring unit is provided in at least one of the airbag unit, the upper platform unit, and the lower platform unit, and is used to monitor pressure; The initial thickness of the femoral-tibial space measuring device is ≤4mm.

2. The femoral-tibial space measuring device according to claim 1, characterized in that, The airbag unit includes: An airbag element is disposed inside the limiting unit and located between the upper platform unit and the lower platform unit. It is used to perform fluid injection or fluid discharge operations under the action of a fluid source to drive the upper platform unit to reciprocate in the vertical direction. A conveying element, the first end of which is connected to the airbag element for supplying fluid source flow; An interface element is disposed at the second end of the conveying element for connecting to a fluid source device so that the fluid source device supplies fluid to the airbag element through the conveying element and extracts fluid from the airbag element through the conveying element.

3. The femoral-tibial space measuring device according to claim 1, characterized in that, The upper platform unit includes: An upper platform element, disposed above the airbag unit and above the limiting unit, is used for reciprocating motion in the vertical direction under the action of the airbag unit; and / or The lower platform unit includes: The lower platform element is disposed at the lower part of the airbag unit and the lower part of the limiting unit, and is used to reciprocate in the vertical direction under the action of the airbag unit.

4. The femoral-tibial space measuring device according to claim 3, characterized in that, The upper platform unit also includes: A first guide element is disposed at the bottom end of the upper platform element and is movably connected to the limiting unit to assist the upper platform element in reciprocating motion in the vertical direction. A first positioning element is disposed at the bottom end of the first guide element and is movably connected to the limiting unit to prevent the first guide element from separating from the limiting unit; and / or The lower platform unit also includes: The second guide element is disposed at the top of the lower platform unit and is movably connected to the limiting unit to assist the lower platform element in reciprocating motion in the vertical direction. The second positioning element is disposed at the top of the second guide element and is movably connected to the limiting unit to prevent the second guide element from separating from the limiting unit.

5. The femoral-tibial space measuring device according to claim 1, characterized in that, The limiting unit includes: A limiting element is provided between the upper platform unit and the lower platform unit. The airbag unit is provided inside the limiting element to restrict the airbag unit to inflate or contract only in the vertical direction.

6. The femoral-tibial space measuring device according to claim 5, characterized in that, The limiting unit further includes: A third guide element is disposed on the limiting element and is movably connected to the upper platform unit to assist the upper platform unit in reciprocating motion in the vertical direction; A third positioning element, disposed at the end of the third guide element and movably connected to the upper platform unit, is used to prevent the upper platform unit from separating from the third guide element; and / or A fourth guide element is disposed on the limiting element and is movably connected to the lower platform unit to assist the lower platform unit in reciprocating motion in the vertical direction. A fourth positioning element is disposed at the end of the fourth guide element and is movably connected to the lower platform unit to prevent the lower platform unit from separating from the fourth guide element.

7. A femoral-tibial interosseous space measurement system for use before osteotomy in knee replacement surgery, characterized in that, include: The femoral-tibial space measuring device as described in any one of claims 1 to 6; A fluid source device is connected to the airbag unit of the femoral-tibial space measuring device for supplying fluid to the airbag unit to inflate the airbag unit and extracting fluid from the airbag unit to contract the airbag unit.

8. The femoral-tibial interstitial space measurement system according to claim 7, characterized in that, The femoral-tibial space measuring device comprises several units, which are distributed and arranged in the joint space of the femoral and tibia.

9. The femoral-tibial space measurement system according to claim 8, characterized in that, The fluid source device is one, and each fluid source device is connected to a plurality of femoral-tibial space measuring devices, and each fluid source device independently controls a plurality of femoral-tibial space measuring devices; or There are several fluid source devices, and each of the several fluid source devices is connected to a corresponding femoral-tibial space measuring device for independently controlling the corresponding femoral-tibial space measuring device.

10. A knee joint surgical system, characterized in that, include: The femoral-tibial space measuring device as described in any one of claims 1 to 6, or the femoral-tibial space measuring system as described in any one of claims 7 to 9; A femoral tracer is used to be fixed to the femur to track the spatial position of the femur in real time. Tibial tracer, used to be fixed to the tibia to track the spatial position of the tibia in real time.

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