Condylar test mold capable of measuring pressure

Abstract

The invention discloses a condylar test mold capable of measuring pressure, and relates to the technical field of medical instruments, the condylar test mold comprises a condylar test mold, a piezoresistive sensor, an intercondylar drill bushing and an intercondylar test mold, the condylar test mold and the piezoresistive sensor are assembled and combined, and when the condylar test mold with the piezoresistive sensor is started, the intercondylar drill bushing is inserted into the intercondylar test mold. The pressure value of the piezoresistive sensors at the same position can be displayed on the display in real time, when the condyle test mold is installed and in the process that an inner molded surface is attached to a bone, the reading of the piezoresistive sensors can be read, whether the condyle test mold is attached to the bone or not and whether the condyle test mold is installed obliquely or not can be checked, and the intercondylar drill bushing is arranged on the condyle test mold. The trephine and the square osteotome are driven into the intercondylar drill sleeve, the non-intercondylar position in the state is molded at the moment, the intercondylar test mold is arranged on the condylar test mold, the intercondylar test mold can be installed on the molded intercondylar, the reset result is finally confirmed, and the intercondylar drill sleeve has the effects of being accurate in installation and saving operation time.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a condyle test mold capable of measuring pressure. Background Art

[0002] Total knee replacement is a common surgical procedure for treating end-stage knee arthritis, severe deformity, or trauma, with over one million procedures performed annually worldwide. Balancing ligament tension is crucial during total knee replacement, requiring precise adjustment of soft tissue tension during surgery to avoid postoperative joint instability or stiffness.

[0003] Currently, total knee replacements follow a specific surgical procedure. At the end of the procedure, a condyle trial mold is installed on the femur and then aligned with a corresponding tibial mold to simulate the implant's internal repositioning, assessing stability and ligament tension. This assessment is typically based on the surgeon's experience and cannot be translated into tangible values ​​during surgery. Existing condyle trial molds are purely mechanical and lack sensor functionality, making them unable to accurately measure pressure distribution or ligament tension. This can lead to poor postoperative force alignment or abnormal patellar tracking.

[0004] In addition to conventional surgical instruments, navigation-assisted TKA and surgical robots can assist with surgery and improve osteotomy accuracy. However, these rely on optical and electromagnetic tracking, which are costly and complex to operate. They also do not effectively address the issue of ligament dynamic balance. Pressure-sensing gaskets can monitor ligament tension during reduction, but they are only suitable for tibial gasket testing and cannot assess femoral condyle contact mechanics. Summary of the Invention

[0005] The purpose of the present invention is to provide a condyle trial mold capable of measuring pressure, so as to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a condylar trial mold that can measure pressure, the condylar trial mold comprising a condylar trial mold, a piezoresistive sensor, an intercondylar drill sleeve and an intercondylar trial mold, the condylar trial mold being provided with a piezoresistive sensor, the intercondylar drill sleeve being provided on the condylar trial mold, the intercondylar trial mold being provided on the condylar trial mold, and during the installation of the condylar trial mold, the data displayed by the piezoresistive sensor can be read to check whether the condylar trial mold fits the bone and to judge whether the inner and outer sides of the condylar trial mold are installed in place, the intercondylar drill sleeve slides into the condylar trial mold to complete the shaping of the intercondylar position, the intercondylar trial mold is installed after the shaping is completed, and the reduction result is finally determined.

[0007] The piezoresistive sensor includes an anterior condyle medial sensor, a distal medial sensor and a posterior condyle medial sensor. The anterior condyle medial sensor is arranged on the inner side above the condyle trial mold, the distal medial sensor is arranged on the inner side of the center position of the condyle trial mold, and the posterior condyle medial sensor is arranged on the inner side below the condyle trial mold. The interior of the condyle trial mold is provided with an inner profile. When installing the condyle trial mold, the readings of the anterior condyle medial sensor, the distal medial sensor and the posterior condyle medial sensor are read to check whether the condyle trial mold fits the bone and whether there is any installation crookedness.

[0008] The piezoresistive sensor also includes a posterior condyle sensor and a distal sensor. The posterior condyle sensor is arranged on the outside below the condyle test mold, and the distal sensor is arranged on the outside of the center position of the condyle test mold. The distal sensor and the posterior condyle sensor are arranged on the outside of the condyle test mold. Therefore, the values ​​displayed by the distal sensor and the posterior condyle sensor can be used to determine whether the inner and outer sides of the condyle test mold can be installed in place.

[0009] The condylar trial mold is provided with an intercondylar side arm. After the position of the condylar trial mold is determined, intercondylar osteotomy can be performed according to different situations. A reciprocating saw can be used to perform intercondylar osteotomy along the intercondylar side wall.

[0010] The condyle trial mold is provided with a slide rail, the intercondyle drill sleeve is slidably connected to the slide rail, the intercondyle drill sleeve is provided with a square bone knife groove, and the intercondyle drill sleeve is provided with a ring drill hole. The intercondyle drill sleeve is slid into the condyle trial mold along the slide rail, and the ring drill is first driven in along the ring drill hole, and finally the square bone knife is used to drive in along the square bone knife groove. At this time, the shaping of the intercondyle position is completed.

[0011] The piezoresistive sensor also includes an anterior condyle sensor, which is arranged on the outside above the condyle test mold. The outside of the condyle test mold is provided with an outer curved surface. After the condyle test mold is installed, the values ​​detected by the anterior condyle sensor and the posterior condyle sensor are obtained.

[0012] The condyle trial mold is provided with a gasket trial mold, and the outer curved surface cooperates with the gasket trial mold to observe the pressure state of the joint in the extension position and the flexion position.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Combining the pressure sensor module with the condyle trial mold can observe the pressure inside and outside the condyle trial mold in real time during the model reduction, so as to intuitively judge whether the ligament tension meets the human body requirements, whether the osteotomy is in place, and whether the condyle trial mold is installed in place, ultimately ensuring the accurate installation of the prosthesis.

[0014] 2. The condylar trial mold and the intercondylar trial mold adopt a quick-connect split design. The condylar trial mold can be installed without cutting the intercondylar part. After the position of the condylar trial mold is determined, the intercondylar part can be cut according to the position of the condylar trial mold to ensure the accuracy of the intercondylar position and avoid repeated osteotomy and trimming.

[0015] 3. When the intercondylar trial mold is not installed, the intercondylar part can be cut through the middle feature of the condylar trial mold, or the intercondylar drill sleeve can be inserted and the intercondylar part can be cut with a trephine drill. Using a trephine drill to cut the intercondylar part is faster and saves operation time.

[0016] 4. The condylar and intercondylar trial molds are designed to be quickly combined and separated, so different forms of intercondylar prosthesis can be designed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention; Figure 2 A three-dimensional diagram of a condyle trial mold of the present invention; Figure 3 is an isometric view of the condyle trial mold of the present invention; Figure 4 A top view of the condyle trial mold of the present invention; Figure 5 A bottom view of the condyle trial mold of the present invention; Figure 6 It is a rear view of the condyle trial mold of the present invention; Figure 7 It is the installation diagram of the intercondylar trial mold of the present invention.

[0018] In the figure: 1. Condylar trial mold; 2. Posterior condylar sensor; 3. Anterior condylar sensor; 4. Distal sensor; 5. Anterior condylar medial sensor; 6. Distal medial sensor; 7. Posterior condylar medial sensor; 8. Intercondylar side wall; 9. Intercondylar trial mold; 10. Intercondylar drill sleeve; 11. Slide rail; 12. Square bone knife groove; 13. Annular drill hole; 14. Inner surface; 15. Outer curved surface. DETAILED DESCRIPTION

[0019] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0020] Example: Figure 1-Figure 7 As shown, the present invention provides a technical solution, a condylar trial mold that can measure pressure, the condylar trial mold includes a condylar trial mold 1, a piezoresistive sensor, an intercondylar drill sleeve 10 and an intercondylar trial mold 9, the condylar trial mold 1 is provided with a piezoresistive sensor, the intercondylar drill sleeve 10 is provided on the condylar trial mold 1, and the intercondylar trial mold 9 is provided on the condylar trial mold 1. During the installation of the condylar trial mold 1, the data displayed by the piezoresistive sensor can be read to check whether the condylar trial mold 1 fits with the bone and whether the inner and outer sides of the condylar trial mold 1 are installed in place. The intercondylar drill sleeve 10 slides into the condylar trial mold to complete the shaping of the intercondylar position. After the shaping is completed, the intercondylar trial mold 9 is installed, and the reduction result is finally determined.

[0021] The piezoresistive sensor includes an anterior condyle medial sensor 5, a distal medial sensor 6, a posterior condyle medial sensor 7, a posterior condyle sensor 2, a distal sensor 4 and an anterior condyle sensor 3. The anterior condyle medial sensor 5 is arranged on the inner side above the condyle trial mold 1, the distal medial sensor 6 is arranged on the inner side of the center position of the condyle trial mold 1, and the posterior condyle medial sensor 7 is arranged on the inner side below the condyle trial mold 1. An inner profile 14 is provided inside the condyle trial mold 1. When installing the condyle trial mold 1, the readings of the anterior condyle medial sensor 5, the distal medial sensor 6 and the posterior condyle medial sensor 7 are read to check whether the condyle trial mold 1 fits into the bone and whether there is any installation crookedness.

[0022] The condyle sensor 2 is arranged on the outside below the condyle trial mold 1, and the distal sensor 4 is arranged on the outside of the center position of the condyle trial mold 1. Therefore, the values ​​displayed by the distal sensor 4 and the posterior condyle sensor 2 can be used to determine whether the inner and outer sides of the condyle trial mold 1 can be installed in place.

[0023] The anterior condyle sensor 3 is arranged on the outside of the condyle trial mold 1. The condyle trial mold 1 is provided with an outer curved surface 15 on the outside. After the condyle trial mold is installed, the values ​​detected by the anterior condyle sensor 3 and the posterior condyle sensor 2 are obtained.

[0024] A gasket test mold is provided on the condyle test mold 1. The outer curved surface 15 cooperates with the gasket test mold to observe the pressure state of the joint in the extension position and the flexion position.

[0025] The condylar trial mold 1 is provided with an intercondylar side arm 8. After the position of the condylar trial mold 1 is determined, intercondylar osteotomy can be performed according to different situations. A reciprocating saw can be used to perform intercondylar osteotomy along the intercondylar side wall 8.

[0026] The condylar trial mold 1 is provided with a slide rail 11, and the intercondylar drill sleeve 10 is slidably connected to the slide rail 11. The intercondylar drill sleeve 10 is provided with a square bone knife groove 12, and the intercondylar drill sleeve 10 is provided with a ring drill hole 13. The intercondylar drill sleeve 10 is slid into the condylar trial mold 1 along the slide rail 11, and the ring drill is first driven in along the ring drill hole 13, and finally the square bone knife is used to drive in along the square bone knife groove 12. At this time, the shaping of the intercondylar position is completed.

[0027] Working principle of the present invention: The piezoresistive sensor is installed on the condyle test mold 1. By squeezing the sensor, the pressure value can be displayed. When the condyle test mold 1 with the sensor is activated, a Bluetooth connection mode can be established. The pressure values ​​of the sensors in different parts of the body are displayed in real time on the display. At the same time, the test program can set the value to establish an appropriate pressure range. This range represents the normal pressure value for each part. Pressure values ​​outside the range are abnormal, which are indicated by a striking red indicator. The normal range is green.

[0028] After the four-in-one osteotomy is completed according to the surgical procedure for total knee replacement, the condyle trial mold 1 can be installed. At this moment, the inner surface 14 of the condyle trial mold 1 should be aligned with the surface of the four-in-one osteotomy of the distal femur. During the installation of the condyle trial mold 1, the readings of the anterior condyle medial sensor 5, the distal medial sensor 6 and the posterior condyle medial sensor 7 can be read to check whether the condyle trial mold 1 is aligned with the bone and whether there is any crooked installation. Because the distal sensor 4 and the posterior condyle sensor 2 are provided on the outside of the condyle trial mold 1, the values ​​displayed by the distal sensor 4 and the posterior condyle sensor 2 can be used to determine whether the inner and outer sides of the condyle trial mold 1 can be installed in place.

[0029] After the condyle test mold is installed, the outer curved surface is matched with the gasket test mold to observe the pressure state of the joint in the extension and flexion positions. The values ​​detected by the anterior condyle sensor 3 and the posterior condyle sensor 2 can be used to judge whether the installation position is in the appropriate ligament tension position at all times. If a striking red prompt appears, it can be adjusted according to the actual situation. If the final sensor values ​​are all in the green range, it is qualified.

[0030] After determining the position of the condylar trial mold 1, intercondylar osteotomy can be performed according to different situations. A reciprocating saw can be used to perform intercondylar osteotomy along the intercondylar side wall 8, or the intercondylar drill sleeve 10 can be slid into the condylar trial mold 1 along the slide rail 11, and a trephine drill is first used to drive it along the trephine hole 13, and finally a square bone knife is used to drive it along the square bone knife groove 12. At this time, the shaping of the intercondylar position is completed.

[0031] The intercondylar trial mold 9 can be installed on the intercondylar space after the shaping is completed, and the reduction result can be finally confirmed. The condylar trial mold is compatible with intercondylar structures of different internal shapes.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A condyle test mold capable of measuring pressure, characterized by: The condyle trial mold comprises a condyle trial mold (1), a piezoresistive sensor, an intercondylar drill sleeve (10), and an intercondylar trial mold (9); the condyle trial mold (1) is provided with a piezoresistive sensor, the intercondylar drill sleeve (10) is provided on the condyle trial mold (1), and the intercondylar trial mold (9) is provided on the condyle trial mold (1).

2. A condyle test mold capable of measuring pressure according to claim 1, characterized in that: The piezoresistive sensor comprises an anterior condyle medial sensor (5), a distal medial sensor (6) and a posterior condyle medial sensor (7), wherein the anterior condyle medial sensor (5) is arranged on the inner side above the condyle trial mold (1), the distal medial sensor (6) is arranged on the inner side of the center position of the condyle trial mold (1), and the posterior condyle medial sensor (7) is arranged on the inner side below the condyle trial mold (1), and an inner profile (14) is arranged inside the condyle trial mold (1).

3. A condyle test mold capable of measuring pressure according to claim 2, characterized in that: The piezoresistive sensor further comprises a posterior condyle sensor (2) and a distal sensor (4), wherein the posterior condyle sensor (2) is arranged on the outside below the condyle trial mold (1), and the distal sensor (4) is arranged on the outside of the center position of the condyle trial mold (1).

4. A condyle test mold capable of measuring pressure according to claim 1, characterized in that: The condylar trial mold (1) is provided with an intercondylar side arm (8).

5. The condyle test mold capable of measuring pressure according to claim 1, characterized in that: The condylar trial mold (1) is provided with a slide rail (11), the intercondylar drill sleeve (10) is slidably connected to the slide rail (11), the intercondylar drill sleeve (10) is provided with a square bone knife groove (12), and the intercondylar drill sleeve (10) is provided with a ring drill hole (13).

6. A condyle test mold capable of measuring pressure according to claim 2, characterized in that: The piezoresistive sensor further comprises an anterior condyle sensor (3), wherein the anterior condyle sensor (3) is arranged on the outside above the condyle trial mold (1), and an outer contour curved surface (15) is arranged on the outside of the condyle trial mold (1).

7. A condyle test mold capable of measuring pressure according to claim 1, wherein a gasket test mold is provided on the condyle test mold (1).

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