A replaceable ceramic tip connection structure for a medical instrument

Abstract

The application relates to the technical field of medical devices, in particular to a replaceable ceramic head connecting structure suitable for medical devices; the replaceable ceramic head connecting structure comprises a ceramic head body, a metal transition ring, a connecting base, a quick locking mechanism and a sealing mechanism, the metal transition ring is covered and fixed on a connecting end through a covering section, the connecting base is arranged at the front end of the medical device and is fixed, an inner part is provided with a receiving cavity, an inner wall of the receiving cavity is provided with an anti-rotation surface, the metal transition ring is detachably arranged in the receiving cavity and is limited in the circumferential direction through cooperation of an anti-rotation section and the anti-rotation surface; the quick locking mechanism comprises locking grooves arranged in locking sections and locking assemblies arranged on the side walls of the connecting base, axial positioning is realized through cooperation of the locking assemblies and the locking grooves, and the sealing mechanism is arranged in a sealing section to realize sealed connection between the metal transition ring and the connecting base; the application can protect the fragile body of the ceramic head, realizes quick and reliable replacement, has a model identification function and has excellent sealing performance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to a replaceable ceramic head connection structure adapted to medical devices. Background Technology

[0002] In minimally invasive surgeries such as urology, otolaryngology, and orthopedics, ceramic tips are widely used as working ends in medical devices such as plasma surgical electrodes and radiofrequency ablation electrodes. Precision ceramics, such as alumina, silicon nitride, zirconium oxide, and their composite materials, have excellent insulation, high-temperature stability, wear resistance, corrosion resistance, and biocompatibility. They can effectively isolate high-frequency currents, prevent tissue adhesion, and ensure the safety of the surgery.

[0003] However, existing technologies for connecting ceramic tips to metal instrument bodies often have certain problems: Most existing ceramic tips and metal substrates are bonded together using high-temperature sintering or adhesive bonding. While this method provides a reliable connection, the ceramic tip is a consumable component; once it wears out or breaks, the entire instrument must be discarded, resulting in extremely high costs and the inability to replace the ceramic tip individually, failing to meet the clinical need for replaceable high-value consumables. Some detachable connection structures directly machine internal and external threads onto the ceramic part and screw it into the metal base. However, ceramic materials are brittle and have low tensile strength, leading to high stress concentration at the root of the threads during assembly and surgical procedures. Combined with the temperature difference generated by high-temperature sterilization, this greatly increases the risk of thread chipping, ceramic cracking, or even intraoperative breakage, posing serious safety hazards.

[0004] Furthermore, during surgery, ceramic tips used in different procedures are similar in size, and existing connection structures lack effective physical anti-misinstallation mechanisms and model identification, posing a risk of incorrect or misinstallation. In addition, the sealing performance of existing detachable and replaceable structures is usually insufficient for the needs of irrigation and aspiration surgery, which can easily lead to liquid seepage into the instrument, causing short circuits or corrosion. Therefore, there is an urgent need for a replaceable ceramic tip connection structure that is compatible with medical devices, which can protect the brittle body of the ceramic tip, enable quick and reliable replacement, and also have model identification function and excellent sealing performance. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the background art and provide a replaceable ceramic head connection structure adapted to medical devices, which can protect the brittle body of the ceramic head, enable quick and reliable replacement, and also have model identification function and excellent sealing performance.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A replaceable ceramic head connection structure adapted to medical devices includes a ceramic head body, a metal transition ring, a connecting base, a quick-locking mechanism, and a sealing mechanism. The front end of the ceramic head body is the surgical working end, and the rear end is the connecting end. The outer wall of the metal transition ring is sequentially provided with a covering section, an anti-rotation section, a locking section, and a sealing section along the axial direction. The metal transition ring is covered and fixed to the connecting end by the covering section. The connecting base is disposed at and fixed to the front end of the medical device and has a receiving cavity inside. The inner wall of the receiving cavity is provided with an anti-rotation surface. The metal transition ring is detachably disposed in the receiving cavity and achieves circumferential limiting through the anti-rotation section cooperating with the anti-rotation surface. The quick-locking mechanism includes a locking groove disposed in the locking section and a locking assembly disposed on the side wall of the connecting base. The locking assembly cooperates with the locking groove to achieve axial positioning. The sealing mechanism is disposed in the sealing section to achieve a sealed connection between the metal transition ring and the connecting base.

[0007] Preferably, the ceramic head body is made of alumina, zirconium oxide or silicon nitride ceramic, and at least one annular connecting groove is provided on the outer wall of the connecting end. The inner wall of the covering section on the metal transition ring is provided with a convex ring that mates with the connecting groove, and the two form a mechanical fit.

[0008] Preferably, the anti-rotation section has a non-circular cross-section, and the cross-sectional shape of the anti-rotation surface on the inner wall of the connecting base is the same as that of the anti-rotation section. Furthermore, the anti-rotation sections of ceramic head assemblies corresponding to different surgical instruments or departments have different cross-sectional shapes to achieve physical prevention of misassembly. The outer wall of the anti-rotation section is also provided with several axial ribs, and the inner wall of the anti-rotation surface is provided with several axial grooves. The metal transition ring can only be inserted when the number and position of the axial ribs and the axial grooves match to achieve model identification.

[0009] Preferably, the locking assembly includes a pressing ring, a spring, and several locking beads. The outer wall of the connecting base is provided with a support portion that protrudes outward in the circumferential direction, and the outer wall of the base is also provided with several placement holes arranged in a circumferential array for placing the locking beads. The pressing ring is sleeved on the outer wall of the connecting base.

[0010] Preferably, the inner wall of the pressing ring is provided with a relief portion, an abutment portion and a movable portion in sequence along the axial direction. The spring is disposed in the movable portion, with one end fixedly connected to the end face of the supporting portion and the other end fixedly connected to the inner end face of the movable portion. The inner surface of the abutment portion fits against the outer wall of the connecting base, and the inner diameter of the relief portion is larger than the inner diameter of the abutment portion.

[0011] Preferably, the sealing mechanism includes a radial sealing ring and an axial sealing gasket. The radial sealing ring is embedded in the sealing ring groove of the sealing section, and its end face abuts against the inner wall of the connecting base. The axial sealing gasket is disposed in the receiving cavity of the connecting base, with one end abutting against the bottom of the receiving cavity and the other end abutting against the end face of the metal transition ring.

[0012] Preferably, the surface of the connecting end of the ceramic head body is provided with a conductive metallization layer, and the metal transition ring is electrically connected to the conductive metallization layer through the covering section; the sealing section of the metal transition ring is provided with an elastic conductive post, and a base electrode is correspondingly provided at the bottom of the receiving cavity; when the metal transition ring is locked, the elastic conductive post is connected to the base electrode.

[0013] Preferably, the ceramic head body has a first mounting portion and a second mounting portion sequentially formed along the axial direction at the connecting end, the inner diameter of the second mounting portion being larger than the inner diameter of the first mounting portion; a metal nesting ring is also coaxially arranged on the second mounting portion, and the ceramic head body is sleeved on the outer wall of the metal nesting ring through the second mounting portion.

[0014] Preferably, an elastic tensioning member is fixed to one end of the metal nesting ring facing the ceramic head body. The elastic tensioning member includes a tensioning section and a fixing section. The elastic tensioning member is fixedly connected to the metal nesting ring through the fixing section and is disposed in the first mounting part of the ceramic head body through the tensioning section. A tapered hole is also provided through the tensioning section.

[0015] Preferably, the metal nested ring has a through hole communicating with the tapered hole, and a tapered shaft is provided in the through hole. The tail end of the metal nested ring is also provided with an internal thread. The tail end of the tapered shaft is fixedly connected to the front end of the medical device. The tail end of the tapered shaft is provided with an external thread that is threadedly connected to the internal thread. The front end of the tapered shaft is also provided with a tapered tensioning head that extends into the tapered hole. The taper of the tapered hole is smaller than the taper of the tapered tensioning head.

[0016] Preferably, the working end of the ceramic head body is spherical, plunger-shaped, oblique-cut, or a specific curved surface shape, adaptable to the needs of surgical instruments such as orthopedic plasma ablation, urology, or electrocautery for ENT.

[0017] In summary, the beneficial effects of this invention are as follows: 1. The replaceable ceramic head connection structure adapted to medical devices described in this invention is fixedly connected to the tail end of the ceramic head through a metal transition ring, and mechanically fitted with a connecting groove through a convex ring, so that the assembly stress borne by the ceramic head connection structure is completely transferred to the metal transition ring, and the ceramic head body only bears uniform compressive stress, which fundamentally avoids the risk of cracking at the ceramic head connection part.

[0018] 2. The replaceable ceramic head connection structure adapted to medical devices described in this invention adopts an elastic quick-locking structure. Through the pressing ring and locking ball, the ceramic head and metal transition ring assembly can be disassembled and replaced, and the ceramic head assembly can be quickly replaced, meeting the surgical needs of quick replacement of consumables during surgery.

[0019] 3. The replaceable ceramic head connection structure adapted to medical devices described in this invention achieves dual protection against misinstallation of the ceramic head assembly through a combination of a non-circular anti-rotation cross section and an axial rib number coding. Geometrically, it ensures that ceramic head assemblies of different departments and functions cannot be misinstalled, and allows users to quickly identify the ceramic head model, significantly improving the safety of surgery.

[0020] 4. The replaceable ceramic head connection structure for medical devices described in this invention employs a dual sealing system of radial sealing rings and axial sealing gaskets, which can provide a reliable sealing barrier for surgical instruments and prevent bodily fluids from seeping into the instruments and causing corrosion; even if the sealing rings age during high-temperature sterilization, the axial sealing gaskets can still provide a reliable sealing environment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the replaceable ceramic head connection structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the overall assembly of the present invention; Figure 3 This is a schematic diagram of the connection end structure of the ceramic head body of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the metal transition ring and the connecting base of the present invention; Figure 5 This is a schematic diagram of the locking structure of the locking assembly of the present invention; Figure 6 This is a schematic diagram of the unlocking structure of the locking component of the present invention; Figure 7 This is a schematic diagram of the sealing mechanism of the present invention; Figure 8 This is a schematic diagram of the tensioning and fixing structure of the elastic tensioning component of the present invention; Figure 9 This is a schematic diagram of the relaxation structure of the elastic tensioning element of the present invention.

[0022] Markings in the diagram: 1. Ceramic head body; 11. Working end; 12. Connecting end; 121. Connecting groove; 13. Conductive metallization layer; 14. First mounting part; 15. Second mounting part; 2. Metal transition ring; 21. Covering section; 211. Protruding ring; 22. Anti-rotation section; 221. Axial rib; 23. Locking section; 24. Sealing section; 25. Elastic conductive post; 3. Connecting base; 31. Receiving cavity; 32. Anti-rotation surface; 321. Axial groove; 33. Support part; 34. Placement hole; 35. Base electrical... 4. Quick locking mechanism; 41. Locking groove; 42. Locking assembly; 421. Pressing ring; 4211. Relief part; 4212. Abutment part; 4213. Moving part; 422. Spring; 423. Locking ball; 5. Sealing mechanism; 51. Radial sealing ring; 52. Axial sealing gasket; 6. Metal nested ring; 61. Through hole; 62. Internal thread part; 7. Elastic tensioning element; 71. Tensioning section; 72. Fixed section; 73. Tapered hole; 8. Tapered shaft; 81. External thread part; 82. Tapered tensioning head. Detailed Implementation

[0023] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] according to Figures 1 to 7 As shown, a replaceable ceramic head connection structure adapted to medical devices includes a ceramic head body 1, a metal transition ring 2, a connecting base 3, a quick-locking mechanism 4, and a sealing mechanism 5. The front end of the ceramic head body 1 is a working end 11, and the rear end is a connecting end 12. The outer wall of the metal transition ring 2 is provided with a covering section 21, an anti-rotation section 22, a locking section 23, and a sealing section 24 in sequence along the axial direction. The metal transition ring 2 is covered and fixed to the connecting end 12 by the covering section 21. The connecting base 3 is disposed at and fixed to the front end of the medical device, and has internal components... A receiving cavity 31 is provided, and an anti-rotation surface 32 is provided on the inner wall of the receiving cavity 31. The metal transition ring 2 is detachably disposed in the receiving cavity 31 and is circumferentially limited by cooperating with the anti-rotation surface 32 through the anti-rotation section 22. The quick locking mechanism 4 includes a locking groove 41 disposed in the locking section 23 and a locking component 42 disposed in the side wall of the connecting base 3. The locking component 42 is axially positioned by cooperating with the locking groove 41. The sealing mechanism 5 is disposed in the sealing section 24 to achieve a sealed connection between the metal transition ring 2 and the connecting base 3.

[0027] according to Figure 2 , Figure 3As shown, the ceramic head body 1 is made of alumina, zirconium oxide, or silicon nitride ceramic. At least one annular connecting groove 121 is provided on the outer wall of the connecting end 12. A protruding ring 211 that mates with the connecting groove 121 is provided on the inner wall of the covering section 21 of the metal transition ring 2, forming a mechanical fit. The front end of the ceramic head body 1 is the working end 11, used for direct radial diagnosis or surgical operations, and the rear end is the connecting end 12, used for assembly with the metal transition ring 2. The ceramic head body 1 possesses excellent wear resistance, corrosion resistance, and biocompatibility, making it suitable for use with medical devices. In this application environment, an annular connecting groove 121 is provided on the outer wall of the connecting end 12 of the ceramic head body 1. The protruding ring 211 inside the metal transition ring 2 covering section 21 is inserted into the connecting groove 121 to form a mechanical fit, which enhances the bonding strength between the ceramic head body 1 and the metal transition ring 2, prevents axial detachment and relative rotation, and through this mechanical fit structure, the metal transition ring 2 can bear all the mechanical connection load, avoiding the brittle ceramic head body 1 from directly bearing the thread stress or locking impact force, thus improving the safety of the ceramic head body 1 during use.

[0028] according to Figure 4 As shown, the anti-rotation section 22 has a non-circular cross-section. The cross-sectional shape of the anti-rotation surface 32 connecting the inner wall of the base 3 is the same as that of the anti-rotation section 22. Different surgical instruments or departments have different cross-sectional shapes for their corresponding ceramic head assemblies to prevent misassembly. The outer wall of the anti-rotation section 22 is also provided with several axial ribs 221, and the inner wall of the anti-rotation surface 32 is provided with several corresponding axial grooves 321. The metal transition ring 2 can only be inserted when the number and position of the axial ribs 221 match those of the axial grooves 321, thus enabling model identification. The non-circular cross-sectional shape of the anti-rotation section 22 includes one of the following shapes: double-flat, triangular, quadrilateral, hexagonal, etc. The anti-rotation surface 32 has the same cross-sectional shape, which makes the installation of the connecting base 3 and the metal transition ring 2 completely compatible. For different surgical instruments and different departments, the anti-rotation section 22 of the ceramic head assembly and the anti-rotation surface 32 of the connecting base 3 are set with different cross-sectional shapes. Physical anti-misinstallation is achieved through the difference in shape. At the same time, several axial protrusions 221 are integrally formed on the outer wall of the anti-rotation section 22, and several axial grooves 321 are correspondingly opened on the inner wall of the anti-rotation surface 32. Only when the number and position of the axial protrusions 221 and the axial grooves 321 are completely matched can the metal transition ring 2 be smoothly inserted into the receiving cavity 31. This achieves accurate identification of product model and completely eliminates the problem of mixing different models and specifications of ceramic heads.

[0029] according to Figure 5 , Figure 6As shown, the locking assembly 42 includes a pressing ring 421, a spring 422, and several locking balls 423. A support portion 33 protrudes outward in the circumferential direction on the outer wall of the connecting base 3, and several placement holes 34 for placing the locking balls 423 are arranged in a circumferential array on its outer wall. The pressing ring 421 is sleeved on the outer wall of the connecting base 3. The inner wall of the pressing ring 421 has a clearance portion 4211, an abutment portion 4212, and a movable portion 4213 arranged sequentially in the axial direction. The spring 422 is disposed within the movable portion 4213, with one end fixedly connected to the end face of the support portion 33 and the other end fixedly connected to the inner end face of the movable portion 4213. The inner surface of the abutment portion 4212 fits against the outer wall of the connecting base 3, and the inner diameter of the clearance portion 4211 is larger than the inner diameter of the abutment portion 4212. The locking assembly 42 achieves locking by the locking balls 423 engaging and disengaging from the locking groove 41. The locking component 42 locks and unlocks the metal transition ring 2 on the connecting base 3. The pressing ring 421 of the locking component 42 is sleeved on the outer wall of the connecting base 3 and can slide back and forth along the axial direction of the connecting base 3. It automatically resets on the connecting base 3 by relying on the elastic force of the spring 422. When the spring 422 is in the natural state, the pressing ring 421 is in the extended state. At this time, the abutting part 4212 abuts against the locking ball 423 and presses the locking ball 423 into the locking groove 41 to lock the metal transition ring 2. When the pressing ring 421 on the connecting base 3 is pressed, the pressing ring 421 moves backward and compresses the spring 422. At this time, the yielding part 4211 moves to the position of the locking ball 423. The locking ball 423 can be pushed outward into the yielding part 4211, thereby disengaging from the locking groove 41 and unlocking the metal transition ring 2. Pulling out the metal transition ring 2 will disengage it from the connecting base 3.

[0030] according to Figure 7 As shown, the sealing mechanism 5 includes a radial sealing ring 51 and an axial sealing gasket 52. The radial sealing ring 51 is embedded in the sealing ring groove of the sealing section 24, and its end face abuts against the inner wall of the connecting base 3. The axial sealing gasket 52 is disposed in the receiving cavity 31 of the connecting base 3, with one end abutting against the bottom of the receiving cavity 31 and the other end abutting against the end face of the metal transition ring 2. The radial sealing ring 51 is embedded in the pre-set sealing ring groove of the sealing section 24, and its outer circular surface abuts tightly against the inner wall of the connecting base 3 to achieve radial sealing. The axial sealing gasket 52 is disposed between the metal transition ring 2 and the receiving cavity 31 of the connecting base 3, and abuts tightly against both to achieve axial end face sealing. The radial sealing prevents liquid from seeping in from the side, and the axial sealing prevents liquid from seeping in from the end face, forming a double sealing structure, which effectively blocks liquid and impurities from entering the connection gap, and has a better anti-leakage and anti-pollution effect.

[0031] according to Figure 7As shown, the surface of the connecting end 12 of the ceramic head body 1 is provided with a conductive metallization layer 13, and the metal transition ring 2 is electrically connected to the conductive metallization layer 13 through the covering section 21; the sealing section 24 of the metal transition ring 2 is provided with an elastic conductive post 25, and the bottom of the receiving cavity 31 is correspondingly provided with a base electrode 35. When the metal transition ring 2 is locked, the elastic conductive post 25 is connected to the base electrode 35; wherein, the metal transition ring 2 is electrically connected to the conductive metallization layer 13 through the covering section 21 in close contact. When the metal transition ring 2 is locked, the elastic conductive post 25 is compressed and shrinks and abuts tightly against the base electrode 35 to achieve conductivity, so that the ceramic head body 1, the metal transition ring 2 and the connecting base 3 form a complete conductive circuit. This structure allows the working end 11 of the ceramic head body 1 to integrate electrodes or sensors, meeting the conductivity requirements of electrosurgical medical devices for electrical signal transmission or electrosurgical functions.

[0032] Example 2

[0033] The difference from Embodiment 1 above is that, according to Figure 8 , Figure 9 As shown, a first mounting portion 14 and a second mounting portion 15 are sequentially formed along the axial direction inside the connecting end 12 of the ceramic head body 1. The inner diameter of the second mounting portion 15 is larger than that of the first mounting portion 14. A metal nesting ring 6 is also coaxially arranged on the second mounting portion 15. The ceramic head body 1 is fitted onto the outer wall of the metal nesting ring 6 through the second mounting portion 15. An elastic tensioning member 7 is fixed to one end of the metal nesting ring 6 facing the ceramic head body 1. The elastic tensioning member 7 includes a tensioning section 71 and a fixing section 72. The elastic tensioning member 7 is fixedly connected to the metal nesting ring 6 through the fixing section 72 and is disposed in the first mounting portion 14 of the ceramic head body 1 through the tensioning section 71. A tapered hole 73 is also formed through the tensioning section 71. The ceramic head body 1 is fitted onto the outer wall of the metal nesting ring 6 via the second mounting part 15. This structure provides an alternative connection and fixing method, especially suitable for ceramic head bodies 1 with slightly larger dimensions. The inner metal nesting ring 6 further enhances the structural strength of the ceramic head body 1 and prevents the ceramic end from cracking under stress. An elastic tensioning member 7 is fixedly connected to the end of the metal nesting ring 6. The elastic tensioning member 7 is disposed in the first mounting part 14 of the ceramic head body 1 via a tensioning section 71. The tensioning section 71 of the elastic tensioning member 7 can apply radial preload within the first mounting part 14 of the ceramic head body 1, eliminating the fit gap and making the ceramic head body 1 and the tensioning section 71 of the elastic tensioning member 7 tightly connected, further improving working stability.

[0034] A through hole 61 is provided inside the metal nested ring 6, communicating with a tapered hole 73. A tapered shaft 8 is provided inside the through hole 61. The tail end of the metal nested ring 6 is also provided with an internal thread 62. The tail end of the tapered shaft 8 is fixedly connected to the front end of the medical device. The tail end of the tapered shaft 8 is provided with an external thread 81, which is threadedly connected to the internal thread 62. The front end of the tapered shaft 8 is also provided with a tapered tensioning head 82, which extends into the tapered hole 73. The taper of the tapered hole 73 is smaller than the taper of the tapered tensioning head 82. The metal nested ring 6 is locked and fixed to the external thread 81 of the tapered shaft 8 by the internal thread 62 at its tail end. At this time, the tapered tensioning head 82 at the front end of the tapered shaft 8 extends into the tapered hole 73. The taper of the shaped hole 73 is smaller than that of the tapered tension head 82. When the thread is tightened, the tapered tension head 82 continuously squeezes the tapered hole 73, causing the tensioning section 71 of the elastic tensioning member 7 to expand outward and closely abut against the inner wall of the first mounting part 14, forming an internal tensioning and fixing structure to achieve a gapless and highly rigid connection. When it is necessary to disassemble and replace the ceramic head body 1, simply loosen the thread of the metal nesting ring 6 outward. At this time, the tapered tension head 82 gradually disengages from the tapered hole 73, causing the tensioning section 71 of the elastic tensioning member 7 to relax and disengage from the inner wall of the first mounting part 14, allowing the ceramic head body 1 to be pulled outward, thereby realizing the disassembly and replacement operation of the ceramic head body 1.

Claims

1. A replaceable ceramic head connection structure adapted to medical devices, characterized in that, The device includes a ceramic head body (1), a metal transition ring (2), a connecting base (3), a quick-locking mechanism (4), and a sealing mechanism (5). The front end of the ceramic head body (1) is a working end (11), and the rear end is a connecting end (12). The outer wall of the metal transition ring (2) is provided with a covering section (21), an anti-rotation section (22), a locking section (23), and a sealing section (24) in sequence along the axial direction. The metal transition ring (2) is covered and fixed to the connecting end (12) by the covering section (21). The connecting base (3) is set at the front end of the medical device and fixed. It has a receiving cavity (31) inside. The wall is provided with an anti-rotation surface (32). The metal transition ring (2) is detachably disposed in the receiving cavity (31) and is circumferentially limited by the anti-rotation section (22) cooperating with the anti-rotation surface (32). The quick locking mechanism (4) includes a locking groove (41) disposed in the locking section (23) and a locking assembly (42) disposed in the side wall of the connecting base (3). The locking assembly (42) cooperates with the locking groove (41) to achieve axial positioning. The sealing mechanism (5) is disposed in the sealing section (24) to achieve a sealed connection between the metal transition ring (2) and the connecting base (3).

2. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The ceramic head body (1) is made of alumina, zirconium oxide or silicon nitride ceramic. The outer wall of the connecting end (12) is provided with at least one annular connecting groove (121). The inner wall of the covering section (21) on the metal transition ring (2) is provided with a convex ring (211) that cooperates with the connecting groove (121). The two form a mechanical fit.

3. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The cross-section of the anti-rotation section (22) is non-circular. The cross-sectional shape of the anti-rotation surface (32) on the inner wall of the connecting base (3) is the same as that of the anti-rotation section (22). The anti-rotation section (22) of the ceramic head assembly corresponding to different surgical instruments or departments has different cross-sectional shapes to achieve physical anti-misinstallation. The outer wall of the anti-rotation section (22) is also provided with a number of axial ribs (221). The inner wall of the anti-rotation surface (32) is provided with a number of axial grooves (321). The metal transition ring (2) can only be inserted when the number and position of the axial ribs (221) match the axial grooves (321) to achieve model identification.

4. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The locking assembly (42) includes a pressing ring (421), a spring (422) and a number of locking beads (423). The outer wall of the connecting base (3) is provided with a support portion (33) that protrudes outward in the circumferential direction. The outer wall of the base is also provided with a number of placement holes (34) for placing the locking beads (423) in a circumferential array. The pressing ring (421) is sleeved on the outer wall of the connecting base (3).

5. The replaceable ceramic head connection structure for medical devices according to claim 4, characterized in that, The inner wall of the pressing ring (421) is provided with a relief part (4211), an abutment part (4212) and a movable part (4213) in sequence along the axial direction. The spring (422) is disposed in the movable part (4213), with one end fixedly connected to the end face of the support part (33) and the other end fixedly connected to the inner end face of the movable part (4213). The inner surface of the abutment part (4212) is in contact with the outer wall of the connecting base (3). The inner diameter of the relief part (4211) is larger than the inner diameter of the abutment part (4212).

6. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The sealing mechanism (5) includes a radial sealing ring (51) and an axial sealing gasket (52). The radial sealing ring (51) is embedded in the sealing ring groove of the sealing section (24), and its end face abuts against the inner wall of the connecting base (3). The axial sealing gasket (52) is disposed in the receiving cavity (31) of the connecting base (3), with one end abutting against the bottom of the receiving cavity (31) and the other end abutting against the end face of the metal transition ring (2).

7. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The ceramic head body (1) has a conductive metallization layer (13) on the surface of the connecting end (12). The metal transition ring (2) is electrically connected to the conductive metallization layer (13) through the covering section (21). The metal transition ring (2) has an elastic conductive post (25) on the sealing section (24). The receiving cavity (31) has a base electrode (35) at the bottom. When the metal transition ring (2) is locked, the elastic conductive post (25) is connected to the base electrode (35).

8. The replaceable ceramic head connection structure for medical devices according to claim 1, characterized in that, The ceramic head body (1) has a first mounting part (14) and a second mounting part (15) sequentially opened along the axial direction in the connecting end (12). The inner diameter of the second mounting part (15) is larger than the inner diameter of the first mounting part (14). A metal nesting ring (6) is also coaxially arranged on the second mounting part (15). The ceramic head body (1) is sleeved on the outer wall of the metal nesting ring (6) through the second mounting part (15).

9. The replaceable ceramic head connection structure for medical devices according to claim 8, characterized in that, An elastic tensioning member (7) is fixed on one end of the metal nesting ring (6) facing the ceramic head body (1). The elastic tensioning member (7) includes a tensioning section (71) and a fixing section (72). The elastic tensioning member (7) is fixedly connected to the metal nesting ring (6) through the fixing section (72) and is disposed in the first mounting part (14) of the ceramic head body (1) through the tensioning section (71). A tapered hole (73) is also provided through the tensioning section (71).

10. A replaceable ceramic head connection structure for adapting to medical devices according to claim 9, characterized in that, The metal nested ring (6) has a through hole (61) that communicates with the tapered hole (73). A tapered shaft (8) is provided in the through hole (61). The tail end of the metal nested ring (6) is also provided with an internal thread (62). The tail end of the tapered shaft (8) is fixedly connected to the front end of the medical device. The tail end of the tapered shaft (8) is provided with an external thread (81) that is threadedly connected to the internal thread (62). The front end of the tapered shaft (8) is also provided with a tapered tensioning head (82) that extends into the tapered hole (73). The taper of the tapered hole (73) is smaller than the taper of the tapered tensioning head (82).

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