Depth limiter for surgical equipment

Abstract

A depth limiter for surgical equipment disclosed by the present invention comprises a body, a probe assembly and a locking mechanism, the body is provided with a through hole, and the probe assembly penetrates through the through hole and is slidably connected with the body along the length direction. The locking mechanism enables the probe assembly to be switched between an unlocking state and a locking state relative to the body by rotating at least part of the locking mechanism; when the probe assembly is in the unlocking state, the probe assembly can slide relative to the body along the length direction; when the probe assembly is in the locking state, the probe assembly cannot slide relative to the body in the length direction. Unlocking and locking are easy through a rotating mode, and meanwhile, the extending end of the probe assembly is kept stable after locking; the probe and the supporting structure form the probe assembly, so that the stability of the probe can be kept; the length of the extending end can be easily and accurately adjusted through the ruler and the multiple clamping teeth arranged at intervals.

Description

Technical Field

[0001] The present invention relates to the technical field of surgical equipment, and in particular to a depth stopper used for surgical equipment. Background Art

[0002] In brain laser ablation surgery, the penetration depth of the laser probe is one of the most important indicators. If the laser probe is inserted beyond the treatment depth planned before the operation, it may cause irreversible damage to the patient. Therefore, the role of the depth limiter that limits the insertion depth of the laser probe is very significant. This device can lock the depth of the laser probe during surgery and prevent the probe and laser energy from entering unplanned areas, so as to better protect patient safety.

[0003] Currently, the probes on the market are mainly locked and unlocked by a snap button. When the snap button is pressed, a large force is required, and corresponding vibration will be generated, which affects the accuracy of the probe insertion depth. In addition, the cantilevers on both sides of this depth limiter are long. When the stroke reaches the maximum, the supporting force of the depth limiter is very small, which affects the accuracy of the probe insertion angle.

[0004] Therefore, there is an urgent need for a depth stopper that is easy to unlock and lock while being inserted with guaranteed accuracy. Summary of the invention

[0005] In order to solve the problem that the depth stopper is not easy to unlock and lock and the insertion accuracy is not easy to stably control in the above background technology, the present invention provides the following technical solutions:

[0006] A depth stopper for surgical equipment comprises a body, a probe assembly and a locking mechanism connected to the body, wherein the body is provided with a through hole, the probe assembly penetrates the through hole and is slidably connected to the body along a length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least a portion of the locking mechanism;

[0007] When in the unlocked state, the probe assembly can slide relatively with respect to the body along the length direction; when in the locked state, the probe assembly cannot slide relatively with respect to the body along the length direction.

[0008] Preferably, the through hole is circular, and the portion of the probe assembly penetrating the through hole has a circular cross section.

[0009] Preferably, the probe assembly comprises a shell, a diameter changer and a probe, the shell comprises a radial connection portion and a circumferential side wall, the probe, the diameter changer, the radial connection portion and the circumferential side wall are fixedly connected in sequence; the shell is sleeved on the body.

[0010] Preferably, the front end of the body is provided with a front end groove and a guide side wall connected to the front end groove, and the inner wall of the shell is provided with a guide groove, and the guide groove extends along the length direction until it passes through the radial connection part;

[0011] The guide side wall and the guide groove are inserted and matched so that the probe assembly and the body are slidably connected along the length direction.

[0012] Preferably, the front end of the body is provided with two oppositely disposed front end grooves and two oppositely disposed guide side walls connected to the two front end grooves, and the two guide side walls are provided with convex strips;

[0013] The inner wall of the shell is provided with two guide grooves arranged opposite to each other, and the bottoms of the two guide grooves are further provided with a sink groove, and the guide groove and the sink groove both extend along the length direction until they penetrate the radial connecting portion;

[0014] The convex strip and the countersunk groove cooperate to limit the circumferential movement of the probe assembly relative to the body.

[0015] Preferably, the locking mechanism comprises a rotation stop cap, and the rotation stop cap is rotatably connected to the rear end of the housing, so that the rotation stop cap can only rotate relative to the housing in the circumferential direction;

[0016] A rack is provided on the inner wall of the screw-in cap, and a plurality of latch teeth are arranged on the main body at preset intervals along the length direction. A rear end of the shell is provided with a rear end first groove for accommodating the plurality of latch teeth, so that the shell can slide relatively with respect to the main body in the length direction; the preset distance is adapted to the thickness of the rack, so that when the rack is screwed into the latch tooth gap, the shell cannot slide relatively with respect to the main body in the length direction; and when the rack is screwed out of the latch tooth gap, the shell can slide relatively with respect to the main body in the length direction.

[0017] Preferably, the inner wall of the rotation stop cap is further provided with a limiting portion, and the limiting portion and the rack are arranged at intervals in the circumferential direction;

[0018] The main body is also provided with a locking strip, and the locking strip and the plurality of locking teeth are arranged at intervals in the circumferential direction of the main body; a rear end of the shell is provided with a rear second groove for accommodating the locking strip, so that the shell can slide relative to the main body in the length direction;

[0019] When the locking cap is rotated along the first direction until the limiting portion touches the locking strip, the rack is rotated out of the locking tooth gap, and the shell can slide relatively with respect to the main body in the length direction; when the locking cap is rotated along the second direction until the rack touches the locking strip, the rack is rotated into the locking tooth gap, and the shell cannot slide relatively with respect to the main body in the length direction; the first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction.

[0020] Preferably, the cross-sections of the limiting portion and the locking strip are triangular, and the cross-sections are perpendicular to the length direction;

[0021] The projections of the plurality of latching teeth in the length direction fall within the projection of the latching strip in the length direction;

[0022] The rack, the limiting portion, the plurality of latching teeth, the latching strip, the rear first groove, and the rear second groove are each provided in two groups and are relatively symmetrically arranged.

[0023] Preferably, the front end of the body is provided with a front end groove and a guide side wall connected to the front end groove, the inner wall of the shell is provided with a guide groove, and the guide groove extends along the length direction until it passes through the radial connecting portion; the guide side wall and the guide groove are interlaced and matched so that the probe assembly and the body are slidably connected along the length direction;

[0024] The screw-on cap is provided with a blocking portion, and / or one end of the convex strip adjacent to the screw-on cap is provided with an undercut portion to prevent the screw-on cap from being separated from the body.

[0025] Preferably, the depth stopper further comprises a ruler, the ruler is detachably connected to an end of the body, and the end is away from a working end of the probe assembly;

[0026] The end is provided with a clamping button and a clamping spring, and the clamping button and the clamping spring cooperate to realize the conversion of the scale and the body between a fixed connection state and a disassembled state.

[0027] Preferably, the locking mechanism comprises a blade assembly and a top cover, the blade assembly comprises a plurality of blades, a side of the blade adjacent to the body is provided with a lower protrusion, and a side of the blade adjacent to the top cover is provided with an upper protrusion;

[0028] The lower protrusion is connected to the body;

[0029] The top cover is provided with a slide groove, the upper protrusion is connected to the slide groove, and the upper protrusion is movable in the slide groove;

[0030] A through hole is provided in the center of the top cover, the blade group forms a through hole, the size of the through hole is adjustable, and the probe assembly sequentially penetrates the through hole, the through hole and the through hole;

[0031] When the top cover is rotated at a preset angle relative to the body in a preset circumferential direction, the aperture of the through hole becomes smaller, and the blade group and the probe assembly achieve interference fit through the through hole, so that the probe assembly is in a locked state relative to the body; when the top cover is rotated at a preset angle relative to the body in a direction opposite to the preset circumferential direction, the aperture of the through hole becomes larger, so that the probe assembly is in an unlocked state relative to the body.

[0032] Preferably, the locking mechanism comprises an elastic washer, a pressure ring, and a bolt with a cover, wherein the elastic washer, the pressure ring, and the bolt with a cover are all provided with a central hole.

[0033] An internal threaded hole is provided on one side of the body adjacent to the protruding end of the probe assembly, and the probe assembly sequentially penetrates the body, the elastic washer, the pressure ring, and the bolt with cover and then protrudes;

[0034] The elastic washer is provided with an annular boss, and the pressure ring is provided with an annular groove;

[0035] When the covered bolt is rotated at a preset angle relative to the body in a preset circumferential direction, the covered bolt and the internal thread cooperate to press the elastic washer and the pressure ring into the internal thread hole, the annular groove presses the annular boss, and the annular boss acts on the probe assembly to make the probe assembly in a locked state relative to the body; when the covered bolt is rotated at a preset angle relative to the body in a direction opposite to the preset circumferential direction, the covered bolt and the internal thread cooperate to loosen the elastic washer and the pressure ring, and the annular groove loosens the annular boss, so that the probe assembly is in an unlocked state relative to the body.

[0036] Compared with the prior art, the beneficial effects of the present invention are: the probe assembly is switched between an unlocked state and a locked state relative to the body by rotating at least part of the locking mechanism, which is easy to unlock and lock, and the protruding end of the probe assembly remains stable after locking; the connection between the probe assembly and the body is more stable, avoiding the negative impact of the longer side cantilever; the probe assembly formed by the probe and the supporting structure is conducive to maintaining the stability of the probe; the length of the protruding end is easy to accurately adjust by setting a plurality of teeth with a ruler and at intervals. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 Schematic diagram of the axial structure of a depth stopper in one embodiment of the present invention.

[0039] Figure 2a Schematic diagram of the lateral structure of a depth limiter in one embodiment of the present invention.

[0040] Figure 2b for Figure 2a AA section diagram of .

[0041] Figure 2c for Figure 2b A partially enlarged cross-sectional schematic diagram of the region C is shown in FIG.

[0042] Figure 3 It is a schematic diagram of the structure of the main body in one embodiment of the present invention.

[0043] Figure 4 Schematic diagram of the structure of the screw cap in one embodiment of the present invention.

[0044] Figure 5 Schematic diagram of the structure of the housing in one embodiment of the present invention.

[0045] Figure 6 It is a schematic structural diagram of the main body and the rotation cap in an unlocked state in one embodiment of the present invention.

[0046] Figure 7 It is a schematic structural diagram of a body and a rotation cap in a locked state in one embodiment of the present invention.

[0047] Figure 8 It is a structural schematic diagram of the main body in another embodiment of the present invention.

[0048] Fig. 9 It is a schematic diagram of the structure of the blades in the locking mechanism in another embodiment of the present invention.

[0049] Fig.10 It is a schematic structural diagram of a top cover in a locking mechanism in another embodiment of the present invention.

[0050] Fig.11 It is a structural schematic diagram of a probe assembly in a locked state in another embodiment of the present invention.

[0051] Fig.12 It is a schematic structural diagram of a probe assembly in an unlocked state in yet another embodiment of the present invention.

[0052] Fig.13 FIG. 4 is a schematic structural diagram of a depth stopper in another embodiment of the present invention.

[0053] Fig.14 for Fig.13 AA section diagram of .

[0054] Fig.15 for Fig.14 A partially enlarged cross-sectional schematic diagram of the region D is shown in FIG. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] A depth stopper for surgical equipment comprises a body, a probe assembly and a locking mechanism connected to the body, wherein the body is provided with a through hole, the probe assembly penetrates the through hole and is slidably connected to the body along the length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least part of the locking mechanism; wherein the probe assembly comprises a probe and / or an auxiliary support portion, the probe penetrates the through hole and extends out, and the probe assembly and the body slide along the length direction to adjust the extension length; in some embodiments, a part of the locking mechanism is directly arranged on the body, and a part is a rotating portion, specifically, unlocking and locking can be achieved by operating the rotating portion.

[0057] When in the unlocked state, the probe assembly can slide relatively with respect to the body along the length direction; when in the locked state, the probe assembly cannot slide relatively with respect to the body along the length direction.

[0058] In some embodiments, the through hole is circular, and the portion corresponding to the probe assembly penetrating the through hole has a circular cross section. In some embodiments, it can also be an ellipse or other shapes.

[0059] Embodiment 1:

[0060] like Figure 1 and Figure 2a As shown, a depth stopper for surgical equipment includes a body 10, a probe assembly 222 and a locking mechanism connected to the body, the body is provided with a through hole, the probe assembly 222 penetrates the through hole and is slidably connected to the body 10 along the length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least part of the locking mechanism. Among them, the through hole is circular, and the part corresponding to the probe assembly penetrating the through hole is a circular cross-section. The probe assembly 222 includes a shell 20, a diameter changer 22 and a probe 21, the shell 20 includes a radial connection part 201 and a circumferential side wall, the probe 21, the diameter changer 22, the radial connection part 201 and the circumferential side wall 202 are fixedly connected in sequence; the shell is sleeved on the body 10.

[0061] In some embodiments, Figure 1 and Figure 3 As shown, the front end of the main body 10 is provided with a front end groove 101 and a guide side wall 111 connected to the front end groove 101, and the inner wall of the shell 20 is provided with a guide groove, which extends along the length direction until it passes through the radial connecting part 201; accordingly, during the sliding process, the guide side wall 111 can penetrate the radial connecting part 201 to slide in the length direction.

[0062] The guide side wall 111 and the guide groove are inserted and matched so that the probe assembly and the body 10 can be slidably connected along the length direction.

[0063] In some embodiments, Figure 1 and Figure 3 As shown, the front end of the body 10 is provided with two oppositely disposed front end grooves 101 and two oppositely disposed guide side walls 111 connected to the two front end grooves 101 , and the two guide side walls 111 are both provided with convex strips 1102 .

[0064] The inner wall of the shell is provided with two guide grooves arranged opposite to each other, and the bottoms of the two guide grooves are also provided with sink grooves, and the guide grooves and the sink grooves both extend along the length direction until they penetrate the radial connecting portion;

[0065] The convex strip 1102 and the countersunk groove cooperate to limit the circumferential movement of the probe assembly relative to the body 10 .

[0066] In some embodiments, Figure 1 and Figure 2a As shown, the locking mechanism includes a screw cap 30, which is rotatably connected to the rear end of the housing so that the screw cap can only rotate relative to the housing in the circumferential direction; Figure 2a , Figure 2b and Figure 2c As shown, the engagement groove 2501 and the buckle 3502 cooperate to allow the screw cap 30 to rotate in a circumferential direction relative to the housing 20 but cannot move in a longitudinal direction.

[0067] like Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, a rack 311 is provided on the inner wall of the screw-in cap 30, and a plurality of latch teeth 120 are arranged on the main body 10 at preset intervals along the length direction. A rear end of the shell is provided with a rear end first groove 2901 for accommodating the plurality of latch teeth 120, so that the shell 20 can slide relatively with respect to the main body 10 in the length direction; the preset distance is adapted to the thickness of the rack 311, so that when the rack 311 is screwed into the gap between the latch teeth 120, the shell 20 cannot slide relatively with respect to the main body 10 in the length direction; and when the rack 311 is screwed out of the gap between the latch teeth 120, the shell 20 can slide relatively with respect to the main body 10 in the length direction.

[0068] In some embodiments, Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the inner wall of the rotation stop cap 30 is further provided with a limiting portion 312, and the limiting portion 312 and the rack 311 are arranged at intervals in the circumferential direction;

[0069] The body 10 is also provided with a positioning strip 130, and the positioning strip 130 and the plurality of locking teeth 120 are arranged at intervals in the circumferential direction of the body 10; the rear end of the shell 20 is provided with a rear second groove 2902 for accommodating the positioning strip 130, so that the shell 20 can slide relative to the body 10 in the length direction;

[0070] like Figure 6 As shown, when the locking cap 30 rotates along the first direction until the limiting portion 312 touches the locking strip 130, the rack 311 rotates out of the gap between the locking teeth 120, and the housing 20 can slide relative to the body 10 in the length direction; Figure 7 As shown, when the screw-stop cap 30 rotates along the second direction until the rack 311 touches the locking strip 130, the rack 311 is screwed into the gap of the locking teeth 120, and the housing 20 cannot slide relative to the body 10 in the length direction; the first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction. Through the above two state restrictions, the relative rotation of the body 10 and the screw-stop cap 30 is limited to a fixed angle, and the two extreme states are respectively locked and opened, which is convenient for use.

[0071] In some embodiments, Figure 3 and Figure 4 As shown, the cross-section of the limiting portion 312 and the locking strip 130 is triangular, and the cross-section is perpendicular to the length direction;

[0072] The projections of the plurality of latching teeth in the length direction fall within the projection of the latching strip in the length direction;

[0073] The rack 311 , the limiting portion 312 , the plurality of latching teeth 120 , the latching strip 130 , the rear first groove 2901 , and the rear second groove 2902 are each provided in two groups and are relatively symmetrically arranged.

[0074] In some embodiments, Figure 1 , Figure 2a and Figure 3 As shown, the front end of the body 10 is provided with a front end groove 101 and a guide side wall 111 connected to the front end groove 101, and the inner wall of the housing 20 is provided with a guide groove, which extends along the length direction until it passes through the radial connecting portion 201; the guide side wall 111 and the guide groove are inserted and matched so that the probe assembly 222 and the body 10 can be slidably connected along the length direction;

[0075] The screw-on cap 30 is provided with a blocking portion, and / or an end of the convex strip adjacent to the screw-on cap is provided with an undercut portion to prevent the screw-on cap 30 from being separated from the body 10 .

[0076] Specifically, if Figure 3 As shown, the convex strip 1102 is arranged on the symmetrically arranged guide side wall 111, and the plurality of latch teeth 120 and the latch strip 130 are all arranged on the side wall of the body 10 extending from the front end groove 101 to the rear end in the length direction, so that the convex strip 1102, the plurality of latch teeth 120, and the latch strip 130 are staggered in the circumferential direction. Figure 4 As shown, a blocking portion 313 is provided in the circumferential gap area of ​​the screw-on cap, that is, the area outside the rack 311 and the limiting portion 312, to prevent the screw-on cap 30 from detaching from the main body 10 when the main body 10 slides to the limit state in the length direction relative to the shell 20. A buckle portion 117 is provided at one end of the screw-on cap 30 to reduce the size requirement of the blocking portion 313, and the gap between adjacent blocking portions 313 can be slightly increased, so that the screw-on cap 30 cannot be withdrawn from the main body 10. In this embodiment, the blocking portion 313 includes two adjacent bosses, and the gap between the two adjacent bosses is smaller than the buckle portion 117. At the same time, the gap between the adjacent bosses of the convex strip 1102 is smaller than the buckle portion 117; the gap between the adjacent bosses of the limiting portion 312 is smaller than the buckle portion 117; to ensure that the entire component can remain intact in any use state.

[0077] In some embodiments, Figure 2a As shown, the depth stopper further includes a ruler 40, the ruler 40 is detachably connected to the end of the body 10, and the end is away from the working end of the probe assembly;

[0078] A clamping button 41 and a clamping spring 42 are provided on the end, and the clamping button and the clamping spring cooperate to realize the conversion of the scale 40 and the body 10 between a fixed connection state and a disassembled state.

[0079] Specifically, when the ruler 40 is inserted from the middle, the clamping spring 42 is compressed to the left. When the ruler 40 is fully inserted, the position where the ruler 40 cooperates with the clamping button 41 is the neck of the ruler. The clamping button 41 cannot be kept on the left side. The clamping button 41 is rebounded to its original position by the clamping spring 42, and the ruler 40 is stuck. At this time, the depth of the probe can be read from the scale on the transparent ruler. After reading, the position of the probe is locked by turning the screw cap 30. When the ruler 40 needs to be removed, the clamping button 41 is pressed so that the ruler 40 can be freely pulled out.

[0080] Embodiment 2:

[0081] like Figure 8-Figure 12 As shown, a depth stopper for surgical equipment includes a body 3102, a probe assembly 339 and a locking mechanism connected to the body 3102, the body is provided with a through hole, the probe assembly 339 penetrates the through hole and is slidably connected to the body 3102 along the length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least part of the locking mechanism. The through hole is circular, and the portion corresponding to the probe assembly penetrating the through hole is a circular cross section.

[0082] The locking mechanism includes a blade assembly 555 and a top cover 3302. The blade assembly 555 includes a plurality of blades 3202. The blades 3202 are provided with a lower protrusion 3201 on one side adjacent to the body and an upper protrusion 3203 on one side adjacent to the top cover.

[0083] The lower protrusion 3201 is connected to the body 3102; the connecting column 3303 is connected to the connecting groove 3101, and the connecting column 3303 can slide in the connecting groove 3101, and the opposite limit positions correspond to the unlocked state and the locked state.

[0084] like Fig.10 As shown, the top cover 3302 is provided with a slide groove 3301, the upper protrusion 3203 is connected to the slide groove 3301, and the upper protrusion 3203 is movable in the slide groove 3301;

[0085] A through hole is provided in the center of the top cover 3302, and the blade assembly 555 forms a through hole, the size of the through hole is adjustable, and the probe assembly 339 penetrates the through hole, the through hole and the through hole in sequence;

[0086] like Fig.11 As shown, when the top cover 3302 rotates at a preset angle in a preset circumferential direction relative to the body 3102, the aperture of the through hole becomes smaller, and the blade assembly 555 and the probe assembly 339 are interference-fitted through the through hole, so that the probe assembly 339 is in a locked state relative to the body 3102; Fig.12As shown, when the top cover 3302 is rotated relative to the body 3102 by a preset angle in the opposite direction of the preset circumferential direction, the aperture of the through hole becomes larger, so that the probe assembly 339 is in an unlocked state relative to the body 3102.

[0087] Embodiment 3:

[0088] like Figure 13-Figure 15 As shown, a depth stopper for surgical equipment includes a body 4102, a probe assembly 4101 and a locking mechanism 4103 connected to the body, the body 4102 is provided with a through hole, the probe assembly 4101 penetrates the through hole and is slidably connected to the body 4102 along the length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least part of the locking mechanism. The through hole is circular, and the portion corresponding to the probe assembly penetrating the through hole is a circular cross section.

[0089] like Figure 13-Figure 15 As shown, the locking mechanism includes an elastic washer 430, a pressure ring 420, and a bolt with a cover 410. The elastic washer 430, the pressure ring 420, and the bolt with a cover 410 are all provided with a central hole.

[0090] An internal threaded hole is provided on one side of the body 4102 adjacent to the protruding end of the probe assembly 4101, and the probe assembly 4101 sequentially penetrates the body 4102, the elastic washer 430, the pressure ring 420, and the bolt with cover 410 and then protrudes;

[0091] The elastic washer 430 is provided with an annular boss, and the pressure ring 420 is provided with an annular groove;

[0092] When the covered bolt 410 is rotated at a preset angle in a preset circumferential direction relative to the main body 4102, the covered bolt 410 and the internal thread cooperate to press the elastic washer 430 and the pressure ring 420 into the internal thread hole, the annular groove presses the annular boss, and the annular boss acts on the probe assembly 4101 so that the probe assembly 4101 is in a locked state relative to the main body 4102; when the covered bolt 410 is rotated at a preset angle in the opposite direction to the preset circumferential direction relative to the main body, the covered bolt 410 and the internal thread cooperate to loosen the elastic washer 430 and the pressure ring 420, and the annular groove loosens the annular boss, so that the probe assembly 4101 is in an unlocked state relative to the main body 4102.

[0093] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is 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 can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A depth stop for surgical equipment, characterized in that: The invention comprises a body, a probe assembly and a locking mechanism connected to the body, wherein the body is provided with a through hole, the probe assembly penetrates the through hole and is slidably connected to the body along the length direction, and the locking mechanism enables the probe assembly to switch between an unlocked state and a locked state relative to the body by rotating at least a part of the locking mechanism; When in the unlocked state, the probe assembly can slide relatively with respect to the body along the length direction; when in the locked state, the probe assembly cannot slide relatively with respect to the body along the length direction.

2. The depth stopper according to claim 1, characterized in that: The through hole is circular, and the portion of the probe assembly penetrating the through hole has a circular cross section.

3. The depth stopper according to claim 2, characterized in that: The probe assembly comprises a shell, a diameter changer and a probe, the shell comprises a radial connection part and a circumferential side wall, the probe, the diameter changer, the radial connection part and the circumferential side wall are fixedly connected in sequence; the shell is sleeved on the body.

4. The depth stopper according to claim 3, characterized in that: The front end of the body is provided with a front end groove and a guide side wall connected to the front end groove, the inner wall of the shell is provided with a guide groove, and the guide groove extends along the length direction until it passes through the radial connection part; The guide side wall and the guide groove are inserted and matched so that the probe assembly and the body are slidably connected along the length direction.

5. The depth stopper according to claim 4, characterized in that: The front end of the body is provided with two front end grooves arranged opposite to each other and two guide side walls arranged opposite to each other and connected to the two front end grooves, and the two guide side walls are provided with convex strips; The inner wall of the shell is provided with two guide grooves arranged opposite to each other, and the bottoms of the two guide grooves are further provided with a sink groove, and the guide groove and the sink groove both extend along the length direction until they penetrate the radial connecting portion; The convex strip and the countersunk groove cooperate to limit the circumferential movement of the probe assembly relative to the body.

6. The depth stopper according to claim 1, characterized in that: The locking mechanism comprises a rotation stop cap, and the rotation stop cap is rotatably connected to the rear end of the housing so that the rotation stop cap can only rotate relative to the housing in the circumferential direction; The inner wall of the screw-stop cap is provided with a rack, and a plurality of latch teeth are arranged on the body at intervals of a preset distance along the length direction. The rear end of the shell is provided with a rear first groove for accommodating the plurality of latch teeth, so that the shell can slide relative to the body in the length direction; the preset distance is adapted to the thickness of the rack, so that when the rack is screwed into the latch tooth gap, the shell cannot slide relative to the body in the length direction; When the rack is rotated out of the tooth gap, the shell can slide relative to the body in the length direction.

7. The depth stopper according to claim 6, characterized in that: The inner wall of the rotation stop cap is also provided with a limiting portion, and the limiting portion and the rack are arranged at intervals in the circumferential direction; The main body is also provided with a locking strip, and the locking strip and the plurality of locking teeth are arranged at intervals in the circumferential direction of the main body; a rear end of the shell is provided with a rear second groove for accommodating the locking strip, so that the shell can slide relative to the main body in the length direction; When the rotation stop cap rotates along the first direction until the limiting portion touches the locking strip, the rack is rotated out of the locking tooth gap, and the housing can slide relative to the body in the length direction; When the rotation stop cap rotates along the second direction until the rack touches the locking strip, the rack is screwed into the locking tooth gap, and the housing cannot slide relative to the body in the length direction; The first direction is a clockwise direction or a counterclockwise direction, and the second direction is opposite to the first direction.

8. The depth stopper according to claim 7, characterized in that: The cross-sections of the limiting portion and the positioning strip are triangular, and the cross-sections are perpendicular to the length direction; The projections of the plurality of latching teeth in the length direction fall within the projection of the latching strip in the length direction; The rack, the limiting portion, the plurality of latching teeth, the latching strip, the rear first groove, and the rear second groove are each provided in two groups and are relatively symmetrically arranged.

9. The depth stopper according to claim 8, characterized in that: The front end of the body is provided with a front end groove and a guide side wall connected to the front end groove, the inner wall of the shell is provided with a guide groove, and the guide groove extends along the length direction until it passes through the radial connecting portion; the guide side wall and the guide groove are inserted and matched so that the probe assembly and the body can be slidably connected along the length direction; The screw-on cap is provided with a blocking portion, and / or one end of the convex strip adjacent to the screw-on cap is provided with an undercut portion to prevent the screw-on cap from being separated from the body.

10. The depth stopper according to claim 1, characterized in that: The depth stopper further comprises a ruler, the ruler is detachably connected to an end of the body, and the end is away from a working end of the probe assembly; The end is provided with a clamping button and a clamping spring, and the clamping button and the clamping spring cooperate to realize the conversion of the scale and the body between a fixed connection state and a disassembled state.

11. The depth stopper according to claim 2, characterized in that The locking mechanism includes a blade group and a top cover, the blade group includes a plurality of blades, a lower protrusion is provided on a side of the blade adjacent to the body, and an upper protrusion is provided on a side adjacent to the top cover; The lower protrusion is connected to the body; The top cover is provided with a slide groove, the upper protrusion is connected to the slide groove, and the upper protrusion is movable in the slide groove; A through hole is provided in the center of the top cover, the blade group forms a through hole, the size of the through hole is adjustable, and the probe assembly sequentially penetrates the through hole, the through hole and the through hole; When the top cover is rotated at a preset angle relative to the body in a preset circumferential direction, the aperture of the through hole becomes smaller, and the blade group and the probe assembly achieve interference fit through the through hole, so that the probe assembly is in a locked state relative to the body; when the top cover is rotated at a preset angle relative to the body in a direction opposite to the preset circumferential direction, the aperture of the through hole becomes larger, so that the probe assembly is in an unlocked state relative to the body.

12. The depth stopper according to claim 2, characterized in that The locking mechanism includes an elastic washer, a pressure ring, and a bolt with a cover. The elastic washer, the pressure ring, and the bolt with a cover are all provided with a central hole. An internal threaded hole is provided on one side of the body adjacent to the protruding end of the probe assembly. The probe assembly sequentially penetrates the body, the elastic washer, the pressure ring, and the bolt with a cover and then extends out; The elastic washer is provided with an annular boss, and the pressure ring is provided with an annular groove; When the covered bolt is rotated at a preset angle relative to the body in a preset circumferential direction, the covered bolt and the internal thread cooperate to press the elastic washer and the pressure ring into the internal thread hole, the annular groove presses the annular boss, and the annular boss acts on the probe assembly to make the probe assembly in a locked state relative to the body; when the covered bolt is rotated at a preset angle relative to the body in a direction opposite to the preset circumferential direction, the covered bolt and the internal thread cooperate to loosen the elastic washer and the pressure ring, and the annular groove loosens the annular boss, so that the probe assembly is in an unlocked state relative to the body.

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