Lens film changing device of endoscope

Abstract

The invention discloses a lens film changing device for an endoscope, and the device comprises a housing which is connected with an inner sleeve and an outer sleeve; an inner cavity of the inner sleeve can allow the endoscope to pass through, and a film changing channel is arranged between the outer sleeve and the inner sleeve and is communicated with the inner cavity of the shell; the film unwinding reel and the film winding reel are mounted in the shell and can rotate around the axial direction of the film unwinding reel and the film winding reel; one end of the lens film is connected to the film unwinding reel in a winding manner, and the other end of the lens film is connected to the film winding reel in a winding manner; the part, located outside the film unwinding reel and the film winding reel, of the lens film penetrates through the film changing channel and passes through the end opening of the inner sleeve. And the mechanical driving piece is in direct or indirect transmission connection with the film winding reel and is used for driving the film winding reel to rotate forwards around the own axial direction so as to drive the lens film to pass through the end opening of the inner sleeve in sequence. The mechanical film changing mode does not need to take the endoscope out of the body for cleaning, so that the operation is simpler and more convenient; stable power supply is not needed in the membrane replacement process, and the safety in the operation process can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of laparoscopes, and in particular to a lens film changing device of a laparoscope. Background Art

[0002] One of the current trends in surgical operations is that surgical incisions are getting smaller and smaller, the wounds to the human body are getting smaller and smaller, and the precision of the surgery is getting higher and higher. When the surgical incision is reduced, the doctor's surgical field of view will be seriously affected. In order to solve this problem, the laparoscope came into being. The laparoscope is a thin cylindrical tubular structure with a lighting and a high-definition camera on the head. During the surgical operation, the doctor will use the laparoscope to observe the target area or use the laparoscope to provide a good surgical field of view to facilitate the operation.

[0003] During the above process, the laparoscope needs to be inserted into the human body for use. During use, because the human body temperature is higher than the surface temperature of the laparoscope, and the humidity inside the human body is high, a layer of water mist will form on the surface of the laparoscope, causing the image captured by the camera inside the laparoscope lens to be blurred, thereby affecting the surgical field of view and hindering the normal progress of the operation. At the same time, during the operation, tissue fluid will overflow from the human body. When the laparoscope is inserted into the human body and used, it will come into contact with the tissue fluid, causing the tissue fluid to adhere to the laparoscope lens, causing the image captured by the camera inside the laparoscope to be blurred, thereby affecting the surgical field of view and affecting the normal progress of the doctor's operation.

[0004] From the above, it can be seen that the main factors affecting the use of laparoscopes are: fogging of the laparoscope lens and adhesion of tissue fluid to the laparoscope lens. In order to solve the above problems, the current common practice is to disinfect and sterilize the laparoscope before using it. When using it, insert the laparoscope lens part into hot water to heat it for a period of time, then take the laparoscope out of the hot water, use gauze to wipe the water stains on the laparoscope lens, and then the doctor inserts the laparoscope into the human body for use. Since hot water can heat the laparoscope lens, the temperature of the laparoscope lens is higher than the internal temperature of the human body, which makes it difficult for water vapor at the surgical incision to adhere to the lens, so that water mist will not form in front of the lens, and ultimately ensure that it does not affect the normal shooting of the camera and protect the doctor's surgical field of view. However, during use, the tissue fluid inside the patient's body will still adhere to the laparoscope lens. In order to solve this problem, when using the laparoscope, it is necessary to take the laparoscope out of the patient's body at regular intervals, soak the laparoscope lens in hot water, and repeat the above process. This process makes the use of the laparoscope extremely cumbersome and inconvenient. The water temperature and soaking time used by different doctors are inconsistent, which affects the actual effect. At the same time, if the hot water used for soaking is contaminated or incompletely sterilized, it is very likely to contaminate the sterilized laparoscope, thereby causing infection to the patient. In addition, there are also methods such as using gas demisting devices and wiping the lens in the body to clean the lens. This method does not require the laparoscope to be removed, but the lens cannot be cleaned after being contaminated by tissue fluid, which still affects the imaging effect.

[0005] In order to better solve the problem of lens fogging and lens contamination by tissue fluid, there is also a technical solution in the prior art that covers the front of the laparoscope lens with a lens film, and then uses a motor to drive the lens film to change its position to replace the lens film in front of the lens. This electric film replacement technical solution does not require the laparoscope to be frequently removed from the body, and the operation process is relatively simple. However, in addition to the motor, this electric film replacement solution also requires the installation of electronic components such as a control board that controls the operation of the motor. Not only is the cost relatively high, but the motor film replacement method requires a stable power supply. Once the power supply fluctuates or the motor and other electronic components fail, it will affect the surgical process and even cause surgical safety issues. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the electric film replacement method in the laparoscope requires an external power supply, has high requirements on the stability of the power supply, has a high failure rate and poor safety, thereby providing a laparoscope lens film replacement device.

[0007] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A lens film replacement device for a cavity mirror, comprising:

[0009] A shell, the shell is connected with an inner sleeve and an outer sleeve sleeved on the outer periphery of the inner sleeve; the inner cavity of the inner sleeve can be passed through by a laparoscope or the inner sleeve is a part of the laparoscope, a membrane replacement channel is provided between the outer sleeve and the inner sleeve, and the membrane replacement channel is communicated with the inner cavity of the shell;

[0010] The film unwinding reel and the film winding reel are installed in the inner cavity of the shell and are both rotatable around their own axes;

[0011] A lens film, one end of which is wound and connected to the film unwinding reel, and the other end of which is wound and connected to the film taking-up reel; a portion of the lens film located outside the film unwinding reel and the film taking-up reel passes through the film changing channel and through the end opening of the inner sleeve;

[0012] The mechanical driving member is directly or indirectly connected to the film winding reel, and is used to drive the film winding reel to rotate in the positive direction around its own axis, so as to drive the lens film to pass through the end opening of the inner sleeve in sequence and be wound on the film winding reel.

[0013] Furthermore, the film unwinding reel is connected to a tensioning member for driving the film unwinding reel to rotate in the opposite direction so as to keep the lens film in a tensioned state; a rotation limiter is provided between the film winding reel and the shell for limiting the reverse rotation of the film winding reel to release the lens film.

[0014] Furthermore, the tensioning member includes a coil spring housing fixed in the housing, and a coil spring accommodated in the coil spring housing, and a central portion of the coil spring is fixedly connected to the film unwinding reel.

[0015] Furthermore, the rotation limiting member includes a ratchet that rotates synchronously with the film collecting reel, and a ratchet limiting structure arranged in the shell; the outer periphery of the ratchet is provided with a plurality of circumferentially arranged ratchet teeth, and the ratchet limiting structure cooperates with the ratchet teeth to limit the reverse rotation of the film collecting reel.

[0016] Further, the ratchet limiting structure is a pawl connected to the shell and with one end extending toward the ratchet; or the inner wall of the shell is provided with a receiving groove for accommodating the ratchet, and the ratchet limiting structure is a plurality of inclined guide grooves arranged on the wall of the receiving groove.

[0017] Furthermore, the mechanical driving component includes a knob which is fixedly connected to the film winding reel and has one end extending out of the shell.

[0018] Furthermore, the film winding reel is fixedly connected to a gear that rotates synchronously with the film winding reel, and a slide groove is provided in the shell; the mechanical driving component includes a rack that is slidably connected to the slide groove and meshes with the gear for transmission, and a paddle that is fixedly connected to the rack and one end of which extends out of the shell.

[0019] Furthermore, a baffle plate located at one end of the slide slot is provided in the shell, and an elastic member in an elastically compressed state is provided between the rack and the baffle plate.

[0020] Furthermore, the shell is provided with a through hole for the laparoscope to pass through, and one end of the inner sleeve extending into the shell is arranged corresponding to the position of the through hole. An inner sleeve fixing member for fixing the inner sleeve is provided in the shell.

[0021] Furthermore, the inner sleeve fixing device includes a ring sleeved on the outer periphery of the inner sleeve, an open groove is provided on one side of the ring, and an elastic arm is formed in the open groove, one end of which is fixedly connected to the ring and the other end is suspended in the air; a locking member is threadedly connected to the shell, one end of which applies pressure to the elastic arm and the other end extends out of the shell; the locking member is used to drive the elastic arm to bend into the ring to lock the laparoscope in the ring.

[0022] Furthermore, one end of the inner sleeve away from the shell is detachably connected to an inner lens end cover for providing support for the lens membrane.

[0023] Furthermore, one end of the outer sleeve away from the shell is detachably connected to a lens outer end cover which is sleeved on the outer periphery of the lens inner end cover.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The lens film changing device of the laparoscope provided by the present invention is provided with a film unwinding reel and a film taking-up reel in a shell, one end of the lens film is wound and connected to the film unwinding reel, and the other end is wound and connected to the film taking-up reel, and the part of the lens film located outside the film unwinding reel and the film taking-up reel passes through the film changing channel between the inner sleeve and the outer sleeve and through the end opening of the inner sleeve; when in use, the laparoscope is inserted into the inner cavity of the inner sleeve, at which time the lens located at the head of the laparoscope is located at the end opening of the inner sleeve, the lens film is blocked on the outside of the lens, and then the inner sleeve and the outer sleeve of the laparoscope and the lens film changing device are extended into the human body together. As the operation progresses, the laparoscope imaging quality is observed; if the field of vision is unclear or there are foreign objects in the lens, the mechanical drive is driven by external force to move, and the mechanical drive drives the film reel to rotate forward around its own axis through mechanical transmission. At this time, the film release reel releases the lens film, and the film reel reels the lens film. The position of the lens film in front of the laparoscope lens changes, and the originally used lens film is moved away from the position directly opposite the laparoscope lens, and the originally unused lens film moves to the position directly opposite the laparoscope lens, so that the lens film is replaced in the human body; by being able to repeat the mechanical film replacement process during the operation, the laparoscope lens can maintain a clear field of vision for a long time, ensuring the laparoscope imaging quality. This lens film replacement device is not only simple in structure, but also does not need to remove the laparoscope lens from the body for cleaning, and is easier to operate; and compared with the existing electric film replacement method, this mechanical film replacement method does not require the installation of electronic components such as motors and control boards, so the production cost is lower. More importantly, a stable power supply is not required during the film replacement process, which avoids the influence of power supply fluctuations or failures of electronic components such as motors on the surgical process, and can improve the safety during the operation.

[0026] 2. The lens film changing device of the laparoscope provided by the present invention has a tensioning member connected to the film unwinding reel for driving the film unwinding reel to rotate in the opposite direction, and a rotation limiter is provided between the film winding reel and the shell to limit the reverse rotation of the film winding reel; during the mechanical film changing process, the setting of the tensioning member can keep the lens film in a tensioned state at all times, avoiding problems such as loosening and wrinkling of the lens film during the film changing process; the setting of the rotation limiter can prevent the lens film from reversing under the action of the tensioning member.

[0027] 3. The lens film changing device of the laparoscope provided by the present invention adopts a tensioning member composed of a coil spring housing and a coil spring, which can continuously provide a large restoring force for the film unwinding reel in a narrow space.

[0028] 4. The lens film changing device of the laparoscope provided by the present invention adopts a rotation limiter composed of a ratchet and a ratchet limit structure. When the rotation limiter is located between two ratchet teeth on the ratchet, the ratchet cannot rotate in the reverse direction, thereby limiting the reverse rotation of the film winding reel and the lens film thereon.

[0029] 5. The lens film changing device of the laparoscope provided by the present invention has a rotation limiting structure with a ratchet pawl or a ratchet inclined guide groove, which can not only limit the reverse rotation of the lens film, but also limit the length of a single film change.

[0030] 6. The lens film changing device of the laparoscope provided by the present invention adopts a knob as a mechanical driving component, which has the advantages of simple structure and easy operation.

[0031] 7. The lens film changing device of the cavity mirror provided by the present invention has a gear fixedly connected to the film taking-up reel and rotating synchronously with the film taking-up reel, a slide groove is arranged in the shell, a rack is slidably connected to the slide groove and meshes with the gear for transmission, a toggle plate is fixedly connected to the rack and one end extends out of the shell; the mechanical driving part adopts a structural form of a combination of a rack and a toggle plate, which has the advantages of simple structure and easy operation; and the structural form of the gear and rack coordination can make the rack rotate only one tooth spacing at a time when the toggle plate is toggled, and the corresponding gear and the film taking-up reel only rotate synchronously by a very small angle, so that the length of a single film change can be limited to a very short length, which is beneficial to increasing the number of times the lens film is changed.

[0032] 8. In the laparoscope lens film changing device provided by the present invention, the elastic force of the elastic part in the slide groove on the rack can form a certain obstruction when the toggle plate is moved, thereby preventing the toggle plate and the rack from sliding too long at one time, and avoiding the lens film from moving too far at one time, which would cause part of the unused lens film to move directly past the use position opposite to the laparoscope lens, thereby reducing the waste of the effective utilization length of the lens film.

[0033] 9. The lens film changing device of the laparoscope provided by the present invention, the arrangement of the inner sleeve fixing part in the shell can fix the inner sleeve at a position directly opposite to the through hole, so as to facilitate the insertion of the laparoscope into the interior of the inner sleeve from the through hole of the shell; the arrangement of the elastic wall on the ring and the locking part on the shell can fix the laparoscope on the shell.

[0034] 10. The lens film changing device of the laparoscope provided by the present invention has a structural design in which the inner end cover of the lens is detachably connected to the end of the inner sleeve, so that the inner end cover of the lens with different inclination angles can be replaced according to laparoscopes of different specifications; the structural design in which the outer end cover of the lens is detachably connected to the end of the outer sleeve can protect the inner end cover and the lens film on the one hand, and can replace the inner end cover of the lens by removing the outer end cover of the lens on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the lens film replacement device in the first embodiment of the present invention;

[0037] Figure 2 An exploded view of the lens film replacement device in the first embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the internal structure of the lens film changing device after the first shell is hidden in the first embodiment of the present invention;

[0039] Figure 4 A cross-sectional view of the lens film replacement device in the first embodiment of the present invention Figure 1 ;

[0040] Figure 5 Schematic diagram of the structure of the coil spring housing and the coil spring in the first embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the connection relationship between the first housing, the ratchet and the knob in the first embodiment of the present invention;

[0042] Figure 7 It is a schematic structural diagram of the first housing and the ratchet wheel when they are separated in the first embodiment of the present invention;

[0043] Figure 8 A cross-sectional view of the lens film replacement device in the first embodiment of the present invention Figure 2 ;

[0044] Fig. 9 for Figure 8 The enlarged view of point A in the middle;

[0045] Fig.10 This is a schematic diagram of the connection structure of the inner sleeve, the inner end cover of the lens and the lens film in the first embodiment of the present invention;

[0046] Fig.11 This is a schematic diagram of the structure of the outer end cover of the lens in the first embodiment of the present invention;

[0047] Fig.12 It is a schematic diagram of the three-dimensional structure of the lens film replacement device in the second embodiment of the present invention;

[0048] Fig.13 is an exploded view of a lens film changing device in Embodiment 2 of the present invention;

[0049] Fig.14 A cross-sectional view of the lens film replacement device in the second embodiment of the present invention Figure 1 ;

[0050] Fig.15 It is a schematic structural diagram of the first shell, the fixed base, the film unwinding reel, the film winding reel, the tensioning member, and the ratchet in the second embodiment of the present invention.

[0051] Description of reference numerals: 10, housing; 10a, first housing; 10b, second housing; 101, through hole; 102, receiving groove; 103, inclined guide groove; 104, positioning seat; 105, mounting groove; 106, fixed base; 1061, ratchet; 1061, guide roller; 107, slide groove; 108, baffle; 109, transmission ring; 1091, transmission claw; 11, inner sleeve; 12, outer sleeve; 13, Inner sleeve fixing part; 131, sleeve ring; 132, elastic arm; 14, locking part; 20, film unwinding reel; 30, film winding reel; 40, lens film; 51, knob; 52, toggle plate; 53, gear; 54, rack; 55, elastic part; 60, tensioning part; 61, coil spring housing; 62, coil spring; 71, ratchet; 711, ratchet; 712, limit clamp; 80, inner end cover of lens; 90, outer end cover of lens. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. The terms "forward rotation" and "reverse rotation" have opposite rotation directions. For example, when "forward rotation" is clockwise rotation, "reverse rotation" is counterclockwise rotation; when "forward rotation" is counterclockwise rotation, "reverse rotation" is clockwise rotation. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Embodiment 1

[0057] like Figure 1 and Figure 2 The lens film changing device of a laparoscope shown comprises a housing 10, an inner sleeve 11, an outer sleeve 12, a film unwinding reel 20, a film winding reel 30, a lens film 40 and a mechanical driving component.

[0058] like Figure 1 and Figure 2 As shown, the shell 10 is formed by docking a first shell 10a and a second shell 10b, and the chamber enclosed by the first shell 10a and the second shell 10b is the inner cavity of the shell 10. The upper top wall of the shell 10 is provided with a through hole 101, and the through hole 101 is located at the docking position of the first shell 10a and the second shell 10b. The inner sleeve 11 and the outer sleeve 12 are both cylindrical structures with both ends penetrated. The inner sleeve 11 is coaxially arranged with the through hole 101 on the shell 10, and one end of the inner sleeve 11 is fixed to the upper top wall of the shell 10 by an inner sleeve fixing member 13, and the inner cavity of the inner sleeve 11 can allow the laparoscope to pass through. The inner sleeve fixing member 13 can fix the inner sleeve 11 at a position directly opposite to the through hole 101, so as to facilitate the laparoscope to be inserted into the interior of the inner sleeve 11 from the through hole 101 of the shell 10. One end of the outer sleeve 12 is fixedly connected to the lower bottom wall of the shell 10, and the outer sleeve 12 is coaxially sleeved on the outer periphery of the inner sleeve 11. Combined with Figure 8 and Fig. 9 The gap between the outer sleeve 12 and the inner sleeve 11 forms a membrane changing channel, and the inlet and outlet sections of the membrane changing channel are both connected to the inner cavity of the housing 10. In an alternative embodiment, the laparoscope and the lens membrane changing device can also be made into an integrated structure, in which case the inner sleeve 11 is the outer tube wall of the laparoscope.

[0059] like Figure 2 - Figure 4As shown, the film unwinding reel 20 and the film winding reel 30 are both installed in the inner cavity of the housing 10. The film unwinding reel 20 can be rotatably arranged around its own axis, and the film winding reel 30 can also be rotatably arranged around its own axis. The lens film 40 is specifically a transparent plastic film. One end of the lens film 40 is wound and connected to the film unwinding reel 20, and the other end is wound and connected to the film winding reel 30; Figure 8 and Fig. 9 The lens film 40 released by the film release reel 20 enters one side of the film change channel through the entrance end of the film change channel, and the lens film 40 enters the other side of the film change channel after passing through the end opening of the inner sleeve 11 away from the shell 10. Finally, the lens film 40 extends into the shell 10 again through the exit end of the film change channel and is rolled up on the film collection reel 30.

[0060] like Figure 2 - Figure 4 As shown, the mechanical driving member is specifically a knob 51, one end of which extends into the housing 10 and is fixedly connected to the film winding reel 30, and the other end extends out of the housing 10. The knob 51 is used to drive the film winding reel 30 to rotate forward around its own axis, so as to drive the lens film 40 to pass through the end opening of the inner sleeve 11 in sequence and be wound on the film winding reel 30.

[0061] The lens film changing device of the laparoscope is provided with a film unwinding reel 20 and a film winding reel 30 in a housing 10, one end of the lens film 40 is wound and connected to the film unwinding reel 20, and the other end is wound and connected to the film winding reel 30, and the part of the lens film 40 located outside the film unwinding reel 20 and the film winding reel 30 passes through the film changing channel between the inner sleeve 11 and the outer sleeve 12 and through the end opening of the inner sleeve 11. When in use, the laparoscope is inserted into the inner cavity of the inner sleeve 11, at which time the lens located at the head of the laparoscope is located at the end opening of the inner sleeve 11, and the lens film 40 is shielded outside the lens, and then the inner sleeve 11 and the outer sleeve 12 of the laparoscope and the lens film changing device are extended into the human body together. As the operation progresses, observe the quality of laparoscope imaging; if the field of vision is unclear or there is a foreign object in the lens, drive the knob 51 to rotate by external force. The knob 51 directly drives the film reel 30 to rotate in the positive direction around its own axis when rotating. At this time, the film release reel 20 releases the lens film 40, and the film reel 30 rewinds the lens film 40. The position of the lens film 40 in front of the laparoscope lens changes. The originally used lens film 40 moves away from the position directly opposite the laparoscope lens, and the originally unused lens film 40 moves to the position directly opposite the laparoscope lens, so that the lens film 40 is replaced in the human body. By being able to repeat the mechanical film replacement process during the operation, the laparoscope lens can maintain a clear field of vision for a long time, ensuring the quality of laparoscope imaging. This lens film changing device not only has a simple structure, but also does not require the laparoscope lens to be removed from the body for cleaning, making it easier to operate. Moreover, compared with the existing electric film changing method, this mechanical film changing method does not require the installation of electronic components such as motors and control boards, so the production cost is lower. More importantly, the film changing process does not require a stable power supply, avoiding the impact of power supply fluctuations or failures of electronic components such as motors on the surgical process, which can improve the safety of the surgical process.

[0062] like Figure 6 As shown, the inner wall of the first housing 10a is provided with a mounting groove 105 protruding outward; Figure 2 - Figure 4 As shown, one end of the inner sleeve fixing member 13 is fixed on the mounting groove 105 of the first shell 10a; the inner sleeve fixing member 13 includes a collar 131 sleeved on the outer periphery of the inner sleeve 11, and an open groove is provided on one side of the collar 131, and an elastic arm 132 is formed in the open groove, with one end fixedly connected to the collar 131 and the other end suspended. A locking member 14 is threadedly connected to the second shell 10b, with one end pressing on the elastic arm 132 and the other end extending out of the shell 10, and the locking member 14 is used to drive the elastic arm 132 to bend into the collar 131 to lock the laparoscope in the collar 131; the locking member 14 is specifically a locking nut. The arrangement of the elastic wall on the collar 131 and the locking member 14 on the shell 10 can fix the laparoscope on the shell 10.

[0063] like Figure 2 - Figure 4 As shown, the film unwinding reel 20 is connected with a tensioning member 60 for driving the film unwinding reel 20 to rotate in the opposite direction so as to keep the lens film 40 in a tensioned state. A rotation limiter is provided between the film winding reel 30 and the housing 10 for limiting the film winding reel 30 from rotating in the opposite direction so as to release the lens film 40. During the mechanical film changing process, the setting of the tensioning member 60 can keep the lens film 40 in a tensioned state at all times, thereby preventing the lens film 40 from being loosened or wrinkled during the film changing process; the setting of the rotation limiter can prevent the lens film 40 from being reversed under the action of the tensioning member 60.

[0064] like Figure 4 , Figure 5 and Figure 6 As shown, the tensioning member 60 includes a coil spring housing 61 fixed in the housing 10, and a coil spring 62 accommodated in the coil spring housing 61, and the central portion of the coil spring 62 is fixedly connected to the film unwinding reel 20. Specifically, the inner wall of the first housing 10a is provided with a positioning seat 104 protruding outward, and the outer dimensions of the positioning seat 104 match the outer dimensions of the coil spring housing 61, and the outer periphery of the positioning seat 104 is provided with a plurality of positioning protrusions protruding outward. The outer wall of the coil spring housing 61 is provided with a positioning slot that cooperates with the plurality of positioning protrusions, and the coil spring housing 61 and the positioning seat 104 on the first housing 10a fix the coil spring housing 61 through the cooperation of the positioning slot and the positioning protrusion, thereby preventing the coil spring housing 61 from rotating. The tensioning member 60 composed of the coil spring housing 61 and the coil spring 62 can continuously provide a large restoring force for the film unwinding reel 20 in a narrow space. In an alternative embodiment, the tensioning member 60 is not limited to the structure of the above-mentioned coil spring 62. For example, the tensioning member can also use multiple tension springs to pull the film unwinding reel 20 to rotate in the direction of winding the lens film 40 to keep the lens film 40 in a tensioned state.

[0065] like Figure 4 , Figure 6 , Figure 7 As shown, the rotation limiter includes a ratchet 71 and a ratchet limiter structure that cooperate with each other. The ratchet 71 rotates synchronously with the film winding reel 30, and the ratchet limiter structure is disposed in the housing 10; the ratchet limiter structure cooperates with the ratchet 71 to limit the reverse rotation of the film winding reel 30. The rotation limiter composed of the ratchet 71 and the ratchet limiter structure is adopted. When the rotation limiter is located between two ratchet teeth 711 on the ratchet 71, the ratchet 71 cannot rotate in the reverse direction, thereby limiting the reverse rotation of the film winding reel 30 and the lens film 40 thereon. In an alternative embodiment, the rotation limiter can also be a one-way bearing or a one-way limiter, as long as the rotation limiter can limit the reverse rotation of the film winding reel 30.

[0066] like Figure 4 , Figure 6 , Figure 7As shown, the central axis of the knob 51 passes through the central hole of the ratchet 71, and a limiting hole is provided on the central axis of the knob 51. A pair of limiting clamps 712 extending into the limiting hole are provided on one side of the ratchet 71; the ratchet 71 is connected to the central axis of the knob 51 through the pair of limiting clamps 712 to realize synchronous rotation of the two, and because the film winding reel 30 is fixed on the central axis of the knob 51, the ratchet 71 can rotate synchronously with the film winding reel 30. The outer periphery of the ratchet 71 is provided with a plurality of circumferentially arranged ratchet teeth 711; the inner wall of the first housing 10a is provided with a receiving groove 102 for accommodating the ratchet 71, and the ratchet limiting structure is a plurality of oblique guide grooves 103 provided on the groove wall of the receiving groove 102, and the opening directions of the plurality of oblique guide grooves 103 are all the same as the rotation direction of the ratchet 71. When the ratchet 71 rotates forward in the receiving groove 102, the ratchet teeth 711 can undergo a small amount of elastic deformation to move out of the oblique guide groove 103. This rotation limiting structure composed of multiple ratchet teeth 711 and multiple inclined guide grooves 103, when the ratchet wheel 71 rotates a certain angle, the ratchet teeth 711 will move into the corresponding inclined guide groove 103, and the inclined guide groove 103 will form a certain rotation damping force on the ratchet teeth 711. When the knob 51 is rotated, the ratchet teeth 711 and the film winding reel 30 can only rotate synchronously by a very small angle, which can not only limit the reverse rotation of the lens film 40, but also limit the length of a single film change, which is beneficial to limit the length of a single film change to a very short length, thereby increasing the number of times the lens film 40 can be used for film changes.

[0067] like Fig. 9 , Fig.10 and Fig.11 As shown, the end of the inner sleeve 11 away from the housing 10 is detachably connected to the inner lens end cap 80 that provides support for the lens membrane 40. Specifically, the inner lens end cap 80 is a cylindrical structure with openings at both ends, and the end surface of the inner lens end cap 80 away from the housing 10 is an inclined surface with a hollow middle, and the inner lens end cap 80 has multiple angle models, such as 0°, 30°, etc. The structural design of the inner lens end cap 80 being detachably connected to the end of the inner sleeve 11 can replace the inner lens end cap 80 with different inclination angles according to the laparoscopes of different specifications. In some embodiments, a guide structure for guiding the lens membrane 40 can also be provided on the outside of the inner lens end cap 80. The end of the outer sleeve 12 away from the housing 10 is detachably connected to the outer lens end cap 90 that is sleeved on the outer periphery of the inner lens end cap 80. Specifically, the lens outer end cap 90 is a cylindrical structure with openings at both ends, and the end surface of the lens outer end cap 90 away from the housing 10 is also a hollow inclined surface in the middle. The lens outer end cap 90 has a variety of models with different angles, just like the lens inner end cap 80. The structural design of the lens outer end cap 90 being detachably connected to the end of the outer sleeve 12 can protect the lens inner end cap 80 and the lens film 40 on the one hand, and can replace the internal lens inner end cap 80 by removing the lens outer end cap 90 on the other hand.

[0068] Embodiment 2

[0069] like Fig.12 , Fig.13 , Fig.14 and 15 As shown, the difference from the first embodiment is that a fixed base 106 is fixed on the inner bottom wall of the first shell 10a, and the fixed base 106 and the inner wall of the first shell 10a enclose a slide groove 107. The mechanical drive member includes a toggle plate 52, a gear 53 and a rack 54; the gear 53 and the rack 54 are both arranged in the shell 10, the gear 53 is fixedly connected to the film winding reel 30 and the film winding reel 30 rotates synchronously, the rack 54 is slidably connected to the slide groove 107 and meshes with the gear 53 for transmission; one end of the toggle plate 52 extending into the shell 10 is fixedly connected to the rack 54, and the other end extends out of the first shell 10a. The toggle plate 52 drives the film winding reel 30 to rotate in the positive direction around its own axis through the rack and gear structure, which can drive the lens film 40 to pass through the end opening of the inner sleeve 11 in sequence and be wound on the film winding reel 30. The mechanical drive component adopts a structural form of a combination of a rack 54 and a toggle plate 52, which has the advantages of simple structure and easy operation. Moreover, the gear 53 and the rack 54 cooperate with each other in a structural form. When the toggle plate 52 is toggled, the rack 54 can rotate only one tooth spacing at a time, and the corresponding gear 53 and the film winding reel 30 only rotate synchronously by a very small angle, which can limit the length of a single film change to a very short length, which is beneficial to increasing the number of times the lens film 40 is changed.

[0070] like Fig.12 , Fig.13 , Fig.14 and 15 As shown, a baffle 108 is provided at one end of the slide groove 107 in the housing 10, and an elastic member 55 in an elastically compressed state is provided between the rack 54 and the baffle 108; the elastic member 55 is specifically a spring. The elastic force of the elastic member 55 in the slide groove 107 on the rack 54 can form a certain obstruction when the toggle piece 52 is toggled, thereby preventing the toggle piece 52 and the rack 54 from sliding too far at one time, avoiding the lens film 40 from moving too far at one time, causing part of the unused lens film 40 to move directly past the use position directly opposite the laparoscope lens, and reducing the waste of the effective length of the lens film 40.

[0071] like Fig.14 As shown, the locking member 14 and the shifting piece 52 are both mounted on the same side of the first housing 10a for easy operation.

[0072] like Fig.13 , Fig.14 and 15As shown, the film winding reel 30 is coaxially fixedly connected to the side close to the gear 53 with the ratchet 71, and the gear 53 is coaxially fixed to the side close to the film winding reel 30 with the transmission ring 109, the outer diameter of the transmission ring 109 is larger than the outer diameters of the gear 53 and the ratchet 71, and the outer wall of the transmission ring 109 is integrally connected with a plurality of transmission claws 1091 extending inward, and the plurality of transmission claws 1091 extend into the tooth grooves of the ratchet 71. When the gear 53 rotates forward, the transmission ring 109 rotates forward synchronously with the gear 53, and the transmission ring 109 drives the ratchet 71 and the film winding reel 30 to rotate forward through the plurality of transmission claws 1091, and the lens film 40 is wound on the film winding reel 30, thereby realizing mechanical film replacement.

[0073] like Fig.14 and 15 As shown, the ratchet limiting structure is a pawl 1061 connected to the fixed base 106 and one end of which extends toward the ratchet 71, and the pawl 1061 has a certain elasticity. When the gear 53 and the film winding reel 30 rotate forward to wind up the lens film 40, the pawl 1061 undergoes a small amount of elastic deformation to allow the ratchet 71 to rotate; when the film winding reel 30 has a tendency to rotate in the reverse direction, the pawl 1061 extends into the tooth groove on the outer periphery of the ratchet 71 to limit the reverse rotation of the ratchet 71, thereby limiting the reverse rotation of the gear 53 and the film winding reel 30. In some embodiments, the ratchet 71 can also be provided on both the film winding reel 30 and the film unwinding reel 20, and the two ends of the fixed base 106 are respectively provided with pawls 1061 extending toward the corresponding ratchet 71.

[0074] like Fig.13 , Fig.14 and 15 As shown, two pairs of guide rollers 1062 are also connected to the fixed base 106, wherein one pair of guide rollers 1062 is arranged close to the film unwinding reel 20, and the other pair of guide rollers 1062 is arranged close to the film winding reel 30. The lens film 40 unwound by the film unwinding reel 20 is guided by the pair of guide rollers 1062 and enters the entrance end of the film changing channel, and the lens film 40 sent out from the exit end of the film changing channel is guided by the pair of guide rollers 1062 and then wound up by the film winding reel 30.

[0075] In summary, the laparoscope lens film replacement device provided by the present invention, when the laparoscope inserted into the human body has unclear vision or foreign matter in the lens, the knob 51 is driven to rotate or the toggle plate 52 is driven to slide by external force, and the knob 51 or the toggle plate 52 drives the film reel 30 to rotate positively around its own axis. At this time, the film release reel 20 releases the lens film 40, and the film reel 30 rewinds the lens film 40. The position of the lens film 40 in front of the laparoscope lens changes, and the originally used lens film 40 is moved away from the position directly opposite the laparoscope lens, and the originally unused lens film 40 is moved to the position directly opposite the laparoscope lens, so that the lens film 40 is replaced in the human body. By being able to repeat the mechanical film replacement process during the operation, the laparoscope lens can maintain a clear field of view for a long time, ensuring the laparoscope imaging quality. This mechanical membrane changing device is not only simple in structure, but also does not require the laparoscope lens to be removed from the body for cleaning, making it easier to operate. Moreover, compared with the existing electric membrane changing method, this mechanical membrane changing method does not require the installation of electronic components such as motors and control boards, so the production cost is lower. More importantly, the membrane changing process does not require a stable power supply, thus avoiding the impact of power supply fluctuations or failures of electronic components such as motors on the surgical process, which can improve the safety of the surgical process.

[0076] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A lens film replacement device for a cavity mirror, characterized in that: include: A shell (10), the shell (10) being connected to an inner sleeve (11) and an outer sleeve (12) sleeved on the outer periphery of the inner sleeve (11); the inner cavity of the inner sleeve (11) is capable of allowing a laparoscope to pass through, or the inner sleeve (11) is a part of the laparoscope, a membrane replacement channel is provided between the outer sleeve (12) and the inner sleeve (11), and the membrane replacement channel is communicated with the inner cavity of the shell (10); A film unwinding reel (20) and a film collecting reel (30) are installed in the inner cavity of the housing (10) and are both rotatable around their own axes; A lens film (40), one end of which is wound and connected to the film unwinding reel (20) and the other end of which is wound and connected to the film taking-up reel (30); the portion of the lens film (40) located outside the film unwinding reel (20) and the film taking-up reel (30) passes through the film changing channel and through the end opening of the inner sleeve (11); The mechanical driving member is directly or indirectly connected to the film winding reel (30) and is used to drive the film winding reel (30) to rotate in a positive direction around its own axis, so as to drive the lens film (40) to pass through the end opening of the inner sleeve (11) in sequence.

2. The lens film replacement device of the laparoscope according to claim 1, characterized in that: The film unwinding reel (20) is connected to a tensioning member (60) for driving the film unwinding reel (20) to rotate in the opposite direction so as to keep the lens film (40) in a tensioned state; a rotation limiting member is provided between the film winding reel (30) and the housing (10) for limiting the film winding reel (30) from rotating in the opposite direction so as to release the lens film (40).

3. The lens film replacement device of the laparoscope according to claim 2, characterized in that: The tensioning member (60) comprises a coil spring housing (61) fixed in the housing (10), and a coil spring (62) accommodated in the coil spring housing (61), wherein the central portion of the coil spring (62) is fixedly connected to the film unwinding reel (20).

4. The lens film replacement device of the laparoscope according to claim 2, characterized in that: The rotation limiting member comprises a ratchet (71) that rotates synchronously with the film-collecting reel (30), and a ratchet limiting structure arranged in the housing (10); the outer periphery of the ratchet (71) is provided with a plurality of circumferentially arranged ratchet teeth (711), and the ratchet limiting structure cooperates with the ratchet teeth (711) to limit the reverse rotation of the film-collecting reel (30).

5. The lens film replacement device of the laparoscope according to claim 4, characterized in that: The ratchet limiting structure is a ratchet pawl (1061) connected to the housing (10) and having one end extending toward the ratchet (71); or the inner wall of the housing (10) is provided with a receiving groove (102) for accommodating the ratchet (71), and the ratchet limiting structure is a plurality of inclined guide grooves (103) arranged on the groove wall of the receiving groove (102).

6. The lens film replacement device for a laparoscope according to any one of claims 1 to 5, characterized in that: The mechanical driving component comprises a knob (51) which is fixedly connected to the film winding reel (30) and has one end extending out of the housing (10).

7. The lens film replacement device for a laparoscope according to any one of claims 1 to 5, characterized in that: The film-rewinding reel (30) is fixedly connected to a gear (53) which rotates synchronously with the film-rewinding reel (30), and a slide groove (107) is provided in the shell (10); the mechanical driving component includes a rack (54) which is slidably connected to the slide groove (107) and meshes with the gear (53) for transmission, and a paddle (52) which is fixedly connected to the rack (54) and has one end extending out of the shell (10).

8. The lens film replacement device of the laparoscope according to claim 7, characterized in that: A baffle (108) located at one end of the slide groove (107) is provided in the housing (10), and an elastic member (55) in an elastically compressed state is provided between the rack (54) and the baffle (108).

9. The lens film replacement device of a laparoscope according to claim 1, characterized in that: The shell (10) is provided with a through hole (101) for the laparoscope to pass through; one end of the inner sleeve (11) extending into the shell (10) is arranged corresponding to the position of the through hole (101); the shell (10) is provided with an inner sleeve fixing member (13) for fixing the inner sleeve (11); the inner sleeve fixing member (13) comprises a sleeve ring (131) sleeved on the outer periphery of the inner sleeve (11); one side of the sleeve ring (131) is provided with an open groove; an elastic arm (132) is formed in the open groove, one end of which is fixedly connected to the sleeve ring (131) and the other end of which is suspended; a locking member (14) is threadedly connected to the shell (10), one end of which applies pressure to the elastic arm (132) and the other end of which extends out of the shell (10); the locking member (14) is used to drive the elastic arm (132) to bend into the sleeve ring (131) so as to lock the laparoscope in the sleeve ring (131).

10. The lens film replacement device of a laparoscope according to claim 1, characterized in that: The end of the inner sleeve (11) away from the shell (10) is detachably connected to an inner lens end cover (80) for providing support for the lens film (40); the end of the outer sleeve (12) away from the shell (10) is detachably connected to an outer lens end cover (90) sleeved on the outer periphery of the inner lens end cover (80).

Images