Traction device with protective film

Abstract

The utility model discloses a retractor with a protective film, which comprises a tubular part, an operation cavity for a surgical instrument to pass through is arranged in the tubular part, the size of the cross section of the operation cavity is adjustable, the wall surface defining the operation cavity comprises the protective film, and the size of the cross section of the operation cavity is adjusted by adjusting the proportion of the area occupied by the protective film in the wall surface of the operation cavity. According to the utility model, the section size of the operating cavity is adjustable by arranging the protective film, and the protective film occupies a small space of the tractor, so that the function and the compactness of the whole structure of the tractor are not influenced. The operation cavity is expanded outwards through the adjusting assembly, traction devices of different sizes do not need to be replaced in the operation, the operation cavity can be evenly expanded outwards through the adjusting assembly after puncture reaches the lesion position, and damage to human tissue is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a retractor with a protective film. Background Art

[0002] During the operation (including hypertensive intracerebral hemorrhage, hydrocephalus, intracranial aneurysm, pituitary tumor biopsy, etc.), after accurately determining the cell lesion target point through the navigation or imaging system, a brain spatula or a tubular brain tissue retractor is required for the operation to provide the best surgical field exposure for the doctor. However, the edge of the traditional brain spatula is sharp, and long-term traction and inconsistent force control may cause problems of brain injury due to excessive traction. The tubular tissue retractor can reach the lesion through the vertical surgical field with the shortest distance, minimize the traction on the brain tissue, and avoid passing through important structures at the same time. The tubular retractor can continuously and slowly expand the brain tissue in an arc to establish a surgical channel and provide surgical field exposure for the operation. When a larger surgical channel is required, a larger-sized tubular retractor needs to be used for puncture to form a larger surgical channel. However, during manual operation, the direction and magnitude of the applied force are not completely controllable and precise, which is likely to cause damage to human tissues, and the larger the surgical channel, the larger the damage range. Content of the Utility Model

[0003] Aiming at the above problems existing in the prior art, the purpose of the utility model is to provide a retractor with a protective film. By setting the protective film, the cross-sectional size of the operation cavity can be adjusted. The space of the retractor occupied by the protective film is very small, which does not affect the functions and compactness of the overall structure of the retractor. The operation cavity is expanded outward through the adjusting component. During the operation, it is not necessary to replace retractors of different sizes. After puncturing to reach the lesion position, the operation cavity can be evenly expanded outward through the adjusting component, reducing human tissue damage.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A retractor with a protective film includes a tubular part. An operation cavity for surgical instruments to pass through is arranged inside the tubular part. The cross-sectional size of the operation cavity is adjustable. The wall surface surrounding the operation cavity includes a protective film. The cross-sectional size of the operation cavity is adjusted by adjusting the area ratio of the protective film occupying the wall surface of the operation cavity.

[0006] As a further improvement of the above technical solution:

[0007] The protective film changes its area through its own elastic expansion and contraction to change the cross-sectional size of the operation cavity, or changes the cross-sectional size of the operation cavity by changing the overlapping area between the protective film and other parts of the wall surface of the operation cavity.

[0008] The area ratio of the protective film occupying the wall surface of the operation cavity is greater than or equal to 0.

[0009] The wall surface of the operation cavity includes a slide plate, a main board, and a protective film. The two ends of the protective film are respectively connected to the slide plate and the main board. The slide plate and the main board can move relative to each other, and the proportion of the protective film in the wall surface area of the operation cavity is changed by the relative movement of the slide plate and the main board.

[0010] The retractor further includes a buckle plate. The buckle plate and the slide plate can be spliced into a tubular structure. The main board is located in the tubular structure. The buckle plate and the main board are relatively fixed. There are two protective films. The main board, the protective films, and the buckle plate can be sequentially contacted and fitted. The two protective films are respectively connected to the two ends in the circumferential direction of the slide plate. One end of the protective film is connected to the slide plate, and the other end is slidably arranged in the gap between the main board and the buckle plate.

[0011] The protective film is elastic. There is one protective film. The protective film can be stretched and contracted. One end of the protective film is connected to one end of the slide plate, and the other end is connected to the other end of the slide plate after bypassing the convex side of the main board.

[0012] The material of the protective film is PC, PVC, PET, silicone, or rubber.

[0013] The retractor further includes an adjusting assembly. The adjusting assembly is connected to and transmits driving force to the slide plate and / or the main board, driving the slide plate and the main board to move away from or close to each other.

[0014] The retractor further includes a main board seat and a slide plate seat. The upper end of the main board is connected to the main board seat, and the lower end extends. The upper end of the slide plate is connected to the slide plate seat, and the lower end extends. The adjusting assembly is installed on the main board seat and the slide plate seat.

[0015] The adjusting assembly is a gear-rack transmission structure, a parallel sliding structure, or a screw transmission structure. The gear-rack transmission structure drives the relative movement of the main board seat and the slide plate seat through the meshing of the gear and the rack. The screw transmission structure drives the relative movement of the main board seat and the slide plate seat by rotating the bolt into different depths of the screw hole and self-locking. The parallel sliding structure realizes the relative movement and fixation of the main board seat and the slide plate seat by setting the main board seat and the slide plate seat as a structure meshing through teeth and tooth grooves.

[0016] The beneficial effects of the present utility model are as follows:

[0017] (1) By setting the protective film, the cross-sectional sizes of the inner cavity and the operation cavity of the retractor are adjustable. When the retractor is in the closed state, the proportion of the protective film in the wall surface of the operation cavity is zero, and the protective film can be attached to the main board. When the protective film is rigid, it can be set as an arc-shaped plate structure and can slide into the gap between the main board and the buckle plate. When the protective film is elastic, it can be wound around the outer surface of the main board. Whether it is rigid or elastic, the protective film in the present solution occupies a very small space of the retractor and does not affect the functions and compactness of the overall structure of the retractor.

[0018] (2) By adjusting the component to expand the operation cavity outwards, on the one hand, multiple size conversions can be achieved through one device, avoiding the need to replace tubular retractors of different sizes during the operation, that is, there is no need to replace the retractors of different sizes during the operation, saving costs and reducing the surgical operation steps; on the other hand, during the operation, puncture can be first performed when the retractor is in the closed state (i.e., the minimum cross-section of the operation cavity). At this time, the formed surgical channel is smaller, and then the expansion power is transmitted through the adjusting component to achieve uniform expansion of the operation cavity, that is, after puncturing to the lesion location, the operation cavity is uniformly expanded outwards through the adjusting component. Compared with directly using a retractor with a large cross-section for puncture, the puncture difficulty is reduced, and human tissue damage is reduced. For surgeries related to sensitive brain tissue, the probability of other complications and sequelae of the patient is greatly reduced.

[0019] (3) The same retractor is applicable to the requirements of different surgical channels and can be applied to intracranial minimally invasive surgeries, abdominal laparoscopic minimally invasive surgeries, renal pelvic tumor surgeries, lithotripsy minimally invasive surgeries, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model.

[0021] Figure 2 is a schematic structural diagram of the closed state of Embodiment 1 of the present utility model.

[0022] Figure 3 is Figure 2 an enlarged schematic diagram of part A of

[0023] Figure 4 is an exploded structural diagram of Embodiment 1 of the present utility model.

[0024] Figure 5 is a schematic structural diagram of another perspective of Embodiment 1 of the present utility model.

[0025] Figure 6 is Figure 5 an enlarged schematic diagram of part B of

[0026] Figure 7 is Figure 5 an assembled schematic diagram of part B of

[0027] Figure 8 is a schematic structural diagram of the open state of Embodiment 1 of the present utility model.

[0028] Figure 9 is a schematic structural diagram of the open state of Embodiment 2 of the present utility model.

[0029] Figure 10 is Figure 9 an enlarged schematic diagram of part D of

[0030] Figure 11It is a schematic structural diagram of the third embodiment of the present utility model.

[0031] Figure 12 It is an exploded structural diagram of the third embodiment of the present utility model. Detailed implementation manners

[0032] The following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present utility model, and are not used to limit the present utility model.

[0033] For the sake of convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0034] Embodiment 1

[0035] A retractor with a protective film, as Figure 1 shown, is used in cooperation with an expansion cannula. The expansion cannula is detachably passed through and installed on the retractor. The expansion cannula is used to puncture human tissues to form a surgical channel. After the surgical channel is formed, the expansion cannula is removed, and the retractor remains in the human tissues to maintain the surgical channel, and surgical instruments pass through the surgical channel to perform surgery.

[0036] The retractor, as Figure 1 and 4 shown, includes a tubular part 1, a main board 2, a pressing strip 3, an endoscope connector 4, an injection connector 5, a main board seat 8, a buckle seat 7, a slide board seat 6 and an adjustment assembly.

[0037] Three mutually independent and non - communicating channels are provided inside the tubular part 1, namely an endoscope cavity 11, an injection cavity 12 and an operation cavity 13, as Figure 2 and 3 shown. Among them, the sizes of the injection cavity 12 and the endoscope cavity 11 are fixed, that is, the cross - sectional areas and lengths of the injection cavity 12 and the endoscope cavity 11 are fixed. The length of the operation cavity 13 is unchanged and the size is adjustable.

[0038] The tubular part 1 is formed by a slide plate 14, a buckle plate 15 and a protective film 16. The main board 2, the buckle plate 15, the protective film 16 and the slide plate 14 are all curved panel structures. The buckle plate 15 and the slide plate 14 can be spliced into a tubular structure, and the splicing surface is parallel to the central axis direction of the tubular structure, that is, the length direction. Preferably, the cross-section of the tubular structure is an ellipse, and the cross-section is perpendicular to the length direction of the tubular structure. The buckle plate 15 and the slide plate 14 are symmetric with each other. The main board 2 and the protective film 16 are located in the inner cavity of the tubular structure formed by splicing the buckle plate 15 and the slide plate 14.

[0039] On the concave side of the main board 2, an endoscope cavity 11 and an injection cavity 12 are connected. As Figure 2 and 3 shown, the endoscope cavity 11 and the injection cavity 12 are formed by tubular components connected to the main board 2. The two through holes of the tubular components are respectively the endoscope cavity 11 and the injection cavity 12. The endoscope cavity 11 and the injection cavity 12 are not connected. The length directions of the endoscope cavity 11 and the injection cavity 12 are both parallel to the length direction of the main board 2. The endoscope cavity 11 is used for the endoscope to pass through. The injection cavity 12 is used for the injection medicine or cleaning water to pass through, so that the surgeon can inject physiological saline for cleaning to have a clean surgical field during the operation and clarify the bleeding point.

[0040] The endoscope cavity 11 and the injection cavity 12 can be set to a variety of different specifications. Preferably, the maximum diameter of the endoscope that can pass through the endoscope cavity 11 is set to 1 mm to 5 mm. The aperture of the injection cavity 12 is 0.1 mm to 5 mm. Different wide-angle functions or different maximum observation ranges of endoscopes can be used in the endoscope cavity 11. Preferably, the maximum observation range of the endoscope is 30° to 120°. With a wide observation range, the craniotomy range can be reduced, and excessive exposure of the surgical field can be avoided.

[0041] Based on the above structure, the retractor forms a three-chamber channel. The three channels are independent of each other, do not communicate with each other, and do not interfere with each other. The three channels are respectively the endoscope cavity 11, the injection cavity 12 and the operation cavity 13. The operation cavity 13 is a channel formed by the main board 2, the slide plate 14 and two protective films 16. The surgical instruments work independently in the operation cavity 13, avoiding interference between surgical instruments. The endoscope in the endoscope cavity 11 is installed in the independent endoscope cavity 11. The surgeon can operate the surgical instruments passing through the operation cavity 13 with both hands by himself, rather than operating with one hand or relying on an assistant to hold the mirror.

[0042] The size of the operation cavity 13 is adjustable. Specifically, the area of its cross-section is adjustable to meet the requirements of different sizes of surgical channels and adapt to the entry of surgical instruments of different sizes. The adjustability of the size of the operation cavity 13 is achieved by setting the protective film 16.

[0043] There are two protective films 16, and the main board 2, the protective film 16, and the buckle plate 15 can be successively contacted and adhered. Preferably, the main board 2, the protective film 16, and the buckle plate 15 are successively contacted and adhered to form a three-layer structure. The two protective films 16 are located in the same layer without overlapping. That is, the concave side of the protective film 16 is adhered to the convex side of the main board 2, and the convex side of the protective film 16 is adhered to the concave side of the buckle plate 15. In other words, the cross-section of the main board 2 is curved. This cross-section is perpendicular to the length direction of the main board 2, and the length of this curved shape is not greater than the length of the curved shape of the cross-section of the buckle plate 15.

[0044] The two protective films 16 are respectively connected to the two ends of the circumference of the sliding plate 14 through two pressure bars 3. One end of the circumference of the protective film 16 is connected to the sliding plate 14 through the pressure bar 3, and the other end is slidably arranged in the gap between the main board 2 and the buckle plate 15. The buckle plate 15 and the main board 2 are relatively fixed, and the sliding plate 14 and the main board 2 can move closer to or away from each other.

[0045] Specifically, the two pressure bars 3 are installed on the concave side of the sliding plate 14. Preferably, the two pressure bars 3 are respectively close to the two edges of the sliding plate 14. The length direction of the pressure bar 3 is parallel to the length direction of the sliding plate 14, and the two end portions of the length direction of the pressure bar 3 do not respectively exceed the two end portions of the length direction of the sliding plate 14. The two protective films 16 are respectively connected to the two pressure bars 3. Specifically, the length direction of the protective film 16 is parallel to the length direction of the pressure bar 3. A plurality of through holes are arranged at intervals along the length direction of the pressure bar 3, and the protective film 16 and the pressure bar 3 are connected together by fixing members passing through the through holes on the protective film 16 and the pressure bar 3.

[0046] The upper end of the main board 2 in the length direction is connected to the main board seat 8, and the lower end extends. The upper end of the buckle plate 15 is connected to the buckle plate seat 7, and the lower end extends. There are scales on the outer surface of the buckle plate 15 to mark its length. The upper end of the sliding plate 14 is connected to the sliding plate seat 6, and the lower end extends. The buckle plate seat 7 and the main board seat 8 can be connected together by snap-fastening, so that the main board 2 and the buckle plate 15 are relatively fixed. After connection, the curved surfaces of the main board 2 and the buckle plate 15 face the same direction. There is a gap between the main board 2 and the buckle plate 15 for accommodating the protective film 16, and the protective film 16 can slide in this gap. There is an injection joint 5 and an endoscope joint 4 on the main board seat 8. The injection joint 5 is communicated with the injection cavity 12, and the operator can inject medicine or cleaning water into the injection cavity 12 through the injection joint 5. The endoscope joint 4 is used to connect the endoscope in the endoscope cavity 11 with external equipment.

[0047] The adjustment component is manually operated, and the adjustment component drives the slide plate 14 and the main board 2 to move relative to each other, so that the slide plate 14 moves in a direction close to or away from the main board 2. The slide plate 14 and the main board 2 can be close to each other until the two ends of the slide plate 14 in the circumference are in contact with the two ends of the buckle plate 15 in the circumference, respectively. At this time, the tubular portion 1 is surrounded by the slide plate 14 and the buckle plate 15, and the wall surface of the operating cavity 13 is surrounded by the slide plate 14 and the main board 2. It is assumed that this is a closed state. The slide plate 14 and the main board 2 can be moved away from each other until the protective film 16 is at least partially pulled out of the gap between the main board 2 and the buckle plate 15. At this time, one end of the slide plate 14 in the circumference, one protective film 16, the main board 2, another protective film 16, and the other end of the slide plate 14 in the circumference are connected in sequence and surround the wall surface of the operating cavity 13. It is assumed that this is an open state. Figure 8 As shown. Obviously, in the closed state, the cross-sectional size of the operating cavity 13 is fixed and unique; in the open state, the cross-sectional size of the operating cavity 13 may be different, depending on the specific position of the protective film 16. The protective film 16 cannot completely detach from the gap between the main board 2 and the buckle plate 15, that is, in the open state, the cross-sectional size of the operating cavity 13 has a maximum value. The protective film 16 can be prevented from detaching from the gap between the main board 2 and the buckle plate 15 by limiting the moving range between the slide seat 6 and the main board seat 8 through a mechanical limiter. In the open state, the protective film 16 can prevent human tissue (such as brain tissue) at the surgical site from entering the operating cavity 13.

[0048] The protective film 16 is made of materials such as PC, PVC, PET, silica gel or rubber, and has a certain strength.

[0049] In this embodiment, the adjustment component is a gear rack transmission structure, such as Figures 4 - 7As shown, the rack and pinion transmission structure includes a transmission handle 91, an O-ring 92, a transmission cover 93, a rack 94, and a pinion 95. The rack 94 is fixedly installed on the slide plate seat 6, and the length direction of the rack 94 is perpendicular to the length direction of the slide plate 14. The pinion 95 is rotatably installed on the main board seat 8, and the rack 94 meshes with the pinion 95. The pinion 95 and the transmission handle 91 are coaxially connected by a connecting shaft 96. When a person rotates the transmission handle 91, the transmission handle 91 drives the pinion 95 to rotate synchronously. The pinion 95 drives the rack 94 engaged with it to move along the length direction of the rack 94. The rack 94 drives the slide plate seat 6 to move synchronously, so that the slide plate 14 and the main board 2 move relatively closer or farther away. Thus, the rotational motion of the transmission handle 91 is converted into the linear motion of the slide plate 14. Further, the transmission cover 93 is arranged on the main board seat 8 and covers the outside of the pinion 95 to protect the pinion 95. The O-ring 92 is located between the transmission cover 93 and the connecting shaft 96. The transmission cover 93 pre-presses the O-ring 92 and is assembled onto the main board seat 8 to generate a large frictional force, so that the slide plate 14 and the main board 2 achieve damping positioning. That is, due to the damping effect of the O-ring 92, the relative movement of the slide plate 14 and the main board 2 can only be realized under the action of a certain external force, preventing the relative movement of the slide plate 14 and the main board 2 caused by accidental touch.

[0050] In this embodiment, the maximum distance that the slide plate 14 can move relative to the main board 2 is 5 mm to 30 mm. Further, the transmission handle 91 is provided with scales to mark the state of the retractor at this time, so as to indirectly know the size of the cross-section of the operation cavity 13.

[0051] In this embodiment, the slide plate 14, the buckle plate 15, the protective film 16, and the main board 2 are equal in length, and their two ends are flush with each other. Multiple buckle plates 15 with different length specifications can be set. Preferably, the length of the buckle plate 15 can be set to 30 mm to 90 mm.

[0052] As can be seen from the above, in this solution, the cross-sectional size of the operation cavity 13 is adjustable, and the operation cavity 13 is expanded outward or reduced inward through the adjustment assembly. Since the original driving force of the human hand is transmitted through the adjustment assembly, the adjustment assembly finally converts the original driving force of the human hand into the relative linear movement of the main board 2 and the slide plate 14. The moving direction is perpendicular to the length directions of the main board 2 and the slide plate 14. This moving direction is determined and is not affected by the direction and magnitude of the human hand force. Therefore, when the operation cavity 13 expands outward, it can expand evenly outward, that is, the main board 2 and the slide plate 14 move smoothly in a straight line, and the moving direction is always perpendicular to the length directions of the main board 2 and the slide plate 14.

[0053] The above-mentioned feature of the adjustable cross-section of the operation cavity 13 has two advantages: on the one hand, multiple size conversions can be achieved through one device, avoiding the need to replace tubular retractors of different sizes during the operation, that is, there is no need to replace the retractors of different sizes during the operation. Specifically, it is not necessary to pull out the retractor inserted into the human body and re-insert a larger-sized retractor. Only by adjusting the cross-sectional size of the operation cavity 13 through the adjustment assembly can it be achieved. On the other hand, during the operation, puncture can be performed first when the retractor is in the closed state (i.e., the minimum cross-section of the operation cavity 13). At this time, the formed surgical channel is relatively small, and then the cross-section of the operation cavity 13 can be enlarged through the adjustment assembly, that is, after puncturing to reach the lesion location, the operation cavity 13 can be uniformly expanded outwards through the adjustment assembly. Since the main board 2 and the sliding board 14 move smoothly relative to each other, the operation cavity 13 can be uniformly expanded when it expands outwards. Compared with directly puncturing with a large-sized retractor to directly obtain a large surgical channel, this reduces the damage to human tissues. For brain tissue-related surgeries, this greatly reduces the probability of sequelae, other complications, and injuries to patients. If directly puncturing with a large-sized retractor, since the direction and magnitude of the human hand force are not completely controllable, it is easier to damage the brain tissue.

[0054] Embodiment 2

[0055] Different from Embodiment 1, the adjustment assembly in this embodiment is a parallel sliding structure. As Figure 9 and 10 shown, a groove is provided on the main board seat 8, and a row of tooth grooves 94' are provided on each of the two opposite side walls in the groove. Two clamping blocks 92' are provided on the sliding board seat 6. The two clamping blocks 92' are located in the same plane, and there is a gap between the two clamping blocks 92'. One end of the clamping block 92' is connected to the sliding board seat 6, and the other end extends. The connection between the clamping block 92' and the sliding board seat 6 allows a certain elastic deformation, so that the two clamping blocks 92' can move relative to each other within a certain range. A handle 93' is connected to the extending end of the clamping block 92'. At least one tooth 91' is provided on each of the two clamping blocks 92', and the tooth 91' on each clamping block 92' is arranged on the side away from the other clamping block 92'. The two clamping blocks 92' can be inserted into the groove on the main board seat 8, and the teeth 91' on the two clamping blocks 92' can be respectively engaged with the two rows of tooth grooves 94' on the main board seat 8, that is, the tooth 91' on the clamping block 92' is inserted into one tooth groove 94' on the main board seat 8. When pulling or pushing the handle 93', the two clamping blocks 92' are driven to move step by step relative to the main board seat 8. During the movement, the tooth 91' on the clamping block 92' can be successively inserted into each tooth groove 94' on the main board seat 8 and fixed here without external force. The clamping block 92' drives the sliding board 14 to move synchronously, realizing the relative movement between the sliding board 14 and the main board 2.

[0056] Preferably, scales can be marked on the main board seat 8 to read the relative position of the sliding board 14 and the main board 2 at this time, and indirectly obtain the cross-sectional size of the operation cavity 13 at this time.

[0057] As described above, by pulling the handle 93' of the sliding plate seat 6, the teeth 91' on the clamping block 92' engage with different slots on the main board seat 8 to achieve the opening and closing action, thereby achieving the purpose of adjusting the opening and closing size.

[0058] Embodiment Three

[0059] Different from Embodiment One, the adjusting component in this embodiment is a screw drive structure. As Figure 11 and 12 shown, a threaded hole is provided on the main board seat 8, and a screw rod 91'' is rotatably installed on the sliding plate seat 6. The screw rod 91'' is limited on the sliding plate seat 6 by a fixing cover 93'', and the screw rod 91'' is coaxially connected to the adjusting handle 92''. The screw rod 91'' can be screwed onto the threaded hole and self-lock. When the adjusting handle 92'' is rotated, the screw rod 91'' moves along the length direction of the threaded hole, driving the sliding plate 14 and the main board 2 to move relative to each other. The operation cavity 13 can be adjusted to any size within the design range and self-locked and fixed by the adjusting handle 92''.

[0060] Embodiment Four

[0061] Different from Embodiments One, Two, and Three, in this embodiment, there is one protective film 16 instead of two. The protective film 16 is elastic and can be stretched and contracted.

[0062] In this embodiment, the protective film 16 is made of silicone, rubber, etc.

[0063] In this embodiment, one end of the protective film 16 is connected to a pressing strip 3, and the other end is connected to another pressing strip 3 after bypassing the gap between the main board 2 and the buckling plate 15. Alternatively, one end of the protective film 16 is connected to a pressing strip 3, and the other end is connected to another pressing strip 3 after bypassing the outer surface of the buckling plate 15.

[0064] In this embodiment, when the operation adjusting component moves the sliding plate 14 away from the main board 2, the protective film 16 is stretched due to its own elasticity, realizing the adjustable cross-sectional size of the operation cavity 13.

[0065] Finally, it is necessary to state here that the above embodiments are only used to further illustrate the technical solutions of the present invention in detail, and cannot be understood as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention.

Claims

1. A retractor with a protective film, characterized in that: The invention comprises a tubular portion (1), wherein an operating cavity (13) is arranged in the tubular portion (1) for a surgical instrument to pass through, the cross-sectional size of the operating cavity (13) is adjustable, and the wall surface surrounding the operating cavity (13) comprises a protective film (16), and the cross-sectional size of the operating cavity (13) is adjusted by adjusting the area ratio occupied by the protective film (16) in the wall surface of the operating cavity (13).

2. The retractor according to claim 1, characterized in that: The protective film (16) changes its area through its own elastic expansion and contraction, thereby changing the cross-sectional size of the operating chamber (13), or changes the cross-sectional size of the operating chamber (13) by changing the overlapping area of ​​the protective film (16) and other parts of the wall surface of the operating chamber (13).

3. The retractor according to claim 1 or 2, characterized in that: The area ratio occupied by the protective film (16) in the wall surface of the operating chamber (13) is greater than or equal to 0.

4. The retractor according to claim 3, characterized in that: The wall surface of the operating chamber (13) comprises a slide plate (14), a main board (2) and a protective film (16); two ends of the protective film (16) are respectively connected to the slide plate (14) and the main board (2); the slide plate (14) and the main board (2) are relatively movable; and the proportion of the protective film (16) in the wall surface area of ​​the operating chamber (13) is changed by the relative movement of the slide plate (14) and the main board (2).

5. The retractor according to claim 4, characterized in that: The retractor also includes a gusset plate (15), which can be spliced ​​with the slide plate (14) to form a tubular structure. The main board (2) is located in the tubular structure. The gusset plate (15) and the main board (2) are relatively fixed. Two protective films (16) are provided. The main board (2), the protective film (16) and the gusset plate (15) can contact and fit in sequence. The two protective films (16) are respectively connected to the two ends of the slide plate (14) in the circumferential direction. One end of the protective film (16) is connected to the slide plate (14), and the other end is slidably arranged in the gap between the main board (2) and the gusset plate (15).

6. The retractor according to claim 4, characterized in that: The protective film (16) is elastic and has one sheet. The protective film (16) can be stretched and shrunk. One end of the protective film (16) is connected to one end of the slide plate (14), and the other end of the protective film (16) is connected to the other end of the slide plate (14) after passing around one side of the convex surface of the main board (2).

7. The retractor according to any one of claims 4 to 6, characterized in that: The material of the protective film (16) is PC, PVC, PET, silica gel or rubber.

8. The retractor according to claim 4, characterized in that: The retractor further comprises an adjusting component, which is connected to and transmits a drive to the slide plate (14) and / or the main plate (2), driving the slide plate (14) and the main plate (2) to move away from or closer to each other.

9. The retractor according to claim 8, characterized in that: The retractor also includes a main board seat (8) and a slide board seat (6); the upper end of the main board (2) is connected to the main board seat (8) and the lower end is cantilevered; the upper end of the slide board (14) is connected to the slide board seat (6) and the lower end is cantilevered; the adjustment component is installed on the main board seat (8) and the slide board seat (6).

10. The retractor according to claim 9, characterized in that: The adjustment assembly is a gear rack transmission structure or a parallel sliding structure or a threaded transmission structure. The gear rack transmission structure drives the main plate seat (8) and the slide plate seat (6) to move relative to each other through the meshing of the gear and the rack. The threaded transmission structure drives the main plate seat (8) and the slide plate seat (6) to move relative to each other through the self-locking by rotating the bolt into the screw hole to different depths. The parallel sliding structure realizes the relative movement and fixation of the main plate seat (8) and the slide plate seat (6) by setting the main plate seat (8) and the slide plate seat (6) to a structure in which teeth and tooth grooves mesh.

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