A sternal retractor for internal mammary artery sampling

Abstract

This invention relates to a sternal retractor for internal mammary artery sampling, comprising two paddles for retracting the sternum and an adjustable clamping mechanism. The clamping mechanism includes an expansion mechanism for fixing the expansion mechanism in a suitable position on the operating table. The two paddles are mounted on the expansion mechanism, which retracts the sternum by driving the two paddles apart. The expansion mechanism also includes an upward lifting mechanism, which simultaneously pulls the two paddles upward during the retraction process. This sternal retractor for internal mammary artery sampling achieves horizontal retraction of the sternum while simultaneously lifting it upward using the paddles, effectively increasing the wound size and maneuverability within the wound. This helps achieve better retraction with less force applied horizontally to the sternum, reducing the risk of sternal damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of open chest surgery auxiliary devices, in particular to a breast internal artery material taking sternal spreader. BACKGROUND

[0002] At present, in the breast internal artery material taking operation, the teeth are usually used to drive two prongs to spread the sternum horizontally. In order to obtain a larger operation window, the horizontal pushing force is exerted on the sternum as much as possible, so that the sternum is subjected to a large force and has a risk of breaking. In addition, the space is limited, and the operator needs to bend down to take the material, which increases the operation difficulty. In view of this, the breast internal artery material taking sternal spreader is provided. SUMMARY

[0003] The present application aims to provide a breast internal artery material taking sternal spreader to solve the problems in the background. To achieve the above purpose, the present application provides the following technical scheme: a breast internal artery material taking sternal spreader, comprising two prongs for spreading the sternum, and an adjustable clamping mechanism, the clamping mechanism is provided with an expansion mechanism, the clamping mechanism is used to fix the expansion mechanism at a suitable position on the operating table, the two prongs are arranged on the expansion mechanism, the expansion mechanism drives the two prongs away from each other to spread the sternum, the expansion mechanism is provided with a lifting mechanism, and the expansion mechanism drives the two prongs to lift up during the process of driving the two prongs away from each other.

[0004] Preferably, the expansion mechanism comprises an adjusting plate, the middle part of the adjusting plate is fixed with a shaft rod one, two strip-shaped through holes are symmetrically arranged on both sides of the shaft rod one, the two strip-shaped through holes are arranged on the adjusting plate, and the directions of the two strip-shaped through holes are on the same straight line, the shaft rod one is pivotally connected at the midpoint position of the rocker, the two ends of the rocker are both hingedly connected with sliding blocks through connecting rods one, and the two sliding blocks are slidingly connected in the two strip-shaped through holes.

[0005] Preferably, the adjusting plate is fixed with a shaft support, the shaft support is pivotally connected with a screw rod, one end of the screw rod is fixed with a turntable, a screw sleeve is sleeved and threadedly connected on the screw rod, the screw sleeve is fixedly connected with one of the sliding blocks through a connecting rod two, and the end of the screw rod away from the turntable is in transmission connection with the clamping mechanism.

[0006] Preferably, the sliding block is fixed with a cantilever, the two cantilevers are arranged in parallel, the cantilever is perpendicular to the adjusting plate, a sliding sleeve is fixed on the side wall of the opposite side of each cantilever, a rack two is inserted in the sliding sleeve, the upper end of each prong is fixedly connected with the lower end of each rack two, the lower end of the prong is arc-shaped, and the two prongs are arranged in an eight-character shape.

[0007] Preferably, the upper lifting mechanism comprises a shaft rod two fixedly connected in rotation on the cantilever, the shaft rod two is arranged in parallel with the cantilever, and the two rack twos are located on the outer sides of the two shaft rod twos, the shaft rod two is coaxially fixedly connected with a gear two, and the gear two is in meshing connection with the corresponding rack two.

[0008] Preferably, the adjusting plate is fixed with a rack one on the side away from the rocker, and the rack one is arranged in parallel with the trend of the strip-shaped through hole, the shaft rod two is coaxially fixedly connected with a gear one, and the gear one is in meshing connection with the teeth of the bottom surface of the rack one.

[0009] Preferably, the clamping mechanism comprises two clamping jaws, and the clamping jaws are in the shape of U with the opening downward, the middle part of the clamping jaw is hingedly connected with an extension rod, and the two ends of the adjusting plate are fixedly connected with the upper ends of the two extension rods through the connecting rods.

[0010] Preferably, the inner side of the clamping jaw is provided with a groove, a pin shaft is fixed in the groove, a semicircular plate is fixedly connected in rotation on the pin shaft, the circular arc contour of the semicircular plate faces the middle part of the clamping jaw, the position where the pin shaft is connected with the semicircular plate is away from the center of the semicircular plate and close to the lower end of the semicircular plate, the upper end of the semicircular plate is hingedly connected with the inner side wall of the groove through a rubber air bag, a top rod is slidably connected through the side wall of the clamping jaw, one end of the top rod in the groove can be in contact with the lower end of the semicircular plate, and the other end of the top rod outside the clamping jaw is connected with the clamping jaw through a spring.

[0011] Preferably, a cavity is formed in the clamping jaw, a pressure relief valve is fixed on the clamping jaw and communicates with the cavity, a channel is formed in the clamping jaw, one end of the channel communicates with the cavity, and the other end of the channel communicates with the rubber air bag through the air pipe two.

[0012] Preferably, a pump cylinder is fixed on the adjusting plate, a reciprocating screw rod is fixedly connected in rotation in the pump cylinder, the reciprocating screw rod is coaxially fixedly connected with a screw rod, a piston plate is slidably connected in the pump cylinder, the reciprocating screw rod is slidably connected on the piston plate, a slide rod parallel to the reciprocating screw rod is fixed in the pump cylinder, and the slide rod is slidably connected on the piston plate.

[0013] Preferably, one-way valves one and two are fixedly connected and communicated at the two ends of the pump cylinder, the one-way valve one communicates with the cavity through the air pipe one, the one-way valve one is directed to the cavity in the direction of conduction, and the one-way valve two is directed to the inside of the pump cylinder in the direction of conduction.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] The whole sternum spreader is fixed on the operating table at a suitable position through the clamping mechanism, and the sternum is spread by driving the two prongs away from each other through the expansion mechanism, and at the same time, the expansion mechanism drives the two prongs upward through the lifting mechanism, so that the sternum is lifted upward by the prongs while being spread in the horizontal direction, thereby effectively increasing the incision and increasing the space for operation inside the incision, which helps to achieve better spreading effect with less force in the horizontal direction of the sternum, reduces the risk of damage to the sternum, and the clamping mechanism is arranged to avoid the need for additional personnel to maintain the stability of the sternum in the spread state, saving time and effort and reducing the operation difficulty.

[0016] In the application, the expansion mechanism drives the clamping mechanism to be more firmly connected with the operating table during the movement of the two prongs, ensuring that the adjustment plate remains stable when the expansion mechanism adjusts the two prongs, avoiding damage to the sternum of the patient, and facilitating installation and disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a general assembly sectional structure schematic diagram of the application;

[0018] Figure 2 It is a rear view of the adjustment plate structure in Figure 1

[0019] Figure 3 It is an enlarged structure schematic diagram of A in Figure 2

[0020] Figure 4 It is a claw sectional structure schematic diagram in the application.

[0021] In the figure: 1, claw; 2, telescopic rod; 3, adjustment plate; 4, connecting rod one; 5, strip-shaped through hole; 6, rocker; 7, sliding block; 8, lap bar; 9, one-way valve one; 10, one-way valve two; 11, air pipe one; 12, pump cylinder; 13, reciprocating screw; 14, piston plate; 15, sliding rod; 16, screw; 17, screw sleeve; 18, shaft support; 19, turntable; 20, connecting rod two; 21, prong; 22, shaft rod one; 23, rack one; 24, gear two; 25, shaft rod two; 26, cantilever; 27, sliding sleeve; 28, rack two; 29, gear one; 30, cavity; 31, pressure relief valve; 32, channel; 33, air pipe two; 34, rubber air bag; 35, semicircular plate; 36, pin shaft; 37, spring; 38, jacking rod; 39, groove. DETAILED DESCRIPTION

[0022] ​​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0023] Please refer to Figures 1 to 4 The present application provides a technical solution:

[0024] Embodiment 1

[0025] The thoracic sternal dilator for taking internal mammary artery includes two prongs 21 for dilating the sternum, and an adjustable clamping mechanism, the clamping mechanism is provided with a dilating mechanism, the clamping mechanism is used for fixing the dilating mechanism at a suitable position on the operating table, the two prongs 21 are arranged on the dilating mechanism, the dilating mechanism drives the two prongs 21 away from each other to dilate the sternum, the dilating mechanism is provided with a lifting mechanism, and the dilating mechanism drives the two prongs 21 to be lifted up simultaneously through the lifting mechanism in the process of driving the two prongs 21 away from each other.

[0026] Embodiment 2

[0027] The embodiment is realized on the basis of embodiment 1, wherein the dilating mechanism includes an adjusting plate 3, the middle part of the adjusting plate 3 is fixed with a shaft rod one 22, two strip-shaped through holes 5 are symmetrically arranged on the two sides of the shaft rod one 22, the two strip-shaped through holes 5 are arranged on the adjusting plate 3, and the directions of the two strip-shaped through holes 5 are on the same straight line, the shaft rod one 22 is fixedly connected with the midpoint of a rocker 6, the two ends of the rocker 6 are both hingedly connected with a sliding block 7 through a connecting rod one 4, the two connecting rod ones 4 are arranged in parallel with each other, the two sliding blocks 7 are respectively slidably connected in the two strip-shaped through holes 5, the adjusting plate 3 is fixed with a shaft support 18, the shaft support 18 is fixedly connected with a screw rod 16 in rotation, one end of the screw rod 16 is fixed with a rotating disc 19, the screw rod 16 is sleeved and threadedly connected with a screw sleeve 17, the screw sleeve 17 is fixedly connected with one of the sliding blocks 7 through a connecting rod two 20, and the end, away from the rotating disc 19, of the screw rod 16 is in transmission connection with the clamping mechanism.

[0028] In the embodiment, the sliding block 7 is fixed with a cantilever 26, the two cantilevers 26 are arranged in parallel with each other, the cantilever 26 is perpendicular to the adjusting plate 3, a slide sleeve 27 is fixed on the side wall of the opposite side of each of the two cantilevers 26, a rack two 28 is inserted into the slide sleeve 27, the upper end of each of the two prongs 21 is fixedly connected with the lower end of each of the two rack twos 28, the lower end of the prong 21 is in arc shape, and the two prongs 21 are arranged in eight-character shape in symmetry.

[0029] In the embodiment, the lifting mechanism comprises shaft rods two 25 fixedly connected to the cantilever 26 in a pivotable manner, the shaft rods two 25 are arranged in parallel with the cantilever 26, and the two racks two 28 are located outside the two shaft rods two 25; the shaft rods two 25 are coaxially fixedly connected with the gears two 24, the gears two 24 are in meshing connection with the corresponding racks two 28; the side, away from the rocker 6, of the adjusting plate 3 is fixedly connected with the rack one 23, and the rack one 23 is arranged in parallel with the direction of the strip-shaped through hole 5; the shaft rods two 25 are coaxially fixedly connected with the gears one 29, and the gears one 29 are in meshing connection with the teeth on the bottom surface of the rack one 23.

[0030] In the embodiment, the clamping mechanism comprises two clamping jaws 1, and the clamping jaws 1 are in the shape of U with the opening downward; the middle parts of the clamping jaws 1 are hingedly connected with telescopic rods 2, the telescopic rods 2 are provided with locking structures so as to adjust the length of the telescopic rods 2, and the two ends of the adjusting plate 3 are fixedly connected with the upper ends of the two telescopic rods 2 through the connecting rods 8; the inner side surfaces of the clamping jaws 1 are provided with grooves 39, the grooves 39 are fixedly connected with pin shafts 36, the pin shafts 36 are pivotally connected with semicircular plates 35, the arc contour of the semicircular plates 35 faces the middle parts of the clamping jaws 1, the positions, at which the pin shafts 36 are connected with the semicircular plates 35, are away from the centers of the semicircular plates 35 and close to the lower ends of the semicircular plates 35, the upper ends of the semicircular plates 35 and the inner side walls of the grooves 39 are hingedly connected through rubber air bags 34, the side walls of the clamping jaws 1 are penetrated and slidably connected with jacks 38, and the ends of the jacks 38 located in the grooves 39 can be in contact with the lower ends of the semicircular plates 35, and the ends of the jacks 38 located outside the clamping jaws 1 are connected with the clamping jaws 1 through springs 37.

[0031] In the embodiment, the clamping jaws 1 are provided with cavities 30, the clamping jaws 1 are fixedly connected with pressure relief valves 31 communicated with the cavities 30, the clamping jaws 1 are provided with passages 32, one end of the passages 32 is communicated with the cavities 30, and the other end of the passages 32 is communicated with the rubber air bags 34 through air tubes two 33; the adjusting plate 3 is fixedly connected with pump barrels 12, the pump barrels 12 are pivotally connected with reciprocating lead screws 13, the reciprocating lead screws 13 are coaxially fixedly connected with screw rods 16, the pump barrels 12 are slidably connected with piston plates 14, the reciprocating lead screws 13 are penetrated and slidably connected with the piston plates 14, the pump barrels 12 are fixedly connected with slide rods 15 parallel with the reciprocating lead screws 13, the slide rods 15 are penetrated and slidably connected with the piston plates 14, the two ends of the pump barrels 12 are fixedly connected with one-way valves one 9 and one-way valves two 10, the one-way valves one 9 are communicated with the cavities 30 through air tubes one 11, the one-way valves one 9 are directed to the cavities 30, and the one-way valves two 10 are directed to the interiors of the pump barrels 12.

[0032] The working principle and advantages of the breastbone spreader for internal mammary artery are as follows:

[0033] For example, Figure 1 and Figure 4As shown, the chuck 1 is fitted into the appropriate position on the frame at the edge of the operating table. During the fitting process, the force applied by the frame to the semicircular plate 35 causes the semicircular plate 35 to rotate around the pin 36. Figure 4 The counterclockwise rotation causes the semicircular plate 35 to tend to move away from the frame, thus preventing the clasp 1 from smoothly engaging with the frame and facilitating the installation of the entire sternal retractor. After the clasp 1 is installed, if the clasp 1 moves upward, the friction between the semicircular plate 35 and the frame will cause the semicircular plate 35 to rotate clockwise, thereby causing the friction between the semicircular plate 35 and the frame to move downward and increase sharply, preventing the clasp 1 from moving upward and preventing the clasp 1 from accidentally disengaging from the frame, thus ensuring the stability and reliability of the surgical procedure.

[0034] After installing the claw 1, adjust the height of the telescopic rod 2 so that the pry bar 21 is adapted to the position of the wound, so as to open the sternum later.

[0035] After completing the above operations, the screw 16 is rotated by hand-held turntable 19, causing the screw 16 to drive the screw sleeve 17 closer to the shaft bracket 18 via threaded transmission. This causes the screw sleeve 17 to drive the corresponding slider 7 through connecting rod 20 to move towards the end of the corresponding adjusting plate 3 within the strip-shaped through hole 5. Furthermore, the slider 7 increases the angle between connecting rod 4 and rocker arm 6, causing the two sliders 7 to move away from each other in the horizontal direction. Figure 2 As shown, the synchronous movement of the two sliders 7 drives the two cantilever arms 26 to move away from each other, thereby causing the two cantilever sleeves 27 and the rack 28 to drive the two paddles 21 to move away from each other, thus opening the sternum in the horizontal direction.

[0036] As described above, while the two cantilever arms 26 move away from each other, the two shafts 25 rotate synchronously in opposite directions under the action of the rack 23 and the two gears 29. Figure 3 As shown, the gear 24 and rack 28 drive the corresponding lever 21 to move upward, thereby opening the sternum horizontally while simultaneously lifting it upward with the lever 21. This effectively enlarges the wound and increases the maneuverability within the wound, helping to achieve a better opening effect with less force applied to the sternum horizontally, reducing the risk of damage to the sternum. Moreover, the clamping mechanism eliminates the need for additional personnel to maintain the stability of the sternum in the opened state, saving time and effort and reducing the difficulty of operation.

[0037] like Figure 1 and Figure 2As shown, the adjusting plate 3 is provided with an illumination beam, the illumination beam is electrically connected with a power supply and connected with the adjusting plate 3 through a serpentine universal joint, so that the illumination beam can provide illumination to the opened window, and the space is increased while the light is irradiated, the operator does not need to change the body position to obtain the artery, the labor intensity is reduced, and the practicability is improved.

[0038] After the operation is completed, the screw rod 16 is reversely rotated through the hand-held turntable 19, so that the screw rod 16 drives the screw sleeve 17 to move away from the shaft support 18 through the threaded transmission, so that the included angle between the connecting rod 4 and the rocker 6 is reduced, and then the two sliding blocks 7 are close to each other in the horizontal direction, as shown in Figure 2 As shown, the movement of the two sliding blocks 7 synchronously drives the two cantilever arms 26 to be close to each other, so that the two suspension arm barrels 27 and the rack 28 drive the two toggle plates 21 to be close to each other and reset, and the two shaft rods 25 are synchronously rotated in opposite directions under the cooperation of the rack 23 and the two gear wheels 29, as shown in Figure 3 As shown, so as to drive the corresponding toggle plate 21 to move downward and reset through the gear wheel 24 and the rack 28, and the sternum is released, which is simple and convenient to operate.

[0039] As described above, the screw rod 16 is reversely rotated, so that the reciprocating screw rod 13 is rotated, and the piston plate 14 is reciprocally moved in the pump barrel 12, so that the piston plate 14 alternately applies compression force and suction force to the spaces on both sides. Since the conduction direction of the one-way valve 9 points to the container cavity 30, and the conduction direction of the one-way valve 10 points to the inside of the pump barrel 12, when the pump barrel 12 is subjected to suction force, air is sucked into the pump barrel 12 through the one-way valve 10, and when the pump barrel 12 is subjected to compression force, air in the pump barrel 12 is transported into the container cavity 30 through the trachea 11, and then the air is transported into the rubber air bag 34 through the channel 32 and the trachea 33, so that the rubber air bag 34 is inflated and applies a pushing force to the upper end of the semicircular plate 35, so that the clamping jaw 1 is more tightly connected with the frame, so that the adjusting plate 3 is kept stable when the expansion mechanism adjusts the two toggle plates 21, so as to avoid damage to the sternum of the patient, and when the air pressure in the container cavity 30 increases to a certain value, the pressure is released through the pressure relief valve 31.

[0040] When the clamping jaw 1 is removed, the top rod 38 is pressed, so that the top rod 38 compresses the spring 37, so that the spring 37 obtains a restoring force. When the top rod 38 is pressed, the top rod 38 applies a pushing force to the lower end of the semicircular plate 35, so that the semicircular plate 35 is counterclockwise rotated in Figure 4 , and the rubber air bag 34 is compressed while being away from the frame, so as to facilitate the removal of the clamping jaw 1 from the frame, which is simple and convenient to operate, and the top rod 38 is reset under the restoring force of the spring 37.

[0041] It should be apparent to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments and that the present application can be carried out in other embodiments by appropriately adapting the teachings of the present application. The foregoing description, therefore, is by way of example only, and the scope of the present application is limited solely by the claims following herein. It is specifically intended that all such changes and modifications that come within the spirit of the present application are covered by the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0042] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A sternal retractor for use in harvesting the internal mammary artery, comprising two blades (21) for retracting the sternum, characterized in that: Also include adjustable clamping mechanism, the clamping mechanism is provided with expansion mechanism, the clamping mechanism is used to fix the expansion mechanism in the appropriate position on the operating table, two the said paddle (21) is provided on the expansion mechanism, the expansion mechanism is driven by two the said paddle (21) away from each other so that the sternal distraction, the expansion mechanism is provided with lifting mechanism, and the expansion mechanism is driven by lifting mechanism two the said paddle (21) is pulled up in the process of driving two the said paddle (21) away from each other; The expansion mechanism includes an adjusting plate (3), the middle part of the adjusting plate (3) is fixed with a shaft rod one (22), the both sides of the shaft rod one (22) are symmetrically provided with two strip-shaped through holes (5), two strip-shaped through holes (5) are opened on the adjusting plate (3), and the directions of two strip-shaped through holes (5) are on the same straight line, the shaft rod one (22) is pivotally connected at the midpoint of the rocker (6), both ends of the rocker (6) are hingedly connected with sliding blocks (7) through connecting rods one (4), two sliding blocks (7) are slidingly connected in two strip-shaped through holes (5) respectively, the adjusting plate (3) is fixed with a shaft support (18), the shaft support (18) is pivotally connected with a screw rod (16), one end of the screw rod (16) is fixed with a turntable (19), the screw rod (16) is sleeved and threadedly connected with a screw sleeve (17), the screw sleeve (17) is fixedly connected with one of the sliding blocks (7) through a connecting rod two (20), one end of the screw rod (16) away from the turntable (19) is in transmission connection with the clamping mechanism, the sliding block (7) is fixed with cantilever arms (26), and two cantilever arms (26) are parallel to each other, the cantilever arms (26) are perpendicular to the adjusting plate (3), the sliding sleeves (27) are fixed on the side walls of the opposite sides of the cantilever arms (26), and the sliding sleeves (27) are inserted with rack twos (28), the upper ends of two paddle (21) are fixedly connected at the lower ends of two rack twos (28) respectively, the lower end of the paddle (21) is arc-shaped, and two paddle (21) are symmetrically arranged in the shape of an eight character; The lifting mechanism includes a shaft rod two (25) pivotally connected on the cantilever arm (26), the shaft rod two (25) is parallel to the cantilever arm (26), and two rack twos (28) are located outside two shaft rod twos (25), the shaft rod two (25) is coaxially fixedly connected with a gear two (24), the gear two (24) is in meshing connection with the corresponding rack two (28), the adjusting plate (3) is fixed with a rack one (23) on the side away from the rocker (6), and the rack one (23) is parallel to the direction of the strip-shaped through hole (5), the shaft rod two (25) is coaxially fixedly connected with a gear one (29), and the gear one (29) is in meshing connection with the teeth on the bottom surface of the rack one (23).

2. The sternal retractor for harvesting of the internal mammary artery according to claim 1, wherein: The clamping mechanism comprises two clamping jaws (1), which are in the shape of open downward U, and the middle part of the clamping jaw (1) is hingedly connected with an extension rod (2), and the two ends of an adjusting plate (3) are fixedly connected with the upper ends of the two extension rods (2) through a cross rod (8) respectively.

3. The sternal retractor for harvesting of the internal mammary artery as claimed in claim 2 wherein: The inner side of the clamping jaw (1) is provided with a groove (39), the groove (39) is fixedly connected with a pin shaft (36), the pin shaft (36) is rotatably connected with a semicircular plate (35), the arc contour of the semicircular plate (35) faces the middle part of the clamping jaw (1), the position of the pin shaft (36) connected with the semicircular plate (35) is away from the center of the semicircular plate (35) and close to the lower end of the semicircular plate (35), the upper end of the semicircular plate (35) is hingedly connected with the inner side wall of the groove (39) through a rubber air bag (34), the sidewall of the clamping jaw (1) is penetrated and slidably connected with a jack (38), and the end of the jack (38) located in the groove (39) can be in contact with the lower end of the semicircular plate (35), and the end of the jack (38) located outside the clamping jaw (1) is connected with the clamping jaw (1) through a spring (37).

4. The sternal retractor for harvesting of the internal mammary artery as claimed in claim 3 wherein: The clamping jaw (1) is provided with a cavity (30), and the clamping jaw (1) is fixedly connected with a pressure relief valve (31) in communication with the cavity (30), the clamping jaw (1) is provided with a channel (32), one end of the channel (32) is in communication with the cavity (30), and the other end is in communication with the rubber air bag (34) through an air pipe (33).

5. The sternal retractor for harvesting of the internal mammary artery as defined in claim 4, wherein: The adjusting plate (3) is fixedly connected with a pump cylinder (12), the pump cylinder (12) is rotatably connected with a reciprocating screw rod (13) in the pump cylinder (12), the reciprocating screw rod (13) is coaxially fixedly connected with a screw rod (16), the pump cylinder (12) is slidably connected with a piston plate (14), the reciprocating screw rod (13) penetrates and is slidably connected with the piston plate (14), the pump cylinder (12) is fixedly connected with a slide rod (15) parallel to the reciprocating screw rod (13), the slide rod (15) penetrates and is slidably connected with the piston plate (14), the two ends of the pump cylinder (12) are fixedly connected with and in communication with a one-way valve (9) and a one-way valve (10), the one-way valve (9) is in communication with the cavity (30) through an air pipe (11), the one-way valve (9) is in communication with the cavity (30), and the one-way valve (10) is in communication with the inside of the pump cylinder (12).

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