Sternum retractor

Abstract

The application discloses a sternal retractor, comprising two groups of symmetrically arranged opening mechanisms, each group of opening mechanisms comprising a sleeve, a transmission mechanism and two opening plates, wherein the inside of the sleeve is formed with a cavity, one end of the cavity is provided with an opening communicating with the outside; the two opening plates are arranged on the outer wall of the sleeve and can move along the axial direction of the sleeve; the transmission mechanism comprises a transmission main body and two first driving ends, wherein the transmission main body is arranged in the cavity, the two first driving ends are respectively slidably connected to the outer wall of the sleeve, the two first driving ends are connected with the transmission main body, the two first driving ends are respectively connected with the corresponding opening plates, and the transmission main body is configured to drive the two first driving ends to drive the two opening plates to move towards each other or away from each other. The sternal retractor can not only guarantee the requirement of exposing the surgical visual field to the maximum extent, but also can avoid the accidental risk caused by suddenly changing the direction of the retractor during the operation, thereby providing safer and more reliable medical services for clinical patients.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a sternal retractor. Background Technology

[0002] In median thoracic incision cardiac surgery, the sternal retractor is an indispensable surgical instrument. Its main function is to provide surgeons with a clear surgical field, ensuring the smooth progress of the operation. Specifically, the sternal retractor can open and stabilize the sternum, facilitating surgical manipulation to the greatest extent possible while providing direct visualization, assisting breathing, and protecting the heart and lungs. The sternal retractor is a crucial surgical instrument for surgeons performing median thoracic incision cardiac surgery, significantly improving surgical efficiency and helping to reduce the risk of unexpected intraoperative complications.

[0003] However, in commonly used sternal retractors, the rack and handle are concentrated on one side, and during surgery, this end is often positioned with the rack and handle facing the patient's head. This design can be inconvenient in cardiac surgery, as the surgical field is large and situations can change rapidly. Especially during cardiac surgery, if a sudden lesion occurs, such as touching the ascending aortic arch or dealing with the aortic bifurcation, it is necessary to hastily remove the sternal retractor and adjust its orientation, positioning the rack and handle towards the xiphoid process to fully expose the surgical field. However, at this point, the patient is often on cardiopulmonary bypass with multiple cannulas (e.g., aortic cannulas, superior and inferior vena cava cannulas, perfusion cannulas, left ventricular cannulas, etc.). Repositioning the sternal retractor and positioning the rack and handle towards the xiphoid process is not only time-consuming and laborious, but also carries the risk of accidentally dislodging a cannula, causing bleeding, or even disrupting cardiopulmonary bypass and endangering the patient's life. If a device is designed with two sets of retractors, one set can be flexibly disassembled at any time according to the needs of the operation, so as to change the direction of the retractors and avoid the unexpected risks caused by sudden changes in the direction of the retractors during the operation, it will provide safer and more reliable medical services for clinical patients. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, one objective of this invention is to provide a sternal retractor that not only ensures the maximum exposure of the surgical field but also avoids the unexpected risks caused by sudden changes in the direction of the retractor during surgery, thus providing safer and more reliable medical services for clinical patients.

[0006] To achieve the above objectives, the present invention proposes a sternal retractor, comprising: two sets of symmetrically arranged spreading mechanisms, each set of spreading mechanisms including a sleeve, a transmission mechanism, and two spreading plates, wherein the sleeve has a cavity inside, and one end of the cavity has an opening communicating with the outside; the two spreading plates are arranged on the outer wall of the sleeve and are movable along the axial direction of the sleeve; the transmission mechanism includes a transmission body and two first driving ends, wherein the transmission body is disposed in the cavity, the two first driving ends are slidably connected to the outer wall of the sleeve and connected to the transmission body, and the two first driving ends are respectively connected to the corresponding spreading plates, the transmission body is configured to drive the two first driving ends to drive the two spreading plates to move in opposite directions or in opposite directions; a power mechanism including two second driving ends, the two second driving ends being detachably connected to the end of the corresponding transmission body that extends to the outside through the opening, the power mechanism is configured to synchronously drive the two sets of transmission mechanisms to achieve synchronous linkage of the spreading plates in the two sets of spreading mechanisms.

[0007] The sternal retractor of this invention features a retractor plate that moves along a sleeve, while the transmission body is housed within a cavity, with one end extending to the outside via an opening. This means that when the retractor plate is positioned on the sternum, its power output point is on one side of the body, rather than towards the head, effectively avoiding obstruction of the surgical field and providing the surgeon with a wider and clearer surgical view. Simultaneously, the dual-retractor design, with two retractor mechanisms placed simultaneously at their respective positions on the sternum, not only further expands the field of vision at the chest but also, through connection with the power mechanism, and since the connection point between the power mechanism and the transmission body is located on one side of the sleeve, this indicates that the power mechanism is also positioned on one side of the body, not towards the head, further reducing obstruction of the surgical field. Furthermore, the power mechanism, as a power source, provides stable and synchronized power support to the two transmission bodies, ensuring their synchronous operation and driving the retractor plates in both retractor mechanisms to achieve synchronized linkage and smoothly open the sternum. This design ensures even force distribution on the sternum during retraction, significantly reducing the risk of fractures and damage to surrounding tissues, thus providing a strong guarantee for the safety and success of the surgery. Furthermore, the dual-retraction mechanism, with its detachable design, is particularly suitable for situations where, during cardiac surgery, sudden contact with the ascending aortic arch or treatment of the aortic bifurcation occurs. It can be adjusted at any time according to the needs of the surgical field, separating one of the retraction mechanisms from the power mechanism to remove the entire mechanism, leaving only one retraction mechanism to maintain sternal retraction and expose the surgical field. This saves time and effort and avoids the risks associated with sudden changes in the direction of the retractor during surgery, providing a safer and more reliable medical service for clinical patients.

[0008] In addition, the sternal retractor proposed in the above application may also have the following additional technical features:

[0009] Specifically, the transmission body includes a bidirectional screw and two threaded sleeves, wherein,

[0010] The bidirectional screw is rotatably connected in the cavity, and the free end of the bidirectional screw extends to the outside through the opening;

[0011] The sleeve has at least one through groove, and the two threaded sleeves are respectively threaded to the bidirectional screw.

[0012] A connecting plate extends from the inner wall of the first driving end toward the threaded sleeve, and one end of the connecting plate passes through the through groove and is connected to the threaded sleeve.

[0013] The expansion plate is detachably connected to the corresponding first drive end.

[0014] Specifically, the power mechanism includes a housing, a gear transmission assembly, two second drive ends, and a handle, wherein,

[0015] One end of the second drive end is rotatably connected inside the housing, and the other end of the second drive end extends outside the housing. The second drive end is detachably connected to the free end of the corresponding bidirectional screw.

[0016] The gear transmission assembly is disposed in the housing, and the gear transmission assembly is respectively connected to the two second drive ends;

[0017] The handle is rotatably connected to the housing, with one end of the handle disposed inside the housing and connected to the gear transmission assembly, and the other end of the handle disposed outside the housing.

[0018] Specifically, a matching limiting structure is provided at the transmission connection between the second drive end of the power mechanism and the transmission mechanism;

[0019] The interlocking limiting structure includes:

[0020] The limiting body is elastically connected to the free end of the second driving end;

[0021] A groove is formed on the free end of the bidirectional screw, and the limiting body can be inserted into the groove.

[0022] Specifically, the second driving end has an internal receiving cavity, and the free end of the second driving end has a sliding groove adapted to the limiting body, and the sliding groove is connected to the receiving cavity.

[0023] The limiting body is slidably connected in the groove, and a spring is provided in the receiving cavity, with the free end of the spring fixedly connected to the limiting body.

[0024] Specifically, the spreading mechanism further includes a rotating wheel, which is fixed on the peripheral wall of the bidirectional screw. One end of the rotating wheel extends through the opening into the cavity and is rotatably connected to the inner wall of the cavity.

[0025] Specifically, the power mechanism further includes two sleeves and two nuts, wherein,

[0026] The two sleeves are respectively fixed on the housing, and the two second drive ends are respectively inserted through the corresponding sleeves, and the outer wall of the sleeve is provided with a first external thread;

[0027] The outer peripheral wall of the end of the rotating wheel away from the bidirectional screw is provided with a second external thread, one end of the nut is connected to the first external thread, and the other end of the nut is connected to the second external thread.

[0028] Specifically, the expansion plate includes a collar and a support plate, wherein the collar is fixed to the outer peripheral wall of the first driving end by bolts, and the support plate is fixedly connected to the collar.

[0029] Specifically, the end of the support plate away from the collar is bent with a flange, and the flanges of the two support plates in the spreading mechanism are arranged opposite to each other.

[0030] Specifically, it also includes two baffles. Each of the two support plates arranged along the width direction of the power mechanism has a limiting groove on one side. The two sides of the baffle can be inserted into the corresponding limiting grooves. The baffle is stepped. The first surface of the baffle facing the flange is flush with the surface of the support plate. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the sternal retractor according to an embodiment of the present invention;

[0034] Figure 2This is a schematic diagram of the structure of a spreading mechanism according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram showing the state in which the spreading mechanism and the power mechanism are separated according to an embodiment of the present invention;

[0036] Figure 4 This is a cross-sectional structural schematic diagram of a spreading mechanism according to an embodiment of the present invention;

[0037] Figure 5 This is a cross-sectional structural schematic diagram of a housing according to an embodiment of the present invention;

[0038] Figure 6 This is a partial structural schematic diagram of a power mechanism according to an embodiment of the present invention;

[0039] Figure 7 This is a cross-sectional view of the second driving end according to an embodiment of the present invention;

[0040] Figure 8 This is a top view of the second drive end according to an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the structure of a baffle according to an embodiment of the present invention.

[0042] As shown in the figure: 1. Spreading mechanism; 10. Sleeve; 11. Spreading plate; 12. Transmission mechanism; 13. Rotating wheel; 100. Through groove; 110. Collar; 111. Support plate; 120. Double-acting screw; 121. Threaded sleeve; 122. First driving end; 123. Connecting plate; 1110. Flanged edge; 1111. Limiting groove; 1200. Groove.

[0043] 2. Power mechanism; 20. Housing; 21. Gear transmission assembly; 22. Second drive end; 23. Handle; 24. Sleeve; 25. Nut; 220. Limiting body; 221. Receiving cavity; 222. Slide groove; 223. Spring;

[0044] 3. Baffle; 30. First surface. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0047] The sternal retractor of the present invention will now be described with reference to the accompanying drawings.

[0048] like Figures 1-7 As shown, the sternal retractor of this embodiment of the invention may include two sets of symmetrically arranged spreading mechanisms 1 and power mechanisms 2.

[0049] Each of the supporting mechanisms 1 includes a sleeve 10, a transmission mechanism 12, and two supporting plates 11.

[0050] The sleeve 10 has a cavity inside, and one end of the cavity has an opening that communicates with the outside. Two support plates 11 are arranged on the outer wall of the sleeve 10 and can move along the axial direction of the sleeve 10.

[0051] The transmission mechanism 12 includes a transmission body and two first drive ends 122. The transmission body is disposed in a cavity, and the two first drive ends 122 are slidably connected to the outer wall of the sleeve 10. The two first drive ends 122 are connected to the transmission body and are respectively connected to the corresponding expansion plates 11. The transmission body is configured to drive the two first drive ends 122 to drive the two expansion plates 11 to move in opposite directions or away from each other.

[0052] It is understandable that the transmission mechanism 12 is used to drive the two spreading plates 11 to move in opposite directions or away from each other along the sleeve 10. Specifically, when the transmission body drives the two spreading plates 11 to move away from each other, it is used to spread the sternum. When the transmission body drives the two spreading plates 11 to move in opposite directions, it can release the tension and spread state of the sternum, so as to facilitate the smooth removal of the spreading plates 11 from the sternum.

[0053] The power mechanism 2 includes two second drive ends 22, each detachably connected to a corresponding transmission body extending to the outside through an opening. The power mechanism 2 is configured to synchronously drive the two sets of transmission mechanisms 12, thereby achieving synchronous linkage of the expansion plates 11 in the two sets of expansion mechanisms 1. Specifically, the expansion plate 11 can move along the sleeve 10, while the transmission body is arranged within the cavity, with one end extending to the outside through an opening. This means that when the expansion plate 11 is positioned at the sternum, its power output point is on one side of the body, rather than towards the head, effectively avoiding obstruction of the surgical field and providing the surgeon with a wider and clearer surgical field.

[0054] Meanwhile, a double-spreading mechanism 1 is adopted. After placing the two spreading mechanisms 1 at their respective positions on the sternum, they are connected to the power mechanism 2. Since the connection point between the power mechanism 2 and the transmission body is located on one side of the sleeve 10, it means that the power mechanism 2 is also placed on one side of the human body, not facing the head, further reducing obstruction of the surgical field of view.

[0055] Meanwhile, the power mechanism 2, acting as a power source, provides stable and synchronous power support to the two transmission bodies, ensuring their synchronized operation. This, in turn, drives the expansion plates 11 in the two expansion mechanisms 1 to achieve synchronous linkage and smoothly open the sternum together. This ensures that the force on the sternum is evenly distributed during the expansion process, greatly reducing the risk of fractures and damage to surrounding tissues, and providing a strong guarantee for the safety and success of the surgery.

[0056] In addition, you can refer to Figure 4 The device employs a dual-disassembly retractable retractor mechanism 1, which is particularly suitable for situations where, during cardiac surgery, the ascending aortic arch is suddenly touched or aortic bifurcation lesions are addressed. Depending on the intraoperative field of vision, one of the retractors 1 can be separated from the power mechanism 2, allowing for the removal of the retractor 1. Only one retractor 1 remains to maintain sternal distension and expose the surgical field of vision. This saves time and effort and avoids the unexpected risks associated with sudden changes in the direction of the retractor during surgery, providing a safer and more reliable medical service for clinical patients.

[0057] In one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 4 As shown, the transmission body includes a bidirectional screw 120 and two threaded sleeves 121.

[0058] The bidirectional screw 120 is rotatably connected in the cavity, and the free end of the bidirectional screw 120 extends to the outside through an opening. The bidirectional screw 120 can be rotatably connected in the cavity through bearings, and there can be multiple bearings, which can be arranged according to the actual situation.

[0059] At least one through groove 100 is provided on the sleeve 10. Two threaded sleeves 121 are respectively threaded to the bidirectional screw 120. The inner wall of the first drive end 122 extends to one side of the threaded sleeve 121 to form a connecting plate 123. One end of the connecting plate 123 passes through the through groove 100 and is connected to the threaded sleeve 121. The spreading plate 11 is detachably connected to the corresponding first drive end 122.

[0060] It should be noted that the first driving end 122 is ring-shaped and is slidably sleeved on the outer wall of the sleeve 10. The first driving end 122 is connected to the threaded sleeve 121 through the connecting plate 123. The connecting plate 123 not only serves as a connection, but also cooperates with the through groove 100 to effectively restrict the rotational freedom of the threaded sleeve 121, ensuring that it can only move linearly along the axial direction of the sleeve 10.

[0061] Specifically, the bidirectional screw 120 refers to a screw with two threaded segments (left-hand and right-hand) in opposite directions. Each threaded segment is threadedly connected to a threaded sleeve 121. When the bidirectional screw 120 rotates, it can drive the two threaded sleeves 121 to move in opposite directions, thereby achieving synchronous opposite or back-to-back movement. This drives the two axially arranged expansion plates 11 to move synchronously opposite or back-to-back. Since one end of the bidirectional screw 120 extends outward through an opening, when a single expansion mechanism 1 is used independently, its power source can be manually operated, that is, by directly rotating the exposed end of the bidirectional screw 120, thereby driving the two expansion plates 11 to move.

[0062] In addition, the bidirectional screw 120 can also be connected to an external power mechanism 2, which serves as a power supply source to drive the two opening mechanisms 1 to operate synchronously.

[0063] In one embodiment of the present invention, such as Figure 1 and Figure 5 As shown, the power mechanism 2 includes a housing 20, a gear transmission assembly 21, two second drive ends 22, and a handle 23.

[0064] One end of the second drive end 22 is rotatably connected inside the housing 20, and the other end of the second drive end 22 extends outside the housing 20. The second drive end 22 is detachably connected to the free end of the corresponding bidirectional screw 120. The gear transmission assembly 21 is disposed in the housing 20 and is connected to the two second drive ends 22 respectively. The handle 23 is rotatably connected to the housing 20, and one end of the handle 23 is arranged inside the housing 20 and connected to the gear transmission assembly 21, while the other end of the handle 23 is arranged outside the housing 20.

[0065] It should be noted that the gear transmission assembly 21 consists of an odd number of sequentially meshing gears, for example, referring to... Figure 5 The gear transmission assembly 21 consists of three gears. The middle gear is connected to the handle 23, and the other two gears are connected to the second drive end 22 respectively. When the handle 23 is rotated, the middle gear drives the two gears on both sides to rotate synchronously. Since the second drive end 22 is connected to the bidirectional screw 120, when the second drive end 22 rotates, it can synchronously drive the bidirectional screw 120 to rotate, thereby realizing the synchronous operation of the two opening mechanisms 1.

[0066] In one embodiment of the present invention, such as Figure 2 and Figure 6 As shown, a matching limiting structure is provided at the transmission connection between the second drive end 22 of the power mechanism 2 and the transmission mechanism 12, wherein the matching limiting structure includes a limiting body 220 and a groove 1200.

[0067] The limiting body 220 is elastically connected to the free end of the second driving end 22, and the groove 1200 is opened on the free end of the bidirectional screw 120. The limiting body 220 can be inserted into the groove 1200.

[0068] Specifically, when achieving the transmission connection between the second drive end 22 and the free end of the bidirectional screw 120, it is only necessary to insert the limiting body 220 into the groove 1200. Since the limiting body 220 and the groove 1200 have the same shape and size, a rigid mechanical connection is formed. When the bidirectional screw 120 rotates, the torque is directly transmitted through the contact surface between the side wall of the limiting body 220 and the groove 1200, eliminating the risk of relative slippage. At the same time, the limiting body 220 and the groove 1200 have a unique correspondence, allowing operators to quickly center and insert without complex adjustments, significantly shortening assembly time. The shape of the limiting body 220 can be spline, hexagonal, rectangular, etc.

[0069] Furthermore, such as Figure 7 and Figure 8 As shown, the second driving end 22 has a receiving cavity 221 inside. The free end of the second driving end 22 has a sliding groove 222 that is adapted to the limiting body 220. The sliding groove 222 is connected to the receiving cavity 221. The limiting body 220 is slidably connected in the sliding groove 222. A spring 223 is provided in the receiving cavity 221. The free end of the spring 223 is fixedly connected to the limiting body 220.

[0070] In the above scheme, by setting the spring 223, the stability of the limiting body 220 inserted into the groove 1200 can be improved. On the other hand, when disassembling a set of opening mechanisms 1, it is not necessary to remove the entire power mechanism 2. Only the limiting body 220 needs to be pulled away from the groove 1200, thereby separating the limiting body 220 from the groove 1200. Then the bidirectional screw 120 can be rotated to make the two opening plates 11 move closer to each other, so as to remove the opening mechanism 1.

[0071] In addition, since the slide groove 222 is adapted to the limiting body 220, it can play a limiting role when the limiting body 220 is connected to the groove 1200 and rotates, so as to ensure the stability when the second drive end 22 drives the bidirectional screw 120 to rotate.

[0072] In one embodiment of the present invention, such as Figure 1 As shown, the spreading mechanism 1 also includes a rotating wheel 13, which is fixed on the peripheral wall of the bidirectional screw 120. One end of the rotating wheel 13 extends into the cavity through an opening and is rotatably connected to the inner wall of the cavity.

[0073] In the above scheme, by setting the rotating wheel 13, it is convenient for relevant personnel to use the spreading mechanism 1 independently, which greatly increases the contact area between the hand and the bidirectional screw 120. This allows relevant personnel to apply rotational force more easily and conveniently when rotating the bidirectional screw 120, thereby effectively improving the convenience and comfort of operation.

[0074] In one embodiment of the present invention, such as Figure 3 and Figure 6 As shown, the power mechanism 2 also includes two sleeves 24 and two nuts 25.

[0075] Two sleeves 24 are fixed on the housing 20, and two second drive ends 22 are respectively inserted through the corresponding sleeves 24. The outer wall of the sleeve 24 is provided with a first external thread, and the outer peripheral wall of the end of the rotating wheel 13 away from the bidirectional screw 120 is provided with a second external thread. One end of the nut 25 is connected to the first external thread, and the other end of the nut 25 is connected to the second external thread.

[0076] Specifically, when the bidirectional screw 120 is connected to the second drive end 22, the nut 25 is rotated so that the nut 25 is simultaneously connected to the first external thread and the second external thread. That is, the nut 25 is simultaneously connected to one end of the rotating wheel 13 and the sleeve 24, thereby restricting the position of the bidirectional screw 120 and the second drive end 22 to ensure the stability of the bidirectional screw 120 when the second drive end 22 drives it to rotate.

[0077] Furthermore, when it is necessary to disassemble a spreading mechanism 1, only the corresponding nut 25 needs to be turned to disengage it from the sleeve 24, which will release the restriction between the second drive end 22 and the bidirectional screw 120.

[0078] Specifically, when the bidirectional screw 120 is connected to the second drive end 22, the operation involves rotating the nut 25, causing it to move towards the bidirectional screw 120. This ensures a tight connection between the nut 25 and both the first and second external threads on the bidirectional screw 120. From a connection perspective, one end of the nut 25 is connected to the rotating wheel 13, and the other end is connected to the sleeve 24. This connection method effectively limits the relative position of the bidirectional screw 120 and the second drive end 22, thereby ensuring stability during the rotation of the bidirectional screw 120 driven by the second drive end 22.

[0079] Furthermore, disassembling a support mechanism 1 is relatively simple. Simply loosen the corresponding nut 25 to separate it from the second external thread, thus releasing the positional constraint between the second drive end 22 and the bidirectional screw 120, facilitating subsequent disassembly.

[0080] In one embodiment of the present invention, such as Figure 1As shown, the expansion plate 11 includes a collar 110 and a support plate 111. The collar 110 is fixed to the outer peripheral wall of the first drive end 122 by bolts, and the support plate 111 is fixedly connected to the collar 110.

[0081] It is understandable that the collar 110 has a light hole, and the outer peripheral wall of the first drive end 122 has a threaded hole corresponding to the light hole. The bolt passes through the light hole and is threaded into the threaded hole, thereby fixing the collar 110 to the first drive end 122. The bolt makes the collar 110 and the first drive end 122 form a detachable connection, so as to facilitate the removal of the support plate 11 for cleaning and disinfection.

[0082] Furthermore, to more effectively broaden the field of vision, a crossbar was added integrally to the support plate 111. Through this ingenious design, the crossbar can increase the distance between the support plate 111 and the collar 110, thereby allowing the sleeve 10 to maintain a greater distance from the chest and providing medical staff with a wider field of vision.

[0083] In one embodiment of the present invention, such as Figure 1 As shown, the end of the support plate 111 away from the collar 110 is bent with a flange 1110, and the flanges 1110 of the two support plates 111 in the opening mechanism 1 are arranged opposite to each other.

[0084] Understandably, setting the flange 1110 can increase the support plate 111 sternum. stretch This increases the contact area during sternal expansion, improving stability while reducing the risk of sternal slippage.

[0085] In one embodiment of the present invention, such as Figure 1 As shown, the sternal retractor also includes two baffles 3. The two support plates 111 arranged along the width direction of the power mechanism 2 have limit grooves 1111 on their adjacent sides. The two sides of the baffles 3 can be inserted into the corresponding limit grooves 1111. The width direction refers to the direction from one opening mechanism 1 to the other opening mechanism 1.

[0086] In the above scheme, the baffle 3 effectively increases the contact area between the support plate 111 and the sternum. During the movement of the sternum by the support plate 111, this increased contact area significantly improves the uniformity of force application, thereby reducing the risk of damage to the sternum due to uneven force. Furthermore, the baffle 3 simultaneously limits the movement of the two support plates 111 arranged side-by-side along the width direction in the two opening mechanisms 1, further enhancing the synchronicity of the movement of the support plates 111 in the two different opening mechanisms 1, ensuring the precision and coordination of the opening actions during the operation.

[0087] During installation, simply insert both sides of the baffle 3 into the corresponding limiting grooves 1111. During removal, simply pull the baffle 3 out of the limiting grooves 1111.

[0088] Furthermore, such as Figure 9 As shown, the baffle 3 is stepped, and the first surface 30 of the baffle 3 facing the flange 1110 is flush with the surface of the support plate 111, so that the baffle 3 and the support plate 111 can simultaneously contact the sternum, avoiding the situation where the support plate 111 contacts the sternum but the baffle 3 cannot contact the sternum. This ensures that the baffle 3 and the support plate 111 share the force, avoid local stress concentration, and reduce the risk of accidental sternal fracture or damage to surrounding tissues.

[0089] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0090] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sternal retractor, characterized in that, The utility model relates to a kind of two groups of symmetrically arranged distraction mechanism, each group of the distraction mechanism includes sleeve, transmission mechanism and two distraction plates, wherein, The cavity is formed in the sleeve, and one end of the cavity is provided with an opening communicating with the outside; Two distraction plates are arranged on the outer wall of the sleeve and can move axially along the sleeve; The transmission mechanism includes a transmission body and two first driving ends, wherein the transmission body is arranged in the cavity, two first driving ends are respectively connected to the outer wall of the sleeve, and the transmission body is connected to the first driving end, and the first driving end is respectively connected to the corresponding distraction plate; the transmission body is configured to drive two first driving ends to drive two distraction plates to move towards or away from each other; Power mechanism includes two second driving ends, and the second driving end is respectively and detachably connected to the corresponding transmission body through the opening to extend to the outside, and the power mechanism is configured to synchronously drive two groups of transmission mechanism to operate, so as to realize the synchronous linkage of the distraction plate in two groups of distraction mechanism; Two groups of distraction mechanism are arranged in the radial direction of the sleeve. The transmission body includes a bidirectional screw and two threaded sleeves, wherein, 2. The sternal retractor of claim 1, wherein, The bidirectional screw is rotatably connected in the cavity, and the free end of the bidirectional screw extends to the outside through the opening; At least one through slot is formed in the sleeve, and two threaded sleeves are respectively threadedly connected to the bidirectional screw; The inner wall of the first driving end extends to the side of the threaded sleeve, and the one end of the connecting plate penetrates through the through slot and is connected to the threaded sleeve; The distraction plate is detachably connected to the corresponding first driving end. The power mechanism includes a housing, a gear transmission assembly, two second driving ends and a handle, wherein, 3. The sternal retractor of claim 2, wherein, One end of the second driving end is rotatably connected in the housing, and the other end of the second driving end extends to the outside of the housing, and the second driving end is detachably connected to the free end of the corresponding bidirectional screw; The gear transmission assembly is arranged in the housing, and the gear transmission assembly is respectively connected to two second driving ends; The handle is rotatably connected to the housing, and one end of the handle is arranged in the housing and connected to the gear transmission assembly, and the other end of the handle is arranged outside the housing. The second driving end of the power mechanism is provided with a mutual matching limiting structure at the transmission connection of the transmission mechanism; 4. The sternal retractor of claim 3, wherein, The mutual matching limiting structure includes: A limiting body is elastically connected to the free end of the second driving end; A groove is formed in the free end of the bidirectional screw, and the limiting body can be inserted into the groove. The second driving end is provided with a containing cavity, and a sliding groove matched with the limiting body is formed in the free end of the second driving end, and the sliding groove is in communication with the containing cavity; 5. The sternal retractor of claim 4, wherein, The limiting body is slidably connected in the sliding groove, and a spring is arranged in the containing cavity, and the free end of the spring is fixedly connected to the limiting body. ​ 6. The sternal retractor of claim 3, wherein, The distraction mechanism further comprises a rotating wheel fixed on the peripheral wall of the bidirectional screw rod, one end of the rotating wheel extending into the cavity through the opening and being rotatably connected with the inner wall of the cavity.

7. The sternal retractor according to claim 6, wherein, The power mechanism further comprises two sleeves and two nuts, The two sleeves are respectively fixed on the shell, and the two second driving ends respectively pass through the corresponding sleeves, and a first external thread is formed on the outer wall of the sleeve; A second external thread is formed on the peripheral wall of the end of the rotating wheel away from the bidirectional screw rod, one end of the nut is connected with the first external thread, and the other end of the nut is connected with the second external thread.

8. The sternal retractor of claim 2, wherein, The distraction plate comprises a sleeve ring and a support plate, the sleeve ring is fixed on the peripheral wall of the first driving end by bolts, and the support plate is fixedly connected with the sleeve ring.

9. The sternal retractor according to claim 8, wherein, The end of the support plate away from the sleeve ring is bent with a flange, and the flanges of the two support plates in the distraction mechanism are arranged in opposite directions.

10. The sternal retractor of claim 9, wherein, Two baffles are further included, a limiting groove is formed on one side of each of the two support plates arranged along the width direction of the power mechanism, the two sides of the baffle are respectively inserted into the corresponding limiting groove, and the baffle is in a stepped shape, and the first surface of the baffle towards the flange is flush with the surface of the support plate.

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