A knife retracting device of electric stapler and electric stapler

Abstract

The present invention provides a tool retracting device for an electric stapler, comprising a support shaft, a tool retracting shaft mounted on the support shaft, a tool retracting gear and a transmission gear, wherein the axial position of the transmission gear relative to the tool retracting gear and the tool retracting shaft is adjustable; the tool retracting shaft has a moving space for circumferential rotation relative to the tool retracting gear and has a first position and a second position for circumferential movement, the tool retracting shaft is at the first position, and the tool retracting shaft and the tool retracting gear rotate synchronously with the transmission gear; when the tool retracting shaft rotates to the second position, the transmission gear disengages from the tool retracting gear, and the tool retracting shaft and the tool retracting gear rotate synchronously in a second direction, and the first direction is opposite to the second direction. An electric stapler is also provided, comprising a driving mechanism, a tool retracting mechanism, a mounting bracket and the tool retracting device described above, wherein the tool retracting device is mounted via the mounting bracket, and the tool retracting device is connected to the driving mechanism and the tool retracting mechanism. The technical solution of the present invention realizes that when the electric function fails and the electric driving mechanism is locked, the manual tool retracting function can still be performed smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a knife retracting device of an electric stapler and an electric stapler. Background Art

[0002] Electric staplers include traditional manual laparoscopic staplers and electric staplers. Compared with the effects of traditional manual laparoscopic staplers after cutting and suturing tissues, the electric laparoscopic staplers can make the anastomosis smoother and neater after cutting and suturing, which can enable patients to recover faster and better from wounds after surgery.

[0003] The existing electric staplers are driven by an electric drive mechanism, such as the drive mechanism, power handle and stapler with announcement number CN111920471B. In the stapler structure, the closing, cutting and retracting functions of the electric stapler are realized by the electric drive mechanism and related control circuits. In some cases, there is a risk of failure of the electric function, resulting in a huge surgical risk that the stapler jaws cannot be opened and the cutting blade cannot be retracted, causing serious consequences to the surgical process. Therefore, the manual opening and closing function of the electric stapler jaws and the manual retracting function after cutting are particularly necessary. Therefore, it is urgent to design a manual retracting device to avoid the electric drive mechanism being locked after the electric function fails, making it impossible to retract the blade or hindering the retracting operation. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a knife retracting device for an electric stapler, the key of which is to include:

[0005] Support shaft,

[0006] A tool retraction shaft is mounted on the support shaft;

[0007] A tool retracting gear, mounted on the tool retracting shaft and used to connect the tool retracting mechanism;

[0008] A transmission gear, mounted on the support shaft and used to connect the drive mechanism, wherein the axial position of the transmission gear relative to the retracting gear and the retracting shaft is adjustable;

[0009] The retractor shaft has a moving space for circumferential rotation relative to the retractor gear, and the retractor shaft has a first position and a second position for circumferential movement in the moving space. When the retractor shaft is located at the first position, the retractor shaft and the retractor gear are meshed with the end face of the transmission gear and rotate synchronously along the first direction; the retractor shaft rotates along the second direction and moves from the first position to the second position, and the ejection portion provided on the retractor shaft presses the transmission gear to move away from the retractor gear. When the retractor shaft rotates to the second position, the transmission gear is disengaged from the end face of the retractor gear and the retractor shaft, and the retractor shaft rotates synchronously with the retractor gear along the second direction, and the first direction is opposite to the second direction.

[0010] Preferably, the retractor shaft is rotatably sleeved on the support shaft, and the retractor gear is sleeved on the retractor shaft. The retractor shaft and the retractor gear are matched with each other through teeth and grooves, and the teeth of the retractor shaft have the first position and the second position of circumferential rotation in the groove of the corresponding retractor gear.

[0011] Preferably, the ejection portion of the retracting shaft includes a first end face tooth arranged on the end face of the retracting shaft, the end face of the retracting gear is provided with a second end face tooth, and the transmission gear is provided with a third end face tooth meshing with the first end face tooth and the second end face tooth; the second end face tooth of the retracting gear is located on the outer ring of the third end face tooth; when the retracting shaft is in the first position, the first end face tooth is opposite to the second end face tooth and meshes with the third end face tooth; when the retracting shaft is in the second position, the first end face tooth and the second end face tooth are misaligned and disengaged from the third end face tooth.

[0012] Preferably, the first end face tooth comprises a tooth top, a tooth groove and a tooth surface extending from the tooth top to the bottom of an adjacent tooth groove, and the tooth surface is a surface inclined relative to the axial cross section of the tool withdrawal shaft.

[0013] Preferably, the tooth tops of the second end face teeth of the retracting gear and the third end face teeth of the transmission gear are both smooth planes.

[0014] Preferably, the transmission gear is connected to an elastic support member and through the elastic support member, the transmission gear is in contact with the retracting gear in a normal state.

[0015] Preferably, the retracting gear is connected to a thrust bearing and the axial position is fixed by the thrust bearing.

[0016] Preferably, a limiting portion is provided on the tool retracting shaft, and the tool retracting gear cooperates with the limiting portion to axially limit the tool retracting shaft.

[0017] Preferably, the retracting shaft is provided with a retracting knob for manually rotating the retracting shaft.

[0018] An electric stapler is also provided, comprising a driving mechanism and a knife retracting mechanism, the key of which is that it comprises a mounting bracket and a knife retracting device as described in any of the above examples, the knife retracting device is installed through the mounting bracket, the transmission gear of the knife retracting device is connected to the driving mechanism, and the knife retracting gear of the knife retracting device is connected to the knife retracting mechanism.

[0019] As described above, the knife retraction device and the electric stapler of the electric stapler of the present invention have at least the following beneficial effects: in normal state, the knife retraction shaft and the knife retraction gear are meshed with the end face of the transmission gear and rotate synchronously along the first direction, and are used for the driving mechanism to normally drive the knife retraction mechanism to push the knife to perform the cutting action; when the electric function fails or manual knife retraction is required, the knife retraction shaft rotates along the second direction, and the ejection portion of the knife retraction shaft ejects the transmission gear axially, and when it reaches the second position, the transmission gear and the knife retraction gear are disengaged, and the transmission between the transmission gear, the knife retraction gear and the knife retraction shaft fails, and the knife retraction shaft can drive the knife retraction gear to continue to rotate along the second direction and push the knife retraction mechanism to perform the knife retraction action, thereby realizing that when the electric function fails and the electric drive mechanism is locked, the function of manual knife retraction can still be performed smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the internal structure of an electric stapler shown in an exemplary embodiment of the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the decomposition of

[0022] Figure 3 is a schematic structural diagram of a normal state of a knife retracting device of an electric stapler shown in an exemplary embodiment of the present application;

[0023] Figure 4 yes Figure 3 Schematic diagram of the cooperation between the retracting gear and the transmission gear after the middle retracting shaft pushes the transmission gear out;

[0024] Figure 5 yes Figure 4 Schematic diagram of the cooperation between the middle retract shaft and the transmission gear after the middle retract shaft pushes the transmission gear out;

[0025] Figure 6 It is a schematic diagram of the axial cross section of the tool withdrawal device under normal conditions;

[0026] Figure 7 It is a schematic diagram of the matching state between the retracting shaft and the retracting gear when retracting;

[0027] Figure 8 It is a schematic diagram of the state of the latching teeth and the latching slot when they are in the first position under normal conditions;

[0028] Fig. 9 yes Figure 8A schematic diagram of the state when the middle tool retraction axis rotates to the second position along the second direction;

[0029] Fig.10 is a schematic diagram of the upward plane when the tool retracting shaft and the tool retracting gear are in the first position under normal conditions;

[0030] Fig.11 yes Fig.10 A schematic diagram of an upward plane when the middle tool retraction axis rotates to a second position along a second direction;

[0031] Fig.12 It is a schematic diagram of the structure of the retract shaft and the retract knob.

[0032] Among them, 1-driving mechanism; 2-retracting mechanism; 3-mounting bracket; 4-overload protection device; 401-support shaft; 402-retracting shaft; 403-retracting gear; 404-transmission gear; 405-elastic support member; 406-gear set; 407-thrust bearing; 408-retracting knob; 4a-first end face tooth; 4b-second end face tooth; 4c-third end face tooth; 5-limiting part; 6-tooth top; 7-tooth groove; 8-tooth surface. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0034] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in schematic form rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0035] Figure 1The figure is a schematic diagram of the internal structure of an electric stapler shown in an exemplary embodiment of the present invention. The electric stapler shown in the figure can be used in laparoscopic surgery, for example, introduced into the surgical area through a puncture device, and can also be used in open surgery. In some embodiments, the electric stapler is configured to be reusable with multiple disposable nail magazines. In other embodiments, the handle and a portion of the elongated sleeve of the electric stapler can be reused, while the jaw assembly and the rest of the elongated sleeve constitute a disposable nail magazine, in which case the nail magazine and the nail magazine are combined into one. In some other embodiments, although the nail magazine is detachably connected to the rest of the electric stapler, the nail magazine can still be removed from the nail magazine so that after a firing is completed, a new nail magazine can be replaced and loaded for reuse. In the figure, the electric stapler uses a disposable nail magazine and combines the nail magazine with the nail magazine. It should be understood that the electric stapler of this article is applicable to any of the above configurations and is not limited to these configurations.

[0036] Figure 2 for Figure 1 See the attached diagram for the decomposition diagram. Figure 1 and Figure 2 As shown, an electric stapler includes a driving mechanism 1, a knife retracting mechanism 2, a mounting bracket 3 and a knife retracting device 4. The knife retracting device 4 is mounted through the mounting bracket 3, and the knife retracting device 4 is connected to the driving mechanism 1 and the knife retracting mechanism 2. Under normal conditions, the driving mechanism 1 drives the knife retracting device 4 and transmits torque to the knife retracting mechanism 2, pushing the cutting knife to perform actions such as tissue cutting and jaw closing. When manual knife retracting is required, the transmission between the knife retracting device 4 and the driving mechanism 1 fails, and the knife retracting action can be completed by manually operating the knife retracting device 4 to push the knife retracting mechanism 2 to move in the opposite direction. The specific configuration and driving method of the stapler jaw position can be referred to the published Chinese patent application CN113729823A, the authorized Chinese patents CN112914644B, CN111920471B, etc. The disclosures of the above patent documents are incorporated herein by reference.

[0037] Figure 3 This is a schematic structural diagram of a knife retracting device of an electric stapler in a normal state, shown in an exemplary embodiment of the present invention. Figure 4 for Figure 3 The diagram of the cooperation between the retracting gear and the transmission gear after the middle retracting shaft pushes the transmission gear out. Figure 3 and Figure 4 Shown and combined Figure 1 and 2 To illustrate, a knife retracting device of an electric stapler includes a support shaft 401, a knife retracting shaft 402 rotatably sleeved on the support shaft 401, a knife retracting gear 403 mounted on the knife retracting shaft 402 and used to connect to the knife retracting mechanism 2, and a transmission gear 404 rotatably sleeved on the support shaft 401 and used to connect to the driving mechanism 1. In the actual implementation process, refer to the attached Figure 6 As shown, the transmission gear 404 can be directly meshed with the end gear of the output shaft of the driving mechanism 1 through the end gear, and an elastic support member 405 is provided between the transmission gear 404 and the end gear of the output shaft to keep the transmission gear 404 adjustable in the axial position. Figure 2 and 3 As shown, the transmission gear 404 can also be independently installed on the support shaft 401, and the electric drive mechanism 1 as a whole transmits the electric power to the transmission gear 404 through a single-stage or multi-stage gear set 406, and the elastic support member 405 is arranged between the transmission gear 404 and the end face teeth in the gear set 406 to keep the transmission gear 404 adjustable in the axial position, so that in normal state, the elastic support member 405 makes the transmission gear 404 abut against the retracting gear 403, and through the support of the elastic support member 405, the retracting gear 403 is connected to a thrust bearing 407 and the axial position is fixed by the thrust bearing 407. No matter which method is used, it can be adaptively selected according to the specific installation space and structure of the electric stapler.

[0038] In the actual implementation process, the elastic support member 405 can be an elastic element such as a coil spring or elastic rubber, which is pre-compressed and installed between the transmission gear 404 and the gear set 406, and is biased to the transmission gear 404 in the direction of keeping the transmission gear 404 engaged with the retracting gear 403. It is conceivable that in other embodiments, it is also feasible to pre-tension the elastic support member 405 and keep it biased against the transmission gear 404.

[0039] The tool retracting shaft 402 has a moving space for circumferential rotation relative to the tool retracting gear 403, and the tool retracting shaft 402 has a first position and a second position for circumferential movement in the moving space. Figure 3 When the tool retracting shaft 402 is located at the first position, the tool retracting shaft 402 and the tool retracting gear 403 are meshed with the end surface of the transmission gear 404 and rotate synchronously along the first direction; Figure 4 As shown, the retracting shaft 402 rotates along the second direction and moves from the first position to the second position. The ejection portion provided on the retracting shaft 402 presses the transmission gear 404 to move away from the retracting gear 403. When the retracting shaft 402 rotates to the second position, the transmission gear 404 is disengaged from the end surface of the retracting gear 403 and the retracting shaft 402. The retracting shaft 402 and the retracting gear 403 rotate synchronously along the second direction. The first direction is opposite to the second direction. Fig.12 As shown in the actual implementation process, the retracting shaft 402 is provided with a retracting knob 408 . As an additional accessory, the retracting knob 408 is installed on the retracting shaft 402 when manual retracting is required, so as to manually rotate the retracting shaft 402 .

[0040] Specifically, in some embodiments, in combination with Figure 8 and 9 As shown, the tool retracting shaft 402 and the tool retracting gear 403 are matched through a clamping tooth and a clamping groove, and the moving space of the clamping tooth in the corresponding clamping groove serves as the moving space for the tool retracting shaft 402 to rotate axially relative to the tool retracting gear 403. The clamping tooth of the tool retracting shaft 402 has the first position and the second position of circumferential rotation in the clamping groove of the corresponding tool retracting gear 403. The clamping tooth moves back and forth between the first position and the second position in the corresponding clamping groove along the circumferential direction.

[0041] For more details, please refer to the attached Figure 5 and 7 As shown, the ejection portion of the retracting shaft 402 includes a first end face tooth 4a arranged on the end face of the retracting shaft 402, the end face of the retracting gear 403 is provided with a second end face tooth 4b, and the transmission gear 404 is provided with a third end face tooth 4c meshing with the first end face tooth 4a and the second end face tooth 4b; the second end face tooth 4b of the retracting gear 403 is located on the outer ring of the third end face tooth 4c.

[0042] Combined with Figure 8 and 10 As shown, when the knife-retracting shaft 402 is located at the first position, the first end face tooth 4a is directly opposite to the second end face tooth 4b and meshes with the third end face tooth 4c. At this time, the knife-retracting shaft 402 and the knife-retracting gear 403 are meshed with the transmission gear 404 at the same time and can rotate synchronously along the first direction, and the driving mechanism 1 can perform normal push cutting on the knife-retracting mechanism 2 through the knife-retracting device 4.

[0043] Combined with Fig. 9 and 11 As shown, when the retracting shaft 402 is in the second position, the first end face teeth 4a and the second end face teeth 4b are misaligned and disengaged from the third end face teeth 4c. That is, the first end face teeth 4a of the retracting shaft 402 and the second end face teeth 4b of the retracting gear 403 are teeth opposite to each other and the teeth are misaligned, so the third end face teeth 4c of the transmission gear 404 cannot mesh with the first end face teeth 4a of the retracting shaft 402 and the second end face teeth 4b of the retracting gear 403, so that the transmission gear 404 and the retracting gear 403 are in a disengaged state, and the retracting shaft 402 and the transmission gear 404 can continue to rotate synchronously along the second direction, and the torque will not be transmitted to the transmission gear 404. The transmission between the retracting shaft 402, the retracting gear 403 and the transmission gear 404 is guaranteed to fail, so when the electric function fails and the electric drive mechanism 1 is locked, the manual retracting action can be completed smoothly.

[0044] In some embodiments, the combination Figure 5 and 6As shown, the tool retracting shaft 402 is provided with a limiting portion 5, and the tool retracting gear 403 cooperates with the limiting portion 5 and axially limits the tool retracting shaft 402. The axial position of the tool retracting shaft 402 is fixed by the tool retracting gear 403 with a fixed axial position.

[0045] In some embodiments, the first end face tooth 4a includes a tooth top 6, a tooth groove 7, and a tooth surface 8 extending from the tooth top 6 to the bottom of the adjacent tooth groove 7, and the tooth surface 8 is a surface inclined relative to the axial section of the retracting shaft 402. In the actual implementation process, the tooth surface 8 of the second end face tooth 4b and the third end face tooth 4c may be an inclined surface or not, and it is mainly necessary to ensure that the first end face tooth 4a has an inclined tooth surface 8, so as to ensure that the retracting shaft 402 can easily disengage from the transmission gear 404 through the inclined tooth surface 8, and overcome the elastic force of the elastic support member 405 to push the transmission gear 404 out of the retracting gear 403, so that the transmission gear 404 is disengaged from the retracting gear 403. At the same time, since the first end face tooth 4a and the second end face tooth 4b are staggered, the reset stroke of the third end face tooth 4c of the transmission gear is blocked, so that it is always in a disengaged state.

[0046] In addition, in some embodiments, the tooth tops 6 of the second end face teeth 4b of the retracting gear 403 and the third end face teeth 4c of the transmission gear 404 are both smooth planes. When the transmission gear 404 and the retracting gear 403 slide relative to each other, they maintain surface-to-surface contact and rotate more smoothly.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A knife retracting device for an electric stapler, characterized in that: include: Support shaft, A tool retracting shaft, mounted on the support shaft; A tool retracting gear, mounted on the tool retracting shaft and used to connect the tool retracting mechanism; A transmission gear, mounted on the support shaft and used to connect the drive mechanism, wherein the axial position of the transmission gear relative to the retracting gear and the retracting shaft is adjustable; The retractor shaft has a moving space for circumferential rotation relative to the retractor gear, and the retractor shaft has a first position and a second position for circumferential movement in the moving space. When the retractor shaft is located at the first position, the retractor shaft and the retractor gear are meshed with the end face of the transmission gear and rotate synchronously along the first direction; when the retractor shaft rotates along the second direction, it moves from the first position to the second position, and the ejection portion provided on the retractor shaft presses the transmission gear to move away from the retractor gear. When the retractor shaft rotates to the second position, the transmission gear is disengaged from the end face of the retractor gear and the retractor shaft, and the retractor shaft rotates synchronously with the retractor gear along the second direction, and the first direction is opposite to the second direction.

2. The knife retracting device of the electric stapler according to claim 1, characterized in that: The tool retracting shaft is rotatably sleeved on the support shaft, and the tool retracting gear is sleeved on the tool retracting shaft. The tool retracting shaft and the tool retracting gear are matched through teeth and grooves, and the teeth of the tool retracting shaft have the first position and the second position of circumferential rotation in the corresponding grooves of the tool retracting gear.

3. The knife retracting device of the electric stapler according to claim 2, characterized in that: The ejection portion of the retracting shaft includes a first end face tooth arranged on the end face of the retracting shaft, the end face of the retracting gear is provided with a second end face tooth, and the transmission gear is provided with a third end face tooth meshing with the first end face tooth and the second end face tooth; the second end face tooth of the retracting gear is located on the outer ring of the third end face tooth; when the retracting shaft is in the first position, the first end face tooth is opposite to the second end face tooth and meshes with the third end face tooth; when the retracting shaft is in the second position, the first end face tooth and the second end face tooth are misaligned and disengaged from the third end face tooth.

4. The knife retracting device of the electric stapler according to claim 3, characterized in that: The first end face tooth comprises a tooth top, a tooth groove and a tooth surface extending from the tooth top to the bottom of an adjacent tooth groove, wherein the tooth surface is a surface inclined relative to the axial section of the tool withdrawal shaft.

5. The knife retracting device of the electric stapler according to claim 4, characterized in that: The tooth tops of the second end face teeth of the retracting gear and the third end face teeth of the transmission gear are both smooth planes.

6. The knife retracting device of the electric stapler according to any one of claims 1 to 5, characterized in that: The transmission gear is connected with an elastic support member and passes through the elastic support member, so that the transmission gear abuts against the retracting gear in a normal state.

7. The knife retracting device of the electric stapler according to claim 6, characterized in that: The retracting gear is connected to a thrust bearing and the axial position is fixed by the thrust bearing.

8. The knife retracting device of the electric stapler according to claim 7, characterized in that: The tool retracting shaft is provided with a limiting portion, and the tool retracting gear cooperates with the limiting portion to axially limit the tool retracting shaft.

9. The knife retracting device of the electric stapler according to claim 8, characterized in that: The tool retracting shaft is provided with a tool retracting knob for manually rotating the tool retracting shaft.

10. An electric stapler, comprising a driving mechanism and a knife retracting mechanism, characterized in that: It comprises a mounting bracket and the knife retracting device according to any one of claims 1 to 9, wherein the knife retracting device is mounted via the mounting bracket, the transmission gear of the knife retracting device is connected to the driving mechanism, and the knife retracting gear of the knife retracting device is connected to the knife retracting mechanism.

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