Manual reset device for electric anastomat

Abstract

The present application relates to a manual reset device for electric anastomat, comprising a body, a rack, a transmission gear, a driving mechanism and a reset mechanism, the reset mechanism comprises a gear shaft, a reset gear ratchet part, an elastic part, a cam part and a reset hand lever, the transmission gear is respectively abutted on the reset hand lever and the elastic part along the axial direction, the reset gear ratchet part is arranged between the reset hand lever and the cam part, the other end of the elastic part is abutted on the body, a pawl is arranged on the reset hand lever, the reset gear ratchet part comprises a cam part matched with the cam part, a gear part matched with the rack and a ratchet part matched with the pawl, the ratchet part is configured in a way that can rotate in one direction relative to the pawl, the gear part is arranged between the cam part and the ratchet part, a elastic element for abutting the pawl on the ratchet part is arranged on the reset hand lever. The present application has the advantages of simple structure and convenient operation.

Description

Technical Field

[0001] This invention relates to a manual reset device for an electric stapler. Background Technology

[0002] A surgical stapler is a commonly used medical device in surgical procedures. It can replace manual suturing, allowing for wound anastomosis and tissue cutting simply by operating the stapler. Therefore, it is widely used in open or minimally invasive general surgery, thoracic surgery, and pediatric surgery. An electric stapler is a device with its own motor drive, automating some of the actions during stapler operation. An electric stapler generally includes a motor, multi-stage gears, and a rack. The multi-stage gears are connected to the motor. After the motor starts, the multi-stage gears are driven, causing the rack connected to its upper gear to move linearly. The rack is connected to a mandrel, and the linear movement of the rack pushes the mandrel. The mandrel further pushes the cutting blade into the staple cartridge assembly, causing the staples to be ejected from the staple cartridge assembly and shaped by the staple forming component, thus completing the automatic cutting and suturing operation.

[0003] In the use of traditional electric staplers, when the power supply fails or malfunctions, the cutting blade may be unable to return after advancing. If the cutting blade cannot be retracted in time, it may prevent the next step of the surgical procedure from being completed, which may have a negative impact on the surgery. Chinese utility model patent CN217488732U, entitled "A Manual Retraction Device for an Electric Laparoscopic Anastomotic Device," discloses a manual retraction device for an electric laparoscopic anastomotic device, comprising: a body and a retraction mechanism. The body includes a drive assembly disposed within the electric laparoscopic anastomotic device and a housing mounted on the drive assembly. The retraction mechanism is installed within the housing and includes a reset pin mounted horizontally on the housing, a forced reset pin mounted on the reset pin, a reset handle fitted onto the reset pin and located on the side of the forced reset pin, a limiting post fixed to the reset handle, a retraction rod sleeved on the limiting post, a rack passing through the housing and located below the retraction rod, manual retraction teeth formed on the rack, and a forced reset button disposed outside the reset handle. The manual retraction device in this patent, while capable of retraction when the electric function of the electric laparoscopic stapler fails, requires a forced repositioning of the pressure plate before retraction, making the operation rather cumbersome. Furthermore, this type of retraction device is positioned above the stapler during use, making operation inconvenient and prone to wobbling, which can affect the surgery. Moreover, traditional manual retraction devices cannot be reused after use, requiring complete disassembly and reassembly for subsequent maintenance, which is relatively troublesome.

[0004] Based on the above issues, the applicant conducted research on these issues and thus this case came into being. Summary of the Invention

[0005] The purpose of this invention is to provide a simple and easy-to-operate manual reset device for an electric stapler.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A manual reset device for an electric stapler includes a body, a rack, a transmission gear that meshes with the rack, a drive mechanism for driving the transmission gear to rotate, and a reset mechanism for returning the rack to its original position. The reset mechanism includes a gear shaft mounted on the body, a reset gear ratchet assembly, an elastic element, a cam assembly that meshes with the reset gear ratchet assembly to guide its downward movement, and a reset lever. The transmission gear is rotatably mounted on the gear shaft and is axially movable along the gear shaft. The reset gear ratchet assembly is rotatably mounted on the gear shaft and is axially movable along the gear shaft. The reset lever is rotatably mounted on the gear shaft. The transmission gear is mounted on the gear shaft in a way that allows it to move axially. The two ends of the transmission gear abut against the reset lever and the elastic element, respectively. The reset gear ratchet is located between the reset lever and the cam. The other end of the elastic element abuts against the machine body. The reset lever is provided with a pawl. The reset gear ratchet includes a cam part that cooperates with the cam, a gear part that cooperates with the rack, and a ratchet part that cooperates with the pawl. The ratchet part is configured to rotate unidirectionally relative to the pawl. The gear part is located between the cam part and the ratchet part. The reset lever is provided with an elastic element for the pawl to abut against the ratchet part.

[0007] In a preferred embodiment of the present invention, the cam portion is provided with a guide slope and the cam component is provided with a guide groove, so that when the cam portion rotates, it can drive the cam portion to move axially along the gear shaft.

[0008] In a preferred embodiment of the present invention, the gear shaft is provided with a receiving hole, and an elastic pin that can extend into and out of the receiving hole is provided in the receiving hole. A limiting step that cooperates with the elastic pin to limit the movement of the reset gear ratchet relative to the cam is provided on the guide slope.

[0009] In a preferred embodiment of the present invention, the elastic pin includes an elastic body and a pin body, wherein the end of the pin body forms a spherical guide portion.

[0010] In a preferred embodiment of the present invention, the elastic element is a spring.

[0011] In a preferred embodiment of the present invention, the transmission gear is provided with a slot, one end of the spring abuts against the slot, and the other end abuts against the machine body.

[0012] In a preferred embodiment of the present invention, the elastic element is a spring sheet, a mounting seat is provided on the reset lever, the spring sheet is disposed on the mounting seat, and the elastic free end of the spring sheet abuts against the pawl.

[0013] In a preferred embodiment of the present invention, the cam portion, the gear portion, and the ratchet portion are integrally formed.

[0014] In a preferred embodiment of the present invention, the drive mechanism includes a motor and an input gear disposed on the output shaft of the motor.

[0015] In a preferred embodiment of the present invention, the cam is mounted on the machine body in a manner that prevents it from rotating relative to the machine body.

[0016] Using the technical solution of this invention, when the reset lever is rotated in a certain direction, the pawl can drive the reset gear ratchet component to rotate. Under the action of the cam component, the reset gear ratchet component moves axially along the gear shaft. The reset lever moves axially accordingly and presses against the transmission gear. The transmission gear compresses the elastic element and moves on the gear shaft. The transmission gear disengages from the rack, and the gear part of the reset gear ratchet component meshes with the gear. Rotating the reset lever again causes the gear part to interact with the rack, driving the rack to move, thereby realizing the retraction of the cutting blade connected to the rack. In this invention, manual blade retraction can be achieved simply by rotating the reset lever, which has the advantage of simple structure. Preferably, this invention provides an elastic pin on the gear shaft. When the reset gear ratchet component moves to a certain position, the elastic pin can restrict the reset gear ratchet component to return to its original position, allowing for smoother rotation of the reset lever. After manual reset, only the reset gear ratchet component needs to be adjusted with specific tooling to reset the manual reset device back to its original position, without requiring complete disassembly of the product. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of the electric stapler in this invention.

[0018] Figure 2 This is an exploded view of the manual reset device in this invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the electric stapler in this invention.

[0020] Figure 4 This is a schematic diagram of the electric stapler in the retracted state in this invention.

[0021] Figure 5 This is a schematic diagram of the electric stapler in the reverse rotation state of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the reset gear ratchet component and the reset lever in this invention.

[0023] Figure 7 This is a schematic diagram of another state of the reset gear ratchet component and the reset lever in this invention.

[0024] In the picture: Motor 10 Input gear 11 20 racks, 30 gear shafts Storage hole 31, spring pin 32 Transmission gear 40, elastic element 50 Reset lever 60, pawl 61 Elastic element 62, reset gear ratchet component 70 Cam section 71 Gear section 72 Ratchet 73 Limiting step 74 Cam part 80, cover body 90 Body 100 Detailed Implementation

[0025] To better understand the technical solution of the present invention, a more detailed description is provided below with reference to the embodiments.

[0026] Reference Figures 1 to 7 A manual reset device for an electric stapler includes a body 100, a rack 20, a transmission gear 40 that meshes with the rack 20, a drive mechanism for driving the transmission gear 40 to rotate, and a reset mechanism for returning the rack 20 to its original position. In a preferred embodiment, the drive mechanism includes a motor 10 and an input gear 11 mounted on the output shaft of the motor 10. These features are already described in the prior art. During normal operation, the drive mechanism drives the transmission gear 40, which in turn drives the rack 20 to move. The rack 20 is connected to the cutting blade, thereby causing the cutting blade to reciprocate.

[0027] by Figure 3The state of the present invention is described in the following description. In the present invention, a corresponding installation space can be provided on the body 100, and the reset mechanism is set in the installation space. The installation space is covered by a cover 90, and the cover 90 is opened when a reset operation is required. In the present invention, the reset mechanism includes a gear shaft 30, a reset gear ratchet 70, an elastic element 50, a cam 80 that cooperates with the reset gear ratchet 70 to guide the reset gear ratchet 70 to move downward, and a reset lever 60, all mounted on the body 100. The gear shaft 30 is mounted vertically on the body 100. The transmission gear 40 is rotatably mounted on the gear shaft 30 and can move axially along the gear shaft 30. The reset gear ratchet 70 is rotatably mounted on the gear shaft 30 and can move axially along the gear shaft 30. The reset lever 60 is rotatably mounted on the gear shaft 30. The transmission gear 40 is axially movable and sleeved on the gear shaft 30. The two ends of the transmission gear 40 abut against the reset lever 60 and the elastic element 50 respectively. The reset gear ratchet element 70 is disposed between the reset lever 60 and the cam element 80. The other end of the elastic element 50 abuts against the machine body 100. In a preferred embodiment of the present invention, the elastic element 50 is a spring, which is sleeved on the gear shaft 30. In a preferred embodiment of the present invention, the transmission gear 40 is provided with a slot, one end of the spring abuts against the slot, and the other end abuts against the machine body 100. A pawl 61 is provided on the reset lever 60, and the pawl 61 is rotatably mounted on the reset lever 60. The reset gear ratchet component 70 includes a cam portion 71 that engages with the cam component 80, a gear portion 72 that engages with the rack 20, and a ratchet portion 73 that engages with the pawl 61. The gear portion 72 is disposed between the cam portion 71 and the ratchet portion 73, and the cam portion 71, the gear portion 72, and the ratchet portion 73 are integrally formed. The ratchet portion 73 is configured to rotate unidirectionally relative to the pawl 61. When the reset lever 60 rotates in a certain horizontal direction, the pawl 61 can drive the ratchet portion 73 to rotate. When the reset lever 60 rotates in the other direction, the pawl 61 can slide over the ratchet portion 73 and cannot drive the ratchet portion 73 to rotate. The reset lever 60 is provided with a spring element 62 for causing the pawl 61 to abut against the ratchet portion 73. In an embodiment, as a preferred embodiment of the present invention, the spring element 62 is a spring sheet. The reset lever 60 is provided with a mounting base, the spring sheet is disposed on the mounting base, and the elastic free end of the spring sheet abuts against the pawl 61, thereby causing the pawl 61 to abut against the ratchet portion 73 with a certain elastic force. The present invention can provide a groove on the pawl 61, into which the spring sheet is embedded.

[0028] In a preferred embodiment of the present invention, the cam portion 71 is provided with a guide slope, and the cam member 80 is provided with a guide groove, so that when the cam portion 71 rotates, it can drive the cam portion 71 to move axially along the gear shaft 30. The guide slope can be, for example, a helical slope, and the guide groove can be a helical groove. The cam member 80 is mounted on the machine body and does not rotate. The cam portion 71 is embedded in the guide groove. When the cam portion 71 rotates, the entire reset gear ratchet member 70 will move downward along the gear shaft 30 axially.

[0029] In a preferred embodiment of the present invention, the gear shaft 30 is provided with a receiving hole 31, which is arranged radially along the gear shaft 30. An elastic pin 32, which can extend into and out of the receiving hole 31, is provided in the receiving hole 31. A limiting step 74, which cooperates with the elastic pin 32 to restrict the movement of the reset gear ratchet 70 relative to the cam 80, is provided on the guide slope. In a preferred embodiment of the present invention, the elastic pin 32 includes an elastic body and a pin body, with the end of the pin body forming a spherical guide portion. When the anastomosis device is working normally, the pin body compresses the elastic body and retracts into the receiving hole 31, located within the shaft hole of the reset gear ratchet 70.

[0030] In this invention, when the stapler is working normally, the motor 10 drives the input gear 11 to rotate, and the input gear 11 drives the transmission gear 40 to mesh. The transmission gear 40 is limited by the elastic element 50 and the reset lever 60. When the stapler's anvil and staple cartridge assembly are closed, pressing the power switch button causes the motor 10 to drive the transmission gear 40 through the input gear 11. The transmission gear 40 meshes and drives the rack 20 to move. The rack 20 is connected to the cutting blade, thereby driving the cutting blade to reciprocate.

[0031] When the electric stapler encounters a power failure or malfunction, the cutting blade may be unable to return after advancing. In such cases, manual retraction is required. The working principle of manual retraction is as follows: the reset gear ratchet 70 and the cam 80 work together. When the reset gear ratchet 70 rotates, it can only move downwards while rotating.

[0032] The pawl 61 is rotatably mounted on the reset lever 60. Under the pressure of the elastic element 62, the pawl 61 engages with the ratchet portion 73 of the reset gear ratchet assembly 70, forming a unidirectional ratchet-pawl structure. Forward rotation drives the ratchet portion 73 to rotate, while reverse rotation disengages it from the ratchet portion 73, preventing it from rotating. When the reset lever 60 is rotated forward, the pawl 61 rotates along with it, and the pawl 61, through its unidirectional structure, pushes the reset gear ratchet assembly 70 to rotate in the same direction. The reset gear ratchet assembly 70 then transmits movement in two directions: firstly, through the cooperation of the cam element 80, it rotates and moves downwards, simultaneously driving the reset lever 60 and the transmission gear 40 downwards. The transmission gear 40 disengages from the rack 20, and the gear portion 72 on the reset gear ratchet assembly 70 engages with the rack 20; secondly, its own rotation drives the rack 20 to move backwards, causing the cutting blade connected to the rack 20 to return to its original position. After the reset gear ratchet 70 rotates and moves downward a certain distance, it will disengage from the cam 80 and stop moving downward. At the same time, the elastic pin 32 on the gear shaft 30 pops out and gets stuck on the limit step 74. The reset gear ratchet cannot move upward and can only rotate to retract the rack 20.

[0033] The scope of protection of this invention is not limited to this embodiment. Any similar modifications made to it are considered to be within the scope of protection of this invention.

Claims

1. A manual reset device for an electric stapler, comprising a body, a rack, a transmission gear meshing with the rack, a drive mechanism for driving the transmission gear to rotate, and a reset mechanism for returning the rack to its original position, characterized in that: The reset mechanism includes a gear shaft mounted on the machine body, a reset gear ratchet assembly, an elastic element, a cam assembly that cooperates with the reset gear ratchet assembly to guide its downward movement, and a reset lever. A transmission gear is rotatably mounted on the gear shaft and can move axially along the gear shaft. The reset gear ratchet assembly is rotatably mounted on the gear shaft and can move axially along the gear shaft. The reset lever is rotatably mounted on the gear shaft and can move axially along the gear shaft. The two ends of the transmission gear abut against the reset lever and the elastic element, respectively. The reset gear ratchet assembly is positioned between the reset lever and the cam assembly. The other end of the elastic element abuts against the machine body. A pawl is provided on the reset lever. The reset gear ratchet assembly includes a cam portion that cooperates with the cam assembly, a gear portion that cooperates with the rack, and a ratchet portion that cooperates with the pawl. The ratchet portion is configured to rotate unidirectionally relative to the pawl. The gear portion is positioned between the cam portion and the ratchet portion. A spring element is provided on the reset lever to cause the pawl to abut against the ratchet portion.

2. The manual reset device for an electric stapler as described in claim 1, characterized in that: The cam portion is provided with a guide slope, and the cam component is provided with a guide groove, so that when the cam portion rotates, it can drive the cam portion to move axially along the gear shaft.

3. The manual reset device for an electric stapler as described in claim 2, characterized in that: The gear shaft is provided with a receiving hole, and an elastic pin that can extend into and out of the receiving hole is provided in the receiving hole. A limiting step that cooperates with the elastic pin to limit the movement of the reset gear ratchet relative to the cam is provided on the guide slope.

4. The manual reset device for an electric stapler as described in claim 3, characterized in that: The elastic pin includes an elastic body and a pin body, with the end of the pin body forming a spherical guide portion.

5. The manual reset device for an electric stapler as described in claim 4, characterized in that: The elastic element is a spring.

6. The manual reset device for an electric stapler as described in claim 5, characterized in that: The transmission gear is provided with a slot, one end of the spring abuts against the slot, and the other end abuts against the machine body.

7. The manual reset device for an electric stapler as described in claim 6, characterized in that: The elastic element is a spring sheet, and a mounting base is provided on the reset lever. The spring sheet is mounted on the mounting base, and the elastic free end of the spring sheet abuts against the pawl.

8. The manual reset device for an electric stapler as described in claim 7, characterized in that: The cam portion, the gear portion, and the ratchet portion are integrally formed.

9. The manual reset device for an electric stapler as described in claim 8, characterized in that: The drive mechanism includes a motor and an input gear mounted on the output shaft of the motor.

10. The manual reset device for an electric stapler as described in claim 9, characterized in that: The cam component is mounted on the machine body in a manner that prevents it from rotating relative to the machine body.

Images