Cutting stapler and adjustment device for cutting stapler

Abstract

This application relates to a cutting stapler and an adjustment device for the cutting stapler. The cutting stapler (10) includes a stapler body (100) and an actuation assembly (200). The stapler body is provided with an inner frame assembly (110), on which are mounted: a motor (120); a gear-rack transmission mechanism; a printed circuit board assembly (130) disposed on the upper part of the inner frame assembly (110), on which the circuitry for the motor is integrated; and an adjustable resistor module (140B) connected to the circuitry of the motor for adjusting the current supplied to the motor. The resistance value of the adjustable resistor module (140B) is adjusted such that the maximum striking force output by the cutting stapler (10) does not exceed a predetermined maximum striking force threshold or threshold range. The adjustable resistor module is disposed on the lower surface of the printed circuit board assembly, near the lateral edge of the printed circuit board assembly, and facing the outer side of the inner frame assembly.

Description

Technical Field

[0001] This application relates to a cutting stapler and an adjustment device for the cutting stapler. Background Technology

[0002] Anastomosing devices are widely used in various minimally invasive surgeries, such as for tissue resection, transection, and anastomosis in open surgeries in abdominal, gynecological, pediatric, and thoracic surgery. An anastomosing device mainly consists of an actuator component for performing resection, transection, and anastomosis, and a stapler body for operating the actuator component to perform various functions. The actuator component includes a staple cartridge assembly for anastomosing tissue. The distal end of the stapler body engages with the actuator component, while the proximal end of the stapler body has a handle, motor, control unit, etc. The stapler body is sometimes also referred to as the operating component. The striking force generated at the motor in the stapler body is transmitted to the actuator component.

[0003] However, the striking force of the cutting stapler must not be too high. Excessive striking force will cause the following problems.

[0004] First, when the firing force is too great, the staple cartridge assembly will be damaged when it is fired, resulting in component damage such as breakage of the anti-expansion plate or the cutting blade, and the cutting blade will be unable to be withdrawn, causing injury to the patient.

[0005] Secondly, for example, in obese patients with extremely thick tissue or areas of high resistance such as those containing stones, the theoretically required striking force would be significantly increased. However, even with increased striking force, in practice, the problem of "cutting but not nailing" can occur in extremely thick tissue or areas of high resistance, making it impossible to suture the severed tissue, leading to bleeding and increasing clinical risks. To avoid this problem, the cutting stapler should be avoided from firing in such areas of extremely thick tissue or high resistance. When the maximum striking force of the cutting stapler is limited and less than the theoretically required striking force for extremely thick tissue or areas of high resistance, the cutting stapler will not fire in these areas and will automatically stop.

[0006] Given the above issues, it is necessary to limit the maximum firing force of the cutting stapler.

[0007] For manual cutting staplers, the maximum firing force is currently limited primarily through mechanical structures. When the firing force of the cutting stapler is too high, it can cause the teeth on the drive rack to break or the components to slip, thereby limiting the input of the maximum firing force.

[0008] However, for electrically powered cutting staplers, there is also a need for technology that can reliably limit the maximum firing force. Summary of the Invention

[0009] According to a first aspect of this application, a cutting anastomosis device is provided, the cutting anastomosis device comprising an anastomosis device body and an actuation assembly attached to the anastomosis device body, characterized in that the anastomosis device body is provided with an inner frame assembly housed within a housing of the anastomosis device body, and a motor is mounted on the inner frame assembly, the motor being supplied with current and driven to output torque, the torque being transmitted to a firing lever of the cutting anastomosis device via a gear-rack transmission mechanism to generate a firing force of the cutting anastomosis device; the gear-rack transmission mechanism includes a first bevel gear coaxially mounted with and rotating with the output end of the motor, a second bevel gear mounted perpendicularly to and meshing with the first bevel gear, and a gear coaxially mounted with and rotating with the second bevel gear. The device comprises a rotating spur gear and a rack meshing with the spur gear and connected to the firing lever; a printed circuit board assembly disposed on the upper part of the inner frame assembly, on which the circuitry for the motor is integrated; and an adjustable resistor module connected in the motor circuitry for adjusting the current supplied to the motor. The resistance value of the adjustable resistor module is adjusted such that the maximum firing force output by the cutting stapler does not exceed a predetermined maximum firing force threshold or threshold range. The adjustable resistor module is disposed on the lower surface of the printed circuit board assembly, near the lateral edge of the printed circuit board assembly, and facing the outer side of the inner frame assembly. The lateral direction of the printed circuit board assembly is substantially perpendicular to the direction along which the firing lever extends. By employing an adjustable resistor module to calibrate the maximum firing force of each cutting stapler, this application achieves precise and stable control of the maximum firing force of the cutting stapler solely through electromechanical control. Furthermore, it can prevent damage to the staple cartridge assembly of the cutting stapler upon firing, thus avoiding injury to the patient. It also avoids the cutting stapler firing on extremely thick tissue or areas of high resistance, thus preventing bleeding caused by the inability to suture after cutting and severing tissue.

[0010] According to a preferred embodiment, the motor circuit also includes a motor driver chip for detecting and controlling the current supplied to the motor. For example, the motor driver chip may be a brushed motor driver chip.

[0011] According to a preferred embodiment, the motor drive chip is disposed on the lower surface of the printed circuit board assembly. This avoids damage to various functional components that protrude relative to the surface of the printed circuit board assembly. Furthermore, it saves mounting space for these functional components.

[0012] According to a preferred embodiment, the adjustable resistor module is connected in series with the motor driver chip. One end of the adjustable resistor module is electrically connected to the current limiting terminal of the motor driver chip, and the other end of the adjustable resistor module is grounded. This connection scheme has low power consumption and is used to change the current judgment threshold of the motor driver chip, thereby changing the current value supplied to the motor.

[0013] According to a preferred embodiment, the adjustable resistor module is connected in series with the motor. One end of the adjustable resistor module is electrically connected to the motor, and the other end is electrically connected to the motor driver chip. This connection scheme does not change the current judgment threshold of the motor driver chip, but changes the voltage applied to the motor, thereby changing the current value supplied to the motor.

[0014] According to a preferred embodiment, the firing force of the cutting stapler is determined by measuring the force transmitted to a rack mounted in the inner frame assembly. This is very convenient when adjusting using an adjustment device.

[0015] According to a preferred embodiment, the adjustable resistor module includes one or more resistors. The number of resistors can be selected as needed, and the adjustable resistor module can be configured with the desired resistance change rate and the desired resistance adjustment range.

[0016] According to a preferred embodiment, the adjustable resistor module is provided with a resistance adjustment section for assisting in adjusting the resistance value. For example, the resistance adjustment section may be a recess into which an adjustment tool, such as a screwdriver, is inserted.

[0017] According to a preferred embodiment, the resistance adjustment section of the adjustable resistor module faces the outer side of the inner frame assembly. This facilitates the adjustment of the resistance value of the adjustable resistor module by the operator.

[0018] According to a second aspect of this application, an adjustment device for a cutting stapler is provided, the cutting stapler being the cutting stapler described in the foregoing aspect, characterized in that the adjustment device is used to adjust the resistance value of an adjustable resistor module in the inner frame assembly of the cutting stapler, the adjustment device comprising: a base on which the inner frame assembly of the cutting stapler to be adjusted is placed; a cover, the cover being openable and closable relative to the base for clamping the inner frame assembly to be adjusted between the base and the cover; a plunger configured to operably contact a rack of the inner frame assembly of the cutting stapler and to be movable back and forth along the rack under the action of the rack; a retractable elastic member, one end of the elastic member being operably in contact with the plunger and the other end of the elastic member being connected to a pressure sensor, the plunger being located between the rack and the elastic member; and a pressure sensor for measuring the magnitude of the force on the rack, adjusting the resistance value of the adjustable resistor module according to the magnitude of the force value displayed by the pressure sensor until the force value displayed by the pressure sensor is equal to a predetermined maximum firing force threshold or threshold range of the cutting stapler. The adjustment device of this application is simple to operate, requires no measurement or calculation of the current value that should be supplied to the motor, and can precisely adjust the maximum striking force of the cutting stapler.

[0019] According to a preferred embodiment, the elastic member is a compression spring. The compression spring acts as a buffer, reducing the impact of rack movement and facilitating motor starting. Simultaneously, the compression spring does not adversely affect the measurement of rack force.

[0020] Other features of this application will become apparent from the accompanying drawings and from the following description of exemplary embodiments. Attached Figure Description

[0021] The present application will now be described in detail below with reference to the accompanying drawings. It should be understood that the drawings are not necessarily drawn to scale; furthermore, for ease of illustration, components shown in one drawing may be omitted in other views. The drawings are for illustrating exemplary embodiments of the present application only and should not be considered as limiting the scope of the present application. In the drawings:

[0022] Figure 1 This is a perspective view schematically illustrating the overall structure of a cutting stapler according to an exemplary embodiment of this application;

[0023] Figure 2 This is a schematic exploded perspective view of the stapler body of the cutting stapler;

[0024] Figure 3 This is a schematic diagram showing the gear-rack transmission mechanism with parts of the outer shell and internal structure removed from the main body of the cutting anastomosis device to more clearly illustrate the mechanism.

[0025] Figure 4 It is a graph that schematically shows the characteristic curves of a motor;

[0026] Figure 5 This is a perspective view schematically showing the inner frame assembly and resistor module of the anastomosis device body;

[0027] Figure 6 This is a schematic perspective view of a printed circuit board assembly viewed from an obliquely upward perspective according to another embodiment;

[0028] Figure 7 This is a schematic perspective view of the printed circuit board assembly viewed from a slightly below-the-bottom angle;

[0029] Figure 8 This is another schematic perspective view of the printed circuit board assembly viewed from different angles below;

[0030] Figure 9 This is a block diagram schematically showing the installation of an adjustable resistor module in the current.

[0031] Figure 10 This is another block diagram schematically illustrating the installation of the adjustable resistor module in the current;

[0032] Figure 11 This is a block diagram schematically illustrating the inventive concept employing an adjustable resistor module;

[0033] Figure 12 This is a perspective view schematically showing an adjustment device for adjusting the resistance value of an adjustable resistor module;

[0034] Figure 13 It is a schematic perspective view of the regulating device after the cover has been removed; and

[0035] Figure 14 It is a schematic cross-sectional view of the regulating equipment.

[0036] List of reference numerals

[0037] 10 – Anastomosis cutter; 100 – Anastomosis cutter body; 200 – Execution component.

[0038] 101 – First housing half; 102 – Second housing half; 103 – First knob assembly

[0039] 104 - Second knob assembly; 105 - Battery pack; 106 - Firing lever

[0040] 110 - Inner frame component; 111 - Firing button; 112 - Retract button

[0041] 120 — Motor; 121 — Output terminal; 122 — First bevel gear

[0042] 123 — Second bevel gear; 124 — Spur gear; 125 — Rack

[0043] 130 – Printed Circuit Board Assembly; 131 – Upper Surface; 132 – Lower Surface

[0044] 140A – Resistor Module; 140B – Adjustable Resistor Module; 141 – Resistor Adjustment Section

[0045] 150 — Motor drive chip; 30 — Adjustment device; 31 — Base

[0046] 32 - Cap; 33 - Sleeve; 34 - Plunger

[0047] 35—Elastic component; 36—Pressure sensor Detailed Implementation

[0048] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. However, it should be understood that the descriptions of various embodiments are merely illustrative and not intended to limit the technology of this application. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0049] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. In the drawings, for clarity, the dimensions of some parts may be distorted, enlarged, or reduced; or some parts may be omitted or shown in simplified form to highlight certain parts.

[0050] Unless otherwise specified, all terms used in this specification have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, well-known functions or structures, or those unrelated to the inventive points of this application, are not described in detail.

[0051] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in the specification may include plural forms. The terms “comprising,” “including,” and “containing” used in the specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in the specification includes any and all combinations of one or more of the relevant listed items.

[0052] When a specification states that a component is located "on," "attached" to, "connected" to, or "in contact" with another component, the component may be directly located on, directly attached to, directly connected to, or directly in contact with the other component, or there may be an intermediate component. This limitation applies to similar wording.

[0053] In the instruction manual, the terms "first," "second," and "third" are used only to distinguish the various components and are not intended to limit the order or function of the components. Furthermore, "second" or "third" components may be specified even if a component designated as "first" or "third" is not included or is used as a subsequent component.

[0054] In the instructions, "proximal" refers to the side closer to the operator (e.g., a surgeon) of the cutting stapler 10, while "distal" refers to the side further away from the operator (i.e., closer to the patient).

[0055] In this instruction manual, unless otherwise stated, terms such as "left," "right," "up," "down," "outer," and "inner" refer to directions as shown in the figures. It should be understood that spatial relation terms such as "left," "right," "up," "down," "outer," and "inner" are intended to describe the relationship between one feature and another in the figures. It should be understood that spatial relation terms include not only the orientations shown in the figures but also the different orientations of the cutting stapler 10 and the adjusting device 30 during use or operation.

[0056] <First Embodiment>

[0057] Below, we will refer to Figure 1 The basic structure of a cutting stapler 10 according to a first exemplary embodiment of this application will be described using an electric cutting stapler as an example. The cutting stapler 10 mainly includes a stapler body 100 equipped with various components such as a motor, a gear-rack transmission mechanism, and a printed circuit board, and an actuation assembly 200 that can be detachably attached to the stapler body 100. The actuation assembly 200 is used to perform various operations such as cutting and anastomosis by receiving a firing force from a firing lever 106 (described below). The actuation assembly 200 can be of different types. The same stapler body 100 can be used with multiple different types of actuation assemblies 200.

[0058] Figure 2 An exploded perspective view of the stapler body 100 is shown. The stapler body 100 includes a first housing half 101, a second housing half 102, a first knob assembly 103, a second knob assembly 104, and a battery pack 105, which together constitute the outer shell of the stapler body 100. An inner frame assembly 110 is housed within the outer shell of the stapler body 100. The inner frame assembly 110 is the core component of the stapler body 100, on which a motor 120, a rack and pinion drive mechanism, a printed circuit board assembly (PCBA) 130, etc., are assembled, and these components will be described in detail later. Furthermore, a firing lever 106 is also connected to a rack 125 assembled in the inner frame assembly 110.

[0059] Figure 3An exemplary embodiment of the gear-rack drive mechanism of the cutting stapler 10 is shown. A motor 120 is used to generate the firing force for firing the cutting stapler 10. Specifically, the motor 120 rotates by supplying current to it via a circuit, thereby generating torque. The output torque of the motor 120 is transmitted to the firing lever 106 via the gear-rack drive mechanism. Figure 3 Only a portion of the firing lever 106 is visible; the rest is hidden. The gear-rack mechanism includes a gear set and a rack. In an exemplary embodiment, the gear-rack mechanism includes a first bevel gear 122 mounted coaxially with and rotating with the output end 121 of the motor 120; a second bevel gear 123 mounted perpendicularly to and meshing with the first bevel gear 122; a spur gear 124 mounted coaxially with and rotating with the second bevel gear 123; and a rack 125 meshing with the spur gear 124 and connected to the firing lever 106. This gear-rack mechanism, including bevel gears and a rack, allows for changing the transmission direction of the motor's output torque and makes the transmission mechanism more compact and space-saving. Here, the motor 120 can be a brushed motor. However, other types of motors are also feasible.

[0060] according to Figure 4 The motor characteristic curves shown indicate a positive correlation between the torque of motor 120 and the current supplied to it. The output torque of motor 120 can be calculated based on the striking force required by the anastomosis cutting device, and the required current to be supplied to motor 120 can be calculated based on this calculated output torque. To limit the maximum striking force of the anastomosis cutting device 10, the inventors envision incorporating a resistor module 140A in the circuit of motor 120 to limit the maximum current supplied to it. The resistance value of the resistor module 140A can be pre-calculated based on the total current supplied to the anastomosis cutting device 10 and the maximum current that can be diverted to motor 120. For anastomosis cutting devices of the same specifications, both the motor and the resistor module with the aforementioned fixed resistance value are commercially available standard components, and their structures are well-known in the art and will not be described further here. After the motor and fixed-value resistor module are assembled into an anastomosis cutting device according to standard procedures, it can be sold commercially.

[0061] The following describes the structure related to the arrangement of resistor module 140A.

[0062] Figure 5The inner frame assembly 110 of the stapler body 100 is schematically shown. A printed circuit board assembly 130 is mounted on the upper part of the inner frame assembly 110. Various circuit structures, chips, etc., of the stapler can be integrated on the printed circuit board assembly 130. Circuitry for controlling the motor 120 is also integrated on the printed circuit board assembly 130. A resistor module 140A for regulating the current supplied to the motor 120 is mounted on the printed circuit board assembly 130. Figure 5 In the example shown, resistor module 140A is mounted on the lower surface of printed circuit board assembly 130. However, the mounting location of resistor module 140A on printed circuit board assembly 130 is not particularly limited.

[0063] The first embodiment uses a fixed-value resistor to limit the maximum current supplied to the motor of the cutting stapler, thereby limiting the maximum firing force of the cutting stapler. This maximum firing force limiting scheme is applicable not only to electric cutting staplers but also to manual cutting staplers.

[0064] <Second Embodiment>

[0065] The inventors discovered that even with a fixed resistor in the motor's circuitry, there are still times when the maximum striking force of the cutting stapler may be too high, making it impossible to precisely control the maximum striking force.

[0066] Further research by the inventors revealed that the excessive striking force was mainly due to the following errors: manufacturing errors of parts, instability of process materials, errors of the motor itself (according to data provided by the supplier, the error of a typical motor can reach 20%), errors of the PCBA (i.e., printed circuit board assembly), transmission efficiency of the transmission system including gears, and errors of the cutting and merging device system itself.

[0067] To more precisely control the maximum firing force of the cutting stapler, as a further improvement to the first embodiment, the inventors envision incorporating an adjustable resistor module 140B into the motor's circuit structure, such as... Figure 11As shown. After assembling the inner frame assembly 110 of the stapler body, the maximum striking force that the stapler can generate at this time is measured. If the measured maximum striking force is inconsistent with the predetermined maximum striking force threshold or threshold range required, the resistance value of the adjustable resistor module 140B is adjusted, thereby adjusting the current supplied to the motor 120, the output torque of the motor, and the striking force of the stapler, until the maximum striking force that the stapler can generate is adjusted to the predetermined maximum striking force threshold or threshold range. This solution takes into account all errors of the stapler, including component manufacturing errors, process material stability, motor errors, PCBA errors, transmission system efficiency, and system errors, but does not focus on solving these errors or calculating the current that needs to be supplied to the motor. Instead, it directly adjusts the resistance value of the front end based on the output striking force at the end. Thus, the maximum striking force of the stapler can be precisely and stably limited.

[0068] The arrangement and adjustment process of the adjustable resistor module 140B will be described in detail below. Note that structures identical to those in the first embodiment will be indicated by the same reference numerals and will not be described again. The following description will focus on further improvements compared to the first embodiment.

[0069] Figure 6 , Figure 7 , Figure 8 The printed circuit board assembly 130 is shown from different angles. It can be seen that the upper surface 131 of the printed circuit board assembly 130 is substantially smooth. Various circuit structures, chips, and other functional components are mainly integrated on the lower surface 132 of the printed circuit board assembly 130. This avoids damage to various functional components protruding relative to the surface of the printed circuit board assembly 130. Furthermore, it saves mounting space for these functional components.

[0070] An adjustable resistor module 140B for regulating the current supplied to the motor 120 is mounted on the lower surface 132 of the printed circuit board assembly 130. The adjustable resistor module 140B can be arranged near the end of the printed circuit board assembly 130 in the longitudinal direction (i.e., the direction along the long side of the printed circuit board assembly 130, or the direction along which the firing lever 106 extends). Furthermore, the adjustable resistor module 140B can be arranged near the edge of the printed circuit board assembly 130 in the lateral direction (i.e., the direction along the short side of the printed circuit board assembly 130, or the direction substantially perpendicular to the direction along which the firing lever 106 extends), whereby the adjustable resistor module 140B faces the outer side of the inner frame assembly 110 for easy access. The adjustable resistor module is a commercially available standard component, and its structure is well known in the art and will not be described further here. The adjustable resistor module 140B may include one or more resistors. The number of resistors can be selected as needed. The adjustable resistor module 140B can be configured to have a desired resistance change rate and a desired resistance adjustment range as needed.

[0071] The adjustable resistor module 140B may also be provided with a resistance adjustment section 141 for assisting in adjusting the resistance value. For example, the resistance adjustment section 141 may be a recess. An adjustment tool, such as a screwdriver, is inserted into the recess, and the resistance value of the adjustable resistor module 140B is adjusted by rotating the screwdriver.

[0072] The adjustable resistor module 140B is mounted on the upper part of the inner frame assembly 110, near the front left corner of the inner frame assembly 110. Furthermore, the resistance adjustment section 141 of the adjustable resistor module 140B faces outwards from the inner frame assembly 110, i.e., towards the operator. This facilitates adjustment of the resistance value of the adjustable resistor module 140B by the operator.

[0073] In addition, a motor driver chip 150 (see [reference]) is used to detect and control the current supplied to the motor. Figure 9 and Figure 10 It is also mounted on the lower surface 132 of the printed circuit board assembly 130. For example, the motor driver chip 150 can limit the current supplied to the motor 120 to 3A-5A. The motor driver chip 150 can be a brushed motor driver chip. The motor driver chip is a commercially available standard component, and its structure is well known in the art and will not be described in detail here.

[0074] Figure 9The diagram schematically illustrates a first connection scheme between the adjustable resistor module 140B and the motor driver chip 150 in a circuit used to control the motor 120. As shown, the adjustable resistor module 140B can be directly connected in series with the motor driver chip 150 to change the current judgment threshold of the motor driver chip 150, thereby changing the current value supplied to the motor. Specifically, one end of the adjustable resistor module 140B is electrically connected to the current limiting terminal ILIM of the motor driver chip 150, and the other end of the adjustable resistor module 140B is grounded.

[0075] Figure 10 A second connection scheme between the adjustable resistor module 140B and the motor driver chip 150 in a circuit for controlling the motor 120 is schematically shown. As shown, the adjustable resistor module 140B can also be directly connected in series with the motor 120. One end of the adjustable resistor module 140B is electrically connected to the motor 120, and the other end is electrically connected to the motor driver chip 150. The current limiting terminal ILIM of the motor driver chip 150 is grounded. This connection scheme does not change the current judgment threshold of the motor driver chip 150, but rather changes the voltage applied to the motor 120, thereby changing the current supplied to the motor. Compared to the first connection scheme, the second connection scheme consumes more power.

[0076] Notice, Figure 9 and Figure 10 Structures unrelated to the inventive points of this application (e.g., logic gate signals, etc.) will not be described further. Furthermore, only one exemplary embodiment of the motor driver chip 150 is shown in the figures; driver chips with other structures can also be used for motors.

[0077] Figure 12 , Figure 13 and Figure 14 A perspective or sectional view of the adjustment device 30 for adjusting the resistance value of the adjustable resistor module 140B is schematically shown. The rack 125 of the inner frame assembly 110 is directly connected to the firing lever 106. Therefore, the force transmitted from the motor 120 to the rack 125 can be considered to be substantially equal to the firing force transmitted to the firing lever 106. The firing force of the cutting stapler can be determined by measuring the force transmitted to the rack 125 of the inner frame assembly 110. That is, the inner frame assembly 110 can be used as the measurement object or calibration object of the adjustment device 30.

[0078] As shown in the figure, the adjusting device 30 includes a base 31 and a cover 32 that can be opened and closed relative to the base. The base 31 also has a plunger 34 disposed within a sleeve 33. The plunger 34 is configured to operably contact the rack 125 of the inner frame assembly 110 and to move back and forth within the sleeve 33 along the direction of the rack 125 under the action of the rack 125. A retractable elastic member 35 is also disposed within the sleeve 33. The plunger 34 is positioned between the rack 125 and the elastic member 35. One end of the elastic member 35 is operably in contact with the plunger 34, and the other end of the elastic member 35 is connected to a pressure sensor 36. The pressure sensor 36 is used to measure the magnitude of the force on the rack 125. Preferably, the elastic member 35 can be a compression spring. The elastic member 35 can provide sufficiently large resistance. An elastic member 35, such as a compression spring, can act as a buffer, reducing the impact of the rack 125's movement and facilitating motor starting. Meanwhile, the elastic member 35 will not adversely affect the measurement of rack force.

[0079] The adjustment process of the adjustment device 30 is described below.

[0080] First, place the assembled inner frame assembly 110 onto the base 31 of the adjustment device 30, aligning the rack 125 of the inner frame assembly 110 with the plunger 34 of the adjustment device 30, and then close the cover 32.

[0081] The second step is to connect the inner frame assembly 110 to the power supply, and then press and hold the firing button 111 on the inner frame assembly 110 to drive the rack 125 to move forward and contact the plunger 34 until the pressure sensor 36 displays the force value and the rack 125 stops, and the force value is read.

[0082] Third, press and hold the retraction button 112 on the inner frame component 110 to retract the rack 125 to a certain position.

[0083] Fourth, insert the adjustment tool into the resistance adjustment section 141 of the adjustable resistance module 140B, and rotate the adjustment tool clockwise or counterclockwise. For example, clockwise rotation will increase the value of the measured force, and counterclockwise rotation will decrease the value of the measured force.

[0084] Fifth, repeat steps two through four or three through four until the measured force value equals the predetermined maximum firing force threshold or threshold range.

[0085] Step 6: Open cover 32 and unload the adjusted inner frame component 110 to prepare for the next adjustment of the inner frame component 110.

[0086] In conclusion, as follows: Figure 11As shown, this embodiment adjusts the resistance value of the adjustable resistor module 140B in the circuit of the motor 120 based on the firing force (i.e., end output) of the cutting stapler 10, thereby calibrating the maximum firing force of the cutting stapler to a predetermined maximum firing force threshold or threshold range. The adjustment device 30 is simple to operate, requiring no measurement or calculation of the current value to be supplied to the motor 120, and can precisely adjust the maximum firing force of the cutting stapler. The calibrated maximum firing force of the cutting stapler 10 is stable and accurate. Furthermore, it can prevent damage to the stapler cartridge assembly when fired, thus avoiding injury to the patient. It can also prevent the cutting stapler from firing on extremely thick tissue or areas of high resistance, avoiding the problem of bleeding caused by the inability to suture after cutting and severing tissue.

[0087] This embodiment achieves precise and stable control of the maximum firing force of the cutting stapler 10 solely through electromechanical control, without employing software control, thus resulting in lower costs. In contrast, the approach of installing a sensor in the cutting stapler to monitor the firing force in real time and dynamically adjusting the firing force through a software system requires significant modifications to the existing cutting stapler structure and is also more expensive.

[0088] This maximum firing force limiting scheme using an adjustable resistor module is applicable not only to electric cutting staplers but also to manual cutting staplers.

[0089] The content described with reference to either the first embodiment or the second embodiment can be applied to another embodiment, as long as there is no conflict.

[0090] In addition, the following embodiments are also covered within the scope of this application and can serve as the basis for subsequent modifications.

[0091] <Example A>

[0092] A cutting stapler (10) includes a stapler body (100) and an execution assembly (200) attached to the stapler body (100), characterized in that the stapler body (100) is provided with an inner frame assembly (110), the inner frame assembly (110) being housed within a shell of the stapler body (100), and the following are mounted on the inner frame assembly (110):

[0093] The motor (120) is supplied with current and driven to output torque, which is transmitted via a gear-rack mechanism to the firing rod (106) of the cutting stapler (100) to generate the firing force of the cutting stapler;

[0094] A gear-rack transmission mechanism, comprising a gear set and a rack (125), wherein the rack (125) is connected to a firing lever (106);

[0095] A printed circuit board assembly (130) is arranged above the inner frame assembly (110), and circuitry for the motor (120) is integrated on the printed circuit board assembly (130); and

[0096] Resistor modules (140A, 140B) are connected in the circuit of the motor (120). The resistor modules ensure that the maximum firing force output by the cutting stapler (10) does not exceed a predetermined maximum firing force threshold or threshold range. The resistor modules (140A, 140B) are arranged on the lower surface (132) of the printed circuit board assembly (130). The resistor modules (140A, 140B) are arranged near the edge of the printed circuit board assembly (130) in the lateral direction and face the outside of the inner frame assembly (110). The lateral direction of the printed circuit board assembly (130) is substantially perpendicular to the direction along which the firing rod (106) extends.

[0097] <Example B>

[0098] A cutting stapler (10) includes a stapler body (100) and an execution assembly (200) attached to the stapler body (100), characterized in that the stapler body (100) is provided with an inner frame assembly (110), the inner frame assembly (110) being housed within a shell of the stapler body (100), and the following are mounted on the inner frame assembly (110):

[0099] The motor (120) is supplied with current and driven to output torque, which is transmitted to the firing rod (106) of the cutting stapler (100) to generate the firing force of the cutting stapler;

[0100] A printed circuit board assembly (130) is arranged above the inner frame assembly (110), and circuitry for the motor (120) is integrated on the printed circuit board assembly (130); and

[0101] An adjustable resistor module (140B) is connected in the circuit of the motor (120) to adjust the current supplied to the motor (120). The resistance value of the adjustable resistor module (140B) is adjusted so that the maximum firing force output by the cutting stapler (10) does not exceed a predetermined maximum firing force threshold or threshold range.

[0102] <Example C>

[0103] A cutting stapler (10) includes a stapler body (100) and an execution assembly (200) attached to the stapler body (100), characterized in that the stapler body (100) is provided with an inner frame assembly (110), the inner frame assembly (110) being housed within a shell of the stapler body (100), and the following are mounted on the inner frame assembly (110):

[0104] The motor (120) is supplied with current and driven to output torque, which is transmitted to the firing rod (106) of the cutting stapler (100) to generate the firing force of the cutting stapler;

[0105] A printed circuit board assembly (130) is arranged above the inner frame assembly (110), and circuitry for the motor (120) is integrated on the printed circuit board assembly (130); and

[0106] An adjustable resistor module (140B) is connected in the circuit of the motor (120) to regulate the current supplied to the motor (120). The resistance value of the adjustable resistor module (140B) is adjusted such that the maximum firing force output by the cutting stapler (10) does not exceed a predetermined maximum firing force threshold or threshold range. The adjustable resistor module (140B) is arranged on the lower surface (132) of the printed circuit board assembly (130). The adjustable resistor module (140B) is arranged near the edge of the printed circuit board assembly (130) in the lateral direction and faces the outside of the inner frame assembly (110). The lateral direction of the printed circuit board assembly (130) is substantially perpendicular to the direction along which the firing rod (106) extends.

[0107] This application is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation to cover all such modifications as well as equivalent structures and functions.

Claims

1. A cutting stapler, the cutting stapler (10) comprising a stapler body (100) and an actuation component (200) attached to the stapler body (100), characterized in that, The stapler body (100) is provided with an inner frame assembly (110), which is housed within the outer shell of the stapler body (100). The following are mounted on the inner frame assembly (110): The motor (120) is supplied with current and driven to output torque, which is transmitted via a gear-rack mechanism to the firing rod (106) of the cutting stapler (10) to generate the firing force of the cutting stapler; The gear-rack transmission mechanism includes a first bevel gear (122) coaxially mounted with the output end (121) of the motor (120) and rotating with the output end (121); a second bevel gear (123) mounted perpendicularly to the first bevel gear (122) and meshing with the first bevel gear (122); a spur gear (124) coaxially mounted with the second bevel gear (123) and rotating with the second bevel gear (123); and a rack (125) meshing with the spur gear (124) and connected to the firing lever (106). A printed circuit board assembly (130) is arranged on the upper part of the inner frame assembly (110), and the circuitry for the motor (120) is integrated on the printed circuit board assembly (130). and An adjustable resistor module (140B) is connected in the circuit of the motor (120) for regulating the current supplied to the motor (120). The adjustable resistor module (140B) is arranged on the lower surface (132) of the printed circuit board assembly (130), near the lateral edge of the printed circuit board assembly (130), and facing the outer side of the inner frame assembly (110). The lateral direction of 30) is substantially perpendicular to the direction along which the firing rod (106) extends, wherein the firing force of the cutting stapler (10) is determined by measuring the force transmitted to the rack (125) mounted in the inner frame assembly (110), and after measuring the firing force, the adjustable resistor module (140B) is adjusted such that the maximum firing force output by the cutting stapler (10) does not exceed a predetermined maximum firing force threshold or threshold range.

2. The cutting and anastomosis device according to claim 1, characterized in that, The circuit of the motor (120) also includes a motor drive chip (150) for detecting and controlling the current supplied to the motor.

3. The cutting and anastomosis device according to claim 2, characterized in that, The motor drive chip (150) is disposed on the lower surface (132) of the printed circuit board assembly (130).

4. The cutting and anastomosis device according to claim 2, characterized in that, The adjustable resistor module (140B) is connected in series with the motor drive chip (150). One end of the adjustable resistor module (140B) is electrically connected to the current limiting terminal (ILIM) of the motor drive chip (150), and the other end of the adjustable resistor module (140B) is grounded.

5. The cutting anastomosis device according to claim 2, characterized in that, The adjustable resistor module (140B) is connected in series with the motor (120). One end of the adjustable resistor module (140B) is electrically connected to the motor (120), and the other end of the adjustable resistor module (140B) is electrically connected to the motor drive chip (150).

6. The cutting anastomosis device according to any one of claims 1 to 5, characterized in that, The adjustable resistor module (140B) includes one or more resistors.

7. The cutting anastomosis device according to any one of claims 1 to 5, characterized in that, The adjustable resistor module (140B) is provided with a resistor adjustment section (141) for helping to adjust the resistance value.

8. The cutting anastomosis device according to claim 7, characterized in that, The resistance adjustment section (141) of the adjustable resistor module (140B) faces the outside of the inner frame assembly (110).

9. An adjustment device for a cutting stapler, said cutting stapler (10) being a cutting stapler according to any one of claims 1 to 8, characterized in that, The adjusting device (30) is used to adjust the resistance value of the adjustable resistor module (140B) in the inner frame assembly (110) of the cutting anastomosis device (10), and the adjusting device (30) includes: The inner frame assembly (110) of the cutting stapler (10) to be adjusted is placed on the base (31); Cover (32), which can be opened and closed relative to the base (31), is used to hold the inner frame assembly (110) to be adjusted between the base (31) and the cover (32); A plunger (34) is configured to operably contact the rack (125) of the inner frame assembly (110) of the cutting stapler (10) and to move back and forth in the direction along which the rack (125) extends under the action of the rack (125). A retractable elastic member (35), one end of which is operably in contact with the plunger (34), and the other end of which is connected to a pressure sensor (36), the plunger (34) being located between the rack (125) and the elastic member (35); and The pressure sensor (36) is used to measure the force of the rack (125). The resistance value of the adjustable resistor module (140B) is adjusted according to the force value displayed by the pressure sensor (36) until the force value displayed by the pressure sensor (36) is equal to the predetermined maximum firing force threshold or threshold range of the cutting stapler (10).

10. The adjusting device for a cutting stapler according to claim 9, characterized in that, The elastic member (35) is a compression spring.

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