CN116725599A - Cutting stapler and adjusting device for a cutting stapler - Google Patents

Abstract

The present application relates to a cutting stapler and an adjusting device for a cutting stapler. The cutting stapler (10) comprises a stapler body (100) and an execution assembly (200), wherein the stapler body is provided with an inner frame assembly (110), and the inner frame assembly is provided with: a motor (120); a gear-rack transmission mechanism; a printed circuit board assembly (130) disposed at an upper portion of the inner frame assembly (110), on which a circuit for the motor is integrated; and an adjustable resistance module (140B) connected in a circuit of the motor for adjusting a current supplied to the motor, the resistance value of the adjustable resistance module (140B) being adjusted such that a maximum firing force output by the cutting stapler (10) does not exceed a predetermined maximum firing force threshold or threshold range, the adjustable resistance module being disposed on a lower surface of the printed circuit board assembly, adjacent to an edge in a lateral direction of the printed circuit board assembly, and facing an outer side of the inner frame assembly.

Description

Cutting stapler and adjusting device for a cutting stapler

Technical Field

The present application relates to a cutting stapler and an adjusting device for a cutting stapler.

Background

Cutting staplers are widely used in a variety of minimally invasive procedures, such as for excision, transection, and anastomosis of tissue in open procedures for abdominal surgery, gynecology, pediatrics, and thoracic surgery. The cutting anastomat mainly comprises an execution assembly for executing operations such as excision, transection, anastomosis and the like, and an anastomat body for operating the execution assembly to execute various functions. The actuating assembly is provided with a cartridge assembly or the like for stapling tissue. The distal end of the stapler body is engaged with the implement assembly, and the proximal end of the stapler body has a handle, motor, control unit, etc. The stapler body is sometimes also referred to as an operating assembly. The firing force generated at the motor in the stapler body will be transferred to the implement assembly.

However, the firing force of the cutting stapler cannot be excessive. Excessive firing force causes the following problems.

First, when the firing force is excessive, the cartridge assembly is destroyed when fired, thereby creating assembly damage such as expansion plate breakage, cutter breakage, and the like, and also rendering the cutter non-retractable, causing damage to the patient.

Second, for example, in the case of an excessively thick tissue site of an obese patient or a site with a large resistance such as a stone, the firing force theoretically required may be significantly increased. However, even if the force of the striking is increased, the problem that the nail is only cut but not formed in the ultra-thick tissue or the large-resistance part and the like can occur in practice, so that bleeding is caused by the fact that the nail cannot be sutured after the tissue is cut off, and the clinical risk is increased. To avoid this problem, the cutting stapler is prevented from firing on such extra thick tissue or high resistance sites. When the maximum firing force of the cutting stapler is limited and is less than the theoretically required firing force of the ultra-thick tissue or the high-resistance part, the cutting stapler does not fire on the ultra-thick tissue or the high-resistance part and automatically stops.

In view of the above, there is a need to limit the maximum firing force of a cutting stapler.

For manual cutting staplers, the maximum firing force is currently limited mainly by mechanical structures. When the firing force of the cutting stapler is too great, breakage of the teeth on the drive rack or slippage of the assembly can be activated, thereby limiting the input of maximum firing force.

However, there is also a need for a technique that can reliably limit the maximum firing force for an electric cutting stapler.

Disclosure of Invention

According to a first aspect of the present application there is provided a cutting stapler comprising a stapler body, and an actuating assembly attached to the stapler body, characterized in that the stapler body is provided with an inner frame assembly housed in a housing of the stapler body, on which is mounted: a motor supplied with current to be driven to output a torque that is transmitted to a firing bar of the cutting stapler via a gear-rack transmission mechanism to generate a firing force of the cutting stapler; the gear-rack transmission mechanism comprises a first bevel gear coaxially installed with the output end of the motor and rotating along with the output end, a second bevel gear vertically installed relative to the first bevel gear and meshed with the first bevel gear, a spur gear coaxially installed relative to the second bevel gear and rotating along with the second bevel gear, and a rack meshed with the spur gear and connected with the firing bar; a printed circuit board assembly disposed at an upper portion of the inner frame assembly, on which a circuit for the motor is integrated; and an adjustable resistor module connected in a circuit of the motor for adjusting a current supplied to the motor, the resistor value of the adjustable resistor module being adjusted such that a maximum firing force output by the cutting stapler does not exceed a predetermined maximum firing force threshold or threshold range, the adjustable resistor module being disposed on a lower surface of the printed circuit board assembly, the adjustable resistor module being disposed proximate an edge of the printed circuit board assembly in a lateral direction, and the adjustable resistor module facing an outer side of the inner frame assembly, the lateral direction of the printed circuit board assembly being substantially perpendicular to a direction along which the firing bar extends. By adopting the adjustable resistance module to calibrate the maximum firing force of each cutting anastomat, the application realizes the accurate and stable control of the maximum firing force of the cutting anastomat only through electromechanical control. Furthermore, the damage to the patient caused by the damage to the nail bin assembly of the cutting anastomat when the nail bin assembly is triggered can be avoided. Meanwhile, the percussion of the cutting anastomat on the ultra-thick tissue or the high-resistance part can be avoided, and the problem that bleeding is caused by the fact that the suturing is impossible after the tissue is cut off can be avoided.

According to a preferred embodiment, a motor drive chip for detecting and controlling the current supplied to the motor is also provided in the electrical circuit of the motor. For example, the motor drive chip may be a brushed motor drive chip.

According to a preferred embodiment, the motor drive chip is arranged on the lower surface of the printed circuit board assembly. In this way, damage to various functional components protruding relative to the surface of the printed circuit board assembly can be avoided. In addition, installation space for these functional components can be saved.

According to a preferred embodiment, the adjustable resistor module is connected in series with the motor drive chip, one end of the adjustable resistor module is electrically connected to the current limiting end of the motor drive chip, and the other end of the adjustable resistor module is grounded. The power consumption of the connection scheme is small, and the connection scheme is used for changing the current judgment threshold value of the motor driving chip, so that the current value supplied to the motor is changed.

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

According to a preferred embodiment, the firing force of the cutting stapler is measured by measuring the force transmitted to a rack mounted in the inner frame assembly. This is very convenient when adjusting with an adjusting device.

According to a preferred embodiment, the adjustable resistance module comprises one or more resistances. The number of resistors can be selected as desired, and an adjustable resistor module having a desired rate of change of resistance and a desired resistance adjustment range can be set.

According to a preferred embodiment, the adjustable resistance module is provided with a resistance adjustment portion for helping to adjust the resistance value. For example, the resistance adjusting portion may be a groove into which an adjusting tool such as a screwdriver is to be inserted.

According to a preferred embodiment, the resistance adjustment of the adjustable resistance module faces the outside of the inner frame assembly. Therefore, the resistance value of the adjustable resistance module is convenient for a worker to adjust.

According to a second aspect of the present application, there is provided an adjustment device for a cutting stapler according to the preceding aspect, wherein the adjustment device is for adjusting the resistance value of an adjustable resistance module in an inner frame assembly of the cutting stapler, the adjustment device comprising: a base on which an inner frame assembly of a cutting stapler to be adjusted is placed; a cover 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 be in operable contact with a rack of an inner frame assembly of a cutting stapler and to be movable back and forth in a direction along the rack by the rack; a retractable elastic member having one end in operable contact with a plunger and the other end connected to the pressure sensor, the plunger being located between the rack and the elastic member; and the pressure sensor is used for measuring the force of the rack, and the resistance value of the adjustable resistance module is adjusted according to the force value displayed by the pressure sensor until the force value displayed by the pressure sensor is equal to a preset maximum firing force threshold value or a threshold range of the cutting anastomat. The adjusting device is simple to operate, does not need to measure or calculate the magnitude of the current value which is required to be supplied to the motor, and can accurately adjust the maximum firing force of the cutting anastomat.

According to a preferred embodiment, the elastic member is a compression spring. The compression spring can play a buffering role, reduces the influence of rack movement, and is favorable for starting the motor. At the same time, the compression spring does not adversely affect the measurement of the rack force.

Other features of the present application will become apparent from the following description of exemplary embodiments, which refers to the accompanying drawings.

Drawings

The present application will now be described in detail hereinafter with reference to the accompanying drawings. It will be understood that the figures are not necessarily to scale; in addition, components shown in a certain drawing may be omitted from other drawings for convenience of illustration. The drawings are only for purposes of illustrating exemplary embodiments of the application and are not to be construed as limiting the scope of the application. In the drawings:

FIG. 1 is a perspective view schematically illustrating the overall structure of a cutting stapler according to an exemplary embodiment of the present application;

fig. 2 is an exploded perspective view schematically illustrating a stapler body of a cutting stapler;

FIG. 3 is a schematic view of the cutting stapler body with portions of the housing and portions of the internal structure removed to more clearly illustrate the gear-rack drive mechanism;

fig. 4 is a graph schematically showing a motor characteristic curve;

fig. 5 is a perspective view schematically illustrating an inner frame assembly and a resistor module of the stapler body;

fig. 6 is a schematic perspective view of a printed circuit board assembly viewed from obliquely above according to another embodiment;

fig. 7 is a schematic perspective view of the printed circuit board assembly viewed obliquely from below;

FIG. 8 is another schematic perspective view of the printed circuit board assembly from a different oblique lower view;

FIG. 9 is a block diagram schematically illustrating the installation of an adjustable resistance module in a current;

FIG. 10 is another block diagram schematically illustrating the installation of an adjustable resistance module in a current;

fig. 11 is a block diagram schematically illustrating the inventive concept of employing an adjustable resistance module;

fig. 12 is a perspective view schematically showing an adjusting apparatus for adjusting the resistance value of the adjustable resistance module;

FIG. 13 is a schematic perspective view of the adjustment device with the cover removed; and

fig. 14 is a schematic cross-sectional view of an adjustment device.

List of reference numerals

10-cutting stapler 100-stapler body 200-executing assembly

101-first housing half 102-second housing half 103-first knob assembly

104-second knob assembly 105-battery pack 106-firing bar

110-inner frame assembly 111-firing button 112-retraction button

120-motor 121-output end 122-first bevel gear

123-second bevel gear 124-straight gear 125-rack

130-printed circuit board assembly 131-upper surface 132-lower surface

140A-resistance module 140B-adjustable resistance module 141-resistance adjusting part

150-motor drive chip 30-regulating device 31-base

32-cover 33-sleeve 34-plunger

35-elastic member 36-pressure sensor

Detailed Description

Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It is to be understood that the description of the various embodiments is merely illustrative and not intended as any limitation of the technology of the present application. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments.

It should be understood that throughout the drawings, like reference numerals refer to like elements. In the drawings, the dimensions of some of the elements may be modified, exaggerated, or reduced for clarity; or some components may be omitted or schematically represented in order to highlight certain components.

Unless otherwise indicated, all terms used in the specification have meanings commonly understood by those skilled in the art. Well-known functions or constructions may not be described in detail for brevity and/or clarity or until such time as they are not germane to the application.

As used in this specification, the singular forms "a", "an", and "the" include plural referents unless the content clearly dictates otherwise. The use of the terms "comprising," "including," and "containing" in the specification mean that the recited features are present, but that one or more other features are not excluded. The use of the phrase "and/or" in the specification includes any and all combinations of one or more of the associated listed items.

In the description, an element is referred to as being "on," "attached" to, "connected" to, "contacting" or the like another element, and the element may be directly on, attached to, connected to, or contacting the other element or intervening elements may be present. This definition applies to similar expressions.

In the description, the terms "first," "second," "third," and the like are used merely for distinguishing between various components and not for limiting the order and function of the various components. Further, the following components such as "second" or "third" may be provided without providing or employing the preceding components such as "first".

In the specification, "proximal" refers to the side proximal to the operator (e.g., surgeon) of cutting stapler 10, and "distal" refers to the side distal to the operator (i.e., proximal to the patient).

In the specification, unless otherwise indicated, "left", "right", "upper", "lower", "outer", "inner", and the like are with reference to the directions in the drawings. It should be understood that the use of spatial relationships such as "left", "right", "upper", "lower", "outer", "inner", etc., are intended to illustrate the relationship of one feature to another feature in the drawings. It should be understood that the spatial relationship terms encompass different orientations of cutting stapler 10 and adjustment device 30 in use or operation in addition to the orientations shown in the figures.

< first embodiment >

Next, the basic structure of a cutting stapler 10 according to a first exemplary embodiment of the present application will be described taking an electric cutting stapler as an example with reference to fig. 1. Cutting stapler 10 basically includes a stapler body 100 provided with various elements such as a motor, a rack-and-pinion drive, a printed circuit board, etc., and an actuating assembly 200 that can be detachably attached to stapler body 100. The execution assembly 200 is used to perform various operations such as cutting and stapling by receiving firing forces from a firing bar 106 (described below). The execution component 200 may be of different types. The same stapler body 100 can be used with a plurality of different types of execution assemblies 200.

Fig. 2 shows an exploded perspective view of the stapler body 100. 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 form the outer housing of the stapler body 100. In the outer casing of the stapler body 100, an inner frame assembly 110 is accommodated. The inner frame assembly 110 is a core component of the stapler body 100, on which a motor 120, a rack-and-pinion mechanism, a Printed Circuit Board Assembly (PCBA) 130, etc., which will be described in detail later, are assembled. In addition, the firing bar 106 will also be coupled to a rack 125 that fits within the inner frame assembly 110.

Fig. 3 illustrates one exemplary embodiment of a rack and pinion drive mechanism of cutting stapler 10. Motor 120 is used to generate a firing force to fire cutting stapler 10. Specifically, the motor 120 rotates by supplying current thereto via an electric circuit, thereby generating torque. The output torque of the motor 120 is transmitted to the firing bar 106 via a rack and pinion transmission. Only a portion of the firing bar 106 is visible in fig. 3, with the remainder of the firing bar 106 hidden from view. The rack-and-pinion gear includes a gear set and a rack. In an exemplary embodiment, the rack and pinion gear includes a first bevel gear 122 mounted coaxially with the output 121 of the motor 120 and rotating with the output 121, a second bevel gear 123 mounted perpendicularly with respect to the first bevel gear 122 and meshed with the first bevel gear 122, a spur gear 124 mounted coaxially with respect to the second bevel gear 123 and rotating with the second bevel gear 123, and a rack 125 meshed with the spur gear 124 and connected to the firing bar 106. The adoption of such a rack-and-pinion transmission mechanism including a bevel gear, a rack, etc. can change the transmission direction of the output torque of the motor, and can make the transmission mechanism more compact and save installation space. Here, the motor 120 may be a brush motor. However, other types of motors are also possible.

From the motor characteristic curve shown in fig. 4, it can be seen that the torque of the motor 120 is positively correlated with the current supplied to the motor 120. One can calculate the output torque of motor 120 from the firing force demand of the cutting stapler and calculate the current required to be supplied to motor 120 based on the calculated motor output torque. To limit the maximum firing force of cutting stapler 10, the inventors contemplate providing a resistive module 140A in the electrical circuit of motor 120 to limit the maximum current supplied to motor 120. The resistance value of resistance module 140A may be pre-calculated based on the total current supplied to cutting stapler 10, the maximum current shuntable to motor 120, etc. For the same specification of the cutting anastomat, the motor and the resistance module with the fixed resistance value are all commercially available standard components, and the structure is well known in the art and is not repeated herein. The adopted motor and fixed value resistor module can be sold outwards after being assembled into the cutting anastomat according to the standard flow.

The structure related to the arrangement of the resistance module 140A will be described below.

Fig. 5 schematically illustrates an inner frame assembly 110 of the stapler body 100. The printed circuit board assembly 130 is mounted at an upper portion of the inner frame assembly 110. Various circuit structures, chips, etc. of the cutting stapler may be integrated on the printed circuit board assembly 130. Circuitry for controlling motor 120 is also integrated on 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. In the example shown in fig. 5, the resistor module 140A is mounted on the lower surface of the printed circuit board assembly 130. However, the mounting location of the resistor module 140A on the printed circuit board assembly 130 is not particularly limited.

The first embodiment employs a fixed value of resistance 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.

< second embodiment >

The inventors have found that in the case of a fixed value resistor provided in the circuit of the motor, there may still sometimes be problems in that the maximum firing force of the cutting stapler may be too great to accurately control the maximum firing force.

The inventors have further studied and found that the reason why the firing force is too large at this time is mainly due to the following error that causes the firing force to be too large: part manufacturing errors, process material stability, errors in the motor itself (typical motor errors of up to 20% indicated by the data provided by the supplier), errors in the PCBA (i.e., printed circuit board assembly), transmission efficiency of the transmission system including gears and the like, errors in the cutting stapler system itself, and the like.

To more precisely control the maximum firing force of the cutting stapler, as a further improvement of the first embodiment, the inventors contemplate the use of an adjustable resistance module 140B in the circuit configuration of the motor, as shown in fig. 11. After the inner frame assembly 110 of the cutting stapler body is assembled, the maximum firing force that the cutting stapler can produce at this time is measured. In the event that the measured maximum firing force does not correspond to the predetermined maximum firing force threshold or threshold range that is actually needed, the resistance value of adjustable resistance module 140B is adjusted, thereby adjusting the current supplied to motor 120, the output torque of the motor, and the firing force of the cutting stapler until the maximum firing force that the cutting stapler can produce is adjusted to the predetermined maximum firing force threshold or threshold range. This solution takes into account all the errors of the cutting stapler, including the manufacturing errors of the parts, the stability of the process materials, the errors of the motor, the errors of the PCBA, the efficiency of the transmission system, the errors of the system, but is not focused on solving these errors, not calculating the current that needs to be supplied to the motor, but directly adjusting the resistance value of the front end according to the output firing force of the end. Therefore, the maximum firing force of the cutting anastomat can be accurately and stably limited.

The arrangement and adjustment process of the adjustable resistance module 140B will be described in detail below. Note that the same structures as those of the first embodiment will be denoted by the same reference numerals, and a detailed description will be omitted, and only further improvements with respect to the first embodiment and the like will be described with emphasis.

Fig. 6, 7, 8 illustrate the printed circuit board assembly 130 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, etc. are primarily integrated on the lower surface 132 of the printed circuit board assembly 130. In this way, damage to various functional components protruding relative to the surface of the printed circuit board assembly 130 can be avoided. In addition, installation space for these functional components can be saved.

An adjustable resistance module 140B for adjusting the current supplied to the motor 120 is mounted on the lower surface 132 of the printed circuit board assembly 130. The adjustable resistance module 140B may be disposed near an end in a longitudinal direction of the printed circuit board assembly 130 (i.e., a longitudinal direction of the printed circuit board assembly 130, or a direction along which the firing bar 106 extends). In addition, the adjustable resistance module 140B may be disposed near an edge in a lateral direction of the printed circuit board assembly 130 (i.e., a short side direction of the printed circuit board assembly 130, or a direction substantially perpendicular to a direction in which the firing bar 106 extends), such that the adjustable resistance module 140B faces the outside of the inner frame assembly 110 in order to access the adjustable resistance module 140B. The adjustable resistance module is a commercially available standard, the construction of which is well known in the art and will not be described in detail herein. The adjustable resistance module 140B may include one or more resistances. The number of resistors may be selected as desired. The adjustable resistance module 140B having a desired rate of change of resistance and a desired resistance adjustment range may be set as desired.

The adjustable resistance module 140B may also be provided with a resistance adjustment portion 141 for helping to adjust the resistance value. For example, the resistance adjusting portion 141 may be a groove. An adjustment tool, such as a screwdriver, will be inserted into the recess and the magnitude of the resistance value of the adjustable resistance module 140B is adjusted by rotating the screwdriver.

The adjustable resistance module 140B is integrally installed at an upper portion of the inner frame assembly 110 near a left front corner of the inner frame assembly 110. In addition, the resistance adjusting portion 141 of the adjustable resistance module 140B faces the outside of the inner frame assembly 110, i.e., faces the worker. Thereby, the operator can conveniently adjust the resistance value of the adjustable resistance module 140B.

In addition, a motor driving chip 150 (see fig. 9 and 10) for detecting and controlling the current supplied to the motor is also mounted on the lower surface 132 of the printed circuit board assembly 130. For example, the motor drive chip 150 may limit the current supplied to the motor 120 to 3A-5A. The motor drive chip 150 may be a brush motor drive chip. The motor drive chip is a commercially available standard component, the construction of which is well known in the art and will not be described in detail herein.

Fig. 9 schematically shows a first connection scheme of the adjustable resistance module 140B and the motor drive chip 150 in a circuit for controlling the motor 120. As shown, the adjustable resistor module 140B may be directly connected in series with the motor driving chip 150 for changing the current judgment threshold of the motor driving chip 150, thereby changing the current value supplied to the motor. Specifically, one end of the adjustable resistance module 140B is electrically connected to the current limiting terminal ILIM of the motor driving chip 150, and the other end of the adjustable resistance module 140B is grounded.

Fig. 10 schematically illustrates a second connection scheme of the adjustable resistance module 140B and the motor drive chip 150 in a circuit for controlling the motor 120. As shown, the adjustable resistance module 140B may also be directly connected in series with the motor 120. One end of the adjustable resistance module 140B is electrically connected with the motor 120, and the other end of the adjustable resistance module 140B is electrically connected with the motor driving 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 driving chip 150, but changes the voltage applied to the motor 120, thereby changing the current supplied to the motor. The second connection scheme consumes more power than the first connection scheme.

Note that structures (e.g., logic gate signals, etc.) in fig. 9 and 10 that are not related to the inventive point of the present application are not described again. In addition, only one exemplary embodiment of the motor driving chip 150 is shown in the drawings, and driving chips of other structures may be used for the motor.

Fig. 12, 13 and 14 schematically show perspective or sectional views of the adjusting device 30 for adjusting the resistance value of the adjustable resistance module 140B. The rack 125 of the inner frame assembly 110 is directly coupled to the firing bar 106. Accordingly, the force transmitted by the motor 120 to the rack 125 can be considered to be substantially equal to the firing force transmitted to the firing bar 106. The firing force of the cutting stapler can be measured by measuring the force transferred to the rack 125 of the inner frame assembly 110. That is, the inner frame assembly 110 may be used as a measurement object or a calibration object of the adjusting apparatus 30.

As shown, the adjusting device 30 includes a base 31, and a cover 32 openable and closable with respect to the base. The base 31 is also provided with a plunger 34 arranged in a sleeve 33. The plunger 34 is configured to be in operable contact with the rack 125 of the inner frame assembly 110 and to be movable back and forth within the sleeve 33 in a direction along the rack 125 by the rack 125. Also provided within the sleeve 33 is a resilient member 35 which is telescopic. The plunger 34 will be disposed between the rack 125 and the resilient member 35. One end of the elastic member 35 is in operative contact with the plunger 34, and the other end of the elastic member 35 is connected to the pressure sensor 36. The pressure sensor 36 is used to measure the magnitude of the force of the rack 125. Preferably, the elastic member 35 may be a compression spring. The elastic member 35 may provide a sufficiently large resistance. The elastic member 35 such as a compression spring can play a role of cushioning, reduce the influence of the movement of the rack 125, and facilitate the motor start. At the same time, the elastic member 35 does not adversely affect the measurement of the rack force.

The following describes the adjustment process of the adjustment device 30.

In a first step, the assembled inner frame assembly 110 is placed onto the base 31 of the adjustment device 30, the racks 125 of the inner frame assembly 110 are aligned with the plungers 34 of the adjustment device 30, and then the lid 32 is closed.

In a second step, the inner frame assembly 110 is powered on, and then the firing button 111 on the inner frame assembly 110 is pressed to drive the rack 125 forward and contact the plunger 34 until the rack 125 stops and the force value is read when the force value is displayed by the pressure sensor 36.

Third, the retraction button 112 on the inner frame assembly 110 is pressed to retract the rack 125 to a position.

Fourth, the adjustment tool is inserted into the resistance adjustment portion 141 of the adjustable resistance module 140B, and the adjustment tool is rotated in a clockwise or counterclockwise direction. For example, a clockwise rotation may increase the magnitude of the measured force and a counterclockwise rotation may decrease the magnitude of the measured force.

And fifth, repeating the second step to the fourth step or the third step to the fourth step until the value of the measured force is equal to a preset maximum firing force threshold or threshold range.

Sixth, the lid 32 is opened and the adjusted inner frame assembly 110 is unloaded in preparation for the next adjustment of the inner frame assembly 110.

In summary, as shown in fig. 11, the present embodiment adjusts the resistance value of the adjustable resistance module 140B in the circuit of the motor 120 based on the firing force (i.e., the tip 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, does not need to measure or calculate the magnitude of the current value that should be supplied to the motor 120, and is capable of accurately adjusting the maximum firing force of the cutting stapler. The maximum firing force of the calibrated cutting stapler 10 is stable and accurate. Furthermore, the damage to the patient caused by the damage to the nail bin assembly of the cutting anastomat when the nail bin assembly is triggered can be avoided. Meanwhile, the percussion of the cutting anastomat on the ultra-thick tissue or the high-resistance part can be avoided, and the problem that bleeding is caused by the fact that the suturing is impossible after the tissue is cut off can be avoided.

The present embodiment achieves accurate and stable control of the maximum firing force of the cutting stapler 10 by electromechanical control only, without software control, and thus at a lower cost. In contrast, the solution of providing a sensor for monitoring the firing force in real time in a cutting stapler and dynamically adjusting the firing force by means of a software system requires a large modification of the structure of the existing cutting stapler, which is also costly.

The maximum firing force limiting scheme adopting the adjustable resistance module is not only suitable for an electric cutting anastomat, but also suitable for a manual cutting anastomat.

The contents described with reference to any one of the first embodiment and the second embodiment may be applied to the other embodiment as long as there is no conflict.

In addition, the following examples are also included within the scope of the present application and may serve as a basis for subsequent modification.

Example A ]

A cutting stapler, the cutting stapler (10) comprising a stapler body (100), and an executing 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 in the outer casing of the stapler body (100), on which inner frame assembly (110) is mounted:

a motor (120) supplied with current to be driven to output a torque that is transmitted to a firing bar (106) of a cutting stapler (100) via a gear-rack transmission to generate a firing force of the cutting stapler;

the gear-rack transmission mechanism comprises a gear set and a rack (125), and the rack (125) is connected with the firing bar (106);

a printed circuit board assembly (130) disposed at an upper portion of the inner frame assembly (110), a circuit for the motor (120) being integrated on the printed circuit board assembly (130); and

-a resistor module (140A, 140B) connected in the circuit of the motor (120) 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 resistor module (140A, 140B) being arranged on the lower surface (132) of the printed circuit board assembly (130), the resistor module (140A, 140B) being arranged close to an edge in a lateral direction of the printed circuit board assembly (130), and the resistor module (140A, 140B) facing the outside of the inner frame assembly (110), said lateral direction of the printed circuit board assembly (130) being substantially perpendicular to the direction in which the firing bar (106) extends.

< example B >

A cutting stapler, the cutting stapler (10) comprising a stapler body (100), and an executing 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 in the outer casing of the stapler body (100), on which inner frame assembly (110) is mounted:

a motor (120) supplied with current to be driven to output a torque that is transmitted to a firing bar (106) of a cutting stapler (100) to generate a firing force of the cutting stapler;

a printed circuit board assembly (130) disposed at an upper portion of the inner frame assembly (110), a circuit for the motor (120) being integrated on the printed circuit board assembly (130); and

an adjustable resistance module (140B) connected in the circuit of the motor (120) for adjusting the current supplied to the motor (120), the resistance value of the adjustable resistance module (140B) being 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.

Example C ]

A cutting stapler, the cutting stapler (10) comprising a stapler body (100), and an executing 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 in the outer casing of the stapler body (100), on which inner frame assembly (110) is mounted:

a motor (120) supplied with current to be driven to output a torque that is transmitted to a firing bar (106) of a cutting stapler (100) to generate a firing force of the cutting stapler;

a printed circuit board assembly (130) disposed at an upper portion of the inner frame assembly (110), a circuit for the motor (120) being integrated on the printed circuit board assembly (130); and

an adjustable resistor module (140B) connected in the circuit of the motor (120) for adjusting the current supplied to the motor (120), the resistor value of the adjustable resistor module (140B) being 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) being arranged on the lower surface (132) of the printed circuit board assembly (130), the adjustable resistor module (140B) being arranged close to an edge in a lateral direction of the printed circuit board assembly (130), and the adjustable resistor module (140B) facing the outside of the inner frame assembly (110), said lateral direction of the printed circuit board assembly (130) being substantially perpendicular to the direction along which the firing bar (106) extends.

The application is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (11)

1. A cutting stapler, the cutting stapler (10) comprising a stapler body (100), and an executing 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 in the outer casing of the stapler body (100), on which inner frame assembly (110) is mounted:

a motor (120) supplied with current to be driven to output a torque that is transmitted to a firing bar (106) of a cutting stapler (100) via a gear-rack transmission to generate a firing force of the cutting stapler;

the gear-rack transmission mechanism includes a first bevel gear (122) coaxially installed with an output end (121) of the motor (120) and rotated together with the output end (121), a second bevel gear (123) vertically installed with respect to the first bevel gear (122) and engaged with the first bevel gear (122), a spur gear (124) coaxially installed with respect to the second bevel gear (123) and rotated together with the second bevel gear (123), and a rack gear (125) engaged with the spur gear (124) and connected with the firing bar (106);

a printed circuit board assembly (130) disposed at an upper portion of the inner frame assembly (110), a circuit for the motor (120) being integrated on the printed circuit board assembly (130); and

an adjustable resistor module (140B) connected in the circuit of the motor (120) for adjusting the current supplied to the motor (120), the resistor value of the adjustable resistor module (140B) being 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) being arranged on the lower surface (132) of the printed circuit board assembly (130), the adjustable resistor module (140B) being arranged close to an edge in a lateral direction of the printed circuit board assembly (130), and the adjustable resistor module (140B) facing the outside of the inner frame assembly (110), said lateral direction of the printed circuit board assembly (130) being substantially perpendicular to the direction along which the firing bar (106) extends.

2. The cutting stapler according to claim 1, wherein a motor drive chip (150) for detecting and controlling the current supplied to the motor is further provided in the circuit of the motor (120).

3. The cutting stapler according to claim 2, wherein the motor drive chip (150) is arranged on a lower surface (132) of the printed circuit board assembly (130).

4. The cutting stapler according to claim 2, wherein the adjustable resistance module (140B) is connected in series with the motor drive chip (150), one end of the adjustable resistance module (140B) is electrically connected to a current limiting terminal (ILIM) of the motor drive chip (150), and the other end of the adjustable resistance module (140B) is grounded.

5. The cutting stapler according to claim 2, wherein the adjustable resistance module (140B) is connected in series with the motor (120), one end of the adjustable resistance module (140B) is electrically connected with the motor (120), and the other end of the adjustable resistance module (140B) is electrically connected with the motor driving chip (150).

6. The cutting stapler according to any one of claims 1-5, wherein the firing force of the cutting stapler (10) is determined by measuring the force transferred to a rack (125) mounted in the inner frame assembly (110).

7. The cutting stapler according to any one of claims 1-5, wherein the adjustable resistance module (140B) comprises one or more resistances.

8. The cutting stapler according to any one of claims 1-5, wherein the adjustable resistance module (140B) is provided with a resistance adjustment (141) for helping to adjust the resistance value.

9. The cutting stapler according to claim 8, wherein the resistance adjustment portion (141) of the adjustable resistance module (140B) faces the outside of the inner frame assembly (110).

10. An adjustment device for a cutting stapler, the cutting stapler (10) being a cutting stapler according to any one of claims 1 to 9, characterized in that the adjustment device (30) is for adjusting a resistance value of an adjustable resistance module (140B) in an inner frame assembly (110) of the cutting stapler (10), the adjustment device (30) comprising:

a base (31), an inner frame assembly (110) of the cutting stapler (10) to be adjusted being placed on the base (31);

a cover (32) openable and closable with respect to the base (31) for clamping the inner frame assembly (110) to be adjusted between the base (31) and the cover (32);

a plunger (34) configured to be in operable contact with a rack (125) of an inner frame assembly (110) of a cutting stapler (10) and to be movable back and forth under the action of the rack (125) in a direction along which the rack (125) extends;

a telescopic elastic member (35), one end of which is in operative contact with the plunger (34), 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 for measuring the force of the rack (125), and the resistance value of the adjustable resistance 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 a preset maximum firing force threshold or threshold range of the cutting anastomat (10).

11. An adjustment device for a cutting stapler according to claim 10, characterized in that said elastic member (35) is a compression spring.