CN215079029U - Electric surgical handheld equipment and surgical instrument - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, a hand-held device of electronic surgery and surgical instrument is disclosed, this hand-held device includes: a handle assembly; the driving mechanism is arranged in the handle assembly and provides driving force for the instrument; the transmission mechanism comprises a rack and a transmission gear which is operatively connected with the driving mechanism, and the driving mechanism drives the rack to move through the transmission gear; the unlocking component is driven by the transmission component to release the connection between the transmission mechanism and the driving mechanism and further release the connection between the transmission mechanism and the transmission component so as to allow the rack to reset under the further driving of the transmission component; the rack can be reset manually when the electric control fails.

Description

Electric surgical handheld equipment and surgical instrument

Technical Field

The utility model relates to the technical field of medical equipment, in particular to electric surgical handheld device and surgical instrument.

Background

With the development of surgical anastomosis technology, and the gradual maturity and perfection of motor driving technology and battery packaging technology, surgical instruments are more and more accepted by many doctors at home and abroad due to the advantages of remarkably reducing the labor intensity of operators, reducing the shaking of the distal end of an end effector, improving the staple forming effect, reducing complications of anastomosis orifices, performing fine anastomosis operation of tissues and the like in clinical application. Compared with the traditional manual anastomat, the surgical instrument usually adopts a motor as a driving source, is internally provided with a battery for power supply or is externally connected with a cable for power supply, and converts the output power of the motor into the sagittal linear motion and the push-pull force of a firing member through a transmission mechanism of a gear rack. The end effector includes jaws for grasping tissue, and the firing member does not return to an initial position to open the jaws to release the tissue.

However, in the event of a motor failure, or a power failure, or an electronic control system failure, the motor and gear train of the surgical instrument become mechanically locked and the firing member within the instrument cannot be forced back to the initial position by manually driving the instrument to open the end effector jaws and safely remove the instrument in any position, at any time, as with manual staplers.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an electric surgical handheld device and surgical instrument for but manual drive apparatus forces the inside percussion component of apparatus to get back to initial position when electric control became invalid.

In order to achieve the above purpose, the utility model provides the following technical scheme:

in a first aspect, there is provided a powered surgical handpiece, the handpiece comprising:

a handle assembly;

the driving mechanism is arranged in the handle assembly and provides driving force for the instrument;

the transmission mechanism comprises a rack and a transmission gear which is operatively connected with the driving mechanism, and the driving mechanism drives the rack to move through the transmission gear;

the handle assembly further comprises an unlocking component and a transmission component which are arranged in the handle assembly, wherein the unlocking component is driven by the transmission component to release the connection between the transmission mechanism and the driving mechanism and further release the connection between the unlocking component and the transmission component so as to allow the rack to reset under the further driving of the transmission component.

In the above-described hand-held device, the transmission member may drive the unlocking member to release the connection of the transmission mechanism and the drive mechanism, and thus, the connection with the transmission member may be released. Therefore, the rack can be reset under the further driving of the transmission part, and the rack and the firing component can be manually reset when the electric control fails.

Alternatively, the transmission member is operatively moved in a direction to decouple the drive mechanism from the transmission mechanism and drive the rack of the transmission mechanism back to the initial position.

Optionally, the driving mechanism comprises a motor provided with a driving gear operatively connected with the transmission gear; the unlocking component drives the transmission gear to move towards a third direction under the driving of the transmission component so as to release the connection between the driving mechanism and the transmission mechanism.

Optionally, the unlocking component is provided with a first guide surface, the transmission gear is provided with a second guide surface, and under the mutual cooperation of the first guide surface and the second guide surface, the movement of the unlocking component in the second direction is converted into the movement of the transmission gear in the third direction.

Optionally, at least a portion of the transmission member is disposed in the rack, and when the transmission member is released from the limit of the unlocking member, the transmission member is operable to slide relative to the rack, and then the rack is moved together.

Optionally, the handle assembly further includes a frame, a fourth guide surface is disposed on the frame, and the fourth guide surface is matched with the third guide surface of the unlocking member to convert the movement of the unlocking member in the second direction into the movement of the unlocking member in the first direction, so as to release the connection between the unlocking member and the transmission member.

Optionally, the transmission component comprises a pull rod and a slide block connected to the far end of the pull rod; the rack has a slide groove extending in the second direction, and the slider is slidably fitted in the slide groove.

Optionally, the length of the sliding chute is greater than or equal to the firing stroke of the rack, and the length of the pull rod is greater than or equal to the firing stroke of the rack.

Optionally, the proximal end of the transmission member is provided with a through hole allowing the pull rod to slidably pass through and retaining the slider in the sliding groove of the rack.

Optionally, the handle assembly further comprises a battery pack, the battery pack is provided with a draw hook used for being matched with the transmission part, an opening is formed in the near end of the handle shell of the handle assembly, and the battery pack and the draw hook are matched in the opening.

In a second aspect, there is provided a surgical instrument comprising a handpiece as described in the previous aspects, further comprising an elongate body assembly disposed at a distal end of the handle assembly, an end effector removably mounted at the distal end of the elongate body assembly.

The surgical instrument has the same advantages as the powered surgical hand-held device over the prior art and will not be described in detail here.

Drawings

FIGS. 1 and 2 illustrate a schematic structural view of a surgical instrument provided in accordance with an embodiment of the present application;

FIGS. 3-6 illustrate a schematic view of portions of the interior of the surgical instrument illustrated in FIG. 1;

FIG. 7 shows a cross-sectional view of the engagement of the unlocking member, the rack, the slider, the transmission member and the battery pack in the configuration shown in FIGS. 4 to 6;

FIG. 8 shows a close-up view at L in FIG. 7;

FIG. 9 is a schematic view of the slider of FIGS. 4-6;

FIG. 10 is a perspective view of the engagement of the release member, rack, slide, transmission member and battery pack in the configuration of FIGS. 4-7;

FIG. 11 shows a schematic view of the pull rod of FIG. 10;

fig. 12 is a schematic structural view of the unlocking member shown in fig. 4 to 6;

figure 13 shows a top view of the release member of figures 4 to 6 in cooperation with the frame;

FIG. 14 shows an enlarged partial view at Q of FIG. 13;

fig. 15 shows the handle of fig. 1 with the battery pack removed.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

In various embodiments of the present invention, "distal" refers to the end of the surgical instrument that is distal from the operator when the surgical instrument is operated, and "proximal" refers to the end of the surgical instrument that is proximal to the operator when the surgical instrument is operated.

FIG. 1 is a schematic diagram of the construction of one embodiment of asurgical instrument 100. The illustrated embodiment is an endoscopic instrument and, in general, the embodiments of thesurgical instrument 100 described herein are endoscopic surgical cutting and stapling instruments. However, it should be noted that the surgical instrument may also be a non-endoscopic surgical cutting stapling instrument, such as an open surgical instrument for open surgery.

In particular, fig. 1 showssurgical instrument 100 includinghandle assembly 80,elongate body 10, andend effector 70, whereinelongate body 10 extends distally from a distal end ofhandle assembly 80,end effector 70 is removably mounted to a distal end ofelongate body 10, andend effector 70 is adapted to perform a particular surgical procedure, such as grasping, stapling/stapling, cutting, etc., tissue. Disposed withinend effector 70 is a movable firing member (not shown in FIG. 1) for performing a particular surgical procedure. As further shown in fig. 1, thehandle assembly 80 includes ahandle housing 83 and atrigger 81, thehandle housing 83 including agripping portion 82 extending in a third direction (refer to the Z-direction in fig. 1) and areceiving portion 84 extending in a second direction (refer to the X-direction in fig. 1) of theelongated body 10. In operation, when thetrigger 81 is pulled in the direction of thegripping portion 82, jaw closure of theend effector 70 is achieved. In addition,trigger 81 may also be configured to control the output of the drive mechanism ofsurgical instrument 100.

It should be noted that while the embodiments ofsurgical instrument 100 described herein are configured withend effector 70 that cuts stapled tissue, in alternative embodiments, other techniques for cutting stapled tissue may be configured. For example, end effectors that use RF energy or adhesives to staple tissue may also be used.

As further shown in fig. 1 and 2,surgical instrument 100 according to embodiments of the present invention further includes arotator head 86, whereinrotator head 86 is mounted distally ofhandle assembly 80 and is fixedly coupled to the proximal end ofelongated body 10, such thatrotator head 86, when manipulated to rotate about longitudinal axis C ofsurgical instrument 100, causeselongated body 10 andend effector 70 to rotate together. In addition,surgical instrument 100 of the present embodiment further includes aturn knob 87, where theturn knob 87 is rotatably mounted on therotary head 86 and adapted to drive theend effector 70 to perform a pivoting motion when theturn knob 87 is operated to rotate.

With further reference to fig. 3, the present embodiment provides an internal structure of ahandle assembly 80 of asurgical instrument 100, wherein adriving mechanism 85 is disposed in ahandle housing 83, thedriving mechanism 85 provides output power for thesurgical instrument 100, acontrol device 853 is further disposed in thehandle housing 83 to control the output power of thedriving mechanism 85, and thecontrol device 853 may be a control circuit board. Thedrive mechanism 85 for thesurgical instrument 100 may be any type of motor that can satisfy the specific output form and requirements of thesurgical instrument 100, for example, thedrive mechanism 85 of thesurgical instrument 100 described in this embodiment employs a dc brush motor, and the functions of electrically firing (advancing) and electrically retracting thesurgical instrument 100 are realized by the forward rotation and the reverse rotation of the motor. Of course, thedriving mechanism 85 may be a dc brushless motor or other type of motor. Thedriving mechanism 85 further includes adriving gear 854, and atransmission gear 855 operatively engaged with thedriving gear 854, thedriving gear 854 being connected to an output shaft of the motor, as shown with reference to fig. 4 and 5.

With continued reference to fig. 3, thehandle assembly 80 further includes adrive mechanism 89 and aframe 830 supporting thedrive mechanism 89, thedrive mechanism 89 being disposed within thehandle assembly 80 and including agear rack 891, thegear rack 891 being operatively engaged with adrive gear 855 of thedrive mechanism 85. Thedrive mechanism 89 further includes afiring rod 892, the firingrod 892 having a proximal end coupled to therack 891 and a distal end removably coupled to a firing member in the end effector 70 (as shown in FIG. 2). Specifically, thedriving mechanism 85 drives therack 891 to reciprocate along the second direction to drive the firingrod 892 to reciprocate along the second direction, thereby driving the firing member to move to complete a specific surgical operation. In other embodiments,drive mechanism 85 is further provided with areduction gearbox 852, andmotor 851 is coupled to drivegear 854 viareduction gearbox 852 to provide power output forsurgical instrument 100. Thedrive gear 854 and thetransmission gear 855 are gear sets for transmitting driving forces of substantially parallel shafts, and the gear set may be one gear or a gear set formed of a plurality of gears.

Referring to fig. 3 and 4, adriving gear 855 is rotatably mounted to theframe 830 by a rotating shaft 850 and can reciprocally slide in a third direction along the rotating shaft 850, and areturn spring 855a is provided between the drivinggear 855 and theframe 830; therack 891 extends in the second direction, andteeth 891a are arranged on one side surface of therack 891 in the extending direction of therack 891, and the teeth of thetransmission gear 855 are kept engaged with theteeth 891a of therack 891 by the restoring force of the restoringspring 855 a.

Referring to fig. 4 to 6, thehandle assembly 80 further comprises an unlockingmember 60 and atransmission member 90, the unlockingmember 60 being adapted to release thetransmission mechanism 89 from the drivingstructure 85 under the action of thetransmission member 90. Specifically, thetransmission member 90 is operated to move proximally in the second direction, and the unlockingmember 60 moves proximally in the extending direction of therack 891 under the driving of thetransmission member 90, at this time, the unlockingmember 60 drives thetransmission gear 855 of thetransmission mechanism 89 to move, so as to release the connection between thetransmission mechanism 89 and thedriving mechanism 85. Continuing to operate thetransmission member 90 to further move proximally, the unlockingmember 60 further moves proximally along the extending direction of therack 891 under the driving of thetransmission member 90, and moves in the first direction to disengage the unlockingmember 60 from thetransmission member 90; when the unlockingmember 60 is disengaged from thetransmission member 90, thetransmission member 90 is further operated to move further proximally, and thetransmission member 90 abuts against thedriving rack 891 and drives thedriving rack 891 to move proximally, thereby driving the end effector to return to the initial position.

Next, specific structures of the unlockingmember 60 and thetransmission member 90 will be described, as shown in fig. 7 to 10, thetransmission member 90 includes apull rod 91 extending in the second direction, and aslider 93 connected to a distal end of thepull rod 91, theslider 93 is specifically configured as shown in fig. 9, a threaded hole G1 extending in the second direction is provided in theslider 93, and a slot G2 extending in the first direction (with reference to the Y direction) is provided, and the distal end of thepull rod 91 is threadedly fitted in the threaded hole G1 of theslider 93. In an alternative embodiment, theslider 93 and the distal end of thepull rod 91 at the proximal end of the second direction may be fixedly connected by a one-piece structure or other fixing connection. With continued reference to fig. 7 and 8, the side of therack 891 facing away from thetooth 891a is provided with a slide groove U2 extending in the second direction, and theslider 93 is slidably received in the slide groove U2 in the second direction. The proximal wall of the slide groove U2 is formed with a through hole T1, the through hole T1 being configured to allow thepull rod 91 to slidably pass through and extend beyond the slide groove U2 while restraining theslider 93 from passing through within the slide groove U2. The proximal end of thepull rod 91 is provided with a hole T2, as shown in fig. 11, in addition, the proximal end of thepull rod 91 is further formed with apull block 92, a hole T2 is formed in thepull block 92, the pull member is matched with the hole T2 to drive thepull rod 91, the hole T2 is convenient for an operator to apply force, the structure is simple, and the operator can match with the hole T2 with a hand to drive thepull rod 91.

As shown in fig. 2, the proximal end of the receivingportion 84 is provided with an opening U1, and thehandle 80 further includes thebattery pack 30, and thebattery pack 30 is inserted into the receivingportion 84 through the opening U1. As shown in fig. 10, thebattery pack 30 is provided with apull hook 31 on a side facing theelongated body 10, thepull hook 31 is a pull part which can be matched with the hole T2, and the pull part can be other structures which can be matched with the hole T2.

Further, when the instrument works normally, theslider 93 and the unlockingcomponent 60 do not move, the rack moves normally, and the moving displacement length of the rack is the firing stroke of the rack. In order to meet the requirement of the normal moving length of the rack, the length of the sliding groove U2 in the rack in the second direction is greater than or equal to the length of the sliding distance between theslider 93 and the rack, or the length of the sliding groove U2 in the rack in the second direction is greater than or equal to the triggering stroke of the rack; and the length of thepull rod 91 is greater than or equal to the relative sliding distance between thepull rod 91 and therack 891, or the length of thepull rod 91 may be greater than or equal to the firing stroke of the rack.

Further, fig. 12 shows a perspective structure view of the unlockingmember 60 in fig. 4 to 10, specifically, the unlockingmember 60 includes amain body 64, and afirst leg 61 and asecond leg 62 respectively disposed on themain body 64, and aninsertion block 66 is disposed on an inner side (a side close to the first leg 61) of thesecond leg 62. When installed, therack 891 is installed between thefirst leg 61 and thesecond leg 62 with theteeth 891a of therack 891 facing thefirst leg 61 and theinsert 66 is plug-fit in the first direction in the receptacle G2 of theslider 93. Or, in an alternative embodiment, thefirst leg 61 is provided with an insertion hole, and the slidingblock 93 is provided with an insertion block, and the insertion block is inserted into the insertion hole along the first direction, in short, it is sufficient that the unlockingmember 60 and the slidingblock 93 can be inserted and matched along the first direction. It should be noted that the second direction/X direction, the first direction/Y direction and the third direction/Z direction of the rotation shaft 850 are perpendicular to each other in this embodiment, which is only exemplary, and there may be some engineering tolerance.

The unlockingmember 60 and thetransmission gear 855 are arranged in the third direction, and specifically, in fig. 4 and 5, the unlockingmember 60 is located above thetransmission gear 855. Referring to fig. 4 and 12, thefirst leg 61 of the unlockingmember 60 has an inclinedfirst guide surface 65, and an edge portion of thetransmission gear 855 facing one end of the unlockingmember 60 is provided with asecond guide surface 855b, and thefirst guide surface 65 of the unlockingmember 60 and thesecond guide surface 855b of thetransmission gear 855 may be arranged in parallel. Referring specifically to fig. 5, when the unlockingmember 60 is operatively moved proximally, thefirst guide surface 65 of the unlockingmember 60 contacts thesecond guide surface 855b of thetransmission gear 855, and under the interaction of thefirst guide surface 65 and thesecond guide surface 855b, the unlockingmember 60 is operatively moved proximally to drive thetransmission gear 855, and thetransmission gear 855 is pressed downward along the rotating shaft 850 in the third direction, and finally thetransmission gear 855 is disengaged from therack 891, so that the function of releasing the connection between thetransmission mechanism 89 and thedriving mechanism 85 is realized. With continued reference to fig. 12 and 13, the side end surface of themain body portion 64 of the unlockingmember 60 is further provided with athird guide surface 63 extending along thesecond leg 62 in the direction toward thefirst leg 61, and correspondingly, theframe 830 is provided with afourth guide surface 101, and preferably, thethird guide surface 63 of the unlockingmember 60 and thefourth guide surface 101 of theframe 830 may be arranged in parallel (see fig. 14 for details). When the unlockingmember 60 is operatively moved further proximally and abuts thefourth guide surface 101 of theframe 830, under the interaction of saidthird guide surface 63 and thefourth guide surface 101, the unlockingmember 60 is operatively moved in the first direction away from therack 891/transmission member 90, so that theinsert 66 of the unlockingmember 60 is separated from the insert hole G2 of theslider 93 of thetransmission member 90, thereby enabling disengagement of the unlockingmember 60 from thetransmission member 90, see in particular fig. 8. Thetransmission member 90 is further pulled proximally to slide in the sliding groove U2 of therack 891 relative to therack 891, and when theslider 93 of thetransmission member 90 abuts against the side wall of the proximal through hole T1 of therack 891, thetransmission member 90 is further pulled proximally to drive therack 891 to move proximally, thereby resetting thetransmission mechanism 89.

The following description is provided for how thedrive mechanism 85 and thetransmission mechanism 89 operate during normal operation and during a failure of the electric system.

When the electric system is in normal operation, thebattery pack 30 is inserted into theaccommodating portion 84 to supply power to themotor 851 and thecontrol device 853, specifically referring to fig. 15, an accommodating hole T3 is formed in theaccommodating portion 84 at a position opposite to thebattery pack 30, and when thebattery pack 30 is at the assembling station, thehook 31 is accommodated in the accommodating hole T3. The unlockingmember 60 is in the locked state, and thetransmission gear 855 is engaged with therack 891 by the return force of thereturn spring 855 a. The output of themotor 851, in turn, may drive the movement of thedrive gear 854, thedrive gear 855, and thegear rack 891, thereby actuating the end effector.

When the electric system fails, thebattery pack 30 is taken down, thedraw hook 31 on thebattery pack 30 hooks the hole T2, thedraw bar 91 is pulled to the proximal end side, thedraw bar 91 drives theslide block 93 to move along the slide groove U2 in the second direction to the through hole T1, thefirst guide surface 65 of the unlockingcomponent 60 presses thesecond guide surface 855b of thetransmission gear 855 in the third direction, so that thetransmission gear 855 slides downwards along the rotating shaft 850 (refer to the third direction) and presses the return spring until thetransmission gear 855 is disengaged from therack 891.

It should be understood, however, that it is not necessary for the first guide surfaces 65 to contact the second guide surfaces 855b when the unlockingmember 60 is in the locked state; when the unlockingmember 60 is pulled by thepull rod 91 in the second direction to the unlocked state, thefirst guide surface 65 contacts and slides relative to thesecond guide surface 855b, and the transmission gear moves downward and is disengaged from the rack.

Referring to fig. 13 and 14, when the unlockingmember 60 continues to move proximally in the second direction, thethird guide surface 63 and thefourth guide surface 101 are in contact and slide relative to each other, thefourth guide surface 101 is not moved, the unlockingmember 60 is pushed away in the first direction, theinsert 66 of thesecond leg 62 and the G2 of theslider 93 are disengaged, and thepull rod 91 cannot pull the unlockingmember 60 in the clutch state. The unlockingmember 60 stays at the home position (position inside the frame 830), and its upper side can be in contact with the limit portion of theframe 830 and its lower side is in abutting contact with thetransmission gear 855. Thus, thepull rod 91 can be pulled linearly in the second direction until the slidingblock 93 abuts against the side wall of the proximal end of the sliding groove U2, at which point thepull rod 91 is pulled to abut against therack 891, and then therack 891 can be driven to move in the second direction, so that therack 891 can be manually reset. Therack 891 thus drives the firingbar 892 and the firing member in theend effector 70 to move further proximally in a second direction in unison until the cutting blade moves to a position proximal of the end effector and fully opens the jaws of the end effector, at which point the operator can safely remove the failed electric stapler and its end effector from the target tissue of the patient, and finally remove the stapler from the body cavity of the patient via the puncture device, and then continue to complete the procedure after replacing the instrument.

It should be noted that thepull rod 91 is not necessarily in the form of a pull hook on thebattery pack 30, and a pull ring may be directly provided at the proximal end of thepull rod 91, so that a user can directly pull the pull ring of thepull rod 91 with fingers to unlock and reset.

Based on the same inventive concept, the present application also provides an electric surgical handheld device, which includes thehandle assembly 80, thedriving mechanism 85, thetransmission mechanism 89, the unlockingmember 60 and thetransmission member 90 in the foregoing surgical instrument embodiments, and the matching relationship and beneficial effects of the components can be referred to the foregoing description.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A powered surgical handpiece, comprising:

a handle assembly;

the driving mechanism is arranged in the handle assembly and provides driving force for the instrument;

the transmission mechanism comprises a rack and a transmission gear which is operatively connected with the driving mechanism, and the driving mechanism drives the rack to move through the transmission gear;

the handle assembly is characterized by further comprising an unlocking component and a transmission component which are arranged in the handle assembly, wherein the unlocking component is driven by the transmission component to release the connection between the transmission mechanism and the driving mechanism and further release the connection between the unlocking component and the transmission component so as to allow the rack to reset under the further driving of the transmission component.

2. The handheld device of claim 1 wherein the transmission member is operatively moved in a direction to decouple the drive mechanism from the transmission mechanism and drive the rack of the transmission mechanism back to an initial position.

3. The handheld device of claim 1 wherein the drive mechanism includes a motor having a drive gear operatively connected to the drive gear; the unlocking component drives the transmission gear to move towards a third direction under the driving of the transmission component so as to release the connection between the driving mechanism and the transmission mechanism.

4. The handheld device of claim 3, wherein the unlocking member is provided with a first guide surface, the transmission gear is provided with a second guide surface, and the first guide surface and the second guide surface cooperate with each other to convert the movement of the unlocking member in the second direction into the movement of the transmission gear in the third direction.

5. The handheld device of claim 2 wherein at least a portion of the transmission member is disposed within the rack and is operable to slide relative to the rack and subsequently move the rack with the unlocking member when the transmission member is released from engagement with the unlocking member.

6. The handheld device of claim 1 wherein the handle assembly further comprises a frame, the frame having a fourth guide surface disposed thereon, the fourth guide surface cooperating with the third guide surface of the unlocking member to translate movement of the unlocking member in the second direction into movement thereof in the first direction to release the unlocking member from connection with the transmission member.

7. The handheld device of claim 1 wherein the transmission member comprises a pull rod and a slider connected to a distal end of the pull rod; the rack has a slide groove extending in the second direction, and the slider is slidably fitted in the slide groove.

8. The handheld device of claim 7 wherein the length of the chute is greater than or equal to the firing stroke of the rack and the length of the pull rod is greater than or equal to the firing stroke of the rack.

9. The handheld device of claim 7 wherein a proximal end of the transmission member is provided with a through hole that allows the pull rod to slidably pass through and retain the slider within the sliding slot of the rack.

10. The handheld device of any one of claims 1 to 9 wherein the handle assembly further comprises a battery pack, the battery pack having a pull hook for engaging the transmission member, the handle housing of the handle assembly having an opening at a proximal end thereof, the battery pack and the pull hook engaging in the opening.

11. A surgical instrument comprising a hand-held device according to any one of claims 1 to 10, further comprising an elongate body assembly disposed at a distal end of the handle assembly, an end effector being removably mounted at the distal end of the elongate body assembly.

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