# Patent

## Title
Apparatus for performing an electrosurgical procedure

## Abstract

An endoscopic forceps includes a housing having a shaft extending therefrom for treating tissue. A longitudinal axis is defined through the shaft. An end effector assembly is operably coupled to a distal end of the shaft and includes a pair of first and second jaw members. A rotating assembly operably coupled to the shaft is configured to rotate the shaft and the end effector about the longitudinal axis. A drive assembly is configured to selectively and releasably engage the rotating assembly. Engagement of the rotating assembly with the drive assembly couples the rotating assembly to the shaft such that the shaft is rotatable about the longitudinal axis in a predetermined direction when the rotating assembly is rotated. And, disengagement of the rotating assembly from the drive assembly uncouples the rotating assembly from the shaft such that the shaft is non-rotatable about the longitudinal axis when the rotating assembly is rotated.

## Background
This application is a continuation application of U.S. patent application Ser. No. 13/111,642, filed on May 19, 2011, the entire contents of which are hereby incorporated herein by reference.


BACKGROUND
The present disclosure relates to an apparatus for performing an electrosurgical procedure. More particularly, the present disclosure relates to an endoscopic forceps including a shaft and a rotating assembly that is releasably and selectively engageable with a drive assembly of an endoscopic for rotating the shaft when the rotating assembly is rotated.
DESCRIPTION OF RELATED ART
Electrosurgical instruments, e.g., endoscopic forceps, are well known in the medical arts and typically include a housing, a handle assembly including a movable handle, a shaft and an end effector assembly attached to a distal end of the shaft. The end effector includes jaw members configured to manipulate tissue (e.g., grasp and seal tissue). Typically, the endoscopic forceps utilizes both mechanical clamping action and electrical energy to effect hemostasis by heating the tissue and blood vessels to coagulate, cauterize, seal, cut, desiccate, and/or fulgurate tissue. Usually, one or more driving mechanisms, e.g., a drive assembly including a drive element, is utilized to cooperate with one or more components operatively associated with the handle assembly to impart movement to one or both of the jaw members. To facilitate positioning the jaw members about tissue, the endoscopic forceps sometimes includes a rotating assembly. The rotating assembly is usually operably coupled to the shaft and configured such that rotation of the rotating assembly rotates the shaft including the jaw members thereon in a predetermined direction, e.g., approximately 180° in either a clockwise or counterclockwise direction.
Under certain surgical scenarios, it may prove advantageous to have the rotating assembly temporarily disabled. For example, after a surgeon has positioned tissue between the jaw members, the jaw members are typically approximated toward one another and locked into a clamping position via one or more suitable locking methods, e.g., the movable handle is moved into a locked position. In the clamping position, and with the rotating assembly enabled, there exists the possibility of the rotating assembly being inadvertently rotated, which, in turn, may result in the shaft including the jaw members rotating. As can be appreciated, inadvertent or unwanted rotation of the shaft and/or jaw members during an electrosurgical procedure may result in tissue being ineffectively electrosurgically treated, e.g., an ineffective thrombosis may be formed along a tissue seal.
SUMMARY
The present disclosure provides an endoscopic forceps. The endoscopic forceps includes a housing having a shaft extending therefrom for treating tissue. The shaft defines a longitudinal axis therethrough. An end effector assembly operably coupled to a distal end of the shaft includes a pair of first and second jaw members. A rotating assembly operably coupled to the shaft is configured to rotate the shaft including the end effector about the longitudinal axis. A drive assembly is configured to selectively and releasably engage the rotating assembly such that engagement of the rotating assembly with the drive assembly couples the rotating assembly to the shaft such that the shaft is rotatable about the longitudinal axis in a predetermined direction when the rotating assembly is rotated. And, disengagement of the rotating assembly from the drive assembly uncouples the rotating assembly from the shaft such that the shaft is non-rotatable about the longitudinal axis when the rotating assembly is rotated.
The present disclosure provides an endoscopic forceps. The endoscopic forceps includes a housing having a shaft extending therefrom for treating tissue. The shaft defines a longitudinal axis therethrough. An end effector assembly operably coupled to a distal end of the shaft includes a pair of first and second jaw members. A rotating assembly operably coupled to the shaft is configured to rotate the shaft including the end effector about the longitudinal axis. A drive assembly is configured to selectively and releasably engage the rotating assembly such that engagement of the rotating assembly with the drive assembly couples the rotating assembly to the shaft such that the shaft is rotatable about the longitudinal axis in a predetermined direction when the rotating assembly is rotated. And, disengagement of the rotating assembly from the drive assembly uncouples the rotating assembly from the shaft such that the shaft is non-rotatable about the longitudinal axis when the rotating assembly is rotated. A mandrel is coaxially positioned about an outer tube of the shaft and configured to support a proximal external gear wheel of the rotating assembly and the drive assembly thereon.



BRIEF DESCRIPTION OF THE DRAWING
Various embodiments of the present disclosure are described hereinbelow with references to the drawings, wherein:
FIG. 1 is a perspective view of an endoscopic forceps including a housing, a shaft, a handle assembly, a rotating assembly and an end effector assembly shown in an open configuration according to an embodiment of the present disclosure;
FIG. 2 is a partial, left perspective view of the endoscopic forceps of FIG. 1 shown with the housing removed to illustrate the rotating assembly in an engaged position;
FIG. 3 is a left perspective view illustrating the rotating assembly in a disengaged position;
FIG. 4 is schematic view of the rotating assembly in the engaged position; and
FIG. 5 is partial, left perspective view of an endoscopic forceps including a rotating assembly according to another embodiment of the present disclosure.



DETAILED DESCRIPTION
Detailed embodiments of the present disclosure are disclosed herein; however, the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
In the drawings and in the descriptions that follow, the term “proximal,” as is traditional, will refer to an end of a surgical instrument that is closer to the user, while the term “distal” will refer to an end of the surgical instrument that is farther from the user.
FIG. 1 shows in detail the operating features and inter-cooperating components of an endoscopic bipolar forceps generally identified as forceps 2. Briefly, forceps 2 is for use with various surgical procedures and includes: a housing 4, a rotating assembly 6, a trigger assembly 8, a switch 10, an electrosurgical cable 12 for connecting the forceps 2 to an electrosurgical generator (not shown), a drive assembly 30 (FIG. 2), a handle assembly 7, and an end effector assembly 14. These various components mutually cooperate to grasp, seal and divide tubular vessels and vascular tissues. For a more detailed description of the trigger assembly 8, switch 10, and electrosurgical cable 12, reference is made to commonly-owned U.S. Pat. No. 7,156,846 to Dycus et al. filed on Jun. 13, 2003.
With continued reference to FIG. 1, housing 4 includes housing halves 4a and 4b that include a plurality of interfaces (not explicitly shown) that are dimensioned to mechanically align and engage one another to form housing 4 and enclose the internal working components of forceps 2.
With reference to FIGS. 2 and 3, a latch 5 is configured to releasably engage a movable handle 9 of the handle assembly 7. With this purpose in mind, latch 5 operably and pivotably couples, via one or more suitable coupling methods, to an internal frame of the housing 4. In the illustrated embodiment, a pivot pin (not explicitly shown) operably couples to a corresponding aperture 11 that extends transversely through a proximal end 13 of the latch 5 for fixedly coupling the latch 5 to the internal frame of the housing 4.
One or more resilient members, e.g., a leaf spring 23, are operably coupled to the latch 5 and configured to bias the latch 5 in an upwardly direction (FIGS. 2 and 3). More particularly, a leaf spring 23 extends substantially along a length of an outer surface of the latch 5 (FIGS. 2 and 3) and provides an upward biasing force that urges the latch 5 upward.
A distal end 15 of the latch 5 includes a generally slanted bifurcated ramp portion 17 that is defined by individual ramp portions 17a and 17b (FIG. 2) that collectively define an opening 19 therebetween (FIGS. 2 and 3). The ramp portions 17a and 17b are configured to slidably engage corresponding locking pins 21a and 21b of a locking feature 21 operably coupled to the movable handle 9 (FIG. 2). Opening 19 is configured to receive an elongated portion 21c (FIG. 2) of the locking feature 21 therein (FIG. 3). Proximal ends of each of the ramp portions 17a and 17b are configured to releasably engage the corresponding locking pins 21a and 21b. More particularly, a generally elongated cavity 25 (shown phantomly in FIGS. 2 and 3) extends transversely along an interior of the latch 5 adjacent the proximal ends of the ramp portions 17a and 17b. To facilitate engaging and disengaging the locking pins 21a and 21b from the cavity 25, the cavity 25 includes a contour that corresponds to a contour of the locking pins 21a and 21b, i.e., cavity 25 includes a generally arcuate or concave configuration. The generally arcuate configuration of the contour 25 is exhibited on an exterior surface 3 (FIG. 3) at the proximal end of the latch 5 and is configured to contact the internal frame of the housing 4 to facilitate pivoting of the latch 5 about the internal frame of the housing 4.
Referring again to FIG. 1, forceps 2 includes a shaft 16 that defines a longitudinal axis “A-A” therethrough. Shaft 16 includes a distal end 18 configured to mechanically engage the end effector assembly 14 (FIG. 1) operably associated with the forceps 2 and a proximal end 20 that mechanically engages the housing 4 (FIG. 1). More particularly, the proximal end 20 of the shaft 16 is operably coupled to the internal frame of the housing 4 via a shaft mount 22, see FIG. 4 for example. Shaft mount 22 is operable to rotate with the shaft 12 and is fixed from translating by ribs (not explicitly shown) in the housing 4.
An outer sleeve or tube 45 (FIGS. 2 and 3) of suitable configuration is coaxially positioned about the shaft 16 and is configured to rotate the shaft 16 when the rotating assembly 6 is rotated. The outer tube 45 is configured to provide a mechanical interface between the shaft 16 and rotating assembly 6 when the rotating assembly 6 is in an engaged or “ready” position such that rotation of the rotating assembly 6 rotates the shaft 16 including the first and second jaw members 39 and 40 (FIG. 1). The outer sleeve 45 includes proximal and distal flanges 46 (FIGS. 2-4) and 47 (FIG. 4), respectively. The proximal flange 46 is configured to contact a proximal clip 44, e.g., an e-clip, that is operably coupled to a mandrel 41 (FIGS. 2-4). Likewise, the distal flange 47 is configured to contact a distal clip 43, e.g., an e-clip, that is operably coupled to mandrel 41 (FIG. 4). Utilizing e-clips for the proximal and distal clips 44 and 43 facilitates positioning a pre-compressed spring 33 therebetween.
Mandrel 41 (FIGS. 2-4) is coaxially positioned about the outer tube 45 of the shaft 16 and supports the rotating assembly 6 and the drive assembly 30 thereon. Mandrel 41 is configured move longitudinally along the outer tube 45 when the movable handle 9 is moved. To this end, mandrel 41 includes a proximal flange 42 (FIGS. 2-4) that is configured to contact a proximal end of spring 33 (FIGS. 2-4) such that the spring 33 compresses thereagainst when the movable handle 9 is moved proximally. A proximal surface of the proximal flange 42 is configured to contact proximal clip 44, FIGS. 2-4. The proximal clip 44 prevents the proximal flange 42 of the mandrel 41 from translating past the proximal flange 46 of the outer tube 45 when the movable handle 9 is moved proximally. That is, the mandrel 41 and/or outer tube 45 are prevented from moving into contact with the shaft mount 22 when the movable handle 9 is moved proximally.
With reference to FIGS. 2-4, shaft mount 22 is illustrated. Shaft mount 22 is fixedly coupled to the internal frame of the housing 4 via one or more suitable coupling methods, e.g., soldering, brazing, ultrasonic welding. In particular, a proximal end 24 (FIGS. 2-4) of the shaft mount 22 includes a generally circumferential configuration and is ultrasonically welded to the internal frame of the housing 4. Shaft mount 22 is configured to allow rotation of the shaft 16 thereabout while maintaining the shaft 16 fixed in orientation about the longitudinal axis “A-A” when the rotating assembly 6 is rotated and/or the movable handle 9 is moved proximally, as described in more detail below. With this purpose, a generally elongated distal end 26 of the shaft mount 22 includes an opening of suitable configuration that is configured to rotatably receive the proximal end 20 of the shaft 16 therein (FIGS. 2-4).
Referring again to FIG. 1, handle assembly 7 includes a fixed handle 28 and movable handle 9. In one particular embodiment, fixed handle 28 is integrally associated with housing 4. Movable handle 9 of handle assembly 7 is ultimately connected to drive assembly 30 (see FIGS. 2-4, for example) to impart movement of the respective first and second jaw members 39 and 40 from the open position (FIG. 1), wherein the first and second jaw members 39 and 40 are disposed in spaced relation relative to one another, to a clamping or closed position (FIG. 3) wherein the first and second jaw members 30 and 40 cooperate to grasp tissue therebetween.
Movable handle 9 is selectively movable about a pivot pin 32 (FIGS. 2 and 3) from a first position relative to fixed handle 28, to a second position in closer proximity to the fixed handle 28 that imparts movement of the first and second jaw members 39 and 40 relative to one another. Proximal movement of the movable handle 9 past a predetermined point places the movable handle 9 in a locked or “latched” position, wherein the first and second jaw members 39 and 40 are maintained in the clamping position. More particularly, when the movable handle 9 is moved proximally a predetermined distance, the locking pins 21a and 21b of a locking feature 21 slidably engage the corresponding ramp portions 17a and 17b, which, in turn, pivots the latch 5 about the pivot pin and the internal frame of the housing 4 against the biasing force of the leaf spring 23. Continued proximal movement of the movable handle 9, causes the locking pins 21a and 21b to engage the cavity 25, which, in turn, maintains the movable handle 9 in a “latched” or locked state (FIG. 3). To release or “unlock” the movable handle 9 from the locked position, the movable handle 9 is moved proximally past the locked position through a release stroke. More particularly, to release the movable handle 9 from the “latched” position, the movable handle 9 is moved proximally through the release stroke to disengage the locking pins 21a and 21b from the cavity 25.
With reference again to FIGS. 2 and 3, the movable handle 9 includes a clevis 34 that forms a pair of flanges, e.g., right upper flange 36a and left upper flange 36b. Unless otherwise stated, it is to be understood that the left upper flange 36b includes the same components and is configured to function similar to that of right upper flange 36a. Right upper flange 36a has an aperture (not explicitly shown) at an upper end thereof for receiving pivot 32 therethrough and mounting the upper end of the movable handle 9 to the housing 4. Upper flange 36a includes a drive flange 37a that is aligned along longitudinal axis “A-A” (see FIGS. 2 and 3) and which abuts the drive assembly 30 such that pivotal movement of the movable handle 9 forces the drive flange 37a proximally against the bias of the spring 33, which, in turn, closes and tensions the first and second jaw members 39 and 40, see FIG. 3.
Continuing with reference to FIGS. 2-4, drive assembly 30 is illustrated. Drive assembly 30 includes proximal and distal collars 48 and 49, respectively. Each of the respective proximal and distal collars 48 and 49 is configured to contact the drive flanges 37a and 37b of the movable handle 9 (FIGS. 2 and 3). Moreover, proximal collar 48 is configured to contact a distal end of the spring 33. The distal end of the spring 33 biases or forces the distal collar 49 against the rotating assembly 6 when the movable handle 9 is in the unlatched position, see FIGS. 2 and 4. In particular, drive assembly 30 is configured to selectively and releasably engage the rotating assembly 6 such that engagement of the rotating assembly 6 with the drive assembly 30 couples the rotating assembly 6 to the shaft 16.
More particularly, when the drive assembly 30 and the rotating assembly 6 are engaged with one another, the rotating assembly 6 and shaft 16 are coupled to one another and the shaft 16 is rotatable about the longitudinal axis “A-A” in a predetermined direction when the rotating assembly 16 is rotated. And, when the rotating assembly 6 and the drive assembly 30 are disengaged from one another, the rotating assembly 6 and shaft 16 are uncoupled from one another and shaft is non-rotatable about the longitudinal axis when the rotating assembly is rotated. To these ends, a frictional interface is present between a proximal surface of the rotating assembly 6 and a distal surface of the distal collar 49 of the drive assembly 30. It is this frictional interface that allows the rotating assembly 6 to rotate the outer tube 45 and, thus, the shaft 16. To avoid “slippage” between the proximal surface of the rotating assembly 6 and the distal surface of the distal collar 49, the coefficient of static friction between these surfaces may range from about 0.2-1.05. As can be appreciated, the compression force provided by the spring 33 may be adjusted to provide any amount of frictional engagement. In accordance with the present disclosure, it has been found that the proximal surface of the rotating assembly 6 and the distal surface of the distal collar 49 may be made from or coated with rubber, steel, copper, brass, cast iron or combination thereof. In the illustrated embodiment, a thin layer of a suitable rubber is operably disposed on the proximal surface of rotating assembly 6 and the distal surface of the distal collar 49. The layers of rubber are in substantial alignment with each other such that in the engaged or “ready” condition the layers of rubber substantially contact one another and remain in contact with one another until the movable handle 9 is moved proximally.
The spring 33 is operably positioned about the mandrel 41 (FIGS. 2-4). More particularly, spring 33 is positioned between proximal collar 48 of the drive assembly 30 and proximal flange 42 of the mandrel 41. As noted above, the spring 33 is configured to bias the distal collar 49 of the drive assembly 30 into engagement with the rotating assembly 6. In the embodiment illustrated in FIGS. 1-4, the spring 33 is a compression spring. In certain embodiments, drive assembly 30 including the spring 33 is configured to provide a consisitent closure force on the first and second jaw members 39 and 40, respectively, in a range from about 3 kg/cm2 to about 16 kg/cm2 when the movable handle 9 is in the latched position.
Referring again to FIG. 1-4, rotating assembly 6 is illustrated including two halves 6a and 6b which, when assembled, form the rotating assembly 6. Rotating assembly 6 is integrally associated with the housing 4 and is rotatable in either a clockwise or counter clockwise direction about the longitudinal axis “A-A” (FIG. 1) to impart movement of the shaft 16 including the first and second jaw members 39 and 40. The rotating assembly 6 may be formed from any suitable material including but not limited to plastic, metal, etc. In the illustrated embodiment, the rotating assembly 6 is made from a relatively rigid plastic and, as noted above, includes a layer of suitable rubber on the proximal surface thereof. To facilitate rotation, a plurality of raised protrusions or detents is disposed along an outer peripheral edge of the rotating assembly 6.
Rotating assembly 6 is rotatably supported on the mandrel 41. Rotating assembly 6 is operably coupled to the shaft 16 via the outer tube 45. More particularly, when the distal collar 49 is forced or “pressed” against the rotating assembly 6, the rotating assembly 6 presses against the distal clip 43, which, in turn, presses against the distal flange 47 of the outer tube 45. This pressing of the distal flange 47 engages the outer tube 45 with the shaft 16 such that the shaft 16 is rotatable about the longitudinal axis “A-A” when the rotating assembly 6 is rotated. As can be appreciated, the combination of the rotating assembly 6 and distal collar 49 configured to press thereagainst is configured to function similar to that of a “clutch mechanism” typically utilized in an automobile
Referring again to FIGS. 1 and 3, first and second jaw members 39 and 40 are operatively and pivotably coupled to each other and located adjacent the distal end 18 of shaft 16. For illustrative purposes, the end effector 14 is shown including a unilateral jaw configuration, i.e., first jaw member 39 is movable with respect to second jaw member 40 that is non-movable or stationary with respect to first jaw member 39. In the illustrated embodiment, the first jaw member 39 is movable from a normally open configuration to the clamping configuration when the movable handle 9 is moved proximally, see FIGS. 1 and 3, respectively. Respective electrically conductive seal plates 50 and 52 are operably supported on and secured to jaw housings 54 and 56 of respective first and second jaw members 39 and 40, see FIG. 1.
In use, movable handle 9, initially, is in an unlocked or unlatched position. In the unlocked or unlatched position, the distal collar 49 of the drive assembly 30 is engaged with the rotating assembly 6 via the biasing force provided by the spring 33. As noted above, this engages the outer tube 45 with the shaft 16. To facilitate positioning tissue between the first and second jaw members 39 and 40, respectively, rotating assembly 6 may be rotated about the longitudinal axis “A-A.” With tissue is positioned between the first and second jaw members 39 and 40, movable handle 9 is moved proximally a predetermined distance to engage the locking member 21 with the latch 5. With the locking member 21 and latch 5 in the engaged condition, the first and second jaw members 39 and 40 remain in the clamping configuration.
In the engaged position, the drive assembly 30 is out of engagement with the rotating assembly 6, which, in turn, causes the rotating assembly 6 to move out of engagement with the distal flange 47 of the outer tube 45; this, in turn, uncouples the rotating assembly 6 from the shaft 16. With the rotating assembly 6 uncoupled from the shaft 16, rotation of the rotating assembly 6 results in the rotating assembly 6 spinning freely about the mandrel 41 (i.e., rotating assembly 6 is temporarily disabled) and the shaft 19 not rotating about the longitudinal axis “A-A.” As can be appreciated, with the rotating assembly 6 temporarily disabled during an electrosurgical procedure, the likelihood of inadvertent movement or rotation of the shaft 19 and/or first and second jaw members 39 and 40 is greatly diminished and/or eliminated.
From the foregoing, and with reference to the various figure drawings, those skilled in the art will appreciate that certain modifications can also be made to the present disclosure without departing from the scope of the same. For example, and with reference to FIG. 5, an endoscopic forceps 102 may include a rotating assembly 106 in operable communication with proximal external wheel 101a (gear wheel 101a) and distal external gear wheel 101b (gear wheel 101b). The endoscopic forceps 102 with the rotating assembly 106 is substantially similar to the endoscopic forceps 2 with the rotating assembly 6. As a result thereof, only those features unique to endoscopic forceps 102 with the rotating assembly 6 are described in detail.
Continuing with reference with FIG. 5, unlike rotating assembly 6, rotating assembly 106 is disposed at a distal end of the housing of the endoscopic forceps 102 and includes a generally conical configuration. Rotating assembly 106 is operably coupled to or includes gear wheel 101b and is configured such that rotation of the rotating assembly 106 in a predetermined direction rotates the gear wheel 101b while simultaneously rotating gear wheel 101a, as described in more detail below.
Gear wheel 101b is rotatably supported on an outer drive sleeve or tube 104 of the drive assembly 130. A plurality of teeth 105 is disposed on an outer peripheral edge of the gear wheel 101b. Gear wheel 101b is in operable communication with the gear wheel 101a via a coupling rod 103.
Coupling rod 103 operably couples to the rotating assembly 106 via a bushing and pin configuration (not shown) that is configured to allow coupling rod 103 to rotate with respect to the rotating assembly 106. That is, the bushing and pin configuration allows the coupling rod 103 to rotate with respect to the gear wheel 101b and the rotating assembly 6 as the rotating assembly 6 is rotated. Coupling rod 103 includes proximal and distal pluralities of teeth 103a and 103b. The plurality of teeth 103b is configured to mesh with the plurality of teeth 105 on the gear wheel 101b. Similarly, the plurality of teeth 103a is configured to mesh with a plurality of teeth 107 on the gear wheel 101a. 
Gear wheel 101a functions similar to rotating assembly 6 in that gear wheel 101a is positioned between the distal collar 149 of the drive assembly 130 and a distal flange 142 of the outer tube 145. Gear wheel is disposed within the confines of the housing of the endoscopic forceps 102.
In use, the movable handle (not explicitly shown), initially, is in an unlocked or unlatched position. In the unlocked or unlatched position, the distal collar 149 of the drive assembly 130 is engaged with the gear wheel 101a via the biasing force provided by the spring 133. As noted above, this engages the outer tube 145 with the shaft 116. To facilitate positioning tissue between the first and second jaw members 39 and 40, respectively, rotating assembly 106 may be rotated about the longitudinal axis “A-A.” Rotating the rotating assembly 106 rotates the gear wheel 101b, which, in turn, rotates the coupling rod 103 and the gear wheel 101a. With tissue positioned between the first and second jaw members 39 and 40, the movable handle is moved proximally a predetermined distance to the locked position. As can be appreciated, with the movable handle in the locked position, the drive assembly 130 is out of engagement with the gear wheel 101a, which, in turn, causes the gear wheel 101a to move out of engagement with the distal flange 147 of the outer tube 145; this, in turn, uncouples the rotating assembly 106 from the shaft 116. With the rotating assembly 106 uncoupled from the shaft 116, rotation of the rotating assembly 106 results in the rotating assembly 106 including coupling rod 103 and the gear wheels 101a and 101b spinning “freely” about the outer drive tube 104 and/or the mandrel 141 (i.e., rotating assembly 106 is temporarily disabled) and the shaft 19 not rotating about the longitudinal axis “A-A.”
While several embodiments of the disclosure have been shown in the drawings, it is not intended that the disclosure be limited thereto, as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise. Therefore, the above description should not be construed as limiting, but merely as exemplifications of particular embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.

## Claims

1. A surgical instrument, comprising:
a housing having a shaft extending therefrom, the shaft defining a longitudinal axis therethrough;
an end effector assembly operably coupled to a distal end of the shaft;
a rotating assembly operably coupled to the shaft and configured to rotate the shaft; and
a drive assembly configured to selectively engage the rotating assembly, wherein engagement of the rotating assembly with the drive assembly couples the rotating assembly to the shaft such that the shaft is rotatable about the longitudinal axis when the rotating assembly is rotated, and wherein the drive assembly is configured to selectively disengage from the rotating assembly by uncoupling the rotating assembly from the shaft rendering the shaft unrotatable relative to the housing.

2. A surgical instrument according to claim 1, wherein the shaft includes an outer tube and the rotating assembly includes a mandrel coaxially positioned around the outer tube that is configured to support the rotatable assembly and the drive assembly thereon.

3. A surgical instrument according to claim 2, wherein the drive assembly includes a proximal collar and a distal collar and the rotating assembly is positioned between the distal collar of the drive assembly and a distal clip operably disposed on the mandrel.

4. A surgical instrument according to claim 3, wherein a spring is positioned between the proximal collar of the drive assembly and a proximal flange of the mandrel, the spring configured to at least bias the distal collar of the drive assembly into engagement with the rotating assembly.

5. A surgical instrument according to claim 4, wherein the end effector assembly includes first and second jaw members, at least one of the first and second jaw members movable relative to the other from an open position, wherein the first and second jaw members are disposed in spaced relation relative to one another, to a clamping position, wherein the first and second jaw members cooperate to grasp tissue therebetween.

6. A surgical instrument according to claim 5, wherein the spring is a compression spring that cooperates with the drive assembly to provide a closure force on the first and second jaw members in the range from about 3 kg/cm2 to about 16 kg/cm2 when the movable handle is in the latched position.

7. A surgical instrument according to claim 3, wherein the drive assembly is operably coupled to a movable handle associated with the housing, the drive assembly configured such that a predetermined amount of proximal movement of the movable handle moves the distal collar of the drive assembly out of engagement with the rotating assembly such that the rotating assembly spins freely about the mandrel when rotated.

8. A surgical instrument according to claim 7, wherein a shaft mount operably couples to the housing and the shaft, the shaft mount configured to allow rotation of the shaft thereabout when the rotating assembly is rotated and configured to prevent translation of the shaft along the longitudinal axis when the movable handle is moved proximally.

9. A surgical instrument according to claim 7, further comprising a latch configured to releasably engage the movable handle, the latch operably coupled to an internal frame of the housing.

10. A surgical instrument according to claim 9, wherein the latch is pivotably coupled to the internal frame of the housing and includes a resilient member configured to bias the latch in a direction towards the shaft.

11. A surgical instrument according to claim 10, wherein the resilient member is a leaf spring.

12. A surgical instrument according to claim 9, wherein a locking feature is operably coupled to a proximal end of the movable handle and is configured to selectively and releasably engage the latch.

13. A surgical instrument, comprising:
an end effector assembly;
a rotating assembly operably coupled to the end effector assembly and configured to rotate the end effector assembly; and
a drive assembly operably coupled to the end effector assembly and configured to selectively engage the rotating assembly, wherein engagement of the rotating assembly with the drive assembly couples the rotating assembly to the end effector assembly such that the end effector assembly is rotated when the rotating assembly is rotated, wherein the drive assembly is configured to selectively disengage the rotating assembly rendering the end effector assembly unrotatable relative to the housing.

14. A surgical instrument according to claim 13, further including an outer tube, wherein the rotating assembly includes a mandrel coaxially positioned around the outer tube that is configured to support the rotatable assembly and the drive assembly thereon.

15. A surgical instrument according to claim 14, further comprising a coupling rod including proximal and distal external gear wheels disposed thereon, the proximal external gear wheel of the coupling rod configured to mesh with a proximal external gear wheel of the rotating assembly, and the distal external gear wheel of the coupling rod configured to mesh with a distal external gear wheel of the rotating assembly such that rotation of the rotating assembly rotates the end effector assembly.

16. A surgical instrument according to claim 15, wherein the drive assembly includes a proximal collar and a distal collar and the mandrel includes a distal clip and wherein the proximal external gear wheel of the rotating assembly is positioned between the distal collar of the drive assembly and the distal clip.

17. A surgical instrument according to claim 16, wherein a spring is positioned between the proximal collar of the drive assembly and a proximal flange of the mandrel, the spring configured to at least bias the distal collar of the drive assembly into engagement with the proximal external gear wheel of the rotating assembly.

18. A surgical instrument according to claim 13, wherein the end effector assembly includes first and second jaw members, at least one of the first and second jaw members movable relative to the other jaw member from an open position, wherein the first and second jaw members are disposed in spaced relation relative to one another, to a clamping position, wherein the first and second jaw members cooperate to grasp tissue therebetween.

19. A surgical instrument, comprising:
an end effector assembly;
a rotating assembly operably coupled to the end effector assembly and configured to rotate the end effector assembly;
a drive assembly operably coupled to the end effector assembly and configured to selectively engage the rotating assembly, wherein engagement of the rotating assembly with the drive assembly couples the rotating assembly to the end effector assembly such that the end effector assembly is rotated when the rotating assembly is rotated, the rotating assembly including a mandrel coaxially positioned around an outer tube configured to support the rotatable assembly and the drive assembly thereon; and
a coupling rod including proximal and distal external gear wheels disposed thereon, the proximal external gear wheel of the coupling rod configured to mesh with a proximal external gear wheel of the rotating assembly, and the distal external gear wheel of the coupling rod configured to mesh with a distal external gear wheel of the rotating assembly such that rotation of the rotating assembly rotates the end effector assembly.

20. A surgical instrument, comprising:
a housing having a shaft extending therefrom, the shaft defining a longitudinal axis therethrough;
an end effector assembly operably coupled to a distal end of the shaft;
a rotating assembly operably coupled to the shaft and configured to rotate the shaft; and
a drive assembly configured to selectively engage the rotating assembly, wherein engagement of the rotating assembly with the drive assembly couples the rotating assembly to the shaft such that the shaft is rotatable about the longitudinal axis when the rotating assembly is rotated, and wherein the drive assembly includes a proximal collar and a distal collar and the rotating assembly is positioned between the distal collar of the drive assembly and a distal clip operably disposed on the mandrel and wherein the shaft includes an outer tube and the rotating assembly includes a mandrel coaxially positioned around the outer tube that is configured to support the rotatable assembly and the drive assembly thereon.

21. A surgical instrument according to claim 20, wherein a spring is positioned between the proximal collar of the drive assembly and a proximal flange of the mandrel, the spring configured to at least bias the distal collar of the drive assembly into engagement with the rotating assembly.

22. A surgical instrument according to claim 21, wherein the end effector assembly includes first and second jaw members, at least one of the first and second jaw members movable relative to the other from an open position, wherein the first and second jaw members are disposed in spaced relation relative to one another, to a clamping position, wherein the first and second jaw members cooperate to grasp tissue therebetween.

23. A surgical instrument according to claim 22, wherein the spring is a compression spring that cooperates with the drive assembly to provide a closure force on the first and second jaw members in the range from about 3 kg/cm2 to about 16 kg/cm2 when the movable handle is in the latched position.

24. A surgical instrument according to claim 20, wherein the drive assembly is operably coupled to a movable handle associated with the housing, the drive assembly configured such that a predetermined amount of proximal movement of the movable handle moves the distal collar of the drive assembly out of engagement with the rotating assembly such that the rotating assembly spins freely about the mandrel when rotated.

25. A surgical instrument according to claim 24, wherein a shaft mount operably couples to the housing and the shaft, the shaft mount configured to allow rotation of the shaft thereabout when the rotating assembly is rotated and configured to prevent translation of the shaft along the longitudinal axis when the movable handle is moved proximally.

26. A surgical instrument according to claim 24, further comprising a latch configured to releasably engage the movable handle, the latch operably coupled to an internal frame of the housing.

27. A surgical instrument according to claim 26, wherein the latch is pivotably coupled to the internal frame of the housing and includes a resilient member configured to bias the latch in a direction towards the shaft.

28. A surgical instrument according to claim 27, wherein the resilient member is a leaf spring.

29. A surgical instrument according to claim 26, wherein a locking feature is operably coupled to a proximal end of the movable handle and is configured to selectively and releasably engage the latch.