The disclosure relates generally to surgical instruments, and more particularly, to a laparoscopic tissue cutting device.
Minimally invasive surgical procedures, including endoscopic, laparoscopic, and arthroscopic procedures, have been used for introducing surgical instruments inside a patient and for viewing portions of the patient's anatomy. Forming a relatively small diameter, temporary pathway to the surgical site is a key feature of most minimally invasive surgical procedures. The most common method of providing such a pathway is by inserting a trocar cannula assembly through the skin. The trocar cannula assembly may include an expandable balloon configured to enhance securement of the trocar cannula assembly in an opening in tissue.
When compared to the larger openings typically found in traditional procedures, both trauma to the patient and recovery time are reduced for procedures involving small openings. However, minimally invasive surgery has several limitations. In particular, surgery of this type including, e.g., cutting of tissue, requires a great deal of skill in manipulating the long narrow endoscopic instruments to a remote site under endoscopic visualization. Therefore, there is a need in the art for an improved surgical instrument for cutting tissue.
In accordance with the disclosure, a tissue cutting device includes an elongate shaft assembly, an actuation assembly, and a blade assembly. The elongate shaft assembly includes an elongate shaft defining first and second lumens and a support extending distally from the elongate shaft. The actuation assembly includes a pivoting rod slidably extending through the first lumen and an axial rod slidably extending through the second lumen of the elongate shaft. The blade assembly includes a blade to cut tissue and a body supporting the blade. The body includes a camming portion slidably engaging the support of the elongate shaft assembly. The body is operatively coupled to the pivoting rod and the axial rod of the actuation assembly. A first axial displacement of the axial rod pivots the blade between a closed configuration, in which, a distal portion of the blade engages the support of the elongate shaft assembly, and an open configuration, in which, the blade is pivoted to receive tissue between the blade and the support. A second axial displacement of the axial rod imparts concomitant axial displacement to the blade assembly to cut tissue.
In an aspect, the actuation assembly may further include a spring operatively associated with the pivoting rod to bias the axial rod towards a distal-most position.
In another aspect, the support of the elongate shaft assembly may have a planar portion and an arcuate portion conforming to a curvature of the elongate shaft.
In yet another aspect, the planar portion may define a groove having first and second portions. The first portion may be configured to receive the distal portion of the blade. The second portion may be configured to receive the camming portion of the body of the blade assembly.
In still yet another aspect, the second lumen of the elongate shaft may be in communication with the groove of the planar portion.
In still yet another aspect, the second lumen of the elongate shaft may be axially aligned with the groove of the planar portion.
In still yet another aspect, the first lumen of the elongate shaft may be radially spaced apart from the second lumen of the elongate shaft.
In an aspect, the second portion of the groove may be in superposed relation with the first portion of the groove.
In another aspect, the support of the elongate shaft assembly may have a semicylindrical shape.
In yet another aspect, the blade may have a substantially L-shaped profile.
In an aspect, the blade may have an arcuate portion to engage tissue.
In accordance with another aspect of the disclosure, a tissue cutting device includes an elongate shaft assembly, an actuation assembly, and a blade assembly. The elongate shaft assembly includes an elongate shaft and a support extending distally from the elongate shaft. The actuation assembly includes a pivoting rod and an axial rod slidably extending through the elongate shaft. The pivoting rod is in superposed relation with the axial rod. The blade assembly includes a blade having a pointed tip and a body supporting the blade and slidably engaging the support of the elongate shaft assembly. The body is operatively coupled to the pivoting rod and the axial rod such that axial displacement of the axial rod pivots the blade to pierce through tissue and imparts axial displacement to the blade to cut tissue.
In an aspect, the blade may have an arcuate shape.
In another aspect, the blade assembly may be pivotable between an aligned position, in which, the blade assembly is aligned with the elongate shaft, and an offset position, in which, the blade assembly is offset from the elongate shaft.
In yet another aspect, the pivoting rod of the actuation assembly may be coupled to a spring to bias the blade towards an open configuration.
In still yet another aspect, the support may have a semicylindrical shape.
In an aspect, the support may define a groove to slidably receive a portion of the body of the blade assembly therein.
In another aspect, the body may include a pivot pin extending traversely outwards to pivotably engage bores defined in a distal portion of the pivoting rod and may define a bore to receive a support pin of the axial rod therein.
In accordance with yet another aspect of the disclosure, a tissue cutting device includes an elongate shaft assembly, an actuation assembly, and a blade assembly. The elongate shaft assembly includes a shaft and a support extending distally from the shaft. The actuation assembly includes a pivoting rod and an axial rod slidably extending through the shaft of the elongate shaft assembly. The blade assembly includes a blade configured to cut tissue and a body supporting the blade. The body is operatively coupled to the axial rod such that axial displacement of the axial rod of the actuation assembly pivots the blade to pierce through tissue and imparts axial displacement to the blade to cut tissue.
In an aspect, axial displacement of the axial rod may pivot the blade assembly about a pivot disposed on the body and the axial rod may be coupled to the body at the pivot.
A tissue cutting device is disclosed herein with reference to the drawings, wherein:
A laparoscopic tissue cutting device is described in detail with reference to the drawings, wherein like reference numerals designate corresponding elements in each of the several views. As used herein, the term “distal” refers to that portion of the instrument, or component thereof which is farther from the user while the term “proximal” refers to that portion of the instrument or component thereof which is closer to the user. In addition, the terms parallel and perpendicular are understood to include relative configurations that are substantially parallel and substantially perpendicular up to about + or −10 degrees from true parallel and true perpendicular. Further, to the extent consistent, any or all of the aspects detailed herein may be used in conjunction with any or all of the other aspects detailed herein.
The support 160 of the elongate shaft assembly 150 includes an engaging portion 161 configured to operatively engage the blade assembly 250 of the tool assembly 200, and an arcuate portion 162 conforming to a curvature of the shaft 152 to facilitate insertion through, e.g., an opening in tissue or a lumen 1510 (
The body 254 of the blade assembly 250 has the camming portion 258 configured to be slidably received in the second portion 168b of the groove 166 of the support 160 for axial displacement through the second portion 168b of the groove 166. The neck portion 270 supports a blade 275 configured to cut tissue. The blade 275 includes an elongate portion 275a and a distal portion 275b. The elongate portion 275a of the blade 275 extends along a length of the neck portion 270. The distal portion 275b extends towards the distal tip portion 252 of the blade assembly 250 such that the distal portion 275b is substantially orthogonal to the elongate portion 275a. Under such a configuration, the blade 275 defines a substantially L-shaped or hook profile to facilitate cutting of tissue. In particular, the distal portion 275b of the blade 275 may be tapered to facilitate insertion thereof into tissue. The elongate portion 275a and the distal portion 275b may be connected to define a curvature to further facilitate cutting of tissue. The distal tip portion 252 is configured to be received through the first portion 168a of the groove 166 of the support 160.
Initially, an incision is made in a body wall to gain entry to a body cavity, such as the abdominal cavity. The distal portion 1502 of the cannula member 1500 is inserted through the incision. At this time, the body cavity may be insufflated with CO2, a similar gas, or another insufflation fluid. Surgical instruments may be inserted through the cannula assembly 1000 to perform desired surgical procedures. During the surgical procedure, the tissue cutting device 100 may be inserted through the cannula assembly 1000 to cut tissue. In particular, the tool assembly 200 of the tissue cutting device 100 is placed in the closed configuration to facilitate insertion through the cannula assembly 1000. After the tool assembly 200 is inserted through the incision and placed within the body cavity “BC,” the tool assembly 200 is placed adjacent target tissue “T”. Thereafter, the tool assembly 200 is transitioned to the open configuration to receive tissue “T” between the support 160 of the elongate shaft assembly 150 and the blade assembly 250. Thereafter, the axial rod 350 is retracted such that the distal tip portion 252 of the blade assembly 250 pierces through tissue “T”. Thereafter, the axial rod 350 is further retracted to slice tissue disposed on the support 160. The clinician may repeat this process as needed to cut tissue “T”.
It is further contemplated that the cannula assembly 1000 may be used with an obturator. The obturator generally includes a head portion having latches configured to engage respective notches defined in the cannula housing 1100 of the cannula assembly 1000 to enhance securement therewith, an elongate shaft extending from the head portion, and an optical penetrating tip coupled to a distal end of the elongate shaft. The optical penetrating tip may be used to penetrate the skin and access the body cavity. By applying pressure against the proximal end of the obturator, the tip of the obturator is forced though the skin and the underlying tissue layers until the cannula and obturator enter the body cavity.
It is also envisioned that the actuation assembly 350 may be operatively coupled to a handle assembly known by one skilled in the art to enable the clinician to actuate the tool assembly 200. It is contemplated that the handle assembly may be a powered or electromechanical handle assembly. It is further envisioned that the tissue cutting device 100 may be configured to connect to a robotic arm of a robotic surgical system to enable manipulation and control thereof. It is to be understood, therefore, various other changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the disclosure.
While the disclosure has 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. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.
This application claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 63/126,609, filed on Dec. 17, 2020, the entire disclosure of which is incorporated by reference herein.
Number | Date | Country | |
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63126609 | Dec 2020 | US |