Multi-diameter cannula depth limiter

Abstract

A depth limiter is provided that is configured to couple with first and second trocar cannulas having different diameters. The depth limiter includes first and second body portions. The first and second body portions each include first and second gripping surfaces. The first and second body portions are pivotably coupled together and movable between an open configuration and a closed configuration. In the open configuration, the first and second body portions are configured to allow axial movement of the depth limiter relative to the first and second trocar cannulas. The first gripping surfaces of the first and second body portions are configured to limit axial movement of the depth limiter relative to the first trocar cannula in the closed configuration. The second gripping surfaces of the first and second body portions are configured to limit axial movement of the depth limiter relative to the second trocar cannula in the closed configuration.

Description

[0001] Priority

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 018,601, entitled “Multi-Diameter Cannula Depth Limiter” and filed on May 1, 2020, the disclosure of which is incorporated by reference herein. BACKGROUND

[0003] Some surgical procedures can require a clinician to access a surgical site via a patient’s abdominal cavity. To gain such access, an opening is first formed through the abdominal wall tissue that overlies the abdominal cavity. In some surgical procedures, referred to as “laparoscopic” or “endoscopic” surgical procedures, a relatively small opening is formed through the abdominal wall tissue, and then an elongated instrument is used to access the surgical site, the elongated instrument being inserted through an access device, commonly referred to as a “trocar,” that is positioned within the opening. A conventional trocar generally includes a cannula assembly and a obturator that is removably received within a working channel of the cannula assembly. In use, the obturator cooperates with the cannula assembly, and the combined structure (i.e., the trocar) is directed downward by the clinician through the patient’s abdominal wall so that the distal end of the obturator and cannula assembly extends into the abdominal cavity. The clinician then withdraws the obturator from the cannula assembly so that a surgical instrument can be directed downward through the working channel of the cannula assembly to access the surgical site.

[0004] The following patents disclose cannulas, their components, and other types of surgical access devices only as exemplary models: U.S. Patent 7,981,092, entitled "Vibratory Trocar," published July 19, 2011; U.S. Patent 8,226,553, entitled "Access Device with Insert," published July 24, 2012; U.S. Patent 8,251,900, entitled "Surgical Access Devices and Methods Providing Seal Movement in Predefined Paths," published August 28, 2012; U.S. Patent 8,579,807, entitled "Absorbing Fluids in a Surgical Access Device," published November 12, 2013; U.S. Patent 8,568,362, entitled "Surgical Access Device with Sorbents," published October 29, 2013; and U.S. Patent 8,568,362, entitled "Surgical Access Device with Sorbents," published January 28, 2014. U.S. Patent 8,636,686, entitled “Device”; U.S. Patent 8,690,831, entitled “Gas Jet Fluid Removal in a Trocar”, published April 8, 2014; and U.S. Patent 2019 / 0000496, entitled “Method of Suturing a Trocar Path Incision”, published January 3, 2019. The disclosure of each of the above-cited U.S. patents and publications is incorporated herein by reference.

[0005] Although various surgical instruments, including surgical access devices and end effectors, and other associated components have been manufactured and used, it is believed that no one has manufactured or used the invention described in the appended claims prior to one or more inventors. Attached Figure Description

[0006] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0007] Figure 1 A perspective view of an exemplary cannula needle having a cannula assembly and a tampon shown in an assembled state is shown;

[0008] Figure 2 It is shown in the disassembled state. Figure 1side elevational view of the trocar and the depth limiter of the trocar assembly of

[0009] Figure 3A a clinician is shown manipulating Figure 1 a side cross-sectional view of the trocar of

[0010] Figure 3B a side cross-sectional view of the trocar of Figure 1 Figure 3A

[0011] Figure 3C a side cross-sectional view of the trocar of Figure 1 Figure 3A

[0012] Figure 3D a side cross-sectional view of the trocar of Figure 1 Figure 3A

[0013] Figure 4 a perspective view of another example trocar having a trocar assembly and a obturator shown in an assembled state, wherein the trocar assembly includes a trocar tube;

[0014] Figure 5 a perspective view of the trocar assembly and the obturator of Figure 4

[0015] Figure 6 a perspective view of the trocar of Figure 4

[0016] Figure 7 a perspective view of the depth limiter of Figure 6

[0017] Figure 8 a cross-sectional view of the depth limiter and the trocar tube of Figure 6 Figure 6

[0018] Figure 9A a perspective view of the trocar of Figure 7 ​​​​​​​​​​​a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user;

[0019] Figure 9B a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 9A

[0020] Figure 9C a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 9A

[0021] Figure 9D a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 9A Figure 5 a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user;

[0022] Figure 9E a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 9A

[0023] Figure 10 a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user;

[0024] Figure 11A a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 10

[0025] Figure 11B a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 11A

[0026] Figure 11C a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 11A

[0027] Figure 11D a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user; Figure 11A Figure 5 a depth limiter of the'1 12 patent and a top plan view of an exemplary cannula tube shown in cross-section, wherein the depth limiter is in an open configuration that allows axial movement of the depth limiter relative to the cannula tube when actuated by a user;​​​​​​​​

[0028] Figure 12 a perspective view of a fourth example depth limiter including four legs;

[0029] Figure 13 a perspective view of a fourth example depth limiter including four legs;

[0030] Figure 14A a partial side cross-sectional view of the depth limiter of Figure 1 coupled to a cannula tube of a trocar assembly of Figure 13 a partial side cross-sectional view of the depth limiter of

[0031] Figure 14B a partial side cross-sectional view of the depth limiter of Figure 1 coupled to a cannula tube of a trocar assembly of Figure 13 a partial side cross-sectional view of the depth limiter of

[0032] Figure 15 a perspective view of a fifth example depth limiter including two legs;

[0033] Figure 16 a perspective view of a sixth example depth limiter including three legs;

[0034] Figure 17 a perspective view of a seventh example depth limiter including a hub having a notch;

[0035] Figure 18A a partial side cross-sectional view of the depth limiter of Figure 5 coupled to a cannula tube of a trocar assembly of Figure 17 a top plan view of the depth limiter of

[0036] Figure 18B a partial side cross-sectional view of the depth limiter of Figure 5 coupled to a cannula tube of a trocar assembly of Figure 17 a partial side cross-sectional view of the depth limiter of

[0037] Figure 19A a partial side cross-sectional view of the depth limiter of Figure 5 coupled to a cannula tube of a trocar assembly of Figure 17 a partial side cross-sectional view of the depth limiter of

[0038] Figure 19B a partial side cross-sectional view of the depth limiter ofFigure 5 The cannula connection of the cannula assembly. Figure 17 A partial side sectional view of the depth limiter, wherein the legs of the depth limiter are in an extended configuration; and

[0039] Figure 20 A top cross-sectional view of an eighth exemplary depth limiter, including a fluid chamber and four legs, is shown.

[0040] The accompanying drawings are not intended to be limiting in any way, and various embodiments of the invention can be conceived to be implemented in many other ways, including those not necessarily shown in the drawings. The drawings, which are incorporated in and constitute a part of this specification, illustrate several aspects of the invention and, together with the description, serve to explain the principles of the invention; however, it should be understood that the invention is not limited to the explicit arrangements shown. Detailed Implementation

[0041] The following description of certain examples of the invention is not intended to limit the scope of the invention. Other examples, features, aspects, embodiments, and advantages of the invention will be apparent to those skilled in the art from the following description, which is shown by way of example, and a preferred mode is contemplated for carrying out the invention. It will be appreciated that the invention can have other different and obvious aspects, all of which are not departing from the invention. Therefore, the drawings and descriptions should be regarded as substantially illustrative and not restrictive.

[0042] For clarity of disclosure, the terms "proximal" and "distal" are defined herein in relation to the surgeon or other operator who grasps the surgical device. The term "proximal" refers to a position where the element is positioned closer to the surgeon, and the term "distal" refers to a position where the element is positioned further away from the surgeon. Furthermore, the extent to which spatial terms such as "top," "bottom," "upper," "lower," "vertical," and "horizontal" are used herein with reference to the accompanying drawings should be understood to be for illustrative purposes only and not intended to be limiting or absolute. In this regard, it should be understood that surgical instruments such as those disclosed herein may be used in a variety of orientations and positions, not limited to those shown and described herein.

[0043] Furthermore, the terms “about” and “approximately” used herein in connection with any numerical value or range are intended to cover the exact value referenced, as well as the appropriate tolerance that enables the referenced feature or combination of features to be used for the intended purpose described herein.

[0044] I. Exemplary single-use trocars and reusable trocars

[0045] Figures 1-5Exemplary surgical access devices are shown in the form of a single-use first cannula (10) and a reusable second cannula (110), each cannula configured to provide surgical site access in laparoscopic surgery. Each cannula (10, 110) includes an insertion assembly (12, 112) having a working channel (14, 114) and a tampon (16, 116) configured to be removably and coaxially inserted into the working channel (14, 114) such that the assembled cannula (10, 110) can be guided distally through the patient's abdominal wall and into the abdominal cavity, for example, as described below. Figures 3A-3D As stated above.

[0046] A. Exemplary single-use trocars

[0047] like Figures 1-2 As shown, the cannulation assembly (12) of a single-use trocar (10) includes a cannula (20) and a sealing housing (30). The cannula (20) and the sealing housing (30) cooperate to define a working channel (14) that extends longitudinally along the central axis (A) of the trocar (10). Specifically, the working channel (14) is defined by the lumen of the cannula (20) communicating with the hollow interior of the sealing housing (30). The cannulation assembly (12) is configured to receive elongated surgical instruments distally through the working channel (14) to provide access to surgical sites within the patient's abdominal cavity. As described in more detail below, the sealing housing (30) houses a pair of sealing structures that define a sealing assembly configured to retain airflow into the patient's abdominal cavity while allowing surgical instruments and tissue debris to pass through the working channel (14).

[0048] The cannula (20) of this type may include: a bell-shaped hub (not shown) located at the proximal end of the cannula; and an elongated cylindrical tube (22) extending distally from the hub and terminating at an angled cannula tip (24). The outer surface of the cannula (22) includes a plurality of tissue gripping features in the form of annular ribs (26) axially arranged along the middle portion of the cannula (22). The ribs (26) are configured to grip the abdominal wall tissue layers through which the cannula (20) is inserted, thereby aiding in stabilizing the cannula (20) in both the axial and radial directions when it is positioned within an opening formed in the patient's abdominal wall.

[0049] More specifically, the tissue gripping ribs (26) of the present example are formed in the sidewall of the cannula tube (22) as annular scallops such that each rib (26) tapers radially inward in the distal direction from a radially outermost edge of the rib (26). Thus, the radially outermost edges of the ribs 26 are generally flush with the un-ribbed proximal and distal portions of the cannula tube (22). The resulting configuration of the ribs (26) promotes advancement of the cannula tube (22) through a tissue layer in the distal direction and discourages retraction of the cannula tube (22) through the tissue layer in the opposite proximal direction. Advantageously, this configuration prevents inadvertent withdrawal of the cannula tube (22) from the patient's abdominal wall during a surgical procedure. It will be appreciated, however, that in other versions of the trocar (10), the cannula tube (22) can be provided with various other types of tissue gripping features. For example, the cannula tube (22) can include tissue gripping features in the form of one or more helical ribs that extend around at least an intermediate portion of the cannula tube (22) and can be scalloped similar to the ribs (26).

[0050] The sealed housing (30) of the cannula assembly (12) includes a proximal housing portion (32) and a distal housing portion (34) to which the proximal housing portion is removably attached. The proximal housing portion (32) includes a proximal head (36) and a distal base (38) that are secured together. The distal housing portion (34) includes a distal shroud (40) that encircles a proximal hub (not shown) of the cannula (20), a cover plate (42) that is secured to a proximal end of the distal shroud (40), and a latching ring (44) that is rotatably disposed between the distal shroud and the cover plate and has a radially outwardly projecting tab (46). The latching ring (44) is selectively rotatable about the central axis (A) of the trocar (10) between a locked position and an unlocked position via the tab (46). In the locked position, the latching ring (44) locks the proximal housing portion (32) to the distal housing portion (34). In the unlocked position, the latching ring (44) allows the proximal housing portion (32) to be separated from the distal housing portion (34), for example, to directly access a distal sealing structure (not shown) contained within the distal housing portion (34). In some versions, the distal shroud (40) can be integrally formed with the proximal end of the cannula tube (22) such that the distal shroud (40) is a component of the cannula (20).

[0051] Although not shown, the proximal housing portion (32) houses a proximal (or "outer") seal structure and the distal housing portion (34) houses a distal (or "inner") seal structure, both of which are disposed along the central axis (A) of the trocar (10). The proximal and distal seal structures cooperate to define a seal assembly that maintains insufflation to a patient's abdominal cavity during surgical procedures while allowing surgical instruments and tissue debris to pass along the working channel (14). For example, the proximal seal structure can include an annular seal member configured to sealingly engage a shaft of a laparoscopic surgical instrument directed through the working channel (14). The distal end seal structure can include a duckbill seal member configured to maintain the working channel (14) in a sealed state in the absence of a surgical instrument shaft.

[0052] The cannula assembly (12) also includes an insufflation port (50) operably coupled with the proximal end of the cannula (20) and having an adjustable valve in the form of a stopcock valve (52). The insufflation port (50) is configured to direct an insufflation fluid, such as carbon dioxide, from a fluid source (not shown) distally through the working channel (14) and into a patient's abdominal cavity, thereby expanding (or "insufflating") the cavity with the fluid. This expansion of the abdominal cavity creates additional space for easier performance of laparoscopic surgical procedures.

[0053] As Figure 1 and Figure 2As shown, the trocar (10) includes a cannula (12) having a proximal hub (20), an elongate cylindrical shaft (22) extending distally from the hub (20), and a tapered distal tip (24). The trocar (10) also includes a filler (16) having a proximal head (60), an elongate cylindrical shaft (62) extending distally from the head (60), and a tapered distal tip (64). The filler shaft (62) is configured to be received within the working channel (14) of the cannula assembly (12) such that the filler tip (64) extends through the cannula tip (24) and distally therefrom. The filler head (60) includes a domed upper body (66), a base plate (68), and an actuatable latching member (70) including a pair of latching arms (72) and a corresponding pair of latching buttons (74). The latching arms (72) are configured to be captured within respective slots (not shown) formed in a top surface of the sealed housing head (36) to couple the filler (16) with the cannula assembly (12). The latching buttons (74) are actuatable to release the latching arms (72) from the slots and thereby allow the filler (16) to be uncoupled from the cannula assembly (12). The filler (16) also includes a central channel (76) extending longitudinally through the filler head (60) and the filler shaft (62) and is configured to receive an endoscope (not shown) therein to provide visualization during insertion of the trocar (10) through a patient's abdominal wall. A clamp lever (78) of the filler head (60) is pivotable to selectively secure the endoscope within the central channel (76). The central channel (76) and the clamp lever (78) are merely optional features and can be omitted from the filler (16) in other versions.

[0054] The cannula assembly (12) and the filler (16) can be configured to be discarded after a single use on a patient. In other versions, one or more components of the trocar (10) can be suitably configured to withstand sterilization and multiple repeated uses, for example as described in greater detail below in connection with the trocar (110) of Figures 4-5 .

[0055] B. Exemplary deployment of a trocar into a patient's abdominal cavity

[0056] Figures 3A-3D An exemplary method of using the trocar (10) described above to access a patient's abdominal cavity (1) through the patient's abdominal wall (2) is shown. It will be appreciated that the abdominal wall (2) includes an outward, superficial layer and an inward, deep layer. The superficial layer generally includes an outer layer of skin (3) and an inner layer of fat (4); while the deeper layer includes alternating layers of muscle (5) and fascia (6) that are fibrous and flexible with a relatively higher tensile strength than the superficial layer.

[0057] As Figure 3AAs shown, with the packer (16) received within the cannulation assembly (12) and connected to the sealing housing (30), the clinician manipulates the cannula (10) via the packer head (60) and the sealing housing (30) to push the packer tip (64) against the skin (3) and medially toward the abdominal cavity (1) while rotating the cannula (10) back and forth. Continued medial pushing of the cannula (10) further guides the packer tip (64) and the cannula tip (24) distally through the layers of fat (4) and fascia (5) and into the cavity (1), as... Figure 3B As shown. As discussed above, this step is facilitated by visualization provided by an endoscope (not shown) mounted within the tampon (16). Once the cannula (20) has reached the desired depth in the insertion cavity (1), the clinician releases the tampon head (60) from the sealed housing (30) by pressing the latch button (74), and then withdraws the tampon (16) proximally from the cannula assembly (12), as... Figure 3C As shown. This allows the working channel (14) of the cannulation assembly (12) to freely receive surgical instruments passing distally through it for laparoscopic surgery. As described above, tissue engagement ribs (26) located on the cannulation channel (22) grip the tissue layers (3,4,5) of the abdominal wall (2), thereby providing the cannulation assembly (12) with at least a minimum degree of stability relative to the abdominal wall (2). After the laparoscopic surgery is completed, the clinician grasps the sealing housing (30) and withdraws the cannulation assembly (12) proximally from the abdominal wall (2), as... Figure 3D As shown.

[0058] C. Exemplary reusable trocars with disposable seal assemblies

[0059] In some cases, it may be desirable to construct the cannula so that one or more of its components can be sterilized and reused for multiple surgical procedures, while one or more other components can be easily and economically disposed of and replaced after each procedure. Figures 4-5 Another exemplary trocar (110) constructed in this manner is shown, which has a similar structure and function to the trocar (10) described above, unless otherwise described below.

[0060] Similar to the cannula (10), the cannula (110) includes a cannula assembly (112) having a working channel (114) and a tampon (116) configured to be coaxially inserted into the cannula assembly (112) along the working channel (114). The cannula assembly (112) includes a cannula (120) having: a bell-shaped hub (122) located at the proximal end of the cannula; and an elongated cylindrical tube (124) extending distally from the hub (122) and terminating at an angled cannula tip (126). The outer surface of the cannula (124) includes a plurality of tissue gripping features in the form of annular ribs (128) arranged axially along the middle portion of the cannula (124) and similar to the ribs (26) described above.

[0061] The cannulation assembly (112) also includes a sealing assembly (130). Unlike the sealing assembly defined by the sealing housing (30) of the cannula (10), the sealing assembly (130) is constructed as a modular, replaceable unit, designed to releasably engage with the proximal hub (122) of the cannula (120). Figure 5 As best shown, the sealing assembly (130) of this example typically includes an upper frame member (132), an intermediate frame member (134), and a lower frame member (136) arranged coaxially and fixed relative to each other. Although not shown, the proximal (or "outer") sealing structure is supported within the upper frame member (132), while the distal (or "inner") sealing structure is supported within the lower frame member (136). Such sealing structures may be structurally and functionally similar to the proximal and distal sealing structures of the cannula needle (10) described above. The sealing assembly (130) also includes a blow-in port (140) having an adjustable valve in the form of a stopcock valve (142).

[0062] A lower portion of the seal assembly (130) distal of the insufflation port (140) is configured to seat within the proximal hub (122) of the cannula (120) such that an annular seal member (144) disposed circumferentially about the lower portion sealingly engages an inner surface of the cannula hub (122). In this manner, an interior of the seal assembly (130) is in fluid communication with the opening of the cannula (120) to define a working channel (114) of the cannula assembly (112) through which insufflation fluid, surgical instruments, and tissue debris can be directed in the manner generally described above in connection with the trocar (10). The seal assembly (130) can be further configured in accordance with the teachings of one or more of U.S. Patent Publication No. 2019 / 0090905, entitled “Trocar Seal Assemblies,” published March 28, 2019, the disclosure of which is incorporated by reference herein; and / or U.S. Patent Publication No. 2019 / 0380742, entitled “Asymmetric Shaft Seal,” published December 19, 2019, the disclosure of which is incorporated by reference herein.

[0063] As Figure 5 As best shown in FIG. 1, the obturator (116) of the trocar (110) includes a proximal head (150), an elongate cylindrical shaft (152) extending distally from the head (150), and a tapered tip (154) at a distal end of the shaft (152). The obturator head (150) includes a domed upper body (156), a base plate (158), and an actuatable latch member (160) including a pair of downwardly extending latch arms (162) and a corresponding pair of latch buttons (164). The latch arms (162) are configured to be captured within respective slots (138) formed in a top surface of the upper frame member (132) of the seal assembly (130) to couple the obturator (116) with the cannula assembly (112). The latch buttons (164) are actuatable to release the latch arms (162) from the slots (138) and thereby permit the obturator (116) to be uncoupled from the cannula assembly (112).

[0064] The cannula (120) and obturator (116) of the present example are suitably constructed from a robust material, such as surgical steel, such that they can be sterilized and reused for multiple surgical procedures. In contrast, as noted above, the seal assembly (130) is configured as a disposable unit intended to be separated from the cannula (120) and replaced after each procedure. For example, the seal assembly (130) can be constructed from various polymeric materials including plastics and rubbers such that the seal assembly (130) can be readily manufactured and sold at a price that makes the seal assembly (130) suitable for disposal after a single use, similar to the trocar (10) described above.

[0065] II. Exemplary depth limiters

[0066] In some cases, the clinician can wish to limit the depth to which the single-use or reusable trocar (10, 110) can be advanced in the abdominal wall (2) (e.g., after the trocar (10, 110) is inserted to the desired location). Limiting the depth to which the trocar (10, 110) can be advanced in the abdominal wall (2) can help prevent the distal tip (64, 154) of the obturator (16, 116) and / or the cannula tip (24, 126) of the cannula assembly (12, 112) from unintentionally entering the abdominal cavity (1) deeper than desired. Preventing over-insertion of the trocar (10, 110) can reduce undesirable contact of the distal tip (64, 154) and / or the cannula tip (24, 126) with anatomical structures contained within the abdominal cavity (1).

[0067] Alternatively or in addition to limiting the depth to which the single-use or reusable trocar (10, 110) can be advanced in the abdominal wall (2), the clinician can wish to stabilize the trocar (10, 110) relative to the abdominal wall (2) (e.g., after the trocar (10, 110) is inserted to the desired location in the abdominal cavity (1)). The clinician can stabilize the trocar (10, 110) relative to the abdominal wall (2) by avoiding under-insertion of the trocar (10, 110). Stabilizing the trocar (10, 110) relative to the abdominal wall (2) after insertion in the abdominal wall (2) can help prevent the trocar (10, 110) from unintentionally pivoting about the insertion point in the abdominal wall (2) after the clinician releases the trocar (10, 110). Stabilizing the trocar (10, 110) keeps the cannula tip (24, 126) and, thus, the entry point of the surgical instrument into the abdominal cavity (1) in a desired position and / or orientation relative to the abdominal cavity (1).

[0068] As noted above with reference to Figures 1-5 The obturator (16, 116) is configured to be advanced along the central axis (in the direction of arrow A) to a position in which the distal tip (64, 154) of the obturator (16, 116) is disposed within the lumen (20, 120) of the cannula assembly (12, 112) and the cannula tip (24, 126) of the cannula assembly (12, 112) is disposed within the distal tip (64, 154) of the obturator (16, 116). In some cases, the clinician can wish to limit the depth to which the single-use or reusable trocar (10, 110) can be advanced in the abdominal wall (2) (e.g., after the trocar (10, 110) is inserted to the desired location). Limiting the depth to which the trocar (10, 110) can be advanced in the abdominal wall (2) can help prevent the distal tip (64, 154) of the obturator (16, 116) and / or the cannula tip (24, 126) of the cannula assembly (12, 112) from unintentionally entering the abdominal cavity (1) deeper than desired. Preventing over-insertion of the trocar (10, 110) can reduce undesirable contact of the distal tip (64, 154) and / or the cannula tip (24, 126) with anatomical structures contained within the abdominal cavity (1). Figures 1-2The cannula (shown as the central axis of the cannula (A)) is removably connected to the cannulas (20, 120) to facilitate insertion of the surgical access device through the patient's body cavity wall (shown as the abdominal wall (2)). The cannulas (20, 120) include working channels (14, 114) and tissue-grasping features (shown as ribs 26, 128). The working channels (14, 114) are configured to guide surgical instruments (not shown) along the central axis of the cannulas (20, 120). The tissue-grasping features are intended to include non-helical features (e.g., such as ridges and annular fans) and helical threads (e.g., overlapping or non-overlapping threads). The tissue-grasping features may extend only a portion of the length of the cannula (124). As previously described, the ribs (26, 128) are formed as annular fans. The ribs (26, 128) may be disposed along the outer surface of the cannulas (20, 120). Figures 3A-3D As shown, the ribs (26, 128) can be configured to stabilize the cannula (20, 120) relative to the patient's abdominal wall (2) when the cannula (20, 120) is inserted distally through the abdominal wall (2).

[0069] To reduce over-insertion and / or under-insertion of the cannula (10, 110), exemplary depth limiters (210, 310, 410, 1010, 1110, 1210, 1310, 1410) may be selectively coupled to the cannulation channels (22, 124, 216, 218, 316, 318) of the cannula (20, 120, 212, 214, 312, 314). The depth limiters (210, 310, 410, 1010, 1110, 1210, 1310, 1410) are described below. Figures 6-20 This is described in detail and can be used alone or in combination with another depth limiter (210, 310, 410, 1010, 1110, 1210, 1310, 1410), if needed. For example, depth limiters (210, 310, 410) can securely hold cannulas, including but not limited to cannulas with diameters of 5 mm, 8 mm, 10 mm, and 12 mm. Depth limiters (1010, 1110, 1210, 1310, 1410) are scalable to fit a variety of different cannula sizes, including but not limited to cannulas with diameters of 5 mm, 8 mm, 10 mm, and 12 mm.

[0070] Depth limiter (210) relative to Figures 4-5 The cannula (110) and the insertion cannula (120, 212, 214) with insertion channels (124, 216, 218) are shown. A depth limiter (310) is shown relative to the insertion channels (124, 216, 218) of the insertion cannula (120, 212, 214). Additionally, depth limiters (1010, 1110, 1210) are shown relative to...Figure 1 A trocar (10), a cannula (20), and a cannula tube (22) are shown. Depth limiters (1310, 1410) are shown relative to Figures 4-5 A trocar (110) is shown. However, it is contemplated that depth limiters (210, 310, 410, 1010, 1110, 1210, 1310, 1410) can be used with a variety of other suitable trocars, cannula assemblies, and obturators, including trocars (10, 110) and cannula tubes (22, 124, 216, 218, 316, 318) of cannulas (20, 120, 212, 214, 312, 314).

[0071] A. First exemplary depth limiter

[0072] Figures 6-9E A first exemplary depth limiter (210) is shown relative to a surgical access device (shown as trocar 110) that includes a cannula assembly (112) and an obturator (116) as described above. The depth limiter (210) is capable of an open configuration (see Figure 9A ) and a closed configuration (see Figures 9B-9E ). Specifically, Figure 6 A perspective view of the trocar (110) of Figure 4 is shown with the depth limiter (210) in the closed configuration that limits axial movement of the depth limiter (210) relative to the cannula tube (124) of the cannula assembly (112) along the longitudinal axis (Al).

[0073] Figure 7 A perspective view of the depth limiter (210) of Figure 6 is shown. As shown, the depth limiter (210) includes a housing (220). The housing (220) can be longer and / or wider to provide additional stability to the depth limiter (210). The housing (220) can include a main body portion (shown as arms (222, 224)) and a flexible hinge (shown as living hinge (226)). As shown, the living hinge (226) is disposed between the arms (222, 224). The arms (222, 224) can be pivotably coupled together at a pivot point (P) between the open and closed configurations using the living hinge (226). The living hinge (226) can provide a desired clamping force onto the outer diameter of the cannula tube (124, 216, 218). The depth limiter (210) can be coupled with the engagement feature (e.g., rib (128)) of the cannula tube (124, 216, 218). The depth limiter (210) can be reused during a surgical procedure.

[0074] The arm (222) may include a user contact portion (shown as an outer surface (228)) and gripping surfaces (230, 232, 234). The gripping surface (230) of the arm (222) may be spaced apart from the gripping surface (232) of the arm (222) by a connecting portion (236), and the gripping surface (232) of the arm (222) may be spaced apart from the gripping surface (234) of the arm (222) by a connecting portion (238). Similarly, the arm (224) may include a user contact portion (shown as an outer surface (240)) and gripping surfaces (242, 244, 246). The gripping surface (242) of the arm (224) may be spaced apart from the gripping surface (244) of the arm (224) by a connecting portion (248), and the gripping surface (244) of the arm (224) may be spaced apart from the gripping surface (246) of the arm (224) by a connecting portion (250). Similarly, the connecting portion (258) may be disposed between the gripping surface (234) of the arm (222) and the outer surface (228), and the connecting portion (260) may be disposed between the gripping surface (246) of the arm (224) and the outer surface (240). Although not shown, at least one of the outer surfaces (228, 240) may include a textured surface for enhancing user grip.

[0075] Figure 8 It shows along Figure 6 The line cut from 8-8 Figure 6 A cross-sectional view of the depth limiter (210) and the cannula (124). The gripping surfaces (230, 232, 234, 242, 244, 246) can be smooth, non-smooth, or a combination of smooth and non-smooth. As shown, the gripping surfaces of the arms (222, 224) are all smooth and can be configured to engage frictionally with the engagement features (e.g., ribs (128)) of the cannula (120) of the cannula (120) in a closed configuration and not engage frictionally with the ribs (128) of the cannula (120) in an open configuration.

[0076] The non-smooth surface on one or more of the gripping surfaces (230, 232, 234, 242, 244, 246) can include one or more features to lockingly engage the cannula conduit (124). Although not shown, at least one gripping surface (230, 232, 234, 242, 244, 246) of the arms (222, 224) can include an engagement feature (e.g., a ridge) to lockingly engage with tissue gripping features (e.g., ribs (128)) disposed along the outer surface of the cannula conduit (124, 216, 218) in the closed configuration and not lockingly engage with the ribs (128) of the cannula (120) in the open configuration. The depth limiter (210) can use the engagement features of the cannula conduit (124, 216, 218) to counteract the normal force applied when the depth limiter (210) contacts a body wall (e.g., the abdominal wall (2)). The engagement features (e.g., ridges) can be a tight fit with the ribs (128) of the cannula conduit (124, 216, 218) to facilitate force transfer. The gripping surfaces (230, 232, 234, 242, 244, 246) are shown as arcuate and continuous; however, the gripping surfaces (230, 232, 234, 242, 244, 246) can vary in shape.

[0077] Figures 9A-9E A depth limiter (210) is shown accepting and coupled with discrete cannula conduits having various diameters. For example, the arms (222, 224) can be pivotably coupled together using living hinges (226) between an open configuration configured to receive the cannula conduit (124, 216, 218) of the cannula (120, 212, 214) and a closed configuration configured to couple with the cannula conduit (124, 216, 218) of the cannula (120, 212, 214). Figure 9A A depth limiter (210) is shown in an open configuration, and Figures 9B-9E A depth limiter (210) is shown in a closed configuration.

[0078] Figure 9A A depth limiter (210) is shown accepting and coupled with discrete cannula conduits having various diameters. For example, the arms (222, 224) can be pivotably coupled together using living hinges (226) between an open configuration configured to receive the cannula conduit (124, 216, 218) of the cannula (120, 212, 214) and a closed configuration configured to couple with the cannula conduit (124, 216, 218) of the cannula (120, 212, 214). Figure 7The depth limiter (210) and the top plan view of the cannula (212) and cannula (216) shown in cross-section are illustrated. In the open configuration, the depth limiter (210) allows axial movement of the depth limiter (210) relative to the cannula (124, 216, 218) of the cannula (120, 212, 214). For example, a user can clamp two points to increase the effective diameter between opposing gripping surfaces (230, 242), between opposing gripping surfaces (232, 244), and between opposing gripping surfaces (234, 246). As shown, the outer surfaces (228, 240) are configured to be actuated by the user using their thumb and forefinger. However, the user can press the outer surfaces (228, 240) in other ways (e.g., using one or more fingers and the palm of the hand). Figure 9A The figure shows the insertion conduit (216) of the cannula (212) passing through the connecting portion (236) of the arm (222) and the connecting portion (248) of the arm (224). As shown, the insertion conduit (216) of the cannula (212) has passed through the connecting portions (238, 258) of the arm (222) and the connecting portions (250, 260) of the arm (224).

[0079] Figure 9B It shows Figure 9A A top plan view of the insertion conduit (216) of the depth limiter (210) and the cannula (212), but in which the depth limiter (210) is located... Figure 6 The closed configuration. Once the desired cannula channels (124, 216, 218) of the cannulas (120, 212, 214) are aligned, the user can release the outer surfaces (228, 240) to reduce the effective diameter between the opposing gripping surfaces (230, 242), between the opposing gripping surfaces (232, 244), and between the opposing gripping surfaces (234, 246). This transforms the depth limiter (210) into a closed configuration, wherein the depth limiter (210) is secured (e.g., clamped) to the cannula channel (216). The gripping surfaces (242) of the arm (224) together with the gripping surfaces (230) of the arm (222) form an opening (252) having a first effective diameter (ED1), which is configured to selectively engage with the cannula channel (216) of the cannula (212). In the closed configuration, the gripping surface (230) of the arm (222) is spaced apart from the gripping surface (242) of the arm (224) by a gap. When with Figure 9E In contrast, the arms (222, 224) can be biased inward to capture the cannulation tube (216).

[0080] Figure 9C It shows Figure 9AA top plan view of the depth limiter (210) and the cannula (214) cannula (218), wherein the depth limiter (210) is in a closed configuration. The gripping surface (244) of the arm (224) together with the gripping surface (232) of the arm (222) forms an opening (254) having a second effective diameter (ED2), which is configured to selectively engage with the cannula (218) cannula (214). The second effective diameter (ED2) is larger than the first effective diameter (ED1). When with Figure 9E In contrast, the arms (222, 224) can be biased inward to capture the cannulation tube (218).

[0081] Figure 9D It shows Figure 9A Depth limiter (210) and Figure 5 The top plan view of the cannula (124) shows the depth limiter (210) in a closed configuration. The gripping surface (246) of the arm (224) together with the gripping surface (234) of the arm (222) forms an opening (256) with a third effective diameter (ED3), which is configured to selectively engage with the cannula (124) of the cannula (120). The third effective diameter (ED3) is larger than either the first or second effective diameter (ED1, ED2). As shown, the openings (252, 254, 256) are separate and discrete from each other. When... Figure 9E Compared to the static configuration, the arms (222, 224) are offset inwards. For example... Figures 9B-9D As shown, in the fixed configuration, the depth limiter (210) is configured to limit the axial movement of the depth limiter (210) relative to the cannula (124, 216, 218) of the cannula (120, 212, 214). For example, the first effective diameter (ED1) may be approximately 5 mm, the second effective diameter (ED2) may be approximately 10 mm, and the third effective diameter (ED3) may be approximately 12 mm.

[0082] The depth limiter (210) can be reusable or disposable. In some models, the arms (222, 224) and the movable hinge are formed as a single piece. The depth limiter can be formed entirely of polymer material. The depth limiter (210) can be injection molded for disposable models. Alternatively, the depth limiter (210) can be stamped, machined, and / or metal injection molded for reusable models. In some models, the depth limiter (210) is formed entirely of metal. The depth limiter (210) may include a simple-to-operate pinch-and-release control.

[0083] B. Second exemplary depth limiter

[0084] Figures 10-11DA second exemplary depth limiter (310) associated with a surgical access device (e.g., trocar 10, 110) is shown. Specifically Figure 10 A perspective view of a depth limiter (310) that can move between an open configuration and a closed configuration is shown. As shown, the depth limiter (310) includes a housing (320). The housing (320) can be longer and / or wider to provide additional stability to the surgical access device. The housing (320) can include a body portion (shown as arms (322, 324)) and a biasing feature (shown as a torsion spring (326)). Another suitable spring is also contemplated, including but not limited to a leaf spring. As shown, the torsion spring (326) is disposed between the arms (322, 324). The torsion spring (326) can be fixedly attached to the arms (322, 324) using a friction fit and / or an adhesive. The arms (322, 324) can be pivotably coupled together at a pivot point (P) using the torsion spring (326) between the open configuration and the closed configuration. As shown, the arms (322, 324) are separate and distinct; however, the arms (322, 324) can be connected. The torsion spring (326) can provide a desired clamping force to the outer diameter of the cannula tubing (124, 316, 318). Although not shown, the depth limiter (310) can include a living hinge, similar to the living hinge (226). The depth limiter (310) can be coupled with cannula tubing having different diameters (e.g., cannula tubing (124, 316, 318)). The depth limiter (310) can repeatedly transition between the closed configuration and the open configuration during a surgical procedure. The size of the cannula tubing (316) can be similar to the size of the cannula tubing (216), and the size of the cannula tubing (318) can be similar to the size of the cannula tubing (218).

[0085] The arm (322) can include a user contact portion (shown as an outer surface (328)) and gripping surfaces (330, 332, 334). The gripping surface (330) of the arm (322) can be spaced apart from the gripping surface (332) of the arm (322) by a connecting portion (336), and the gripping surface (332) of the arm (322) can be spaced apart from the gripping surface (334) of the arm (322) by a connecting portion (338). Similarly, the arm (324) can include a user contact portion (shown as an outer surface (340)) and gripping surfaces (342, 344, 346). The gripping surface (342) of the arm (324) can be spaced apart from the gripping surface (344) of the arm (324) by a connecting portion (348), and the gripping surface (344) of the arm (324) can be spaced apart from the gripping surface (346) of the arm (324) by a connecting portion (350). Similarly, a connecting portion (358) can be disposed between the gripping surface (330) of the arm (322) and the outer surface (328), and a connecting portion (360) can be disposed between the gripping surface (342) and the outer surface (340) of the arm (324). Although not shown, at least one of the outer surfaces (328, 340) can include a textured surface for enhanced user grip.

[0086] The gripping surfaces (330, 332, 334, 342, 344, 346) can be smooth, non-smooth, or a combination of smooth and non-smooth. The non-smooth surfaces can include one or more features to lockingly engage with the cannula conduit (124, 316, 318). For example, at least one of the gripping surfaces of the arms (322, 324) can include an engagement feature (shown as a ridge (359)) to lockingly engage with tissue gripping features (e.g., ribs (128)) disposed along an outer surface of the cannula conduit (124, 316, 318) in the closed configuration and not lockingly engage with the ribs (128) of the cannula (120) in the open configuration. The depth limiter (310) can use the engagement features of the cannula conduit (124, 316, 318) to counteract normal forces applied when the depth limiter (310) contacts a body wall (e.g., abdominal wall (2)). The engagement features, such as the ridge (359), can be a tight fit with the ribs (128) of the cannula conduit (124, 316, 318) to facilitate force transfer. The gripping surfaces (330, 332, 334, 342, 344, 346) are shown as arcuate and continuous; however, the gripping surfaces (330, 332, 334, 342, 344, 346) can vary. Although not shown, the gripping surfaces of the arms (322, 324) can be smooth and configured to frictionally engage with engagement features (e.g., ribs (128)) of the cannula conduit (124, 316, 318) of the cannula (120, 312, 314) in the closed configuration and not frictionally engage with the ribs (128) of the cannula (120) in the open configuration.

[0087] Figures 11A-11D It is shown how the depth limiter (310) can accept and couple with cannula conduits having various diameters. The arms (322, 324) can be pivotably coupled together using a torsion spring (326) between an open configuration configured to receive the cannula conduit (124, 316, 318) of the cannula (120, 312, 314) and a closed configuration configured to couple with the cannula conduit (124, 316, 318) of the cannula (120, 312, 314). Figure 11A It is shown Figure 10top plan view of the depth limiter (310) and the cannula channel (316) of the cannula (312) shown in cross-section. In the open configuration, the depth limiter (310) can allow for axial movement of the depth limiter (310) relative to the cannula channel (124, 316, 318) of the cannula (120, 312, 314). For example, a user can pinch two points to increase the effective diameter between the opposing gripping surfaces (330, 342), between the opposing gripping surfaces (332, 344), and between the opposing gripping surfaces (334, 346). As shown, the outer surfaces (328, 340) are configured to be actuated by a user using the thumb and index finger. However, a user can press the outer surfaces (328, 340) in other ways (e.g., using one or more fingers and the palm).

[0088] Figure 11B shown in cross-section is shown in a closed configuration. Figure 11A Figure 6 Once the desired cannula channel (124, 316, 318) of the cannula (120, 312, 314) is aligned, a user can release the outer surfaces (328, 340) to decrease the effective diameter between the opposing gripping surfaces (330, 342), between the opposing gripping surfaces (332, 344), and between the opposing gripping surfaces (334, 346). This transitions the depth limiter (310) into the closed configuration, where the depth limiter (310) is secured (e.g., pinched) to the cannula channel (124, 316, 318). As shown, the gripping surface (342) of the arm (324) cooperates with the gripping surface (330) of the arm (322) to collectively form an opening (352) having a first effective diameter (ED1) that is configured to selectively couple with the cannula channel (316) of the cannula (312). Figure 11B Figure 10 The arms (322, 324) can be biased inward to capture and retain the cannula channel (316) when compared to the at-rest configuration.

[0089] Figure 11C shown in cross-section is shown in a closed configuration. Figure 11A ​​top plan view of the depth limiter (310) and a top plan view of a cannula channel (318) of a cannula (314), with the depth limiter (310) in a closed configuration. As shown, a gripping surface (344) of the arm (324) cooperates with a gripping surface (332) of the arm (322) to collectively form an opening (354) having a second effective diameter (ED2) configured to selectively couple with the cannula channel (318) of the cannula (314). The second effective diameter (ED2) is greater than the first effective diameter (ED1). When compared to Figure 9E The arms (322, 324) can be biased inward to capture the cannula channel (318) when compared to a rest configuration of the depth limiter (310). Figure 11C An open configuration is shown in dashed lines that allows the cannula channel (318) of the cannula (314) to be inserted into and from the opening (356).

[0090] Figure 11D An open configuration is shown in dashed lines that allows the cannula channel (318) of the cannula (314) to be inserted into and from the opening (356). Figure 11A a top plan view of the depth limiter (310) and Figure 5 a top plan view of the depth limiter (310) and a top plan view of a cannula channel (318) of a cannula (314), with the depth limiter (310) in a closed configuration. As shown, a gripping surface (344) of the arm (324) cooperates with a gripping surface (332) of the arm (322) to collectively form an opening (354) having a second effective diameter (ED2) configured to selectively couple with the cannula channel (318) of the cannula (314). The second effective diameter (ED2) is greater than the first effective diameter (ED1). When compared to Figure 10 The arms (322, 324) can be biased inward to capture the cannula channel (318) when compared to a rest configuration of the depth limiter (310). Figure 11D An open configuration is shown in dashed lines that allows the cannula channel (318) of the cannula (314) to be inserted into and from the opening (356).

[0091] As shown in Figures 11B-11D the fixed configuration, the depth limiter (310) is configured to limit axial movement of the depth limiter (310) relative to a cannula channel (124, 316, 318) of a cannula (120, 312, 314). For example, the first effective diameter (ED1) can be about 5 millimeters, the second effective diameter (ED2) can be about 10 millimeters, and the third effective diameter (ED3) can be about 12 millimeters.

[0092] The depth limiter (310) can be reusable or disposable. The depth limiter can be formed entirely of polymeric material. The depth limiter (310) can be injection molded for a disposable model. Alternatively, the depth limiter (310) can be stamped, machined, and / or metal injection molded for a reusable model. In some versions, the depth limiter (310) is formed entirely of metal. The depth limiter (310) can include a pinch-to-release control that is simple to operate.

[0093] C. Third exemplary depth limiter

[0094] Figure 12 A third exemplary depth limiter (410) is shown in relation to a surgical access device. Like the depth limiters (210, 310), the depth limiter (410) is movable between an open configuration and a closed configuration. As shown, the depth limiter (410) includes a housing (420). The housing (420) can be integrally formed as a single piece. In some versions, the housing (420) can be a thin metal band formed into a desired shape. The thickness (T) of the housing (420) affects the force required to transition the depth limiter (410) between the open and closed configurations. The housing (420) can be longer and / or wider to provide additional stability. The thin metal band allows the housing (420) to be efficiently and effectively sterilized. The housing (420) can include a main body portion (shown as arms (422, 424)) and a living hinge (426). The living hinge (426) can provide a desired clamping force onto the outer diameter of the cannula tubing (124, 216, 218, 316, 318). The living hinge (426) can also have a thickness (T). The depth limiter (210) can accommodate multiple cannula tubes (124, 216, 218) and can be reused during a surgical procedure.

[0095] Similar to arms (222, 322), arm (422) can include a user contact portion (shown as an outer surface (428)) and gripping surfaces (430, 432, 434). Gripping surface (430) of arm (422) can be spaced apart from gripping surface (432) of arm (422) by a connecting portion (436), and gripping surface (432) of arm (422) can be spaced apart from gripping surface (434) of arm (422) by a connecting portion (438). Similar to arms (224, 324), arm (424) can include a user contact portion (shown as an outer surface (440)) and gripping surfaces (442, 444, 446). Gripping surface (442) of arm (424) can be spaced apart from gripping surface (444) of arm (424) by a connecting portion (448), and gripping surface (444) of arm (424) can be spaced apart from gripping surface (446) of arm (424) by a connecting portion (450). Similarly, a connecting portion (458) can be disposed between gripping surface (430) and outer surface (428) of arm (422), and a connecting portion (460) can be disposed between gripping surface (442) and outer surface (440) of arm (424).

[0096] Gripping surfaces (430, 432, 434, 442, 444, 446) can be smooth, non-smooth, or a combination of smooth and non-smooth. As shown, gripping surfaces of arms (422, 424) are smooth and can be configured to frictionally engage with engagement features (e.g., ribs (128)) of cannula lumens (124, 216, 218, 316, 318) of cannulas (120, 412, 414) in the closed configuration and not frictionally engage with ribs (128) of cannula (120) in the open configuration. Non-smooth surfaces can include one or more features to lockingly engage with the cannula lumens (124). Although not shown, at least one of the gripping surfaces of arms (422, 424) can include engagement features (e.g., ridges similar to ridges (359)) to lockingly engage with tissue gripping features (e.g., ribs (128)) disposed along an outer surface of the cannula lumens (124, 216, 218, 316, 318) in the closed configuration and not lockingly engage with ribs (128) of cannula (120) in the open configuration. Gripping surfaces (430, 432, 434, 442, 444, 446) are shown as arcuate and continuous; however, gripping surfaces (430, 432, 434, 442, 444, 446) can vary.

[0097] Similar to reference Figures 9A-9E and depth limiter (210) and reference Figures 11A-11Ddepth limiter (310), a user can pinch two points to increase the effective diameter between opposing gripping surfaces (430, 442), between opposing gripping surfaces (432, 444), and between opposing gripping surfaces (434, 446). As shown, outer surfaces (428, 440) are configured to be actuated by a user using a thumb and index finger. However, a user can press outer surfaces (428, 440) in other ways (e.g., using one or more fingers and a palm). Once a desired cannula conduit (124, 216, 218, 316, 318) of cannula (120, 412, 414) is aligned, a user can release outer surfaces (428, 440) to decrease the effective diameter between opposing gripping surfaces (430, 442), between opposing gripping surfaces (432, 444), and between opposing gripping surfaces (434, 446). This transitions depth limiter (410) to a closed configuration, where depth limiter (410) is secured (e.g., pinched) to cannula conduit (124, 216, 218, 316, 318).

[0098] Gripping surface (442) of arm (424) cooperates with gripping surface (430) of arm (422) to collectively form an opening (452) having a first effective diameter (ED1) configured to selectively couple with a cannula conduit (416) of cannula (412). Similarly, gripping surface (444) of arm (424) cooperates with gripping surface (432) of arm (422) to collectively form an opening (454) having a second effective diameter (ED2) configured to selectively couple with a cannula conduit (418) of cannula (414). Second effective diameter (ED2) is greater than first effective diameter (ED1). Gripping surface (446) of arm (424) cooperates with gripping surface (434) of arm (422) to collectively form an opening (456) having a third effective diameter (ED3) configured to selectively couple with a cannula conduit (124) of cannula (120). Third effective diameter (ED3) can be greater than either of first and second effective diameters (ED1, ED2). Openings (452, 452, 456) are separate and discrete from one another. In the secured configuration, depth limiter (410) is configured to limit axial movement of depth limiter (410) relative to cannula conduits (124, 216, 218, 316, 318) of cannula (120, 412, 414). For example, first effective diameter (ED1) can be about 5 millimeters, where second effective diameter (ED2) can be about 10 millimeters, and where third effective diameter (ED3) can be about 12 millimeters.

[0099] The depth limiter (410) can be reusable or disposable. The depth limiter can be formed entirely of polymer material. The depth limiter (410) can be injection molded for disposable models. Alternatively, the depth limiter (410) can be stamped, machined, and / or metal injection molded for reusable models. In some types, the depth limiter (410) is formed entirely of metal. The depth limiter (410) can be made from a single piece, wherein the spring-like properties of the metal allow the depth limiter (410) to move between a fixed configuration and an open configuration without including a separate biasing feature (e.g., a leaf spring or torsion spring). The depth limiter (410) may include a simple-to-operate pinch-and-release control.

[0100] D. Fourth exemplary depth limiter

[0101] Figure 13 A perspective view of a fourth exemplary depth limiter (1010) is shown. The depth limiter (1010) includes a hub (1012) and a plurality of legs (1014). The depth limiter (1010) can be used in conjunction with the depth limiters (210, 310, 410) described above. Although the hub (1012) is shown as generally square, other shapes of hubs (1012) are also conceivable. As shown, the hub (1012) includes a bore (1016) that extends fully through it. The bore (1016) may include a gripping surface (1018). The gripping surface (1018) may extend parallel to a longitudinal axis defined by the cannula conduit (22) of the cannula (20). Although Figures 13-14B refer to Figure 1 The cannula (10) with insertion channel (22) described has a depth limiter (1010), but other cannula channels (e.g., cannula (124)) may also be used. The gripping surface (1018) may be smooth or non-smooth. Figure 13 As shown, the gripping surface (1018) includes a smooth surface that can frictionally engage with a portion of the cannula (20), such as a rib (26) . Alternatively, the gripping surface (1018) may include a non-smooth surface that may include one or more features to lockably engage with the cannula conduit (22). In other words, the depth limiter (1010) may be secured to the cannula (20) using a mating thread (such as a nut) or a suitable amount of interference fit. Such threads of the depth limiter (1010) may be helical or non-helical (e.g., fan-shaped). For example, the gripping surface (1018) may include at least one tooth configured to lockably engage with at least one rib (26) of the cannula (20).

[0102] The legs (1014) can have a generally constant cross-sectional area of radial movement away from the hub (1012); however, the legs (1014) can have a non-uniform cross-section. For example, one or more ends of the legs (1014) can include cupped portions (1020) to distribute downward force. As shown, the legs (1014) are separated by approximately 90 degrees. More or fewer legs (1014) are also contemplated.

[0103] The depth limiter (1010) can provide additional stability to the trocar (10) against tilting. The depth limiter (1010) can be configured to limit sudden tilting using the legs (1014), thereby stabilizing the cannula (20). The depth limiter (1010) is configured to prevent accidental over-insertion into the body while also limiting the displacement and / or velocity of off-axis tilting of the trocar (10) to stabilize the trocar (10). This stabilization can be achieved using a mechanical spring effect of each leg (1014). The legs (1014) can have a reduced mass, allowing the legs (1014) to flex outward, causing a variable amount of spring resistance in each direction along the trocar (10) that attempts to tilt. For example, the legs (1014) can have a reduced mass portion (e.g., a living hinge portion), and / or can rely on the inherent spring force of the legs (1014). The legs (1014) can contact the body wall of the patient to prevent or at least slow the tilting of the cannula (20).

[0104] Figures 14A-14B A depth limiter (1010) is shown; however, Figures 14A-14B The teachings of the depth limiter (1010) can also be applicable to the depth limiters (1110, 1210) described in detail below. Figure 14A A depth limiter (1010) is shown; however, Figure 1 A depth limiter (1010) is shown; however, Figure 13 A partial side cross-sectional view of the depth limiter (1010) of the trocar (10) of Figure 14AIn a non-deployed configuration (e.g., a resting configuration) of the depth limiter (1010), the legs (1014) can be bent downward. As the depth limiter (1010) is pushed against the abdominal wall (2), the legs (1014) bend flatter and provide a counter force against the abdominal wall (2) and the cannula (20). The degree to which the legs (1014) bend flatter can be controlled by the user. For example, additional force (e.g., a user's downward hand pressure) can cause the legs (1014) to bend flatter until the depth limiter (1010) is disposed adjacent to the abdominal wall (2). As the flatness of the legs (1014) increases, the amount of counter force on the cannula (20) can also increase, which increases the locking force. For example, when the user has pressed the depth limiter (1010) to a partially (but not fully) deployed configuration, the legs (1014) can have a degree of deployment. Additionally, if the user subsequently applies an off-axis load, one or more of the legs (1014) can be pressed further than the other legs (1014), but upon removal of the off-axis load, the legs (1014) can balance and return to a centered, original position in a controlled manner.

[0105] Figure 14B is shown coupled to the cannula tube (22) of the cannula assembly (12) of the Figure 1 is shown coupled to the cannula tube (22) of the cannula assembly (12) of the Figure 13 partial side cutaway view of the depth limiter (1010) of the trocar (10) of the present disclosure, where the legs (1014) of the depth limiter (1010) are in a deployed configuration with the distal end of the cannula tube (22) received within the abdominal cavity (1). In the deployed configuration, the legs (1014) can reduce the amount of rotational displacement / tilt that the trocar (10) can achieve, and can also reduce the speed at which the trocar (10) can achieve this tilt (i.e., prevent sudden, unexpected motion within the body). To fully disengage the depth limiter (1010) from the cannula tube (22), the user can retract the cannula (20) outside of the abdominal wall (2) to sufficiently reduce the compression / clamping force of the depth limiter (1010) against the abdominal wall (2) so that the user can pull the depth limiter (1010) back with their hand. The depth limiter (1010) can be disposable or reusable.

[0106] E. Fifth exemplary depth limiter

[0107] Figure 15A fifth example depth limiter (1110) similar to the depth limiter (1010) is shown. The depth limiter (1110) includes a hub (1112) similar to the hub (1012), legs (1114) similar to the legs (1014), a bore (1116) similar to the bore (1016), a gripping surface (1118) of the bore (1116) similar to the gripping surface (1018). The legs (1114) can include cup portions (1120) similar to the cup portions (1020). Unlike the depth limiter (1010) shown as including four legs (1014), the depth limiter (1110) includes two legs (1114). For example, the legs (1114) can be separated by approximately 180 degrees. The legs (1114) are similar to the legs (1014) described above with reference to the depth limiter (1010) and the depth limiter (1110) is similar to the depth limiter (1010) described above with reference to the depth limiter (1010). Figures 14A-14B The legs (1014) shown are flexed as described above with reference to the depth limiter (1010).

[0108] F. Sixth exemplary depth limiter

[0109] Figure 16 A sixth example depth limiter (1210) similar to the depth limiters (1010, 1110) is shown. The depth limiter (1210) includes a hub (1212) similar to the hub (1012), legs (1214) similar to the legs (1014), a bore (1216) similar to the bore (1016), a gripping surface (1218) of the bore (1216) similar to the gripping surface (1018). The legs (1114) can include cup portions (1220) similar to the cup portions (1020). Unlike the depth limiter (1010) shown as including four legs (1014), the depth limiter (1210) includes three legs (1214). For example, the legs (1214) can be evenly separated by approximately 120 degrees around the hub (1212). However, the legs (1214) can be unevenly separated. In some cases, the use of three or four legs (1014, 1214, 1314, 1414) can allow for further stability and ergonomics to allow for finger gripping by the user (U). The legs (1214) can be similar to the legs (1014) described above with reference to the depth limiter (1010) and the depth limiter (1210) is similar to the depth limiter (1010) described above with reference to the depth limiter (1010). Figures 14A-14B The legs (1014) shown are flexed as described above with reference to the depth limiter (1010).

[0110] G. Seventh exemplary depth limiter

[0111] Figures 17-19B A seventh example depth limiter (1310) is shown. In particular, Figure 17A perspective view of the depth limiter (1310) is shown. As shown, the depth limiter (1310) includes a hub (1312) and a plurality of legs (1314) extending from the hub (1312). The depth limiter (1310) can be used in conjunction with any or more of the depth limiters (210, 310, 410) described above. Although the hub (1312) is shown as generally cylindrical, other shapes of hubs (1312) are also conceivable. As shown, the hub (1312) includes a bore 1316 and a plurality of recesses 1318. The recesses (1318) allow the depth limiter (1310) to be converted from a movable configuration to a fixed configuration.

[0112] The aperture (1316) includes a gripping surface (1320) configured to engage with the outer surface of the cannula (124) in a fixed configuration. The gripping surface (1320) may extend parallel to the longitudinal axis defined by the cannula (124) of the cannula (120). The gripping surface (1320) may be smooth or non-smooth. Figure 17 As shown, the gripping surface (1320) may include a smooth surface that frictionally engages with the ribs (128) of the cannula (120) in a fixed configuration. Alternatively, the gripping surface (1320) may include a non-smooth surface that may include one or more features for locking engagement with the cannula conduit (124). The hub (1312) of the depth limiter (1310) may be secured to the cannula (120) using a mating thread (such as a nut) or an interference fit. The thread may be helical or non-helical (e.g., fan-shaped). For example, the gripping surface (1320) may include at least one tooth configured to lockably engage with at least one rib (128) of the cannula (120). For example, a notch (1318) may be formed in the hub (1312) of the depth limiter (1310) such that when sufficient force is applied to each leg (1314), the leg (1314) may selectively collapse, causing the gripping surface (1320) to clamp more tightly onto the cannula (120). Thus, the depth limiter (1310) can limit the insertion depth of the cannula channel (124) of the cannula (120) and provide stability control of the cannula channel (124) of the cannula (120).

[0113] The legs (1314) may have a generally tapered cross-section that allows radial movement away from the hub (1312). For example, one or more ends of the legs (1314) may include distal end pads (1322) to distribute downward forces. As shown, the legs (1314) are spaced approximately 90 degrees apart. The legs (1314) may be spaced unevenly. Alternatively, more or fewer legs (1314) may be conceived. A depth limiter (1310) may provide additional stability to the cannula (110) against tilting. The depth limiter (1310) may be configured to use the legs (1314) to limit sudden tilting, thereby stabilizing the cannula (120). The legs (1314) may contact the body wall to prevent or at least slow tilting of the cannula (120). Although Figures 18A-19B The insertion cannula (124) of the reference cannula (110) describes a depth limiter (1310), but insertion cannulas (22,416,616) of the cannula (20,412,612) may also be used.

[0114] Figure 18A and Figure 19A A depth limiter (1310) in a movable configuration is shown. Specifically, Figure 18A It shows the relationship with Figure 5 The cannulation assembly (112) is connected to the cannulation conduit (124). Figure 17 Top plan view of the depth limiter (1310), wherein the hub (1312) of the depth limiter (1310) is in a movable configuration. Figure 19A It shows the relationship with Figure 5 The cannulation assembly (112) is connected to the cannulation conduit (124). Figure 17 A partial side cross-sectional view of the depth limiter (1310), wherein the legs (1314) of the depth limiter (1310) are in a movable configuration. A gripping surface (1320) forms a second effective diameter (ED2) that allows axial movement of the depth limiter (1310) relative to the outer diameter of the cannula (124) of the cannula (120). In the movable configuration, which is also considered a stationary configuration, the legs (1314) bend downwards. Once pushed against the abdominal wall (2), the legs (1314) bend more flat and provide reaction forces against the abdominal wall (2) and the cannula (120).

[0115] Figure 18B and Figure 19B A depth limiter (1310) in a fixed configuration is shown. Specifically, Figure 18B The diagram shows the interaction after the tampon (116) is separated and removed. Figure 5 The cannulation assembly (112) is connected to the cannulation conduit (124). Figure 17partial side cross-sectional view of a depth limiter (1310) in which the legs (1314) of the depth limiter (1310) are in a fixed configuration. In the fixed configuration, the notches (1318) can be forced closed to narrow the aperture (1316). The legs (1314) can reduce the amount of rotational displacement / tilt that the trocar (110) can exhibit, and can also reduce the speed at which the trocar (110) can assume a tilt (i.e., prevent sudden movement in the body). In the fixed configuration, the gripping surfaces (1320) collectively form a first effective diameter (ED1) that limits axial movement of the depth limiter (1310) relative to the cannula (120) by directly contacting the cannula (120). The depth limiter (1310) can be disposable or reusable. Figure 19B shows the cannula assembly (112) coupled with the cannula tubing (124) of the trocar (110) after the obturator (116) has been separated and removed. Figure 5 Figure 17 shows a partial side cross-sectional view of a depth limiter (1310) in which the legs (1314) of the depth limiter (1310) are in a fixed configuration. In the fixed configuration, the notches (1318) can be forced closed to narrow the aperture (1316). The legs (1314) can reduce the amount of rotational displacement / tilt that the trocar (110) can exhibit, and can also reduce the speed at which the trocar (110) can assume a tilt (i.e., prevent sudden movement in the body). In the fixed configuration, the gripping surfaces (1320) collectively form a first effective diameter (ED1) that limits axial movement of the depth limiter (1310) relative to the cannula (120) by directly contacting the cannula (120). The depth limiter (1310) can be disposable or reusable.

[0116] H. Eighth exemplary depth limiter

[0117] Figure 20 shows a top cross-sectional view of an eighth example depth limiter (1410). The depth limiter (1410) includes a hub (1412) and a plurality of legs (1414) extending from the hub (1412). The depth limiter (1410) can be used in conjunction with any one or more of the depth limiters (210, 310, 410, 1010, 1110, 1210, 1310) described above. In some versions, the hub (1412) can be generally cylindrical. As shown, the hub (1412) includes an aperture (1416) configured to receive the cannula tubing (124) of the cannula (120). As shown, the legs (1414) can be separated by approximately 90 degrees. However, the legs (1414) can be unevenly separated. Additionally, more or fewer legs (1414) are also contemplated, similar to the depth limiters (1110, 1210) shown in FIGS. 11 and 12. Figures 15-16

[0118] ​​The depth limiter (1410) includes a fluid chamber (1418) that can be disposed within the hub (1412) and the leg portions (1414). For example, the fluid chamber (1418) can be completely enclosed by the hub (1412) and the leg portions (1414). The fluid chamber can include a plurality of fluid passages (1420) that include a constriction (1422). The constriction (1422) can be generally disposed between the hub (1412) and the leg portions (1414). The constriction (1422) regulates flow between the hub (1412) and the leg portions (1414). In other words, the fluid chamber (1418) can be integrated into the leg portions (1414) with the constrictions (1422) forming restricted flow areas at the base of each leg portion (1414). As shown, one or more ends of the leg portions (1414) can include an extension portion (1424) that is configured to extend from a compressed configuration (C) to an expanded configuration (E). The depth limiter (1410) can provide additional stability to the trocar (110) against tilting. As additional tilting forces act on each individual leg portion (1414), fluid can be redistributed to other leg portions (1414), but the fluid can be limited by these restricted areas (1422) to create a dampening effect on the tilting of the trocar (110). This dampening effect can regulate the speed of the tilting of the trocar (110). Thus, the depth limiter (1410) can limit sudden tilting of the trocar (110) via restricted fluid flow between the leg portions (1414) to stabilize the cannula (120).

[0119] The aperture (1416) includes a gripping surface (1426) that can couple with an outer surface of the cannula tubing (124) of the cannula (120). The gripping surface (1426) can extend parallel to a longitudinal axis defined by the cannula tubing (124) of the cannula (120). The gripping surface (1426) can be smooth or non-smooth. As shown, the gripping surface (1426) can include a smooth surface that frictionally engages with the ribs (128) of the cannula (120). Alternatively, the gripping surface (1426) can include a non-smooth surface that can include one or more features to lockingly engage with the cannula tubing (124). For example, the hub (1412) of the depth limiter (1410) can be secured to the cannula (120) or to a fan-shaped cannula using mating threads (e.g., a nut). The threads can be helical or non-helical (e.g., fan-shaped). For example, the gripping surface (1426) can include at least one tooth that is configured to lockingly engage with at least one of the ribs (128) of the cannula (120). The depth limiter (1410) can be disposable. Figure 20

[0120] I. Exemplary methods ​

[0121] A method of inserting a surgical access device (e.g., trocar 10, 110) through a body wall (e.g., abdominal wall (2)) of a patient is also described. The trocar (10, 110) can include a cannula (20, 120, 212, 214, 312, 314), a obturator (16, 116), and one or more depth limiters (210, 310, 410, 1010, 1110, 1210, 1310, 1410).

[0122] The method includes coupling the depth limiter (210, 310, 410, 1010, 1110, 1210, 1310, 1410) with a cannula channel (22, 124, 216, 218, 316, 318) of the cannula (20, 120, 212, 214, 312, 314) when in the open configuration. This coupling can be obtained by a user actuating an outer surface (228, 240, 328, 340, 428, 440) of the depth limiter (210, 310, 410), which causes the gripping surface (230, 232, 234, 242, 244, 246, 330, 332, 334, 342, 344, 346, 430, 432, 434, 442, 444, 446, 1320) to move from the fixed configuration to the open configuration. The openings (252, 254, 256, 352, 354, 356, 452, 454, 456) can be separate and discrete from one another. For example, the openings (252, 352, 452) can receive a cannula channel (216, 316) having a first effective diameter (ED1), the openings (254, 354, 454) can receive a cannula channel (218, 318) having a second effective diameter (ED2), and / or the openings (256, 356, 456) can receive a cannula channel (22, 124) having a third effective diameter (ED3). For example, the first effective diameter (ED1) can be about 5 millimeters, wherein the second effective diameter (ED2) can be about 10 millimeters, and wherein the third effective diameter (ED3) can be about 12 millimeters. However, other diameters of the cannula channel are also contemplated.

[0123] The method can include inserting at least a portion of a cannula tube (22, 124, 216, 218, 316, 318) of the cannula (20, 120, 212, 214, 312, 314) into the patient. Once the cannula (20, 120, 212, 214, 312, 314) is re-actuated by a user within the body of the subject, the depth limiter (210, 310, 410, 1310) can be moved along the cannula (20, 120, 212, 214, 312, 314), which causes the gripping surfaces (230, 232, 234, 242, 244, 246, 330, 332, 334, 342, 344, 346, 430, 432, 434, 442, 444, 446) to move from the closed configuration to the open configuration.

[0124] The method can include inserting at least a portion of a cannula tube (22, 124, 216, 218, 316, 318) of the cannula (20, 120, 212, 214, 312, 314) into the patient. Once the cannula (20, 120, 212, 214, 312, 314) is re-actuated by a user within the body of the subject, the depth limiter (210, 310, 410, 1310) can be moved along the cannula (20, 120, 212, 214, 312, 314), which causes the gripping surfaces (230, 232, 234, 242, 244, 246, 330, 332, 334, 342, 344, 346, 430, 432, 434, 442, 444, 446) to move from the closed configuration to the open configuration.

[0125] III. Exemplary combinations

[0126] The following embodiments relate to various non-exhaustive ways in which the teachings herein can be combined or applied. It should be understood that the following embodiments are not intended to limit the coverage of any claims that can be presented at any time by any party related to this patent application or its successors. No disclaimer is intended. The following embodiments are provided only as examples of how the various teachings herein can be combined and applied. It is contemplated that various teachings herein can be combined and applied in a number of ways. It is also contemplated that some embodiments can omit certain features referred to in the following embodiments. Accordingly, no inference should be drawn that any claim is directed to only equipment that includes all features identified in the following embodiments, or that any claim is directed to only equipment that does not include one of more features identified in the following embodiments. It is further contemplated that claims can be presented that are broader than any of the following embodiments. Such broader claims shall not be limited by the preferred embodiments or any of the following embodiments.

[0127] Example 1

[0128] A depth limiter configured to couple with a first trocar cannula and a second trocar cannula, wherein the first trocar cannula and the second trocar cannula have different diameters, the depth limiter comprising: (a) a first body portion comprising: (i) a first gripping surface, and (ii) a second gripping surface; (b) a second body portion, wherein the first body portion and the second body portion are pivotably coupled together and movable between an open configuration and a closed configuration, wherein in the open configuration the first body portion and the second body portion are configured to allow axial movement of the depth limiter relative to the first trocar cannula and the second trocar cannula, wherein in the closed configuration the first body portion and the second body portion are configured to limit axial movement of the depth limiter relative to the first trocar cannula and the second trocar cannula, wherein the second body portion comprises: (i) a first gripping surface configured together with the first gripping surface of the first body portion to limit axial movement of the depth limiter relative to the first trocar cannula in the closed configuration, and (ii) a second gripping surface configured together with the second gripping surface of the first body portion to limit axial movement of the depth limiter relative to the second trocar cannula in the closed configuration.

[0129] Example 2

[0130] The depth limiter according to embodiment 1, wherein the first gripping surface of the first body portion and the second body portion collectively form a first opening having a first effective diameter configured to selectively couple with the first trocar cannula in the closed configuration, wherein the second gripping surface of the first body portion and the second body portion collectively form a second opening having a second effective diameter configured to selectively couple with the second trocar cannula in the closed configuration, wherein the second effective diameter is greater than the first effective diameter.

[0131] Example 3

[0132] The depth limiter according to embodiment 2, wherein the first opening and the second opening are separate and discrete from one another.

[0133] Example 4

[0134] The depth limiter according to any one or more of embodiments 1-3, wherein the first body portion includes a third gripping surface, wherein the second body portion includes a third gripping surface, the third gripping surface of the second body portion collectively with the third gripping surface of the first body portion collectively forming a third opening having a third effective diameter configured to selectively couple with a third trocar cannula, wherein the third effective diameter is greater than either of the first effective diameter and the second effective diameter.

[0135] Example 5

[0136] The depth limiter according to embodiment 4, wherein in the open configuration, the depth limiter is configured to allow axial movement of the depth limiter relative to the first trocar cannula, the second trocar cannula, and the third trocar cannula, wherein in the closed configuration, the depth limiter is configured to limit axial movement of the depth limiter relative to the first trocar cannula, the second trocar cannula, and the third trocar cannula.

[0137] Example 6

[0138] The depth limiter according to any one or more of embodiments 4-5, wherein the first effective diameter is about 5 millimeters, wherein the second effective diameter is about 10 millimeters, and wherein the third effective diameter is about 12 millimeters.

[0139] Example 7

[0140] The depth limiter according to any of the preceding embodiments, further comprising a living hinge disposed between the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the living hinge.

[0141] Example 8

[0142] The depth limiter according to embodiment 7, wherein the first body portion, the second body portion, and the living hinge are integrally formed together as a unitary piece.

[0143] Example 9

[0144] The depth limiter according to any of the preceding embodiments, further comprising a spring coupled with the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the spring.

[0145] Example 10

[0146] The depth limiter according to any of the preceding embodiments, wherein the first gripping surface of the first body portion is spaced apart from the second gripping surface of the first body portion by a first connecting portion, wherein the first gripping surface of the second body portion is spaced apart from the second gripping surface of the second body portion by a second connecting portion.

[0147] Example 11

[0148] The depth limiter according to any of the preceding embodiments, wherein in the closed configuration, the first gripping surface of the first body portion is spaced apart from the first gripping surface of the second body portion by a gap.

[0149] Example 12

[0150] The depth limiter according to any of the preceding embodiments, wherein at least one of the first gripping surface or the second gripping surface of the first body portion and the second body portion comprises an engagement feature to lockingly engage with a tissue gripping feature disposed along an outer surface of the first trocar cannula or the second trocar cannula.

[0151] Example 13

[0152] The engagement feature of the first or second trocar cannula of the depth limiter according to any of the preceding embodiments comprises a ring-shaped rib, wherein the tissue grasping feature comprises a parallel ridge configured to lockingly engage with the ring-shaped rib of the first or second trocar cannula.

[0153] Example 14

[0154] The depth limiter according to any of the preceding embodiments, wherein at least one of the first or second grasping surfaces of the first or second body portions comprises a smooth surface configured to frictionally engage with the first or second trocar cannula.

[0155] Example 15

[0156] The depth limiter according to any of the preceding embodiments, wherein the first body portion comprises a first user contact portion, wherein the second body portion comprises a second user contact portion, wherein the first and second body portions are configured to be actuated by a user to move the depth limiter from the closed configuration to the open configuration.

[0157] Example 16

[0158] A depth limiter configured to couple with a first and second trocar cannula, wherein the first and second trocar cannula have different diameters, the depth limiter comprising: (a) a first body portion; (b) a second body portion, wherein the first and second body portions are pivotably coupled together and movable between an open configuration and a closed configuration, wherein in the open configuration the first and second body portions are configured to allow axial movement of the depth limiter relative to the first or second trocar cannula, wherein in the closed configuration the first and second body portions are configured to limit axial movement of the depth limiter relative to the first or second trocar cannula, and (c) a plurality of openings defining the first and second body portions, wherein each opening of the plurality of openings has a different effective diameter in the closed configuration, wherein the depth limiter is configured to retain a cannula within a selected opening of the plurality of openings to limit axial movement of the depth limiter relative to the first and second trocar cannula in the closed configuration.

[0159] Example 17

[0160] The depth limiter according to embodiment 16, further comprising a living hinge disposed between the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the living hinge.

[0161] Example 18

[0162] The depth limiter according to embodiment 16, wherein the first body portion, the second body portion, and the living hinge are integrally formed together as a unitary piece.

[0163] Example 19

[0164] The depth limiter according to any one or more of embodiments 16-18, further comprising a torsion spring coupled with the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the torsion spring.

[0165] Example 20

[0166] A method of inserting a surgical access device through a body wall of a patient, wherein the surgical access device comprises a cannula, the method comprising: (a) inserting the cannula into either a first opening or a second opening of a depth limiter when the depth limiter is in an open configuration, wherein the first opening and the second opening are separate and discrete from one another; (b) transitioning the depth limiter from the open configuration to a closed configuration to axially limit the depth limiter relative to the cannula; and (c) inserting at least a portion of the surgical access device into the patient while using the depth limiter to prevent over-insertion of the surgical access device into the body wall of the patient.

[0167] IV. Miscellaneous

[0168] It should be appreciated that any one or more of the teachings, expressions, embodiments, examples, etc. described herein can be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. described herein. The above-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable methods, features, components, and / or functions described herein can be employed in conjunction with each other, without necessarily being out of context. Such modifications and variations are intended to be included within the scope of the claims. It is intended that the claims cover all such modifications and variations as fall within the scope of the claims.

[0169] Furthermore, any one or more of the teachings of this document can be combined with any one or more of the teachings of the following patent applications: U.S. Patent Application entitled "Pinch-To-Release Cannula Depth Limiter" [Attorney Docket No. END9247USNP1] filed on even date herewith; U.S. Patent Application entitled "Pinch-To-Clamp Cannula Depth Limiter" [Attorney Docket No. END9247USNP3] filed on even date herewith; U.S. Patent Application entitled "Universal Size Multi-Walled Elastomer Cannula Depth Limiter" [Attorney Docket No. END9247USNP4] filed on even date herewith; U.S. Patent Application entitled "Threaded Cannula Depth Limiter" [Attorney Docket No. END9247USNP5] filed on even date herewith; U.S. Patent Application entitled "Tilting Tang Cannula Depth Limiter" [Attorney Docket No. END9247USNP6] filed on even date herewith; U.S. Patent Application entitled "Two Piece Separable Obturator" [Attorney Docket No. END9247USNP7] filed on even date herewith; U.S. Patent Application entitled "Latchless Obturator with Interference Fit Feature" [Attorney Docket No. END9247USNP8] filed on even date herewith; U.S. Patent Application entitled "Balancing Feature for Reusable Trocar" [Attorney Docket No. END9247USNP9] filed on even date herewith; U.S. Patent Application entitled "Airflow Channels and Patterns in Lumen for Cannula" [Attorney Docket No. END9247USNP10] filed on even date herewith; and / or U.S. Patent Application entitled "Stabilizer for Surgical Shafts or Cannulas" [Attorney Docket No. END9247USNP11] filed on even date herewith. The disclosure of each of these patent applications is hereby incorporated by reference herein.

[0170] It should be understood that any patents, patent publications, or other publications referred to herein are incorporated by reference in their entirety only to the extent that the incorporated material is not inconsistent with existing definitions, statements, or other disclosure material set forth in the present disclosure. Thus, and to the extent necessary, the disclosure herein expressly incorporates by reference the entire text of all patent, patent publication, and other disclosure materials cited herein. Any material, or portion thereof, that is said to be incorporated by reference herein, but which contradicts the present disclosure, including definitions, is only incorporated to the extent that the material is not contradictory.

[0171] Versions of the devices described above can have application in conventional medical treatments and procedures conducted by a medical professional, as well as application in robotic-assisted medical treatments and procedures. By way of example only, various teachings herein can be readily incorporated into a robotic surgical system such as the DAVINCI® system by Intuitive Surgical, Inc., of Sunnyvale, California. TMSystem. Similarly, those of ordinary skill in the art will recognize that the various teachings herein can be readily incorporated into any of the various teachings of the following patents: U.S. Patent 5,792,135, entitled "Articulated Surgical Instrument For Performing Minimally Invasive Surgery With Enhanced Dexterity and Sensitivity," issued August 11, 1998, the disclosure of which is incorporated by reference herein; U.S. Patent 8,783,541, entitled "Robotically-Controlled Surgical End Effector System," issued July 22, 2014, the disclosure of which is incorporated by reference herein; U.S. Patent 8,479,969, entitled "Drive Interface for Operably Coupling a Manipulatable Surgical Tool to a Robot," issued July 9, 2013; U.S. Patent 8,800,838, entitled "Robotically-Controlled Cable-Based Surgical End Effectors," issued August 12, 2014, the disclosures of which are incorporated by reference herein; and / or U.S. Patent 8,573,465, entitled "Robotically-Controlled Surgical End Effector System with Rotary Actuated Closure Systems," issued November 5, 2013, the disclosure of which is incorporated by reference herein.

[0172] Devices of the foregoing variety can be designed to be disposed of after a single use, or they can be designed to be used multiple times. Devices may, in either case or in both cases, be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps of disassembly of the device, followed by cleaning and / or replacement of particular pieces, and subsequent reassembly. In particular, some versions of the device can be disassembled, and certain identified pieces can be selectively replaced or removed in any combination. Upon cleaning and / or replacement of particular pieces, some versions of the device can be reassembled for subsequent use either at a reconditioning facility, or by a user immediately prior to a procedure. Those skilled in the art will appreciate that reconditioning of a device can utilize a variety of techniques for disassembly, cleaning / replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.

[0173] By way of example only, the versions described herein can be sterilized prior to and / or following a procedure. In one sterilization technique, the device is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and device can then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation can kill bacteria on the device and in the container. The sterilized device can then be stored in the sterile container for later use. A device can also be sterilized using any other technique known in the art, including but not limited to beta or gamma radiation, ethylene oxide, or steam.

[0174] Having shown and described various embodiments of the present application, further adaptations and modifications can be made by those of ordinary skill in the art without departing from the scope of the application. Several of such possible modifications have already been mentioned, and others will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. For example, the embodiments, implementations, geometries, materials, dimensions, ratios, steps, and the like discussed above are illustrative and not necessary. Accordingly, the specification and figures are to be regarded in an illustrative manner and should be understood that the application is not limited to the details shown and described herein.

Claims

1. A depth limiter configured to couple with a first trocar cannula and a second trocar cannula, wherein the first trocar cannula and the second trocar cannula have different diameters, the depth limiter comprising: (a) a first body portion comprising: (i) a first gripping surface, and (ii) a second gripping surface; and (b) a second body portion, wherein the first body portion and the second body portion are pivotably coupled together and movable between an open configuration and a closed configuration, wherein in the open configuration the first body portion and the second body portion are configured to permit axial movement of the depth limiter relative to the first trocar cannula and the second trocar cannula, wherein in the closed configuration the first body portion and the second body portion are configured to limit axial movement of the depth limiter relative to the first trocar cannula and the second trocar cannula, wherein the second body portion comprises: (i) a first gripping surface configured, together with the first gripping surface of the first body portion, to limit axial movement of the depth limiter relative to the first trocar cannula in the closed configuration, and (ii) a second gripping surface configured, together with the second gripping surface of the first body portion, to limit axial movement of the depth limiter relative to the second trocar cannula in the closed configuration, wherein at least one of the first gripping surfaces or the second gripping surfaces of the first body portion and the second body portion comprises an engagement feature to lockingly engage with a tissue gripping feature disposed along an outer surface of the first trocar cannula or the second trocar cannula.

2. The depth limiter of claim 1, wherein, The first gripping surfaces of the first body portion and second body portion collectively form a first opening having a first effective diameter configured to selectively couple with the first trocar cannula in the closed configuration, wherein the second gripping surfaces of the first body portion and the second body portion collectively form a second opening having a second effective diameter configured to selectively couple with the second trocar cannula in the closed configuration, wherein the second effective diameter is greater than the first effective diameter.

3. The depth limiter of claim 2, wherein, The first opening and the second opening are separate and discrete from one another.

4. The depth limiter of claim 2, wherein, The first body portion comprises a third gripping surface, wherein the second body portion comprises a third gripping surface, the third gripping surfaces of the second body portion and the first body portion collectively form a third opening having a third effective diameter configured to selectively couple with a third trocar cannula, wherein the third effective diameter is greater than either of the first effective diameter and the second effective diameter.

5. The depth limiter of claim 4, wherein, in the open configuration, the depth limiter is configured to permit axial movement of the depth limiter relative to the first trocar cannula, the second trocar cannula, and the third trocar cannula, wherein in the closed configuration, the depth limiter is configured to limit axial movement of the depth limiter relative to the first trocar cannula, the second trocar cannula, and the third trocar cannula.

6. The depth limiter of claim 4, wherein, the first effective diameter is about 5 millimeters, wherein the second effective diameter is about 10 millimeters, and wherein the third effective diameter is about 12 millimeters.

7. The depth limiter of claim 1, further comprising a living hinge disposed between the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the living hinge.

8. The depth limiter of claim 7, wherein, the first body portion, the second body portion, and the living hinge are integrally formed together as a unitary piece.

9. The depth limiter of claim 1, further comprising a spring coupled with the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together between the open configuration and the closed configuration using the spring.

10. The depth limiter of claim 1, wherein, the first gripping surface of the first body portion is spaced apart from the second gripping surface of the first body portion by a first connecting portion, wherein the first gripping surface of the second body portion is spaced apart from the second gripping surface of the second body portion by a second connecting portion.

11. The depth limiter of claim 1, wherein, in the closed configuration, the first gripping surface of the first body portion is spaced apart from the first gripping surface of the second body portion by a gap.

12. The depth limiter of claim 1, the engagement feature of the first trocar cannula or the second trocar cannula comprises an annular rib, wherein the tissue grasping feature comprises a parallel ridge configured to lockingly engage with the annular rib of the first trocar cannula or the second trocar cannula.

13. The depth limiter of claim 1, wherein, the first body portion comprises a first user contact portion, wherein the second body portion comprises a second user contact portion, wherein the first body portion and the second body portion are configured to be actuated by a user to move the depth limiter from the closed configuration to the open configuration.

14. A depth limiter configured to couple with a first trocar cannula and a second trocar cannula, wherein the first trocar cannula and the second trocar cannula have different diameters, the depth limiter comprising: (a) a first body portion comprising a gripping surface; (b) a second body portion comprising a gripping surface corresponding to the gripping surface of the first body portion, wherein the first body portion and the second body portion are pivotably coupled together and are movable between an open configuration and a closed configuration, wherein in the open configuration the first body portion and the second body portion are configured to allow axial movement of the depth limiter relative to the first or second trocar cannula, wherein in the closed configuration the first body portion and the second body portion are configured to limit axial movement of the depth limiter relative to the first or second trocar cannula, and (c) a plurality of openings defined by the gripping surfaces of the first body portion and the second body portion, wherein each opening of the plurality of openings has a different effective diameter in the closed configuration, wherein the depth limiter is configured to hold a cannula within a selected opening of the plurality of openings to limit axial movement of the depth limiter relative to the first and second trocar cannulas in the closed configuration, wherein at least one of the gripping surfaces of the first body portion and the second body portion comprises an engagement feature to lockingly engage with a tissue gripping feature disposed along an outer surface of the first or second trocar cannula.

15. The depth limiter of claim 14, further comprising a living hinge disposed between the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together using the living hinge between the open configuration and the closed configuration.

16. The depth limiter of claim 15, wherein, the first body portion, the second body portion, and the living hinge are integrally formed together as a unitary piece.

17. The depth limiter of claim 14, further comprising a torsion spring coupled with the first body portion and the second body portion, wherein the first body portion and the second body portion are pivotably coupled together using the torsion spring between the open configuration and the closed configuration.

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