US 8,684,251 B2Grant
Stapler for mucosectomy
Issue Date:2014-04-01
•19 Claims
•4 Drawing Sheets
Abstract
A head for a stapler used during a mucosectomy is disclosed that includes an external body, an internal body, an anvil, and a blade. The internal body includes a central hole into which a rod is slidingly inserted. One or more annular grooves are formed on a lateral surface of the rod, and are intended to receive a portion of mucosa which is included in a purse string suture as the mucosa is tied around the rod. By retracting the rod in the central hole of the internal body, the mucosa to be removed is carried into the internal body.
Metadata
Assignee
- Covidien AG
Inventors
- Carlo Rebuffat
- Dante David
Application Information
Application Number:US 13/594,071
Filing Date:2012-08-24
Priority Date:2012-08-24
Art Unit:3721
Classifications
IPC:
A61B17/04A61B17/10
Patent Drawings (4 sheets)
Description
[0001] This application is a continuation of U.S. patent application Ser. No. 12/529,909, filed Feb. 22, 2010, which is a National Stage Entry under 35 U.S.C. §371(a) of International Patent Application No. PCT/IT2007/000166, filed on Mar. 7, 2007, the entire content of each of the applications identified above being incorporated by reference herein.
[0002] The present invention relates to a stapler for mucosectomy in hollow organs and, more particularly, a type of stapler which is provided with a central grooved rod allowing to carry out a precise mucosectomy of a larger volume of mucosal tissue.
[0003] Mucosectomy is an operation which is particularly suited for the treatment of haemorrhoids, rectocele and rectal mucosal prolapse. Circular mechanical staplers are already known, both for applying staples and for applying compression devices such as e.g. fragmentable rings. Said staplers are provided with a central shaft. The objective of mucosectomy is to remove a portion of mucosa which is as large as possible, so as to ensure a remarkable “lifting” of the mucosa of the hollow organ.
[0004] In order to achieve this objective, in U.S. Pat. No. 6,102,271 a circular stapler is disclosed whose head comprises two concentric goblet-shaped bodies. Two through openings are provided on the lateral surface of said goblet-shaped bodies, in the proximity of the stems thereof. The through openings allow the purse-string suture thread to pass outwards therethrough. The suture thread can thus be pulled towards the outside of the above mentioned goblet-shaped bodies so as to drag into the inside thereof a volume of mucosa which is as large as possible. The mucosa is then cut by a circular blade which is fixed to the edge of the internal goblet-shaped body. At the same time, a shaft which is centrally arranged relative to the goblet-shaped bodies moves an anvil which is fixed to the end of the shaft in the proximity of the edge of the external goblet-shaped body for applying suture staples. However, the stapler described in the above mentioned patent has the drawback that the manual pulling of the suture threads during the step of closing the stapler does not allow to remove the mucosa in a homogeneous and controlled way with exactness.
[0005] Object of the present invention is thus to provide a stapler for mucosectomy which is free from such drawbacks. Said object is achieved by a stapler whose main characteristics are specified in the first claim, while other characteristics are specified in the subsequent claims.
[0006] In order to achieve said object, the stapler according to the present invention is provided with a central rod having one or more annular grooves formed on its lateral surface crosswise to its axis. Such grooves are intended to receive a portion of tissue when a purse-string suture is tied around the rod, as well as to prevent said portion of tissue from undesirably sliding along the central rod as the latter is retracted inside the stem of the internal goblet-shaped body. In order to ensure that during said retraction of the rod the hollow body wall is dragged in a controlled and homogeneous way into the internal goblet-shaped body, said grooves are suitably dimensioned and exactly spaced one from the other.
[0007] Another advantage provided by the stapler according to the present invention is to allow a precise removal of different amounts of mucosa simply by selecting a certain annular groove among those formed and calibrated on the rod of the stapler.
[0008] Further advantages and characteristics of the stapler according to the present invention will be evident to those skilled in the art from the following detailed and non-limiting disclosure of two embodiments thereof with reference to the annexed drawings wherein:
[0009] FIG. 1 is a partially sectioned side view of the head of a first embodiment of the stapler according to the present invention in an open position;
[0010] FIG. 2 is a longitudinally sectioned view of the head of the stapler in FIG. 1 being introduced inside a partially sectioned hollow organ through a hollow cylindrical introducer;
[0011] FIG. 3 is a longitudinally sectioned view of the head of the stapler in a closed position inside a hollow organ through a hollow cylindrical introducer;
[0012] FIG. 4 is a partially sectioned side view of the head of a second embodiment of the stapler according to the present invention in an open position;
[0013] FIG. 5 is an axonometric view of the head of the stapler of FIG. 4 in a closed position being introduced inside a partially sectioned hollow organ through a hollow cylindrical introducer; and
[0014] FIG. 6 is a longitudinally sectioned view of the head of the stapler of FIG. 5 .
[0015] FIGS. 1 and 2 show a head of a stapler comprising in a known way an external goblet-shaped body 1, being provided with a first hollow stem 1a, wherein a smaller internal goblet-shaped body 2 is concentrically and slidingly provided. A circular blade 3 is fixed to the edge of said internal goblet-shaped body 2. In a retracted position of the internal goblet-shaped body 2, the circular blade 3 is located inside the external goblet-shaped body 1 without protruding from the edge 4 of the latter. At the opposite side with respect to the circular blade 3 the internal goblet-shaped body 2 has a second hollow stem 2a which is provided with a central hole 5 wherein a rod 6 is slidingly inserted. In correspondence to the part which is opposite to the one where the central hole 5, wherein the anvil rod 6 slides, is located, the anvil rod 6 has an end 7 to which an anvil 8 is fixed. The hollow stem 1a of the external goblet-shaped body 1 of the head of the stapler shown in the drawings is connected in a known way to a handle (not shown). Said anvil 8 and said circular blade 3 are intended to be progressively moved closer one to the other in order to cut the mucosa as the stapler head reach a closed position, that is when the anvil rod 6 is progressively retracted into the central hole 5 of the second hollow stem 2a by means of suitable rod retraction means (not shown in the drawings) which are included in the stapler handle, as it is known to a person skilled in the art. The circular blade 3 is moved forward by suitable blade moving means (not shown in the drawings) which are also included in the stapler handle, as it is known to a person skilled in the art. The edge 4 of the internal goblet-shaped body 2 can be provided with suitable recesses 4a which are designed to contain suitable suture means, such as for example metallic staples. In FIG. 2 the stapler head is shown in the open position and introduced in a hollow organ 9 through a hollow cylindrical introducer 10 being provided with flanges 10a and 10b.
[0016] The rod 6 has, according to the invention, one ore more annular grooves 11 which are spaced one from the other and formed on the lateral surface of the rod 6 perpendicularly to the axis thereof. Said annular grooves 11 are intended to receive in their inside a portion of mucosa 9a of the hollow organ 9 which is included in a purse string suture (not shown) when the mucosa 9a is tied around the rod 6. The number of annular grooves 11 and the distance between them are suitably calibrated in order to provide a plurality of fixing positions for the purse-string suture on the rod so as to be always able remove an amount of mucosa Which is as large as possible.
[0017] The depth of the annular grooves 11 of the rod 6 is comprised between 0.5 mm and 3 mm, preferably it is about 1 mm. The cross-section of the rod 6 is preferably circular, but it can also be polygonal.
[0018] Each annular groove 11 of the rod 6 consists of a cylindrical surface 12, which has a smaller diameter than the rest of the lateral surface of the rod 6 and is connected thereto by a fillet surface 13. The radius of the fillet surface 13 between the cylindrical surface 12 and the rest of the lateral surface of the rod 6 is preferably about 1 mm.
[0019] In order to carry out the mucosectomy with the stapler according to the present invention, first a purse string suture is made in a prolapsing portion of mucosa 9a to be removed from a hollow organ 9. The stapler head is then introduced in the hollow organ 9 in the open position, that is with the anvil 8 being spaced from the edge 4 of the external goblet-shaped body 1, by making the anvil 8 pass through the purse string suture. Subsequently the purse string suture is tied around the rod 6 between the edge 4 of the external goblet-shaped body 1 and the anvil 8. In particular the purse string suture is tied around the rod 6 in correspondence to an annular groove 11 which is formed on the rod 6 in such a way that the portion of mucosa 9a being included by the purse string suture is laid therein without any possibility to slide along the rod 6. In order to remove in a controlled, homogeneous and exact way large amounts of mucosa, a determined annular groove 11 is selected among the annular grooves 11 formed on the rod 6 at a well calibrated reciprocal distance.
[0020] As it is shown in FIG. 3 , the stapler head is finally closed by retracting the rod 6 in the central hole 5 of the stem 2a of the internal goblet-shaped body 2, thus carrying the mucosa to be removed into the internal goblet-shaped body 2 and contemporaneously causing the anvil 8 to push the mucosa to be removed against the edge 4 of the external goblet-shaped body 1.
[0021] After closing the stapler head by suitable rod retraction means, suture means 14 are applied to the mucosa of the hollow body 9 in correspondence to the edge 4 of the external goblet-shaped body 1. For example, such suture means 14 can be metallic staples. Subsequently, the internal goblet-shaped body 2 and the circular blade 3 being integral thereto are moved towards the anvil 8, by suitable moving means, thus separating the mucosa contained in the internal goblet-shaped body 2 from the mucosa of the hollow organ 9 to which the suture means 14 have been applied. Finally, the stapler head is extracted from the hollow organ 9.
[0022] FIGS. 4 , 5 and 6 show a second alternative embodiment wherein the stapler head is suitable to apply a fragmentable compression device. In this embodiment the anvil 8′ is a support for a component 14′ of the compression device to be coupled to complementary components 14″, 14′″, which are arranged in correspondence to the edge 4 of the external goblet-shaped body 1, when the stapler head is closed, as it is known to a person skilled in the art.
[0023] Preferably, during the mucosectomy the hollow body 9 is held open by means of a hollow cylindrical introducer 10, as it is shown in the FIGS. 2 , 3, 5 and 6.
[0024] In order to illustrate the usefulness of the presence on the rod 6 of several annular grooves 11 and to highlight the biunivocal correspondence which is thus created between the distance of each individual groove 11 from the anvil 8, 8′ and the volume of mucosa to be removed, reference is made to the following non-limiting example of a stapler according to the present invention.
[0025] In a stapler provided with a circular blade 3 having a diameter of 24 mm and with a rod 6 having a diameter equal to 5 mmi 1 mm-deep annular grooves 11 are formed on the rod 6 thus, in correspondence to the grooves 11, the rod 6 has a diameter of 3 mm.
[0026] If an annular groove 11 was located in correspondence to the connecting point of the rod 6 to the anvil 8, 8′, when a purse string suture is tied around the rod 6 in correspondence to said groove 11, 21 mm of mucosa might be removed, that is two times the distance between the circular blade 3 and the annular groove 11, said distance being equal to the radius of 12 mm of the circular blade 3 minus the 1.5 mm radius of the rod 6 in correspondence to the groove 11.
[0027] In order to remove larger amounts of mucosa, it is preferable that the stapler is provided with three annular grooves 11 arranged at 10 mm, 20 mm and 30 mm respectively from the anvil 8, 8′. Such grooves correspond to about 29 mm, 45 mm and 63.5 mm of mucosa which can be removed. In fact, grooves 11 which are spaced from the anvil 8, 8′, when the rod 6 is retracted in the stem 2a of the goblet-shaped body 2, allow to drag into said goblet-shaped body 2 a larger amount of mucosa, as the distance between the circular blade 3 and the annular groove 11 wherein the mucosa 9a is fixed by means of the purse string suture increases, as it is shown in FIGS. 3 and 6 . It is evident that the surgeon using the stapler according to the present invention can operate more rapidly, exactly and safely due to the present invention.
Claims
The invention claimed is:
1. A surgical fastener applying apparatus, comprising:
a head assembly including a body;
an anvil rod configured and dimensioned for slidable insertion into the body of the head assembly; and
an anvil attached to a distal end of the anvil rod, wherein the anvil rod includes three annular grooves formed in an outer surface thereof arranged in perpendicular relation to a longitudinal axis of the anvil rod, the grooves being spaced from one another along the longitudinal axis of the anvil rod such that a portion of the outer surface of the anvil rod is positioned between adjacent grooves, the grooves being arranged at varying distances from the anvil, and being configured and dimensioned to selectively receive a portion of mucosa to be tied around the anvil rod in a purse string suture such that varying amounts of mucosa can be drawn into the body of the head assembly during approximation of the head assembly and the anvil dependent upon the groove to which the mucosa is secured.
2. The surgical fastener applying apparatus according to claim 1, wherein one of the grooves is spaced 10 mm from the anvil, one of the grooves is spaced 20 mm from the anvil, and one of the grooves is spaced 30 mm from the anvil.
3. The surgical fastener applying apparatus according to claim 1, wherein each groove defines a depth between 0.5 mm and 3 mm.
4. The surgical fastener applying apparatus according to claim 3, wherein each groove defines a depth equal to 1 mm.
5. The surgical fastener applying apparatus according to claim 1, wherein the anvil rod has a circular cross-sectional configuration.
6. The surgical fastener applying apparatus according to claim 1, wherein each groove defines a cylindrical surface having a smaller diameter than remaining portions of the outer surface of the anvil rod, each groove being connected to the outer surface of the anvil rod by a fillet surface.
7. The surgical fastener applying apparatus according claim 6, wherein the fillet surface defines a radius of 1 mm.
8. The surgical fastener applying apparatus according to claim 1, wherein the body of the head assembly includes an external body and an internal body, the internal body being smaller than the external body, and positioned concentrically within the external body, the internal body being configured and dimensioned to slidingly receive the anvil rod.
9. The surgical fastener applying apparatus according to claim 8, further including a blade connected to an edge of the internal body.
10. A surgical fastener applying apparatus, comprising:
a head assembly including a body;
an anvil rod configured and dimensioned for slidable insertion into the body of the head assembly; and
an anvil attached to a distal end of the anvil rod, the anvil rod including three grooves integrally formed in an outer surface thereof arranged at varying distances from the anvil, each of the grooves being configured and dimensioned to selectively receive a portion of mucosa to be tied around the anvil rod in a purse string suture such that varying amounts of mucosa can be drawn into the head assembly during approximation of the head assembly and the anvil dependent upon the groove to which the mucosa is secured.
11. The surgical fastener applying apparatus according to claim 10, wherein each groove extends in perpendicular relation to a longitudinal axis of the anvil rod.
12. The surgical fastener applying apparatus according to claim 10, wherein each groove is annular in configuration.
13. The surgical fastener applying apparatus according to claim 10, wherein the grooves are spaced apart from one another along a longitudinal axis of the anvil rod such that a portion of the outer surface of the anvil rod is positioned between each adjacent groove.
14. The surgical fastener applying apparatus according to claim 10, wherein one of the grooves is spaced 10 mm from the anvil, one of the grooves is spaced 20 mm from the anvil, and one of the grooves is spaced 30 mm from the anvil.
15. The surgical fastener applying apparatus according to claim 10, wherein each groove defines a depth between 0.5 mm and 3 mm.
16. The surgical fastener applying apparatus according to claim 15, wherein each groove defines a depth equal to 1 mm.
17. The surgical fastener applying apparatus according to claim 10, wherein each groove defines a cylindrical surface having a smaller diameter than remaining portions of the outer surface of the anvil rod, each groove being connected to the outer surface of the anvil rod by a fillet surface.
18. The surgical fastener applying apparatus according claim 17, wherein the fillet surface defines a radius of 1 mm.
19. A method of performing a surgical procedure, comprising:
securing a flexible member to a section of target tissue;
inserting an anvil of a surgical fastener applying apparatus into an opening in a patient;
selecting one of three grooves formed in an outer surface of an anvil rod extending proximally from the anvil, to which the flexible member will be secured;
securing the flexible member directly to the selected groove in the outer surface of the anvil rod; and
approximating the anvil and a head assembly of the surgical fastener applying apparatus to draw the target tissue into a body of the head assembly with the anvil rod.
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