Tissue removal bag for removing tissue from surgical site

Abstract

A tissue extraction bag for extracting tissue from a surgical site, comprising: an elongate extraction wire having a proximal end and a distal end; a container having a closed end and an expandable open end wherein at least a portion of the opening is arranged to be positioned adjacent to the distal end of the extraction wire and at least one continuous portion of the open end is embossed thereby forming an elastic structure in the shape of a circular ring having a cross-sectional area; the container includes a membrane check valve configured in the form of a star-shaped structure, and a perimeter of the membrane check valve that expands when receiving tissue is equal to or greater than a perimeter of an open end of the container, and the membrane check valve is configured to be partially adjacent to the circular ring, the membrane check valve has an open end such that when the membrane check valve is pushed to receive tissue through the open end, a tapered shape can be formed, and the tapered shape has a height in the range of 15% to 60%, and preferably in the range of 20% to 30% of the height of the container.

Description

TECHNICAL FIELD

[0001] The engineering relates to a tissue extraction bag for extracting tissue from a surgical site. BACKGROUND

[0002] Endoscopic surgical extraction bags are known in the art. Generally, such bags are made of flexible and durable material. Such bags are to be deployed within a visceral cavity and closed with a separate thread or drawstring after the bag is filled with the excised matter. These prior arts include the disclosure based on US application No. US20040158261A1, wherein a drawstring is provided near the edge of the opening 16 and is adapted to be tightened over the tissue pedicle to seal and lock the bag. Certain prior arts also include additional devices to facilitate bag opening and tissue capture during laparoscopic surgery. These prior arts include the disclosure based on US patent No. US5279539A, wherein the device is a surgical bag with two drawstrings. The first drawstring is made of elastic thread-like string for keeping the mouth of the bag open during use and is detachable from the bag. The second drawstring is intended to tie the mouth of the bag after the organ or tissue is enclosed and the first drawstring is detached. However, having separate additional components leads to more complexity in terms of manufacturing process, components required for manufacturing and the cost associated with these components. There can also be issues with the learning process associated with the control of the relevant components of the endoscopic surgical extraction bag during the actual operation process.

[0003] Therefore, there is a need to develop an endoscopic bag that is easy to use while minimizing the number of components for ease of manufacturing and use. However, such development also faces various challenges. These challenges include issues related to the appropriate material, the dimensional structure of such material and the appropriate mechanism that should be integrated with such material in order to secure the extracted tissue within the extraction bag. The appropriateness mentioned also requires specific optimization of the relevant parameters related to the above-mentioned issues. SUMMARY

[0004] One of the objectives of the present invention is to provide a tissue extraction bag for extracting tissue with the minimum number of required components and still having a mechanism to prevent the return of the tissue through the opening.

[0005] A tissue extraction bag for extracting tissue from a surgical site according to the present invention, comprising: an elongated extraction string having a proximal end and a distal end; a container having a closed end and an inflatable open end, wherein at least a portion of the opening is disposed adjacent to the distal end of the extraction string, and at least one continuous portion of the open end is embossed, thereby forming a resilient structure in the shape of a circular ring having a cross-sectional area; wherein the container comprises a membrane check valve, the membrane check valve is configured in the form of a star-shaped structure, and the perimeter of the membrane check valve when inflated upon receiving tissue is equal to or greater than the perimeter of the open end of the container, and the membrane check valve is configured to be partially adjacent to the circular ring, such that the membrane check valve when pushed upon receiving tissue is capable of forming a conical shape, and the conical shape has a height in the range of 15% to 60% of the height of the container, and preferably the conical shape has a height in the range of 20% to 30% of the height of the container.

[0006] In one aspect, the conical shape comprises a circular base disposed adjacent to the circular ring and a tip of a cone positioned inside the container, the conical shape is configured such that the radius of the circular base is substantially the same as the radius of the open end of the container, and the conical height is in the range of 10% to 50% of the total height of the membrane check valve, and preferably the conical height is in the range of 15% to 25% of the total height of the membrane check valve.

[0007] In another aspect, the star-shaped structure is a multi-point star-shaped structure, and the dimensions of the multi-point star-shaped structure are calculated based on the relationship between the number of points of the star-shaped structure and the length of the points of the star-shaped structure according to the following formula:

[0008] n(2L) = the perimeter of the exit end of the membrane check valve,

[0009] Pi(D) = the perimeter of the entry end of the membrane check valve,

[0010] wherein Pi = 3.1416,

[0011] D = the diameter of the open end of the bag,

[0012] N = the number of points of the star-shaped structure,

[0013] L = the length of the points of the star-shaped structure, wherein 2L = D.

[0014] In one possible implementation, the number of points of the star-shaped structure is 3.

[0015] In another aspect, the thin film check valve made of thermoplastic substrate has a thickness in the range of 50 microns to 200 microns, preferably the thin film check valve made of thermoplastic substrate has a thickness in the range of 80 microns to 150 microns.

[0016] In another aspect, the thermoplastic substrate is made of polyolefin, low density polyethylene, or preferably the thermoplastic substrate is made of linear low density polyethylene octene copolymer.

[0017] The objects and unique features of the present application, as well as other aspects thereof, will be more specifically set forth by the included examples and drawings, and the best mode will be further described. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A side view is shown according to one of the embodiments of the present application.

[0019] Figure 2 A top view of the opening is shown according to one of the embodiments of the present application.

[0020] Figure 3 A position of the internal structure is shown according to one of the embodiments of the present application.

[0021] Figure 4 A perspective view of the preferred thin film check valve according to the present disclosure is shown. DETAILED DESCRIPTION

[0022] To make the description more clear, examples will be described with reference to the attached drawings, in which Figure 1 A more detailed description of the application will be provided. The same parts in these drawings will be identified with the same reference numerals. However, the more detailed description provided does not limit the scope of the present application.

[0023] In this regard, the present application can be implemented or applied in a variety of ways. The present disclosure will provide different examples as a reference for implementations or applications with the same features. However, as described above, these do not have any limitation on the scope of the present application.

[0024] The tissue retrieval bag for retrieving tissue from a surgical site according to the present application comprises an elongated retrieval thread 101 having a proximal end and a distal end, a container 103 having a closed end 107 and an expandable open end 105, wherein at least a portion of the opening is arranged positioned adjacent to the distal end of the retrieval thread and at least one continuous portion of the open end is embossed, thereby forming a resilient structure in the shape of a torus 109 having a cross-sectional area as shown Figure 1 Figure 2 ​The illustrated container comprises a thin film check valve 201 configured in the form of a star structure 203 and the circumference of the thin film check valve when inflated upon receiving the tissue is equal to or greater than the open end of the container and partially, and the thin film check valve is configured to be partially adjacent to the circular ring, such that a conical shape can be formed when the thin film check valve is pushed upon receiving the tissue through the open end, and the conical shape has a height in the range of 15% to 60% of the height of the container, preferably in the range of 20% to 30% of the height of the container. The purpose of the thin film check valve is to prevent any accidental leakage, unless in the case where the removed tissue is pulled out by the doctor.

[0025] Figure 3 The position of the internal structure according to one of the embodiments of the present application is shown. Figure 4 A perspective view of a preferred thin film check valve according to the present disclosure is shown. In the Figure 4 The components, i.e. the planar ring 401, the conical slope 402 and the narrow polygonal slit 403 can be seen in the

[0026] The conical shape comprises a circular base arranged adjacent to the circular ring and a tip of the cone positioned downwards inside the container 301, the conical shape is configured such that the radius of the circular base is approximately the same as the radius of the open end of the container, and the conical height is in the range of 10% to 50% of the total height of the thin film check valve, and preferably in the range of 15% to 25% of the total height of the thin film check valve. In one possible embodiment, the thin film check valve can be attached with the circular ring by heat sealing or ultrasonic sealing method.

[0027] It should be noted that the star structure is a multi-vertex star structure, and the size of the multi-vertex star can be calculated according to the relationship between the number of vertices of the star and the length of the vertices of the star based on the following formula:

[0028] n(2L) = the circumference of the outlet end of the thin film check valve,

[0029] Pi(D) = the circumference of the inlet end of the thin film check valve,

[0030] wherein Pi = 3.1416,

[0031] D = the diameter of the open end of the bag,

[0032] n = the number of vertices of the star,

[0033] L = the length of the vertices of the star, wherein 2L = D

[0034] In one possible embodiment, the number of vertices of the star can be set to 3.

[0035] Additionally, in a preferred embodiment, the thin film check valve can be made of a thermoplastic substrate having a thickness in the range of 50 microns to 200 microns, preferably 80 microns to 150 microns. Such a thermoplastic substrate can be made of a polyolefin, low density polyethylene or preferably linear low density polyethylene octene copolymer.

[0036] Additionally, in one possible embodiment, the slit at the inlet end of the thin film check valve is in the range of 0.1 mm to 2.0 mm, preferably in the range of 0.2 mm to 1.0 mm. Since the outlet end is a thin film having a soft and foldable structure, any force applied from the inside of the bag to the outlet causes the outlet end to close and prevent any liquid or tissue from spilling out. Furthermore, the rigidity of the thin film check valve can not be the same and can vary according to the specified section or region. The thickness can also gradually decrease from the thickness of the inlet end towards the thickness of the outlet end.

[0037] The thickness at the inlet is in the range of 100 microns to 250 microns, and preferably in the range of 120 microns to 240 microns. The thickness gradually decreases as mentioned above towards the outlet end and becomes thinnest at the outlet end, in which the thickness is in the range of 20 microns to 60 microns, preferably in the range of 25 microns to 40 microns.

[0038] Although the present application has been described in detail with the aid of the accompanying drawings, it is to be understood that the application is not limited to the examples disclosed, but that there are alternatives with the scope of the application. The scope of the application is defined with the claims, and encompasses any alternatives which do not depart from the true spirit of the application.

[0039] Best mode of the application

[0040] As disclosed in the disclosure of the present application.

Claims

1. A tissue retrieval bag for removing tissue from a surgical site, the tissue retrieval bag comprising: An elongated extraction line (101) with a proximal end and a distal end; A container (103) having a closed end (107) and an expandable open end (105), wherein at least a portion of the open end (105) is arranged to be positioned adjacent to the distal end of the take-out line, and at least a continuous portion of the open end is embossed to form an elastic structure in the shape of an annulus (109) having a cross-sectional area. The container is characterized by comprising a membrane check valve (201) configured in a star-shaped structure (203), wherein the perimeter of the membrane check valve when receiving tissue is equal to or greater than the perimeter of the open end of the container, and the membrane check valve (201) is configured to be partially adjacent to the annulus, thereby enabling it to form a conical shape when the membrane check valve is actuated by receiving tissue through the open end, and the conical shape having a height in the range of 15% to 60% of the height of the container.

2. The tissue retrieval bag for removing tissue from a surgical site according to claim 1, wherein, The conical member includes a circular base arranged adjacent to the annulus and a cone tip (301) positioned downward inside the container. The conical member is configured such that the radius of the circular base is the same as the radius of the opening end of the container, and the height of the conical member is in the range of 10% to 50% of the total height of the diaphragm check valve.

3. The tissue retrieval bag for removing tissue from a surgical site according to claim 1 or 2, wherein, The star structure is a multi-vertex star structure, and the size of the multi-vertex star structure is calculated based on the following formula, according to the relationship between the number of vertices of the star structure and the length of the vertices of the star structure: n(2L) = the circumference of the outlet end of the diaphragm check valve. Pi(D) = the circumference of the inlet end of the diaphragm check valve. Where Pi = 3.1416, D = the diameter of the opening end of the tissue extraction bag. N = the number of vertices of the star-shaped structure. L = the length of the vertex of the star-shaped structure, where 2L = D.

4. The tissue retrieval bag for removing tissue from a surgical site according to claim 3, wherein, The star-shaped structure has 3 vertices.

5. The tissue retrieval bag for removing tissue from a surgical site according to claim 1 or 2, wherein, Thin-film check valves made from thermoplastic substrates have a thickness ranging from 50 micrometers to 200 micrometers.

6. The tissue retrieval bag for removing tissue from a surgical site according to claim 5, wherein, The thermoplastic substrate is made of polyolefin and low-density polyethylene.

7. The tissue retrieval bag for removing tissue from a surgical site according to claim 1, wherein, The height of the conical component is in the range of 20% to 30% of the height of the container.

8. The tissue retrieval bag for removing tissue from a surgical site according to claim 1 or 2, wherein, The height of the tapered component is in the range of 15% to 25% of the total height of the diaphragm check valve.

9. The tissue retrieval bag for removing tissue from a surgical site according to claim 1 or 2, wherein, Thin-film check valves made from thermoplastic substrates have a thickness ranging from 80 micrometers to 150 micrometers.

10. The tissue retrieval bag for removing tissue from a surgical site according to claim 5, wherein, The thermoplastic substrate is made of linear low-density polyethylene octene copolymer.

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