Medical systems, devices, and related methods

Abstract

In one example, the medical device may include a delivery tube configured to connect to a vacuum source and provide negative pressure to a distal portion of the delivery tube; and a porous body at the distal portion of the delivery tube, the porous body including a first section and a second section detachable from the first section.

Description

[0001] Cross-citation of relevant literature

[0002] This application claims the benefit of priority to U.S. Provisional Application No. 62 / 982,926, filed on February 28, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to medical systems, devices, and related methods that can be used to treat subjects. Aspects of this disclosure relate to medical systems, devices, and methods for endoscopic medical procedures, such as applying negative pressure to tissue to treat wounds. Background Technology

[0004] Endoscopic and open surgical procedures of the gastrointestinal tract (GI) include, for example, colectomy, bariatric surgery, esophagectomy, gastric bypass, and sleeve gastrectomy. These procedures can result in perforation, postoperative leakage, or wounds in other tracts. Treatment options for such wounds are limited, and morbidity and mortality are high. Options include surgical reoperation and endoscopic placement of stents or clips. Surgery is relatively invasive and also has high morbidity and mortality. Endoscopic stent placement is a less invasive option. However, the placed stent may migrate from its intended location and / or isolate infection at the treatment site, thus inhibiting drainage.

[0005] The systems, apparatus, and methods disclosed herein can correct some of the deficiencies described above, or solve other aspects of the present technology. Summary of the Invention

[0006] Among other things, embodiments of this disclosure relate to systems, apparatus, and methods for performing one or more medical procedures using medical systems and devices. Each example disclosed herein may include one or more features associated with any other disclosed example.

[0007] In one example, the medical system may include a delivery tube configured to connect to a vacuum source and provide negative pressure to a distal portion of the delivery tube; and a porous body at the distal portion of the delivery tube, the porous body including a first section and a second section detachable from the first section.

[0008] In other aspects of this disclosure, the medical system may include one or more of the following features: A second segment may extend circumferentially around the radially outermost surface of a first segment, and the radially outermost surface may be radially outermost from the central longitudinal axis of the porous body. The system may further include a cord coupled to the second segment and extending from the porous body to a proximal portion of the delivery tube. The porous body may further include a third segment extending circumferentially around the radially outermost surface of the second segment, and the radially outermost surface of the second segment may be radially outermost from the central longitudinal axis of the porous body. The system may further include a first cord coupled to the second segment and extending from the porous body to a proximal portion of the delivery tube; and a second cord coupled to the third segment and extending from the porous body to a proximal portion of the delivery tube. The delivery tube may be coupled to a vacuum source, the porous body may be cylindrical, and the central longitudinal axis of the porous body may be longitudinally aligned with the central longitudinal axis of the delivery tube. The system may further include a flexible outer sheath coupled to the second segment, and the delivery tube may extend through a cavity of the flexible outer sheath.

[0009] In other aspects of this disclosure, the medical system may include one or more of the following features: A first segment may be cylindrical, and a second segment may surround the first segment. The first and second segments may be separated by perforations. The first segment may be cylindrical and may include a central longitudinal axis; the second segment may extend circumferentially around a radially outermost surface of the first segment, the radially outermost surface being radially outermost from the central longitudinal axis of the first segment; the second segment may be cylindrical and include a cavity extending through the central longitudinal axis, the cavity being configured to receive the first segment. A layer of mesh, adhesive, or pharmaceutical agent may be positioned between the first and second segments. The system may further include a cylindrical outer sheath extending around a delivery tube and a porous body, and the outer sheath may be configured to cover the porous body and the delivery tube. The system may further include a cord connected to the second and third sections, the cord extending from the sponge to a proximal portion of the delivery tube, and wherein the cord comprises: a first portion connected to the second and third sections, wherein the length of the first portion is greater than the length of the delivery tube; and a second portion connected to the third section and extending proximal to the proximal portion of the delivery tube. The first, second, and third sections may be concentric and may have different thicknesses measured orthogonally to the central longitudinal axis of the porous body. The first cord may have a different color than the second cord.

[0010] In another aspect, the medical device may include a porous body comprising at least one perforation; a negative pressure catheter having an opening formed in fluid communication with the porous body, wherein the negative pressure catheter is configured to apply negative pressure to the porous body; and a cord connected to the porous body and extending from the porous body to a proximal portion of the catheter. The porous body may be configured to separate into separate segments when the cord is pulled proximally.

[0011] In other aspects of this disclosure, the device may include one or more of the following features: At least one perforation may extend longitudinally along the porous body. A conduit may be longitudinally aligned with a central cylindrical segment of the porous body, and at least one perforation may extend parallel to the longitudinal axis of the central segment. The at least one perforation may include a first perforation and a second perforation; the first perforation may be closer to the central longitudinal axis of the porous body than the second perforation.

[0012] In another aspect, the method of performing the medical procedure may include: locating tissue adjacent to the target site of the porous body; applying negative pressure to the porous body; and pulling a thin string connected to the porous body proximally to remove a first segment of the porous body while a second segment of the porous body remains located at the target site.

[0013] It is understood that, as intended, the foregoing general description and the following detailed description are merely exemplary and illustrative, and are not intended to limit the scope of this disclosure. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate exemplary aspects of this disclosure and, together with the description, serve to illustrate the principles of this disclosure.

[0015] Figure 1 A perspective view illustrating the distal portion of an exemplary medical device according to various aspects of this disclosure is provided.

[0016] Figure 2 A perspective view illustrating the distal portion of an exemplary medical device according to various aspects of this disclosure is provided.

[0017] Figure 3 A perspective view illustrating the distal portion of an exemplary medical device according to various aspects of this disclosure is provided.

[0018] Figures 4A-4D This provides a view illustrating the various stages of the use of the medical device on a subject, based on various aspects of this disclosure. Detailed Implementation

[0019] The terms “proximal” and “distal” are used herein to refer to the relative positions of components of the exemplary medical systems and devices. When used herein, “proximal” refers to a position relatively closer to the exterior of the body or closer to a medical professional using the medical system or device. In contrast, “distal” refers to a position relatively farther from a medical professional using the medical system or device, or closer to the interior of the body. The proximal and distal directions are indicated throughout the figures by arrows labeled “P” and “D”, respectively. As used herein, the terms “comprising,” “containing,” “having,” “including,” or other variations thereof are intended to cover non-exclusive inclusion, such that a system, device, or method that comprises a list of elements does not necessarily include only those elements, but may include other elements not expressly listed or inherent to it. Unless otherwise stated, the term “exemplary” is used in the sense of “example” rather than “ideal.” As used herein, the terms “about,” “substantially,” and “approximately” indicate values ​​within a range of + / -10% of the stated value.

[0020] Endocavitary vacuum therapy (EVAC) has been proposed. In EVAC, negative pressure is delivered to the site of a wound in the digestive tract, for example, through a nasogastric tube with a sponge at its end. The sponge is inserted through an endoscope into a perforation, leak, or other wound. Negative pressure is then applied. However, suitable devices and systems for EVAC are limited.

[0021] Embodiments of this disclosure include devices, systems, and methods for endocavitary vacuum therapy (EVAC). In examples, EVAC involves placing a sponge or other similar material into a cavity at a wound site, including perforations, cysts, leaks, anastomoses, etc. The material can be placed via a catheter, endoscope (endoscope, bronchoscope, colonoscope, gastroscopy, duodenoscope, etc.), tube, or sheath, inserted through a natural orifice into the GI tract. The orifice can be, for example, the nose, mouth, or anus, and placement can be in any part of the GI tract, including the esophagus, stomach, duodenum, large intestine, or small intestine. It can also be placed in other organs accessible via the GI tract.

[0022] Reference will now be made in detail to embodiments of the present disclosure as described above, and illustrated in the accompanying drawings. Where possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts.

[0023] Figure 1 A perspective view of an exemplary medical device 100, including a sponge 102, is illustrated. This device can be used to aid in the healing of internal wounds, anastomoses, or the like in a subject. The sponge 102 may be generally cylindrical and may be attached, for example, to a vacuum tube 104. The central longitudinal axis A of the sponge 105 may be aligned with the central longitudinal axis of the vacuum tube 104 (in... Figure 1Also shown in the diagram is alignment with axis A). The size of the sponge 102 may be determined according to the patient's anatomy and may include a cavity or recess (not shown) for receiving the vacuum tube 104. This recess may be located at the proximal end of the sponge 102. In some examples, the sponge 102 may include a curved, radially outermost surface. The sponge 105 may be flexible and configured to move through a tortuous path through the patient's body cavity.

[0024] The sponge 102 may include multiple concentric segments 116, 114, 112, 110, and 108. Each segment 116, 114, 112, 110, and 108 may be separate from the other segments 116, 114, 112, 110, and 108. The central segment 116 may be formed into a cylinder and may be directly connected to the vacuum tube 104. For example, the length of segment 116 may be less than that of segments 114, 112, 110, and 108 to accommodate the distal portion of the tube 104 within the sponge 102. The other segments 114, 112, 110, and 108 may each extend circumferentially around the central segment 116, forming concentric, annular cylindrical segments 114, 112, 110, and 108, which are nested together. In some examples, each segment 116, 114, 112, 110, 108 of the sponge 102 may have a different distance from the central longitudinal axis A, and each segment 116, 114, 112, 110, 108 may extend longitudinally along the direction of the central longitudinal axis A. In some examples, segments 116, 114, 112, 110, 108 may have the same thickness measured in a direction perpendicular to the longitudinal axis A, and segments 114, 112, 110, 108 may have the same length parallel to the longitudinal axis A. In some examples, the sponge 102 may include five segments (e.g., Figure 1 (As shown), in other examples, sponge 102 may include 2, 3, 4, 6, 7, 8, 9 or any other suitable number of segments. Each segment 114, 112, 110, 108 may contact the radial outer surface from the longitudinal axis A of the adjacent segments 116, 114, 112, 110, respectively.

[0025] Segments 116, 114, 112, 110, and 108 can be configured to move relative to each other, such that one segment 116, 114, 112, 110, or 108 can move relative to the other segments 116, 114, 112, 110, or 108 in a proximal-distal direction, while the other segments 116, 114, 112, 110, or 108 do not move or move very little. In some examples, a mesh, adhesive, or agent can be placed between each segment 116, 114, 112, 110, or 108 and adjacent segments 116, 114, 112, 110, or 108 to facilitate the removal of each segment 116, 114, 112, 110, or 108. In other examples, any other suitable material can be used between adjacent segments, capable of connecting adjacent segments together but allowing them to be released from each other under appropriate force. This material may include a suitable adhesive layer sandwiched between adjacent portions. In some examples, the medication may be layered / sandwiched between adjacent segments, and the medication may be configured to be released from the sponge 102 when the radially outer layer on the longitudinal axis of the sponge 102 is removed, exposing the medication layer. In some examples, the sponge 102 may be sized to fill a wound area 450 with a radius of approximately 1 cm to 7 cm and / or a depth of approximately 1 cm to 7 cm.

[0026] In embodiments of this disclosure, the sponge 102 can be any suitable biocompatible material capable of absorbing liquids and / or allowing liquids to pass through it via negative pressure. The material can be flexible, compressible, porous, hydrophilic, sterile, biodegradable, and / or disposable. The sponge material can be an open-cell foam with pores and channels. Suitable materials include polyurethanes, esters, ethers, composites, and any medical-grade material.

[0027] A string or suture 106 may be connected to the sponge 102 and may extend proximally from the sponge 102 to the proximal portion of the medical device 100. The string 106 may be connected to each of the segments 108, 110, 112, and 114 except for the central segment 116. Between each point where the string 106 is connected to each segment 108, 110, 112, and 114, the length of the string 106 may be longer than the length of the medical device 100 (measured longitudinally), allowing each segment 108, 110, 112, and 114 to pull the entire length of the medical device 100 proximally without pulling any other segments 108, 110, 112, and 114. The length of the string 106 between each point connecting to each segment 108, 110, 112, and 114 may be sandwiched between adjacent segments 108, 110, 112, and 114. For example, string 106 can be connected to segment 108, then to segment 110, then to segment 112, and then to segment 114; and the length of string 106 between each point of connection to each segment can be positioned between the segments (e.g., around a segment). This extra length of string 106 between each segment 108, 110, 112, 114 is configured to allow the user to pull segment 108 proximally out of the patient's body without removing the remaining portions of segments 110, 112, 114, 116; and then continue pulling the next radially outermost segment (in this case, segment 110) proximally out of the patient's body without moving the remaining portions of segments 112, 114, 116; and so on.

[0028] In some examples, the medical device 100 may include a single, individual cord attached to each segment 108, 110, 112, 114; and thus four cords 106 extend proximally from the sponge 102. In some examples, the medical device 100 may include a single cord 106 attached to each segment 108, 110, 112, 114, and each cord 106 may be a different color so that the user can identify which layer is being removed when removing layers (segments 108, 110, 112, 114) of the sponge 102. In other examples, the cords 106 may be replaced with thread, tethers, or compression material. In some examples, the cords 106 may be replaced with a series of concentric tubes extending from the sponge 102 to the proximal portion of the medical device 100, each tube being attached to a single segment 108, 110, 112, 114. In this example, these tubes are flexible and configured to move through the patient's body.

[0029] Vacuum tube 104 may be cylindrical and have a central cavity (not shown) extending along its central longitudinal axis A. Vacuum tube 104 may have a length and width configured to extend through a working channel of an endoscope or other medical delivery device and may be flexible. In some examples, vacuum tube 104, including a portion within sponge 102, may include one or more holes at its distal portion. Vacuum tube 104 may be coupled to vacuum source 120 at its proximal portion. Vacuum source 120 may provide negative pressure to vacuum tube 104. Vacuum tube 104 may be coupled to at least the central portion 116 of sponge 102 and may provide negative pressure to sponge 102. In some examples, vacuum tube 104 may extend through the central portion 116 of sponge 102. Vacuum tube 104 may be received within a recess in the proximal portion of sponge 102, and in some examples, vacuum tube 104 may be coupled to sponge 102 by adhesive, suture, thread, and / or other attachment methods.

[0030] In some examples, the medical device 100 may include an outer sleeve (not shown) that extends onto the vacuum tube 104 and the sponge 102. The outer sleeve can compress the sponge 102 such that the radially outermost surface of the sponge 102 along its longitudinal axis A is smaller than when the sponge 102 is outside the outer sleeve. The outer sleeve facilitates the movement of the medical device 100 through the working channel of an endoscope or other medical device. Furthermore, the outer sleeve prevents the sponge 102 from making unwanted contact with the patient's tissues.

[0031] Figure 2 A perspective view of the distal portion of another embodiment of medical device 200 is shown. Medical device 200 may have any of the features described herein with respect to medical device 100. Medical device 200 may include a vacuum tube 204 and a sponge 202, and may be coupled to a vacuum source 220 at the proximal portion of medical device 200. In the same manner as described above with respect to sponge 102, sponge 202 includes concentric cylindrical segments 212, 214, 216. At least the central segment 216 is directly coupled to vacuum tube 204, segment 214 is coupled to a first cord 223, and segment 212 is coupled to a second cord 221. Each of the first cord 223 and the second cord 221 may extend from sponge 202 to the proximal portion of medical device and may be configured to move proximally to remove segments 212, 214 of sponge 202 from the patient's body. In some examples (e.g.) Figure 2 As shown), strings 221 and 223 can be connected to each segment 212 and 214 at the proximal portion of each segment 212 and 214, respectively. Strings 221 and 223 can extend proximal to the outside of the vacuum tube 204.

[0032] Figure 3A perspective view of the distal portion of another embodiment of medical device 300 is shown. Medical device 300 may have any of the features described herein with respect to medical devices 100 and 200. Medical device 300 may include a vacuum tube 304, a sponge 302, and a string 306. Vacuum tube 304 may be connected to a vacuum source 320 at a proximal portion. Sponge 302 may include several segments 331, 332, 333, 334, 335, and 336, and these segments 331, 332, 333, 334, and 335 may be coiled around a central segment 336. Each segment 331, 332, 333, 334, and 335 may be coiled around that segment or adjacent segments and / or radially inward segments, and segments 331, 332, 333, 334, 335, and 336 may form a spiral around the central longitudinal axis of sponge 302. In some examples, a single rectangular sponge can be perforated to divide the sponge into segments 331, 332, 333, 334, 335, and 336, and then the rectangular sponge can be arranged around a central segment (such as...). Figure 3 The middle section 336 is rolled up to form a sponge 302. The string 306 can be connected to each section 331, 332, 333, 334, 335, 336, wherein the length of the string is the length of the medical device 300 between each point where the string 306 is connected to each corresponding section 331, 332, 333, 334, 335, 336.

[0033] Adjacent segments 331, 332, 333, 334, 335, and 336 can be separated by perforations 361, 362, 363, 364, and 365. Perforations 361, 362, 363, 364, and 365 can be configured to allow segments 331, 332, 333, 334, 335, and 336 to separate from each other when the user pulls the string 306 proximally. For example, when the user first pulls the string 306 proximally, segment 331 can be pulled proximally, and perforation 361 can allow segment 331 to separate from segment 332 without moving or minimizing movement of segment 332 or any other segment. The user can then continue to pull the string 306 proximally to separate segment 332 from segment 333, then segment 333 from segment 334, and so on. In other examples, individual strings 306 may be connected to each segment 331, 332, 333, 334, 335, 336, requiring the user to pull one string to remove segment 331, then pull a second string to remove segment 332, and so on. In some examples (not shown), the central segment 336 may be a sponge independent of sponge 302. Perforations 361, 362, 363, 364, 365 may extend longitudinally substantially parallel to axis A. In other examples, perforations 361, 362, 363, 364, 365 may be replaced by a thinner area or other weakened areas between each segment 331, 332, 333, 334, 335, 336, allowing release of adjacent segments 331, 332, 333, 334, 335, 336 when appropriate force is applied. Each segment 331, 332, 333, 334, 335, and 336 can be of any suitable size. In some examples, each segment 331, 332, 333, 334, 335, and 336 can extend 360° circumferentially around the central longitudinal axis of the vacuum tube 304. In other examples, each segment 331, 332, 333, 334, 335, and 336 can extend less than 360° circumferentially around the axis, similar to... Figure 3 The section 331 is shown. Perforations 361 and 362 provide a way for a user to select the size of the sponge 302 before inserting it into the patient's body. Additionally, a mesh, adhesive, pharmaceutical agent, or other material, as described above, can be used between adjacent sections 331, 332, 333, 334, 335, and 336.

[0034] Now please refer to the detailed operating methods for medical devices 100, 200, and 300. Although Figures 4A-4D The operation of medical device 100 is shown. Any medical device 100, 200, or 300 can be operated in the same manner as described below regarding medical device 100.

[0035] Figures 4A-4DA side view of a medical device 100 used within a patient's body cavity 452 (e.g., a portion of the gastrointestinal tract) to treat a wound area 450 is shown. To position the medical device 100 at the wound area 450 within the patient's body, a user can insert an endoscope (or other medical device) into the patient and visually locate the wound area 450 using an image sensor (not shown) at the distal end of the endoscope. Once the endoscope is positioned proximally to the wound area 450, the user can insert the medical device 100 into the working channel of the endoscope and move the medical device 100 distally through the working channel. In other examples, the medical device 100 may be positioned within the working channel proximal to the distal end of the endoscope before insertion into the patient's body. In some examples, an outer sheath may be provided between the medical device 100 and the working channel, and the sheath may prevent excessive bending, twisting, or other deformation of the medical device 100 within the working channel while the user moves the medical device 100 distally through the working channel. In other examples, users can insert the medical device 100 directly into the patient's body without using an endoscope, instead of within a separate working channel of the medical device.

[0036] With the distal portion of the endoscope located proximal to the wound region 450, the user can move the medical device 100 distally out of the working channel and place the sponge 102 within the wound region 450. The flexibility, compressibility, and shape of the sponge 102, along with the flexibility of the vacuum tube 104, facilitate the manipulation of the medical device 100 within the wound region 450. In some examples, the sponge 102 can be bent, twisted, and / or reshaped to conform to the shape of the wound region 450. The user can then activate the vacuum source 120 to provide negative pressure to the sponge 102 through the vacuum tube 104, which can pull a portion of the wound region 450 toward the sponge 102. Once the medical device 100 is placed within the wound region 450 and a vacuum pressure is applied to the sponge 102, the user can leave the sponge 102 and vacuum tube 104 in place within the patient for approximately 48-72 hours. The negative pressure applied to the sponge 102 can also remove fluids and other substances from the wound region 450. In other examples, the sponge 102 can remain in the patient's body for any duration. During treatment, the vacuum tube 104 may remain inside the patient and may exit through the patient's rectum, mouth, nose, other body orifices, or other openings on the patient's body such as incisions, extending to the vacuum source 120. In some examples, the outer sheath may also remain inside the patient during treatment and may cover a portion of the sponge 102 outside the wound area 45.

[0037] As the wound area 450 heals, it may shrink and become smaller. When the user wants to remove a section of sponge 102 (e.g., 48-72 hours after the sponge 102 was initially positioned in the wound area), the user can first disconnect the vacuum tube 104 from the vacuum source 120 and supply saline 460 to the vacuum tube 104 to deliver saline 460 to the wound area 450. Figure 4B The deployment of saline 460 within the wound area 450 is described. Although Figure 4B The diagram shows saline solution 460, but any suitable liquid known in the art can be used to fill the wound area 450 to facilitate the removal of a portion of the sponge 102. Saline solution 460 can facilitate the release of the sponge 102 from the walls of the wound area 450. Once the saline solution 460 is deployed, the user can place a rigid tool 458 inside the patient, with the distal end of the rigid tool 458 contacting the segment 110 of the sponge 102. The rigid tool 458 prevents the segment 110 from moving proximally when the user pulls the segment 108 proximally. The rigid tool 458 can be a wire, tube, rod, or any other suitable relatively rigid component.

[0038] After filling the wound area 450 with saline 460 and positioning the rigid tool 458 to engage with the segment 110, the user can then pull the string 106 proximally to pull the segment 108 proximally and remove the segment 108 from the wound area 450. Figure 4C The image shows a segment 108 that is pulled proximally out of the wound area 450, and a rigid tool 458 that contacts the segment 110 to prevent the segment 110 from moving proximally. Although Figure 4C The use of the rigid tool 458 is shown, but the user can remove segment 108 by simply pulling the thin string 106 proximally without the aid of the rigid tool 458. After segment 108 is removed from the patient, the user can reconnect and activate the vacuum source 120 to provide negative pressure to the sponge 102, and the tissue in the wound area 450 can be pulled toward segment 110 (e.g., Figure 4D (As shown). This allows the sponge 102 to occupy less space within the wound area 450, and also allows the wound area 450 to continue to shrink in size as it heals. The user can repeat these steps until the central segment 116 is completely exposed within the wound area 450, and then the user can completely remove the medical device 100 from the patient after treatment. Note that the central segment 116 can be removed from the patient's body by pulling the vacuum tube 104 proximally.

[0039] When treating tissue with any of the medical devices 100, 200, or 300 described herein, it may be beneficial to remove a portion of the sponge after the patient's tissue has crusted over or otherwise healed. By removing a segment of sponge 102, 202, or 302 from the crusted tissue area, allowing a new sponge segment (or a portion of sponge that has not yet come into contact with the treated tissue) to engage with the tissue, the tissue may heal more quickly.

[0040] although Figures 4A-4D This disclosure describes the use of sponge 100 in treating wound areas within a patient's body, but it is not limited to this. Sponges 102, 202, 302, and the processes discussed herein can be used to treat wounds, leaks, perforations, etc., in the upper digestive tract, lower digestive tract, other cavities or hollows within the body, or externally. The aspects discussed herein can help reduce recovery time, reduce physician intervention, reduce the need for and / or reliance on imaging or visualization of the sponge, reduce component costs, and reduce risks to the subject, etc.

[0041] Furthermore, the aspects discussed in this article can be packaged into kits for use in treating subjects.

[0042] While the principles of this disclosure have been described herein with reference to illustrative aspects of a particular application, it should be understood that this disclosure is not limited thereto. Those skilled in the art and who can access the teachings provided herein will recognize that additional modifications, applications, aspects, and equivalent substitutions fall within the scope of the aspects described herein. Therefore, this disclosure should not be construed as limited by the foregoing description.

Claims

1. A medical system, the medical system comprising: A delivery tube, configured to be connected to a vacuum source and to provide negative pressure to a distal portion of the delivery tube; A porous body located at the distal portion of the delivery pipe, wherein the porous body includes a first porous section and a second porous section detachable from the first porous section; and A thin rope, which is connected to the second porous section and extends from the porous body to the proximal portion of the delivery tube.

2. The medical system of claim 1, wherein the second porous segment extends circumferentially around the radially outermost surface of the first porous segment, wherein the radially outermost surface is radially outermost from the central longitudinal axis of the porous body.

3. The medical system of claim 1, wherein the porous body further comprises a third porous section extending circumferentially around the radially outermost surface of the second porous section, wherein the radially outermost surface of the second porous section is radially outermost from the central longitudinal axis of the porous body.

4. The medical system of claim 1, wherein the delivery tube is connected to a vacuum source, the porous body is cylindrical, and the central longitudinal axis of the porous body is longitudinally aligned with the central longitudinal axis of the delivery tube.

5. The medical system of claim 1, further comprising a flexible outer sheath connected to the second porous segment, wherein the delivery tube extends through the cavity of the flexible outer sheath.

6. The medical system of claim 1, wherein the first porous segment is cylindrical, and the second porous segment surrounds the first porous segment.

7. The medical system of claim 6, wherein the first porous segment and the second porous segment are separated by perforations.

8. The medical system of claim 1, wherein the first porous segment is cylindrical and includes a central longitudinal axis; wherein the second porous segment extends circumferentially around a radially outermost surface of the first porous segment, wherein the radially outermost surface is radially outermost from the central longitudinal axis of the first porous segment; and wherein the second porous segment is cylindrical and includes a cavity extending through the central longitudinal axis, the cavity being configured to receive the first porous segment.

9. The medical system of claim 1, wherein a layer of mesh, adhesive, or agent is positioned between the first porous segment and the second porous segment.

10. The medical system of claim 1, further comprising a cylindrical outer sheath extending around the delivery tube and the porous body, wherein the outer sheath is configured to cover the porous body and the delivery tube.

11. The medical system of claim 3, wherein the cord is further connected to the third porous segment and comprises: A first portion connected to the second porous section and the third porous section, wherein the length of the first portion is greater than the length of the conveying pipe; and A second portion that is connected to the third porous section and extends proximally to the proximal portion of the delivery tube.

12. The medical system of claim 3, wherein the first porous segment, the second porous segment, and the third porous segment are concentric.

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