A controllably stepwise removable drainage catheter

Abstract

The application relates to a controllable step-by-step removal type drainage catheter, belonging to the technical field of medical devices. The drainage catheter comprises at least two drainage pipe fittings which are arranged in a telescopic mode; a central control rod which is movably arranged in the drainage pipe fittings in an axial direction; when the central control rod is pushed to the end position in the first direction, the first abutting structure abuts against the second abutting structure, so that the at least two drainage pipe fittings are kept in a rigid state of mutual stretching; the central control rod is provided with a retraction structure, and the drainage pipe fittings are all provided with driven structures which can be driven by the retraction structure. Repetitive tearing trauma caused by the traditional daily tube extraction method is completely avoided.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a controllable, step-by-step removable drainage catheter. Background Technology

[0002] A drainage catheter is a widely used medical device in clinical practice. Its main function is to drain accumulated fluid, pus, blood, or gas from the body to relieve local pressure, prevent infection, and promote tissue healing.

[0003] However, in certain surgical procedures, especially in the drainage of deep abscesses or the management of postoperative dead space, the use of existing drainage tubes faces significant challenges. The healing of these cavities must follow a specific pathophysiological principle: centripetal healing from the base to the surface. New granulation tissue must grow from the deepest part of the cavity (distal), gradually filling it and eventually healing to the body surface (proximal). If, during the healing process, superficial wounds heal too quickly while deep cavities remain unclosed, residual fluid or pus will be trapped inside, easily leading to recurrent infection or the formation of chronic sinus tracts.

[0004] Current techniques typically employ a daily tube removal method (or segmented tube removal method). The procedure involves the doctor first inserting a long drainage tube into the deepest part of the abscess cavity. Then, based on imaging assessments of the healing progress, the tube is forcibly pulled outwards by a fixed length each day (e.g., 1-2 cm). The purpose of this procedure is to allow the deepest cavity to collapse and close after the drainage tube is removed, creating space for new granulation tissue to heal and guiding the healing process towards the body surface.

[0005] However, traditional drainage tubes are monolithic structures, and their walls (especially the side holes for drainage) inevitably adhere to newly formed granulation tissue during placement. When doctors perform daily tube removal, they are not simply moving the tip, but rather dragging the entire tube through the sinus tract with high friction. This operation forcibly tears away healthy tissue that has begun to heal, causing extremely severe pain and secondary bleeding to the patient. It is a daily repetitive secondary trauma that severely interferes with the healing process. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this invention provides a controllable, step-by-step removal drainage catheter.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A controllable, step-by-step removal drainage catheter is provided, comprising:

[0009] At least two nested drainage tubes;

[0010] A central control rod that can be axially movable and inserted inside the drainage tube;

[0011] The central control rod is provided with at least one first abutting structure, and the drainage tube is provided with a corresponding second abutting structure.

[0012] When the central control lever is pushed to the end position in the first direction, the first abutting structure abuts against the second abutting structure, so that at least two of the drainage tubes remain in a rigid state of mutual extension;

[0013] Furthermore, the central control rod is equipped with a retractable structure, and each of the drainage pipes is equipped with a driven structure that can be driven by the retractable structure.

[0014] When the central control lever is pulled in a second direction opposite to the first direction, the retraction structure sequentially drives the driven structure of the drainage tube, so that the inner drainage tube gradually retracts into the inner cavity of the outer drainage tube.

[0015] Preferably, it includes:

[0016] An external locking device is provided on the drainage tube to lock the central control lever relative to the drainage tube in multiple axial positions.

[0017] Preferably, the external locking device includes:

[0018] A locking seat is fixed to the proximal end of the outermost drainage tube of the drainage tube fitting, and the locking seat has a pin hole.

[0019] Locking pin;

[0020] The central control lever has a plurality of axially distributed positioning holes at its proximal end. The locking pin can pass through the pin hole and be inserted into one of the plurality of positioning holes to lock the central control lever.

[0021] Preferably, the first abutment structure includes at least one pusher protrusion disposed on the central control rod body and spaced apart along its axial direction;

[0022] The second abutment structure includes a force-bearing protrusion disposed on the inner wall of the drainage tube and corresponding to the propulsion protrusion.

[0023] Preferably, the retraction structure includes a retraction baffle disposed at the distal end of the central control lever;

[0024] The driven structure includes a tail flange disposed at the distal end of the drainage pipe fitting, and the retractable baffle can abut against and drive the tail flange.

[0025] Preferably, each of the drainage tubes has at least one drainage port on its sidewall, and when the inner drainage tube is retracted into the inner cavity of the outer drainage tube, the drainage port of the inner drainage tube corresponds to the drainage port of the outer drainage tube, so as to connect the drainage port of the outer drainage tube with the inner cavity of the inner drainage tube.

[0026] Preferably, it includes:

[0027] A sealing structure is provided between the outer wall of the inner drainage tube and the inner wall of the outer drainage tube, for sealing the annular gap between the drainage tubes.

[0028] Preferably, the central control rod is a hollow tube that defines a central channel;

[0029] Furthermore, the distal end of the central control lever is provided with at least one opening that communicates with the central channel.

[0030] Preferably, it includes:

[0031] A fixation balloon is positioned at the distal end of the central control rod, and the fixation balloon communicates with the opening.

[0032] Preferably, the central channel includes:

[0033] The first sub-channel is connected to the fixed balloon and is used to inflate or deflate the fixed balloon.

[0034] and a second sub-channel, wherein the distal end of the central control lever is provided with at least one flushing port connected to the second sub-channel.

[0035] This invention provides a controllable, step-by-step removal drainage catheter. The beneficial effects of this invention are as follows:

[0036] The drainage catheter utilizes two opposing axial movements of pushing and pulling on the same central control rod, allowing medical staff to retract the deep sections of the catheter step by step according to the patient's actual healing progress. This aligns with the principle of healing the abscess cavity from deep to shallow, while completely avoiding the repetitive tearing trauma caused by the traditional method of removing the catheter day by day. Attached Figure Description

[0037] Figure 1 This is one of the main views of the controllable step-by-step removal drainage catheter proposed in this invention;

[0038] Figure 2 This is a second front view of the controllable, step-by-step removal drainage catheter proposed in this invention.

[0039] Figure 3This is a front sectional view of the controllable step-by-step removal drainage catheter proposed in this invention;

[0040] Figure 4 for Figure 3 A magnified view of a portion at point A;

[0041] Figure 5 This is a schematic diagram of the central control rod of the controllable step-by-step removal drainage catheter proposed in this invention;

[0042] Figure 6 This is a schematic diagram of the retraction structure of the controllable step-by-step removal drainage catheter proposed in this invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Drainage tube fitting; 2. Central control rod; 201. Central channel; 2011. First sub-channel; 2012. Second sub-channel; 301. First abutment structure; 302. Second abutment structure; 401. Retraction structure; 402. Driven structure; 5. External locking device; 501. Locking seat; 502. Locking pin; 6. Drainage port; 7. Sealing structure; 8. Fixing balloon. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figures 1-6 As shown, the specific embodiments provided by the present invention are as follows:

[0047] like Figures 1 to 3 As shown, an embodiment of the present invention proposes a controllable, step-by-step removal drainage catheter. This embodiment's drainage catheter includes at least two nested drainage tubes 1, such as an inner drainage tube 1 and an outer drainage tube 1 sleeved outside the inner drainage tube 1. It also includes a central control rod 2, which is axially movable and passes through the inner cavity of the drainage tube 1.

[0048] The drainage catheter must have the following characteristics: first, it must maintain a rigidly extended state when inserted into the body; second, when needed, it must allow the inner drainage tube 1 to retract into the outer drainage tube 1 in stages.

[0049] To achieve rigidity during insertion, the central control rod 2 is provided with at least one first abutment structure 301, and the drainage tube 1 is provided with a corresponding second abutment structure 302. During catheter placement, the operator can push the central control rod 2 to its distal position in a first direction (e.g., towards the distal or deeper end). In this position, the first abutment structure 301 on the central control rod 2 abuts against and holds the second abutment structure 302 on the drainage tube 1. This rigid mechanical abutment allows the thrust applied to the central control rod 2 to be effectively transmitted to all drainage tubes 1, thus keeping the at least two nested drainage tubes 1 as a whole in a fully extended, rigid state. This ensures that the catheter will not unexpectedly collapse or retract due to resistance when passing through tissue.

[0050] To achieve a controllable, step-by-step removal function, the central control lever 2 is also equipped with a retraction structure 401, and each drainage tube 1 is equipped with a driven structure 402 that can be driven by the retraction structure 401. When it is clinically determined that the deepest drainage has been completed and the innermost drainage tube 1 needs to be retracted, the operator can pull the central control lever 2 in a second direction opposite to the first direction (e.g., towards the proximal end or outside the body).

[0051] During the pulling process, the retraction structure 401 on the central control lever 2 will first contact and drive the driven structure 402 on the innermost drainage tube 1. As the central control lever 2 is pulled further in the second direction, the driven innermost drainage tube 1 will move backward and smoothly retract into the inner cavity of its outermost drainage tube 1. When further retraction is required, the operator can continue to pull the central control lever 2. At this time, the retraction structure 401 will then drive the driven structure 402 of the next (i.e., the original outermost) drainage tube 1, causing it to also retract into the outermost drainage tube 1.

[0052] Furthermore, if it is found that the deep tissue that was originally healed has started to leak again, the central control lever 2 can be pushed in the first direction to make the inner drainage tube 1, which was originally retracted, return to the drainage position.

[0053] In this way, the drainage catheter in this embodiment utilizes the two opposite axial movements of pushing and pulling on the same central control rod 2, allowing medical staff to retract the deep tube segment step by step according to the patient's actual healing progress, thereby conforming to the healing principle of the abscess cavity from deep to shallow, while completely avoiding the repetitive tearing trauma caused by the traditional daily tube removal method.

[0054] In a preferred embodiment, the drainage catheter of the present invention further includes an external locking device 5.

[0055] Specifically, the external locking device 5 is disposed on the drainage tube 1 (specifically, usually disposed at the proximal handle of the outermost drainage tube 1), and its function is to releasably lock the central control lever 2 relative to the drainage tube 1 at multiple different axial positions.

[0056] First, when the central control lever 2 is pushed to its end position in the first direction to keep the drainage tube 1 in a rigid extended state, the operator can activate the external locking device 5 to securely lock the central control lever 2 in this position. This ensures that the rigidity is reliably maintained throughout the insertion process, completely preventing accidental retraction due to changes in the operator's hand strength or tissue resistance.

[0057] Of course, after the placement procedure is completed, the drainage tube 1 is completely wrapped and fixed by the surrounding tissue, so there is no need to maintain the rigid contact between the first abutment structure 301 and the second abutment structure 302. Secondly, when the operator pulls the central control lever 2 in the second direction, causing the inner drainage tube 1 to retract to the designated position (for example, the innermost tube has been completely retracted into the next outermost tube), the operator can reactivate the external locking device 5. This fixes the central control lever 2 and the retracted tube in their current retracted position, preventing them from accidentally extending or excessively retracting due to internal pressure or patient movement, thus ensuring the accuracy and safety of the step-by-step removal.

[0058] In a preferred embodiment, the external locking device 5 includes a locking seat 501 and a locking pin 502.

[0059] Specifically, the locking seat 501 is fixed to the proximal end of the outermost drainage tube 1 of the drainage tube 1 (for example, fixed to the operating handle). The locking seat 501 has a pin hole.

[0060] Accordingly, the proximal end (i.e., the handle operating end) of the central control lever 2 is provided with a plurality of spaced-apart positioning holes along its axial direction (length direction). The positions of these positioning holes correspond to several key axial positions of the conduit, such as the "fully extended" state, the "inner layer tube retracted" state, and the "secondary inner layer tube retracted" state.

[0061] In actual operation, when the operator moves the central control lever 2 to any of the aforementioned key positions, the positioning hole corresponding to that position will align with the pin hole on the locking seat 501. At this time, the operator only needs to pass the locking pin 502 through the pin hole of the locking seat 501 and insert it into the positioning hole of the central control lever 2. This completely prevents any accidental axial displacement of the central control lever 2 after locking.

[0062] In a preferred embodiment, the first abutment structure 301 is specifically manifested as at least one pusher protrusion disposed on the central control rod 2. When there are multiple drainage tubes 1 (e.g., inner, middle, and outer three layers), these pusher protrusions are preferably distributed at intervals along the axial direction of the central control rod 2, with each pusher protrusion corresponding to one drainage tube 1.

[0063] Accordingly, the second abutment structure 302 is specifically manifested as a force-bearing protrusion provided on the inner wall of the drainage tube 1. Each drainage tube 1 has such a force-bearing protrusion on its inner wall, and its position corresponds to the push protrusion on the central control rod 2.

[0064] Based on this, when the operator pushes the central control lever 2 in the first direction (far end), each of the push protrusions on the lever will move until its end face abuts and presses against the force-bearing protrusion on the inner wall of its corresponding drainage tube 1.

[0065] In this way, the thrust applied by the central control lever 2 is rigidly transmitted to each drainage tube 1, forcing all tubes to remain in a fully extended state, thus forming a rigid whole to facilitate subsequent tube placement operations.

[0066] In a preferred embodiment, the retraction structure 401 is specifically a retraction baffle disposed at the distal end of the central control lever 2. For example... Figure 6 As shown, the retraction baffle can be a straight or cross-shaped flange, and its radial dimension is larger than the inner diameter of the drainage pipe 1.

[0067] Accordingly, the driven structure 402 is specifically manifested as the tail flange located at the distal end of each of the drainage tubes 1. When the operator pulls the central control lever 2 in the second direction (proximal end), the retraction baffle at the proximal end of the lever moves backward accordingly. Since the drainage tubes 1 are stacked, the retraction baffle will first abut against the tail flange of the innermost drainage tube 1. If the operator continues to pull, the innermost drainage tube 1 will be pulled back into the inner cavity of its outermost tube.

[0068] When the operator needs to retract further, the central control lever 2 can be pulled outwards. At this time, the retraction baffle that has already abutted the innermost pipe fitting will continue to move backwards until it abuts the tail flange of the next drainage pipe fitting 1. At this point, continuing to pull the central control lever 2 will simultaneously retract both drainage pipe fittings 1.

[0069] In a preferred embodiment, the drainage structure of the drainage tube 1 is specifically defined.

[0070] Each of the drainage tubes 1 has at least one drainage port 6 on its side wall. When the inner drainage tube 1 retracts into the inner cavity of the outer drainage tube 1, the drainage port 6 of the inner drainage tube 1 corresponds to the drainage port 6 of the outer drainage tube 1, so as to connect the drainage port 6 of the outer drainage tube 1 with the inner cavity of the inner drainage tube 1.

[0071] Based on this, when the inner tube retracts, it ensures that the outer tube (e.g., tube B) can continue to perform its drainage function without being blocked from the inside by the retracted inner tube (e.g., tube A).

[0072] Furthermore, the inner drainage tube 1 (e.g., tube A) can have at least two sets of openings:

[0073] A set of distal drainage ports 6, located at its tip, are used to perform the deepest drainage task when the catheter is fully extended.

[0074] A set of proximal drainage ports 6 are located on the side wall of the tube.

[0075] When the operator pulls the central control lever 2 to retract the inner drainage tube 1 into the inner cavity of the outer drainage tube 1, firstly, the distal drainage port 6 of the inner tube is pulled into the body of the outer tube and is blocked by the wall of the outer tube, thus terminating the drainage function of the deepest part (i.e., the healed area). At the same time, the proximal drainage port 6 of the inner tube moves to a position corresponding to (i.e., aligned with) the drainage port 6 of the outer tube. At this time, the fluid from the shallower area passes through the drainage port 6 of the outer tube, flows through the proximal drainage port 6 of the aligned inner tube, and enters the central cavity of the inner drainage tube 1 as a pathway, eventually flowing out of the body.

[0076] like Figure 4 As shown, in a preferred embodiment, the drainage catheter of the present invention further includes at least one sealing structure 7.

[0077] Specifically, the sealing structure 7 is disposed between the outer wall of the inner drainage tube 1 and the inner wall of the outer drainage tube 1, and its function is to seal the annular gap between the drainage tubes 1.

[0078] Without the sealing structure 7, on the one hand, during the drainage process, the accumulated fluid may leak from the annular gap, reducing the drainage efficiency; on the other hand, and more importantly, body fluid and newly formed granulation tissue may grow into the gap.

[0079] If tissue has already grown into the gap during the retraction of the fitting, the sliding of the inner fitting will cause shearing and tearing, which will cause additional trauma and pain to the patient, contrary to the original intention of the invention.

[0080] Based on this, by setting the sealing structure 7 (e.g., an O-ring or other elastic seal), body fluids and tissues can be effectively blocked from entering the annular gap, thereby ensuring that the inner drainage tube 1 can slide smoothly and with low friction into the outer tube when retracted, improving the safety and minimally invasiveness of the step-by-step removal operation.

[0081] like Figure 5 As shown, in a preferred embodiment, the central control rod 2 is a hollow tube, the internal space of which defines a central channel 201 that extends through its length.

[0082] Furthermore, at least one opening is provided at the distal end of the central control lever 2 (i.e., the tip that extends into the body), which communicates with the central channel 201. Correspondingly, a standard interface (such as a Luer connector) is preferably provided at the proximal end (handle end) of the central control lever 2, which also communicates with the central channel 201.

[0083] One of the most common problems encountered with drainage tubes in clinical use is blockage by thick pus or blood clots. This embodiment provides a second channel independent of the main drainage channel (i.e., the inner lumen of drainage tube 1). When blockage occurs, medical staff do not need to remove the entire catheter; instead, they can directly inject saline solution under high pressure into the deepest part of the abscess cavity through this central channel 201 to dissolve the blockage and achieve in-situ clearing.

[0084] Alternatively, medical staff can use the central access point 201 to precisely deliver antibiotics, thrombolytic drugs, or anti-inflammatory drugs to the farthest part of the abscess cavity, achieving the most efficient targeted treatment.

[0085] In a preferred embodiment, the drainage catheter further includes a fixation balloon 8.

[0086] Specifically, the fixation balloon 8 is positioned at the distal end (the tip) of the central control lever 2 and surrounds the opening. The internal cavity of the fixation balloon 8 communicates with the central channel 201 via the opening.

[0087] After the catheter is inserted, the operator can inject fluid (such as saline) into the central channel 201 through the interface at the proximal end of the central control lever 2. The fluid enters and fills the fixation balloon 8 through the central channel 201 and the distal opening, causing it to inflate.

[0088] The expanded fixation balloon 8 provides a reliable anchoring effect, firmly securing the distal end of the entire catheter system inside the abscess cavity or body cavity, effectively preventing accidental displacement or dislodgement of the catheter due to patient movement or changes in body cavity pressure.

[0089] In a preferred embodiment, the central channel 201 is further divided into at least two independent sub-channels, namely a first sub-channel 2011 and a second sub-channel 2012.

[0090] Specifically, the first sub-channel 2011 is dedicated to the fixation balloon 8. It extends from the proximal end (handle end) of the central control lever 2 and communicates with the internal cavity of the fixation balloon 8 for precise inflation or deflation of the fixation balloon 8.

[0091] The second sub-channel 2012 is a completely independent fluid conduit. It also extends from the proximal handle to the distal end, and the distal end of the central control lever 2 (preferably at or near the tip of the fixed balloon 8) is provided with at least one flushing port communicating with the second sub-channel 2012.

[0092] Based on this, the operator is allowed to inflate and maintain the fixation balloon 8 in a stable anchoring state through the first sub-channel 2011. At the same time, other clinical treatment operations can be performed independently and synchronously through the second sub-channel 2012, such as repeatedly rinsing the deepest part of the abscess cavity through the irrigation port, extracting pus samples, or targeted injection of antibiotics and other drugs.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A controllable, step-by-step removal drainage catheter, characterized in that, include: At least two nested drainage tubes; A central control rod that can be axially movable and inserted inside the drainage tube; The central control rod is provided with at least one first abutting structure, and the drainage tube is provided with a corresponding second abutting structure. When the central control lever is pushed to the end position in the first direction, the first abutting structure abuts against the second abutting structure, so that at least two of the drainage tubes remain in a rigid state of mutual extension; Furthermore, the central control rod is equipped with a retractable structure, and each of the drainage pipes is equipped with a driven structure that can be driven by the retractable structure. When the central control lever is pulled in a second direction opposite to the first direction, the retraction structure sequentially drives the driven structure of the drainage tube, so that the inner drainage tube gradually retracts into the inner cavity of the outer drainage tube.

2. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, include: An external locking device is provided on the drainage tube to lock the central control lever relative to the drainage tube in multiple axial positions.

3. The controllable, step-by-step removal drainage catheter according to claim 2, characterized in that, The external locking device includes: A locking seat is fixed to the proximal end of the outermost drainage tube of the drainage tube fitting, and the locking seat has a pin hole. Locking pin; The central control lever has a plurality of axially distributed positioning holes at its proximal end. The locking pin can pass through the pin hole and be inserted into one of the plurality of positioning holes to lock the central control lever.

4. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, The first abutment structure includes at least one pusher protrusion disposed on the central control rod body and spaced apart along its axial direction; The second abutment structure includes a force-bearing protrusion disposed on the inner wall of the drainage tube and corresponding to the propulsion protrusion.

5. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, The retraction structure includes a retraction baffle disposed at the distal end of the central control lever; The driven structure includes a tail flange disposed at the distal end of the drainage pipe fitting, and the retractable baffle can abut against and drive the tail flange.

6. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, Each of the drainage tubes has at least one drainage port on its sidewall. When the inner drainage tube is retracted into the inner cavity of the outer drainage tube, the drainage port of the inner drainage tube corresponds to the drainage port of the outer drainage tube, so as to connect the drainage port of the outer drainage tube with the inner cavity of the inner drainage tube.

7. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, include: A sealing structure is provided between the outer wall of the inner drainage tube and the inner wall of the outer drainage tube, for sealing the annular gap between the drainage tubes.

8. The controllable, step-by-step removal drainage catheter according to claim 1, characterized in that, The central control lever is a hollow tube that defines a central channel; Furthermore, the distal end of the central control lever is provided with at least one opening that communicates with the central channel.

9. The controllable, step-by-step removal drainage catheter according to claim 8, characterized in that, include: A fixation balloon is positioned at the distal end of the central control rod, and the fixation balloon communicates with the opening.

10. The controllable, step-by-step removal drainage catheter according to claim 9, characterized in that, The central channel includes: The first sub-channel is connected to the fixed balloon and is used to inflate or deflate the fixed balloon. and a second sub-channel, wherein the distal end of the central control lever is provided with at least one flushing port connected to the second sub-channel.

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