Wound dilator

Abstract

The present invention discloses a wound dilator, comprising: a core tube and an expansion tube, which is sleeved outside the core tube, wherein the expansion tube has a tip section located at the distal end and M expansion sections located at the middle section and the proximal section, wherein M is an integer ≥ 2; the expansion tube also has M-1 variable-diameter transition sections, and both ends are respectively connected between two adjacent expansion sections in a smooth manner. A plurality of pull-wire members are evenly spaced and arranged on the outer wall of the core tube and are located inside the expansion tube. The arrangement of the plurality of pull-wire members can adjust the intervention direction of the wound dilator, and a variable-diameter transition section is arranged between expansion sections with different outer diameters to reduce the discontinuity of the outer surface of the expansion tube, increase the smoothness of the surface, and be more gentle during the expansion process, and not easy to cause damage to the wound.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a wound dilator. Background Art

[0002] Minimally invasive surgery, as the name implies, is surgery with minimal trauma. The advantages of minimally invasive surgery are small trauma, less pain, and quick recovery. Minimally invasive surgery usually requires a wound or vascular conduit of about 1 cm, so that minimally invasive instruments can be inserted into the target surgical site through the wound or vascular conduit. However, the surgical wound is usually very small and not enough for minimally invasive instruments to intervene, so the wound needs to be expanded.

[0003] The more common wound dilator in the prior art is composed of multiple expansion tubes with increasing outer diameters connected end to end. Since the outer diameter of each expansion tube section increases, the expansion tube with the smallest outer diameter at the distal end can be easily inserted into the wound when inserted into the wound, and the subsequent expansion tubes with increasing outer diameters can further gradually expand the wound through a retractable structure. However, since the outer diameter of each expansion tube of this dilator increases suddenly, there is no buffer. Each time a expansion tube is inserted, the wound will be torn once. Moreover, the expansion tube cannot adjust its direction, and the expansion of the wound on the rugged blood vessels is more harmful to the human body, such as the wound opened on the rugged blood vessels such as the left jugular vein. Therefore, it is necessary to improve it. Summary of the invention

[0004] The present invention aims to provide a new technical solution for a wound dilator in view of the technical problem that the outer diameter of each dilation tube of the wound dilator in the prior art changes suddenly and easily causes damage to the wound.

[0005] The wound dilator of the present invention has:

[0006] One core tube,

[0007] an expansion tube, sleeved outside the core tube, the expansion tube having a tip section at the distal end and M expansion sections at the middle section and the proximal section, wherein M is an integer ≥ 2;

[0008] The expansion tube also has an M-1 diameter-changing transition section, and both ends are connected between two adjacent expansion sections in a smooth manner.

[0009] Preferably,

[0010] The distal end of the first expansion segment is connected to the proximal end of the tip segment,

[0011] The proximal end of the i-th expansion section is connected to the distal end of the i-th diameter-reducing transition section;

[0012] The proximal end of the i-th variable diameter transition section is connected to the distal end of the i+1-th expansion section.

[0013] Where M-1≥i≥1.

[0014] Preferably,

[0015] The outer diameter D of the i+1st expansion section i+1 Greater than the outer diameter D of the i-th expansion section i , the outer diameter D1 of the first expansion section is equal to the outer diameter D0 of the proximal end of the tip section;

[0016] The outer diameter d of the distal end of the i-th variable diameter transition section i远 Equal to the outer diameter D of the i-th expansion section i ; The proximal outer diameter d of the i-th variable diameter transition section i近 Equal to the outer diameter D of the i+1th expansion section i+1 .

[0017] Preferably,

[0018] The tip section has a conical shape;

[0019] The outer diameter D of the i-th expansion section i Keep it consistent from distal to proximal;

[0020] The outer diameter d of the i-th variable diameter transition section i It gradually increases from distal to proximal.

[0021] Preferably,

[0022] The proximal section of the tip section has a proximal section tube, and the outer surface of the proximal section tube has a proximal section external thread;

[0023] The inner surface of the distal section of the first expansion section has a distal section internal thread, and the proximal section external thread of the proximal section tube is matched with the distal section internal thread to connect the tip section with the first expansion section.

[0024] Preferably,

[0025] The inner surface of the proximal section of the tip section has a proximal section internal thread;

[0026] The distal section of the first expansion section has a distal tube, the outer surface of which has a distal external thread, and the distal external thread of the distal tube is connected to the proximal internal thread, thereby connecting the tip section to the first expansion section.

[0027] Preferably,

[0028] The distal end of the core tube is located within the tip section.

[0029] Another object of the present invention is to provide another solution of a wound dilator, comprising:

[0030] A wound dilator, comprising:

[0031] One core tube,

[0032] An expansion tube, sleeved outside the core tube;

[0033] The invention is characterized by:

[0034] A plurality of pull wire members are evenly spaced apart on the outer wall of the core tube and are located inside the expansion tube. The distal ends of the plurality of pull wire members are spaced apart on the distal end of the core tube. The proximal ends of the pull wire members can be movably led out from the proximal end of the wound dilator to adjust the intervention direction of the wound dilator.

[0035] Preferably, the wound dilator further comprises:

[0036] A handle has an axial channel and a plurality of handle through-holes radially spaced apart and penetrating the axial channel. The proximal end of the Mth expansion section is connected to the distal end of the handle. The proximal end of the core tube is inserted into the axial channel of the handle. The proximal end of the pull wire member can be movably led out from the handle through-hole of the handle.

[0037] In one example, the pull wire member has:

[0038] A pull wire is located between the core tube and the expansion tube, with a distal end extending through the tube hole of the core tube into the core tube, and a proximal end extending from the axial passage of the handle to the outside of the handle through hole of the handle;

[0039] A distal wire buckle connected to the distal end of the pull wire and resting against the distal inner wall of the core tube;

[0040] A proximal wire buckle is connected to the proximal end of the pull wire and abuts against the outer side of the handle through hole of the handle.

[0041] Preferably, the wire puller also has:

[0042] A pull ring is passed through the proximal thread buckle.

[0043] In another example, the wire puller has:

[0044] A pull wire is located between the core tube and the expansion tube, with a distal end extending through the tube hole of the core tube into the core tube, and a proximal end extending from the axial passage of the handle to the inner side of the handle through hole of the handle;

[0045] A distal wire buckle connected to the distal end of the pull wire and resting against the distal inner wall of the core tube;

[0046] A pulling knob is inserted into the handle through hole of the handle and connected to the proximal end of the pulling wire. The pulling knob can be rotated to pull the pulling wire toward the proximal end.

[0047] Preferably, the pulling knob has:

[0048] A pulling column, wherein the proximal axial section has a thread hole, the proximal end of the pulling wire is connected to the thread hole, and the outer wall of the distal axial section has a pulling external thread;

[0049] A knob tube is inserted into the handle through hole of the handle. The inner cavity of the knob tube has a pulling internal thread, which is matched and connected with the pulling external thread of the pulling column. The rotation of the knob tube drives the pulling column to move toward the distal axis centerline, thereby pulling the pull wire toward the proximal end.

[0050] In one example,

[0051] The outer wall of the knob tube is provided with a limiting convex ring, and the inner wall of the handle through-hole of the handle is provided with a limiting groove, and the limiting convex ring is embedded in the limiting groove. The setting of the limiting convex ring and the limiting groove can make the knob tube rotate in place;

[0052] A pair of L-shaped guide columns are fixed on the side wall of the pulling column, and a pair of guide holes are provided at the corresponding positions of the handle. The guide columns are movably inserted into the guide holes. Due to the arrangement of the L-shaped guide columns and the guide holes, the rotational motion of the pulling column can be converted into linear motion when the knob tube is rotated.

[0053] In another example,

[0054] The outer wall of the knob tube is provided with a limiting groove, and the inner wall of the handle through-hole of the handle is provided with a limiting convex ring, and the limiting convex ring is embedded in the limiting groove. The setting of the limiting convex ring and the limiting groove can make the knob tube rotate in place;

[0055] A pair of L-shaped guide columns are fixed on the side wall of the pulling column, and a pair of guide holes are provided at the corresponding positions of the handle. The guide columns are movably inserted into the guide holes. Due to the arrangement of the L-shaped guide columns and the guide holes, the rotational motion of the pulling column can be converted into linear motion when the knob tube is rotated.

[0056] Preferably,

[0057] The wire hole is an L-shaped wire hole, having a transverse hole and a longitudinal hole connected to each other, the longitudinal hole is axially located at the axis of the pulling column, and the transverse hole is perpendicular to the longitudinal hole and extends to the outside of the side wall of the pulling column;

[0058] The proximal end of the wire pulling member is provided with a proximal wire buckle, and the proximal wire buckle is connected with the proximal end of the pull wire and abuts against the outside of the transverse hole of the L-shaped wire hole.

[0059] Preferably, the wound dilator further comprises:

[0060] A Luer connector, wherein the Luer connector has a connector inner cavity, and the connector inner cavity has internal threads;

[0061] The proximal end of the handle is provided with a handle rod, the outer surface of the handle rod is provided with external threads, and the Luer connector is threadedly connected to the handle rod at the proximal end of the handle through the matching connection between the internal threads and the external threads.

[0062] Preferably, the Luer connector has a gasket disposed in the proximal end of the stem, and the gasket can prevent bleeding.

[0063] Preferably,

[0064] The inner diameter of the joint cavity gradually decreases from the distal end to the proximal end;

[0065] The outer diameter of the handle is consistent with the distal inner diameter of the joint inner cavity, and a cross-column-shaped incision is cut axially from the middle section to the proximal section of the handle, so that the handle is inserted into the joint inner cavity and squeezed to further squeeze the gasket, further preventing bleeding.

[0066] Preferably,

[0067] A proximal limit ring is arranged on the proximal end of the outer wall of the core tube, and the proximal limit ring has a plurality of limit holes. The proximal end of the wire pulling member passes through the limit holes of the proximal limit ring in sequence.

[0068] Preferably,

[0069] A plurality of middle section limiting rings are fixed at intervals on the middle section of the outer wall of the core tube, and the middle section limiting rings also have a plurality of limiting holes. The wire pulling middle section of the wire pulling member passes through the limiting holes of the middle section limiting rings in sequence.

[0070] Preferably,

[0071] The expansion tube has a tip section located at the distal end and M expansion sections located at the middle section and the proximal section, wherein M is an integer ≥ 2;

[0072] The distal end of the first expansion segment is connected to the proximal end of the tip segment, the proximal end of the i-th expansion segment is connected to the distal end of the i+1-th expansion segment, and the proximal end of the M-th expansion segment is connected to the distal end of the handle;

[0073] The outer diameter D of the i+1st expansion section i+1 Greater than the outer diameter D of the i-th expansion sectioni , the outer diameter D1 of the first expansion segment is equal to the outer diameter D0 of the proximal end of the tip segment, where M-1≥i≥1.

[0074] Preferably, the tip section has a conical shape.

[0075] Compared with the prior art, the present invention has the following beneficial effects:

[0076] 1) The present invention reduces the discontinuity of the outer surface of the expansion tube by setting a variable diameter transition section between expansion sections with different outer diameters, so that the change of the outer diameter of the expansion section of the expansion tube is more continuous, thereby increasing the smoothness of the surface, making it more gentle during the process of dilating the wound with the expansion tube, and not easy to cause damage to the wound; the variable diameter transition section is equivalent to a lengthened design of the expansion section, which can simultaneously meet the expansion of different sizes of body surface and blood vessels, avoid multiple changes of instruments, reduce the difficulty of operation for doctors and shorten the operation time, and can adapt to different types of surgical needs. During the implantation process, the toughness of human skin and blood vessels can be considered for expansion, and the size of the human wound can be controlled to ensure that no secondary damage is caused.

[0077] 2) The present invention arranges a plurality of pull wire members between the gap between the core tube and the expansion tube, wherein the distal end of the pull wire member is fixed to the distal end of the core tube, and the proximal end of the pull wire member is arranged on the handle to pull a certain pull wire toward the proximal end, so that the core tube can be bent and the angle can be controlled to conform to the direction of more rugged blood vessels, such as the incision on the rugged blood vessels such as the left jugular vein.

[0078] 3) The tail of the controller handle is designed with a nut of variable diameter, which can play a fixing role during the guide wire delivery process; the handle can be locked with the silicone pad through the thread to further prevent bleeding

[0079] 4) The distal end of the expander is provided with a tip section, which is threadedly connected, welded, etc. with the expansion section to facilitate the installation of the direction control structure;

[0080] 5) The handle is equipped with a direction control component to facilitate the angle adjustment of the dilator tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 It is a schematic diagram of the three-dimensional structure of the wound dilator of the present invention;

[0082] Figures 2A to 2D It is a structural schematic diagram of the core tube 10 of the present invention;

[0083] Figures 3A to 3C It is a schematic structural diagram of the expansion tube 20 of the present invention;

[0084] Figures 4A to 4D It is a structural schematic diagram of the wire pulling member 30 of the present invention;

[0085] Figures 5A to 5E It is a schematic diagram of the structure of the handle 40 of the present invention;

[0086] Figure 6 Schematic diagram of the structure of the Luer connector 50 of the present invention. DETAILED DESCRIPTION

[0087] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0088] In the field of interventional medical devices, the "distal end" and "distal segment" are defined as the end away from the operator during surgery, and the "proximal end" and "proximal segment" are defined as the end close to the operator during surgery.

[0089] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the present invention, "axial" generally refers to the axial direction between the distal end and the proximal end, and of course sometimes "axial" may also refer to the axial direction of the axisymmetric element itself. "Radial" refers to the direction perpendicular to the "axial" direction.

[0091] like Figure 1 As shown, the wound dilator of the present invention comprises a core tube 10 , a dilation tube 20 , a pull wire 30 , a handle 40 and a Luer connector 50 .

[0092] like Figures 2A to 2DAs shown, in this example, the core tube 10 is a hollow thin round tube, and the inside can be used for a guide wire. The core tube 10 is inserted into the expansion tube 20, and the distal end directly reaches the inside of the tip section 21 at the distal end of the expansion tube 20, and the proximal end directly reaches the axial channel 41 inside the handle 40. A plurality of middle section limiting rings (not shown) and a proximal limit ring 11 are fixed at intervals on the outer wall of the core tube 10, and the proximal limit ring 11 corresponds to the position of the handle perforation 42 of the handle 40, and the middle section limiting ring and the proximal limit ring 11 have a plurality of limiting holes. The pull wire of the wire pull member 30 is arranged on the outside of the core tube 10, and passes through the limiting holes of the middle section limiting ring and the proximal limit ring 11 in turn, providing relative support for the wire pull member 30. The distal end of the core tube 10 has a plurality of tube holes, such as 4 tube holes, for the distal end of the pull wire of the external wire pull member 30 to pass through and enter the inside of the core tube 10.

[0093] like Figures 3A to 3C As shown, in this example, the expansion tube 20 is sleeved outside the core tube 10, and the pull wire member 30 is located in the space between the core tube 10 and the expansion tube 20. The proximal end of the expansion tube 20 is connected to the distal end of the handle 40. The expansion tube 20 is composed of multiple sections, including a tip section 21 located at the distal end, M expansion sections 22 and M-1 variable diameter transition sections 23 located in the middle and proximal sections, where M is an integer ≥ 2, and the length exposed in the handle 40 is about 300mm to 500mm in total length. The outer wall of the expansion tube 20 may be provided with a hydrophilic coating, and may be partially provided with a developing identification member or at least partially made of a developable material. The tip section 21 is conical in shape, hollow inside, and can be passed through by a guide wire, with a length of about 20 to 60mm. The distal end of the core tube 10 may be arranged in the hollow interior of the tip section 21. In one example, the proximal section of the tip section 21 has a proximal section tube 211, and the outer surface of the proximal section tube 211 has a proximal section external thread; the inner surface of the distal section of the first expansion section 22 has a distal section internal thread, and the proximal section external thread of the proximal section tube 211 is matched with the distal section internal thread, thereby connecting the tip section 21 to the first expansion section 22. In another example not shown in the figure, the proximal section inner surface of the tip section 21 has a proximal section internal thread; the distal section of the first expansion section 22 has a distal section tube, and the outer surface of the distal section tube has a distal section external thread, and the distal section external thread of the distal section tube is matched with the proximal section internal thread, thereby threading the tip section 21 to the first expansion section 22 together.

[0094] In one example, two expansion segments 22 with similar outer diameters are connected to each other. The expansion segments 22 are cylindrical in shape and have a length of about 50 to 120 mm. For example, from the distal end to the proximal end, the outer diameter of each expansion segment 22 gradually increases. For example, the outer diameter of the first expansion segment is F16, the outer diameter of the second expansion segment is F18, and the outer diameter of the third expansion segment is F20. For each section toward the proximal end, the outer diameter of the expansion segment 22 increases by 2 units, so that the outer surface of the expander is smooth enough to minimize the damage to the expanded tissue surface. Until the proximal end of the last expansion segment 22 is connected to the handle 40, such as a fixed connection. Thus, the final expansion tube 20 is formed. In this example, the distal end of the first expansion segment 22 is connected to the proximal end of the tip segment 21, the proximal end of the first expansion segment is connected to the distal end of the second expansion segment, and the proximal end of the second expansion segment is connected to the distal end of the third expansion segment. That is, the proximal end of the i-th expansion segment is connected to the distal end of the i+1-th expansion segment, M-1≥i≥1, and so on until the proximal end of the last expansion segment 22 is connected to the distal end of the handle 40. In this way, the final expansion tube 20 is formed. At this time, the outer diameter D2 of the second expansion segment is greater than the outer diameter D1 of the first expansion segment; the outer diameter D3 of the third expansion segment is greater than the outer diameter D2 of the second expansion segment, and so on, each incremental increase is increased by 2 units of the outer diameter of each segment, until the proximal end of the last expansion segment is connected to the distal end of the handle 40. The wound is gradually expanded step by step by increasing the outer diameter.

[0095] In the above example, since the outer diameter D of the i-th expansion section iIt is always consistent from the distal end to the proximal end, and the outer diameter of the adjacent next expansion section 22 increases in a jumpy manner at the connection point. This will still cause certain damage to the wound during the expansion process. Therefore, this example provides another solution, in which a variable diameter transition section 23 is set between two adjacent expansion sections 22, with a length of about 1 to 20 mm. The two ends are connected between the two adjacent expansion sections 22 in a smooth manner. The variable diameter transition section 23 can make the outer diameter change of the expansion tube 20 more gentle, further reducing the damage caused to the wound. That is, the distal end of the first expansion section 22 is connected to the proximal end of the tip section 21, the proximal end of the first expansion section is connected to the distal end of the first variable diameter transition section, and the proximal end of the first variable diameter transition section is connected to the distal end of the second expansion section. The proximal end of the second expansion section is connected to the distal end of the second variable diameter transition section, and the proximal end of the second variable diameter transition section is connected to the distal end of the third expansion section. This cycle continues, that is, the proximal end of the i-th expansion section is connected to the distal end of the i-th variable diameter transition section, the proximal end of the i-th variable diameter transition section is connected to the distal end of the i+1-th expansion section, M-1≥i≥1, and so on until the proximal end of the last expansion section 22 is connected to the distal end of the handle 40. In this way, the final expansion tube 20 is formed. At this time, the outer diameter D2 of the second expansion section is greater than the outer diameter D1 of the first expansion section, and the outer diameter D1 of the first expansion section is equal to the outer diameter D0 of the proximal end of the tip section; the distal outer diameter d of the first variable diameter transition section is 1远 Equal to the outer diameter D1 of the first expansion section; the proximal outer diameter d of the first variable diameter transition section 1近 is equal to the outer diameter D2 of the second expansion section. That is, the outer diameter D of the i+1th expansion section i+1 Greater than the outer diameter D of the i-th expansion section i ; The outer diameter d of the distal end of the i-th variable diameter transition section i远 Equal to the outer diameter D of the i-th expansion section i ; The proximal outer diameter d of the i-th variable diameter transition section i近 Equal to the outer diameter D of the i+1th expansion section i+1 In this case, the two adjacent expansion sections 22 achieve a smooth transition of the outer diameters through the variable diameter transition section 23, instead of directly increasing the outer diameter in a jump-like manner and causing damage to the wound as in the prior art. i It remains consistent from the distal end to the proximal end; and the outer diameter d of the i-th variable diameter transition section i It gradually increases from the distal end to the proximal end.

[0096] like Figures 4A to 4DAs shown, in this example, there are several wire pullers 30, 4 in the figure, which are evenly distributed on the outer wall of the core tube 10 and keep the same direction as the core tube 10. The wire pullers 30 are also located in the expansion tube 20. The distal ends of the wire pullers 30 are spaced apart on the distal end of the core tube 20, and the proximal ends of the wire pullers 30 can be movably led out from the proximal end of the wound dilator to adjust the intervention direction of the wound dilator.

[0097] In one example, the pull wire member 30 has a pull wire 31, which is located between the core tube 10 and the expansion tube 20, with the distal end extending into the core tube 10 through the tube hole of the core tube 10, and the proximal end extending from the axial channel 41 of the handle 40 to the outside of the handle through hole 42 of the handle 40. The middle section of the pull wire 31 passes through the limiting hole of the middle section limiting ring (not shown) on the outside of the core tube 10 to roughly limit the pull wire 31. The distal end of the pull wire member 30 has a distal wire buckle 32, which is connected to the distal end of the pull wire 31, and the distal wire buckle 32 abuts against the distal inner wall of the core tube 10, so that the distal end of the pull wire 31 will not fall off from the tube hole at the distal end of the core tube 10. The proximal end of the pull wire 31 passes through the limiting hole of the proximal limiting ring 11, and the proximal end of the pull wire member 30 has a proximal wire buckle 33 connected to the proximal end of the pull wire 31. The proximal wire buckle 33 abuts against the outside of the handle through hole 42 of the handle 40, so that the proximal end of the pull wire 31 will not be retracted into the handle 40. In a further preferred example, the pull wire member 30 has a pull ring 34, which is passed through the proximal wire buckle 33, so that when the pull wire 31 is pulled, it is more convenient to extract the proximal wire buckle 33.

[0098] In another example, the pull wire member 30 has a pull wire 31, which is located between the core tube 10 and the expansion tube 20, with the distal end extending into the core tube 10 through the tube hole of the core tube 10, and the proximal end extending from the axial channel 41 of the handle 40 to the inner side of the handle through hole 42 of the handle 40. The middle section of the pull wire 31 passes through the limiting hole of the middle section limiting ring (not shown) on the outside of the core tube 10 to roughly limit the pull wire 31. The distal end of the pull wire member 30 has a distal wire buckle 32, which is connected to the distal end of the pull wire 31, and the distal wire buckle 32 abuts against the distal inner wall of the core tube 10, so that the distal end of the pull wire 31 will not fall off from the tube hole at the distal end of the core tube 10. The proximal end of the pull wire 31 passes through the limiting hole of the proximal limiting ring 11. The wire pulling member 30 has a pulling knob 36 which is inserted into the handle through hole 42 of the handle 40 . The pulling knob 36 is connected to the proximal end of the pulling wire 31 . The pulling knob 36 can be rotated to pull the pulling wire 31 toward the proximal end.

[0099] The pulling knob 36 comprises a pulling column 361 and a knob tube 362. The pulling column 361 has a wire hole 363 in the proximal axis section, the proximal end of the pulling wire 31 is connected to the wire hole 363, and the outer wall of the distal axis section has a pulling external thread; the knob tube 362 is inserted into the handle through hole 42 of the handle 40, and the inner cavity of the knob tube 362 has a pulling internal thread, which is matched and connected with the pulling external thread of the pulling column 361, and the rotation of the knob tube 362 drives the pulling column 361 to move toward the distal axis direction, thereby pulling the pulling wire 31 toward the proximal end. In one example, the outer wall of the knob tube 362 is provided with a limiting groove 364, and the inner wall of the handle through hole 42 of the handle 40 is provided with a limiting convex ring (not shown in the figure), which is embedded in the limiting groove 364. The setting of the limiting convex ring and the limiting groove can make the knob tube 362 rotate in situ; a pair of L-shaped guide columns 365 are fixed on the side wall of the pulling column 361, and a pair of guide holes (not shown in the figure) are provided at the corresponding position of the handle 40. The guide columns 365 are movably penetrated in the guide holes. By the setting of the L-shaped guide columns and the guide holes, when the knob tube 362 is rotated, the rotational motion of the pulling column 361 can be converted into linear motion. The linear hole 363 is L-shaped, with a transverse hole and a longitudinal hole interconnected with each other, the longitudinal hole is axially located at the axis of the pulling column 361, and the transverse hole is perpendicular to the longitudinal hole and extends to the outside of the side wall of the pulling column 361. The proximal end of the wire pulling member 30 has a proximal wire buckle 33 , which is connected to the proximal end of the pulling wire 31 and abuts against the outside of the transverse hole of the L-shaped wire hole 363 .

[0100] In another example, the outer wall of the knob tube 362 has a limiting convex ring, and the inner wall of the handle through hole 42 of the handle 40 has a limiting groove, and the limiting convex ring is embedded in the limiting groove. The setting of the limiting convex ring and the limiting groove can make the knob tube rotate in place. A pair of L-shaped guide columns are fixed on the side wall of the pulling column 361, and a pair of guide holes are provided at the corresponding position of the handle 40. The guide columns are movably penetrated in the guide holes. Due to the setting of the L-shaped guide columns and the guide holes, when the knob tube 362 is rotated, the rotational motion of the pulling column 361 can be converted into linear motion.

[0101] like Figures 5A to 5EAs shown, in this example, the handle 40 has an axial channel 41 and a plurality of handle through-holes 42 radially spaced and intersecting the axial channel 41, and there are four handle through-holes in the figure. The proximal end of the Mth expansion section 22 is connected to the distal end of the handle 40, and the proximal end of the core tube 10 is inserted into the axial channel 41 of the handle 40. The proximal end of the wire puller 30 can be movably led out from the handle through-hole 42 of the handle 40. As mentioned above, in one example, the proximal end wire buckle 33 abuts against the outside of the handle through-hole 42 of the handle 40, so that the proximal end of the wire puller 31 will not be retracted into the handle 40. At the same time, the pull ring 34 is inserted into the proximal end wire buckle 33 and is located outside the handle through-hole 42, so that the wire puller 30 can be easily pulled out. In another example, the pulling knob 36 is rotatably embedded in the handle through hole 42 of the handle 40. The inner wall of the handle through hole 42 of the handle 40 has a limiting convex ring, which is embedded in the limiting groove 364 on the outer wall of the knob tube 362. Through the limiting setting, when the knob tube 362 is twisted, it can only rotate but cannot be pulled out. The handle 40 also has a pair of guide holes (not shown) on both sides symmetrical to the handle through hole 42. Since the guide column 365 on the side wall of the pulling column 361 is penetrated in the guide hole, when the pulling column 361 is rotated by the knob tube 362, it does not rotate itself, but can only be moved linearly away from the axis end, so that the pull wire 31 connected to the pulling column 361 can be pulled toward the proximal end, thereby achieving the purpose of adjusting the forward direction of the wound dilator. The proximal end of the handle 40 has a handle rod 44, and the outer surface of the handle rod 44 has an external thread for connecting the Luer connector 50.

[0102] like Figure 6 As shown, in this example, the distal end of the Luer connector 50 is connected to the proximal end of the handle 40, and the proximal end of the Luer connector 50 can be used to connect other instruments. The Luer connector 50 has a connector inner cavity 51, and the connector inner cavity 51 has an internal thread. The Luer connector 50 is threadedly connected to the handle 44 at the proximal end of the handle 40 through the internal thread and the external thread of the handle 44 of the handle 40. The Luer connector 50 has a gasket (not shown in the figure), which is arranged in the proximal end of the handle 44, and the setting of the gasket can prevent bleeding. In a further preferred example, the inner diameter of the connector inner cavity 51 gradually decreases from the distal end to the proximal end. The outer diameter of the handle 44 is consistent with the distal inner diameter of the connector inner cavity 51, and a cross-column-shaped incision is cut from the middle section to the proximal section of the handle 44 in the axial direction, so that the handle 44 is inserted into the connector inner cavity 51 and squeezed, thereby further squeezing the gasket, further preventing bleeding.

[0103] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A wound dilator, Features have: One core tube, an expansion tube, sleeved outside the core tube, the expansion tube having a tip section at the distal end and M expansion sections at the middle section and the proximal section, wherein M is an integer ≥ 2; A plurality of wire pullers are evenly spaced on the outer wall of the core tube and located in the expansion tube, the distal ends of the plurality of wire pullers are spaced on the distal end of the core tube, and the proximal ends of the wire pullers can be movably led out from the proximal end of the wound dilator; The expansion tube also has an M-1 diameter-changing transition section, and both ends are connected between two adjacent expansion sections in a smooth manner; The distal end of the first expansion segment is connected to the proximal end of the tip segment; The proximal end of the i-th expansion section is connected to the distal end of the i-th diameter-reducing transition section; The proximal end of the i-th variable diameter transition section is connected to the distal end of the i+1-th expansion section; Where M-1≥i≥1; The outer diameter D of the i+1st expansion section i+1 Greater than the outer diameter D of the i-th expansion section i , the outer diameter D of the first expansion section 1 Equal to the outer diameter D of the proximal end of the tip segment 0 ; The outer diameter d of the distal end of the i-th variable diameter transition section i远 Equal to the outer diameter D of the i-th expansion section i ; The proximal outer diameter d of the i-th variable diameter transition section i近 Equal to the outer diameter D of the i+1th expansion section i+1 ; The tip section has a conical shape; The outer diameter D of the i-th expansion section i Keep it consistent from distal to proximal; The outer diameter d of the i-th variable diameter transition section i Gradually enlarges from distal to proximal end; The proximal section of the tip section has a proximal section tube, and the outer surface of the proximal section tube has a proximal section external thread; the inner surface of the distal section of the first expansion section has a distal section internal thread, and the proximal section external thread of the proximal section tube is matched and connected with the distal section internal thread, so as to connect the tip section with the first expansion section; or, The inner surface of the proximal section of the tip section has a proximal section internal thread; the distal section of the first expansion section has a distal section tube, and the outer surface of the distal section tube has a distal section external thread, and the distal section external thread of the distal section tube is connected to the proximal section internal thread, thereby connecting the tip section to the first expansion section.

2. The wound dilator according to claim 1, Features The distal end of the core tube is located within the tip section.

3. The wound dilator according to claim 1, Features The wound dilator also has: A handle has an axial channel and a plurality of handle through-holes radially spaced apart and penetrating the axial channel. The proximal end of the Mth expansion section is connected to the distal end of the handle. The proximal end of the core tube is inserted into the axial channel of the handle. The proximal end of the pull wire member can be movably led out from the handle through-hole of the handle.

4. The wound dilator according to claim 3, Features The wire puller has: A pull wire is located between the core tube and the expansion tube, with a distal end extending through the tube hole of the core tube into the core tube, and a proximal end extending from the axial passage of the handle to the outside of the handle through hole of the handle; A distal wire buckle connected to the distal end of the pull wire and resting against the distal inner wall of the core tube; A proximal wire buckle is connected to the proximal end of the pull wire and abuts against the outer side of the handle through hole of the handle.

5. The wound dilator according to claim 4, Features The wire puller also has: A pull ring is passed through the proximal thread buckle.

6. The wound dilator according to claim 3, Features The wire puller has: A pull wire is located between the core tube and the expansion tube, with a distal end extending through the tube hole of the core tube into the core tube, and a proximal end extending from the axial passage of the handle to the inner side of the handle through hole of the handle; A distal wire buckle connected to the distal end of the pull wire and resting against the distal inner wall of the core tube; A pulling knob is inserted into the handle through hole of the handle and connected with the proximal end of the pulling wire.

7. The wound dilator according to claim 6, Features The pulling knob has: A pulling column, wherein the proximal axial section has a thread hole, the proximal end of the pulling wire is connected to the thread hole, and the outer wall of the distal axial section has a pulling external thread; A knob tube is inserted into the handle through hole of the handle, and the inner cavity of the knob tube has a pulling internal thread, which is matched and connected with the pulling external thread of the pulling column.

8. The wound dilator according to claim 7, Features: The outer wall of the knob tube is provided with a limiting convex ring, the inner wall of the handle through-hole of the handle is provided with a limiting groove, and the limiting convex ring is embedded in the limiting groove; A pair of L-shaped guide columns are fixed on the side walls of the pulling column, and a pair of guide holes are provided at corresponding positions of the handle, and the guide columns are movably inserted into the guide holes.

9. The wound dilator according to claim 7, Features: The outer wall of the knob tube is provided with a limiting groove, and the inner wall of the handle through-hole of the handle is provided with a limiting convex ring, and the limiting convex ring is embedded in the limiting groove; A pair of L-shaped guide columns are fixed on the side walls of the pulling column, and a pair of guide holes are provided at corresponding positions of the handle, and the guide columns are movably inserted into the guide holes.

10. The wound dilator according to claim 7, Features The wire hole is an L-shaped wire hole, having a transverse hole and a longitudinal hole connected to each other, the longitudinal hole is axially located at the axis of the pulling column, and the transverse hole is perpendicular to the longitudinal hole and extends to the outside of the side wall of the pulling column; The proximal end of the wire pulling member is provided with a proximal wire buckle, and the proximal wire buckle is connected with the proximal end of the pull wire and abuts against the outside of the transverse hole of the L-shaped wire hole.

11. The wound dilator according to claim 3, Features The wound dilator also has: A Luer connector, wherein the Luer connector has a connector inner cavity, and the connector inner cavity has internal threads; The proximal end of the handle is provided with a handle rod, the outer surface of the handle rod is provided with external threads, and the Luer connector is threadedly connected to the handle rod at the proximal end of the handle through the matching connection between the internal threads and the external threads.

12. The wound dilator according to claim 11, Features The Luer connector has a washer disposed within the proximal end of the stem.

13. The wound dilator according to claim 12, Features The inner diameter of the joint cavity gradually decreases from the distal end to the proximal end; The outer diameter of the handle is consistent with the inner diameter of the distal end of the joint inner cavity, and a cross-column-shaped incision is cut in the axial direction from the middle section to the proximal section of the handle.

14. The wound dilator according to claim 1, Features A proximal limit ring is arranged on the proximal end of the outer wall of the core tube, and the proximal limit ring has a plurality of limit holes. The proximal end of the wire pulling member passes through the limit holes of the proximal limit ring in sequence.

15. The wound dilator according to claim 14, Features A plurality of middle section limiting rings are fixed at intervals on the middle section of the outer wall of the core tube, and the middle section limiting rings also have a plurality of limiting holes. The wire pulling middle section of the wire pulling member passes through the limiting holes of the middle section limiting rings in sequence.

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