Coaxial sealing device for puncture surgery

Abstract

Provided is a coaxial sealing device for puncture surgery, comprising: a sheath tube structure (3), a pointed needle core (11), and a rounded needle core (21). The sheath tube structure (3) comprises a sheath tube seat assembly (32) and a sheath tube body (31). The sheath tube seat assembly (32) comprises a sheath tube seat upper cover (321), a sheath tube seat base (324), and a sheath tube portion sealing member (323). The sheath tube seat upper cover (321) is provided with an upper cover portion groove (3211). The upper cover portion groove (3211) is provided with an axial protruding member (3212), the axial protruding member (3212) being provided with an axial through-hole (3213). The sheath tube seat base (324) is provided with a base portion groove (3243). The sheath tube seat base (324) is mounted in the upper cover portion groove (3211). The sheath tube seat base (324) is provided with a connection head (3244). The sheath tube portion sealing member (323) is disposed in the base portion groove (3243). The rounded needle core (21) is capable of passing through the axial through-hole (3213), the sheath tube portion sealing member (323), a sheath tube connection channel (3241), and a sheath tube axial channel (313) in sequence. The pointed needle core (11) is capable of passing through the axial through-hole (3213), the sheath tube portion sealing member (323), the sheath tube connection channel (3241), and the sheath tube axial channel (313) in sequence. The coaxial sealing device can not only seal a surgical channel but also ensure smooth operation of surgical instruments, while enabling localized surgical treatment when necessary.

Description

Coaxial sealing device for puncture surgery Technical Field

[0001] The present invention relates to the technical field of puncture devices, and in particular to a coaxial sealing device used in puncture surgery. Background Art

[0002] In percutaneous puncture surgery, there are often a series of surgical operations such as percutaneous puncture, biopsy tissue collection, ablation surgery, drainage and injection. The existing coaxial needle includes a sheath and a needle core that can be inserted into the sheath. In traditional surgical procedures, the needle core of the coaxial needle is usually used to pierce the patient's skin to reach the predetermined target position, and then the needle core is removed to retain the sheath as a surgical channel on the patient. The doctor uses a biopsy needle or biopsy gun with the help of the surgical channel formed by the sheath to take tissue samples, perform ablation treatment surgery, and drain bleeding when necessary. The surgical channel formed by a common sheath is usually designed as a metal rigid structure, and in order to ensure the smooth passage of other surgical instruments in the surgical channel, the outer diameter of the surgical instrument is slightly smaller than the inner diameter of the surgical channel, so there will be a gap between the surgical instrument and the surgical channel. However, in actual percutaneous surgery, as the operation time increases, especially in lung puncture surgery, the probability of patients developing pneumothorax or bleeding greatly increases.

[0003] How to design a device that can not only seal the surgical channel but also ensure smooth use of surgical instruments and perform local surgical treatment such as drainage or injection when necessary is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a coaxial sealing device for puncture surgery that can not only seal the surgical channel, but also ensure the smooth use of surgical instruments and perform local surgical treatment such as drainage or injection when necessary, so as to solve the above-mentioned problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a coaxial sealing device for puncture surgery, comprising: a sheath structure, a pointed needle core and a rounded needle core;

[0006] The top of the sheath tube seat base is provided with a base groove, and the bottom surface of the sheath tube seat base is provided with a sheath tube connection channel, and the sheath tube connection channel is communicated with the base groove; the top of the sheath tube seat base is installed in the groove of the upper cover portion; the outer surface of the bottom of the sheath tube seat base is provided with a connecting head, and the connecting head is provided with a drainage channel, and the drainage channel is communicated with the sheath tube connection channel; the sheath tube seal is arranged in the base groove, and the sheath tube seal is located between the axial protrusion and the bottom surface of the groove of the base groove; the sheath tube body is connected to the sheath tube connection channel, and the sheath tube body has a sheath axial channel, and the outer surface of the lower end of the sheath tube body is provided with a tube wall through hole;

[0007] A needle core sealing portion is provided at the lower portion of the round-headed needle core; the round-headed needle core can sequentially pass through the axial through hole, the sheath tube sealing member, the sheath tube connecting channel, and the sheath tube axial channel, and the needle core sealing portion can be stuck in the sheath tube axial channel; the sheath tube sealing member can cover the outer circumferential surface of the round-headed needle core;

[0008] The pointed needle core may sequentially pass through the axial through hole, the sheath tube seal, the sheath tube connecting channel, and the sheath tube axial channel, and the sheath tube seal may cover the outer circumferential surface of the pointed needle core.

[0009] Preferably, the sheath tube seal is a circular ring structure with a central circular hole, and the sheath tube seal is made of elastic material; when the sheath tube seal is subjected to the extrusion force applied by the axial protrusion, the diameter of the central circular hole of the sheath tube seal is reduced.

[0010] Furthermore, an internal thread of the upper cover is provided in the groove of the upper cover, and an external thread of the base is provided on the outer surface of the top of the sheath tube seat base, and the internal thread of the upper cover can be connected to the external thread of the base.

[0011] Furthermore, the sheath structure further includes a gasket, which is arranged between the axial protrusion and the sheath seal.

[0012] Preferably, the top of the sheath tube seat base is inserted into the groove of the upper cover; a cross-cut portion is provided in the middle of the sheath tube seal; when the sheath tube seat upper cover moves downward, the axial protrusion pushes the sheath tube seal, and the sealing portion channel formed by the cross-cut portion opens; when the sheath tube seat upper cover moves upward, the axial protrusion moves away from the sheath tube seal, and the sealing portion channel formed by the cross-cut portion closes.

[0013] Preferably, the upper end of the pointed needle core is connected to the pointed needle seat, and the upper end of the round needle core is connected to the round needle seat; the pointed needle seat can be connected to the sheath seat upper cover, and the round needle seat can be connected to the sheath seat upper cover.

[0014] Preferably, the connector is connected to the valve via a drainage tube.

[0015] Preferably, the round-headed needle core includes a round-headed needle body and a needle core head connected to the lower end of the round-headed needle body, the diameter of the needle core head is larger than the diameter of the round-headed needle body; the needle core head is the needle core sealing part.

[0016] Preferably, a head groove is provided on the outer side surface of the lower part of the round-head needle core, and the needle core sealing part is a sealing ring, which is sleeved on the head groove.

[0017] Preferably, the sheath structure further includes a positioning ring; the positioning ring is sleeved on the sheath body.

[0018] The coaxial sealing device for puncture surgery of the present invention has the following beneficial effects:

[0019] When the coaxial sealing device for puncture surgery of the present invention is used, the pointed needle core and the round needle core are not used at the same time, and the pointed needle core and the round needle core are respectively used in conjunction with the sheath structure at different stages of the operation; when the pointed needle core penetrates into the sheath structure, the coaxial sealing device has a puncture function; when the round needle core penetrates into the sheath structure, the sheath seal can cover the outer circumferential surface of the pointed needle core, and the needle core sealing part can be stuck in the axial channel of the sheath, so that the two ends of the sheath structure can be sealed. The through hole in the tube wall of the sheath structure makes the interior of the sheath structure communicate with the exterior of the sheath structure, and the two ends of the drainage channel are respectively connected with the sheath axial channel and the sheath connecting channel. By connecting the suction device through the connector, the coaxial sealing device can have the function of draining liquid; by connecting the pushing device through the connector, the coaxial sealing device can have the injection function; the present invention is a coaxial sealing device that can not only seal the surgical channel, but also ensure the smooth use of surgical instruments, and can perform local surgical treatment such as drainage or injection when necessary. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of the coaxial sealing device for puncture surgery according to Example 1 in an unassembled state.

[0021] FIG2 is a schematic structural diagram of a pointed needle assembly of a coaxial sealing device for puncture surgery according to Example 1. FIG.

[0022] FIG3 is a schematic structural diagram of a round-tip needle assembly of a coaxial sealing device for puncture surgery according to Example 1. FIG.

[0023] FIG4 is a schematic structural diagram showing the lower portion of the round-tip needle assembly of the coaxial sealing device for puncture surgery according to Example 1. FIG.

[0024] FIG5 is a schematic structural diagram showing the lower portion of the round-tip needle assembly of the coaxial sealing device for puncture surgery according to Example 1 when no sealing ring is installed.

[0025] FIG6 is a schematic structural diagram showing a sheath tube seat base of a coaxial sealing device for puncture surgery according to Example 1 when no base scale portion is provided on the sheath tube seat base.

[0026] FIG. 7 is a schematic diagram showing an enlarged structure of point A in FIG. 6 .

[0027] FIG8 is a schematic structural diagram showing a sheath tube seat base of a coaxial sealing device for puncture surgery according to Example 1 when a base scale portion is provided on the sheath tube seat base.

[0028] FIG9 is a schematic diagram showing an enlarged structure of point B in FIG8 .

[0029] FIG10 is a schematic structural diagram showing the sheath seat assembly of the coaxial sealing device for puncture surgery according to Example 1 in a disassembled state, with no base scale portion provided on the sheath seat base.

[0030] FIG11 is a schematic structural diagram showing the sheath seat assembly of the coaxial sealing device for puncture surgery according to Example 1 in a disassembled state, with a base scale portion provided on the sheath seat base.

[0031] FIG12 is a schematic structural diagram of the sheath seat assembly of the coaxial sealing device for puncture surgery according to Example 1. FIG.

[0032] FIG13 is a schematic diagram showing the internal structure of the sheath seat assembly of the coaxial sealing device for puncture surgery according to Example 1. FIG.

[0033] FIG14 is a schematic diagram showing the internal structure of the coaxial sealing device for puncture surgery according to Example 1, in which a pointed needle core is inserted into the sheath seat assembly and the sheath seal does not undergo elastic deformation.

[0034] FIG15 is a schematic diagram showing the internal structure of the coaxial sealing device for puncture surgery according to Example 1, in which a pointed needle core is inserted into the sheath seat assembly and the sheath seal undergoes elastic deformation.

[0035] FIG16 is a schematic diagram showing the internal structure of the coaxial sealing device for puncture surgery according to Example 1 when the coaxial sealing device is in a sealed state and a negative pressure operation is performed on the fluid in the coaxial sealing device.

[0036] FIG17 is a schematic diagram showing the internal structure of the coaxial sealing device for puncture surgery according to Example 1 when the coaxial sealing device is in a sealed state and a positive pressure operation is performed on the fluid in the coaxial sealing device.

[0037] FIG18 is a schematic structural diagram showing the coaxial sealing device for puncture surgery according to Example 1 when it is in a sealed state and performing a suction operation.

[0038] FIG19 is a schematic structural diagram showing the coaxial sealing device for puncture surgery according to Example 1 when it is in a sealed state and performing an injection operation.

[0039] FIG20 is a schematic structural diagram showing the sheath seat base and the sheath seat upper cover of the coaxial sealing device for puncture surgery according to Example 2 when they are connected.

[0040] FIG21 is a schematic structural diagram showing a coaxial sealing device for puncture surgery according to Example 3 when no gasket is provided.

[0041] FIG22 is a schematic structural diagram showing a coaxial sealing device for puncture surgery according to Example 4 in which no head groove is provided on the needle core head.

[0042] DESCRIPTION OF REFERENCE NUMERALS 1 Pointed needle assembly 11 Pointed needle core 12 Pointed needle seat 2 Round needle assembly 21 Round needle core 211 Needle core head 2111 Head groove 212 Round needle body 22 Round needle seat 23 Sealing ring 3 Sheath structure 31 Sheath body 311 Tube wall through hole 312 Sheath scale portion 313 Sheath axial channel 32 Sheath seat assembly 321 Sheath seat upper cover 3211 Upper cover groove 3212 Axial protrusion 3213 Axial through hole 3214 Upper cover internal thread 3215 Upper cover groove flange 3216 Lower edge of sheath seat upper cover 322 Gasket 323 Sheath seal 3231 Cross-cut portion 324 Sheath seat base 3241 Sheath connecting channel 3242 Drainage channel 3243 Base groove 3244 Connector 3245 Base external thread 3246 Base raised portion 3247Base scale 33 Drainage tube 34 Valve 341 Luer port of three-way valve 35 Positioning ring DETAILED DESCRIPTION

[0043] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0044] Please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0045] Example 1

[0046] As shown in FIG1 to FIG19 , the coaxial sealing device for puncture surgery of this embodiment includes: a sheath structure 3, a pointed needle assembly 1 and a rounded needle assembly 2;

[0047] The sheath tube structure 3 includes a sheath tube seat assembly 32 and a sheath tube body 31. The sheath tube seat assembly 32 includes a sheath tube seat upper cover 321, a sheath tube seat base 324 and a sheath tube seal 323. The bottom surface of the sheath tube seat upper cover 321 is provided with an upper cover groove 3211, an axial protrusion 3212 is provided in the upper cover groove 3211, and an axial through hole 3213 is provided on the axial protrusion 3212; the top surface of the sheath tube seat base 324 is provided with a base groove 3243, and the bottom surface of the sheath tube seat base 324 is provided with a sheath tube connecting channel 3241, which is connected to the base groove 3243; the sheath tube seat base 32 4 is installed in the groove 3211 of the upper cover; a connector 3244 is provided on the outer side of the bottom of the sheath seat base 324, and a drainage channel 3242 is provided on the connector 3244, and the drainage channel 3242 is connected to the sheath connection channel 3241; the sheath seal 323 is set in the base groove 3243, and the sheath seal 323 is located between the axial protrusion 3212 and the bottom surface of the base groove 3243; the sheath body 31 is connected to the sheath connection channel 3241, and the sheath body 31 has a sheath axial channel 313, and a tube wall through hole 311 is provided on the outer side of the lower end of the sheath body 31;

[0048] The pointed needle assembly 1 includes a pointed needle core 11 and a pointed needle seat 12 connected to the upper end of the pointed needle core 11; the round needle assembly 2 includes a round needle core 21 and a round needle seat 22 connected to the upper end of the round needle core 21; the pointed needle seat 12 can be connected to the sheath seat upper cover 321, and the round needle seat 22 can be connected to the sheath seat upper cover 321.

[0049] A needle core sealing portion is provided at the lower portion of the round needle core 21; the round needle core 21 can sequentially pass through the axial through hole 3213, the sheath tube sealing member 323, the sheath tube connecting channel 3241, and the sheath tube axial channel 313, and the needle core sealing portion can be stuck in the sheath tube axial channel 313; the sheath tube sealing member 323 can cover the outer circumference of the round needle core 21;

[0050] The pointed needle core 11 may sequentially pass through the axial through hole 3213 , the sheath tube seal 323 , the sheath tube connecting channel 3241 and the sheath tube axial channel 313 , and the sheath tube seal 323 may cover the outer circumference of the pointed needle core 11 .

[0051] When the coaxial sealing device for puncture surgery of the present invention is used, the pointed needle core 11 and the round needle core 21 are not used at the same time. The pointed needle core 11 and the round needle core 21 are respectively used in conjunction with the sheath structure 3 at different stages of the operation; when the pointed needle core 11 penetrates into the sheath structure 3, the coaxial sealing device has a puncture function; when the round needle core 21 penetrates into the sheath structure 3, the sheath seal 323 can cover the outer peripheral surface of the pointed needle core 11, and the needle core sealing part can be stuck in the axial channel 313 of the sheath, so that the two ends of the sheath structure 3 can be sealed; the through hole 31 of the tube wall of the sheath structure 3 1, so that the interior of the sheath structure 3 is connected with the exterior of the sheath structure 3, and the two ends of the drainage channel 3242 are respectively connected with the sheath axial channel 313 and the sheath connecting channel 3241, and the suction device is connected through the connector 3244, so that the coaxial sealing device can have the function of draining liquid, and the pushing device is connected through the connector 3244, so that the coaxial sealing device can have the injection function; the present invention is a coaxial sealing device that can not only seal the surgical channel, but also ensure the smooth use of surgical instruments, and can perform local surgical treatment such as drainage or injection when necessary.

[0052] A sealing channel can be formed on the sheath seal 323 ; the axial through hole 3213 , the sealing channel, the sheath connecting channel 3241 and the sheath axial channel 313 constitute a surgical channel of the sheath structure 3 .

[0053] The pointed needle core 11 is a solid structure and can be inserted into a surgical channel to cooperate with the sheath structure 3 for puncture.

[0054] The round-ended needle core 21 includes a round-ended needle body 212 and a needle core head 211 connected to the lower end of the round-ended needle body 212. The diameter of the needle core head 211 is larger than the diameter of the round-ended needle body 212. A head groove 2111 is provided on the outer side of the lower part of the round-ended needle core 21, and the needle core sealing part is sleeved on the head groove 2111. In this embodiment, the needle core sealing part is a sealing ring 23. The provision of the head groove 2111 meets the assembly requirements of the needle core sealing part. The outer diameter of the sealing ring 23 is slightly larger than the inner diameter of the sheath body 31. After the round-ended needle core 21 is inserted into the sheath body 31, the needle core sealing part is stuck in the axial channel 313 of the sheath, so that the needle core sealing part is sealed inside the lower end of the sheath body 31. The needle core sealing part and the sheath body 31 constitute a sealing structure, providing sealing conditions for subsequent drainage or injection. The diameter of the round-head needle body 212 is smaller than the inner diameter of the sheath body 31 , so a cavity can be formed inside the sheath body 31 , thereby ensuring smooth inflow and outflow of liquid.

[0055] A sheath scale portion 312 is provided on the outer surface of the sheath body 31 . The interval between two adjacent scale lines on the sheath scale portion 312 is 1 cm. The sheath scale portion 312 is provided to facilitate doctors in measuring the puncture depth during use.

[0056] The upper end surface of the sheath seat cover 321 is provided with an inner tapered hole; the pointed needle seat 12 is provided with a pointed tapered protrusion inside, which can be inserted into the inner tapered hole; the round needle seat 22 is provided with a round tapered protrusion inside, which can be inserted into the inner tapered hole. The inner tapered hole can be a Luer inner tapered hole.

[0057] In this embodiment, the pointed needle seat 12 is a Luer connector; the upper end of the sheath seat cover 321 is provided with an upper cover external thread, and the pointed needle seat 12 is connected to the sheath seat cover 321 through threads.

[0058] As shown in FIG13 , the lower portion of the sidewall of the upper cover groove 3211 of the sheath tube seat upper cover 321 is provided with an upper cover groove flange 3215. A base protrusion 3246 is provided on the outer circumference of the sheath tube seat base 324. The upper cover groove flange 3215 and the base protrusion 3246 form an interference fit. When the sheath tube seat base 324 is inserted into the upper cover groove 3211 and the base protrusion 3246 is above the upper cover groove flange 3215, the upper cover groove flange 3215 can prevent the base protrusion 3246 from moving outward. The upper cover groove flange 3215 and the base protrusion 3246 form a disassembly-resistant structure.

[0059] An internal thread 3214 is provided in the groove 3211 of the upper cover, and an external thread 3245 is provided on the outer surface of the top of the sheath tube seat base 324. The internal thread 3214 of the upper cover can be connected to the external thread 3245 of the base, so that the sheath tube seat upper cover 321 can be movably connected to the sheath tube seat base 324.

[0060] The sheath structure 3 also includes a gasket 322, which is disposed between the axial protrusion 3212 and the sheath seal 323. The gasket 322 is provided to prevent the axial protrusion 3212 of the sheath seat cover 321 from directly contacting the sheath seal 323. This prevents wear and tear of the sheath seal 323 caused by repeated rotation and adjustment of the sheath seat cover 321, thereby reducing the frequency of use of the sheath structure 3. In this embodiment, the upper end of the gasket 322 is connected to the lower end of the axial protrusion 3212 of the sheath seat cover 321, and the lower end of the gasket 322 is connected to the upper end of the sheath seal 323. The gasket 322 is made of a hard plastic material and has a certain degree of smoothness.

[0061] The sheath seal 323 is a circular ring structure with a central circular hole and is made of elastic material. When the sheath seal 323 is subjected to the extrusion force exerted by the axial protrusion 3212 , the diameter of the central circular hole of the sheath seal 323 is reduced.

[0062] When the sheath seal 323 is not subjected to the squeezing force exerted by the axial protrusion 3212, the sheath seal 323 is in an initial state. At this time, the middle circular hole of the sheath seal 323 has not shrunk, and the middle circular hole of the sheath seal 323 can ensure that surgical instruments pass through smoothly.

[0063] In this embodiment, the use of the sheath seal 323 is explained by taking the example of the pointed needle core 11 being inserted into the middle circular hole of the sheath seal 323. When the sheath seal 323 is in a state of not sealing the pointed needle core 11, the sheath seat cover 321 does not squeeze the gasket 322 and the sheath seal 323. At this time, the sheath seal 323 is not deformed, the sheath seal 323 is in an initial state, the middle circular hole of the sheath seal 323 is not reduced, and a gap is formed between the sheath seal 323 and the pointed needle core 11. When it is necessary to seal the pointed needle core 11 inserted in the middle circular hole, the internal thread 3214 of the upper cover part of the sheath seat upper cover 321 and the external thread 3245 of the base part of the sheath seat base 324 rotate and push each other to form axial pressure, which will squeeze the gasket 322 and the sheath tube seal 323. Since the sheath tube seat base 324 is a rigid structure as a whole, and the sheath tube seal 323 is made of elastic material, the sheath tube seal 323 will undergo elastic deformation, and eventually the sheath tube seal 323 will fill the remaining space between the gasket 322 and the sheath tube seat base 324, and the sheath tube seal 323 in the squeezed state will also reduce the diameter of the middle circular hole, and finally ensure that there is no gap between the pointed needle core 11 and the sheath tube seal 323, so as to achieve the sealing effect. At this time, the middle circular hole in the sheath tube seal 323 is reduced to a sealing channel. At the same time, the sheath tube structure 3 also has an adjustment function. When the sealing state needs to be unlocked, the unlocking and sealing function can be achieved by adjusting and rotating the sheath tube seat cover 321 in the reverse direction.

[0064] The central circular hole of the sheath tube seal 323 can also be used to insert surgical instruments such as the round-tipped needle core 21, biopsy needle, or ablation needle. Before inserting a surgical instrument, the diameter of the central circular hole in the sheath tube structure 3 must be confirmed. If the outer diameter of the surgical instrument exceeds the diameter of the central circular hole, the surgical instrument cannot pass through.

[0065] In this embodiment, the inner diameter of the unreduced sheath seal 323 is greater than or equal to 3.0 mm. The sheath seal 323 can be made of rubber or silicone. The hardness of the sheath seal 323 should not be too high, and should not exceed 60 Shore A hardness, to facilitate adjustment and sealing. The sheath seal 323 meets the requirements of conventional percutaneous surgical instruments and avoids the shortcomings of conventional gasket-type sealing structures, such as poor permeability and mediocre sealing performance.

[0066] During the sealing operation at the sheath seal 323, the threads at the connection between the sheath cover 321 and the sheath base 324 are screwed in and out, achieving both inelastic and fully elastic deformation of the sheath seal 323. When the sheath seal 323 is inelastic, the passage is unobstructed, facilitating the entry and exit of various surgical instruments. When the sheath seal 323 is fully elastically deformed, the sheath seal 323 forms a seal with the inserted surgical instrument.

[0067] To facilitate quantification of the tightness of the seal and the type of instrument used, a base scale 3247 is provided on the outer surface of the sheath seat base 324. Since the sheath seat cover 321 and the sheath seat base 324 are threaded together, a sheath seal 323 is positioned between the two components. When the sheath seat cover 321 and the sheath seat base 324 move toward each other, squeezing the sheath seal 323 effectively reduces the diameter of the central circular sealing hole of the sheath seal 323. A corresponding base scale 3247 is added to the sheath seat base 324. When the lower edge 3216 of the sheath seat cover reaches the corresponding scale bar on the base scale 3247, it indicates that the instrument with the corresponding outer diameter can be sealed, thus facilitating operation by the physician. In actual use, the physician can flexibly and freely select the corresponding scale position based on the outer diameter of the instrument to be sealed. The coaxial sealing device of the present invention is suitable for instruments with diameters ranging from 15G to 20G, but its scope of application can be expanded as needed.

[0068] The connector 3244 is connected to the valve 34 via the drainage tube 33. The sheath body 31 is used to establish a surgical channel and external support. The sheath structure 3 can not only satisfy the sealing function, but also play the role of diverting and connecting the sheath body 31 and the drainage tube 33. The drainage tube 33 is a general PVC catheter whose size meets the matching requirements. The drainage tube 33 connects the sheath structure 3 to the valve 34. The valve 34 can be a two-way valve, a three-way valve, or a four-way valve. In this embodiment, the valve 34 is a three-way valve. The valve 34 can be selected in combination with the final requirements.

[0069] The sheath base 324 is further provided with two channels, namely a sheath connection channel 3241 and a drainage channel 3242. The sheath connection channel 3241 is directly connected to the sheath body 31, and the drainage channel 3242 is connected to the drainage tube 33 so that liquid can flow in and out of the channel in a sealed state.

[0070] The sheath structure 3 also includes a positioning ring 35; the positioning ring 35 is sleeved on the sheath body 31. The positioning ring 35 is installed on the sheath body 31. After the puncture is completed, the doctor pushes the positioning ring 35 to the skin surface to prevent the sheath body 31 from further entering the patient's body and affecting the puncture depth accuracy. Therefore, the positioning ring 35 is used to limit the depth.

[0071] Figures 16 and 17 illustrate the principle diagrams of two operational states of the fluid within the coaxial sealing device when it is in a sealed state. When the coaxial sealing device is in a sealed state, the sheath connection channel 3241 and the drainage channel 3242 are completely unobstructed, preventing any diversion in other directions. Therefore, the original drainage device design can be operated without being affected by the gap between the original device and the device. Positive or negative pressure is applied to the remaining enclosed portion of the sheath holder base 324. As shown in Figure 16, when arrows C and D point from the sheath connection channel 3241 to the drainage channel 3242, the device is operating under negative pressure, intended to expel fluids from the patient's body, such as gas or blood. This is a drainage operation. As shown in Figure 17, when arrows E and F point from the drainage channel 3242 to the sheath connection channel 3241, the device is operating under positive pressure, intended to inject a desired fluid, such as saline or medication, into the patient's body. This is an injection operation. Reasonable use of the sealing state of the coaxial sealing device of the present invention can achieve better surgical results.

[0072] FIG18 illustrates a schematic diagram of the overall drainage principle of the coaxial sealing device of the present invention in one state of use. This state must be used in conjunction with the round-ended needle assembly 2. When the coaxial sealing device is in the sealed state, medical personnel can connect a suction device to the Luer port 341 of the three-way valve to perform suction. Blood or other fluids in the patient's body can enter the drainage tube 33 through the through-holes 311 in the sheath body 31, ultimately achieving the purpose of drainage. The suction device is a syringe. As shown in FIG7 , multiple through-holes 311 are evenly distributed on the outer surface of the lower end of the sheath body 31. As shown in FIG18 , the sheath seal 323 allows liquid to enter only through the through-holes 311 in the sheath body 31. This design facilitates uniform drainage of liquids. Furthermore, when the round-ended needle assembly 2 is removed, only the sheath base assembly 32 is sealed, allowing direct suction and drainage through the large aperture at the lower end of the sheath body 31. Specific requirements will depend on actual conditions.

[0073] Figure 19 illustrates the injection principle of the coaxial sealing device of the present invention in one state of use. This state requires use with the round-tipped needle assembly 2. When the coaxial sealing device is in the sealed state, medical personnel can perform liquid injection by connecting the pusher to the Luer connector 341 of the three-way valve. The injection liquid enters the sheath base 324 through the drainage tube 33. Due to the large gap between the inner wall of the sheath base 324 and the round-tipped needle core 21, the liquid flows through the gap between the inner wall of the sheath base 324 and the round-tipped needle core 21 and flows between the sheath body 31 and the round-tipped needle core 21. The pusher is a syringe; liquid injection refers to the injection of saline or medication. Simultaneously, under the action of the sheath seal 323, the liquid flows evenly out of the through-holes 311 in the sheath body 31, reaching the target tissue. The multiple through-holes 311 evenly distributed on the outer surface of the lower end of the sheath body 31 ensure more uniform distribution of the liquid, achieving effective and wide-area use.

[0074] As shown in Figures 1 to 19, the coaxial sealing device for puncture surgery in this embodiment is a sealing adjustment device with a coaxial sheath body 31 and a tube wall through hole 311. It makes the sealing adjustment more flexible and practical during percutaneous puncture surgery, can ensure flexible sealing function, and is suitable for use in a caliber range of 0-3mm, ensuring full coverage of the sealing during percutaneous puncture surgery.

[0075] By providing two matching structures of a pointed needle assembly 1 and a round needle assembly 2, it is possible to flexibly switch between the puncture function and the sealed injection liquid, providing a multi-purpose direction; by using the round needle assembly 2, it is possible to meet the drainage and injection functions.

[0076] By evenly distributing multiple through-holes 311 on the outer surface of the lower end of the sheath body 31, the size of the through-holes 311 can be adjusted as needed, typically within a range of 0.1 mm to 0.5 mm. The number, shape, and distribution of through-holes 311 are, but are not limited to, those of the present invention and can be adjusted by the user based on actual needs. This ensures that the sheath meets puncture requirements while avoiding the narrow use of the sheath axial channel 313 within a single sheath body 31, thereby fundamentally expanding the range of drainage and injection areas.

[0077] The internal and external threaded structures of the sheath tube seat cover 321 and the sheath tube seat base 324 cooperate to ensure that the sheath tube seal 323 is internally squeezed while being screwed in and out to adjust the sealing diameter of the sheath tube seal 323, thus providing an adjustable sealing aperture and avoiding the conventional single, non-adjustable sealing method that relies solely on fixed elasticity. The original fixed sealing method, due to its non-adjustability, can cause large-diameter instruments to be too tight and pass poorly, while small-diameter instruments can pass well but have poor sealing effects. In comparison, the coaxial sealing device of the present invention has better passability and sealing effects, and a wider range of sealing applications.

[0078] By adding a base scale portion 3247 to the sheath base 324, the outer diameter of the surgical instrument to be sealed can be more accurately adjusted, making it easier for the physician to intuitively adjust the sealing position to the desired location while avoiding over-adjustment, such as over-loosening or over-tightening the sheath base 324 during use. In this embodiment, a commonly used instrument scale covering a range from 15G to 20G is listed, which generally covers a wide range of application scenarios. However, the present invention is not limited to this range, and in actual use, the scope of use of the adaptor can be expanded as needed.

[0079] The upper cover groove flange portion 3215 of the sheath seat upper cover 321 and the base protrusion 3246 of the sheath seat base 324 form a mating nested structure. Before the sheath seat upper cover 321 and the sheath seat base 324 engage with the internal and external threads, they are pre-assembled through interference, forming a self-limiting anti-disassembly structure. This structure can prevent the sheath seat upper cover 321 from falling off due to the threads exceeding the limit when the coaxial sealing device is used by the doctor, affecting the doctor's operating habits. It can also ensure that the sealing range of the sheath seat assembly 32 is accurately defined, thereby improving the accuracy of the seal.

[0080] By adding a gasket 322 between the axial protrusion 3212 and the bottom surface of the base groove 3243, direct contact between the sheath seat base 324 and the sheath seal 323 can be ensured, thereby preventing the sheath seal 323 from being damaged or even torn due to rotation adjustment after frequent use of multiple instruments, thereby affecting the sealing of the coaxial sealing device.

[0081] By providing a three-way valve on the sheath base 324, a drainage or injection liquid channel can be added while retaining the original puncture channel. The drainage or injection liquid channel is designed at the lower end of the sealing port. This ensures that the drainage or injection liquid channel is unobstructed when the transfer channel is sealed, thereby expanding the use function of the device of the present invention.

[0082] By designing and controlling the length of the sheath body 31 and the overall axial length of the sheath base assembly 32, the total length is guaranteed to meet the conventional length of a coaxial needle, ensuring consistency with conventional coaxial needles. This allows the product to be used directly during biopsies, achieving a perfect combination with a biopsy gun. Furthermore, users can customize the model specifications of the device according to the range of conventional coaxial needle lengths.

[0083] By adding a three-way valve at the end of the drainage tube 33, the user can ensure the use of drainage or injection by adjusting the opening and closing of the three-way valve. In addition, the valve 34 at the end of the drainage tube 33 can be but not limited to a three-way valve, and can be selected according to actual needs.

[0084] The coaxial sealing device is a disposable component to avoid cross infection.

[0085] The coaxial sealing device can be used with other percutaneous puncture sheath type instruments except the pointed needle assembly 1 and the round needle assembly 2, and the diameter of the instrument generally does not exceed 3 cm.

[0086] The adjustment direction of the sheath seat upper cover 321 is designed to be along the axial direction when looking down at the sheath body 31. When adjusted clockwise, the aperture of the middle circular hole of the sheath seal 323 becomes smaller, and when adjusted counterclockwise, the aperture of the middle circular hole of the sheath seal 323 becomes larger.

[0087] Example 2

[0088] As shown in Figure 20, the difference between this embodiment and Example 1 is that the top of the sheath tube seat base 324 is inserted into the groove 3211 of the upper cover; a cross-cut portion 3231 is provided in the middle of the sheath tube seal 323; when the sheath tube seat upper cover 321 moves downward, the axial protrusion 3212 pushes the sheath tube seal 323, and the sealing portion channel formed by the cross-cut portion 3231 opens; when the sheath tube seat upper cover 321 moves upward, the axial protrusion 3212 moves away from the sheath tube seal 323, and the sealing portion channel formed by the cross-cut portion 3231 closes.

[0089] The sheath tube seat base 324 and the upper cover groove 3211 form a push-pull sliding structure. Under conditions where the sealing conditions are not particularly harsh, the push-pull sliding structure of this embodiment can be used for sealing. This structure makes operation simpler and more convenient. When the sheath tube seat upper cover 321 moves downward, the sealing channel formed by the cross-cut portion 3231 opens; when the sheath tube seat upper cover 321 moves upward, the sealing channel formed by the cross-cut portion 3231 can be closed and sealed in time.

[0090] Example 3

[0091] As shown in FIG21 , the difference between this embodiment and embodiment 1 is that no upper cover groove flange portion 3215 is provided on the sheath tube seat upper cover 321, no base protrusion portion 3246 is provided on the sheath tube seat base 324, and no gasket 322 is provided in the sheath tube structure 3, so the structure of the coaxial sealing device is simplified.

[0092] Example 4

[0093] As shown in FIG22 , this embodiment differs from Example 1 in that the needle core head 211 is not provided with a head groove 2111. The needle core head 211 serves as a needle core sealing portion. Therefore, the needle core head 211 is stuck in the sheath axial channel 313, so that the needle core head 211 is sealed inside the lower end of the sheath body 31. The needle core head 211 as a whole serves as a sealing structure. Although its sealing degree is not as high as that of the sealing ring 23 in Example 1, it has better stability and safety in use, is simple and convenient to install, and is designed with appropriate matching dimensions to meet the functional requirements of drainage or injection and spraying.

[0094] The coaxial sealing device has an additional drainage channel 3242 inside. Through the integrated structure of puncture, sealing, drainage and injection, the relevant operating procedures of percutaneous surgery are simplified. Doctors can easily perform a series of operations such as puncture, biopsy, drainage, injection and ablation, making the surgery safer, more convenient and efficient.

[0095] The coaxial sealing device of the present invention can not only effectively seal the surgical channel, but also ensure the smooth use of surgical instruments and the performance of local surgical treatments when necessary, such as drainage or injection, which will greatly reduce surgical risks and improve the success rate and effectiveness of the surgery.

[0096] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0097] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A coaxial sealing device for puncture surgery, characterized in that, Including: A sheath structure (3), a sharp-tipped stylet (11) and a round-tipped stylet (21); The sheath structure (3) includes a sheath base assembly (32) and a sheath body (31). The sheath base assembly (32) includes a sheath base upper cover (321), a sheath base bottom (324) and a sheath part seal (323). On the bottom surface of the sheath base upper cover (321), there is an upper cover part groove (3211). In the upper cover part groove (3211), there is an axially protruding member (3212). On the axially protruding member (3212), there is an axially through hole (3213). On the top surface of the sheath base bottom (324), there is a base part groove (3243). On the bottom surface of the sheath base bottom (324), there is a sheath connection channel (3241). The sheath connection channel (3241) communicates with the base part groove (3243). The top of the sheath base bottom (324) is installed in the upper cover part groove (3211). On the outer side surface of the bottom of the sheath base bottom (324), there is a connector (3244). On the connector (3244), there is a drainage channel (3242). The drainage channel (3242) communicates with the sheath connection channel (3241). The sheath part seal (323) is arranged in the base part groove (3243). The sheath part seal (323) is between the axially protruding member (3212) and the groove bottom surface of the base part groove (3243). The sheath body (31) is connected to the sheath connection channel (3241). In the sheath body (31), there is a sheath axial channel (313). On the outer side surface of the lower end of the sheath body (31), there is a wall through hole (311). The lower part of the round-tipped stylet (21) is provided with a stylet seal part. The round-tipped stylet (21) can sequentially pass through the axially through hole (3213), the sheath part seal (323), the sheath connection channel (3241) and the sheath axial channel (313). The stylet seal part can be stuck in the sheath axial channel (313). The sheath part seal (323) can cover the outer peripheral surface of the round-tipped stylet (21); The sharp-tipped stylet (11) can sequentially pass through the axially through hole (3213), the sheath part seal (323), the sheath connection channel (3241) and the sheath axial channel (313). The sheath part seal (323) can cover the outer peripheral surface of the sharp-tipped stylet (11).

2. The coaxial sealing device for puncture surgery according to claim 1, wherein: The sheath part seal (323) is a ring structure with a middle round hole. The sheath part seal (323) is made of an elastic material. When the sheath part seal (323) is subjected to the extrusion force applied by the axially protruding member (3212), the diameter of the middle round hole of the sheath part seal (323) shrinks.

3. The coaxial sealing device for puncture surgery according to claim 2, wherein: The upper cover part groove (3211) is provided with an internal thread (3214) of the upper cover part. The outer side surface of the top of the sheath tube seat base (324) is provided with an external thread (3245) of the base part. The internal thread (3214) of the upper cover part can be connected to the external thread (3245) of the base part.

4. The coaxial sealing device for puncture surgery according to claim 2, wherein: The sheath tube structure (3) further includes a gasket (322). The gasket (322) is arranged between the axially protruding member (3212) and the sheath tube part seal (323).

5. The coaxial sealing device for puncture surgery according to claim 1, wherein: The top of the sheath tube seat base (324) is inserted into the upper cover part groove (3211). The middle part of the sheath tube part seal (323) is provided with a cross cut part (3231). When the upper cover of the sheath tube seat (321) moves downward, the axially protruding member (3212) pushes the sheath tube part seal (323), and the sealing part channel formed by the cross cut part (3231) is opened. When the upper cover of the sheath tube seat (321) moves upward, the axially protruding member (3212) moves away from the sheath tube part seal (323), and the sealing part channel formed by the cross cut part (3231) is closed.

6. The coaxial sealing device for puncture surgery according to claim 1, characterized in that: The upper end of the pointed needle core (11) is connected to the pointed needle seat (12), and the upper end of the round head needle core (21) is connected to the round head needle seat (22). The pointed needle seat (12) can be connected to the upper cover of the sheath tube seat (321), and the round head needle seat (22) can be connected to the upper cover of the sheath tube seat (321).

7. The coaxial sealing device for puncture surgery according to claim 1, characterized in that: The connector (3244) is connected to the valve (34) through a drainage tube (33).

8. The coaxial sealing device for puncture surgery according to claim 1, wherein: The round head needle core (21) includes a round head needle body (212) and a needle core head (211) connected to the lower end of the round head needle body (212). The diameter of the needle core head (211) is larger than the diameter of the round head needle body (212). The needle core head (211) is the needle core sealing part.

9. The coaxial sealing device for puncture surgery according to claim 1, characterized in that: The outer side surface of the lower part of the round head needle core (21) is provided with a head groove (2111). The needle core sealing part is a sealing ring (23), and the sealing ring (23) is sleeved on the head groove (2111).

10. The coaxial sealing device for puncture surgery according to claim 1, characterized in that: The sheath tube structure (3) further includes a positioning ring (35). The positioning ring (35) is sleeved on the sheath tube body (31).

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