CN109124733B

CN109124733B - Puncture outfit and cannula assembly thereof

Info

Publication number: CN109124733B
Application number: CN201710513370.9A
Authority: CN
Inventors: 孙宝峰; 马猛
Original assignee: Jiangsu Fengh Medical Equipment Co Ltd
Current assignee: Jiangsu Fengh Medical Equipment Co Ltd
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2020-11-10
Anticipated expiration: 2037-06-28
Also published as: CN109124733A

Abstract

The invention discloses a cannula assembly for a puncture instrument, comprising a housing of a working channel which is set for the passage of an instrument, wherein the aperture of the working channel is defined as a working aperture; the cleaning assembly comprises an absorption piece and a scraping piece; the hole diameter of the central hole of the absorption piece is defined as a first hole diameter; the diameter of the central hole of the scraping piece is defined as a second diameter; the first aperture is less than or equal to a second aperture, and the second aperture is less than or equal to the working aperture; the absorbent member also has a plurality of radially extending slits or slots. When the instrument is pulled out from the abdominal cavity to the outside of the body through the cannula assembly, the scraping assembly firstly scrapes the attached liquid on the instrument, the absorption member absorbs the scraped liquid again, the fluid is effectively prevented from being deposited on the cannula assembly along with the detection device, and the cannula assembly or the puncture outfit which is polluted again because the detection device is inserted into the cannula assembly again is reduced.

Description

Puncture outfit and cannula assembly thereof

Technical Field

The invention relates to a surgical instrument, in particular to a puncture outfit and a sleeve assembly thereof, belonging to the field of medical instruments.

Background

The use of laparoscopic surgery in surgical procedures has become widely accepted, and has many advantages over traditional open surgery, including reduced trauma, faster healing, and reduced risk of infection. A puncture instrument is a surgical instrument used in laparoscopic surgery for establishing an artificial passage into a body cavity and generally consists of a cannula assembly and a puncture core assembly. The general clinical use mode is as follows: firstly, a small opening is cut on the skin of a patient, then the puncture core component penetrates through the cannula component, and then the cannula component is driven to penetrate through the abdominal wall through the skin opening to enter the body cavity. Once inside the body cavity, the puncture core assembly can be removed, leaving the cannula assembly as a passage for instruments into and out of the body cavity.

Laparoscopic surgery typically entails insufflating carbon dioxide into the abdominal cavity to lift the abdominal wall away from the internal organs, and then establishing and maintaining a stable pneumoperitoneum to obtain sufficient surgical operating space. Cannula assemblies are typically comprised of a cannula, a housing, a sealing membrane (also known as an instrument seal) and a zero seal (also known as a self-seal). The housing connects the sleeve, zero seal and sealing membrane into a sealed system. The zero seal generally does not provide a seal for the inserted instrument, but automatically closes and forms a seal when the instrument is removed, and the sealing membrane grips the instrument and forms a seal when the instrument is inserted. The cannula penetrates from outside the body cavity to inside the body cavity as a passage for instruments to and from the body cavity. In laparoscopic surgery, the instrument typically includes a probe device and a surgical device. The probe device includes an endoscope or laparoscope to allow the surgeon to view the surgical field on an external monitor coupled to the probe device. The surgical devices mainly include devices for performing surgical operations, such as staplers, forceps, and scalpels.

In a single surgical procedure, instruments are often inserted and removed through the cannula assembly multiple times, particularly for the probing device. After the detection device is in the abdominal cavity for a period of time, the fluid in the abdominal cavity can be attached to the lens of the detection device to affect the visual field definition of the detection device, and in order to ensure that the detection device has an operation visual field with enough definition, the detection device needs to be removed through the sleeve pipe assembly and cleaned in vitro. During each insertion and removal, the fluid attached to the probe enters the interior of the cannula assembly along with the probe, and the fluid is deposited on the cannula, zero seal, or sealing membrane within the cannula assembly. When the probe assembly is passed through the sleeve assembly again after being cleaned in vitro, the fluid deposited in the sleeve assembly may adhere to the probe assembly again, re-contaminating the probe assembly, again affecting the visibility of the probe assembly. Thus, the probe device requires multiple removals from the body for in vitro cleaning in a single procedure, which is a time consuming process and increases the likelihood of complications and surgical contamination due to the multiple repeated insertions and removals of the probe device.

Accordingly, it is desirable to provide a cannula assembly or penetrator that prevents fluid from being deposited onto the cannula assembly with a probe device, and that reduces the likelihood of the probe device being re-contaminated when re-inserted into the cannula assembly.

Disclosure of Invention

The present invention is directed to a cannula assembly that prevents fluid from being deposited onto the cannula assembly with a probe device to reduce the possibility of re-contamination of the probe device when it is re-inserted into the cannula assembly.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a cannula assembly for a puncture instrument comprising: a housing including a working channel for passage of an instrument, the working channel having an aperture defined as a working aperture; a gas injection port formed in the housing and communicating with the working channel, from which injected gas can be sent to the workpiece channel; a seal assembly disposed within the housing; wherein the cannula assembly further comprises a cleaning assembly disposed within the housing, the cleaning assembly comprising an absorbent member and a scraper member, the absorbent member and the scraper member each having a central aperture through which the instrument passes; the absorbent member may absorb and/or absorb fluid; the absorbent member has at least two slits extending in a radial direction.

Further, the central hole of the absorbent member is a first central hole, and the pore diameter of the first central hole is defined as a first pore diameter; the central hole of the scraping piece is a second central hole, and the aperture of the second central hole is defined as a second aperture; the first aperture is less than or equal to the second aperture, and the second aperture is less than or equal to the working aperture.

Further, the at least two gaps are evenly distributed.

Further, the scraper has a vent through which the injected gas enters the working channel.

Further, the vent of the scraping member is at least partially overlapped with the slit of the absorbing member.

Further, the absorbing member has a vent, and the vent of the scraping member and the vent of the absorbing member are at least partially overlapped.

Further, the central hole of the scraping member is tapered, and the orifice diameter of the central hole in the direction toward the absorbent member is larger than that of the orifice on the opposite side.

Furthermore, a plurality of fine capillaries are arranged on the absorption piece or the material texture adopted by the absorption piece has capillary action.

Further, the surface of the sealing component is coated with a coating made of water-repellent material, or the manufacturing material of the sealing component comprises the water-repellent material.

Further, the water-repellent material includes the following materials: one or at least two of metal complex containing long chain fatty acid, organosilicon, fluorine-containing polymer and rubber material containing wax component.

Further, the water repellent material is a nano material.

Further, the absorbent member includes the following first group of materials: one or at least two of pulverized wood pulp fluff, cellulose fiber, polymeric gelling agent, hydrophilic nonwoven fabric, cellulose, sodium polyacrylate, cotton fabric, polyethylene terephthalate, polyethylene, polypropylene, polyvinyl chloride, ABS, polyamide, polystyrene, polyvinyl alcohol, polycarbonate, ethylene-methacrylate copolymer, polyacetal.

Further, the absorbent member includes a second group of materials comprising: one or at least two of silica gel, alumina, zeolite, activated carbon, graphite, cellulose, porous polymer matrix, perlite, metal hydroxide, metal oxide/cellulose acetate, metal oxide/cellulose butyrate and metal oxide/cellulose nitrate, polyamide, polysulfone, vinyl polymer, polyester, polyolefin and PTFE, porous glass or glass ceramic, graphite oxide, polyelectrolyte complex, alginate gel.

Further, the absorbent member includes the first set of materials and the second set of materials.

Further, the thimble assembly includes a plurality of the absorbing piece, a plurality of the absorbing piece is range upon range of the setting, and a plurality of the gap cross of absorbing piece is range upon range of.

Furthermore, a plurality of positioning columns are arranged on the inner wall of the shell, and the cleaning assembly is fixed on the positioning columns through positioning pieces.

It is another object of the present invention to provide a puncture instrument that can prevent fluid from being deposited onto a cannula assembly of the puncture instrument with a probe device, and can reduce the probability of recontamination of the probe device when it is reinserted into the cannula assembly.

To achieve the above object, the present invention provides a puncture instrument comprising the cannula assembly as set forth in any one of the above, further comprising a puncture core rod, wherein the puncture core rod can penetrate through the cannula assembly.

The beneficial effects after the implementation of the invention are as follows: a cleaning assembly is disposed within the cannula assembly and includes an absorbent member having fluid absorbing and/or adsorbing properties and a scraping member having a scraping function. When the instrument is withdrawn from the abdominal cavity through the cannula assembly, the scraping member first scrapes adherent fluid on the instrument and the absorbent member reabsorbs the scraped fluid. When the instrument passes through the cleaning assembly and then passes through the sealing assembly, because the fluid attached to the instrument is cleaned by the cleaning assembly, the fluid is not attached to or remained on the sealing assembly. Thus, when a clean instrument is passed through the cannula assembly again, the instrument (and in particular the probe device) is not contaminated again by fluid. Preferably, the absorbent member is in direct contact with the implement to more easily absorb adherent fluid on the implement that is not wiped clean by the wiping member. Preferably, the absorbent member further has a plurality of radially extending slits or slits effective to reduce friction during passage of the device through the cannula assembly while enhancing fluid absorption.

Drawings

FIG. 1 is a schematic perspective view of a puncture instrument according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a cannula assembly according to an embodiment of the present invention;

3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 of 3 the 3 sleeve 3 assembly 3 of 3 FIG. 32 3 taken 3 along 3 line 3 A 3- 3 A 3; 3

FIG. 4 is an exploded view of a cleaning assembly and a spacer according to an embodiment of the present invention;

fig. 5 is a perspective view of an absorbent member according to an embodiment of the present invention;

FIG. 6 is a perspective view of a scraper member according to an embodiment of the invention;

FIG. 7 is a cross-sectional view of the scraper member of FIG. 6 taken along line B-B;

figure 8 is an exploded view of a cleaning assembly and spacer according to another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

For easier understanding, the side closer to the clinician is first set to be the proximal end, while the side further away from the clinician, i.e., the side closer to the patient's body, is set to be the distal end. Referring to FIG. 1, the top of the figure shows the end near the clinician, the proximal end; the lower side of the figure is the end which is in contact with the patient's body and is considered as the distal end. Referring to fig. 1, there is shown an overall structure of a puncture instrument 100 according to a preferred embodiment of the present invention. A puncture instrument 100 comprises a puncture core rod 1 and a sleeve assembly 2, wherein the puncture core rod 1 is inserted into the sleeve assembly 2 in an initial state.

3 fig. 32 3 and 33 3 are 3 a 3 schematic 3 view 3 of 3 the 3 overall 3 structure 3 of 3 the 3 cannula 3 assembly 32 3 with 3 the 3 piercing 3 core 31 3 removed 3 and 3 a 3 cross 3- 3 sectional 3 view 3 thereof 3 taken 3 along 3 line 3 a 3- 3 a 3 in 3 fig. 32 3, 3 respectively 3. 3 Cannula assembly 2 has a proximal end 22 and a distal end 24, with proximal end 22 being outside the patient and distal end 24 being inside the patient during surgery. The instrument enters the body cavity through the opening of the proximal end 22 to the opening of the distal end 24, the passage through the opening of the proximal end 22 to the opening of the distal end 24 being defined as the working passage, the bore diameter of which is defined as the working bore diameter d₀. In one application, the piercing mandrel 1 is inserted through the cannula assembly 2, and the cannula assembly 2 is then driven together through the abdominal wall through the skin opening into the body cavity. Once inside the body cavity, the piercing mandrel 1 is removed and the cannula assembly 2 is left in place as a passage for the device into and out of the body cavityAnd (4) carrying out the following steps. A preferred cannula assembly 2 includes a seal assembly including a first seal assembly 3 and a second seal assembly 4. The clamping groove of the first sealing component 3 and the clamping hook of the second sealing component 4 are matched and fastened. The first seal assembly 3 and the second seal assembly 4 are provided non-detachably by snap-on formations 39 on the housing. The snap structure 39 integrates the first seal assembly 3 and the second seal assembly 4 by interference press fit. Alternatively, the first seal assembly 3 and the second seal assembly 4 may be designed to be detachable, such as threaded connections, rotating bayonets, or other detachable structures.

Fig. 3 depicts the composition and assembled relationship of the first seal assembly 3. The first seal assembly 3 includes a lower housing 30, the lower housing 30 including an elongated tube 31, the elongated tube 31 defining a cannula 32 extending through the distal end 24 and being connected to a housing 33. The lower housing 30 has an inner wall 34 supporting a duckbill seal 36 and an air valve mounting aperture 35 communicating with the inner wall 34. A valve spool 350 (shown in fig. 2) is mounted in the valve body 352 and together in the mounting bore 35. The flange 362 of the duckbill seal 36 is sandwiched between the inner wall 34 and the lower cap 37. The fixing manner between the lower cover 37 and the lower housing 30 is various, and interference fit, ultrasonic welding, gluing, fastening and the like can be adopted. The 4 mounting posts of the lower cap 37 in this embodiment are an interference fit with the 4 mounting holes 35 of the lower housing 30, which causes the edges of the duckbill seal 36 to be in compression. Referring to fig. 2 and 3, the sleeve 32, inner wall 34, duckbill seal 36, valve body 352 and valve core 350 together comprise a first chamber. In the present embodiment, the duckbill seal 36 is a single slit, but other types of closure valves, including flapper valves, multi-slit duckbill valves, may be used. The duckbill 360 of the external instrument can open when it penetrates the duckbill seal 36, but it does not normally provide a complete seal with respect to the instrument. When the instrument is removed, the duckbill 360 automatically closes, thereby preventing fluid in the first chamber from leaking out of the body.

Fig. 3 also depicts the composition and assembled relationship of the second seal assembly 4. The second seal assembly 4 includes an upper cover 40, a seal membrane assembly 42 and an upper housing 41. The sealing membrane assembly 42 is sandwiched between the upper cover 40 and the upper case 41. The upper housing 41 and the upper cover 40 are fixed by various methods, such as interference fit, ultrasonic welding, gluing, and snap-fit. The connection mode shown in this embodiment is that the upper case 41 and the upper cover 40 are fixed by ultrasonic welding. This securement places the proximal edge of the sealing membrane assembly 42 in compression. Preferably, a protective pad 43 is further disposed above the sealing film assembly 42. The protection pad 43 is used to prevent the tip of the instrument from piercing the sealing membrane assembly 42 and affecting the sealing effect of the instrument. The specific structure of the protective pad 43 can be a whole piece or a multi-lobe stacking type.

In a preferred embodiment, the first seal member 3 and/or the second seal member 4 are made of a water-repellent material or are surface-coated with a water-repellent material. When the instrument is withdrawn from the distal end 24 of the cannula assembly 2 towards the proximal end 22, the water-repellent properties of the seal assembly prevent fluid adhering to the outer diameter surface of the instrument from remaining on the seal assembly and dripping freely onto the cleaning assembly 5 or through the elongate tube 31 into the abdominal cavity. The water-repellent properties of the seal assembly prevent fluid from collecting on the seal assembly and the seal assembly does not re-contaminate the instrument when it is again passed through the cannula and contacted with the seal assembly after the instrument has been cleaned. Water repellent materials include, but are not limited to, the following materials: metal complex containing long chain fatty acid, organosilicon, fluorine-containing polymer, and rubber material containing wax component. Preferably, the water-repellent material can be made by nano-technology to form a nano-material with water-repellent property.

Fig. 3 and 4 depict the composition and assembly of the cleaning assembly 5. The cleaning assembly 5 includes a scraping member 51 and an absorbing member 52. The cleaning assembly 5 is disposed below the first sealing assembly 3 and at a distance from the mounting hole 35, within the space where the sleeve 32 interfaces with the first chamber. A plurality of positioning posts 353 are convexly arranged on the inner wall 34. The cleaning assembly 5 is fixed in the casing assembly 2 by the fitting of the positioning member 53 and the positioning post 353. As shown in fig. 4, a plurality of positioning holes 533 are distributed on the periphery of the positioning member 53, a plurality of positioning holes 523 are distributed on the periphery of the absorbing member 52 corresponding to the positioning member 53, and a plurality of positioning holes 513 are distributed on the periphery of the scraping member 51 corresponding to the positioning member 53. The positioning member 53, the absorbing member 52 and the scraping member 51 are fitted to the positioning posts 353 in this order from top to bottom. In this embodiment, the positioning posts 353 and the positioning holes are connected by interference fit. As the instrument is withdrawn from distal end 24 toward proximal end 22 of cannula assembly 2, scraper 51 first contacts and scrapes the outer diameter surface of the instrument and absorbent member 52 absorbs fluid scraped by scraper 51. Preferably, the positioning member 53 is made of a mass with a certain hardness, so as to position the cleaning assembly 5 more firmly, and effectively prevent the cleaning assembly 5 from being displaced during the insertion and extraction process of the instrument.

Reference herein to "fluid" includes liquids, including any type of bodily fluid (e.g., blood, mucosal fluid) and liquids introduced during surgery (e.g., saline). "fluid" also includes mixtures of liquids and solids and mixtures of gases and solids, as well as liquids or gases with particles (e.g., tissue fragments) suspended or located in the liquid or gas, and viscous materials and gases. When attached to the surgical instrument, the substance may adversely affect the function of the instrument or the use of the instrument by the surgeon.

Figure 5 depicts a perspective view of an absorbent member in an embodiment of the invention. The absorbent member 52 has a characteristic of specifically absorbing or adsorbing a fluid. The absorbent member 52 may be formed of a material having fluid absorbing and/or adsorbing properties. In particular, the absorbent member 52 is made of and/or includes a hydrophilic material to facilitate absorption of fluid. For example, the surface of the absorbent member may be coated using a known coating technique during the manufacturing process to make the absorbent member hydrophilic. Specific types of absorbent materials for the absorbent member 52 include, but are not limited to, the following types of materials: comminuted wood pulp fluff, cellulose fibers, polymeric gelling agents, hydrophilic nonwovens, cellulose, sodium polyacrylate, cotton fabric, polyethylene terephthalate, polyethylene, polypropylene, polyvinyl chloride, ABS, polyamide, polystyrene, polyvinyl alcohol, polycarbonate, ethylene-methacrylate copolymer, and polyacetal. The absorbent member 52 may also be made of a material having an adsorption property, and fluid is adsorbed on the absorbent member 52 by adsorption. Specific types of adsorbent materials for the absorbent member 52 include, but are not limited to, the following types of materials: silica gel, alumina, zeolites, activated carbon, graphite, cellulose, porous polymer matrices, perlite, metal hydroxides, metal oxide/cellulose acetate, metal oxide/cellulose butyrate and metal oxide/cellulose nitrate, polyamides, polysulfones, vinyl polymers, polyesters, polyolefins and PTFE, as well as porous glass or glass ceramics, graphite oxides, polyelectrolyte complexes, alginate gels, and the like. Of course, the absorbent member 52 may be made of a mixture of an absorbent material and an adsorbent material mixed in a predetermined ratio.

In a preferred embodiment, the absorbent member 52 has a wicking action in order to increase the thoroughness of the absorbent member 52 to fluid absorption. Specifically, a plurality of fine capillaries are provided on the absorbent member 52, and the capillaries effectively absorb and distribute the fluid on the absorbent member by capillary action; alternatively, the absorbent member 52 may be formed from a material that is textured with a wicking function to effectively absorb and distribute fluid on the absorbent member 52.

The absorbent member 52 has a central aperture 522 through which an instrument may pass during insertion or withdrawal of the cannula assembly 2. The diameter of the central bore 522 is a first bore diameter d₁. First aperture d₁Is less than or equal to the working aperture d₀So that the outer diameter surface of the instrument comes into contact with the hole wall surface of the central hole 522 of the absorbent member 52 during the passage of the instrument through the sheath assembly 2. When the speed is too fast during the instrument extraction process, the scraping piece 51 does not completely scrape the fluid on the surface of the instrument, and the absorption piece 52 is directly contacted with the surface of the instrument to effectively absorb the fluid remained on the surface. The absorbent member 52 may be in direct contact with the surface of the device, reducing the scraping ability requirements of the scraping member 51, so that the material of the scraping member 51 may be selected from materials having a general scraping ability without requiring a high grade of scraping ability, thereby effectively reducing the manufacturing cost of the entire puncture cannula 2.

The absorbent member 52 has at least two radially extending slits 526 that include slits or slits 526. The slits or slits are mainly different in size, and a case where the slits are narrow is called a slit, and a case where the slits are wide is called a slit. In this embodiment, the slits or slits 526 are 4 and are evenly distributed across the body of the absorbent member 52. When the instrument is inserted or withdrawn through the central hole 522, the slit or slit 526 of the body of the absorbing member 52 is effectively separated and moved in the direction of the frictional force, i.e., the movement direction of the instrument, by the frictional force generated by the movement of the instrument, so that the frictional resistance generated during the insertion or withdrawal of the instrument is effectively reduced, and the operation of the instrument by a doctor is more labor-saving. The slits or slits 526 are evenly distributed over the body of the absorbent member 52 so that the resolution of the frictional resistance is also even, thereby providing a better feel during the operation of the device by the physician. As will be appreciated by those skilled in the art, the at least two slits or slits 526 referred to herein, in particular embodiments, can also be provided uniformly with both slits and slits on the absorbent member 52.

The cleaning assembly 5 is disposed below the valve body 352 such that when the instrument or piercing mandrel 1 is inserted into the cannula assembly 2, the body of the absorbent member 52 effectively separates at the slit or slit 526 due to the frictional forces of the instrument or piercing mandrel 1, such that irrigation gas injected from the valve body 352 can flow into the elongated tube 31 through the separation of the slit or slit 526. However, the speed of gas inflow is greatly affected by the blocking action of the body of the absorption member 52, and the requirement for rapidity of the operation cannot be satisfied. In a preferred embodiment, the absorbent member 52 has at least one vent 525 therein. When an instrument or piercing mandrel 1 is inserted into cannula assembly 2, irrigation gas injected by valve body 352 flows rapidly through absorbent member 52 into elongated tube 31 via vent 525. As shown in fig. 5, in this embodiment, the vent holes 525 are circular holes, and 4 vent holes 525 are uniformly distributed on the absorbing member 52. As will be appreciated by those skilled in the art, the shape or form of the opening of the vent 525 need only be such that the opening is capable of allowing airflow therethrough, and the particular shape or form may take other shapes or forms, such as: square openings, triangular openings, irregularly shaped openings, and the like. The specific number of vents 525 and the distribution pattern on the absorbent member 52 can be determined based on the desired airflow rate and/or absorbent member material, and is not limited herein.

Fig. 6 depicts a perspective view of a scraper 51 in an embodiment of the invention. The scraping member 51 has a function of scraping the fluid. The scraping member 51 may be made of a material having a scraping function. In this embodiment, the scraper 51 is made of a flexible material capable of scraping off fluid adhering to the outer diameter surface of the instrument when in contact therewith. In particular, the scraper member 51 is made of polyisoprene material.

Scraper 51 has a central aperture 512, and instruments will pass through central aperture 512 during insertion or extraction of the cannula assembly 2. The diameter of the central hole 512 is a second aperture diameter d₂. Second aperture d₂Is less than or equal to the working aperture d₀So that the outer diameter surface of the instrument comes into contact with the hole wall surface of the central hole 522 of the absorbent member 52 during the passage of the instrument through the sheath assembly 2. Second aperture d₂The first aperture d of the absorption member 52 or larger₁Effectively ensuring that the scraping member 51 first contacts the outer diameter surface of the instrument to perform a scraping action

As shown in fig. 7, the central hole 512 of the scraper member 51 has a certain taper. Diameter d of aperture 5123 of central aperture 512 toward absorbent member 52₂₃Is larger than the diameter d of the aperture 5121 of the central hole 512 facing the opposite side₂₁And the opposite side refers to the side facing in the direction of the distal end 24. The diameter gradually tends to decrease in the direction from the aperture 5123 to the aperture 5121. As the device is withdrawn from cannula assembly 2 toward proximal end 22, central aperture 512 of wiper member 51 deforms in response to the frictional forces exerted by the device toward proximal end 22, and the tapered central aperture 512 helps to transmit the wiped fluid to absorbent member 52 closer to proximal end 22. The tapered central bore 512 helps to reduce the gripping force of the instrument as it is inserted into the cannula assembly 2 from the proximal end 22, thereby effectively reducing the insertion force of the surgeon when inserting the instrument and improving the comfort of the surgeon during the surgical procedure.

With continued reference to fig. 6, the scraper member 51 has at least one vent 515 therein. When an instrument or piercing mandrel 1 is inserted into cannula assembly 2, the perfusion gas injected by valve body 352 flows rapidly through scraper 51 into elongated tube 31 via vent 515. In this embodiment, as shown in fig. 6, the air vents 515 are circular holes, and 8 air vents 515 are uniformly distributed on the scraper 51. As will be appreciated by those skilled in the art, the shape or form of the opening of the vent 515 need only be such that the opening is capable of allowing airflow therethrough, and the particular shape or form may take other shapes or forms, such as: square openings, triangular openings, irregularly shaped openings, and the like. The specific number of the air vents 515 and the distribution pattern of the air vents in the scraping member 51 can be determined according to the desired air flow rate and/or the material of the absorbent member, and is not limited herein. In this embodiment, the opening of the vent 515 of the scraper 51 at least partially overlaps the opening of the vent 525 of the absorbent member 52 and/or the slits of the slit/slit 526, such that irrigation gas can flow into the elongate tube 31 via the vent 525 and then via the opening of the vent 515 and/or the slit/slit 526.

The absorbent member 52 absorbs fluid on itself by the nature of absorption or adsorption, wherein the fluid will diffuse into and become part of the space or structure of the absorbent material. The absorbent member 52 has an absorption saturation parameter, and when the upper limit of the absorption saturation of the absorbent member 52 is reached, the absorbent member 52 cannot function for absorption any more. Figure 8 depicts an exploded view of the cleaning assembly 5 and spacer 53 of another embodiment of the present invention. In this embodiment, the cleaning assembly 5 includes two absorbent members, a first absorbent member 52 and a second absorbent member 52', respectively. The specific construction of the first absorbent member 52 and the second absorbent member 52' is identical to the absorbent member construction described above and will not be described in detail herein. In this embodiment, the positioning member 53, the first absorbent member 52, the second absorbent member 52' and the scraping member 51 are fitted to the positioning posts 353 in this order from top to bottom. Preferably, the slits or slits 526 of the first absorbent member 52 are cross-layered with the slits or slits 526 ' of the second absorbent member 52 ', i.e., the slits or slits 526 are offset and not coincident with the slits or slits 526 '. As shown in fig. 8, the 4 slits or slits 526 of the first absorbent member 52 are angled 45 degrees from each other with respect to the 4 slits or slits 526 of the adjacent second absorbent member 52'. The slits or cracks of the absorption pieces are overlapped in a crossed mode, so that the friction force is uniformly distributed in the insertion or extraction movement process of the instrument, and the hand feeling of a doctor when operating the instrument is effectively improved. In this embodiment, the number of the absorbing members is two. In other embodiments, more than two absorbent members can be used to more effectively increase the capacity and capacity of the absorbent member to contain the absorbent material.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A cannula assembly for a puncture instrument comprising:

a housing including a working channel for passage of an instrument, the working channel having an aperture defined as a working aperture;

a gas injection port formed on the housing and communicating with the working channel, from which injected gas can be sent to the working channel;

a seal assembly disposed within the housing;

the method is characterized in that: the cannula assembly further includes a cleaning assembly disposed within the housing, the cleaning assembly including an absorbent member and a wiper member, the absorbent member and the wiper member each having a central aperture through which the instrument passes; the absorbent member may absorb and/or absorb fluid; the absorbent member being closer to the proximal end of the cannula assembly than the scraper member;

the absorbent member having at least two slits communicating with the central aperture of the absorbent member and extending in a radial direction;

the central aperture of the absorbent member is a first central aperture, the aperture of the first central aperture being defined as a first aperture diameter; the central hole of the scraping piece is a second central hole, and the aperture of the second central hole is defined as a second aperture; the first aperture is less than or equal to the second aperture, and the second aperture is less than or equal to the working aperture.

2. A block of bushings according to any of the claims 1, characterized in that: the at least two gaps are uniformly distributed.

3. A block of bushings according to any of the claims 1, characterized in that: the scraper has a vent through which the injected gas enters the working channel.

4. A block of bushings according to claim 3, characterized in that: the vent of the scraping member is at least partially disposed in overlapping relation with the aperture of the absorbent member.

5. A block of bushings according to claim 3, characterized in that: the absorbent member has a vent opening, and the vent opening of the scraping member and the vent opening of the absorbent member are at least partially disposed in overlapping relation.

6. A block of bushings according to any of the claims 1, characterized in that: the central aperture of the scraping element is tapered with a larger orifice diameter towards the absorbent element than the orifice diameter on the opposite side.

7. A block of bushings according to claim 1, characterized in that: the absorption piece is provided with a plurality of fine capillaries or the material texture adopted by the absorption piece has capillary action.

8. A block of bushings according to claim 1, characterized in that: the surface of the sealing component is coated with a coating made of water-repellent material, or the manufacturing material of the sealing component comprises the water-repellent material.

9. A block of bushings according to claim 8, characterized in that: the water-repellent material comprises the following materials: one or at least two of metal complex containing long chain fatty acid, organosilicon, fluorine-containing polymer and rubber material containing wax component.

10. A block of bushings according to any of claims 8, 9, characterized in that: the water repellent material is a nano material.

11. A block of bushings according to claim 1, characterized in that: the absorbent member comprises a first group of materials comprising: one or at least two of pulverized wood pulp fluff, cellulose fiber, polymeric gelling agent, hydrophilic nonwoven fabric, cellulose, sodium polyacrylate, cotton fabric, polyethylene terephthalate, polyethylene, polypropylene, polyvinyl chloride, ABS, polyamide, polystyrene, polyvinyl alcohol, polycarbonate, ethylene-methacrylate copolymer, polyacetal.

12. A block of bushings according to claim 11, characterized in that: the absorbent member comprises the following second group of materials: one or at least two of silica gel, alumina, zeolite, activated carbon, graphite, cellulose, porous polymer matrix, perlite, metal hydroxide, metal oxide/cellulose acetate, metal oxide/cellulose butyrate and metal oxide/cellulose nitrate, polyamide, polysulfone, vinyl polymer, polyester, polyolefin and PTFE, porous glass or glass ceramic, graphite oxide, polyelectrolyte complex, alginate gel.

13. A block of bushings according to claim 12, characterized in that: the absorbent member includes the first set of materials and/or the second set of materials.

14. A block of bushings according to claim 1, characterized in that: the thimble assembly includes a plurality of the absorbing piece, a plurality of the absorbing piece is range upon range of the setting, and a plurality of the gap cross of absorbing piece is range upon range of.

15. A block of bushings according to claim 1, characterized in that: the inner wall of the shell is provided with a plurality of positioning columns, and the cleaning assembly is fixed on the positioning columns through positioning pieces.

16. A puncture instrument comprising a cannula assembly according to any one of claims 1-15, wherein: the puncture outfit also comprises a puncture core rod, and the puncture core rod can penetrate through the sleeve assembly.