A detachable sleeve assembly and trocar

Abstract

The present invention relates to a detachable sleeve assembly, comprising a sleeve (110) and an outer cover (120), wherein the upper portion of the sleeve is provided with a first connecting portion, which cooperates with the second connecting portion of the lower portion of the outer cover; the lower portion of the first connecting portion is provided with a first positioning portion, which cooperates with the second positioning portion provided at the lower portion of the second connecting portion of the outer cover; the lower portion of the outer cover is elastic, and the first positioning portion and the second positioning portion in connection can be disengaged by pressing the lower portion of the outer cover. The present invention also provides a puncture device with a detachable sleeve assembly. The sleeve of the present invention can be detached from the outer cover, and the passage for taking objects becomes larger, so that the doctor can remove a larger volume of diseased tissue from the body of the operated subject, thereby speeding up the operation; the sleeve and the outer cover structure are provided with a device to prevent rotation, thereby avoiding the risk of dislocation and detachment of the sleeve and the outer cover during the operation, thereby making the operation safer and more effective.

Description

Technical Field

[0001] The invention belongs to the field of minimally invasive surgical instruments, in particular to a detachable sleeve assembly and a puncture device. Background Art

[0002] Disposable trocar products are mainly used in minimally invasive surgery and are mainly composed of two components: the cannula component and the blocker component. In the use of existing trocars, the cannula and the outer cover in the cannula component are fixedly connected together, so that when removing the diseased tissue during surgery, it is necessary to pass through the seal inside the outer cover to remove the diseased tissue. However, the channel aperture of the seal is small, which makes it extremely inconvenient to remove the object, and it will cause contamination of the seal, affecting subsequent surgery.

[0003] The inventor proposes the present invention after long-term research and practice. Summary of the invention

[0004] In order to overcome the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a detachable cannula assembly and a puncture device, in which the cannula and the outer cover in the cannula assembly are detachably connected, and the outer cover can be removed from the cannula during surgery, and the object does not need to pass through the seal in the outer cover; in addition, the detachable cannula assembly of the present invention can achieve the seal between the cannula and the outer cover only by relying on the seal between the component parts, so that the structure is simple and the assembly is convenient; the cannula and the outer cover after assembly are tightly combined, and are not prone to dislocation and detachment, and have high reliability.

[0005] The technical solution of the detachable sleeve assembly of the present invention is: a detachable sleeve assembly includes a sleeve and an outer cover, the upper part of the sleeve is provided with a first connecting part, which cooperates with the second connecting part of the lower part of the outer cover; the lower part of the first connecting part is provided with a first positioning part, which cooperates with the second positioning part provided at the lower part of the second connecting part of the outer cover; the lower part of the outer cover is elastic, and the first positioning part and the second positioning part in connection can be detached by pressing the lower part of the outer cover.

[0006] Furthermore, the first connecting part includes a cylindrical part and a conical cylindrical part which are connected to each other, the top of the cylindrical part is provided with an annular sleeve top surface, the outer circumference of the cylindrical part is provided with a sleeve thread, the sleeve top surface and the sleeve thread are respectively used to engage with the outer cover positioning ring and the outer cover thread at the lower part of the outer cover to form a double seal.

[0007] Furthermore, the inner side surface of the upper part of the cylindrical portion has a conical sleeve sealing surface, which matches with the outer cover sealing surface arranged on the inner wall surface of the lower part of the outer cover.

[0008] Optionally, a sealing ring is provided on the outer cover positioning ring to form a reinforced double seal.

[0009] Further, the first positioning portion includes a circular plate and a limit block arranged on the circular plate, the limit block includes a first limit surface and a first sliding surface adjacent to the circular plate; the second positioning portion includes a stop block, the stop block has a second limit surface and a second sliding surface adjacent to the circular plate, and the rotation radius of the second sliding surface is smaller than the rotation radius of the first sliding surface.

[0010] Furthermore, there are two limit blocks, which are symmetrically arranged on the circular plate; there are also two corresponding stop blocks at the lower part of the outer cover; and two pressing blocks suitable for finger pressing are arranged in the middle of the two stop blocks at the lower part of the outer cover.

[0011] Optionally, the first positioning portion includes a circular plate and a limit block arranged on the circular plate, the limit block includes a first limit surface and a third sliding surface adjacent to the circular plate; the second positioning portion includes a pressing block, the pressing block has a third limit surface and a fourth sliding surface adjacent to the circular plate, and the rotation radius of the fourth sliding surface is greater than the rotation radius of the third sliding surface.

[0012] Optionally, the first positioning portion includes a positioning groove / block provided on the cylindrical portion or the conical cylindrical portion, and the second positioning portion includes a block / positioning groove provided at the lower portion of the outer cover, and the block can engage with the positioning groove.

[0013] The present invention also provides a puncture device with a detachable sleeve assembly, which comprises a blocking rod and a sleeve assembly, and the sleeve assembly is the aforementioned detachable sleeve assembly.

[0014] The advantages of the present invention are as follows.

[0015] 1. The cannula can be detached from the outer cover, and the passage for taking out objects becomes larger, so that the doctor can take out larger diseased tissues from the body of the operated object, thus speeding up the operation.

[0016] 2. The sleeve and outer cover structure has a device to prevent rotation, which avoids the risk of dislocation and detachment of the sleeve and outer cover during the operation, making the operation safer and more effective.

[0017] 3. The casing and the outer cover are sealed by the structure, which is simple and saves materials.

[0018] 4. Different types of trocars can be obtained by simply replacing sleeves of different sizes and specifications, which can greatly save production costs while meeting different market demands. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure explosion of an embodiment of the detachable sleeve assembly of the present invention.

[0020] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of the detachable sleeve assembly of the present invention.

[0021] Figure 3 yes Figure 1 A schematic diagram of the sleeve structure of the detachable sleeve assembly is shown.

[0022] Figure 4 yes Figure 1 A schematic diagram of the outer cover structure of the detachable sleeve assembly is shown.

[0023] Figure 5 yes Figure 3 and Figure 4 Schematic diagram of the assembly of the detachable sleeve assembly shown.

[0024] Figure 6 It is a schematic structural explosion diagram of another embodiment of the detachable sleeve assembly of the present invention.

[0025] Figure 7 It is a structural schematic diagram of another embodiment of the detachable sleeve assembly of the present invention.

[0026] Figure 8 yes Figure 7 Exploded view of the structure shown.

[0027] Fig. 9 It is a structural schematic diagram of another embodiment of the detachable sleeve assembly of the present invention.

[0028] Fig.10 yes Fig. 9 Exploded view of the structure shown.

[0029] Fig.11 It is a schematic structural explosion diagram of an embodiment of a puncture device with a detachable sleeve assembly of the present invention.

[0030] Among them, 100-sleeve assembly, 110-sleeve, 111-sleeve thread, 112-circular plate, 113-limiting block, 113a-first limiting surface, 113b-first sliding surface, 113c-third sliding surface, 114-sleeve top surface, 115-sleeve sealing surface, 116-block, 120-outer cover, 121-outer cover thread, 122-pressing block, 123-stopper, 123 a-second limiting surface, 123b-second sliding surface, 124-outer cover positioning ring, 125-outer cover sealing surface, 126-outer cover sealing support column, 127-pressing block, 127a-third limiting surface, 127b-fourth sliding surface, 128-positioning groove, 130-sealing ring, 140-stopcock, 150-sealing cover, 160-O-ring, 170-duckbill, 200-blocking rod. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-11, a detachable sleeve assembly and a trocar having the detachable sleeve assembly of the present invention are further described. It should be noted that the following embodiments can only be used to explain the technical solution of the present invention and cannot be interpreted as limiting the present invention.

[0032] like Figure 1-5 As shown, a detachable sleeve assembly 100 of the present invention includes a sleeve 110 and an outer cover 120. The upper part of the sleeve 110 is provided with a first connection part, which cooperates with the second connection part of the lower part of the outer cover 120; the lower part of the first connection part is provided with a first positioning part, which cooperates with the second positioning part provided at the lower part of the second connection part of the outer cover 120; the lower part of the outer cover 120 is elastic, and the first positioning part and the second positioning part in connection can be disengaged by pressing the lower part of the outer cover 120. Only after the first positioning part and the second positioning part are disengaged, the connection between the first connection part and the second connection part can be released, and the sleeve 110 and the outer cover 120 can be separated.

[0033] like Figure 1-3 As shown, the first connecting portion includes a cylindrical portion and a conical cylindrical portion which are connected to each other. The top of the cylindrical portion is provided with an annular sleeve top surface 114, and the outer circumference of the cylindrical portion is provided with a sleeve thread 111. The sleeve top surface 114 and the sleeve thread 111 are respectively used to engage with the outer cover positioning ring 124 and the outer cover thread 121 at the lower part of the outer cover 120 to form a double seal.

[0034] The conical cylinder part is connected to the lower part of the sleeve, and plays the role of transitionally connecting the lower part of the sleeve and the cylindrical part. The conical cylinder part can be connected to a variety of sleeves with different radii. In actual production, different types of trocars can be obtained by simply replacing sleeves of different sizes, thereby reflecting the superior economic efficiency of the present invention.

[0035] The cylindrical part is arranged on the conical part, and its shape and structure are conducive to the connection and sealing of the sleeve 110 and the outer cover 120. The top of the cylindrical part is an annular sleeve top surface 114, which is used to match with the outer cover positioning ring 124 arranged on the lower inner wall of the outer cover 120; the upper inner side surface of the cylindrical part is a conical sleeve sealing surface 115, which is used to match with the outer cover sealing surface 125 arranged on the lower inner wall of the outer cover 120; the annular sleeve top surface 114 is adjacent to the sleeve sealing surface 115; the sleeve thread 111 is arranged on the outer surface of the cylindrical part, which is used to match with the outer cover thread 121 arranged on the lower inner wall of the outer cover 120.

[0036] Correspondingly, the lower inner wall of the outer cover 120 is provided with a shape and structure corresponding to the first connecting portion of the sleeve 110, such as Figure 2As shown, the cover thread 121 and the sealing ring are arranged from bottom to top on the inner wall of the lower part of the cover 120, the sealing ring is provided with a cover positioning ring 124, and the sealing ring extends downward to form a conical cover sealing surface 125, the cover thread 121 is used to match with the sleeve thread 111, the cover positioning ring 124 is used to match with the sleeve top surface 114, and the cover sealing surface 125 is used to match with the sleeve sealing surface 115, which form a triple seal to avoid air leakage during the operation of the puncture device. In order to enhance the stability of these multiple seals, a hollow cover sealing support column 126 is also extended upward from the sealing ring of the cover 120.

[0037] The first positioning portion includes a circular plate 112 and a limiting block 113 disposed on the circular plate 112. The limiting block 113 includes a first limiting surface 113a and a first sliding surface 113b adjacent thereto (see Figure 3 , which is the surface with the largest turning radius in the limit block 113); the second positioning portion includes a stopper 123, and the stopper 123 includes a second limit surface 123a and a second sliding surface 123b adjacent thereto (see Figure 4 ), the rotation radius of the second sliding surface 123b is smaller than the rotation radius of the first sliding surface 113b, so that under normal cooperation, that is, when the first limiting surface 113a and the second limiting surface 123a are close to each other, the second sliding surface 123b cannot pass over the first sliding surface 113b, thereby achieving the fastening and locking between the sleeve 110 and the outer cover 120.

[0038] During the assembly of the sleeve assembly, the sleeve 110 and the outer cover 120 rotate relative to each other. Since the lower part of the outer cover 120 is elastic, when the second sliding surface 123b initially contacts the first sliding surface 113b, an elastic force is generated between the second sliding surface 123b and the first sliding surface 113b, the lower part of the outer cover 120 is deformed by the force, and the rotation radius of the second sliding surface 123b is expanded to be the same as the rotation radius of the first sliding surface 113b; the sleeve 110 and the outer cover 120 continue to rotate relative to each other until the second sliding surface 123b completely slides over the first sliding surface 113b, at which time the elastic force between the two disappears, the lower part of the outer cover 120 returns to its original shape, the rotation radius of the second sliding surface 123b is smaller than the rotation radius of the first sliding surface 113b, the first limiting surface 113a and the second limiting surface 123a come into contact, and the first limiting surface 113a and the second limiting surface 123a limit the reverse relative rotation of the sleeve 110 and the outer cover 120, thereby achieving the relative positioning of the two.

[0039] If the sleeve 110 and the outer cover 120 need to rotate in the opposite direction relative to each other, the first limit surface 113a and the second limit surface 123a need to be disengaged. The lower part of the outer cover 120 can be pinched with fingers to deform the lower part of the outer cover 120, so that the first limit surface 32a and the second limit surface 22a can be disengaged. At this time, the turning radius of the second sliding surface 123b is greater than the turning radius of the first sliding surface 113b. The sleeve 110 and the outer cover 120 can be separated by relatively rotating the sleeve 110 and the outer cover 120.

[0040] In one embodiment, there are two limit blocks 113, which are symmetrically arranged on the circular plate 112; there are also two corresponding stop blocks 123 at the lower part of the outer cover 120; and two pressing blocks 122 suitable for finger pressing are arranged in the middle of the two stop blocks 123 at the lower part of the outer cover 120. The user can press the two pressing blocks 122 with the thumb and other fingers of one hand respectively to separate the first limit surface 113a and the second limit surface 123a, and then relatively rotate the sleeve 110 and the outer cover 120 to loosen the threaded connection between the sleeve 110 and the outer cover 120, thereby separating 110 from the outer cover 120.

[0041] like Figure 6 As shown, in a preferred embodiment, a sealing ring is further provided between the sleeve top surface 114 of the sleeve 110 and the outer cover positioning ring 124 of the outer cover 120, so as to obtain an enhanced sealing effect.

[0042] In an optional embodiment, the first positioning portion includes a positioning groove / block provided on the cylindrical portion or the conical cylindrical portion, and the second positioning portion includes a block / positioning groove provided at the lower portion of the outer cover, and the block can engage with the positioning groove. Figure 7 and Figure 8 As shown, a protruding block 116 is provided on the cylindrical portion and the conical portion of the sleeve 110, and a concave positioning groove 128 is provided at the lower portion of the outer cover 120 for shape matching with the block 116. Similarly, the block can also be provided on the outer cover 120, and the positioning groove can be provided on the cylindrical portion or the conical portion of the sleeve 110 accordingly.

[0043] like Fig. 9 and Fig.10As shown, in a preferred embodiment, the first positioning portion includes a circular plate 112 and a limit block 113 arranged on the circular plate 112, the limit block includes a first limit surface 113a and a third sliding surface 113c adjacent to it (the surface with the smallest rotation radius in the limit block 113); the second positioning portion includes a pressing block 127, the pressing block 127 has a third limit surface 127a and a fourth sliding surface 127b adjacent to it, and the rotation radius of the fourth sliding surface 127b is greater than the rotation radius of the third sliding surface 113c. The user can press the pressing block 127 with the thumb and other fingers of one hand respectively, so that the pressing block 127 or the lower part of the outer cover 120 near it is deformed, and the rotation radius of the outer surface of the pressing block 127, i.e., the fourth sliding surface 127b, becomes smaller than the rotation radius of the inner surface of the limit block, i.e., the third sliding surface 113c. Then, the sleeve 110 and the outer cover 120 are relatively rotated to loosen the threaded connection between the sleeve 110 and the outer cover 120, thereby realizing the separation of the sleeve 110 and the outer cover 120.

[0044] like Fig.11 As shown, a puncture device with a detachable sleeve assembly of the present invention is composed of a blocking rod 200 and a sleeve assembly 100; wherein the sleeve assembly 100 includes a sleeve 110, an outer cover 120, a stopcock 140, a sealing cover 150, an O-ring 160 and a duckbill 170, and the combination of the outer cover 120 and the stopcock 140, the sealing cover 150, the O-ring 160 and the duckbill 170 is the same as the combination in the prior art, which will not be repeated here.

[0045] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solution of the present invention should be included in the scope of protection of the present invention.

Claims

1. A detachable sleeve assembly, comprising a sleeve (110) and an outer cover (120), characterized in that: The upper part of the sleeve (110) is provided with a first connecting portion, which cooperates with the second connecting portion of the lower part of the outer cover (120); the lower part of the first connecting portion is provided with a first positioning portion, which cooperates with the second positioning portion provided at the lower part of the second connecting portion of the outer cover (120); the lower part of the outer cover (120) is elastic, and the first positioning portion and the second positioning portion in connection can be separated by pressing the lower part of the outer cover (120); The first connecting portion comprises a cylindrical portion and a conical cylindrical portion connected to each other, the top of the cylindrical portion is provided with an annular sleeve top surface (114), the outer circumference of the cylindrical portion is provided with a sleeve thread (111), the sleeve top surface (114) and the sleeve thread (111) are respectively used to engage with an outer cover positioning ring (124) and the outer cover thread (121) at the lower part of the outer cover (120) to form a double seal; A sealing ring (130) is arranged on the outer cover positioning ring (124), thereby forming a reinforced double seal; The inner side surface of the upper part of the cylindrical part has a conical sleeve sealing surface (115), which matches with the outer cover sealing surface (125) provided on the inner wall surface of the lower part of the outer cover (120).

2. The detachable sleeve assembly according to claim 1, characterized in that: The first positioning portion comprises a circular plate (112) and a limiting block (113) arranged on the circular plate (112), wherein the limiting block (113) comprises a first limiting surface (113a) and a first sliding surface (113b) adjacent thereto; the second positioning portion comprises a stopper (123), wherein the stopper (123) has a second limiting surface (123a) and a second sliding surface (123b) adjacent thereto, and a gyration radius of the second sliding surface (123b) is smaller than a gyration radius of the first sliding surface (113b).

3. The detachable sleeve assembly according to claim 2, characterized in that: There are two limit blocks (113) symmetrically arranged on the circular plate (112); there are also two corresponding stop blocks (123) at the lower part of the outer cover (120); and two pressing blocks (122) suitable for finger pressing are arranged in the middle of the two stop blocks (123) at the lower part of the outer cover (120).

4. The detachable sleeve assembly according to claim 1, characterized in that: The first positioning portion comprises a circular plate (112) and a limiting block (113) arranged on the circular plate (112), wherein the limiting block (113) comprises a first limiting surface (113a) and a third sliding surface (113c) adjacent thereto; the second positioning portion comprises a pressing block (127), wherein the pressing block (127) has a third limiting surface (127a) and a fourth sliding surface (127b) adjacent thereto, and a turning radius of the fourth sliding surface (127b) is greater than a turning radius of the third sliding surface (113c).

5. The detachable sleeve assembly according to claim 1, wherein: The first positioning portion comprises a positioning groove / block arranged on the cylindrical portion or the conical cylindrical portion, and the second positioning portion comprises a block / positioning groove arranged at the lower part of the outer cover (120), and the block can be engaged with the positioning groove.

6. A trocar with a detachable cannula assembly, comprising a blocking rod (200) and a cannula assembly (100), characterized in that: The sleeve assembly (100) is a detachable sleeve assembly according to any one of claims 1 to 5.

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