A puncture cannula

Abstract

The present invention relates to a puncture cannula, comprising a cannula body and a sealing head fixed at the upper end of the cannula body, the sealing head comprising a cylindrical shell, an inflation valve, a one-way sealing valve and a detachable conversion cap, the inflation valve being fixed at the outer side of the cylindrical shell; the one-way sealing valve being installed between the cylindrical shell and the cannula body; the detachable conversion cap being installed at the end of the cylindrical shell. The above-mentioned puncture cannula can expand the range of rod diameters passing through the instrument by using detachable conversion caps of different specifications in cooperation with the cannula body; the one-way sealing valve cooperates with the elastic sealing sleeve in the detachable conversion cap, and has a simple structure and good sealing effect. The one-way sealing valve has self-sealing performance under the action of external pressure, further improving the overall sealing performance of the puncture cannula.

Description

Technical Field

[0001] The invention relates to the field of medical devices, in particular to a puncture cannula. Background Art

[0002] With the development of medical technology, medical trocars are used more and more widely. They are suitable for minimally invasive surgeries in the abdomen, chest and obstetrics and gynecology. They provide a channel for the entry of endoscopic instruments and can provide CO2 gas during surgery.

[0003] In minimally invasive human medical surgery, once a disease is found in the human body, surgery or resection is required. During the operation, the first thing to be used is a trocar. The trocar is a surgical instrument that pierces the abdominal wall and allows other surgical instruments to enter the body cavity. It is a minimally invasive surgical instrument. The trocar usually includes a sleeve assembly as a channel for other surgical instruments to enter and a puncture rod that runs through the sleeve assembly. First, in order to penetrate the skin, the skin epidermis is cut with a scalpel, and then the puncture rod is used to penetrate the skin and enter the body cavity together with the sleeve assembly. Then the puncture rod is pulled out, and the sleeve assembly can be used as a channel for introducing various instruments and tools into the abdominal cavity and providing a channel for the abdominal wall of the gas filling chamber to rise above the organs. In order to prevent gas leakage in the abdominal cavity when various instruments and tools are inserted into the abdominal cavity during the operation, a sealing assembly needs to be set in the sleeve assembly. Common sealing assemblies generally include a mounting seat, on which a number of woven distribution or circumferentially staggered superimposed sealing pads are provided. When used, the instrument passes through the center of the sealing assembly composed of multiple sealing pads, thereby achieving a sealing effect. However, the sealing component of the existing trocar puncture sleeve has a poor sealing effect and poor adaptability to surgical instruments of different sizes. It cannot achieve a good balance between the overall airtightness and the ease of passing the surgical instruments. For smaller surgical instruments, it is easy to leak, and for larger surgical instruments, it will generate a large instrument pulling force, and even cause the trocar to fall off the abdominal wall as a whole, resulting in loss of abdominal pressure, affecting the progress of the operation.

[0004] However, the existing laparoscopic puncture devices on the domestic market have very complex sleeve structures to meet the requirements of sealing and effective passage of instruments. For example, the "Sealing Device for Disposable Puncture Device" disclosed in Chinese Patent CN201620105103 and the "A Puncture Device" disclosed in Chinese Patent CN201610850381 have high production costs and a narrow scope of application. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a puncture cannula, which can expand the diameter range of the instrument by using a detachable conversion cap; the one-way sealing valve cooperates with the elastic sealing sleeve in the detachable conversion cap, has a simple structure and good sealing effect.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a puncture cannula, comprising a cannula body and a head fixed to the upper end of the cannula body, the head comprising a cylindrical shell, an inflation valve, a one-way sealing valve and a detachable conversion cap, the inflation valve is fixed to the outside of the cylindrical shell; the one-way sealing valve is installed between the cylindrical shell and the cannula body; the detachable conversion cap is installed at the end of the cylindrical shell.

[0007] The detachable conversion cap includes a cap body, a cap cover, an elastic sealing sleeve, a pressing sleeve ring and a supporting ring, wherein the supporting ring is fixed on the inner wall of the cap body; the elastic sealing sleeve is installed on the supporting ring; the pressing sleeve ring is screwed on the inner wall of the cap body through a thread, and the pressing sleeve ring is tightly pressed on the one-way sealing valve; the cap cover is pressed on the elastic sealing sleeve; and a hole is opened in the middle of the elastic sealing sleeve.

[0008] The cap is a hollow structure, and an external thread is arranged on the outer side thereof, and the external thread is a sealing pipe thread.

[0009] The cylindrical shell and the supporting ring are both provided with sealing grooves.

[0010] The one-way sealing valve is semi-spiral with an open upper end, with a total length of not less than 10 mm, and a circular support ring and a positioning protrusion are provided at its upper end. The positioning protrusion is located on the lower side of the circular support ring, and its outer diameter is larger than the outer diameter of the circular support ring; two parallel diaphragms connected end to end are provided at the inner lower end of the circular support ring, and the cross-section of the hollow channel formed by the diaphragm gradually decreases in a spiral shape from top to bottom; the thickness of the diaphragm is 2 mm to 3 mm.

[0011] The lower end opening of the one-way sealing valve is egg-shaped.

[0012] A fixed external thread is arranged on the outer side surface of the lower half of the sleeve body, and the cross section of the fixed external thread is semicircular.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0014] The use of different specifications of detachable conversion caps and sleeve bodies can expand the range of rod diameters that can pass through the instrument; the one-way sealing valve cooperates with the elastic sealing sleeve in the detachable conversion cap, with a simple structure and good sealing effect. The one-way sealing valve has self-sealing performance under the action of external pressure, further improving the overall sealing performance of the puncture sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0016] Attached Figure 1 This is a schematic diagram of the new appearance structure of the present invention;

[0017] Attached Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0018] Attached Figure 3 It is a schematic diagram of the one-way sealing valve structure of the present invention;

[0019] Attached Figure 4 It is a schematic cross-sectional structural diagram of the one-way sealing valve of the present invention;

[0020] Attached Figure 5 It is a schematic diagram of the cross-sectional structure of a cylindrical shell of the present invention;

[0021] Attached Figure 6 It is a schematic cross-sectional structure diagram of the detachable conversion cap of the present invention.

[0022] In the figure: 1. Removable conversion cap; 1-1. Cap cover; 1-2. Cap body; 1-2-1. Support ring; 1-2-2. Sealing groove A; 1-2-3. Internal sealing pipe thread; 1-3. Elastic sealing sleeve; 2. Cylindrical shell; 2-1. Sealing groove B; 3. Sleeve body; 4. Fixed external thread; 5. Inflatable valve; 6. One-way sealing valve; 6-1. Hollow channel; 6-2. Positioning protrusion; 6-3. Round support ring; 7. Pressing ring. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 6 The puncture cannula shown comprises a cannula body 1 and a sealing head fixed on the upper end of the cannula body 1. The lower end surfaces of the cannula body 1 and the sealing head, i.e., the lower end surface of the cylindrical shell 2, are connected by injection molding to ensure sealing performance.

[0025] The head includes a cylindrical shell 2, an inflation valve 5, a one-way sealing valve 6 and a detachable conversion cap 1. The inflation valve 5 is directly a purchased part. It can be connected to the inflation tube for inflation, and can also be deflated after the inflation tube is removed. Its model is XN-033 produced by the Southwest Precision Switch Screw Factory in Yuyao City.

[0026] The inflation valve 5 is fixed on the outside of the cylindrical shell 2 ; the one-way sealing valve 6 is installed between the cylindrical shell 2 and the sleeve body 3 ; and the detachable conversion cap 1 is installed at the end of the cylindrical shell 2 .

[0027] The one-way sealing valve 6 has a self-sealing property. When gas enters the cylindrical housing 2 through the inflation valve 5, the lower end opening of the one-way sealing valve 6 is automatically closed under the action of gas pressure. When an instrument passes through the one-way sealing valve 6, the diaphragm of the one-way sealing valve 6 is tightly attached to the outer wall of the instrument under the action of gas pressure to prevent gas from overflowing.

[0028] When the instrument enters the one-way sealing valve 6, since the diaphragm of the one-way sealing valve 6 is made of elastic soft material, the smooth front end structure of the instrument can pass through very conveniently while ensuring air tightness.

[0029] The diaphragm of the one-way sealing valve 6 is made of rubber.

[0030] The detachable conversion cap 1 includes a cap body 1-2, a cap cover 1-1, an elastic sealing sleeve 1-3, a pressing ring 7 and a supporting ring 1-2-1, wherein the supporting ring 1-2-1 is fixed on the inner wall of the cap body 1-2; the elastic sealing sleeve 1-3 is installed on the supporting ring 1-2-1; the pressing ring 7 is screwed on the inner wall of the cap body 1-2 through threads, and the pressing ring 7 is tightly pressed on the one-way sealing valve 6; the cap cover 1-1 is pressed on the elastic sealing sleeve 1-3; and the elastic sealing sleeve 1-3 has a hole in the middle.

[0031] The cap 1-1 is a hollow structure, and an external thread is provided on its outer side. The external thread is a sealing pipe thread, which matches the internal sealing pipe thread 1-2-3 to enhance the sealing performance.

[0032] The elastic sealing sleeve 1-3 can be provided with several layers as needed to enhance the sealing performance. The elastic sealing sleeve 1-3 is made of rubber, and the middle opening is convenient for the instrument to pass through. Due to the different specifications (diameters) of the instruments, the aperture of the middle opening of the elastic sealing sleeve 1-3 also needs to be changed. The use of multiple layers of elastic sealing sleeves 1-3 with different middle apertures can effectively expand the range of rod diameters through which the instrument can pass, improve surgical efficiency, and reduce the cost of use.

[0033] Sealing grooves are provided on the cylindrical shell 2 and the support ring 1-2-1, wherein the sealing groove 1-2-2 is provided on the support ring 1-2-1, which matches with the protrusion on the elastic sealing sleeve 1-3 to facilitate the installation of the elastic sealing sleeve 1-3.

[0034] The sealing groove 2 - 1 on the cylindrical housing 2 is matched with the positioning protrusion 6 - 2 on the one-way sealing valve 6 , so as to facilitate the installation and sealing of the one-way sealing valve 6 .

[0035] The one-way sealing valve 6 is semi-spiral with an open upper end, and its total length is not less than 10 mm. A circular support ring 6-3 and a positioning protrusion 6-2 are provided at its upper end. The positioning protrusion 6-2 is located on the lower side of the circular support ring 6-3, and its outer diameter is larger than the outer diameter of the circular support ring 6-3; two parallel diaphragms connected end to end are provided at the inner lower end of the circular support ring 6-3, and the cross-section of the hollow channel 6-1 formed by the diaphragm gradually decreases from top to bottom in a spiral shape; the thickness of the diaphragm is 2 mm to 3 mm.

[0036] The lower end opening of the one-way sealing valve 6 is egg-shaped and is open in a non-working state.

[0037] A fixed external thread 4 is provided on the outer side surface of the lower half of the sleeve body 3. The cross section of the fixed external thread 4 is semicircular to enhance the connection strength with human tissue.

[0038] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A puncture cannula, characterized in that: It comprises a sleeve body and a sealing head fixed on the upper end of the sleeve body, the sealing head comprises a cylindrical shell, an inflation valve, a one-way sealing valve and a detachable conversion cap, the inflation valve is fixed on the outside of the cylindrical shell; the one-way sealing valve is installed between the cylindrical shell and the sleeve body; the detachable conversion cap is installed at the end of the cylindrical shell; The detachable conversion cap comprises a cap body, a cap cover, an elastic sealing sleeve, a pressing sleeve ring and a supporting ring, wherein the supporting ring is fixed on the inner wall of the cap body; the elastic sealing sleeve is installed on the supporting ring; the pressing sleeve ring is screwed on the inner wall of the cap body through a thread, and the pressing sleeve ring is tightly pressed on the one-way sealing valve; the cap cover is pressed on the elastic sealing sleeve; and the elastic sealing sleeve has a hole in the middle; The one-way sealing valve is semi-spiral with an open upper end, with a total length of not less than 10 mm, and a circular support ring and a positioning protrusion are provided at its upper end. The positioning protrusion is located on the lower side of the circular support ring, and its outer diameter is larger than the outer diameter of the circular support ring; two parallel diaphragms connected end to end are provided at the inner lower end of the circular support ring, and the cross-section of the hollow channel formed by the diaphragm gradually decreases in a spiral shape from top to bottom; the thickness of the diaphragm is 2 mm to 3 mm.

2. The puncture cannula according to claim 1, characterized in that: The cap is a hollow structure, and an external thread is arranged on the outer side thereof, and the external thread is a sealing pipe thread.

3. The puncture cannula according to claim 1, characterized in that: The cylindrical shell and the supporting ring are both provided with sealing grooves.

4. The puncture cannula according to claim 1, characterized in that: The lower end opening of the one-way sealing valve is egg-shaped.

5. The puncture cannula according to claim 1, characterized in that: A fixed external thread is arranged on the outer side surface of the lower half of the sleeve body, and the cross section of the fixed external thread is semicircular.

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