Ultrasonic knife device with telescopic knife bar

Abstract

The ultrasonic scalpel device comprises a base, an instrument rod, an inner rod, a scalpel head, the scalpel rod, a scalpel head transmission mechanism and a scalpel rod transmission mechanism. The instrument rod is of a hollow structure, one end of the instrument rod is located in the base, the inner rod is movably arranged in the instrument rod and is of a hollow structure, and the cutter rod is movably arranged in the inner rod; the tool bit transmission mechanism is connected with the inner rod and can drive the tool bit to be opened and closed through the inner rod. The tool bar transmission mechanism is used for driving the tool bar to stretch out and draw back in the axial direction. The cutter bar transmission mechanism comprises a cutter bar gear assembly and a cutter bar lead screw, the cutter bar lead screw is fixedly connected with the cutter bar, the cutter bar gear assembly can drive the cutter bar lead screw to axially move, the cutter bar lead screw axially moves to drive the cutter bar to axially move, the cutter bar gear assembly is arranged in the base, and the input end of the cutter bar gear assembly is connected with the first input part. The first input part is fixed in the base and is suitable for being externally connected with a driving device; the ultrasonic knife device is beneficial to operation, tissue damage can be reduced, and operation time can be shortened.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to an ultrasonic knife device with a retractable knife rod. Background Art

[0002] Ultrasonic scalpel, also known as ultrasonic cutting hemostatic scalpel, works by converting electrical energy into high-frequency vibration mechanical energy through the piezoelectric ceramics in the transducer. The high-frequency mechanical vibration of the scalpel acts on the tissue to coagulate the protein in the tissue, thereby achieving the effect of stripping the tissue and closing the blood vessels. Compared with traditional electric scalpels, ultrasonic scalpels cause less damage to tissues, so they are increasingly used in clinical practice.

[0003] In the prior art, the blade rod of the ultrasonic scalpel is fixed relative to the entire instrument, which limits its flexibility to some extent and is not conducive to surgical operations. Summary of the invention

[0004] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0005] An ultrasonic knife device with a retractable knife rod comprises: a base, an instrument rod, an inner rod, a knife head, a knife rod, a knife head transmission mechanism, and a knife rod transmission mechanism; the instrument rod is a hollow structure, one end of the instrument rod is located in the base, the inner rod is movably arranged in the instrument rod, the inner rod is a hollow structure, and the knife rod is movably arranged in the inner rod; the knife head transmission mechanism is connected to the inner rod and can drive the knife head to open and close through the inner rod, and the knife rod transmission mechanism is used to drive the knife rod to axially retract and retract; the knife rod transmission mechanism comprises a knife rod gear assembly and a knife rod screw, the knife rod screw is fixedly connected to the knife rod, the knife rod gear assembly can drive the knife rod screw to move axially, and the axial movement of the knife rod screw drives the knife rod to move axially, the knife rod gear assembly is arranged in the base and the input end of the knife rod gear assembly is connected to the first input part, the first input part is fixed in the base and is suitable for an external drive device.

[0006] Furthermore, the cutter head transmission mechanism includes a cutter head gear assembly and a cutter head screw. The cutter head gear assembly can drive the cutter head screw to move axially. The cutter head gear assembly is arranged in the base and the input end of the cutter head gear assembly is connected to the second input part. The second input part is fixed in the base and is suitable for an external driving device; the cutter head gear assembly includes a cutter head driving gear and a cutter head passive gear meshing with the cutter head driving gear. The cutter head driving gear is connected to the second input part. An internal threaded hole is provided in the middle of the cutter head passive gear, and the thread of the internal threaded hole cooperates with the cutter head screw.

[0007] Furthermore, the top end of the cutter head screw is inserted into one end of the inner rod for fixation. When the cutter head screw moves axially, it drives the inner rod to move axially up and down. Two cutter head rotating shafts are provided on the cutter head, and the two cutter head rotating shafts are respectively installed in two circular holes correspondingly arranged on the circumference of the other end of the inner rod; a rotating pin is also provided, and the rotating pin passes through two rotating pin holes correspondingly arranged on the circumference of one end of the instrument rod and a cutter head through hole correspondingly arranged on the cutter head, and the cutter head can rotate around the rotating pin.

[0008] Furthermore, the tool rod gear assembly includes a tool rod driving gear, a tool rod intermediate gear and a tool rod passive gear. The tool rod driving gear is meshed with the tool rod intermediate gear, the tool rod intermediate gear is meshed with the tool rod passive gear, and the tool rod driving gear is installed in cooperation with the first input part; the tool rod passive gear is provided with an internal threaded hole, and the thread of the internal threaded hole is matched with the tool rod lead screw; the rotation of the tool rod driving gear drives the rotation of the tool rod intermediate gear, and the rotation of the tool rod intermediate gear drives the rotation of the tool rod passive gear, and the rotation of the tool rod passive gear drives the axial movement of the tool rod lead screw through the thread. When the tool rod lead screw moves axially, it synchronously drives the tool rod to axially extend and retract.

[0009] Furthermore, the ultrasonic knife device also includes a rotating assembly, which can drive the instrument rod, the inner rod and the knife rod to rotate.

[0010] Furthermore, the rotating assembly includes a rotating active gear and a rotating passive gear meshing with the rotating active gear. The rotating passive gear is a hollow structure. One end of the instrument rod is inserted into the hollow structure of the rotating passive gear. The rotating passive gear is provided with two rotating passive gear holes arranged opposite to each other along the circumference. The instrument rod is provided with two instrument rod holes arranged opposite to each other along the circumference. The inner rod waist-shaped hole and the knife rod waist-shaped hole are respectively provided at corresponding positions of the inner rod and the knife rod. The connecting pin passes through the two rotating passive gear holes, the two instrument rod holes, the inner rod waist-shaped hole, and the knife rod waist-shaped hole.

[0011] Furthermore, the rotating driving gear is installed in cooperation with the third input part, and the third input part is fixed in the base 10 and is suitable for an external driving device.

[0012] Furthermore, the first input part is a tool rod chuck, the second input part is a tool head chuck, and the third input part is a rotary chuck.

[0013] Furthermore, a middle-layer bracket is provided in the base, and a cutter head chuck bearing is provided in both the base and the middle-layer bracket, and the cutter head chuck is fixed through the bearing.

[0014] Furthermore, the tool rod driving gear passes through the base and the middle-layer bracket and is limited by a first retaining ring, and the tool head chuck passes through the base and the middle-layer bracket and is limited by a second retaining ring.

[0015] The blade rod of the ultrasonic knife device of the present invention is retractable. When the blade rod is extended, it is used only as a cutting knife. When the blade rod is retracted, it is used as a grasping forceps and a cutting knife. The blade rod can be extended forward for a certain distance, so that the blade head is far away from the tissue in a narrow operating space, and the blade head does not occupy the visual field space, and the high-frequency mechanical vibration of the blade rod is used to cut the tissue.

[0016] After adopting such a design, the present invention has at least the following advantages:

[0017] 1. The blade rod of the ultrasonic scalpel device of the present invention is retractable and has better flexibility, which is beneficial to surgical operation, reduces tissue damage, and shortens the operation time.

[0018] 2. The ultrasonic scalpel part of the ultrasonic scalpel device of the present invention can rotate as a whole, which is convenient for surgical operation.

[0019] 3. The cutter head transmission mechanism, the cutter rod transmission mechanism and the rotating assembly of the present invention can be operated independently without affecting each other.

[0020] 4. The present invention has a simple structure, good effect, low cost and easy process implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 It is a schematic diagram of the overall structure of the ultrasonic knife device of the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the blade end of the ultrasonic knife device of the present invention;

[0024] Figure 3 This is a schematic diagram of the cooperation between the blade head and the blade head rotating shaft of the ultrasonic blade device of the present invention;

[0025] Figure 4 Schematic diagram of the internal structure of the ultrasonic knife device base of the present invention

[0026] Figure 5 It is a cross-sectional schematic diagram of the base of the ultrasonic knife device of the present invention;

[0027] Figure 6 It is a schematic diagram of the matching structure of the connecting pin of the ultrasonic knife device of the present invention, the rotating passive gear, the instrument rod, the inner rod, and the knife rod;

[0028] Figure 7 This is a schematic diagram of the structure of the rotating driving gear of the ultrasonic knife device of the present invention;

[0029] Figure 8 This is a schematic diagram of the ultrasonic knife device of the present invention in a state where the knife rod is not extended;

[0030] Fig. 9 It is a schematic diagram of the extended state of the blade rod of the ultrasonic blade device of the present invention.

[0031] 1. Reference numerals in the accompanying drawings: 10. base; 11. middle bracket; 20. instrument rod; 21. inner rod; 211. inner rod waist hole; 311. cutter head active gear; 312. cutter head passive gear; 32. cutter head screw; 33. cutter head chuck; 411. cutter rod active gear; 412. cutter rod intermediate gear; 413. cutter rod passive gear; 42. cutter rod screw; 43. cutter rod chuck; 44. screw fixing pin; 45. first retaining ring; 46. second retaining ring; 50. cutter head; 51. cutter head rotating shaft; 52. rotating pin; 60. cutter rod; 601. cutter rod waist hole; 71. rotating active gear; 72. rotating passive gear; 73. rotating chuck; 74. connecting pin. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In this document, “upper”, “lower”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0034] See attached Figure 1-9 , an ultrasonic knife device with a retractable knife rod, comprising: a base 10, an instrument rod 20, an inner rod 21, a knife head 50, a knife rod 60, a knife head transmission mechanism, and a knife rod transmission mechanism; the instrument rod 20 is a hollow structure, one end of the instrument rod is located in the base 10, the inner rod 21 is movably arranged on the instrument rod 20, the inner rod 21 is a hollow structure, and the knife rod 60 is movably arranged in the inner rod 21; the knife head transmission mechanism is connected to the inner rod 21 and can drive the knife head 50 to open and close through the inner rod 21, and the knife rod transmission mechanism is used to drive the knife rod 60 to retract axially; the knife rod transmission mechanism includes a knife rod gear assembly and a knife rod screw 42, the knife rod screw 42 is fixedly connected to the knife rod 60, the knife rod gear assembly can drive the knife rod screw 42 to move axially, and the axial movement of the knife rod screw 42 drives the knife rod 60 to move axially, the knife rod gear assembly is arranged in the base 10 and the input end of the knife rod gear assembly is connected to the first input part, the first input part is fixed in the base 10 and is suitable for an external drive device.

[0035] The cutter head transmission mechanism includes a cutter head gear assembly and a cutter head screw 32. The cutter head gear assembly can drive the cutter head screw 32 to move axially. The cutter head gear assembly is arranged in the base 10 and the input end of the cutter head gear assembly is connected to the second input part. The second input part is fixed in the base 10 and is suitable for an external drive device.

[0036] The cutter head gear assembly includes a plurality of gears. Preferably, the cutter head gear assembly includes a cutter head active gear 311 and a cutter head passive gear 312 meshing with the cutter head active gear 311. The cutter head active gear 311 is connected to the second input part. The cutter head passive gear 312 is provided with an internal threaded hole in the middle. The thread of the internal threaded hole matches the cutter head screw 32. The second input part is a cutter head chuck 33. The cutter head chuck 33 is matched and installed with the cutter head active gear 311. The cutter head chuck 33 can be connected to an external surgical robot. The surgical robot can drive the cutter head chuck 33 to rotate. The rotation of the cutter head chuck 33 drives the cutter head active gear 311 to rotate synchronously. The rotation of the cutter head active gear 311 drives the cutter head passive gear 312 to rotate. The rotation of the cutter head passive gear 312 drives the cutter head screw 32 to move axially through the thread. The top end of the cutter head screw 32 is inserted into one end of the inner rod 21 for fixing. Preferably, the fixing method is welding. When the cutter head screw 32 moves axially, it drives the inner rod 21 to move up and down axially. The cutter head 50 is provided with two cutter head rotating shafts 51, which are respectively installed in two circular holes 211 correspondingly arranged on the circumference of the other end of the inner rod 21. In addition, a rotating pin 52 is also provided, which passes through two rotating pin holes correspondingly arranged on the circumference of one end of the instrument rod 20 and a cutter head through hole correspondingly arranged on the cutter head 50, and the cutter head 50 can rotate around the rotating pin 52. When the inner rod 21 moves axially, the cutter head 50 is driven to rotate around the rotating pin 52 through the cutter head rotating shaft 51, thereby realizing the closing and opening of the cutter head 50.

[0037] The tool bar gear assembly includes a plurality of gears. Preferably, the tool bar gear assembly includes a tool bar driving gear 411, a tool bar intermediate gear 412 and a tool bar passive gear 413. The tool bar driving gear 411 is installed in cooperation with the first input part. Preferably, the first input part is a tool bar chuck 43. The tool bar driving gear 411 is meshed with the tool bar intermediate gear 412, and the tool bar intermediate gear 412 is meshed with the tool bar passive gear 413. An internal threaded hole is provided in the middle of the tool bar passive gear 413, and the thread of the internal threaded hole is matched with the tool bar screw 42. The tool bar chuck 43 can be connected to an external surgical robot, and the surgical robot can drive the tool bar chuck 43 to rotate. The tool bar chuck 43 can drive the tool bar driving gear 411 to rotate synchronously. The rotation of the tool bar driving gear 411 drives the rotation of the tool bar intermediate gear 412. The rotation of the tool bar intermediate gear 412 drives the tool bar passive gear 413 to rotate. The rotation of the tool bar passive gear 413 drives the tool bar screw 42 to move axially through the thread. The knife rod screw 42 and the knife rod 60 are connected by the screw fixing pin 44. When the knife rod screw 42 moves axially, the knife rod 60 is synchronously driven to extend and retract axially. Figure 8 As shown, the extension state of the tool bar is Fig. 9When the knife bar is extended, it is used only as a cutting knife. When the knife bar is retracted, it can be used as a grasping forceps and a cutting knife. When the knife bar is extended, it extends forward for a distance, so that the knife head is far away from the tissue in the narrow operating space, and the knife head does not occupy the visual field. The high-frequency mechanical vibration of the knife bar is used to cut the tissue, which can reduce tissue damage and shorten the operation time. When the knife bar is retracted, the knife bar and the knife head work together to grasp and pull the tissue.

[0038] Furthermore, a middle bracket 11 is provided in the base 10, and the tool rod driving gear 411 passes through the base 10 and the middle bracket 11 and is limited by the first retaining ring 45. A tool rod rubber sleeve is provided on the tool rod 60, and a screw rod fixing pin rubber sleeve is provided on the screw rod fixing pin 44. The tool rod screw 42, the tool rod rubber sleeve and the tool rod are connected and fixed by the screw rod fixing pin 44, so when the tool rod driving gear 411 rotates, the tool rod 60 can be driven to move axially. The setting of the rubber sleeve can effectively eliminate the device damage caused by the rigid collision between the various components.

[0039] The ultrasonic knife device also includes a rotating assembly, which can drive the instrument rod 20, the inner rod 21 and the knife rod 60 to rotate. The rotating assembly includes a rotating active gear 71 and a rotating passive gear 72 meshing with the rotating active gear 71. The rotating passive gear 72 is a hollow structure. One end of the instrument rod 20 penetrates into the hollow structure of the rotating passive gear. The rotating passive gear 72 is provided with two rotating passive gear holes arranged oppositely along the circumference. The instrument rod 20 is provided with two instrument rod holes arranged oppositely along the circumference. The inner rod 21 and the knife rod 60 are respectively provided with inner rod waist-shaped holes 211 and knife rod waist-shaped holes 601 at corresponding positions. The connecting pin 74 passes through the two rotating passive gear holes, the two instrument rod holes, the inner rod waist-shaped holes 211, and the knife rod waist-shaped holes 601. The sizes of the inner rod waist-shaped holes 211 and the knife rod waist-shaped holes 601 are set so that the inner rod 21 and the knife rod 60 are not affected by the connecting pin during axial movement. The rotating active gear 71 is installed in cooperation with the third input part, which is fixed in the base 10 and is suitable for an external drive device. Preferably, the third input part is a rotating chuck 73, which can be externally connected to a surgical robot, and the surgical robot can drive the rotating chuck 73 to rotate, and the rotating chuck 73 can drive the rotating active gear 71 to rotate synchronously, and when the rotating active gear 71 rotates, it drives the rotating passive gear 72 to rotate, and when the rotating passive gear 72 rotates, it drives the instrument rod 20, the inner rod 21, and the knife rod 60 to rotate together. Due to the setting of the inner rod waist-shaped hole 211 and the knife rod waist-shaped hole 601, the connecting pin 74 does not limit the axial movement of the knife rod and the axial movement of the inner rod, and the axial movement of the knife rod and the axial movement of the inner rod are not affected by the connecting pin 74.

[0040] The base 10 and the middle bracket 11 are both provided with a cutter head chuck bearing, and the cutter head chuck 33 is fixed through the bearings on the base and the bracket. The cutter head chuck 33 can be sleeved with a second retaining ring 46 for limiting its axial movement, and the second retaining ring 46 is arranged on the middle bracket 11. It can prevent the cutter head chuck 33 from being offset and misaligned under the vibration of the driving device such as the motor, effectively improve the stability of the assembly of the cutter head chuck 33, and thus ensure the stability of the use of the ultrasonic knife; in addition, the rotating passive gear, the cutter head passive gear, and the cutter rod passive gear are all provided with one or two bearings, and the setting of the bearings can improve the smoothness of the rotation.

[0041] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the invention disclosed in the specification and examples. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present invention. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the claims.

[0042] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An ultrasonic knife device with a retractable knife rod, comprising: Base, instrument rod, inner rod, cutter head, cutter rod, cutter head transmission mechanism, cutter rod transmission mechanism; The instrument rod is a hollow structure, one end of the instrument rod is located in the base, the inner rod is movably arranged in the instrument rod, the inner rod is a hollow structure, and the knife rod is movably arranged in the inner rod; the knife head transmission mechanism is connected to the inner rod and can drive the knife head to open and close through the inner rod, and the knife rod transmission mechanism is used to drive the knife rod to axially extend and retract; the knife rod transmission mechanism includes a knife rod gear assembly and a knife rod screw, the knife rod screw is fixedly connected to the knife rod, the knife rod gear assembly can drive the knife rod screw to move axially, and the axial movement of the knife rod screw drives the axial movement of the knife rod, the knife rod gear assembly is arranged in the base and the input end of the knife rod gear assembly is connected to the first input part, the first input part is fixed in the base and is suitable for an external drive device.

2. The ultrasonic knife device with a retractable knife rod as claimed in claim 1, characterized in that: The cutter head transmission mechanism includes a cutter head gear assembly and a cutter head screw, the cutter head gear assembly can drive the cutter head screw to move axially, the cutter head gear assembly is arranged in the base and the input end of the cutter head gear assembly is connected to the second input part, the second input part is fixed in the base and is suitable for an external drive device; The cutter head gear assembly includes a cutter head driving gear and a cutter head passive gear meshing with the cutter head driving gear. The cutter head driving gear is connected to the second input part. An internal threaded hole is provided in the middle of the cutter head passive gear. The threads of the internal threaded hole cooperate with the cutter head lead screw.

3. The ultrasonic knife device with a retractable knife rod as claimed in claim 2, characterized in that: The top end of the cutter head screw is inserted into one end of the inner rod for fixation. When the cutter head screw moves axially, it drives the inner rod to move axially up and down. Two cutter head rotating shafts are arranged on the cutter head, and the two cutter head rotating shafts are respectively installed in two circular holes correspondingly arranged on the circumference of the other end of the inner rod; a rotating pin is also provided, and the rotating pin passes through the rotating pin hole correspondingly arranged on the circumference of one end of the instrument rod and the cutter head through hole correspondingly arranged on the cutter head, and the cutter head can rotate around the rotating pin.

4. The ultrasonic knife device with a retractable knife rod as claimed in claim 1, characterized in that: The tool rod gear assembly includes a tool rod driving gear, a tool rod intermediate gear and a tool rod passive gear. The tool rod driving gear is meshed with the tool rod intermediate gear, the tool rod intermediate gear is meshed with the tool rod passive gear, and the tool rod driving gear is installed in cooperation with the first input part; an internal threaded hole is provided in the middle of the tool rod passive gear, and the thread of the internal threaded hole is matched with the tool rod lead screw; the rotation of the tool rod driving gear drives the rotation of the tool rod intermediate gear, and the rotation of the tool rod intermediate gear drives the rotation of the tool rod passive gear, and the rotation of the tool rod passive gear drives the axial movement of the tool rod lead screw through the thread. When the tool rod lead screw moves axially, it synchronously drives the tool rod to axially extend and retract.

5. The ultrasonic knife device with a retractable knife rod as claimed in claim 2 or 3, characterized in that: The ultrasonic knife device also includes a rotating assembly, which can drive the instrument rod, the inner rod and the knife rod to rotate.

6. The ultrasonic knife device with a retractable knife rod as claimed in claim 5, characterized in that: The rotating assembly includes a rotating active gear and a rotating passive gear meshing with the rotating active gear. The rotating passive gear is a hollow structure. One end of the instrument rod is inserted into the hollow structure of the rotating passive gear. The rotating passive gear is provided with two rotating passive gear holes arranged opposite to each other along the circumference. The instrument rod is provided with two instrument rod holes arranged opposite to each other along the circumference. The inner rod waist-shaped hole and the knife rod waist-shaped hole are respectively provided at corresponding positions of the inner rod and the knife rod. The connecting pin passes through the two rotating passive gear holes, the two instrument rod holes, the inner rod waist-shaped hole, and the knife rod waist-shaped hole.

7. The ultrasonic knife device with a retractable knife rod as claimed in claim 6, characterized in that: The rotating driving gear is installed in cooperation with the third input part, and the third input part is fixed in the base and is suitable for connecting with an external driving device.

8. The ultrasonic knife device with a retractable knife rod as claimed in claim 7, characterized in that: The first input part is a tool bar chuck, the second input part is a tool head chuck, and the third input part is a rotary chuck.

9. The ultrasonic knife device with a retractable knife rod as claimed in claim 8, characterized in that: A middle-layer bracket is arranged in the base, and a cutter head chuck bearing is arranged in both the base and the middle-layer bracket, and the cutter head chuck is fixed through the bearing.

10. The ultrasonic knife device with a retractable knife rod as claimed in claim 9, characterized in that: The tool rod driving gear passes through the base and the middle bracket and is limited by the first retaining ring. The tool head chuck is sleeved with a second retaining ring for limiting its axial movement, and the second retaining ring is arranged on the middle bracket.

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