CN217447922U - Ultrasonic knife head - Google Patents
Ultrasonic knife head Download PDFInfo
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- CN217447922U CN217447922U CN202220229907.5U CN202220229907U CN217447922U CN 217447922 U CN217447922 U CN 217447922U CN 202220229907 U CN202220229907 U CN 202220229907U CN 217447922 U CN217447922 U CN 217447922U
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Abstract
The utility model discloses an ultrasonic scalpel head, including connecting gradually conical connecting portion, transition portion, cutting portion of formation, connecting portion and transition portion are cylindrically, the cutting portion is the slice that thickness reduces gradually from its tail end to its front end, the periphery side of cutting portion is provided with a set of sawtooth, the thickness of sawtooth is attenuate gradually along its extending direction, the first side of sawtooth with first contained angle alpha that forms between the axis of cutting portion be greater than its second side with the second contained angle beta that forms between the axis of cutting portion makes the sawtooth slope extends. The utility model discloses the periphery side at cutting portion sets up the frictional force when a set of sawtooth structure increases the cutting, improves cutting efficiency to do benefit to the accurate nature that improves the cutting location, the sawtooth is extended gradually by thick to thin, can reduce cutting bone loss volume and the sawtooth forms asymmetric structure, further improves cutting efficiency.
Description
Technical Field
The utility model relates to the technical field of medical equipment for orthopedic surgery, in particular to an ultrasonic scalpel bit for cutting bones.
Background
In bone surgery, an ultrasonic osteotome is used to cut, grind, shave or otherwise reshape bone. Traditional supersound osteotome knife tool bit cutting portion front end is the slice of thickness unanimity, and the tool bit receives pressure great during the osteotomy, and the structure of thickness unanimity makes to take place the jamming easily between cutting thin slice and the bone to pressure is great to equipment itself, and the easy disconnected sword phenomenon that takes place increases the operation risk. Or the front end slice of the cutting part of the cutter head of the traditional ultrasonic osteotome is designed to be thick to thin, and the contact part of the slice and a human body is thick, so that the traditional ultrasonic osteotome is difficult to cut, has low cutting efficiency, and can cause the increase of bone loss and influence the operation effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects existing in the prior art and providing an ultrasonic scalpel head.
The purpose of the utility model is realized through the following technical scheme:
ultrasonic knife tool bit, including connecting gradually tapered connecting portion, transition portion, cutting part of formation, connecting portion and transition portion are cylindrically, the cutting part is the slice that thickness reduces gradually from its tail end to its front end, the periphery side of cutting part is provided with a set of sawtooth, the thickness of sawtooth is attenuate gradually along its extending direction, the first side of sawtooth with first contained angle alpha that forms between the axis of cutting part be greater than its second side with the second contained angle beta that forms between the axis of cutting part makes the sawtooth is the slope extension with asymmetric structure.
Preferably, the periphery side of cutting portion is connected by first side, circular arc side and second side in proper order and is formed, interval between first side and the second side from both tail ends to the circular arc side reduces gradually, at least one in first side, circular arc side and the second side is provided with the sawtooth.
Preferably, the second included angle β is in the range of 20 ° to 100 ° and the difference between it and the first included angle α is between 50 ° and 60 °.
Preferably, grooves are formed in two end faces of the cutting portion between the peripheral side edges of the cutting portion, and the shape of each groove is consistent with that of the peripheral side edge.
Preferably, a width between an outer edge of the groove and an outer edge of the cutting part is between 0.2mm and 0.8 mm.
Preferably, the groove is provided with a group of flow channels along the edge of the groove, and the depth of the flow channels does not exceed the depth of the groove.
Preferably, the extending direction of the flow channel is identical to the extending direction of the saw teeth.
Preferably, one flow channel is arranged every three saw teeth.
Preferably, through grooves are formed between every two saw teeth, a third included angle epsilon is formed between the axis of each through groove and the end face of the cutting part in the thickness direction of the cutting part, and the angle range of the third included angle epsilon is 30-90 degrees.
Preferably, when the third included angle ≠ 90 °, the extending direction of the sawtooth on the first side edge is the same as or opposite to the extending direction of the sawtooth on the second side edge.
Preferably, the connecting part is provided with a key part.
The beneficial effects of the utility model are mainly embodied in that:
1. the side edge of the periphery of the cutting part is provided with a group of sawtooth structures to increase the friction force during cutting, improve the cutting efficiency and facilitate the improvement of the cutting positioning accuracy, and the sawteeth gradually extend from thick to thin, so that the loss of cutting bones can be reduced, the inclination angles of the first side and the second side of the sawteeth are inconsistent, and the sawteeth form an asymmetric structure to further improve the cutting efficiency;
2. the end face of the cutting part is provided with a groove, and the groove reduces the contact area between the cutting part and a bone during cutting, so that the bone loss is reduced, the quick recovery is facilitated, the friction is reduced, the cutting smoothness is improved, meanwhile, the pressure required by cutting of the cutting part can be reduced, and the fracture of the cutting part is avoided as much as possible;
3. the flow channel is arranged at the edge of the groove, so that cooling water in the groove can be accurately guided to the cutting part, the temperature of the cutting part is timely reduced, the damage to cell tissues of the cutting part is reduced, and the activity of the cell tissues is kept;
4. the peripheral side all sets up the sawtooth, satisfies the demand of the different cutting size of different cutting planes, makes its cutting that can satisfy different space size, different angles.
Drawings
The technical scheme of the utility model is further explained by combining the attached drawings as follows:
FIG. 1: schematic diagram of an embodiment of the present invention;
FIG. 2: the embodiment of the utility model discloses a part of the schematic diagram;
FIG. 3: the embodiment of the utility model discloses a part of the schematic diagram;
FIG. 4: the embodiment of the utility model discloses a side view;
FIG. 5: the embodiment of the utility model discloses a part of the schematic diagram;
FIG. 6: schematic view of a possible embodiment of the cutting part in an embodiment of the invention;
FIG. 7: schematic view of a possible embodiment of the cutting part in an embodiment of the invention;
FIG. 8: schematic view of a possible embodiment of the cutting part in an embodiment of the invention;
FIG. 9: schematic view of a possible embodiment of the cutting part in an embodiment of the invention;
FIG. 10: the embodiment of the utility model provides an in the total number of teeth of sawtooth along with the distribution diagram of second contained angle beta number of degrees change.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.
In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.
As shown in fig. 1 to 9, the utility model discloses an ultrasonic scalpel head, including connecting gradually and forming conical connecting portion 1, transition portion 3, cutting portion 4, connecting portion 1 and transition portion 3 are cylindrically, cutting portion 4 is the lamellar that thickness reduces gradually from its tail end to its front end, the periphery side of cutting portion 4 is provided with a set of sawtooth 41, the thickness of sawtooth 41 is attenuate gradually along its extending direction, first side 411 of sawtooth 41 with first contained angle alpha that forms between the axis of cutting portion 4 is greater than its second side 412 with the second contained angle beta that forms between the axis of cutting portion 4, makes sawtooth 41 does the slope with asymmetric structure and extends.
The peripheral side edge of the cutting part 4 is provided with a group of sawteeth 41 to increase the friction force during cutting, improve the cutting efficiency and facilitate the improvement of the cutting positioning accuracy, as shown in fig. 4, the ratio of the thinnest part thickness delta 1 of the sawteeth 41 to the thickest part thickness delta 2 of the sawteeth is 0.5-0.8, the thickest part thickness delta 2 is 0.7-1.2 mm, and the thickest part thickness delta 2 is not more than 1mm, preferably 0.8-1.0 mm. The structure arrangement enables the saw teeth 41 to extend gradually from thick to thin, the edges of the saw teeth are sharp, the cutting force is high, and the overall rigidity of the saw teeth can be increased due to the thick parts of the saw teeth, so that the saw teeth are not easy to break. And the saw teeth 41 are thinner as a whole, so that the cutting of the saw teeth generates smaller bone loss, which is beneficial to the later-stage rehabilitation of patients.
As shown in fig. 2, 3, 5, 6 and 7, the outer peripheral side of the cutting portion 4 is formed by connecting a first side 401, a circular arc side 402 and a second side 403 in this order, and the distance between the first side 401 and the second side 403 gradually decreases from the tail ends thereof toward the circular arc side 402, so that the outer peripheral side is tapered. The ratio between the maximum width L1 and the minimum width L2 of the first side edge 401 and the second side edge 403 is 0.5-0.8, preferably 0.6-0.7. The inclined arrangement of the first side wall 401 and the second side edge 403 enables the diameter of the cutting portion 4 to be varied to meet the cutting requirements of different cutting widths. In a preferred embodiment, the first side 401 and the second side 403 are symmetrically distributed with respect to the circular arc side 402, and in other possible embodiments, the first side 401 and the second side 403 may also be asymmetrically disposed, which is not limited herein.
As shown in fig. 6 and 7, the saw teeth 41 are provided on the outer peripheral side in various embodiments: the saw teeth 41 may be disposed on only one of the first side 401, the circular arc side 402, and the second side 403, the saw teeth 41 may be disposed on any two of the first side 401, the circular arc side 402, and the second side 403, or the saw teeth 41 may be disposed on all of the first side 401, the circular arc side 402, and the second side 403. In the preferred embodiment of the present invention, the saw teeth 41 are disposed on the first side 401, the arc side 402, and the second side 403 to meet the requirements of different cutting sizes as much as possible, so that the cutting device can meet the requirements of different space sizes and different angles, thereby improving the application range.
As shown in fig. 2 and 3, the second included angle β is in the range of 20 ° to 100 ° and differs from the first included angle α by 50 ° to 60 °, and the second included angle β is preferably 40 °. The inclined angles of the first side 411 and the second side 412 of the sawtooth 41 in the scheme are not consistent, so that the sawtooth 41 forms an asymmetric structure, the structure is more suitable for organizing the cutting direction, the sawtooth 41 is not easy to break during cutting, and the cutting fluency and efficiency are ensured.
The difference between the second included angle β and the first included angle α is the size of the gap angle between every two saw teeth 41, and when the difference is too large, the gap between the saw teeth 41 is too large, which reduces the cutting efficiency; when the difference is too small, the gaps between the saw teeth 41 are too small and the distribution is too tight, which increases the contact area between the saw teeth and the bone tissue, requires an increased pressure, and easily causes the saw teeth 41 to break. Fig. 10 is a graph showing the total number of teeth of the saw teeth 41 varying with the second included angle β degrees, with the vibration amplitude maintained, wherein the second included angle β is 60 °, which is distributed symmetrically.
As further shown in fig. 2 and 3, grooves 42 are formed on both end surfaces of the cutting portion 4 between the peripheral side edges thereof, and the shape of the grooves 42 is identical to that of the peripheral side edges, so that the cutting portion 4 has a uniform outer edge. The groove 42 is arranged to make the thickness of the cutting part 4 from the center to the outer edge become thinner and thicker, and the cutting part 4 at the position of the groove 42 is not clung to bone tissues during cutting, so that the contact area between the cutting part and the bone tissues is reduced, the friction force is reduced, the cutting efficiency is improved, and the bone loss is reduced. On the other hand, cooling water can circulate in the groove 42, so that the cooling water flows out of the cutting part in time and is cooled down in time, and the activity of the cell tissue at the cutting part is kept.
Wherein the width between the outer edge of the groove 42 and the outer edge of the cutting part 4 is 0.2 mm-0.8 mm, and the distance ensures that the cutting part 4 has enough rigidity to cut without generating a cutter blocking the smoothness of cutting.
Further, as shown in fig. 2, the groove 42 is provided with a set of flow channels 421 along the edge thereof, and the depth of the flow channels 421 does not exceed the depth of the groove 42. Further, the extending direction of the flow channel 421 is consistent with the extending direction of the saw teeth 41, so as to facilitate the cooling water flowing to the cutting part.
In the scheme, the flow channel 421 is arranged at every three sawteeth 41. The ratio between the number n of the saw teeth 41 and the number m of the flow passages 421 is 3: 1, and the ratio is obtained by the following calculation process:
first, heat generated when cutting the bone tissue is mainly generated by frictional heat generation between the saw teeth 41 and the bone tissue during vibration, and based on this, a model of heat generated per unit time of cutting the bone is established by different speeds when the tips of the saw teeth 41 vibrate, wherein stress heat inside the cutter is negligible.
Total heat generated per unit time by osteotomy: w2. mu.N.A m ·f，
Wherein A is m : the amplitude of the tip of the cutter head; f: the ultrasonic bone power system operating frequency; μ: the friction coefficient between the cutter head and the bone tissue; n: the cutting surface of the cutter head vertically presses the bone tissue.
The total heat generated by friction can increase the temperature of the bone tissue, the initial temperature of the bone tissue is the temperature of a human body, the maximum temperature is the maximum temperature allowed by the biological activity of the bone tissue, and the maximum allowed heat per unit time of the biological activity of the bone tissue is ensured as follows:
W 1 ＝c b m b (T 2 -T 1 )
wherein c is b : bone tissue specific heat capacity; m is b : participate in heat exchange bone tissue mass; t is 1 : the temperature of the human body; t is 2 : bone tissue maintains a bioactive maximal temperature.
If the heat generated by friction is far higher than the maximum allowable heat absorption of bone tissues, the residual heat needs cooling water to be absorbed, the allowable maximum temperature of the cooling water is the minimum temperature at which various human tissues contacted by the cooling water can keep biological activity, and the temperature is the maximum temperature at which the bone tissues can keep biological activity. The required volume of the cooling water can be obtained according to the heat consumption required by the cooling water, and then the flow of the cooling water is determined.
Calculating m according to the heat quantity taken away by cooling water in unit time w To save cooling water as much as possibleThe preparation is used.
ΔW＝W-W 1
ΔW＝c w m w (T 2 -T 0 )
Wherein: c. C w : specific heat capacity of physiological saline; m is w : minimal quality of saline is required for cooling; t is 0 : room temperature; t is 2 : bone tissue maintains a bioactive maximal temperature.
According to the calculated m w Determining the minimum volume of cooling water required per unit time, namely the cooling water flow rate V':
V′＝m w /ρ
wherein: ρ: the density of the physiological saline.
Considering that the cooling water is in a cavitation state when cutting operation is carried out, and the heat effect of the water in the cavitation state is lower than that of the water in a normal state, the actually required cooling water flow V is as follows:
V＝V′/A
wherein: a is a cavitation hydrothermal effect coefficient, and the coefficient is generally 70-80% according to relevant documents, and 75% is preferred in the embodiment.
The outside cover of cutting bone sword in this scheme is equipped with the protective sheath, and the cooling water space flows between protective sheath and cutter, can release at the protective sheath end, and flow velocity v when can obtain the cooling water according to the space sectional area and go out the protective sheath w ：
v w ＝V/ΔS
Wherein Δ S: the difference between the inner section of the protective sleeve at the position of the cooling water outlet and the sectional area of the cutter head.
As shown in fig. 2, due to the flow passage 421, the cooling water flows from the flow passage 421 to the saw teeth 41 to rapidly flow to the operation site, and flows downward by the weight g. Wherein the length Wh1 between the starting point and the end point of the runner 421 is Wh1 ═ g.t' 2 And/2, obtaining t'.
During the time t', the cooling water is according to v w Flow axially to the head end, travel distance Wh2 of Wh2 ═ v w T', the moving distance Wh2 is obtained.
According to the calculation result, the following results are obtained: wh 2: wh1 ≈ 3, namely, the ratio between the axial moving distance of the cooling water and the radial flowing distance thereof is 3, the width and the length of the single sawtooth 41 in the present scheme are equal to about 1: 1, therefore, the ratio between the number of the sawteeth 41 and the number of the flow passages 421 is 3: 1, namely, one flow passage 421 is arranged at every three sawteeth 41, the cooling requirement can be achieved by using the cooling water with the smallest volume, the use of the cooling water can be saved as much as possible, and the waste or the operation obstruction caused by the use of a large amount of the cooling water can be avoided.
Further, through grooves 413 are formed between every two saw teeth 41, in the thickness direction of the cutting part 4, a third included angle epsilon is formed between the axis of the through groove 413 and the end surface of the cutting part 4, and the angle range of the third included angle epsilon is 30-90 degrees, and is preferably 90 degrees.
When third contained angle epsilon ≠ 90, the extending direction of sawtooth 41 on first side 401 with the extending direction of sawtooth 41 of second side 403 is the same or further on the contrary, works as all be provided with on first side 401 and the second side 403 when sawtooth 41, the extending direction of sawtooth 41 on first side 401 with the extending direction of sawtooth 41 of second side 403 can syntropy set up or reverse setting, does not do the restriction here.
Further, the connecting portion 1 is provided with a key portion 2.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (11)
1. Ultrasonic knife tool bit, including connecting gradually and forming conical connecting portion (1), transition portion (3), cutting portion (4), its characterized in that: connecting portion (1) and transition portion (3) are cylindrically, cutting portion (4) are the slice that thickness reduces gradually from its tail end to its front end, the periphery side of cutting portion (4) is provided with a set of sawtooth (41), the thickness of sawtooth (41) is attenuate gradually along its extending direction, the first side (411) of sawtooth (41) with first contained angle alpha that forms between the axis of cutting portion (4) is greater than its second side (412) with the second contained angle beta that forms between the axis of cutting portion (4), make sawtooth (41) do the slope with asymmetric structure and extend.
2. The ultrasonic blade cartridge of claim 1, wherein: the periphery side of cutting portion (4) is connected the formation by first side (401), circular arc side (402) and second side (403) in proper order, interval between first side (401) and second side (403) from both tail ends to circular arc side (402) dwindles gradually, have at least one in first side (401), circular arc side (402) and second side (403) to be provided with sawtooth (41).
3. The ultrasonic blade cartridge of claim 2, wherein: the angle range of the second included angle beta is 20-100 degrees, and the difference value between the second included angle beta and the first included angle alpha is 50-60 degrees.
4. The ultrasonic blade cartridge of claim 3, wherein: grooves (42) are formed in two end faces, located between the peripheral side edges of the cutting portion (4), of the cutting portion, and the shapes of the grooves (42) are consistent with those of the peripheral side edges.
5. The ultrasonic blade bit of claim 4, wherein: the width between the outer edge of the groove (42) and the outer edge of the cutting part (4) is 0.2-0.8 mm.
6. The ultrasonic blade bit of claim 5, wherein: the groove (42) is provided with a group of flow channels (421) along the edge of the groove, and the depth of the flow channels (421) does not exceed the depth of the groove (42).
7. The ultrasonic blade bit of claim 6, wherein: the extending direction of the flow channel (421) is consistent with the extending direction of the saw teeth (41).
8. The ultrasonic blade cartridge of claim 7, wherein: and the flow channel (421) is arranged at intervals of three saw teeth (41).
9. The ultrasonic blade cartridge of claim 8, wherein: through grooves (413) are formed between every two saw teeth (41), a third included angle epsilon is formed between the axis of each through groove (413) and the end face of the cutting part (4) in the thickness direction of the cutting part (4), and the angle range of the third included angle epsilon is 30-90 degrees.
10. The ultrasonic blade cartridge of claim 9, wherein: when the third included angle epsilon ≠ 90 degrees, the extending direction of the sawtooth (41) on the first side edge (401) is the same as or opposite to the extending direction of the sawtooth (41) on the second side edge (403).
11. The ultrasonic blade cartridge of any one of claims 1-10, wherein: the connecting part (1) is provided with a wrench position part (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220229907.5U CN217447922U (en) | 2022-01-27 | 2022-01-27 | Ultrasonic knife head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220229907.5U CN217447922U (en) | 2022-01-27 | 2022-01-27 | Ultrasonic knife head |
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| CN217447922U true CN217447922U (en) | 2022-09-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142527A1 (en) * | 2022-01-27 | 2023-08-03 | 以诺康医疗科技（苏州）有限公司 | Ultrasonic scalpel head |
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- 2022-01-27 CN CN202220229907.5U patent/CN217447922U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023142527A1 (en) * | 2022-01-27 | 2023-08-03 | 以诺康医疗科技（苏州）有限公司 | Ultrasonic scalpel head |
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