GB2588797A - Surgical device and method of construction thereof - Google Patents

Surgical device and method of construction thereof Download PDF

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Publication number
GB2588797A
GB2588797A GB1916202.3A GB201916202A GB2588797A GB 2588797 A GB2588797 A GB 2588797A GB 201916202 A GB201916202 A GB 201916202A GB 2588797 A GB2588797 A GB 2588797A
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GB
United Kingdom
Prior art keywords
shaft
housing part
cavity
projection
shaft housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1916202.3A
Other versions
GB201916202D0 (en
GB2588797B (en
Inventor
Adrianus Petrus Maria Gommeren Wilhelmus
Mcaleer Liam
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Gyrus Medical Ltd
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Gyrus Medical Ltd
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Filing date
Publication date
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Priority to GB1916202.3A priority Critical patent/GB2588797B/en
Publication of GB201916202D0 publication Critical patent/GB201916202D0/en
Publication of GB2588797A publication Critical patent/GB2588797A/en
Application granted granted Critical
Publication of GB2588797B publication Critical patent/GB2588797B/en
Active legal-status Critical Current
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/148—Probes or electrodes therefor having a short, rigid shaft for accessing the inner body transcutaneously, e.g. for neurosurgery or arthroscopy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
    • A61B2017/00473—Distal part, e.g. tip or head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00526—Methods of manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00172—Connectors and adapters therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00577—Ablation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00589—Coagulation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00601—Cutting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00607—Coagulation and cutting with the same instrument
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/0091—Handpieces of the surgical instrument or device
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/0091—Handpieces of the surgical instrument or device
    • A61B2018/00916—Handpieces of the surgical instrument or device with means for switching or controlling the main function of the instrument or device
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/0091—Handpieces of the surgical instrument or device
    • A61B2018/00916—Handpieces of the surgical instrument or device with means for switching or controlling the main function of the instrument or device
    • A61B2018/00928—Handpieces of the surgical instrument or device with means for switching or controlling the main function of the instrument or device by sending a signal to an external energy source
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B2018/1405—Electrodes having a specific shape
    • A61B2018/144—Wire
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/08—Accessories or related features not otherwise provided for
    • A61B2090/0807—Indication means
    • A61B2090/0811—Indication means for the position of a particular part of an instrument with respect to the rest of the instrument, e.g. position of the anvil of a stapling instrument

Abstract

A surgical, preferably electrosurgical, instrument comprising a handpiece 220, a shaft 102 having a surgical end effector on the distal end thereof, and a shaft housing part 202. The shaft housing part has an axial bore channel formed therein into which a proximal end of the shaft is received, and a cavity 302 extending from a lateral surface of the shaft housing part into the interior thereof so as to encompass and extend beyond the axial bore channel. The handpiece has a projection 222 formed thereon which, when the instrument is assembled, projects into the cavity to an extent beyond the axial bore channel, a part of the shaft within the cavity being bent so as to be angled around the projection, thereby securing the shaft within the shaft housing part and permitting the shaft housing part to be received fully onto the handpiece. The shaft may either be bent into the cavity prior to the mounting of the shaft housing part to the handpiece, or may be bent by the action of mounting the shaft housing to the handpiece, the bending being affected through extension of the projection into the cavity.

Description

SURGICAL DEVICE AND METHOD OF CONSTRUCTION THEREOF
Technical Field
Embodiments of the present invention described herein relate to a surgical device and in particular an electrosurgical device, and more particularly to an electrosurgical device baying internal guide parts to permit more reliable assembly, and a method of construction of such an instrument.
Background to the Invention and Prior Art
Electrosurgical instruments provide advantages over traditional surgical instruments in that they can be used for coagulation and tissue sealing purposes. as well as for tissue cutting and ablation. Figure 1 shows a typical handheld electrosurgical instrument 10, comprising a cylindrical handpiece 104 having activation buttons 106 thereon. An instrument shaft 102 extends from the handpiece 104 axially in the long axial direction of the handpiece. At the end of the shaft is provided an end effector 108, which may be for example a suitably shaped electrode to obtain the intended tissue effect e.g. coagulation, ablation, cutting, when an appropriate electrosurgical RF waveform is applied thereto. Wiring to supply an RF signal to the end effector extends along the interior of the instrument shaft 102 from the handpiece 104, under the control of the user via the activation buttons 106. In this example, two activation buttons 106 are shown, which may be used respectively by the user to direct two different types of RF waveform to the end effector 108, for example a cutting waveform if one of the buttons is pressed, or a coagulation waveform if the other of the buttons is pressed. The RF waveform is generated by an electrosurgical generator 12, to which the handpiece 104 is connected via a power lead 110. The electrosurgical generator has a display 124 to display generator settings to the user, power level selection buttons 122, and mode selection (and other control) buttons 126.
In use the surgeon holds the handpiece 104 of the instrument to direct the end effector 108 against the tissue to be treated, and then activates the instrument to deliver a cutting, ablation, or coagulation waveform to the end effector from the generator 12 using the activation buttons 106. The waveform properties can be set on the generator in advance of use, and adjusted during use, using the buttons 122 and 126.
Electrosurgical instruments such as those described above are precision instruments, but for hygiene and operational reasons may be single use or of limited numbers of uses. The precision nature of their use therefore requires them to be reliably and accurately constructed, although the possibility of them being only used once or a limited number of times means that they need to be relatively easy and cheap to construct, else the cost of such instruments will be prohibitive. Manufacturing techniques that therefore increase the reliability and robustness of the manufactured instruments but without increasing the cost are therefore of much use in this field.
Summary of the Invention
Embodiments of the invention provide a surgical instrument and method of construction thereof, the surgical instrument comprising a shaft having a surgical end effector on the distal end thereof, the proximal end of the shaft extending into a handpiece of the instrument. To ensure that the shaft is held securely in the handpiece a bobbin shaped shaft housing part is provided having an axial hole therethrough into which the shaft is received, the shaft housing part also having a slot formed in its side wall and extending into the interior of the part to a greater extent than the depth of the axial hole such that the axial hole passes through the slot. The instrument handpiece has formed thereon a fin shaped projection that projects into the slot when the instrument is assembled, and projects greater than the depth of the axial hole. When assembling the device the shaft of the instrument must therefore be bent such that the part within the shall housing part is located off the axis of the axial hole and instead takes the shape of the slot in the shaft housing part. wherein the fin shaped projection can then extend fully into the slot, and the shaft housing part can be received fully into the handpiece. The fin shaped projection then aids in securing the shaft within the shaft housing part by abutting against the bent portion, whilst it can be visually seen that the shaft is secured by the fact that the shaft housing part is properly mounted on the handpiece and does not project therefrom.
In view of the above, there is provided a surgical instrument, comprising: a handpiece; a shaft having a surgical end effector on the distal end thereof; and a shaft housing part, the shaft housing part having an axial bore channel formed therein into which a proximal end of the shaft is received, and a cavity extending from a lateral surface of the shaft housing part into the interior thereof so as to encompass and extend beyond the axial bore channel; the handpiece further having a projection formed thereon which, when the instrument is assembled, projects into the cavity to an extent beyond the axial bore channel, a part of the shaft within the cavity being bent so as to be angled around the projection, thereby securing the shaft within shaft housing part and permitting the shaft housing part to be received fully onto the handpiece.
In one embodiment the projection and cavity are complementarily shaped so that the projection fits inside the cavity whilst leaving sufficient room for the shaft. In particular, in some embodiments the cavity comprises a slot formed in the side of the shall housing part extending into the interior thereof, and the projection comprises a correspondingly shaped fin upstanding from a base surface of the handpiece.
In addition, in some embodiments the depth of the cavity is at least the width of the shaft and the length of the projection. More particularly, the depth of the cavity is substantially equivalent to the width of the shaft and the length of the projection, whereby the shaft is held against an interior surface of the shaft housing part at the base of the cavity by an upper surface of the projection. Such an arrangement provides a secure fixing of the shaft.
In some embodiments the surgical instrument is an electrosurgical instrument, the end effector is an electrosurgical end effector, and the shaft contains electrical wires to supply electrosurgical signals to the end effector.
Another aspect of the present invention provides a method of constructing a surgical instrument, comprising: providing a handpiece having a projection formed thereon, a shaft having a surgical end effector on the distal end thereof; and a shaft housing part, the shaft housing part having an axial bore channel formed therein and a cavity extending from a lateral surface of the shaft housing part into the interior thereof so as to encompass and extend beyond the axial bore channel; inserting a proximal end of the shaft into the axial bore channel of the shaft housing part; and mounting the shaft housing part with the shaft therein onto the projection such that the projection is received into the cavity in the shaft housing part; wherein after the mounting the projection projects into the cavity to an extent beyond the axial bore channel, a part of the shaft within the cavity being bent so as to be angled around the projection, thereby securing the shaft within shaft housing part and permitting the shaft housing part to be received fully onto the handpiece.
This method has the advantages described previously that one can he assured that the shaft has been secured in the shaft housing part by being bent into the cavity therein, as otherwise it is not possible to properly mount the shaft housing part on to the projection. An easy visual check is therefore provided as to whether the shaft is properly secured to the handpiece.
In one embodiment the shaft is bent into the part of the cavity that extends beyond the axial bore channel prior to the mounting of the shaft housing part onto the projection.
In this respect, the shaft is bent into place using an appropriate tool. Alternatively, in another embodiment the shaft is bent into the part of the cavity that extends beyond the axial horn channel by the action of mounting the shaft housing part onto the projection, the projection acting to bend the shaft as the shaft housing part is mounted thereon. This alternative therefore requires fewer steps, although requires greater applied force as the insertion of the projection into the cavity also has to bend the shaft at the same time.
In one example the shaft is bent so as to rest against an interior surface of the shaft housing part at the base of the cavity. This can provide the advantage that the shaft can then be held between the projection on the handpiece and the interior surface, and thus be even more securely held in place.
In some embodiments the surgical instrument is an electrosurgical instrument, the end effector is an electrosurgical end effector, and the shaft contains electrical wires to supply electrosurgical signals to the end effector.
Brief Description of the Drawings
Embodiments of the invention will now be further described by way of example only and with reference to the accompanying drawings, wherein like reference numerals refer to like parts, and wherein: Figure 1 is a diagram of a handheld electrosurgical instrument; Figure 2 is a side view of a first embodiment of the present invention; Figure 3 is a bottom view of the first embodiment; Figure 4 is a zoomed in front view of the first embodiment; Figure 5 is a cross sectional view of the first embodiment in a first stage of construction; Figure 6 is a cross sectional view of the first embodiments in a second stage of construction: Figure 7 is a cross sectional view of the first embodiment in a third stage of construction: and Figures 8 and 9 are flow diagrams illustrating respective methods of construction of the first embodiment.
Overview of the Embodiments Embodiments of the present disclosure provide a method of making a surgical device having a handpiece from which a shaft axially extends, the shaft mounting on its distal end an end effector for the treatment of tissue when in use. To fasten the shaft to the handpiece the shaft extends through a shaft housing part which fits into an end of the handpiece both to seal the end thereof, and then hold the shaft securely, whilst also providing a seal through which the shaft extends to prevent liquid entering the interior of the handpiece. Where the surgical device is an RF electrosurgical device then wiring carrying the RF electrosurgical signal to the end effector is contained within the shaft, extending from within the interior of the handpiece to the end effector. The construction of the handpiece and the shaft housing part is such that the shaft is threaded through a hole provided in the center of the shaft housing part running axially through the part. The shall housing part is generally bobbin shaped to fit into the end of the generally cylindrical handpiece. but also contains a slot in its outer surface extending into the interior of the bobbin shape and encompassing the center axis of the bobbin, such that when the shaft is threaded through the shaft housing part it passes through the upper part of the slot. The handpiece is then provided with a fin shaped projection that is correspondingly shaped to the slot in the bobbin, such that when the device is being constructed, the bobbin shaped shaft housing part can be aligned with the handpiece by having the fin shaped projection project into the slot. That is, the bobbin is aligned with the handpiece such that the slot fits over the fin, and the fin projects up into the body of the bobbin. However, with the shaft inserted through the bobbin the shaft will prevent the fin being fully received into the slot, unless the shaft has been bent into shape to match the shape of the slot and fin.
The shaping of the shaft can be achieved by one of two means, either by applying force to the upper surface of the bobbin to force the shaft against the fin, which will in turn then bend the shaft around the fin such that the bobbin then fits into the handpiece, or by manually or machine bending the shaft to match the shape of the upper surface of the slot within the bobbin before placing the bobbin into the handpiece, and then placing the bobbin (which now contains the shaft bent to the shape of the inner slot) over the fin in the handpiece. In either case, the result is twofold, in that firstly the bobbin shaped shaft housing part will only fit properly within the handpiece if the shaft has been bent to fit the interior of the slot formed within the shaft housing part such that the fin on the handpiece can then he received therein (with the hent shaft then surrounding and tracing out the profile of the fin), and then secondly, the bent shape of the shaft with the fin then abutting against the shaft at the upper part of the slot ensures that the shaft is retained securely within the bobbin (and in turn within the handpiece) with no axial movement thereof, thus giving an accurate and robust construction.
Detailed Description of the Embodiments
In view of the above desciibed overview, a detailed description of an embodiment of the present disclosure will now be given. The present embodiment takes as its basis the handheld electrosurgical instrument 10 described previously with respect to Figure 1, but it should he understood that other embodiments need not be electrosurgical instruments, and the present disclosure may extend to the construction of other surgical instruments having a handpiece having a shaft projecting therefrom carrying a surgical end effector at its distal end.
With reference to Figures 2 to 9, a handpiece main chassis part 220 is provided, formed from plastic or some other insulating material. The handpiece main chassis 220 comprises a tubular shape having one side removed so as to open the tube at its upper surface at least partially along its length. That is, the tube has had a chord removed from one side so that the interior of the tube is open at least partially along its length. This chord shaped side walls 224 and 228 upstanding from the base of the tubular section. At one end of the main chassis 220 the upstanding chord shaped side walls 224 and 228 are removed, to provide a receiving section of the chassis 220 for a bobbin shaped shaft housing part 202. Within the receiving section of the chassis there is formed on the inner surface of the bottom wall a fin projection 222, that extends radially inward from the inner surface of the bottom wall of the tubular section, such that, as seen on Figure 4, the fin projects (upwardly) towards the center of the tubular section. The fin projection 222 is of a generally arrowhead shape, and has two angled upper surfaces 502 that together form the (blunt) arrowhead shape.
The bobbin shaped shaft housing part 202 is of generally cylindrical shape, but has triangular cross section shaped segments 204 formed in its outer surface on its upper side, the walls of which extend within the circumferential extent of the bobbin shape, such that the inner surfaces thereof help to form a slot shaped cavity 302 within the interior of the bobbin. The mouth of the slot shaped cavity 302 opens out on the underside of the bobbin shape (see Figure 3). The distal end of the bobbin shaped shaft housing part 202 has a circular shaped cap 112 on the distal end thereof, and the shaft housing part has a scaling structure 206, such as a rubber or plastic sealing ring, just axially proximal of the circular shaped cap 112.
As shown in Figures 5 to 7, the slot 302 extends into the interior of the bobbin shaped shaft housing part, extending past the axis of the bobbin, and has two angled interior surfaces 502 (see Figure 5) as its inner surfaces, furthest from the slot shaped opening. The two angled interior surfaces give the slot a generally arrowhead shaped profile, and are shaped so as to be complementary to the profile of the upwardly projecting fin portion 222 of the chassis 220. That is, the two angled interior surfaces 502 have the same angles as the upper angled surfaces 504 of the fin portion 222.
The depth of the slot 302 is such that when the fin portion 222 is fully received therein the portion 210 of the shaft 102 that is contained within the shaft housing part 202 is held tightly between the upper angled surfaces 504 and the angled interior surfaces 502, but without being crushed by the fin. That is, the slot 302 is deeper than the height of the fin portion 222 by the width of the portion 210 of the shaft 102, such that the shaft is forced to bend so as to extend around the fin portion and is then held between the fin portion 222 and the shaft housing 202. With such an arrangement the shaft is held tightly in place by the combination of the fin portion and the shaft housing, and cannot move axially at all. In addition, due to the shape of the arrangement an operator on an assembly line cannot fail to secure the shaft in place because the only way that the shaft housing 202 can be correctly placed into the chassis 220 is if the portion 210 of the shaft 102 that is within the shaft housing 202 is bent into shape so as to match the profile of the fin portion 222 and the interior surface of the slot 302. If the shaft is not bent thus, then the bobbin shaped shaft housing will not fit into the chassis, and will project outside the outer circumference thereof. It would not then be possible to place any outer finishing sleeve over the chassis, and the shaft housing could be visually seen as being out of alignment with the chassis.
The above described arrangement thus provides two possible modes of assembly, both of which achieve the objective of securing the shall 102 in place. Figure 8 illustrates a first example. where, in order to assemble the arrangement, at step 8.2 an assembly line operator first threads the shaft 102 (which includes within it wire 212, surrounded by sheathing 210) through the shaft housing 202, such that that shaft 102 is inserted through the circular shaped cap 112, and the sheathing 210 and the sheathed wire 212 extends through the shaft housing 202 in a substantially straight line, as shown in Figure 5. Next, in this example, the shaft 102, sheathing 210 and the sheathed wire 212 are then bent by the assembly line operator (or by an appropriate tool) against the interior surfaces 502 of the shaft housing 202, such that they line thereagainst, as shown in Figure 6. This step is performed at step 8.4. Then, the shaft housing with the bent shaft parts 210 and 212 is then pushed down at step 8.6 onto the fin projection 222, which is then received inside the slot 302 in the shaft housing 202, until the state where the shaft parts 210 and 212 are tightly held between the fin projection and the shaft housing 202 is attained, as shown in Figure 7. The resulting assembly is then ready to have an outer sleeve (not shown) then placed over the whole assembly to abut and seal against the cap 112.
In a slight alternative to the above, the shaft components 102, 210, and 212 can be bent into shape by a tool prior to being inserted into the shaft housing 202. This may require greater manipulation of the bent shaft components to thread them into the housing, but should still be possible for most degrees of bend, and may be operationally easier dependent on the precise tooling used to create the bent shaft components.
An alternative method to the above is shown in Figure 9. which does without step 8.4 where the operator or a machine bends the shaft components to match the profile of the slot 302 before the fin projection is inserted. Instead, in the alternative method of Figure 9, after the instrument shaft has been inserted through the shaft housing (s. 9.2), the shaft housing 202 is then pressed directly by the operator or machine onto the fin projection so that the shaft abuts against the projection (s.9.4), and then the press is continued to press the shaft housing into place, thereby at the same time bending the shaft components 210 and 212 so as to match the profile of the upper surfaces 504 of the fin projection 222 and the interior surfaces 502 of the shaft housing. In this alternative method, therefore, there is no need to bend the shaft elements 210 and 212 before placing the shaft housing over the fin, although greater force will be needed to push the housing onto the pin, as the same force is also needed to deform the shaft elements 210 and 212 at die same time.
In both cases, however, the arrangement of Figure 7 is obtained, with the shaft elements securely retained within the shaft housing in the handpiece, and certainty that this is so being visually certifiable by looking to see that the shaft housing is fully mounted on the chassis and does not project upwardly therefrom.
Various modifications whether by way of addition, deletion or substitution of features may be made to above described embodiment to provide further embodiments, any and all of which are intended to be encompassed by the appended claims.

Claims (11)

  1. Claims 1. A surgical instrument, comprising: a handpiece; a shaft having a surgical end effector on the distal end thereof; and a shaft housing pail, the shaft housing part having an axial bore channel formed therein into which a proximal end of the shaft is received, and a cavity extending from a lateral surface of the shaft housing part into the interior thereof so as to encompass and extend beyond the axial bore channel; the handpiece further having a projection formed thereon which, when the instrument is assembled, projects into the cavity to an extent beyond the axial bore channel, a part of the shaft within the cavity being bent so as to be angled around the projection, thereby securing the shaft within the shaft housing part and permitting the shaft housing part to be received fully onto the handpiece.
  2. 2. A surgical instrument according to claim 1, wherein the projection and cavity are complementarily shaped.
  3. 3. A surgical instrument according to claim 3, wherein the cavity comprises a slot formed in the side of the shaft housing part extending into the interior thereof, and the projections comprises a correspondingly shaped fin upstanding from a base surface of the handpiece.
  4. 4. A surgical instrument according to any of the preceding claims, wherein the depth of the cavity is at least the width of the shaft and the length of the projection.
  5. 5. A surgical instrument according to claim 4, wherein the depth of the cavity is substantially equivalent to the width of the shaft and the length of the projection, whereby the shaft is held against an interior surface of the shaft housing part at the base of the cavity by an upper surface of the projection.
  6. 6. A surgical instrument according to any of the preceding claims, wherein the surgical instrument is an electrosurgical instrument, the end effector is an electrosurgical end effector, and the shaft contains electrical wires to supply electrosurgical signals to the end effector.
  7. 7. A method of constructing a surgical instrument, comprising: providing a handpiece having a projection formed thereon, a shaft having a surgical end effector on the distal end thereof; and a shaft housing part, the shaft housing part having an axial bore channel formed therein and a cavity extending from a lateral surface of the shaft housing part into the interior thereof so as to encompass and extend beyond the axial bore channel; inserting a proximal end of the shaft into the axial bore channel of the shaft housing part; and mounting the shaft housing part with the shaft therein onto the projection such that the projection is received into the cavity in the shaft housing part; wherein after the mounting the projection projects into the cavity to an extent beyond the axial bore channel, a part of the shaft within the cavity being bent so as to be angled around the projection, thereby securing the shaft within shaft housing part and permitting the shaft housing part to be received fully onto the handpiece.
  8. 8. A method according to claim 7, wherein the shaft is bent into the part of the cavity that extends beyond the axial bore channel prior to the mounting of the shaft housing part onto the projection.
  9. 9. A method according to claim 7, wherein the shaft is bent into the part of the cavity that extends beyond the axial bore channel by the action of mounting the shaft housing part onto the projection, the projection acting to bend the shaft as the shaft housing part is mounted thereon.
  10. 10. A method according to claims 8 or 9, wherein the shaft is bent so as to rest against an interior surface of the shaft housing part at the base of the cavity.
  11. 11. A method according to any of claims 7 to 10, wherein the surgical instrument is an electrosureical instrument, the end effector is an electrosurgical end effector, and the shaft contains electrical wires to supply clectrosurgical signals to the end effector.
GB1916202.3A 2019-11-07 2019-11-07 Surgical device and method of construction thereof Active GB2588797B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1916202.3A GB2588797B (en) 2019-11-07 2019-11-07 Surgical device and method of construction thereof

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9023042B1 (en) * 2009-09-09 2015-05-05 Keith Huron Bipolar electrosurgical coagulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9023042B1 (en) * 2009-09-09 2015-05-05 Keith Huron Bipolar electrosurgical coagulator

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